WO2017126357A1 - 回路装置及び電力変換装置 - Google Patents
回路装置及び電力変換装置 Download PDFInfo
- Publication number
- WO2017126357A1 WO2017126357A1 PCT/JP2017/000403 JP2017000403W WO2017126357A1 WO 2017126357 A1 WO2017126357 A1 WO 2017126357A1 JP 2017000403 W JP2017000403 W JP 2017000403W WO 2017126357 A1 WO2017126357 A1 WO 2017126357A1
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- WIPO (PCT)
- Prior art keywords
- coil pattern
- heat transfer
- circuit device
- heat
- transfer members
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
- H05K1/0206—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate by printed thermal vias
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/165—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed inductors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/14—Mounting supporting structure in casing or on frame or rack
- H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
- H05K7/1427—Housings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
Definitions
- the present invention relates to a circuit device and a power conversion device.
- the power conversion device described in Patent Document 1 includes a circuit device including a printed circuit board provided with a coil pattern and a core made of ferrite.
- the core includes a first core portion and a second core portion.
- the coil pattern surrounds a part of the core. A part of the coil pattern is sandwiched between the first core part and the second core part.
- the coil pattern is formed of a thin conductor layer.
- An object of the present invention is to provide a circuit device and a power conversion device that can suppress a temperature rise in a portion of a coil pattern sandwiched between a first core portion and a second core portion.
- the circuit device and power conversion device of the present invention include a printed circuit board and a core.
- the printed circuit board has a first main surface and a second main surface opposite to the first main surface.
- the core includes a first core portion positioned on the first main surface and spaced from the first main surface, and a second core positioned on the second main surface and separated from the second main surface. Part.
- the core includes a through portion penetrating between the first main surface and the second main surface.
- the printed circuit board includes at least one of a first coil pattern disposed on the first main surface and a second coil pattern disposed on the second main surface. At least one of the first coil pattern and the second coil pattern surrounds the core penetration part by a half turn or more.
- the first coil pattern includes a first portion sandwiched between the first core portion and the second core portion, and the first core portion and the second core in a plan view from a direction perpendicular to the first main surface. And a second portion exposed from at least one of the core portions.
- the second coil pattern includes a third portion sandwiched between the first core portion and the second core portion, and the first core portion and the second portion in plan view from a direction perpendicular to the second main surface. And a fourth portion exposed from at least one of the core portions.
- the first heat transfer member is disposed on at least one of the first portion and the third portion.
- the circuit device and power converter of the present invention include a first heat transfer member on at least one of the first part and the third part.
- the first heat transfer member is attached to at least one of the first portion and the third portion.
- the first heat transfer member is larger than at least one of the first portion and the third portion. Has an area.
- the first heat transfer member includes the first portion and the cross section that intersects the direction in which the current of at least one of the first coil pattern and the second coil pattern flows. It has a larger cross-sectional area than at least one of the third portions. Therefore, the first heat transfer member has lower electrical resistance and lower thermal resistance than at least one of the first part and the third part. Heat generated in at least one of the first part and the third part can be reduced. Furthermore, the heat generated in at least one of the first part and the third part can be dissipated to the outside of the circuit device with a low thermal resistance. According to the circuit device and the power conversion device of the present invention, a temperature increase in at least one of the first portion and the third portion can be suppressed.
- FIG. 1 It is a circuit diagram of the power converter device concerning Embodiment 1 of the present invention. It is a schematic perspective view of the power converter device which concerns on Embodiment 1 of this invention. 1 is a schematic perspective view of a circuit device according to Embodiment 1 of the present invention. It is a coil connection diagram of the circuit device according to the first embodiment of the present invention. 1 is a schematic plan view of a circuit device according to a first embodiment of the present invention. 6 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line VI-VI shown in FIG. FIG.
- FIG. 7 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line VII-VII shown in FIG. 6.
- FIG. 7 is a schematic sectional view of the circuit device according to the first embodiment of the present invention taken along a sectional line VIII-VIII shown in FIG. 7 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line IX-IX shown in FIG. 7 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line XX shown in FIG.
- FIG. 7 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line XI-XI shown in FIG. 7 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line XII-XII shown in FIG.
- FIG. 6 is a schematic cross-sectional view of the circuit device according to the first embodiment of the present invention taken along a cross-sectional line XIII-XIII shown in FIG. It is a general
- FIG. 18 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XVIII-XVIII shown in FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XIX-XIX shown in FIG. FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XX-XX shown in FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXI-XXI shown in FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXII-XXII shown in FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXIII-XXIII shown in FIG.
- FIG. 19 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXIV-XXIV shown in FIG.
- FIG. 18 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXV-XXV shown in FIG.
- FIG. 18 is a schematic cross-sectional view of the circuit device according to Embodiment 2 of the present invention taken along a cross-sectional line XXVI-XXVI shown in FIG. It is a schematic plan view of the circuit device concerning Embodiment 3 of the present invention.
- FIG. 18 is a schematic cross-sectional view of the circuit device according to the second embodiment of the present invention taken along a cross-sectional line XXIV-XXIV shown in FIG.
- FIG. 18 is a schematic cross-sectional view of the circuit device according to Embodiment 2 of the present invention taken along a cross-sectional line X
- FIG. 28 is a schematic sectional view of the circuit device according to the third embodiment of the present invention taken along a sectional line XXVIII-XXVIII shown in FIG. 27.
- FIG. 29 is a schematic cross-sectional view of the circuit device according to Embodiment 3 of the present invention taken along a cross-sectional line XXIX-XXIX shown in FIG.
- FIG. 29 is a schematic cross-sectional view of the circuit device according to the third embodiment of the present invention taken along a cross-sectional line XXX-XXX shown in FIG.
- FIG. 29 is a schematic cross-sectional view of the circuit device according to the third embodiment of the present invention taken along a cross-sectional line XXI-XXI shown in FIG.
- FIG. 29 is a schematic cross sectional view of the circuit device according to the third embodiment of the present invention taken along a cross sectional line XXXII-XXXII shown in FIG. 28.
- FIG. 29 is a schematic cross sectional view of the circuit device according to the third embodiment of the present invention taken along a cross sectional line XXXIII-XXXIII shown in FIG. 28.
- FIG. 29 is a schematic sectional view taken along a sectional line XXXIV-XXXIV shown in FIG. 28 of the circuit device according to the third embodiment of the present invention.
- FIG. 28 is a schematic cross-sectional view of the circuit device according to the third embodiment of the present invention taken along a cross-sectional line XXXV-XXXV shown in FIG. 27.
- FIG. 28 is a schematic cross sectional view of the circuit device according to the third embodiment of the present invention taken along a cross sectional line XXXVI-XXXVI shown in FIG. 27.
- FIG. 28 is a schematic cross-sectional view of the circuit device according to Embodiment 3 of the present invention taken along a cross-sectional line XXXVII-XXXVII shown in FIG. 27. It is a schematic plan view of the circuit device concerning Embodiment 4 of this invention.
- FIG. 39 is a schematic sectional view of the circuit device according to the fourth embodiment of the present invention taken along a sectional line XXXIX-XXXIX shown in FIG. 38.
- FIG. 39 is a schematic sectional view of the circuit device according to the fourth embodiment of the present invention taken along a sectional line XXXIX-XXXIX shown in FIG. 38.
- FIG. 40 is a schematic cross sectional view of the circuit device according to the fourth embodiment of the present invention taken along a cross sectional line XL-XL shown in FIG. 39.
- FIG. 40 is a schematic sectional view taken along a sectional line XLI-XLI shown in FIG. 39 of the circuit device according to the fourth embodiment of the present invention.
- FIG. 40 is a schematic cross sectional view of the circuit device according to the fourth embodiment of the present invention taken along a cross sectional line XLII-XLII shown in FIG. 39.
- FIG. 40 is a schematic cross sectional view of the circuit device according to the fourth embodiment of the present invention taken along a cross sectional line XLIII-XLIII shown in FIG. 39.
- FIG. 46 is a schematic sectional view taken along a sectional line XLVI-XLVI shown in FIG. 45 of the circuit device according to the fifth embodiment of the present invention.
- FIG. 47 is a schematic sectional view taken along a sectional line XLVII-XLVII shown in FIG. 46 of the circuit device according to the fifth embodiment of the present invention.
- FIG. 47 is a schematic cross sectional view of the circuit device according to the fifth embodiment of the present invention taken along a cross sectional line XLVIII-XLVIII shown in FIG. 46.
- FIG. 47 is a schematic sectional view taken along a sectional line XLIX-XLIX shown in FIG. 46 of the circuit device according to the fifth embodiment of the present invention.
- FIG. 47 is a schematic sectional view of the circuit device according to the fifth embodiment of the present invention taken along a sectional line LL shown in FIG. 46.
- FIG. 47 is a schematic cross sectional view of the circuit device according to the fifth embodiment of the present invention taken along a cross sectional line LI-LI shown in FIG. 46.
- FIG. 47 is a schematic cross sectional view of the circuit device according to Embodiment 5 of the present invention taken along a cross sectional line LII-LII shown in FIG. 46.
- FIG. 46 is a schematic cross sectional view taken along a cross sectional line LIII-LIII shown in FIG. 45 of the circuit device according to Embodiment 5 of the present invention.
- FIG. 46 is a schematic cross sectional view of the circuit device according to the fifth embodiment of the present invention taken along a cross sectional line LIV-LIV shown in FIG. 45.
- It is a coil connection diagram of the circuit device according to the sixth embodiment of the present invention.
- It is a schematic plan view of the circuit device concerning Embodiment 6 of this invention.
- FIG. 57 is a schematic cross sectional view of the circuit device according to the sixth embodiment of the present invention taken along a cross sectional line LVII-LVII shown in FIG. 56.
- FIG. 58 is a schematic cross sectional view taken along a cross sectional line LVIII-LVIII shown in FIG. 57 of the circuit device according to Embodiment 6 of the present invention.
- FIG. 58 is a schematic cross sectional view of the circuit device according to Embodiment 6 of the present invention taken along a cross sectional line LIX-LIX shown in FIG. 57.
- FIG. 58 is a schematic cross sectional view of the circuit device according to Embodiment 6 of the present invention taken along a cross sectional line LX-LX shown in FIG. 57.
- FIG. 58 is a schematic cross sectional view of the circuit device according to the sixth embodiment of the present invention taken along a cross sectional line LXI-LXI shown in FIG. 57.
- FIG. 58 is a schematic cross sectional view of the circuit device according to Embodiment 6 of the present invention taken along a cross sectional line LXII-LXII shown in FIG. 57.
- FIG. 58 is a schematic cross sectional view taken along a cross sectional line LXIII-LXIII shown in FIG. 57 of the circuit device according to Embodiment 6 of the present invention.
- FIG. 57 is a schematic cross sectional view taken along a cross sectional line LXIV-LXIV shown in FIG. 56 of the circuit device according to Embodiment 6 of the present invention.
- FIG. 57 is a schematic sectional view of the circuit device according to the sixth embodiment of the present invention taken along a sectional line LXV-LXV shown in FIG. 56.
- FIG. 68 is a schematic cross sectional view taken along a cross sectional line LXVIII-LXVIII shown in FIG. 67 of the circuit device according to Embodiment 7 of the present invention.
- FIG. 68 is a schematic sectional view taken along a sectional line LXIX-LXIX shown in FIG. 67 of the circuit device according to the seventh embodiment of the present invention.
- It is a coil connection diagram of the circuit device according to the eighth embodiment of the present invention. It is a schematic plan view of a circuit device according to an eighth embodiment of the present invention.
- FIG. 72 is a schematic cross sectional view taken along a cross sectional line LXXII-LXXII shown in FIG. 71 of the circuit device according to Embodiment 8 of the present invention.
- FIG. 73 is a schematic cross sectional view taken along a cross sectional line LXXIII-LXXIII shown in FIG. 72 of the circuit device according to Embodiment 8 of the present invention.
- FIG. 73 is a schematic cross sectional view taken along a cross sectional line LXXIV-LXXIV shown in FIG. 72 of the circuit device according to Embodiment 8 of the present invention.
- FIG. 73 is a schematic cross sectional view taken along a cross sectional line LXXV-LXXV shown in FIG.
- FIG. 73 is a schematic cross sectional view taken along a cross sectional line LXXVI-LXXVI shown in FIG. 72 of the circuit device according to Embodiment 8 of the present invention.
- FIG. 72 is a schematic cross sectional view taken along a cross sectional line LXXVII-LXXVII shown in FIG. 71 of the circuit device according to Embodiment 8 of the present invention.
- It is a coil connection diagram of the circuit device according to the ninth embodiment of the present invention.
- It is a schematic plan view of a circuit device according to Embodiment 9 of the present invention.
- FIG. 73 is a schematic cross sectional view taken along a cross sectional line LXXVI-LXXVI shown in FIG. 72 of the circuit device according to Embodiment 8 of the present invention.
- FIG. 72 is a schematic cross sectional view taken along a cross sectional line LXXVII-LXXVII shown in FIG. 71 of the circuit device according to Embodiment 8
- FIG. 80 is a schematic cross sectional view taken along a cross sectional line LXXX-LXXX shown in FIG. 79 of the circuit device according to Embodiment 9 of the present invention.
- FIG. 90 is a schematic cross sectional view of the circuit device according to Embodiment 9 of the present invention taken along a cross sectional line LXXXI-LXXXI shown in FIG. 80.
- FIG. 91 is a schematic cross sectional view taken along a cross sectional line LXXXII-LXXXII shown in FIG. 80, of the circuit device according to Embodiment 9 of the present invention.
- FIG. 80 is a schematic cross sectional view taken along a cross sectional line LXXIII-LXXXIII shown in FIG.
- FIG. 85 is a schematic cross sectional view of the circuit device according to Embodiment 10 of the present invention taken along a cross sectional line LXXXV-LXXXV shown in FIG. 84.
- FIG. 85 is a schematic cross sectional view taken along a cross sectional line LXXXVI-LXXXVI shown in FIG. 84 of the circuit device according to Embodiment 10 of the present invention. It is a schematic plan view of the circuit device concerning Embodiment 11 of this invention.
- FIG. 87 is a schematic cross sectional view taken along a cross sectional line LXXXVIII-LXXXVIII shown in FIG. 87 of the circuit device according to Embodiment 11 of the present invention.
- FIG. 87 is a schematic cross sectional view taken along a cross sectional line LXXXIX-LXXXIX shown in FIG. 87 of the circuit device according to Embodiment 11 of the present invention.
- FIG. 87 is a schematic cross sectional view taken along a cross sectional line XC-XC shown in FIG. 87 of the circuit device according to Embodiment 11 of the present invention.
- FIG. It is a schematic plan view of the circuit device concerning Embodiment 12 of this invention.
- FIG. 12 is a schematic cross sectional view taken along a cross sectional line LXXXVIII-LXXXVIII shown in FIG. 87 of the circuit device according to Embodiment 11 of the present invention.
- FIG. 87 is a schematic cross
- FIG. 92 is a schematic cross sectional view taken along a cross sectional line XCII-XCII shown in FIG. 91 of the circuit device according to Embodiment 12 of the present invention.
- FIG. 92 is a schematic cross sectional view taken along a cross sectional line XCIII-XCIII shown in FIG. 91 of a circuit device according to Embodiment 12 of the present invention.
- FIG. 92 is a schematic cross sectional view taken along a cross sectional line XCIV-XCIV shown in FIG. 91 of the circuit device according to Embodiment 12 of the present invention. It is a schematic plan view of a circuit device according to Embodiment 13 of the present invention.
- FIG. 13 is a schematic cross sectional view taken along a cross sectional line XCII-XCII shown in FIG. 91 of the circuit device according to Embodiment 12 of the present invention.
- FIG. 96 is a schematic cross sectional view taken along a cross sectional line XCVI-XCVI shown in FIG. 95 of the circuit device according to Embodiment 13 of the present invention.
- FIG. 96 is a schematic cross sectional view taken along a cross sectional line XCVII-XCVII shown in FIG. 95 of the circuit device according to Embodiment 13 of the present invention.
- Embodiment 1 FIG. With reference to FIG. 1, an example of a circuit configuration of the power conversion device 1 of the present embodiment will be described.
- the power conversion device 1 of the present embodiment may be a DC-DC converter for automobiles.
- the power conversion device 1 is connected to the input terminal 10, the inverter circuit 11 connected to the input terminal 10, the transformer 19 connected to the inverter circuit 11, the rectifier circuit 14 connected to the transformer 19, and the rectifier circuit 14. And a smoothing circuit 16 and an output terminal 20 connected to the smoothing circuit 16.
- the inverter circuit 11 includes primary side switching elements 12A, 12B, 12C, and 12D.
- the transformer 19 includes a primary side coil conductor 19A connected to the inverter circuit 11, and a secondary side coil conductor 19B magnetically coupled to the primary side coil conductor 19A.
- the secondary coil conductor 19 ⁇ / b> B is connected to the rectifier circuit 14.
- the rectifier circuit 14 includes secondary side switching elements 15A, 15B, 15C, 15D.
- the smoothing circuit 16 includes a smoothing coil 17 and a capacitor 18.
- the primary side switching elements 12A, 12B, 12C, 12D and the secondary side switching elements 15A, 15B, 15C, 15D are, for example, MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), IGBTs (Insulated Gate Bipolar Transistors), or diodes. Such a rectifying element may be used.
- the power conversion device 1 of the present embodiment converts, for example, a DC voltage of about 100 V to about 600 V input to the input terminal 10 into a DC voltage of about 12 V to about 16 V, and outputs it from the output terminal 20. Also good. Specifically, a high DC voltage input to the input terminal 10 is converted into a first AC voltage by the inverter circuit 11. The first AC voltage is converted by the transformer 19 into a second AC voltage that is lower than the first AC voltage. The second AC voltage is rectified by the rectifier circuit 14. The smoothing circuit 16 smoothes the voltage output from the rectifier circuit 14 and outputs a low DC voltage to the output terminal 20.
- the input terminal 10, the primary side switching elements 12A, 12B, 12C, and 12D, the transformer 19, the secondary side switching elements 15A, 15B, 15C, and 15D, the smoothing coil 17, the capacitor 18, and the output terminal 20 are mounted on the printed circuit board 40.
- region containing the smoothing coil 17 among the power converter devices 1 may be the circuit apparatus 30 of this Embodiment.
- the printed circuit board 40 is mounted on the radiator 6.
- the radiator 6 may constitute a part of the housing that accommodates the printed circuit board 40 or may not constitute a part of the housing.
- the power conversion device 1 including the circuit device 30 may be covered with a lid (not shown) that constitutes a part of a housing that houses the printed circuit board 40.
- the circuit device 30 of the present embodiment will be described with reference to FIGS.
- the circuit device 30 according to the present embodiment mainly includes a printed circuit board 40 and a core 45.
- the printed circuit board 40 includes at least one of the first coil pattern 50 and the second coil pattern 55.
- the circuit device 30 of the present embodiment mainly includes at least one of the first heat transfer members 70 and 71 and the first heat transfer members 73 and 74.
- the circuit device 30 according to the present embodiment may further include a third coil pattern 60, a radiator 6, and second heat transfer members 80 and 80a.
- the printed circuit board 40 may further include thermal vias 81, 82, 83a, 83b, 84a, and 84b.
- the printed circuit board 40 has a first main surface 40a and a second main surface 40b opposite to the first main surface 40a.
- the printed circuit board 40 may be a multilayer circuit board including multilayer coil patterns (a first coil pattern 50, a second coil pattern 55, a first internal coil pattern 61, and a second internal coil pattern 65).
- the printed circuit board 40 has a four-layer coil pattern composed of the first coil pattern 50, the first internal coil pattern 61, the second internal coil pattern 65, and the second coil pattern 55. Are stacked.
- the printed circuit board 40 is a four-layer board.
- the printed circuit board 40 may be a glass epoxy substrate such as an FR-4 substrate.
- the printed circuit board 40 may include a first base material layer 40c, a second base material layer 40d, and a third base material layer 40e.
- the first base material layer 40c may be thinner than the second base material layer 40d.
- the printed circuit board 40 (first base material) between the first internal coil pattern 61 and the first coil pattern 50 is formed.
- the thermal resistance of layer 40c) can be reduced.
- the third base material layer 40e may be thinner than the second base material layer 40d.
- the printed circuit board 40 (third base material) between the second internal coil pattern 65 and the second coil pattern 55 is formed. The thermal resistance of layer 40e) can be reduced.
- the printed circuit board 40 may include a first through hole 41, a second through hole 42, and a third through hole 43 that pass through between the first main surface 40a and the second main surface 40b. Good.
- the first through hole 41 receives the first leg portion 47 a of the second core portion 47.
- the second through hole 42 receives the second leg portion 47 b of the second core portion 47.
- the third through hole 43 receives the third leg portion 47 c of the second core portion 47.
- the printed circuit board 40 may have holes 40h, 40i, 40j, and 40k that pass through between the first main surface 40a and the second main surface 40b.
- the hole 40h receives the attachment member 77a.
- the hole 40i receives the attachment member 77b.
- the hole 40j receives the attachment member 77c.
- the hole 40k receives the attachment member 77d.
- the core 45 includes a first core part 46 and a second core part 47.
- the first core portion 46 is located on the first main surface 40a of the printed circuit board 40 away from the first main surface 40a.
- the second core portion 47 is located on the second main surface 40b of the printed circuit board 40 away from the second main surface 40b. A part of the printed circuit board 40 is sandwiched between the first core part 46 and the second core part 47.
- the first core portion 46 is fitted into the first recess 6 e of the radiator 6.
- the second core part 47 may be disposed on the first core part 46.
- the core 45 may be an EI type core.
- the first core portion 46 may have an I shape
- the second core portion 47 may have an E shape.
- the core 45 may be EE type, U type, EER type, or ER type.
- the 1st core part 46 and the 2nd core part 47 may be comprised with a ferrite, and may be comprised with magnetic materials other than a ferrite.
- the second core portion 47 may include a first leg portion 47a, a second leg portion 47b, and a third leg portion 47c.
- the second leg 47b may be located between the first leg 47a and the third leg 47c.
- the first leg portion 47a of the second core portion 47 may penetrate the first through hole 41 from the second main surface 40b side.
- the second leg portion 47b of the second core portion 47 may penetrate the second through hole 42 from the second main surface 40b side.
- the third leg portion 47c of the second core portion 47 may penetrate the third through hole 43 from the second main surface 40b side.
- the core 45 includes a through portion (47b) penetrating between the first main surface 40a and the second main surface 40b.
- the penetrating portion (47b) of the core 45 may be the second leg portion 47b of the second core portion 47.
- the first leg portion 47 a and the third leg portion 47 c of the second core portion 47 may be in contact with the main surface of the first core portion 46.
- the second leg portion 47 b of the second core portion 47 may be in contact with the main surface of the first core portion 46.
- the second leg 47b may have the same length as the first leg 47a and the third leg 47c, or a shorter length than the first leg 47a and the third leg 47c. You may have.
- the first coil pattern 50 is disposed on the first main surface 40 a of the printed board 40.
- the first coil pattern 50 is formed of a thin conductor layer having a thickness of about 100 ⁇ m.
- the first coil pattern 50 is a material having a lower electrical resistivity and lower thermal resistivity than the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. Composed.
- the first coil pattern 50 may be made of copper, for example.
- the first coil pattern 50 surrounds a part of the core 45. Specifically, the first coil pattern 50 surrounds the through portion (47b) of the core 45.
- the fact that the first coil pattern 50 surrounds the through portion (47b) of the core 45 means that the first coil pattern 50 is wound around the through portion (47b) of the core 45 by more than a half turn. To do. In the present embodiment, the first coil pattern 50 is wound around the through portion (47b) of the core 45 for about one turn.
- the first coil pattern 50 includes a first portion 51 sandwiched between the first core portion 46 and the second core portion 47.
- the first coil pattern 50 includes a second portion 52 exposed from at least one of the first core portion 46 and the second core portion 47 in a plan view from a direction perpendicular to the first main surface 40a.
- the second portion 52 of the first coil pattern 50 may be exposed from the first core portion 46 and the second core portion 47 in a plan view from a direction perpendicular to the first main surface 40a.
- the second portion 52 of the first coil pattern 50 may be a portion that is not sandwiched between the first core portion 46 and the second core portion 47.
- the second coil pattern 55 is disposed on the second main surface 40 b of the printed circuit board 40.
- the second coil pattern 55 is formed of a thin conductor layer having a thickness of about 100 ⁇ m.
- the second coil pattern 55 is a material having a lower electrical resistivity and lower thermal resistivity than the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. Composed.
- the second coil pattern 55 may be made of copper, for example.
- the second coil pattern 55 surrounds a part of the core 45. Specifically, the second coil pattern 55 surrounds the through portion (47b) of the core 45.
- the fact that the second coil pattern 55 surrounds the through portion (47b) of the core 45 means that the second coil pattern 55 is wound around the through portion (47b) of the core 45 by more than a half turn. To do.
- the second coil pattern 55 is wound around the through portion (47b) of the core 45 for about one turn. At least a part of the second coil pattern 55 may overlap the first coil pattern 50 in a plan view from a direction perpendicular to the first main surface 40 a of the printed circuit board 40.
- the second coil pattern 55 includes a third portion 56 sandwiched between the first core portion 46 and the second core portion 47.
- the second coil pattern 55 includes a fourth portion 57 exposed from at least one of the first core portion 46 and the second core portion 47 in plan view from a direction perpendicular to the second main surface 40b. .
- the fourth portion 57 of the second coil pattern 55 may be exposed from the first core portion 46 and the second core portion 47 in a plan view from a direction perpendicular to the second main surface 40b.
- the fourth portion 57 of the second coil pattern 55 may be a portion that is not sandwiched between the first core portion 46 and the second core portion 47.
- the third coil pattern 60 may be disposed inside the printed circuit board 40.
- the third coil pattern 60 may be configured by a plurality of coil patterns (a first internal coil pattern 61 and a second internal coil pattern 65) stacked on each other.
- the third coil pattern 60 may include a first internal coil pattern 61 and a second internal coil pattern 65.
- the first inner coil pattern 61 and the second inner coil pattern 65 are formed of a thin conductor layer having a thickness of about 100 ⁇ m.
- the first internal coil pattern 61 and the second internal coil pattern 65 are lower in electrical resistivity than the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. And a material having a low thermal resistivity.
- the first internal coil pattern 61 and the second internal coil pattern 65 may be made of copper, for example.
- each of the first internal coil pattern 61 and the second internal coil pattern 65 constituting the third coil pattern 60 surrounds a part of the core 45. Specifically, each of the first internal coil pattern 61 and the second internal coil pattern 65 constituting the third coil pattern 60 surrounds the through portion (47b) of the core 45.
- the fact that each of the first internal coil pattern 61 and the second internal coil pattern 65 surrounds the through portion (47b) of the core 45 means that each of the first internal coil pattern 61 and the second internal coil pattern 65 is It means that the core 45 is wound around the through portion (47b) by more than a half turn.
- each of the first internal coil pattern 61 and the second internal coil pattern 65 is wound around the through portion (47b) of the core 45 for about one turn.
- the third coil pattern 60 may overlap with the first coil pattern 50 and the second coil pattern 55.
- the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60 may be stacked on each other.
- the first heat transfer members 70 and 71 are disposed on the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 may be attached to the first portion 51 of the first coil pattern 50 using solder or a conductive adhesive.
- the first heat transfer members 70 and 71 may have a rectangular parallelepiped shape.
- the first heat transfer members 70 and 71 may be attached to the first portion 51 of the first coil pattern 50 using solder or a conductive adhesive at both ends and the center thereof.
- the first heat transfer members 70 and 71 are electrically and thermally connected to the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 have lower electrical resistance and thermal resistance than the first portion 51 of the first coil pattern 50.
- the electrical resistance of the first heat transfer members 70 and 71 is less than or equal to one-half, preferably less than or equal to one-fifth, more preferably ten minutes, of the first section 51 of the first coil pattern 50. It may be 1 or less.
- the thermal resistance of the first heat transfer members 70 and 71 is 1/2 or less, preferably 1/5 or less, more preferably 10 minutes of the thermal resistance of the first portion 51 of the first coil pattern 50. It may be 1 or less.
- the first heat transfer members 70 and 71 may be made of a metal such as copper or a copper alloy, and may have a rectangular parallelepiped shape.
- the first heat transfer members 70 and 71 may have a larger cross-sectional area than the first portion 51 of the first coil pattern 50 in the cross section orthogonal to the longitudinal direction of the first coil pattern 50.
- the longitudinal direction of the first coil pattern 50 means a direction in which a current flows in the first coil pattern 50.
- the cross-sectional area of the first heat transfer members 70 and 71 may be 2 times or more, preferably 5 times or more, more preferably 10 times or more of the cross-sectional area of the first portion 51 of the first coil pattern 50. Good.
- the first heat transfer members 70 and 71 may be equal to or smaller than the width of the first coil pattern 50 (the length of the first coil pattern 50 in the short direction).
- the width of the first heat transfer members 70 and 71 may be 30% or more, preferably 50% or more, more preferably 70% or more of the width of the first portion 51 of the first coil pattern 50.
- the first heat transfer member 70 may be disposed between the thermal via 81 and the thermal via 84a.
- the first heat transfer member 71 may be disposed between the thermal via 82 and the thermal via 84b.
- the first heat transfer members 70 and 71 may be accommodated in the first recess 6 e of the radiator 6.
- the first heat transfer members 73 and 74 are disposed on the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 may be attached to the third portion 56 of the second coil pattern 55 using solder or a conductive adhesive.
- the first heat transfer members 73 and 74 may have a rectangular parallelepiped shape.
- the first heat transfer members 73 and 74 may be attached to the third portion 56 of the second coil pattern 55 by using solder or a conductive adhesive at both ends and a central portion thereof.
- the first heat transfer members 73 and 74 are electrically and thermally connected to the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 have lower electrical resistance and thermal resistance than the third portion 56 of the second coil pattern 55.
- the electrical resistance of the first heat transfer members 73 and 74 is less than or equal to one-half, preferably less than or equal to one-fifth, more preferably ten-minutes, of the third section 56 of the second coil pattern 55. It may be 1 or less.
- the thermal resistance of the first heat transfer members 73 and 74 is 1/2 or less, preferably 1/5 or less, more preferably 10 minutes of the thermal resistance of the third portion 56 of the second coil pattern 55. It may be 1 or less.
- the first heat transfer members 73 and 74 may be made of a metal such as copper or a copper alloy, and may have a rectangular parallelepiped shape.
- the first heat transfer members 73 and 74 may have a larger cross-sectional area than the third portion 56 of the second coil pattern 55 in the cross section that intersects the longitudinal direction of the second coil pattern 55.
- the cross-sectional area of the first heat transfer members 73 and 74 is 2 times or more, preferably 5 times or more, more preferably 10 times or more of the cross-sectional area of the third portion 56 of the second coil pattern 55. Good.
- the first heat transfer members 73 and 74 may be equal to or smaller than the width of the second coil pattern 55 (the length of the second coil pattern 55 in the short direction).
- the widths of the first heat transfer members 73 and 74 may be 30% or more, preferably 50% or more, more preferably 70% or more of the width of the third portion 56 of the second coil pattern 55.
- the first heat transfer member 73 may be disposed between the thermal via 81 and the thermal via 84a.
- the first heat transfer member 74 may be disposed between the thermal via 82 and the thermal via 84b.
- the first heat transfer members 70, 71, 73, 74 may be made of a metal such as copper or a copper alloy, or carbon.
- the first heat transfer members 70, 71, 73, 74 may be composed of a member having high electrical conductivity, high thermal conductivity, and high rigidity, such as a copper plate.
- the first heat transfer members 70, 71, 73, and 74 may have a thermal conductivity of 60 W / (m ⁇ K) or more.
- the first heat transfer members 70, 71, 73, and 74 may have an electrical resistivity of 7 ⁇ 10 ⁇ 8 ⁇ ⁇ m or less.
- the first heat transfer members 70, 71, 73, and 74 may have a coating film made of enamel or polyurethane on the surface thereof.
- the coating film made of enamel or polyurethane protects the first heat transfer members 70, 71, 73 and 74. A part of this coating film is removed, and then the first heat transfer members 70 and 71 are soldered to the first coil pattern 50, and the first heat transfer members 73 and 74 are connected to the second coil pattern 55. It may be soldered to.
- the first heat transfer members 70, 71, 73, and 74 may be separated from the core 45 and the radiator 6, and may be electrically insulated from the core 45 and the radiator 6.
- the circuit device 30 may include the radiator 6.
- the radiator 6 may be thermally connected to the first coil pattern 50.
- the radiator 6 may be made of a metal material such as iron, aluminum, an iron alloy, or an aluminum alloy.
- the radiator 6 may be preferably made of a high heat conductive material such as aluminum or an aluminum alloy.
- the radiator 6 is thermally connected to the first coil pattern 50.
- the second heat transfer members 80 and 80 a are in surface contact with the first coil pattern 50.
- the radiator 6 is in surface contact with the second heat transfer members 80 and 80a.
- the radiator 6 is connected to the first coil pattern 50 with a low thermal resistance via the second heat transfer members 80 and 80a.
- the radiator 6 may be in direct contact with the first coil pattern 50.
- the heat radiator 6 may be thermally connected to the second coil pattern 55 and the third coil pattern 60.
- the thermal vias 81, 82, 83a, 83b, 84a, and 84b thermally connect the second coil pattern 55 and the third coil pattern 60 to the second heat transfer members 80 and 80a.
- the radiator 6 is in surface contact with the second heat transfer members 80 and 80a.
- the radiator 6 is lower than the second coil pattern 55 and the third coil pattern 60 via the thermal vias 81, 82, 83a, 83b, 84a, 84b and the second heat transfer members 80, 80a. You may connect by thermal resistance.
- the printed circuit board 40 may be attached to the radiator 6 using attachment members 77a, 77b, 77c, and 77d.
- the radiator 6 may include convex portions 6a, 6b, 6c, and 6d.
- the convex portions 6 a, 6 b, 6 c, and 6 d can ensure electrical insulation between the portion of the printed board 40 where the convex portions 6 a, 6 b, 6 c, and 6 d are not disposed and the radiator 6.
- the convex portions 6a, 6b, 6c, and 6d may have holes that receive the attachment members 77a, 77b, 77c, and 77d, respectively.
- the attachment members 77a, 77b, 77c, and 77d may be received in the holes of the convex portions 6a, 6b, 6c, and 6d, respectively, through the holes 40h, 40i, 40j, and 40k of the printed circuit board 40.
- the mounting members 77a, 77b, 77c, and 77d may be screws or rivets, for example.
- the attachment members 77 a and 77 b may be disposed along the longitudinal direction of the second heat transfer member 80 so as to sandwich the second heat transfer member 80.
- the attachment members 77a and 77b may be arranged along the longitudinal direction of the first coil pattern 50 so as to sandwich the second portion 52 of the first coil pattern 50.
- the attachment members 77 a and 77 b may be arranged along the longitudinal direction of the first coil pattern 50 so as to sandwich the central portion in the longitudinal direction of the first coil pattern 50.
- the attachment member 77a may be disposed adjacent to the thermal via 84a.
- the attachment member 77b may be disposed adjacent to the thermal via 84b.
- the mounting members 77c and 77d may be arranged along the longitudinal direction of the second heat transfer member 80a so as to sandwich the second heat transfer member 80a.
- the attachment member 77 c may be disposed adjacent to the thermal via 81.
- the attachment member 77 c may be disposed adjacent to one end of the first coil pattern 50.
- the attachment member 77 c may be disposed adjacent to one end of the second coil pattern 55.
- the attachment member 77d may be disposed adjacent to the thermal via 82.
- the attachment member 77d may be disposed adjacent to the other end of the first coil pattern 50.
- the attachment member 77d may be disposed adjacent to the other end of the second coil pattern 55.
- the shortest distance between the mounting members 77a, 77b, 77c, and 77d and each of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60 is 0.5 mm or more and 1.0 mm or less. There may be.
- the attachment members 77a, 77b, 77c, and 77d are separated from the first coil pattern 50, the second coil pattern 55, the third coil pattern 60, and the first heat transfer members 70, 71, 73, and 74.
- the first coil pattern 50, the second coil pattern 55, the third coil pattern 60, and the first heat transfer members 70, 71, 73, 74 may be electrically insulated.
- the circuit device 30 of the present embodiment includes a second heat transfer member having electrical insulation between the radiator 6 and the first coil pattern 50.
- 80, 80a may be provided.
- the second heat transfer members 80, 80 a may be in surface contact with the radiator 6 and the second portion 52 of the first coil pattern 50.
- the second heat transfer members 80 and 80 a electrically insulate the second portion 52 of the first coil pattern 50 exposed from the core 45 from the radiator 6.
- the second heat transfer members 80, 80 a transfer the heat generated in the first coil pattern 50 to the radiator 6 with a low thermal resistance.
- the second heat transfer members 80 and 80a have a thermal conductivity higher than that of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40.
- the thermal conductivity of the second heat transfer members 80 and 80a is preferably that of the thermal conductivity of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. It may be 2 times or more, more preferably 4 times or more.
- the second heat transfer members 80 and 80 a may be crushed by the printed board 40.
- the second heat transfer members 80 and 80a crushed by the printed circuit board 40 have an even lower thermal resistance.
- the second heat transfer members 80 and 80a may be silicone rubber sheets.
- the second heat transfer member 80 may extend along the longitudinal direction of the first coil pattern 50 on the second portion 52 of the first coil pattern 50.
- the second portion 52 of the first coil pattern 50 where the second heat transfer member 80 is disposed may be a central portion in the longitudinal direction of the first coil pattern 50.
- the second heat transfer member 80 may be located between the attachment member 77a and the attachment member 77b.
- the second heat transfer member 80a may extend so as to connect both ends of the first coil pattern 50 where the thermal vias 81 and 82 are located.
- the second heat transfer member 80a may be positioned between the attachment member 77c and the attachment member 77d.
- printed circuit board 40 may include thermal vias 81, 82, 83 a, 83 b, 84 a, and 84 b.
- the thermal vias 81, 82, 83 a, 83 b, 84 a, and 84 b have a thermal conductivity larger than that of the first base material layer 40 c, the second base material layer 40 d, and the third base material layer 40 e of the printed board 40.
- thermal via 81 includes a through hole 81h penetrating between first main surface 40a and second main surface 40b of printed circuit board 40, and a heat transfer film on the surface of through hole 81h. 81c.
- thermal via 81 includes a through hole 81h penetrating between first main surface 40a and second main surface 40b of printed circuit board 40, and heat transfer body 81c1 filling through hole 81h. And may be included.
- the heat transfer film 81c and the heat transfer body 81c1 have a larger thermal conductivity than the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40.
- the heat transfer film 81c and the heat transfer body 81c1 may further have electrical conductivity.
- the heat transfer film 81c and the heat transfer body 81c1 may be made of copper, for example.
- Each of the thermal vias 82, 83 a, 83 b, 84 a and 84 b may have the same configuration as the thermal via 81.
- the thermal vias 83 a and 83 b are arranged in a region sandwiched between the first core portion 46 and the second core portion 47 in the printed circuit board 40.
- the thermal vias 83a and 83b penetrate between the first main surface 40a and the second main surface 40b of the printed circuit board 40, and the first portion 51 of the first coil pattern 50, the second coil pattern.
- the thermal vias 83a and 83b may have electrical conductivity or electrical insulation.
- the thermal vias 83a and 83b include the first core portion 46 and the second one of the first portion 51 of the first coil pattern 50, the third portion 56 of the second coil pattern 55 and the third coil pattern 60.
- the portion sandwiched between the core portions 47 may be electrically connected.
- the thermal vias 81 and 82 are arranged in a region exposed from at least one of the first core portion 46 and the second core portion 47 in the printed circuit board 40.
- the thermal vias 81 and 82 may be arranged in regions exposed from the first core part 46 and the second core part 47 in the printed circuit board 40.
- the thermal via 81 may be disposed adjacent to one end of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60.
- the thermal via 82 may be disposed adjacent to the other end of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60.
- the thermal vias 81 and 82 penetrate between the first main surface 40a and the second main surface 40b of the printed circuit board 40, the second portion 52 of the first coil pattern 50, the second coil pattern. Of the 55 fourth portion 57 and the third coil pattern 60, the portion not sandwiched between the first core portion 46 and the second core portion 47 is thermally connected.
- the thermal vias 81 and 82 have electrical conductivity.
- the thermal vias 81 and 82 include the first core portion 46 and the second portion of the second portion 52 of the first coil pattern 50, the fourth portion 57 of the second coil pattern 55, and the third coil pattern 60. The portions not sandwiched between the core portions 47 are electrically connected.
- the thermal vias 84 a and 84 b are arranged in a region exposed from at least one of the first core portion 46 and the second core portion 47 in the printed circuit board 40.
- the thermal vias 84 a and 84 b may be arranged in regions exposed from the first core part 46 and the second core part 47 in the printed circuit board 40.
- the thermal via 84 a may be disposed at one end of the central portion of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60.
- the thermal via 84 b may be disposed at the other end of the central portion of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60.
- the thermal vias 84a and 84b penetrate between the first main surface 40a and the second main surface 40b of the printed circuit board 40, the second portion 52 of the first coil pattern 50, the second coil pattern. Of the 55 fourth portion 57 and the third coil pattern 60, the portion not sandwiched between the first core portion 46 and the second core portion 47 is thermally connected.
- the thermal vias 84a and 84b may have electrical conductivity or electrical insulation.
- the thermal vias 84 a and 84 b include the first core portion 46 and the second of the second portion 52 of the first coil pattern 50, the fourth portion 57 of the second coil pattern 55, and the third coil pattern 60. A portion not sandwiched between the core portions 47 may be electrically connected.
- each of thermal vias 81 and 82 has electrical conductivity. Therefore, the first coil pattern 50, the first internal coil pattern 61, the second internal coil pattern 65, and the second coil pattern 55 are electrically connected in parallel to each other by the thermal vias 81 and 82.
- the coil pattern (the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60) has a circuit configuration of one turn and four parallel connections.
- Each of the thermal vias 83a, 83b, 84a, 84b may have electrical conductivity.
- the first coil pattern 50, the first internal coil pattern 61, the second internal coil pattern 65, and the second coil pattern 55 are electrically connected in parallel to each other by thermal vias 83a, 83b, 84a, and 84b. Also good.
- the first heat transfer members 70, 71, 73, 74 may be arranged so as to overlap the thermal vias 83a, 83b.
- the first heat transfer members 70, 71, 73, 74 are attached to the first coil pattern 50 and the second coil pattern 55 by reflow soldering, part of the solder is filled in the thermal vias 83a, 83b. Also good.
- the solder filled in the thermal vias 83a and 83b together with the heat transfer films included in the thermal vias 83a and 83b, the first portion 51 of the first coil pattern 50, and the third portion 56 of the second coil pattern 55 The heat generated in the first internal coil pattern 61 and the second internal coil pattern 65 can be dissipated. Therefore, temperature rises of the first portion 51 of the first coil pattern 50, the third portion 56 of the second coil pattern 55, the first internal coil pattern 61, and the second internal coil pattern 65 can be suppressed.
- a part of the solder may be filled also in any subsequent thermal via disposed so as to overlap with any subsequent heat transfer member in plan view of the first main surface 40a and the second main surface 40b. .
- a plurality of coil patterns (first coil pattern 50, second coil pattern 55, third coil pattern 60) having substantially the same pattern shape are stacked.
- the thermal vias 81 and 82 are electrically connected to all of the plurality of coil patterns (the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60). In this way, a circuit configuration is obtained in which a plurality of coil patterns (first coil pattern 50, second coil pattern 55, and third coil pattern 60) are electrically connected in parallel to each other.
- the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is suppressed.
- the first heat transfer members 70 and 71 are disposed on the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 are electrically connected to the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 In the cross section that intersects the direction in which the current of the first coil pattern 50 flows, the first heat transfer members 70 and 71 have, for example, a larger cross-sectional area than the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 have a lower electrical resistance than the first portion 51 of the first coil pattern 50.
- the electric resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 is lower than the electric resistance of the first coil pattern 50.
- the first heat transfer members 70 and 71 are made of the same material as the first coil pattern 50, have the same width as the first coil pattern 50, and the first heat transfer members 70 and 71
- the electrical resistance of the portion composed of both the first heat transfer members 70 and 71 and the first portion 51 of the first coil pattern 50 is The electrical resistance of the first portion 51 of the first coil pattern 50 is less than 1/10.
- the first heat transfer members 70 and 71 are arranged on the first portion 51 of the first coil pattern 50, the first core portion 46 and the second core portion 47 are sandwiched between the first core portion 46 and the second core portion 47. Heat generated in the first portion 51 of the first coil pattern 50 and the first heat transfer members 70 and 71 can be reduced. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the first heat transfer members 70 and 71 are disposed on the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 are thermally connected to the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 In the cross section that intersects the direction in which the current of the first coil pattern 50 flows, the first heat transfer members 70 and 71 have, for example, a larger cross-sectional area than the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 have a lower thermal resistance than the first portion 51 of the first coil pattern 50.
- the thermal resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 is lower than the thermal resistance of the first coil pattern 50.
- the first heat transfer members 70 and 71 are made of the same material as the first coil pattern 50, have the same width as the first coil pattern 50, and the first heat transfer members 70 and 71
- the thermal resistance of the portion composed of both the first heat transfer members 70 and 71 and the first portion 51 of the first coil pattern 50 is The thermal resistance of the first portion 51 of the first coil pattern 50 is less than 1/10.
- the heat generated in the first portion 51 of the first coil pattern 50 is It is difficult to accumulate in the first portion 51 of the first coil pattern 50 and the first heat transfer members 70 and 71, and is spread on the second portion 52 of the first coil pattern 50 with low thermal resistance.
- first heat transfer members 70 and 71 on the first portion 51 of the first coil pattern 50 may have a larger surface area than the first portion 51 of the first coil pattern 50.
- the first heat transfer members 70 and 71 on the first portion 51 of the first coil pattern 50 generate heat generated in the first portion 51 of the first coil pattern 50 by the first coil pattern 50.
- the second portion 52 can be spread with a low thermal resistance. Therefore, the heat generated in the first portion 51 of the first coil pattern 50 is the ambient atmosphere from the surface of the first heat transfer members 70 and 71 and the surface of the second portion 52 of the first coil pattern 50. To be dissipated.
- the first heat transfer members 70 and 71 are electrically and thermally applied to the first portion 51 of the first coil pattern 50.
- the electrical resistance and thermal resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 are smaller than the electrical resistance and thermal resistance of the first coil pattern 50. Become. Therefore, the heat generated in the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be reduced.
- the heat generated in the first portion 51 of the first coil pattern 50 is unlikely to accumulate in the first portion 51 of the first coil pattern 50 and the first heat transfer members 70 and 71, and The first coil pattern 50 is spread on the second portion 52 with a low thermal resistance. Therefore, according to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47. The rise can be suppressed.
- the paths for dissipating the heat generated in the first portion 51 of the first coil pattern 50 to the surrounding atmosphere are the surfaces of the first heat transfer members 70 and 71 and the first coil pattern 50 described above.
- the second heat radiation path includes the first coil pattern 50, the second heat transfer members 80 and 80 a, and the heat radiator 6. Due to the first heat transfer members 70 and 71, the heat generated in the first portion 51 of the first coil pattern 50 is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6.
- this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the heat generated in the first portion 51 of the first coil pattern 50 is dissipated into the surrounding atmosphere through the plurality of heat dissipation paths.
- the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is suppressed.
- the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is suppressed.
- the first heat transfer members 73 and 74 are disposed on the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 are electrically connected to the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 In the cross section that intersects the direction in which the current of the second coil pattern 55 flows, the first heat transfer members 73 and 74 have, for example, a larger cross-sectional area than the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 have a lower electrical resistance than the third portion 56 of the second coil pattern 55.
- the electric resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 is lower than the electric resistance of the second coil pattern 55.
- the first heat transfer members 73 and 74 are made of the same material as the second coil pattern 55, have the same width as the second coil pattern 55, and the first heat transfer members 73 and 74 are the first heat transfer members 73 and 74.
- the thickness of the second coil pattern 55 is 10 times the thickness
- the electric resistance of the portion composed of both the first heat transfer members 73 and 74 and the third portion 56 of the second coil pattern 55 is The electrical resistance of the third portion 56 of the second coil pattern 55 is less than 1/10.
- the first heat transfer members 73 and 74 are arranged on the third portion 56 of the second coil pattern 55, the first core portion 46 and the second core portion 47 are sandwiched between the first core portion 46 and the second core portion 47.
- the heat generated in the third portion 56 of the second coil pattern 55 and the first heat transfer members 73 and 74 can be reduced.
- the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the first heat transfer members 73 and 74 are disposed on the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 are thermally connected to the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 In the cross section that intersects the direction in which the current of the second coil pattern 55 flows, the first heat transfer members 73 and 74 have, for example, a larger cross-sectional area than the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 have a lower thermal resistance than the third portion 56 of the second coil pattern 55.
- the thermal resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 is lower than the thermal resistance of the second coil pattern 55.
- the first heat transfer members 73 and 74 are made of the same material as the second coil pattern 55, have the same width as the second coil pattern 55, and the first heat transfer members 73 and 74 are the first heat transfer members 73 and 74.
- the thermal resistance of the portion consisting of both the first heat transfer members 73 and 74 and the third portion 56 of the second coil pattern 55 is It is less than 1/10 of the thermal resistance of the third portion 56 of the second coil pattern 55.
- the heat generated in the third portion 56 of the second coil pattern 55 is reduced by The second coil pattern 55 is less likely to accumulate in the third portion 56 of the second coil pattern 55 and the first heat transfer members 73 and 74, and is spread on the fourth portion 57 of the second coil pattern 55 with low thermal resistance.
- first heat transfer members 73 and 74 on the third portion 56 of the second coil pattern 55 may have a larger surface area than the third portion 56 of the second coil pattern 55.
- the first heat transfer members 73 and 74 on the third portion 56 of the second coil pattern 55 generate heat generated in the third portion 56 of the second coil pattern 55 by the second coil pattern 55.
- the fourth portion 57 can be spread with a low thermal resistance. Therefore, the heat generated in the third portion 56 of the second coil pattern 55 is the ambient atmosphere from the surface of the first heat transfer members 73 and 74 and the surface of the fourth portion 57 of the second coil pattern 55. To be dissipated.
- the first heat transfer members 73 and 74 are electrically and thermally connected to the third portion 56 of the second coil pattern 55.
- the electrical resistance and thermal resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 are smaller than the electrical resistance and thermal resistance of the second coil pattern 55. Become. Therefore, heat generated in the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be reduced.
- the heat generated in the third portion 56 of the second coil pattern 55 is unlikely to accumulate in the third portion 56 of the second coil pattern 55 and the first heat transfer members 73 and 74, and The second coil pattern 55 is spread on the fourth portion 57 with a low thermal resistance. Therefore, according to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47. The rise can be suppressed.
- the path for dissipating the heat generated in the third portion 56 of the second coil pattern 55 to the surrounding atmosphere is the surface of the first heat transfer members 73 and 74 and the fourth portion 57 of the second coil pattern 55.
- the following second and third heat radiation paths are included.
- the second heat radiation path includes the second coil pattern 55, the thermal vias 81, 82, 83 a, 83 b, 84 a, 84 b, the first coil pattern 50, the second heat transfer members 80, 80 a, and the radiator 6. . Due to the first heat transfer members 73 and 74, the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance. This heat is transmitted to the first coil pattern 50 through the thermal vias 81, 82, 83a, 83b, 84a, 84b. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat radiation path includes the second coil pattern 55, the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first coil pattern 50, and the first heat transfer members 70, 71. Due to the first heat transfer members 73 and 74, the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance. This heat is transmitted to the first coil pattern 50 through the thermal vias 81, 82, 83a, 83b, 84a, 84b. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, the heat generated in the third portion 56 of the second coil pattern 55 is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the heat generated in the third portion 56 of the second coil pattern 55 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths.
- the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the electrical resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 is smaller than the electrical resistance of the first coil pattern 50.
- the electric resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 is smaller than the electric resistance of the second coil pattern 55. Therefore, the electrical resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 and the electrical resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55.
- the resistance is smaller than the electric resistance of the first internal coil pattern 61.
- the first coil pattern 50, the first internal coil pattern 61, the second internal coil pattern 65, and the second coil pattern 55 are electrically connected to each other in parallel.
- the first heat transfer members 70, 71, 73, 74 can reduce the current flowing through the first internal coil pattern 61. According to the circuit device 30 and the power conversion device 1 of the present embodiment, a temperature increase in a portion of the first internal coil pattern 61 sandwiched between the first core portion 46 and the second core portion 47 is suppressed. Can be done.
- the paths that dissipate the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 to the surrounding atmosphere are the following first to third. Includes heat dissipation path.
- the first heat dissipation path includes the first internal coil pattern 61, the thermal vias 81, 82, 83a, 83b, 84a, and 84b, the first base material layer 40c, the second base material layer 40d, and the first base material layer 40d of the printed circuit board 40. 3 at least one of the three base material layers 40e, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6. Of the first internal coil pattern 61, the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat causes at least one of the thermal vias 81, 82, 83a, 83b, 84a, 84b and the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. Then, it is transmitted to the first coil pattern 50. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance. The first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a. The second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes the first internal coil pattern 61, the thermal vias 81, 82, 83a, 83b, 84a, and 84b, the first base material layer 40c, the second base material layer 40d, and the second base material layer 40d of the printed circuit board 40. 3 at least one of the three base material layers 40e, the first coil pattern 50, and the first heat transfer members 70 and 71. Of the first internal coil pattern 61, the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat causes at least one of the thermal vias 81, 82, 83a, 83b, 84a, 84b and the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. Then, it is transmitted to the first coil pattern 50. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat radiation path includes a first internal coil pattern 61, thermal vias 81, 82, 83a, 83b, 84a, 84b, a second coil pattern 55, and first heat transfer members 73, 74.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transmitted to the second coil pattern 55 through the thermal vias 81, 82, 83a, 83b, 84a, 84b. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 is plural. It is dissipated to the surrounding atmosphere through the heat dissipation path. Therefore, according to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the portion of the first internal coil pattern 61 sandwiched between the first core portion 46 and the second core portion 47. Can be suppressed.
- the electrical resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 is smaller than the electrical resistance of the first coil pattern 50.
- the electric resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 is smaller than the electric resistance of the second coil pattern 55. Therefore, the electrical resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 and the electrical resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55.
- the resistance is smaller than the electric resistance of the second internal coil pattern 65.
- the first coil pattern 50, the first internal coil pattern 61, the second internal coil pattern 65, and the second coil pattern 55 are electrically connected in parallel to each other.
- the first heat transfer members 70, 71, 73, 74 can reduce the current flowing through the second internal coil pattern 65. According to the circuit device 30 and the power conversion device 1 of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 is suppressed. Can be done.
- the paths for dissipating the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 to the surrounding atmosphere are as follows. Includes heat dissipation path.
- the first heat radiation path includes the second internal coil pattern 65, the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first coil pattern 50, the second heat transfer members 80, 80a, and the radiator 6. Including. Of the second internal coil pattern 65, the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transmitted to the first coil pattern 50 through the thermal vias 81, 82, 83a, 83b, 84a, 84b. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance. The first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a. The second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes the second internal coil pattern 65, the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first coil pattern 50, and the first heat transfer members 70, 71.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transmitted to the first coil pattern 50 through the thermal vias 81, 82, 83a, 83b, 84a, 84b. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat dissipation path includes the second internal coil pattern 65, the thermal vias 81, 82, 83a, 83b, 84a, and 84b, the first base material layer 40c, the second base material layer 40d, and the second base material layer 40d of the printed circuit board 40. 3 at least one of the three base material layers 40e, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65.
- This heat causes at least one of the thermal vias 81, 82, 83a, 83b, 84a, 84b and the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40. Then, it is transmitted to the second coil pattern 55. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 is plural. It is dissipated to the surrounding atmosphere through the heat dissipation path. Therefore, according to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise in the portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47. Can be suppressed.
- the circuit device 30 and the power conversion device 1 according to the present embodiment include a printed circuit board 40 and a core 45.
- the printed circuit board 40 has a first main surface 40a and a second main surface 40b opposite to the first main surface 40a.
- the core 45 is separated from the first main surface 40a on the first main surface 40a and away from the first main surface 40a, and on the second main surface 40b away from the second main surface 40b.
- the second core portion 47 located.
- the core 45 includes a through portion (47b) penetrating between the first main surface 40a and the second main surface 40b.
- the printed circuit board 40 includes at least one of a first coil pattern 50 disposed on the first main surface 40a and a second coil pattern 55 disposed on the second main surface 40b. At least one of the first coil pattern 50 and the second coil pattern 55 surrounds the through portion (47b) of the core 45 by more than a half turn.
- the first coil pattern 50 includes the first portion 51 sandwiched between the first core portion 46 and the second core portion 47 and the first coil pattern 50 in a plan view from a direction perpendicular to the first main surface 40a. A second portion 52 exposed from at least one of the core portion 46 and the second core portion 47.
- the second coil pattern 55 includes a first portion in plan view from a direction perpendicular to the third portion 56 sandwiched between the first core portion 46 and the second core portion 47 and the second main surface 40b. A fourth portion 57 exposed from at least one of the core portion 46 and the second core portion 47.
- the circuit device 30 and the power conversion device 1 include first heat transfer members 70, 71, 73, 74 on at least one of the first portion 51 and the third portion 56.
- the first heat transfer members 70, 71, 73 and 74 are attached on at least one of the first portion 51 and the third portion 56.
- the first heat transfer members 70, 71, 73, and 74 have the first portion 51 and the second coil pattern 50 in a cross section that intersects the direction in which at least one of the first coil pattern 50 and the second coil pattern 55 flows. 3 having a cross-sectional area larger than at least one of the three portions.
- the first heat transfer members 70 and 71 have lower electrical resistance and thermal resistance than the first portion 51 of the first coil pattern 50. Since the electrical resistance and thermal resistance of the portion composed of both the first heat transfer members 70 and 71 and the first coil pattern 50 are smaller than the electrical resistance and thermal resistance of the first coil pattern 50, the first core Heat generated in the first portion 51 of the first coil pattern 50 and the first heat transfer members 70 and 71 sandwiched between the portion 46 and the second core portion 47 can be reduced. Heat generated in the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be dissipated to the outside of the circuit device 30 with a low thermal resistance. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the first heat transfer members 73 and 74 have lower electrical resistance and lower thermal resistance than the third portion 56 of the second coil pattern 55. Since the electrical resistance and thermal resistance of the portion composed of both the first heat transfer members 73 and 74 and the second coil pattern 55 are smaller than the electrical resistance and thermal resistance of the second coil pattern 55, the first core Heat generated in the third portion 56 of the second coil pattern 55 and the first heat transfer members 73 and 74 sandwiched between the portion 46 and the second core portion 47 can be reduced. The heat generated in the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be dissipated to the outside of the circuit device 30 with a low thermal resistance. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is increased. Can be suppressed.
- the temperature rise of the first portion 51 of the first coil pattern 50 can be suppressed, the temperature rise of the circuit device 30 and the power conversion device 1 is suppressed even if the first coil pattern 50 is downsized. obtain. Since the temperature rise of the third portion 56 of the second coil pattern 55 can be suppressed, the temperature rise of the circuit device 30 and the power conversion device 1 can be suppressed even if the second coil pattern 55 is downsized. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the circuit device 30 and the power conversion device 1 can be downsized.
- the circuit device 30 and the power conversion device 1 may further include a radiator 6 that is thermally connected to at least one of the second portion 52 and the fourth portion 57.
- the heat generated in at least one of the first part 51 and the third part 56 can be dissipated through the radiator 6 to the outside of the circuit device 30 with a low thermal resistance.
- a temperature increase in at least one of the first portion 51 and the third portion 56 can be further suppressed.
- the radiator 6 may constitute a part of a housing that accommodates the printed circuit board 40.
- the heat generated in at least one of the first portion 51 and the third portion 56 can be dissipated to the outside of the circuit device 30 with a low thermal resistance through the radiator 6 constituting a part of the housing.
- a temperature increase in at least one of the first portion 51 and the third portion 56 can be further suppressed.
- the circuit device 30 and the power conversion device 1 of the present embodiment may further include second heat transfer members 80 and 80a having electrical insulation.
- the printed circuit board 40 may include the first coil pattern 50.
- the second heat transfer members 80, 80 a may be disposed between the radiator 6 and the first coil pattern 50.
- the second heat transfer members 80 and 80a transmit the heat generated in the first portion 51 to the radiator 6 with a low thermal resistance while electrically insulating the first coil pattern 50 from the radiator 6. be able to. Therefore, according to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the first portion 51 can be suppressed. Since the radiator 6 is electrically insulated from the first coil pattern 50 by the second heat transfer members 80 and 80a, the radiator 6 has high thermal conductivity and high electrical conductivity such as metal. May be composed of a material having
- the circuit device 30 and the power conversion device 1 may further include a plurality of attachment members 77a and 77b for attaching the printed circuit board 40 to the radiator 6.
- the printed circuit board 40 may include the first coil pattern 50.
- the plurality of attachment members 77 a and 77 b may be arranged along the longitudinal direction of the second heat transfer member 80 so as to sandwich the second heat transfer member 80.
- the longitudinal direction of the second heat transfer member 80 may be along the direction in which the current of the first coil pattern 50 flows.
- the second heat transfer member 80 can be in contact with the first coil pattern 50 over a wide area. Further, the repulsive force in the longitudinal direction of the second heat transfer member 80 received by the printed circuit board 40 when the printed circuit board 40 is mounted to the radiator 6 using the mounting members 77 a and 77 b is short of the second heat transfer member 80. Greater than the repulsive force in the hand direction. Since the plurality of mounting members 77a and 77b are arranged along the longitudinal direction of the second heat transfer member 80 so as to sandwich the second heat transfer member 80, the printed circuit board 40 is the second heat transfer member. It is possible to prevent warping by receiving a repulsive force from 80. Therefore, the second heat transfer member 80 can more reliably contact the first coil pattern 50 over a wide area. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the first coil pattern 50 can be further suppressed.
- the second heat transfer member 80 can be crushed by the printed board 40.
- the second heat transfer member 80 crushed by the printed circuit board 40 has an even lower thermal resistance. According to the circuit device 30 and the power conversion device 1 of the present embodiment, the temperature rise of the first coil pattern 50 can be further suppressed.
- the printed circuit board 40 includes at least one of the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60 inside the printed circuit board 40. May be included. At least one of the second coil pattern 55 and the third coil pattern 60 may surround the through portion (47b) of the core 45 by a half turn or more.
- the printed circuit board 40 may include thermal vias 81, 82, 83a, 83b, 84a, and 84b.
- the thermal vias 81, 82, 83 a, 83 b, 84 a, 84 b may connect at least one of the second coil pattern 55 and the third coil pattern 60 to the first coil pattern 50.
- the thermal vias 81, 82, 83 a, 83 b, 84 a, and 84 b thermally connect at least one of the second coil pattern 55 and the third coil pattern 60 to the first coil pattern 50.
- the circuit device 30 and the power conversion device 1 of the present embodiment at least one of the second coil pattern 55 on the second main surface 40b and the third coil pattern 60 inside the printed circuit board 40. Can be dissipated with low thermal resistance from the surface of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the outside of the circuit device 30.
- the circuit device 30 and the power conversion device 1 of the present embodiment include at least one of the second coil pattern 55 and the third coil pattern 60 inside the printed circuit board 40. Therefore, various circuit configurations can be realized.
- the thermal vias 83 a and 83 b replace at least one of the second coil pattern 55 and the third coil pattern 60 with the first of the first coil pattern 50.
- the second coil pattern 55 on the second main surface 40 b and the third coil pattern 60 inside the printed circuit board 40 it is sandwiched between the first core portion 46 and the second core portion 47.
- the heat generated in the portion is transferred to the first heat transfer members 70 and 71 and the second portion 52 of the first coil pattern 50 that are thermally connected to the first portion 51 of the first coil pattern 50. Transmitted with low thermal resistance.
- this heat is low from the surface of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the outside of the circuit device 30. Can be dissipated with thermal resistance.
- the radiator 6 may be disposed above the second main surface 40 b of the printed circuit board 40.
- the radiator 6 above the second main surface 40 b of the printed circuit board 40 may be a lid that forms a part of a housing that houses the printed circuit board 40.
- the heat generated from the first coil pattern 50, the second coil pattern 55, and the third coil pattern 60 (the first internal coil pattern 61 and the second internal coil pattern 65) is It may be transmitted to the lid and dissipated from the lid to the outside of the circuit device 30.
- the circuit device 30 may include any one of the first heat transfer member 70 and the first heat transfer member 71.
- FIG. The circuit device 30a according to the second embodiment will be described with reference to FIGS.
- the circuit device 30a according to the present embodiment has the same configuration as the circuit device 30 according to the first embodiment, but mainly differs in the following points.
- the coil pattern in circuit device 30a of the present embodiment has a 2-turn 2-parallel circuit configuration.
- Printed circuit board 40 of circuit device 30a of the present embodiment includes thermal vias 91, 92, and 94.
- Each of thermal vias 91, 92, and 94 may have the same configuration as thermal via 81 in the first embodiment.
- Each of the thermal vias 91, 92, and 94 has electrical conductivity.
- the second coil pattern 55 and the second internal coil pattern 65 are electrically connected in parallel by thermal vias 91 and 94 to constitute a first parallel circuit.
- the first coil pattern 50 and the first internal coil pattern 61 are electrically connected in parallel by thermal vias 92 and 94 to constitute a second parallel circuit.
- the first parallel circuit and the second parallel circuit are electrically connected in series by a thermal via 94.
- each of thermal vias 91, 92, and 94 penetrates between first main surface 40a and second main surface 40b of printed circuit board 40.
- the thermal via 91 is electrically and thermally connected to the second coil pattern 55 and the second internal coil pattern 65, but is electrically and thermally connected to the first coil pattern 50 and the first internal coil pattern 61. Is not connected.
- the thermal via 92 is electrically and thermally connected to the first coil pattern 50 and the first internal coil pattern 61, but is electrically and thermally connected to the second coil pattern 55 and the second internal coil pattern 65. Is not connected.
- the thermal via 94 is electrically and thermally connected to the first coil pattern 50, the second coil pattern 55, the first internal coil pattern 61, and the second internal coil pattern 65.
- the printed circuit board 40 includes a first thermal pad 96 disposed on the first main surface 40a so as to be separated from the first coil pattern 50.
- the first thermal pad 96 may be disposed adjacent to the first leg portion 47 a of the second core portion 47.
- the first thermal pad 96 is made of a material having a lower thermal resistivity than the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40.
- the first thermal pad 96 may be made of copper, for example.
- the thermal via 91 may thermally connect at least one of the second coil pattern 55 and the third coil pattern 60 (second internal coil pattern 65) to the first thermal pad 96. In the present embodiment, the thermal via 91 thermally connects the second coil pattern 55 and the second internal coil pattern 65 to the first thermal pad 96.
- the second heat transfer member 80 a may extend so as to connect the thermal via 91 and the thermal via 92.
- the second heat transfer member 80 a is in surface contact with the first thermal pad 96 and is thermally connected to the first thermal pad 96.
- the first thermal pad 96 is thermally connected to the radiator 6.
- the first thermal pad 96 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6.
- the first thermal pad 96 is connected to the radiator 6 with a low thermal resistance via the second heat transfer member 80a.
- paths for dissipating heat generated in the first portion 51 of the first coil pattern 50 to the surrounding atmosphere are as follows. Includes heat dissipation path.
- the first heat radiation path includes the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50. Because of the first heat transfer members 70 and 71, the heat generated in the first portion 51 of the first coil pattern 50 is the second heat transfer members 70 and 71 and the second coil pattern 50. The portion 52 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 70 and 71 and the surface of the second portion 52 of the first coil pattern 50 to the surrounding atmosphere.
- the second heat dissipation path includes the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6. Due to the first heat transfer members 70 and 71, heat generated in the first portion 51 of the first coil pattern 50 is spread to the second portion 52 of the first coil pattern 50 with low thermal resistance. .
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat dissipation path includes the printed circuit board 40, the first thermal pad 96, the second heat transfer member 80a, and the radiator 6. Part of the heat generated in the first portion 51 of the first coil pattern 50 is transmitted into the printed circuit board 40 and further transmitted to the first thermal pad 96.
- the first thermal pad 96 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in the first portion 51 of the first coil pattern 50 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30a of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the path for dissipating the heat generated in the third portion 56 of the second coil pattern 55 to the surrounding atmosphere includes the following first to fourth heat dissipation paths.
- the first heat radiation path includes the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55. Because of the first heat transfer members 73 and 74, the heat generated in the third portion 56 of the second coil pattern 55 is the fourth heat of the first heat transfer members 73 and 74 and the second coil pattern 55. The portion 57 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 73 and 74 and the surface of the fourth portion 57 of the second coil pattern 55 to the surrounding atmosphere.
- the second heat radiation path includes the second coil pattern 55, the thermal via 94, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6. Due to the first heat transfer members 73 and 74, heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with low thermal resistance. . This heat is transferred to the first coil pattern 50 through the thermal via 94. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance. The first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a. The second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat radiation path includes the second coil pattern 55, the thermal via 94b, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance. This heat is transferred to the first coil pattern 50 through the thermal via 94. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, the heat generated in the third portion 56 of the second coil pattern 55 is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the fourth heat dissipation path includes the second coil pattern 55, the thermal via 91, the first thermal pad 96, the second heat transfer member 80a, and the radiator 6.
- the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance due to the first heat transfer members 73 and 74. .
- This heat is transferred to the first thermal pad 96 through the thermal via 91.
- the first thermal pad 96 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the heat generated in the third portion 56 of the second coil pattern 55 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30a of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the dissipating path includes the following first to third heat dissipation paths.
- the first heat radiation path includes at least one of the first internal coil pattern 61, the thermal vias 92 and 94, and the printed circuit board 40, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6. Including. Of the first internal coil pattern 61, the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transmitted to the first coil pattern 50 through at least one of the thermal vias 92 and 94 and the printed circuit board 40. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance. The first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a. The second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes at least one of the first internal coil pattern 61, the thermal vias 92 and 94, and the printed board 40, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat is transmitted to the first coil pattern 50 through at least one of the thermal vias 92 and 94 and the printed circuit board 40. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat radiation path includes the first internal coil pattern 61, the thermal via 94, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transferred to the second coil pattern 55 through the thermal via 94. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- heat generated in a portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30a of the present embodiment, a temperature increase in a portion of the first internal coil pattern 61 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the heat generated in the portion sandwiched between first core portion 46 and second core portion 47 in second internal coil pattern 65 is changed to the surrounding atmosphere.
- the paths to be dissipated include the following first to fourth heat dissipation paths.
- the first heat dissipation path includes the second internal coil pattern 65, the thermal via 94, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first coil pattern 50 through the thermal via 94. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes the second internal coil pattern 65, the thermal via 94, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first coil pattern 50 through the thermal via 94. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat radiation path includes the second internal coil pattern 65, the thermal via 91, the first thermal pad 96, the second heat transfer member 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first thermal pad 96 through the thermal via 91.
- the first thermal pad 96 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the fourth heat radiation path includes at least one of the second internal coil pattern 65, the thermal vias 91 and 94, and the printed board 40, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transmitted to the second coil pattern 55 through at least one of the thermal vias 91 and 94 and the printed board 40. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30a of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the effect of the circuit device 30a of the present embodiment will be described.
- the circuit device 30a of the present embodiment has the same effects as the circuit device 30 of the first embodiment, but differs mainly in the following points.
- the printed circuit board 40 includes a first coil pattern 50, and a first thermal pad 96 that is disposed on the first main surface 40a away from the first coil pattern 50. May be included.
- the first thermal pad 96 may be thermally connected to the radiator 6. Part of the heat generated in the first portion 51 of the first coil pattern 50 is transferred into the printed circuit board 40.
- the heat transferred into the printed circuit board 40 is transferred to the radiator 6 through the first thermal pad 96 with a low thermal resistance. This heat can be dissipated from the radiator 6 to the surrounding atmosphere. According to the circuit device 30a of the present embodiment, the temperature rise of the circuit device 30a can be further suppressed.
- the printed circuit board 40 may include at least one of the second coil pattern 55 and the third coil pattern 60 inside the printed circuit board 40. At least one of the second coil pattern 55 and the third coil pattern 60 may surround the through-hole (47b) of the core 45 by more than a half turn.
- the printed circuit board 40 may include a thermal via 91.
- the thermal via 91 may connect at least one of the second coil pattern 55 and the third coil pattern 60 (second internal coil pattern 65) to the first thermal pad 96. At least one of the second coil pattern 55 and the third coil pattern 60 is thermally connected to the radiator 6 via the thermal via 91 and the first thermal pad 96.
- the heat generated in at least one of the second coil pattern 55 and the third coil pattern 60 can be dissipated to the outside of the circuit device 30a with a low thermal resistance. According to the circuit device 30a of the present embodiment, the temperature increase of at least one of the second coil pattern 55 and the third coil pattern 60 can be further suppressed.
- FIG. 3 A circuit device 30b according to the third embodiment will be described with reference to FIGS.
- the circuit device 30b according to the present embodiment has the same configuration as the circuit device 30a according to the second embodiment, but mainly differs in the following points.
- the printed circuit board 40 includes a first coil on the first main surface 40a in addition to the first thermal pad 96.
- a first thermal pad 96a disposed away from the pattern 50 is included.
- the first thermal pads 96 and 96 a may be located on both sides of the first leg portion 47 a of the second core portion 47.
- the first thermal pad 96 a is thermally connected to the radiator 6.
- the first thermal pad 96 a is in surface contact with the second heat transfer member 80
- the second heat transfer member 80 is in surface contact with the radiator 6. In this way, the first thermal pad 96a is connected to the radiator 6 through the second heat transfer member 80 with a low thermal resistance.
- the first coil pattern 50 includes a first extension portion 53 that extends a part of the first coil pattern 50 at a position deviating from the current path of the first coil pattern 50.
- printed circuit board 40 includes second thermal pads 97 and 97a arranged on second main surface 40b apart from second coil pattern 55. .
- the second thermal pads 97 and 97 a may be located on both sides of the third leg portion 47 c of the second core portion 47.
- the second coil pattern 55 includes a second extension 58 that extends a part of the second coil pattern 55 at a position deviating from the current path of the second coil pattern 55.
- printed circuit board 40 has third thermal pads 98 and 98a arranged on the same layer as first internal coil pattern 61 and away from first internal coil pattern 61. including.
- the third thermal pads 98 and 98a may be located on both sides of the first leg portion 47a of the second core portion 47.
- the first internal coil pattern 61 includes a second extension 62 that extends a part of the first internal coil pattern 61 at a position deviated from the current path of the first internal coil pattern 61.
- printed circuit board 40 has third thermal pads 99 and 99a arranged on the same layer as second internal coil pattern 65 and spaced apart from second internal coil pattern 65. including.
- the third thermal pads 99 and 99a may be located on both sides of the third leg portion 47c of the second core portion 47.
- the second internal coil pattern 65 includes a second extended portion 66 that extends a part of the second internal coil pattern 65 at a position deviated from the current path of the second internal coil pattern 65.
- the first thermal pad 96a, the second thermal pads 97, 97a, and the third thermal pads 98, 98a, 99, 99a are a first base layer 40c, a second base layer 40d, and It is comprised with the material which has a thermal resistivity lower than the 3rd base material layer 40e.
- the first thermal pad 96a, the second thermal pads 97, 97a, and the third thermal pads 98, 98a, 99, 99a may be made of copper, for example.
- printed circuit board 40 of circuit device 30b of the present embodiment includes thermal vias 93 and 95 in addition to thermal vias 91, 92, and 94.
- thermal vias 93 and 95 may have the same configuration as thermal via 81 in the first embodiment.
- thermal vias 93 and 95 may have electrical conductivity or electrical insulation.
- the thermal via 93 may thermally connect at least one second extended portion 58, 66 of the second coil pattern 55 and the third coil pattern 60 to the first thermal pad 96a.
- the thermal via 93 includes the first thermal pad 96 a, the third thermal pad 98 a, the second extension 66 of the second internal coil pattern 65, and the second of the second coil pattern 55.
- the extension 58 is thermally connected.
- the thermal via 95 thermally connects at least one second extended portion 62 of the second coil pattern 55 and the third coil pattern 60 to the first extended portion 53 of the first coil pattern 50. Also good.
- the thermal via 95 includes the first extended portion 53 of the first coil pattern 50, the second extended portion 62 of the first internal coil pattern 61, the third thermal pad 99a, and the second thermal pad 99a.
- the thermal pad 97a is thermally connected.
- the thermal via 91 thermally connects the first thermal pad 96, the third thermal pad 98, the second internal coil pattern 65, and the second coil pattern 55.
- the thermal via 92 thermally connects the first coil pattern 50, the first internal coil pattern 61, the third thermal pad 99, and the second thermal pad 97.
- the second heat transfer member 80 extends along the longitudinal direction of the first coil pattern 50 on the second portion 52 of the first coil pattern 50. Also good.
- the second heat transfer member 80 may extend so as to connect the thermal via 93 and the thermal via 95.
- the second heat transfer member 80 may extend so as to connect the first thermal pad 96 a and the first extended portion 53 of the first coil pattern 50.
- the second heat transfer member 80 is in surface contact with the first extension portion 53 and the first thermal pad 96a of the first coil pattern 50.
- the second heat transfer member 80 a may extend so as to connect the thermal via 91 and the thermal via 92.
- the second heat transfer member 80 a may extend so as to connect the first thermal pad 96 and both ends of the first coil pattern 50.
- the second heat transfer member 80 a is in surface contact with the first thermal pad 96 in addition to the second portion 52 of the first coil pattern 50.
- the path for dissipating the heat generated in the first portion 51 of the first coil pattern 50 to the surrounding atmosphere is the same as that in the first embodiment.
- the following fourth to sixth heat radiation paths are included.
- the fourth heat radiation path includes the first extended portion 53 of the first coil pattern 50. Because of the first heat transfer members 70 and 71, the heat generated in the first portion 51 of the first coil pattern 50 is distributed throughout the first heat transfer members 70 and 71 and the first coil pattern 50. Expanded with low thermal resistance. This heat is dissipated from the surface of the first extended portion 53 of the first coil pattern 50 to the surrounding atmosphere.
- the fifth heat radiation path includes the first extension portion 53, the second heat transfer member 80, and the radiator 6. Due to the first heat transfer members 70 and 71, the heat generated in the first portion 51 of the first coil pattern 50 is spread to the first extended portion 53 with low thermal resistance. The first extended portion 53 is in surface contact with the second heat transfer member 80. The second heat transfer member 80 is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the sixth heat dissipation path includes the printed circuit board 40, the first thermal pad 96a, the second heat transfer member 80, and the radiator 6. Part of the heat generated in the first portion 51 of the first coil pattern 50 is transmitted into the printed circuit board 40 and further transmitted to the first thermal pad 96a.
- the first thermal pad 96 a is in surface contact with the second heat transfer member 80.
- the second heat transfer member 80 is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in the first portion 51 of the first coil pattern 50 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30b of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the paths for dissipating the heat generated in the third portion 56 of the second coil pattern 55 to the surrounding atmosphere are the first to fourth heat dissipation paths of the second embodiment.
- the following fifth to seventh heat dissipation paths are included.
- the fifth heat radiation path includes the second extended portion 58 of the second coil pattern 55. Due to the first heat transfer members 73 and 74, the heat generated in the third portion 56 of the second coil pattern 55 is distributed throughout the first heat transfer members 73 and 74 and the second coil pattern 55. Expanded with low thermal resistance. This heat is dissipated from the surface of the second extended portion 58 of the second coil pattern 55 to the surrounding atmosphere.
- the sixth heat radiation path includes the second extension 58, the thermal via 93, the first thermal pad 96a, the second heat transfer member 80, and the radiator 6. Due to the first heat transfer members 73 and 74, the heat generated in the third portion 56 of the second coil pattern 55 is spread to the second extended portion 58 of the second coil pattern 55 with a low thermal resistance. It is done. This heat is transferred to the first thermal pad 96a through the thermal via 93. The first thermal pad 96 a is in surface contact with the second heat transfer member 80. The second heat transfer member 80 is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the seventh heat dissipation path includes the printed circuit board 40, the second thermal pads 97 and 97a, the thermal vias 92 and 95, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6. Part of the heat generated in the third portion 56 of the second coil pattern 55 is transmitted into the printed circuit board 40 and further transmitted to the second thermal pads 97 and 97a. This heat is transmitted to the first coil pattern 50 through the thermal vias 92 and 95. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance. The first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a. The second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in the third portion 56 of the second coil pattern 55 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30b of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- Dissipating paths include the following fourth to seventh heat dissipation paths in addition to the first to third heat dissipation paths of the second embodiment.
- the fourth heat radiation path includes at least one of the second extended portion 62 of the first internal coil pattern 61, the thermal via 95 and the printed circuit board 40, the first coil pattern 50 including the first extended portion 53, the first 2 heat transfer members 80, 80 a and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is also transmitted to the second extension portion 62 of the first internal coil pattern 61. Can be expanded. This heat is transmitted to the first coil pattern 50 including the first extension 53 through at least one of the thermal via 95 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the fifth heat dissipation path includes at least one of the second extended portion 62, the thermal via 95, and the printed board 40 of the first internal coil pattern 61, the first coil pattern 50 including the first extended portion 53, and the first coil pattern 50.
- 1 heat transfer member 70, 71 Of the first internal coil pattern 61, the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is also transmitted to the second extension portion 62 of the first internal coil pattern 61. Can be expanded. This heat is transmitted to the first coil pattern 50 including the first extension 53 through at least one of the thermal via 95 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the sixth heat radiation path includes the printed circuit board 40, third thermal pads 98 and 98 a, thermal vias 91 and 93, first thermal pads 96 and 96 a, second heat transfer members 80 and 80 a, and the radiator 6. .
- a part of the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 is transmitted into the printed circuit board 40, It is transmitted to the thermal pads 98 and 98a.
- This heat is transmitted to the first thermal pads 96 and 96a through the thermal vias 91 and 93.
- the first thermal pads 96 and 96a are in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer member 80 is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the seventh heat radiation path includes the printed circuit board 40, the third thermal pads 98 and 98a, the thermal vias 91 and 93, the second coil pattern 55, and the first heat transfer members 73 and 74.
- a part of the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 is transmitted into the printed circuit board 40, It is transmitted to the thermal pads 98 and 98a.
- This heat is transmitted to the second coil pattern 55 including the second extended portion 58 through the thermal vias 91 and 93. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30b of the present embodiment, a temperature increase in the portion between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 can be suppressed.
- the dissipating paths include the following fifth to eighth heat dissipation paths in addition to the first to fourth heat dissipation paths of the second embodiment.
- the fifth heat radiation path includes the second extension 66 of the second internal coil pattern 65, the thermal via 93, the first thermal pad 96a, the second heat transfer member 80, and the radiator 6.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is also transmitted to the second extension portion 66 of the second internal coil pattern 65.
- This heat is transferred to the first thermal pad 96a through the thermal via 93.
- the first thermal pad 96 a is in surface contact with the second heat transfer member 80.
- the second heat transfer member 80 is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the sixth heat dissipation path includes at least one of the second extension portion 66, the thermal via 93 and the printed circuit board 40 of the second internal coil pattern 65, the second coil pattern 55 including the second extension portion 58, and the second coil pattern 55. 1 heat transfer members 73 and 74.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is also transmitted to the second extension portion 66 of the second internal coil pattern 65. Can be expanded. This heat is transferred to the second coil pattern 55 including the second extension 58 through at least one of the thermal via 93 and the printed board 40.
- this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the seventh heat dissipation path includes the printed circuit board 40, the third thermal pads 99 and 99a, the thermal vias 92 and 95, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- Part of the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 is transmitted into the printed circuit board 40, and further It is transmitted to the thermal pads 99 and 99a.
- This heat is transmitted to the first coil pattern 50 including the first extended portion 53 through the thermal vias 92 and 95. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the eighth heat radiation path includes the printed circuit board 40, the third thermal pads 99 and 99a, the thermal vias 92 and 95, the first coil pattern 50, and the first heat transfer members 70 and 71.
- Part of the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 is transmitted into the printed circuit board 40, and further It is transmitted to the thermal pads 99 and 99a.
- This heat is transmitted to the first coil pattern 50 including the first extended portion 53 through the thermal vias 92 and 95. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30b of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 that is sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the circuit device 30b of the present embodiment has the same effects as the circuit device 30a of the second embodiment, but differs mainly in the following points.
- the first coil pattern 50 is a first extension portion in which a part of the first coil pattern 50 is extended to a position deviated from the current path of the first coil pattern 50.
- 53 may be included.
- the thermal via 95 connects at least one of the second coil pattern 55 and the third coil pattern 60 (first internal coil pattern 61) to the first extension portion 53 of the first coil pattern 50. Also good. More specifically, at least one of the second coil pattern 55 and the third coil pattern 60 (first internal coil pattern 61) is the second coil pattern 55 and third coil pattern 60 (first coil pattern 60). The second coil pattern 55 and the third coil pattern 60 (first internal coil pattern 61) are partially extended to a position deviated from at least one current path of the internal coil pattern 61).
- the thermal via 95 may include the two extended portions 62, and the second extended portion 62 may be connected to the first extended portion 53 of the first coil pattern 50.
- the heat generated in at least one of the second coil pattern 55 and the third coil pattern 60 is dissipated to the surrounding atmosphere with a low thermal resistance through the first extension portion 53 of the first coil pattern 50.
- the temperature increase of at least one of the second coil pattern 55 and the third coil pattern 60 can be suppressed.
- At least one of the second coil pattern 55 and the third coil pattern 60 is the second coil pattern 55 and the third coil pattern.
- 60 (second internal coil pattern 65) at least one part of the second coil pattern 55 and the third coil pattern 60 (second internal coil pattern 65) at a position deviated from at least one current path.
- the second extended portions 58 and 66 may be included.
- the thermal via 93 connects at least one second extension 58, 66 of the second coil pattern 55 and the third coil pattern 60 (second internal coil pattern 65) to the first thermal pad 96a. May be.
- FIG. 4 A circuit device 30c according to the fourth embodiment will be described with reference to FIGS. 19, 24, and 38 to 43.
- FIG. The circuit device 30c of the present embodiment has the same configuration as that of the circuit device 30a of the second embodiment, but mainly differs in the following points.
- the printed circuit board 40 of the circuit device 30c of the present embodiment includes thermal vias 101a, 101b, 102a, and 102b in addition to the thermal vias 91, 92, and 94.
- Each of thermal vias 101a, 101b, 102a, 102b may have a configuration similar to that of thermal via 81 in the first embodiment.
- Each of the thermal vias 101a, 101b, 102a, 102b may have electrical conductivity or may have electrical insulation.
- thermal vias 101 a and 101 b include first core portion 46 and second core portion 51 of first coil pattern 50 and first inner coil pattern 61. The portion sandwiched between the core portion 47 is thermally connected. The thermal vias 101 a and 101 b are not connected to the second internal coil pattern 65 and the second coil pattern 55. In the circuit device 30c of the present embodiment, the first coil pattern 50 and the first internal coil pattern 61 are electrically connected in parallel by the thermal vias 92 and 94, so the thermal vias 101a and 101b are It may have electrical conductivity.
- the thermal vias 102 a and 102 b include the third portion 56 of the second coil pattern 55 and the first core portion 46 of the second internal coil pattern 65. A portion sandwiched between the second core portions 47 is thermally connected.
- the thermal vias 102 a and 102 b are not connected to the first internal coil pattern 61 and the first coil pattern 50.
- the thermal vias 102a and 102b are It may have electrical conductivity.
- a path for dissipating heat generated in a portion sandwiched between first core portion 46 and second core portion 47 of first internal coil pattern 61 to the surrounding atmosphere includes the following fourth and fifth heat dissipation paths in addition to the first to third heat dissipation paths of the second embodiment.
- the fourth heat radiation path includes the thermal vias 101a and 101b, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 passes through the thermal vias 101a and 101b to the first coil pattern 50. Communicated. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the fifth heat radiation path includes the thermal vias 101a and 101b, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 passes through the thermal vias 101a and 101b to the first coil pattern 50. Communicated. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- heat generated in a portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30c of the present embodiment, a temperature increase in the portion of the first internal coil pattern 61 that is sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the path to be diffused includes the following fifth heat dissipation path in addition to the first to fourth heat dissipation paths of the second embodiment.
- the fifth heat radiation path includes the thermal vias 102a and 102b, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 passes through the thermal vias 102a and 102b to the second coil pattern 55. Communicated. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30c of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the effect of the circuit device 30c of the present embodiment will be described.
- the circuit device 30c of the present embodiment has the following effects.
- the printed circuit board 40 of the circuit device 30c of the present embodiment includes thermal vias 101a, 101b, 102a, and 102b. Therefore, the heat generated in the third coil pattern 60 is dissipated to the surrounding atmosphere with low thermal resistance through the thermal vias 101a, 101b, 102a, 102b. According to the circuit device 30c of the present embodiment, the temperature rise of the third coil pattern 60 can be suppressed.
- Embodiment 5 FIG.
- the circuit device 30d according to the fifth embodiment will be described with reference to FIGS.
- the circuit device 30d of the present embodiment has the same configuration as the circuit device 30a of the second embodiment and has the same effects, but mainly differs in the following points.
- the coil pattern in the circuit device 30d of the present embodiment has a three-turn connection circuit configuration.
- the printed circuit board 40 of the circuit device 30d of the present embodiment includes thermal vias 111 and 112.
- Each of thermal vias 111 and 112 has the same configuration as thermal via 81 in the first embodiment.
- Each of the thermal vias 111 and 112 has electrical conductivity.
- the first internal coil pattern 61 and the second internal coil pattern 65 are electrically connected in parallel by thermal vias 111 and 112.
- the second coil pattern 55 is electrically connected in series with the first internal coil pattern 61 and the second internal coil pattern 65 by the thermal via 111.
- the first coil pattern 50 is electrically connected in series with the first internal coil pattern 61 and the second internal coil pattern 65 by the thermal via 112.
- each of thermal vias 111 and 112 penetrates between first main surface 40a and second main surface 40b of printed circuit board 40.
- the thermal via 111 is electrically and thermally connected to the second coil pattern 55, the first internal coil pattern 61, and the second internal coil pattern 65, but is electrically and thermally connected to the first coil pattern 50. Is not connected.
- the thermal via 112 is electrically and thermally connected to the first coil pattern 50, the first internal coil pattern 61, and the second internal coil pattern 65, but is electrically and thermally connected to the second coil pattern 55. Is not connected.
- the printed circuit board 40 includes a first thermal pad 116 disposed on the first main surface 40a so as to be separated from the first coil pattern 50.
- the first thermal pad 116 may be disposed in a region adjacent to the second leg portion of the second core portion 47 and where the first coil pattern 50 does not exist.
- the thermal via 111 may thermally connect at least one of the second coil pattern 55 and the third coil pattern 60 to the first thermal pad 116. In the present embodiment, the thermal via 111 thermally connects the second coil pattern 55, the first internal coil pattern 61, and the second internal coil pattern 65 to the first thermal pad 116.
- the second heat transfer member 80a may extend so as to connect the thermal via 111 and the thermal via 112 to each other.
- the second heat transfer member 80 a may be in surface contact with the first coil pattern 50.
- the first thermal pad 116 is in surface contact with the second heat transfer member 80a and is thermally connected to the second heat transfer member 80a.
- the paths for dissipating the heat generated in the first portion 51 of the first coil pattern 50 to the surrounding atmosphere are as follows. Includes heat dissipation path.
- the first heat radiation path includes the first heat transfer members 70 and 71 and the first coil pattern 50.
- the heat generated in the first portion 51 of the first coil pattern 50 is generated by the first heat transfer members 70 and 71 and the second heat transfer members 70 and 71 because of the first heat transfer members 70 and 71.
- the portion 52 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 70 and 71 and the surface of the second portion 52 of the first coil pattern 50 to the surrounding atmosphere.
- the second heat dissipation path includes the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the heat generated in the first portion 51 of the first coil pattern 50 is spread to the second portion 52 of the first coil pattern 50 with a low thermal resistance due to the first heat transfer members 70 and 71. .
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat dissipation path includes the printed circuit board 40, the first thermal pad 116, the second heat transfer member 80a, and the radiator 6. Part of the heat generated in the first portion 51 of the first coil pattern 50 is transmitted into the printed circuit board 40 and further transmitted to the first thermal pad 116.
- the first thermal pad 116 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in the first portion 51 of the first coil pattern 50 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30d of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the path for dissipating the heat generated in the third portion 56 of the second coil pattern 55 to the surrounding atmosphere includes the following first and second heat dissipation paths.
- the first heat radiation path includes the first heat transfer members 73 and 74 and the second coil pattern 55.
- the heat generated in the third portion 56 of the second coil pattern 55 is generated by the first heat transfer members 73 and 74 and the fourth heat of the second coil pattern 55 because of the first heat transfer members 73 and 74.
- the portion 57 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 73 and 74 and the surface of the fourth portion 57 of the second coil pattern 55 to the surrounding atmosphere.
- the second heat radiation path includes the second coil pattern 55, the thermal via 111, the first thermal pad 116, the second heat transfer member 80a, and the radiator 6.
- the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance due to the first heat transfer members 73 and 74. .
- This heat is transferred to the first thermal pad 116 through the thermal via 111.
- the first thermal pad 116 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the heat generated in the third portion 56 of the second coil pattern 55 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30d of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- heat generated in a portion sandwiched between first core portion 46 and second core portion 47 in first internal coil pattern 61 is changed to the surrounding atmosphere.
- the paths to be dissipated include the following first to fourth heat dissipation paths.
- the first heat radiation path includes at least one of the first internal coil pattern 61, the thermal via 112, and the printed board 40, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat is transmitted to the first coil pattern 50 through at least one of the thermal via 112 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes at least one of the first internal coil pattern 61, the thermal via 112, and the printed board 40, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transmitted to the first coil pattern 50 through at least one of the thermal via 112 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat dissipation path includes at least one of the first internal coil pattern 61, the thermal via 111, and the printed board 40, the first thermal pad 116, the second heat transfer member 80a, and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat is transferred to the first thermal pad 116 through at least one of the thermal via 111 and the printed board 40.
- the first thermal pad 116 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the fourth heat dissipation path includes the first internal coil pattern 61, the thermal via 111, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transmitted to the second coil pattern 55 through the thermal via 111. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- heat generated in a portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30d of the present embodiment, a temperature increase in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 can be suppressed.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 is changed to the ambient atmosphere.
- the paths to be dissipated include the following first to fourth heat dissipation paths.
- the first heat dissipation path includes the second internal coil pattern 65, the thermal via 112, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first coil pattern 50 through the thermal via 112. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes the second internal coil pattern 65, the thermal via 112, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first coil pattern 50 through the thermal via 112. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat dissipation path includes the second internal coil pattern 65, the thermal via 111, the first thermal pad 116, the second heat transfer member 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first thermal pad 116 through the thermal via 111.
- the first thermal pad 116 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the fourth heat radiation path includes at least one of the second internal coil pattern 65, the thermal via 111, and the printed board 40, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transmitted to the second coil pattern 55 through at least one of the thermal via 111 and the printed circuit board 40. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- heat generated in a portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30d of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- FIG. 6 The circuit device 30e according to the sixth embodiment will be described with reference to FIGS.
- the circuit device 30e of the present embodiment has the same configuration as that of the circuit device 30a of the second embodiment, but mainly differs in the following points.
- the coil pattern in circuit device 30e of the present embodiment has a circuit configuration with a 4-turn connection.
- Printed circuit board 40 of circuit device 30e of the present embodiment includes thermal vias 121, 122, and 123. Each of thermal vias 121, 122, and 123 has the same configuration as thermal via 81 in the first embodiment. Each of the thermal vias 121, 122, 123 has electrical conductivity.
- the second coil pattern 55 and the second internal coil pattern 65 are electrically connected in series by the thermal via 121.
- the second internal coil pattern 65 and the first internal coil pattern 61 are electrically connected in series by a thermal via 122.
- the first internal coil pattern 61 and the first coil pattern 50 are electrically connected in series by a thermal via 123.
- each of thermal vias 121, 122, 123 penetrates between first main surface 40a and second main surface 40b of printed circuit board 40.
- the thermal via 121 is electrically and thermally connected to the second coil pattern 55 and the second internal coil pattern 65, but is electrically and thermally connected to the first coil pattern 50 and the first internal coil pattern 61. Is not connected.
- the thermal via 122 is electrically and thermally connected to the first internal coil pattern 61 and the second internal coil pattern 65, but is electrically and thermally connected to the first coil pattern 50 and the second coil pattern 55. Is not connected.
- the thermal via 123 is electrically and thermally connected to the first coil pattern 50 and the first internal coil pattern 61, but is electrically and thermally connected to the second coil pattern 55 and the second internal coil pattern 65. Is not connected.
- a plurality of coil patterns (first coil pattern 50, second coil pattern 55, third coil pattern 60) having substantially different pattern shapes are stacked.
- Each of the thermal vias 121, 122, and 123 is electrically connected to two adjacent coil patterns among a plurality of coil patterns (first coil pattern 50, second coil pattern 55, and third coil pattern 60). However, it is not electrically connected to a plurality of coil patterns except for these two coil patterns. Thus, a circuit configuration in which a plurality of coil patterns are electrically connected in series to each other is obtained.
- printed circuit board 40 includes first thermal pads 126 and 127 arranged on first main surface 40a apart from first coil pattern 50.
- the first thermal pad 126 may be disposed adjacent to the end of the first coil pattern 50.
- the first thermal pad 127 may be disposed in a region adjacent to the second leg portion of the second core portion 47 and where the first coil pattern 50 does not exist.
- the thermal via 121 may thermally connect at least one of the second coil pattern 55 and the third coil pattern 60 to the first thermal pad 126. In the present embodiment, the thermal via 121 thermally connects the second coil pattern 55 and the second internal coil pattern 65 to the first thermal pad 126.
- the thermal via 122 may thermally connect at least one of the second coil pattern 55 and the third coil pattern 60 to the first thermal pad 127.
- the thermal via 122 thermally connects the first internal coil pattern 61 and the second internal coil pattern 65 to the first thermal pad 127.
- the second heat transfer member 80a may extend so as to connect the thermal vias 121, 122, and 123.
- the second heat transfer member 80 a may extend so as to connect both ends of the first coil pattern 50.
- the second heat transfer member 80 a may be in surface contact with the first coil pattern 50.
- the first thermal pads 126 and 127 are in surface contact with the second heat transfer member 80a and thermally connected to the second heat transfer member 80a.
- the paths for dissipating heat generated in the first portion 51 of the first coil pattern 50 to the surrounding atmosphere are as follows. Includes heat dissipation path.
- the first heat radiation path includes the first heat transfer members 70 and 71 and the second portion 52 of the first coil pattern 50.
- the heat generated in the first portion 51 of the first coil pattern 50 is generated by the first heat transfer members 70 and 71 and the second heat transfer members 70 and 71 because of the first heat transfer members 70 and 71.
- the portion 52 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 70 and 71 and the surface of the second portion 52 of the first coil pattern 50 to the surrounding atmosphere.
- the second heat dissipation path includes the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the heat generated in the first portion 51 of the first coil pattern 50 is spread to the second portion 52 of the first coil pattern 50 with a low thermal resistance due to the first heat transfer members 70 and 71. .
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat dissipation path includes the printed circuit board 40, the first thermal pads 126 and 127, the second heat transfer member 80a, and the radiator 6. Part of the heat generated in the first portion 51 of the first coil pattern 50 is transmitted into the printed circuit board 40 and further transmitted to the first thermal pads 126 and 127. The first thermal pads 126 and 127 are in surface contact with the second heat transfer member 80a. The second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in the first portion 51 of the first coil pattern 50 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30e of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the path for dissipating the heat generated in the third portion 56 of the second coil pattern 55 to the surrounding atmosphere includes the following first and second heat dissipation paths.
- the first heat radiation path includes the first heat transfer members 73 and 74 and the fourth portion 57 of the second coil pattern 55.
- the heat generated in the third portion 56 of the second coil pattern 55 is generated by the first heat transfer members 73 and 74 and the fourth heat of the second coil pattern 55 because of the first heat transfer members 73 and 74.
- the portion 57 is spread with a low thermal resistance. This heat is dissipated from the surface of the first heat transfer members 73 and 74 and the surface of the fourth portion 57 of the second coil pattern 55 to the surrounding atmosphere.
- the second heat radiation path includes the second coil pattern 55, the thermal via 121, the first thermal pad 126, the second heat transfer member 80a, and the radiator 6.
- the heat generated in the third portion 56 of the second coil pattern 55 is spread to the fourth portion 57 of the second coil pattern 55 with a low thermal resistance due to the first heat transfer members 73 and 74. .
- This heat is transferred to the first thermal pad 126 through the thermal via 121.
- the first thermal pad 126 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the heat generated in the third portion 56 of the second coil pattern 55 is dissipated to the surrounding atmosphere through a plurality of heat dissipation paths. According to the circuit device 30e of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the dissipating path includes the following first to third heat dissipation paths.
- the first heat dissipation path includes at least one of the first internal coil pattern 61, the thermal via 123, and the printed board 40, the first coil pattern 50, the second heat transfer members 80 and 80a, and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat is transmitted to the first coil pattern 50 through at least one of the thermal via 123 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread over the entire first coil pattern 50 with a low thermal resistance.
- the first coil pattern 50 is in surface contact with the second heat transfer members 80 and 80a.
- the second heat transfer members 80, 80 a are in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes at least one of the first internal coil pattern 61, the thermal via 123, and the printed board 40, the first coil pattern 50, and the first heat transfer members 70 and 71.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61. This heat is transmitted to the first coil pattern 50 through at least one of the thermal via 123 and the printed board 40. Due to the first heat transfer members 70 and 71, this heat is spread to the entire first coil pattern 50 and the first heat transfer members 70 and 71 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 70 and 71 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the third heat radiation path includes at least one of the first internal coil pattern 61, the thermal via 122, and the printed board 40, the first thermal pad 127, the second heat transfer member 80a, and the radiator 6.
- the first internal coil pattern 61 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire first internal coil pattern 61.
- This heat is transferred to the first thermal pad 127 through at least one of the thermal via 122 and the printed circuit board 40.
- the first thermal pad 127 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- heat generated in a portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30e of the present embodiment, a temperature increase in a portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 can be suppressed.
- the dissipating path includes the following first to third heat dissipation paths.
- the first heat radiation path includes the second internal coil pattern 65, the thermal via 121, the first thermal pad 126, the second heat transfer member 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first thermal pad 126 through the thermal via 121.
- the first thermal pad 126 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the second heat radiation path includes the second internal coil pattern 65, the thermal via 122, the first thermal pad 127, the second heat transfer member 80a, and the radiator 6.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transferred to the first thermal pad 127 through the thermal via 122.
- the first thermal pad 127 is in surface contact with the second heat transfer member 80a.
- the second heat transfer member 80 a is in surface contact with the radiator 6. Therefore, this heat is transmitted to the radiator 6 with a low thermal resistance and is dissipated from the radiator 6 to the surrounding atmosphere.
- the third heat radiation path includes at least one of the second internal coil pattern 65, the thermal via 121, and the printed board 40, the second coil pattern 55, and the first heat transfer members 73 and 74.
- the second internal coil pattern 65 the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 is spread over the entire second internal coil pattern 65. This heat is transmitted to the second coil pattern 55 through at least one of the thermal via 121 and the printed board 40. Due to the first heat transfer members 73 and 74, this heat is spread to the entire second coil pattern 55 and the first heat transfer members 73 and 74 with low heat resistance. Therefore, this heat is dissipated from the surfaces of the first heat transfer members 73 and 74 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 passes through a plurality of heat dissipation paths. Dissipated into the surrounding atmosphere. According to the circuit device 30e of the present embodiment, a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the circuit device 30e of the present embodiment has the same effects as the circuit device 30a of the second embodiment and the circuit device 30d of the fifth embodiment.
- FIG. 7 A circuit device 30f according to the seventh embodiment will be described with reference to FIGS. 7, 8, 11, 12, and 66 to 69.
- FIG. The circuit device 30f of the present embodiment has the same configuration as the circuit device 30 of the first embodiment, but mainly differs in the following points.
- the coil pattern in the circuit device 30f of the present embodiment has a circuit configuration of one turn and two parallel connections.
- the third coil pattern 60 is removed from the circuit device 30 of the first embodiment.
- the printed circuit board 40 is made of a single layer base material.
- the printed circuit board 40 has both surfaces in which the first coil pattern 50 is disposed on the first main surface 40a and the second coil pattern 55 is disposed on the second main surface 40b. It is a substrate.
- the circuit device 30f of the present embodiment has the same effects as those of the circuit device 30 of the first embodiment except for the effects produced by the third coil pattern 60.
- FIG. 8 A circuit device 30g according to the eighth embodiment will be described with reference to FIGS.
- the circuit device 30g according to the present embodiment has the same configuration as the circuit device 30f according to the seventh embodiment, but mainly differs in the following points.
- the coil pattern in circuit device 30g of the present embodiment has a two-turn connection circuit configuration.
- the printed circuit board 40 of the circuit device 30g of the present embodiment includes a thermal via 131.
- the thermal via 131 has the same configuration as that of the thermal via 81 of the first embodiment.
- the thermal via 131 has electrical conductivity.
- the first coil pattern 50 and the second coil pattern 55 are electrically connected in series by a thermal via 131.
- thermal via 131 penetrates between first main surface 40a and second main surface 40b of printed circuit board 40.
- the thermal via 131 is electrically and thermally connected to the first coil pattern 50 and the second coil pattern 55.
- the heat dissipation path of the circuit device 30g of the present embodiment is the same as that of the seventh embodiment except that the thermal vias 81, 82, 83a, 83b, 84a, and 84b of the seventh embodiment are replaced with the thermal vias 131 of the present embodiment. This is the same as the heat dissipation path of the circuit device 30f.
- the circuit device 30g of the present embodiment has the same effects as the circuit device 30f of the seventh embodiment.
- FIG. 9 A circuit device 30h according to the ninth embodiment will be described with reference to FIGS.
- the circuit device 30h according to the present embodiment has the same configuration as the circuit device 30g according to the eighth embodiment, but mainly differs in the following points.
- the coil pattern in the circuit device 30h of the present embodiment has a one-turn connection circuit configuration.
- the first heat transfer members 73 and 74, the second coil pattern 55, and the thermal via 131 are removed from the circuit device 30g of the eighth embodiment.
- the circuit device 30h according to the present embodiment has the same effects as those of the circuit device 30g according to the eighth embodiment except for the effects produced by the first heat transfer members 73 and 74, the second coil pattern 55, and the thermal via 131. Play.
- FIG. 10 A circuit device 30i according to the tenth embodiment will be described with reference to FIGS.
- the circuit device 30i of the present embodiment has the same configuration as the circuit device 30 of the first embodiment, but mainly differs in the following points.
- the first heat transfer members 170 and 171 are provided on the first portion 51 of the first coil pattern 50 and the second portion 52 of the first coil pattern 50. It is further arranged on the top. Specifically, the first heat transfer member 170 is disposed on the first coil pattern 50 so as to connect the thermal via 81 and the thermal via 84a. The first heat transfer member 171 is disposed on the first coil pattern 50 so as to connect the thermal via 82 and the thermal via 84b.
- the radiator 6 may have a second recess 6 f that houses the first heat transfer members 170 and 171 on the second portion 52.
- the first heat transfer members 173 and 174 are provided on the third portion 56 of the second coil pattern 55 and the fourth portion 57 of the second coil pattern 55. It is further arranged on the top. Specifically, the first heat transfer member 173 is disposed on the second coil pattern 55 so as to connect the thermal via 81 and the thermal via 84a. The first heat transfer member 174 is disposed on the second coil pattern 55 so as to connect the thermal via 82 and the thermal via 84b.
- the circuit device 30 i may include second heat transfer members 140 and 140 a having electrical insulation between the radiator 6 and the first coil pattern 50.
- the second heat transfer members 140 and 140a of the present embodiment have the same configuration as the second heat transfer members 80 and 80a of the first embodiment, but are mainly different in the following points.
- the second heat transfer members 140 and 140a are arranged not only between the radiator 6 and the first coil pattern 50 but also between the radiator 6 and the first heat transfer members 170 and 171. .
- the second heat transfer members 140 and 140 a are in surface contact with the heat radiator 6 and the second portion 52 of the first coil pattern 50.
- the first coil pattern 50 is connected to the radiator 6 with a low thermal resistance via the second heat transfer members 140 and 140a.
- the second heat transfer members 140 and 140a are further in surface contact with the radiator 6 and the first heat transfer members 170 and 171.
- the first heat transfer members 170 and 171 are connected to the radiator 6 with low thermal resistance via the second heat transfer members 140 and 140a.
- the second heat transfer members 140 and 140 a may cover the surfaces of the first heat transfer members 170 and 171 exposed from the first coil pattern 50.
- the first heat transfer members 170 and 171 of the present embodiment are in contact with the first coil pattern 50 with a larger area than the first heat transfer members 70 and 71 of the first embodiment. Therefore, the electrical resistance of the part which consists of both the 1st heat-transfer members 170 and 171 and the 1st coil pattern 50 of this Embodiment is the 1st heat-transfer members 70 and 71 of Embodiment 1, and the 1st. It is lower than the electrical resistance of the part consisting of both of the coil pattern 50. According to the circuit device 30i of the present embodiment, the heat generated in the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be further reduced. .
- the heat resistance of the portion composed of both the first heat transfer members 170 and 171 and the first coil pattern 50 of the present embodiment is the same as that of the first heat transfer members 70 and 71 and the first coil of the first embodiment. It is lower than the thermal resistance of the part consisting of both patterns 50.
- the heat generated in the first portion 51 of the first coil pattern 50 is generated by the first portion 51 of the first coil pattern 50 and the first heat transfer member 170. , 171 and the second portion 52 of the first coil pattern 50 with a lower thermal resistance.
- the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is further suppressed. Can be done.
- the first heat transfer members 170 and 171 on the first coil pattern 50 may have a larger surface area than the first heat transfer members 70 and 71 of the first embodiment.
- the first heat transfer members 170 and 171 on the first coil pattern 50 transfer heat generated in the first portion 51 of the first coil pattern 50 to the second portion 52 of the first coil pattern 50. It can be spread with lower thermal resistance. Therefore, heat generated in the first portion 51 of the first coil pattern 50 is dissipated from the surfaces of the first heat transfer members 170 and 171 and the surface of the first coil pattern 50 to the surrounding atmosphere.
- the first heat transfer members 170 and 171 of the present embodiment are connected to the radiator 6 with a low thermal resistance. Specifically, the first heat transfer members 170 and 171 are in surface contact with the second heat transfer members 140 and 140 a, and the second heat transfer members 140 and 140 a are in surface contact with the radiator 6. Thus, the first heat transfer members 170 and 171 are thermally connected to the radiator 6 via the second heat transfer members 140 and 140a. Therefore, the heat generated in the first portion 51 of the first coil pattern 50 passes through the first heat transfer members 170 and 171 and the second heat transfer members 140 and 140a to the radiator 6 with lower thermal resistance. Can be communicated. As a result, according to the circuit device 30 i of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 is further suppressed. Can be done.
- the first heat transfer members 173 and 174 of the present embodiment are in contact with the second coil pattern 55 with a larger area than the first heat transfer members 73 and 74 of the first embodiment. Therefore, the electrical resistance of the portion composed of both the first heat transfer members 173 and 174 and the second coil pattern 55 of the present embodiment is the same as that of the first heat transfer members 73 and 74 and the second heat transfer members of the first embodiment. It is lower than the electrical resistance of the part consisting of both of the coil pattern 55. According to the circuit device 30 i of the present embodiment, the heat generated in the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is further reduced. obtain.
- the thermal resistance of the portion composed of both the first heat transfer members 173 and 174 and the second coil pattern 55 of the present embodiment is the same as that of the first heat transfer members 73 and 74 and the second coil of the first embodiment. It is lower than the thermal resistance of the portion composed of both of the patterns 55.
- the heat generated in the third portion 56 of the second coil pattern 55 is generated by the third portion 56 of the second coil pattern 55 and the first heat transfer member 173. , 174 and the fourth coil portion 55 of the second coil pattern 55 with a lower thermal resistance.
- the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is further suppressed. Can be done.
- the first heat transfer members 173 and 174 on the second coil pattern 55 may have a larger surface area than the first heat transfer members 73 and 74 of the first embodiment.
- the first heat transfer members 173 and 174 on the second coil pattern 55 transfer heat generated in the third portion 56 of the second coil pattern 55 to the fourth portion 57 of the second coil pattern 55. It can be spread with lower thermal resistance. Therefore, heat generated in the third portion 56 of the second coil pattern 55 is dissipated from the surfaces of the first heat transfer members 173 and 174 and the surface of the second coil pattern 55 to the surrounding atmosphere.
- the first heat transfer members 170 and 171 of the present embodiment are connected to the radiator 6 with a low thermal resistance. Therefore, the heat generated in the third portion 56 of the second coil pattern 55 is generated by the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first heat transfer members 170, 171 and the second heat transfer member. Through 140 and 140a, it can be transmitted to the radiator 6 with a lower thermal resistance. As a result, according to the circuit device 30 i of the present embodiment, the temperature rise of the third portion 56 of the second coil pattern 55 sandwiched between the first core portion 46 and the second core portion 47 is further suppressed. Can be done.
- the reason why the temperature increase in the portion sandwiched between the first core portion 46 and the second core portion 47 in the first internal coil pattern 61 can be further suppressed is as follows. This is the same as the reason why the temperature rise of the first portion 51 of the second coil pattern 50 and the third portion 56 of the second coil pattern 55 can be further suppressed.
- the first internal coil pattern is formed by the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first heat transfer members 170, 171, 173, 174, and the second heat transfer members 140, 140a.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 has a lower thermal resistance, the surface of the first heat transfer members 170, 171, 173, 174, the first It is dissipated from the surface of the first coil pattern 50, the surface of the second coil pattern 55 and the radiator 6 to the outside of the circuit device 30i.
- a temperature increase in a portion of the first internal coil pattern 61 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the reason why the temperature increase in the portion sandwiched between the first core portion 46 and the second core portion 47 in the second internal coil pattern 65 can be further suppressed is as follows. This is the same as the reason why the temperature rise of the first portion 51 of the second coil pattern 50 and the third portion 56 of the second coil pattern 55 can be further suppressed.
- the second internal coil pattern is formed by the thermal vias 81, 82, 83a, 83b, 84a, 84b, the first heat transfer members 170, 171, 173, 174, and the second heat transfer members 140, 140a.
- the heat generated in the portion sandwiched between the first core portion 46 and the second core portion 47 has a lower thermal resistance
- a temperature increase in a portion of the second internal coil pattern 65 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the circuit device 30i of this embodiment has the same effects as the circuit device 30 of the first embodiment, but differs mainly in the following points.
- the first heat transfer members 170, 171, 173, and 174 are further provided on at least one of the second portion 52 and the fourth portion of the first coil pattern 50. It may be arranged.
- the first heat transfer members 170, 171, 173, and 174 of the present embodiment are larger in area than the first heat transfer members 70, 71, 73, and 74 of the first embodiment and It contacts one of the second coil patterns 55.
- the first heat transfer members 170, 171, 173 and 174 may have a larger surface area than the first heat transfer members 70, 71, 73 and 74 of the first embodiment. According to the circuit device 30 i of the present embodiment, the temperature rise of at least one of the first portion 51 and the third portion 56 can be further suppressed.
- the circuit device 30i of the present embodiment may further include second heat transfer members 140 and 140a having electrical insulation between the radiator 6 and the first heat transfer members 170 and 171. Therefore, the heat generated in the first portion 51 of the first coil pattern 50 can be transmitted to the radiator 6 with a lower thermal resistance. According to the circuit device 30 i of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 can be further suppressed. Since the radiator 6 is electrically insulated from the first heat transfer members 170 and 171 by the second heat transfer members 140 and 140a, the radiator 6 and the first heat transfer members 170 and 171 are It can be made of a material having high thermal conductivity and high electrical conductivity such as metal.
- FIG. 11 The circuit device 30j according to the eleventh embodiment will be described with reference to FIGS.
- the circuit device 30j according to the present embodiment has the same configuration as the circuit device 30i according to the tenth embodiment, but mainly differs in the following points.
- the first heat transfer member 272 is further disposed on the second portion 52 of the first coil pattern 50. Specifically, the first heat transfer member 272 may extend along the longitudinal direction of the first coil pattern 50 on the second portion 52 of the first coil pattern 50. The first heat transfer member 272 may be disposed between the attachment member 77a and the attachment member 77b. The first heat transfer member 272 may be disposed on the first coil pattern 50 so as to connect the thermal via 84a and the thermal via 84b.
- the first heat transfer member 270 is disposed on the first coil pattern 50 so as to connect one end of the first coil pattern 50 and the first portion 51 of the first coil pattern 50. ing.
- the first heat transfer member 270 is disposed on the first coil pattern 50 so as to connect the thermal via 81 and the thermal via 83a.
- the first heat transfer member 270 may protrude from the core 45 toward the thermal via 84a in plan view from a direction perpendicular to the first main surface 40a.
- the first heat transfer member 271 is disposed on the first coil pattern 50 so as to connect the other end of the first coil pattern 50 and the first portion 51 of the first coil pattern 50. ing.
- the first heat transfer member 271 is disposed on the first coil pattern 50 so as to connect the thermal via 82 and the thermal via 83b.
- the first heat transfer member 271 may protrude from the core 45 toward the thermal via 84b in a plan view from a direction perpendicular to the first main surface 40a.
- the first heat transfer members 270 and 271 on the first portion 51 of the first coil pattern 50 are separated from the first heat transfer members 272 on the second portion 52 of the first coil pattern 50. Alternatively, they may be integrated.
- the first heat transfer member 275 is further disposed on the fourth portion 57 of the second coil pattern 55. Specifically, the first heat transfer member 275 may extend along the longitudinal direction of the second coil pattern 55 on the fourth portion 57 of the second coil pattern 55. The first heat transfer member 275 may be disposed between the attachment member 77a and the attachment member 77b. The first heat transfer member 275 may be disposed on the second coil pattern 55 so as to connect the thermal via 84a and the thermal via 84b.
- the first heat transfer member 273 is disposed on the second coil pattern 55 so as to connect one end of the second coil pattern 55 and the third portion 56 of the second coil pattern 55. ing.
- the first heat transfer member 273 is disposed on the second coil pattern 55 so as to connect the thermal via 81 and the thermal via 83a.
- the first heat transfer member 273 may protrude from the core 45 toward the thermal via 84a in a plan view from a direction perpendicular to the second main surface 40b.
- the first heat transfer member 274 is disposed on the second coil pattern 55 so as to connect the other end of the second coil pattern 55 and the third portion 56 of the second coil pattern 55. ing.
- the first heat transfer member 274 is disposed on the second coil pattern 55 so as to connect the thermal via 82 and the thermal via 83b.
- the first heat transfer member 274 may protrude from the core 45 toward the thermal via 84b in a plan view from a direction perpendicular to the second main surface 40b.
- the first heat transfer members 273 and 274 on the third portion 56 of the second coil pattern 55 are separated from the first heat transfer member 275 on the fourth portion 57 of the second coil pattern 55. Alternatively, they may be integrated.
- the circuit device 30j according to the present embodiment has the same effects as the circuit device 30i of the tenth embodiment, but differs mainly in the following points.
- the first heat transfer members 270, 271, 272, 273, 274, and 275 have the first coil in at least one of the second portion 52 and the fourth portion 57. You may extend along the direction through which the electric current of at least one of the pattern 50 and the 2nd coil pattern 55 flows.
- the first heat transfer members 270, 271, 272, 273, 274, and 275 of the present embodiment have a larger area than the first heat transfer members 70, 71, 73, and 74 of the first embodiment. It contacts at least one of the coil pattern 50 and the second coil pattern 55.
- the first heat transfer members 270, 271, 272, 273, 274, and 275 on the first coil pattern 50 have a larger surface area than the first heat transfer members 70, 71, 73, and 74 of the first embodiment. You may have. According to the circuit device 30j of the present embodiment, a temperature increase in at least one of the first portion 51 and the third portion 56 can be further suppressed.
- the longitudinal direction of the first heat transfer member 272 and the longitudinal direction of the second heat transfer member 140 are along the direction in which the current of the first coil pattern 50 flows. Therefore, when the printed board 40 is attached to the radiator 6 using the attachment members 77a and 77b, the second heat transfer member 140 can be in contact with the first coil pattern 50 over a wide area. Further, the repulsive force in the longitudinal direction of the second heat transfer member 140 received by the printed circuit board 40 when the printed circuit board 40 is mounted to the radiator 6 using the mounting members 77 a and 77 b is short of the second heat transfer member 140. Greater than the repulsive force in the hand direction.
- the first heat transfer member 272 improves the rigidity of the printed circuit board 40, the first heat transfer member 272 prevents the printed circuit board 40 from warping due to the repulsive force from the second heat transfer member 140. be able to. Therefore, the second heat transfer member 80 can more reliably contact the first coil pattern 50 over a wide area. According to the circuit device 30j of the present embodiment, the temperature rise of the first coil pattern 50 can be further suppressed.
- the second heat transfer member 140 is crushed by the printed board 40 having the rigidity improved by the first heat transfer member 272. Can do.
- the second heat transfer member 140 crushed by the printed circuit board 40 has an even lower thermal resistance. According to the circuit device 30j of the present embodiment, the temperature rise of the first coil pattern 50 can be further suppressed.
- the first heat transfer member 272 on the second portion 52 of the first coil pattern 50 is the first heat transfer member 272 on the first portion 51 of the first coil pattern 50.
- the heat transfer members 270 and 271 may be separated. Even when the first coil pattern 50 has a complicated shape and the first heat transfer members 270 and 271 and the first heat transfer member 272 have a simple shape such as a rectangular parallelepiped, they are separated from each other. By combining the first heat transfer members 270 and 271 and the first heat transfer member 272, the first heat transfer members 270 and 271 and the first heat transfer member 272 are wide with the first coil pattern 50. Can be touched by area.
- the first heat transfer member 275 on the fourth portion 57 of the second coil pattern 55 is the first heat transfer member 275 on the third portion 56 of the second coil pattern 55.
- the heat transfer members 273 and 274 may be separated. Even when the second coil pattern 55 has a complicated shape and the first heat transfer members 273 and 274 and the first heat transfer member 275 have a simple shape such as a rectangular parallelepiped, they are separated from each other. Further, by combining the first heat transfer members 273 and 274 and the first heat transfer member 275, the first heat transfer members 273 and 274 and the first heat transfer member 275 are wide with the second coil pattern 55. Can be touched by area.
- FIG. A circuit device 30k according to the twelfth embodiment will be described with reference to FIGS.
- the circuit device 30k according to the present embodiment has the same configuration as the circuit device 30j according to the eleventh embodiment, but mainly differs in the following points.
- the first heat transfer member 270 includes a plurality of heat transfer portions 270a and 270b. Specifically, the first heat transfer member 270 is divided into a plurality of heat transfer portions 270 a and 270 b along the longitudinal direction of the first coil pattern 50.
- the heat transfer portion 270a is located on the outer side (first leg 47a side), and the heat transfer portion 270b is located on the inner side (second leg 47b side).
- the first heat transfer member 271 includes a plurality of heat transfer portions 271a and 271b. Specifically, the first heat transfer member 271 is divided into a plurality of heat transfer portions 271 a and 271 b along the longitudinal direction of the first coil pattern 50.
- the heat transfer portion 271a is located on the outer side (third leg portion 47c side), and the heat transfer portion 271b is located on the inner side (second leg portion 47b side).
- the first heat transfer member 272 includes a plurality of heat transfer portions 272a and 272b. Specifically, the first heat transfer member 272 is divided into a plurality of heat transfer portions 272 a and 272 b along the longitudinal direction of the first coil pattern 50. The heat transfer portion 272a is located on the outer side, and the heat transfer portion 272b is located on the inner side (second leg 47b side).
- the first heat transfer member 273 includes a plurality of heat transfer portions 273a and 273b. Specifically, the first heat transfer member 273 is divided into a plurality of heat transfer portions 273 a and 273 b along the longitudinal direction of the first coil pattern 50.
- the heat transfer portion 273a is located on the outer side (first leg portion 47a side), and the heat transfer portion 273b is located on the inner side (second leg portion 47b side).
- the first heat transfer member 274 includes a plurality of heat transfer portions 274a and 274b. Specifically, the first heat transfer member 274 is divided into a plurality of heat transfer portions 274 a and 274 b along the longitudinal direction of the first coil pattern 50.
- the heat transfer portion 274a is located on the outer side (third leg portion 47c side), and the heat transfer portion 274b is located on the inner side (second leg portion 47b side).
- the first heat transfer member 275 includes a plurality of heat transfer portions 275a and 275b. Specifically, the first heat transfer member 275 is divided into a plurality of heat transfer portions 275 a and 275 b along the longitudinal direction of the first coil pattern 50. The heat transfer portion 275a is located outside, and the heat transfer portion 275b is located inside (the second leg 47b side).
- the plurality of heat transfer portions 270a, 270b, 271a, 271b, 272a, 272b may be mounted on the first coil pattern 50 using solder.
- the plurality of heat transfer portions 273a, 273b, 274a, 274b, 275a, 275b may be mounted on the second coil pattern 55 using solder.
- the effect of the circuit device 30k according to the present embodiment will be described.
- the circuit device 30k according to the present embodiment has the same effects as the circuit device 30j according to the eleventh embodiment, but differs mainly in the following points.
- the first heat transfer member 270 includes a plurality of heat transfer portions 270a and 270b. Since the volume of each of the heat transfer portions 270a and 270b of the present embodiment is smaller than the volume of the first heat transfer member 270 of the eleventh embodiment, each of the heat transfer portions 270a and 270b of the present embodiment. Is smaller than the heat capacity of the first heat transfer member 270 of the eleventh embodiment. Therefore, the temperature of the surrounding atmosphere when soldering the plurality of heat transfer portions 270a and 270b to the first coil pattern 50 can be lowered.
- the heat at the time of solder reflow damages the printed circuit board 40, the core 45 and the components on the printed circuit board 40, and the printed circuit board 40, the core 45 and the printed circuit board 40. Can be prevented from breaking.
- the first heat transfer member 270 When soldering the first heat transfer member 270 to the first coil pattern 50, the flux contained in the solder is vaporized and becomes gas. This gas remains in the solder and voids are formed in the solder. This void reduces the bonding strength between the first heat transfer member 270 and the first coil pattern 50 and reduces the thermal resistance between the first heat transfer member 270 and the first coil pattern 50. increase.
- the first heat transfer member 270 includes a plurality of heat transfer portions 270a and 270b. Therefore, this gas escapes from between the heat transfer portion 270a and the heat transfer portion 270b to the surrounding atmosphere. The circuit device 30k of the present embodiment can suppress the formation of voids in the solder.
- the circuit device 30k according to the present embodiment suppresses a decrease in the bonding strength between the first heat transfer member 270 and the first coil pattern 50, and also the first heat transfer member 270 and the first heat transfer member 270. An increase in thermal resistance between the coil pattern 50 and the coil pattern 50 can be suppressed. According to the circuit device 30k of the present embodiment, the temperature rise of the first portion 51 of the first coil pattern 50 sandwiched between the first core portion 46 and the second core portion 47 can be suppressed.
- the first heat transfer member 271 includes a plurality of heat transfer portions 271a and 271b.
- the first heat transfer member 272 includes a plurality of heat transfer portions 272a and 272b.
- the first heat transfer member 273 includes a plurality of heat transfer portions 273a and 273b.
- the first heat transfer member 274 includes a plurality of heat transfer portions 274a and 274b.
- the first heat transfer member 275 includes a plurality of heat transfer portions 275a and 275b.
- the plurality of heat transfer portions 271a, 271b, 272a, 272b, 273a, 273b, 274a, 274b, 275a, 275b have the same effects as the plurality of heat transfer portions 270a, 270b.
- Embodiment 13 FIG. With reference to FIGS. 7 to 12 and FIGS. 95 to 97, a circuit device 30m according to the thirteenth embodiment will be described.
- the circuit device 30m of the present embodiment has the same configuration as the circuit device 30 of the first embodiment and has the same effects, but mainly differs in the following points.
- the circuit device 30m further includes third heat transfer members 150 and 151 between the core 45 and the first heat transfer members 70 and 71.
- the third heat transfer members 150 and 151 have a thermal conductivity larger than that of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40.
- the third heat transfer members 150 and 151 are more than twice the thermal conductivity of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40, more preferably. It may be 4 times or more.
- the third heat transfer members 150 and 151 may be crushed by the core 45 and the first heat transfer members 70 and 71.
- the third heat transfer members 150 and 151 crushed by the core 45 and the first heat transfer members 70 and 71 have an even lower thermal resistance.
- the third heat transfer members 150 and 151 may be silicone rubber sheets.
- the third heat transfer members 150 and 151 may have electrical insulation.
- the third heat transfer members 150 and 151 may be made of the same material as the second heat transfer members 80 and 80a.
- the circuit device 30m of the present embodiment further includes third heat transfer members 153 and 154 between the core 45 and the first heat transfer members 73 and 74.
- the third heat transfer members 153 and 154 have a thermal conductivity larger than that of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40.
- the third heat transfer members 153 and 154 are more than twice the thermal conductivity of the first base material layer 40c, the second base material layer 40d, and the third base material layer 40e of the printed circuit board 40, more preferably It may be 4 times or more.
- the third heat transfer members 153 and 154 may be crushed by the core 45 and the first heat transfer members 73 and 74.
- the third heat transfer members 153 and 154 may be silicone rubber sheets.
- the third heat transfer members 153 and 154 may have electrical insulation.
- the third heat transfer members 153 and 154 may be made of the same material as the second heat transfer members 80 and 80a.
- the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. For example, as long as there is no contradiction, at least two of the technical matters disclosed this time may be combined.
- the circuit configuration of the coil pattern may be arbitrarily changed.
- the second core portion 47 is disposed on the first core portion 46, but the first core portion 46 is disposed on the second core portion 47. Also good.
- the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
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Abstract
Description
図1を参照して、本実施の形態の電力変換装置1の回路構成の一例を説明する。本実施の形態の電力変換装置1は、自動車用のDC-DCコンバータであってもよい。電力変換装置1は、入力端子10と、入力端子10に接続されるインバータ回路11と、インバータ回路11に接続されるトランス19と、トランス19に接続される整流回路14と、整流回路14に接続される平滑回路16と、平滑回路16に接続される出力端子20とを備える。
本実施の形態の回路装置30及び電力変換装置1は、プリント基板40と、コア45とを備える。プリント基板40は、第1の主面40aと、第1の主面40aと反対側の第2の主面40bとを有する。コア45は、第1の主面40aの上に第1の主面40aから離れて位置する第1のコア部46と、第2の主面40bの上に第2の主面40bから離れて位置する第2のコア部47とを含む。コア45は、第1の主面40aと第2の主面40bとの間を貫通する貫通部(47b)を含む。プリント基板40は、第1の主面40aの上に配置された第1のコイルパターン50及び第2の主面40bの上に配置された第2のコイルパターン55の少なくともいずれかを含む。第1のコイルパターン50及び第2のコイルパターン55の少なくともいずれかはコア45の貫通部(47b)を半ターン以上囲む。第1のコイルパターン50は、第1のコア部46と第2のコア部47とに挟まれる第1の部分51と、第1の主面40aに垂直な方向からの平面視において第1のコア部46及び第2のコア部47の少なくとも1つから露出する第2の部分52とを含む。第2のコイルパターン55は、第1のコア部46と第2のコア部47とに挟まれる第3の部分56と、第2の主面40bに垂直な方向からの平面視において第1のコア部46及び第2のコア部47の少なくとも1つから露出する第4の部分57とを含む。
図16から図26を参照して、実施の形態2の回路装置30aを説明する。本実施の形態の回路装置30aは、実施の形態1の回路装置30と同様の構成を備えるが、主に以下の点で異なる。
図27から図37を参照して、実施の形態3の回路装置30bを説明する。本実施の形態の回路装置30bは、実施の形態2の回路装置30aと同様の構成を備えるが、主に以下の点で異なる。
図19、図24、図38から図43を参照して、実施の形態4の回路装置30cを説明する。本実施の形態の回路装置30cは、実施の形態2の回路装置30aと同様の構成を備えるが、主に以下の点で異なる。
図44から図54を参照して、実施の形態5の回路装置30dを説明する。本実施の形態の回路装置30dは、実施の形態2の回路装置30aと同様の構成を備え、同様の効果を奏するが、主に以下の点で異なる。
図55から図65を参照して、実施の形態6の回路装置30eを説明する。本実施の形態の回路装置30eは、実施の形態2の回路装置30aと同様の構成を備えるが、主に以下の点で異なる。
図7、図8、図11、図12、図66から図69を参照して、実施の形態7の回路装置30fを説明する。本実施の形態の回路装置30fは、実施の形態1の回路装置30と同様の構成を備えるが、主に以下の点で異なる。
図70から図77を参照して、実施の形態8の回路装置30gを説明する。本実施の形態の回路装置30gは、実施の形態7の回路装置30fと同様の構成を備えるが、主に以下の点で異なる。
図78から図83を参照して、実施の形態9の回路装置30hを説明する。本実施の形態の回路装置30hは、実施の形態8の回路装置30gと同様の構成を備えるが、主に以下の点で異なる。
図84から図86を参照して、実施の形態10の回路装置30iを説明する。本実施の形態の回路装置30iは、実施の形態1の回路装置30と同様の構成を備えるが、主に以下の点で異なる。
図8から図11及び図87から図90を参照して、実施の形態11の回路装置30jを説明する。本実施の形態の回路装置30jは、実施の形態10の回路装置30iと同様の構成を備えるが、主に以下の点で異なる。
図8から図11及び図91から図94を参照して、実施の形態12の回路装置30kを説明する。本実施の形態の回路装置30kは、実施の形態11の回路装置30jと同様の構成を備えるが、主に以下の点で異なる。
図7から図12及び図95から図97を参照して、実施の形態13の回路装置30mを説明する。本実施の形態の回路装置30mは、実施の形態1の回路装置30と同様の構成を備え、同様の効果を奏するが、主に以下の点で異なる。
Claims (18)
- 第1の主面と、前記第1の主面と反対側の第2の主面とを有するプリント基板と、
コアとを備え、前記コアは、前記第1の主面の上に前記第1の主面から離れて位置する第1のコア部と、前記第2の主面の上に前記第2の主面から離れて位置する第2のコア部とを含み、前記コアは、前記第1の主面と前記第2の主面との間を貫通する貫通部を含み、
前記プリント基板は、前記第1の主面の上に配置された第1のコイルパターン及び前記第2の主面の上に配置された第2のコイルパターンの少なくともいずれかを含み、前記第1のコイルパターン及び前記第2のコイルパターンの前記少なくともいずれかは前記コアの前記貫通部を半ターン以上囲み、
前記第1のコイルパターンは、前記第1のコア部と前記第2のコア部とに挟まれる第1の部分と、前記第1の主面に垂直な方向からの平面視において前記第1のコア部及び前記第2のコア部の少なくとも1つから露出する第2の部分とを含み、
前記第2のコイルパターンは、前記第1のコア部と前記第2のコア部とに挟まれる第3の部分と、前記第2の主面に垂直な方向からの平面視において前記第1のコア部及び前記第2のコア部の少なくとも1つから露出する第4の部分とを含み、さらに、
前記第1の部分及び前記第3の部分の少なくともいずれかの上に第1の伝熱部材を備え、
前記第1の伝熱部材は、前記第1の部分及び前記第3の部分の前記少なくともいずれかに取り付けられており、
前記第1のコイルパターン及び前記第2のコイルパターンの前記少なくともいずれかの電流が流れる方向に交差する断面において、前記第1の伝熱部材は、前記第1の部分及び前記第3の部分の前記少なくともいずれかより大きな断面積を有する、回路装置。 - 前記第1の伝熱部材は、前記第2の部分及び前記第4の部分の少なくともいずれかの上にさらに配置される、請求項1に記載の回路装置。
- 前記第1の伝熱部材は、前記第2の部分及び前記第4の部分の前記少なくともいずれかにおいて、前記第1のコイルパターン及び前記第2のコイルパターンの前記少なくともいずれかの前記電流が流れる前記方向に沿って延在する、請求項2に記載の回路装置。
- 前記第1の伝熱部材は、複数の伝熱部分で構成されている、請求項1から請求項3のいずれか1項に記載の回路装置。
- 前記第2の部分及び前記第4の部分の少なくともいずれかに熱的に接続された放熱器をさらに備える、請求項1から請求項4のいずれか1項に記載の回路装置。
- 前記放熱器は、前記プリント基板を収容する筐体の一部を構成する、請求項5に記載の回路装置。
- 電気的絶縁性を有する第2の伝熱部材をさらに備え、
前記プリント基板は、前記第1のコイルパターンを含み、
前記第2の伝熱部材は、前記放熱器と前記第1のコイルパターンとの間に配置される、請求項5または請求項6に記載の回路装置。 - 前記放熱器と前記第1の伝熱部材との間に、電気的絶縁性を有する第2の伝熱部材をさらに備える、請求項5または請求項6に記載の回路装置。
- 前記プリント基板を前記放熱器に取り付ける複数の取付部材をさらに備え、
前記プリント基板は、前記第1のコイルパターンを含み、
前記複数の取付部材は、前記第2の伝熱部材を挟むように、前記第2の伝熱部材の長手方向に沿って配置され、
前記第2の伝熱部材の前記長手方向は、前記第1のコイルパターンの前記電流が流れる前記方向に沿っている、請求項7または請求項8に記載の回路装置。 - 前記プリント基板は、前記第1のコイルパターンと、前記第2のコイルパターン及び前記プリント基板の内部の第3のコイルパターンの少なくとも1つとを含み、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つは前記コアの前記貫通部を半ターン以上囲み、
前記プリント基板は、サーマルビアを含み、
前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つを、前記第1のコイルパターンに接続する、請求項1から請求項9のいずれか1項に記載の回路装置。 - 前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つを、前記第1のコイルパターンの前記第1の部分に接続する、請求項10に記載の回路装置。
- 前記第1のコイルパターンは、前記第1のコイルパターンの電流経路から外れた位置に、前記第1のコイルパターンの一部を拡張した第1の拡張部を含み、
前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つを、前記第1のコイルパターンの前記第1の拡張部に接続する、請求項10に記載の回路装置。 - 前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの電流経路から外れた位置に、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの一部を拡張した第2の拡張部を含み、
前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの前記第2の拡張部を、前記第1のコイルパターンの前記第1の拡張部に接続する、請求項12に記載の回路装置。 - 前記プリント基板は、前記第1のコイルパターンと、前記第1の主面の上に前記第1のコイルパターンから離れて配置される第1のサーマルパッドとを含み、
前記第1のサーマルパッドは前記放熱器に熱的に接続される、請求項5から請求項9のいずれか1項に記載の回路装置。 - 前記プリント基板は、前記第2のコイルパターン及び前記プリント基板の内部の第3のコイルパターンの少なくとも1つを含み、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つは前記コアの前記貫通部を半ターン以上囲み、
前記プリント基板は、サーマルビアを含み、
前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つを、前記第1のサーマルパッドに接続する、請求項14に記載の回路装置。 - 前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの電流経路から外れた位置に、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの一部を拡張した第2の拡張部を含み、
前記サーマルビアは、前記第2のコイルパターン及び前記第3のコイルパターンの前記少なくとも1つの前記第2の拡張部を、前記第1のサーマルパッドに接続する、請求項15に記載の回路装置。 - 前記コアと前記第1の伝熱部材との間に、第3の伝熱部材をさらに備える、請求項1から請求項16のいずれか1項に記載の回路装置。
- 請求項1から請求項17のいずれか1項に記載の前記回路装置と、
前記回路装置に接続されるスイッチング素子とを備える、電力変換装置。
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