WO2020026641A1 - Inducteur, inducteur composite, convertisseur cc/cc, et circuit - Google Patents

Inducteur, inducteur composite, convertisseur cc/cc, et circuit Download PDF

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Publication number
WO2020026641A1
WO2020026641A1 PCT/JP2019/024706 JP2019024706W WO2020026641A1 WO 2020026641 A1 WO2020026641 A1 WO 2020026641A1 JP 2019024706 W JP2019024706 W JP 2019024706W WO 2020026641 A1 WO2020026641 A1 WO 2020026641A1
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Prior art keywords
conductor
inductor
current
hole
core
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PCT/JP2019/024706
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English (en)
Japanese (ja)
Inventor
幸伯 山田
圭司 田代
有吉　剛
裕典 岡川
Original Assignee
住友電気工業株式会社
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Priority claimed from JP2018192845A external-priority patent/JP2021180199A/ja
Application filed by 住友電気工業株式会社 filed Critical 住友電気工業株式会社
Publication of WO2020026641A1 publication Critical patent/WO2020026641A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • 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

Definitions

  • the present disclosure relates to an inductor, a composite inductor, a DC / DC converter, and a circuit.
  • This application claims the priority based on Japanese Patent Application No. 2018-142502 filed on Jul. 30, 2018 and the priority based on Japanese Patent Application No. 2018-192845 filed on Oct. 11, 2018. All the contents described in the above are used.
  • DC / DC converters for raising and lowering a DC voltage are widely used as power supplies for in-vehicle equipment and industrial equipment. Converters are classified into an insulated type and a non-insulated type depending on whether or not the input and output are insulated by a transformer. The control method of the insulated converter is divided into a forward method and a flyback method.
  • a single choke coil (inductor) having a winding wound around a core is interposed on the high potential side of a secondary circuit through which an output current flows (Japanese Patent Application Laid-Open No. H11-163873). 1).
  • An inductor includes a core having a first through-hole, a portion inserted into the first through-hole, a first conductor through which a first current flows, and a first conductor passing through the first through-hole. And a second conductor through which a second current flows, wherein one of the first current and the second current is generated when the other current passes through the outside of the inductor.
  • the direction of the first current and the second current in the first through hole, which is the current returning to the inductor, is the same as the direction of the first through hole.
  • a composite inductor according to an aspect of the present disclosure is a composite inductor including the above-described inductor, and includes a plurality of the cores in which the first conductor and the second conductor are inserted into the first through-hole.
  • a DC / DC converter includes the above-described inductor or composite inductor, a switching element, and a transformer having a primary winding connected in series to the switching element, wherein the first conductor includes: An outflow current flowing out of the secondary winding of the transformer to the outside is connected so as to flow as the first current, and the second conductor is a return current returning to the secondary winding from the outside flows as the second current. Connected.
  • the present application can be realized not only as an inductor, a composite inductor, and a DC / DC converter having such a characteristic configuration, but also as a part of the DC / DC converter as a semiconductor integrated circuit, Or may be implemented as a composite inductor or other system including a DC / DC converter.
  • FIG. 1 is a block diagram illustrating a configuration example of the DC / DC converter according to the first embodiment.
  • FIG. 2 is an explanatory diagram illustrating an example of an operation state during a period in which power is transmitted from the primary side to the secondary side of the transformer.
  • FIG. 3 is an explanatory diagram illustrating an example of an operation state during a period in which the load current flows back on the secondary side of the transformer.
  • FIG. 4 is a perspective view of the inductor according to the first embodiment as viewed obliquely from above.
  • FIG. 5 is a cross-sectional view taken along line VV of FIG. 4, and is a longitudinal cross-sectional view schematically illustrating a state after the inductor according to the first embodiment is assembled.
  • FIG. 5 is a cross-sectional view taken along line VV of FIG. 4, and is a longitudinal cross-sectional view schematically illustrating a state after the inductor according to the first embodiment is assembled.
  • FIG. 6 is a perspective view of the inductor according to the second embodiment as viewed obliquely from above.
  • FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6, and is a longitudinal cross-sectional view schematically illustrating a state after assembly of the inductor according to the second embodiment.
  • FIG. 8A is a plan view showing a first conductor inserted into both of the through holes according to the second embodiment.
  • FIG. 8B is a plan view illustrating the second conductor inserted into both of the through holes according to the second embodiment.
  • FIG. 9A is a plan view showing the first conductor inserted into all of the through holes according to the first modification.
  • FIG. 9B is a plan view showing the second conductor inserted through all of the through holes according to the first modification.
  • FIG. 10A is a plan view schematically illustrating a first conductor according to Modification Example 2.
  • FIG. 10B is a plan view schematically showing a second conductor according to Modification 2.
  • FIG. 13 is a perspective view of an inductor according to Modification Example 3 as viewed obliquely from above. It is a side view which shows the inductor attached to the housing
  • FIG. 11 is a block diagram illustrating a configuration example of a DC / DC converter according to a third embodiment.
  • FIG. 13 is a plan view schematically showing a transformer and an inductor formed on a printed wiring board of the DC / DC converter according to the third embodiment.
  • FIG. 13 is a plan view schematically illustrating a transformer and an inductor formed on a printed wiring board of the DC / DC converter according to the fourth embodiment.
  • FIG. 16A is a graph illustrating frequency components of switching noise caused by the DC / DC converter according to the second embodiment.
  • FIG. 16B is a graph illustrating frequency components of switching noise caused by the DC / DC converter according to the fourth embodiment.
  • FIG. 17 is a circuit diagram illustrating a configuration example of a DC / DC converter according to the fifth embodiment.
  • the inductor is interposed on the high voltage side of the secondary circuit. Since the magnitude of the inductance required for this inductor is inversely proportional to the switching frequency at which the switch is turned on / off, the switching frequency must be relatively high in order to reduce the size of the inductor.
  • An inductor includes a core having a first through-hole, a first conductor having a portion inserted through the first through-hole, and through which a first current flows; A second conductor having a portion inserted through the through-hole and through which a second current flows, wherein one of the first current and the second current is connected to the outside of the inductor by the other current. And the direction of the first current and the second current in the first through-hole is the same as the direction of the penetration of the first through-hole.
  • the core has the first through hole formed therein.
  • the first conductor and the second conductor inserted into the first through-hole are connected to the outside such that the first current and the second current flow in the same direction as the direction in which the first through-hole penetrates.
  • the core further includes a second through-hole penetrating in the same direction as the first through-hole, the first conductor further includes a portion inserted through the second through-hole, The two conductor further has a portion inserted into the second through-hole, and the directions of the first current and the second current in the second through-hole are relative to a direction in which the second through-hole passes.
  • the directions of the first current and the second current in the first through hole are opposite to each other.
  • the core may include three or more through holes.
  • the first through-hole and the second through-hole whose through directions are aligned in the same direction are formed in the core.
  • the directions of the first current and the second current in the second through-hole are configured to be opposite to the directions of the first current and the second current in the first through-hole.
  • the first conductor has a first U-shaped portion, and the first U-shaped portion includes the portion where the first conductor is inserted into the first through hole and the second through hole. It is preferable to include the above-mentioned part penetrated.
  • the portions inserted into the first through-hole and the second through-hole and the portions connecting these portions are U-shaped.
  • the conductor has a relatively simple shape that is point-symmetric or line-symmetric in plan view.
  • the second conductor has a second U-shaped portion disposed so as to be opposite to the first U-shaped portion, and the second U-shaped portion is formed of the second conductor. Preferably includes the portion inserted through the first through-hole and the portion inserted through the second through-hole.
  • the U-shaped portions of the first conductor and the second conductor are configured to be opposite to each other. Accordingly, one end and the other end of the first conductor and the second conductor are separated from each other on both sides in the through direction of the through hole, so that connection to the outside is facilitated.
  • the core is preferably any of EE type, EI type and ER type.
  • any of the EE type, EI type and ER type cores having two through holes in abutted state is used, so that widely used cores can be used.
  • each of the first conductor and the second conductor has a rectangular cross section.
  • the cross section of each of the first conductor and the second conductor is rectangular, the thickness of the cross section in the short side direction can be suppressed. Further, since the surface area with respect to the cross-sectional area of each of the first conductor and the second conductor is large, heat dissipation is good.
  • the first conductor and the second conductor are conductor patterns included in different layers of a multilayer wiring board.
  • the conductor patterns included in different inner layers or outer layers of the multilayer wiring board are used as the first conductor and the second conductor, the first conductor and the second conductor including the peripheral circuit can be easily formed. Can be formed.
  • the core is a ferrite core or a magnetic material dust core.
  • the ferrite core is formed by sintering a magnetic material.
  • the dust core is formed by pressing powder containing a magnetic material.
  • the core is a ferrite core or a dust core, high-frequency characteristics are good.
  • the core may be a nanocrystalline soft magnetic material core or an amorphous core.
  • the inductor preferably further includes a heat transfer layer containing a heat transfer material.
  • the heat transfer layer Between the first conductor and the second conductor, and It is preferable that the core is disposed on at least one of the first and second conductors and the core.
  • the heat transfer material is interposed between the pair of conductors and / or between the pair of conductors and the core, the heat generated in the conductors passes through holes. Heat is transferred to the outside.
  • the core includes a pair of core members that can abut each other, and that the first through hole penetrates in a direction along the abutting surface in a state where the pair of the core members abut each other. .
  • a composite inductor according to an aspect of the present disclosure is a composite inductor including the above-described inductor, and includes a plurality of the cores each having the first conductor and the second conductor inserted through the first through hole. Prepare.
  • the size of each core can be reduced.
  • the inductor formed by inserting the first conductor and the second conductor into the first through hole and the second through hole of the core is regarded as a two-terminal pair circuit including two inductance elements.
  • Each two-terminal pair circuit is cascaded.
  • the overall transmission characteristics are derived based on the transmission characteristics of each two-port pair circuit.
  • a capacitor is connected to one terminal pair in at least one of the two-terminal pair circuits.
  • a DC / DC converter includes the above-described inductor, a switching element, and a transformer having a primary winding connected in series to the switching element. An outflow current flowing out of the secondary winding of the transformer to the outside is connected so as to flow as the first current, and the second conductor is a return current returning from the outside to the secondary winding as the second current. Connected.
  • the switching element is connected in series to the primary winding of the transformer, and the outflow current and return current to the secondary winding of the transformer flow through the first and second conductors of the inductor.
  • a DC / DC converter includes the above-described composite inductor, a switching element, and a transformer having a primary winding connected in series to the switching element.
  • the current flowing out of the secondary winding of the transformer to the outside is connected as the first current, and the second conductor is connected to the return current returning from the outside to the secondary winding by the second current. Connected as flowing.
  • the switching element is connected in series to the primary winding of the transformer, and the outflow current and return current to the secondary winding of the transformer flow through the first conductor and the second conductor of the composite inductor.
  • the first conductor is formed integrally with the secondary winding, and at least one of the first conductor and the second conductor is formed integrally with an output-side electric path. Is preferred.
  • the first conductor is formed integrally with the secondary winding of the transformer, and at least one of the first conductor and the second conductor is formed integrally with the output-side electric circuit.
  • the number of joints between components can be reduced.
  • both the first conductor and the second conductor may be formed integrally with the electric circuit on the output side.
  • a DC / DC converter includes the above-described inductor, a switching element, and a transformer having a primary winding, and at least the switching element, the inductor, and the primary winding. And are connected in series.
  • a circuit according to one embodiment of the present disclosure includes the above-described inductor, and a circuit element connected in series to the first conductor and the second conductor outside the inductor.
  • the first conductor, the circuit element, and the second conductor are connected in series, one of the first current and the second current flows through the circuit element. Passing it becomes the second current.
  • FIG. 1 is a block diagram illustrating a configuration example of the DC / DC converter 100 according to the first embodiment.
  • the DC / DC converter 100 includes a transformer 10, and the potential of the input-side terminals A and B and the potential of the output-side terminals C and D are separated by the transformer 10.
  • a capacitor 20 is connected between the terminals A and B on the input side, and a predetermined voltage is applied from an external DC power supply (not shown).
  • a capacitor 21 is connected between the output side terminals C and D, and an external load is further connected.
  • the terminal D is connected to, for example, the ground potential.
  • the DC / DC converter 100 also includes an Nch-type MOSFET (Metal Oxide Semiconductor Connector Field Effect Transistor: hereinafter referred to as an FET) 31 (corresponding to a switching element) connected between one end of the primary winding 11 of the transformer 10 and the terminal B. ), A series circuit of the FET 32 and the capacitor 22 connected between one end of the primary winding 11 and the terminal A, and a control unit 4 for controlling on / off of the FETs 31 and 32. The other end of the primary winding 11 is connected to the terminal A.
  • the FETs 31 and 32 may be other switching elements such as a bipolar transistor and an IGBT (Insulated Gate Bipolar Transistor).
  • the FET 31 has a drain connected to one end of the primary winding 11, a source connected to the terminal B, and a gate connected to the control unit 4.
  • the FET 32 has a drain connected to one end of the capacitor 22, a source connected to one end of the primary winding 11, and a gate connected to the control unit 4.
  • the other end of the capacitor 22 is connected to the terminal A.
  • Each of the FETs 31 and 32 has a body diode connected in anti-parallel at both ends. The order in which the FET 32 and the capacitor 22 constituting the active clamp circuit are connected in series may be changed.
  • the secondary winding 12 of the transformer 10 has one end connected to the cathode of the diode 51 and the other end connected to the cathode of the diode 52.
  • the cathode of the diode 52 is further connected to one end of the capacitor 21 and the terminal C via a conductor 61 included in the inductor 6 as a choke coil.
  • the anodes of the diodes 51 and 52 are connected to the other end of the capacitor 21 and the terminal D via a conductor 62 included in the inductor 6.
  • the inductor 6 is integrated including the pair of cores and the conductors 61 and 62.
  • the inductor 6 is represented as if a coil is wound around a core.
  • the conductors 61 and 62 correspond to the coil. Details of the inductor 6 will be described later.
  • the DC / DC converter 100 having the above-described configuration is a so-called single-rock type forward converter, and multiplies a predetermined voltage supplied from the terminals A and B by ⁇ (duty ratio of the FET 31) / (turn ratio of the transformer 10) ⁇ . Are output from terminals C and D.
  • the DC / DC converter 100 is not limited to a single-stone type, and may be any of a multi-stone type push-pull type, a half-bridge type, and a full-bridge type. The description of the example of the multiple stone type is omitted since the type itself is known.
  • voltage conversion is performed by performing PWM (Pulse Width Modulation) control on the FET 31 at a predetermined cycle. Therefore, the voltage conversion operation of the DC / DC converter 100 will be described first. 2 and 3, the illustration of the capacitor 20, the control unit 4, and the terminals C and D is omitted.
  • PWM Pulse Width Modulation
  • FIG. 2 is an explanatory diagram illustrating an example of an operation state during a period in which power is transmitted from the primary side to the secondary side of the transformer 10.
  • the FET 31 is turned on and the FET 32 is turned off under the control of the control unit 4.
  • a predetermined voltage is applied to the primary winding 11 of the transformer 10 from the terminals A and B to induce a constant voltage in the secondary winding 12, the diode 51 conducts, and the load current that increases linearly in the inductor 6. Flows.
  • a current (substantial output current) flowing from the secondary winding 12 (corresponding to a predetermined current source) to the capacitor 21 and the load via the conductor 61 is set as an outflow current, and the conductor 62 is transferred from the capacitor 21 and the load.
  • Current flowing through a so-called return path that returns to the secondary winding 12 via the control circuit is defined as a return current. The magnitudes of the outflow current and the return current are the same.
  • a current obtained by adding the load current (more precisely, the current obtained by dividing the magnitude of the load current on the secondary side by the turns ratio of the transformer 10) and the exciting current is applied to the primary winding 11 in a straight line. Flows to increase gradually.
  • the magnetic flux due to the load current flowing through each of the primary winding 11 and the secondary winding 12 cancels each other, while the exciting current creates a magnetic flux in the core of the transformer 10.
  • the capacitor 22 is charged with a voltage that makes the drain side of the FET 32 positive until the current PWM cycle.
  • a case where the potential of the other end is higher than the one end of the primary winding 11 is defined as a positive voltage.
  • the current flowing from the other end of the primary winding 11 to one end is defined as a positive current.
  • FIG. 3 is an explanatory diagram showing an example of an operation state during a period in which the load current flows on the secondary side of the transformer 10.
  • the FET 31 is turned off, the load current and the exciting current stop flowing through the FET 31, and the positive exciting current commutates to the body diode of the FET 32 (see the solid line).
  • the commutated exciting current decreases linearly, the capacitor 22 is charged while the direction of the exciting current is positive.
  • the load current flowing through one secondary winding 12 via the diode 51 flows back through the diode 52.
  • the FET 32 is turned on by the control of the control unit 4, and the exciting current flowing through the body diode of the FET 32 flows through the channel region, but the exciting current continues to decrease. Since a negative voltage is applied from the capacitor 22 to the primary winding 11 throughout the period shown in FIG. 3, the exciting current decreases linearly and the polarity is inverted from positive to negative in the middle of the entire period. (See broken line). At this time, the capacitor 22 starts discharging. Then, at the end of the period in which the FET 32 is on, the release of the energy stored in the transformer 10 ends. The load current on the secondary side of the transformer 10 continues to flow back through the diode 52.
  • FIG. 4 is a perspective view of the inductor 6 according to the first embodiment viewed obliquely from above
  • FIG. 5 is a longitudinal sectional view schematically illustrating a state after the assembly of the inductor 6 according to the first embodiment.
  • a through hole 60 is formed along a mating surface XX of a pair of cores 63 and 64 having a U-shaped cross section, and the pair of conductors 61 and 62 overlap the through hole 60.
  • One of the pair of conductors 61, 62 is referred to as a first conductor 61, and the other is referred to as a second conductor 62.
  • the vertical relationship between the conductors 61 and 62 may be opposite to that shown in FIGS.
  • a current flowing through the first conductor 61 is called a first current
  • a current flowing through the second conductor 62 is called a second current.
  • the first current is an outflow current
  • the second current is a return current.
  • the second current is a current in which the first current returns to the inductor 6 via a load which is a circuit element outside the inductor 6.
  • the first current may be considered to be a current that returns to the inductor 6 via the secondary winding 12 or the diode 52 that is a circuit element outside the inductor 6.
  • the cores (magnetic cores) 63 and 64 include a magnetic material.
  • the cores 63 and 64 are configured by abutting a pair of core members 63 and 64.
  • One of the pair of core members 63 and 64 is referred to as a first core member 63, and the other is referred to as a second core member.
  • the first core member 63 may be simply referred to as a core 63
  • the second core member 64 may be simply referred to as a core 64.
  • the pair of core members 63 and 64 may be referred to as a pair of cores 63 and 64.
  • the pair of cores 63 and 64 may have any shape in cross section and outer shape as long as a through hole is formed by abutting the cores.
  • the conductors 61 and 62 are rectangular copper wires or bus bars having a rectangular cross section, and the aspect ratio (the ratio of the long side to the short side) is, for example, in the range of 2: 1 to 20: 1. It is not limited. By thus increasing the aspect ratio by making the cross section rectangular, heat dissipation of the conductors 61 and 62 becomes easy.
  • the cores 63 and 64 are made of a powder compact formed by pressing a powder containing a ferrite or a magnetic material formed by sintering a magnetic material, the cores 63 and 64 have good high-frequency characteristics. That is, the cores 63 and 64 are ferrite cores or dust cores.
  • the material of the cores 63 and 64 is not limited to these, and may be, for example, a composite material containing a powder of a soft magnetic material and a resin, or may be a laminate in which plate-like magnetic materials are laminated.
  • the cores 63 and 64 may be nanocrystalline soft magnetic material cores or amorphous cores.
  • An insulating layer 65 is provided between the conductors 61 and 62.
  • An insulating layer 66 is provided between the conductors 61 and 62 and the cores 63 and 64.
  • the material of the insulating layers 65 and 66 is a heat dissipation material such as a silicon sheet, the heat dissipation of the conductors 61 and 62 is improved.
  • the heat transfer layers 67, 67 containing a heat transfer material such as a carbon sheet Is further provided.
  • a heat transfer layer (not shown) may be further provided between the conductors 61 and 62.
  • the conductors 61 and 62 are placed at positions where the through holes 60 are to be formed in the core 64 before butting the cores 63 and 64, and then the core 63 is butted against the core 64. Assembled.
  • the inductor 6 is connected to the peripheral circuit, it is considered that the outflow current flowing through the conductor 61 and the return current flowing through the conductor 62 flow in the same direction as the through-hole 60.
  • the applicable range and performance of the inductor 6 configured as described above will be described.
  • required inductance is inversely proportional to a switching frequency, and when the switching frequency is low, the coil cannot be replaced with a conductor having no winding shape. Therefore, in the first embodiment, it is assumed that the switching frequency of the FETs 31 and 32 by the control unit 4 is in the range of 300 kHz to 3 MHz, and that the inductance required for the inductor 6 is in the range of 0.1 ⁇ H to 3 ⁇ H.
  • the insulating layer 66 is disposed between the conductors 61 and 62 and the cores 63 and 64.
  • the cylindrical portion inserted into the through hole 60 and the two openings of the through hole 60 are formed.
  • the conductors 61 and 62 may be inserted through a bobbin made of an insulator having a flange-shaped flange along the opening surface. Further, the conductors 61 and 62 may be formed by conductor patterns in different inner layers or outer layers of the multilayer wiring board.
  • a part of the insulating layer 65 and the insulating layer 66 can be replaced with a prepreg containing epoxy resin and glass fiber, or a part of the insulating layer 66 can be replaced with a resist layer on the substrate surface.
  • the through-hole 60 is formed along the butting surface XX where the pair of cores 63 and 64 including the magnetic material is butted.
  • Conductors 61 and 62 are connected to peripheral circuits so that the outflow current from the secondary winding 12 of the transformer 10 and the return current to the secondary winding 12 flow in the same direction as the penetration direction of the through hole 60. It is connected.
  • the magnetomotive force F is doubled and the inductance is substantially quadrupled as compared with the case where one conductor is inserted into the through holes 60 of the cores 63 and 64. Therefore, even when the conductor inserted into the cores 63 and 64 is not wound, it is possible to secure necessary inductance.
  • the cross section of each of the pair of conductors 61 and 62 is rectangular, the thickness of the cross section in the short side direction can be suppressed, and the height of the inductor 6 can be suppressed. . Further, since the surface area with respect to the cross-sectional area of each of the pair of conductors 61 and 62 is large, the heat dissipation is improved.
  • the pair of conductors 61 and 62 including the peripheral circuit can be easily formed. Can be formed.
  • the ferrite or the compact is used as the material of the cores 63 and 64, the high frequency characteristics are good.
  • the heat transfer layers 67, 67 are interposed between the pair of conductors 61, 62 and the cores 63, 64, the heat generated in the conductors 61, 62 penetrates. Heat is preferably transferred to the outside of the hole 60.
  • a heat transfer layer is also provided between the pair of conductors 61 and 62, the heat transfer is further improved.
  • the FET 31 is connected in series to the primary winding 11 of the transformer 10, and the outflow current and the return current to the secondary winding 12 of the transformer 10 are each a pair of conductors 61 and 62 of the inductor 6. Flows to As a result, when the FET 31 is turned on / off, a current is induced in the secondary winding 12 of the transformer 10, and this current flows through the pair of conductors 61 and 62 of the inductor 6, thereby effectively reducing the output current. Can be smoothed.
  • one through hole 60 is formed in a state where a pair of cores 63 and 64 are abutted, whereas in the second embodiment, two through holes 60 are formed in a state where a pair of cores 63b and 64b are butted.
  • through holes 601 and 602 are formed. Since the block configuration of the DC / DC converter according to the second embodiment is the same as that of the DC / DC converter 100 according to the first embodiment, the illustration is omitted, and the portions corresponding to the first embodiment are denoted by the same reference numerals. The description is omitted.
  • FIG. 6 is a perspective view of the inductor 6b according to the second embodiment viewed obliquely from above
  • FIG. 7 is a vertical cross-sectional view schematically showing a state after the inductor 6b is assembled.
  • 8A and 8B are plan views respectively showing the conductors 61b and 62b inserted into both the through holes 601 and 602 according to the second embodiment.
  • FIG. 8A shows the first conductor 61b
  • FIG. 8B shows the second conductor 62b.
  • through holes 601 and 602 whose through directions are aligned in the same direction are formed along the abutting surfaces Xb-Xb of the EE-type cores 63b and 64b, and a pair of conductive holes are respectively formed in the through holes 601 and 602.
  • the bodies 61b and 62b are inserted so as to overlap each other.
  • the vertical relationship between the conductors 61b and 62b may be opposite to that shown in FIGS.
  • the pair of cores 63b and 64b may have another shape such as, for example, an EI type or an ER type.
  • the first conductor 61b has a first U-shaped portion 61bu including a portion inserted into the through holes 601 and 602 and a portion connecting these portions.
  • the second conductor 62b has a second U-shaped portion 62bu including a portion inserted into the through holes 601 and 602 and a portion connecting these portions.
  • portions including one end and the other end in the direction in which current flows are opposite to each other in a direction intersecting the through holes 601 and 602. Although it is bent, it may not be bent in this way.
  • the portions bent in this manner are referred to as one end and the other end.
  • the conductors 61b and 62b have a simple line-symmetric shape in plan view. Further, with respect to each of the conductors 61b and 62b, the current flowing through the portions inserted into the through holes 601 and 602 is necessarily in the opposite direction, and the magnetic flux cancels out in the core between the through holes 601 and 602. There is no. Therefore, if the size of the pair of cores 63b and 64b is substantially equal to the size of two pairs of the cores 63 and 64 according to the first embodiment arranged side by side, the inductance of the inductor 6b is substantially equal to the inductance of the inductor 6. Double.
  • An insulating layer 65 is provided between the conductors 61b and 62b.
  • An insulating layer 66 is provided between the conductors 61b and 62b and the cores 63b and 64b.
  • heat transfer layers 67, 67 are further provided between the conductors 61b, 62b and the insulating layer 66.
  • a heat transfer layer (not shown) may be further provided between the conductors 61b and 62b.
  • the conductors 61b and 62b are placed at positions where the through holes 601 and 602 are to be formed in the core 64b before the cores 63b and 64b are abutted. Are assembled together.
  • the inductor 6b is connected to a peripheral circuit, the outflow current flowing through the conductor 61b and the return current flowing through the conductor 62b flow in the same direction as the through direction of the through-hole 601 and pass through the through-hole 602. It is taken into consideration that the fluid flows in the same direction.
  • the U-shaped portions 61bu and 62bu are configured to be opposite to each other with respect to the direction in which the through holes 601 and 602 penetrate. Even if there is some change in the connection with the peripheral circuit, a similar effect can be obtained as the inductor 6b.
  • two through holes 601 and 602 whose through directions are aligned in the same direction along the abutting surface Xb-Xb of the cores 63b and 64b are formed in the cores 63b and 64b.
  • Each of one and the other of the pair of conductors 61b, 62b is configured such that currents flowing in portions inserted into two adjacent through holes 601 and 602 are in opposite directions. Therefore, the magnetic flux does not cancel out in the core between the adjacent through holes 601 and 602, and the inductance can be further increased substantially in proportion to the number of the through holes 601 and 602.
  • each of the pair of conductors 61b and 62b can have a relatively simple shape that is line-symmetric in plan view.
  • the U-shaped portions 61bu and 62bu of the pair of conductors 61b and 62b are configured to be opposite to each other. Therefore, one end and the other end of the pair of conductors 61b, 62b are separated on both sides in the through direction of the through holes 601 and 602, so that the connection with the secondary winding 12 and the terminals C and D is easily performed. be able to.
  • an EE-type, EI-type, or ER-type core having two through holes 601 and 602 in abutted state can be used.
  • Embodiment 2 is a mode in which two through holes 601 and 602 are formed in a state where a pair of cores 63b and 64b are abutted, whereas Modification 1 is a state where a pair of cores 63c and 64c are abutted.
  • three through holes 601, 602, and 603 are formed.
  • the configuration of the pair of cores 63c and 64c according to the first modification is the same as that of the second embodiment except that the through-holes 601, 602, and 603 are formed in the same direction. Detailed description is omitted.
  • the case where the number of through holes formed in the pair of cores is four or more is the same as in the case of the second embodiment or the first modification.
  • FIGS. 9A and 9B are plan views respectively showing the conductors 61c and 62c inserted into all of the through holes 601, 602, and 603 according to the first modification.
  • FIG. 9A shows the first conductor 61c
  • FIG. 9B shows the second conductor 62c.
  • the first conductor 61c includes a first U-shaped portion 61cu including a portion inserted into the through holes 601 and 602 and a portion connecting these portions, a portion inserted into the through holes 602 and 603, and these portions.
  • the two U-shaped portions 61cu partially overlap.
  • the second conductor 62c includes a second U-shaped portion 62cu including a portion inserted into the through holes 601 and 602 and a portion connecting these portions, a portion inserted into the through holes 602 and 603, and And a second U-shaped portion 62cu including a portion connecting the portions.
  • the conductors 61c and 62c have a simple point-symmetrical shape in plan view. Further, for each of the conductors 61c and 62c, the current flowing in the portion inserted into the adjacent through-holes 601 and 602 is necessarily in the opposite direction, and the magnetic flux cancels out in the core between the through-holes 601 and 602. It doesn't fit. Similarly, the currents flowing in the portions inserted into the adjacent through holes 602 and 603 are necessarily in opposite directions, and the magnetic flux does not cancel out in the core between the through holes 602 and 603.
  • the inductance of the inductor according to the first modification is the same as that of the first embodiment. This is approximately three times the inductance of the inductor 6 according to (1).
  • the corresponding U-shaped portions 61cu and 62cu are configured to be opposite to each other, so that one ends of the conductors 61c and 62c and the other ends of the conductors 61c and 62c are opposite to each other. These are separated from each other on both sides of the through-holes 601, 602, and 603 in the direction of penetration, so that connection with peripheral circuits is facilitated.
  • an electric path from the other end of the secondary winding 12 is connected to one end of the conductor 61c, and one end of the conductor 62c is connected to anodes of the diodes 51 and 52.
  • the other end of the conductor 61c is connected to the electric path to the terminal C, and the electric path from the terminal D is connected to the other end of the electric conductor 62c.
  • three through holes 601, 602, and 603 whose through directions are aligned in the same direction along the abutting surfaces of the cores 63 c and 64 c are formed in the cores 63 c and 64 c.
  • One and the other of the pair of conductors 61c, 62c are configured such that currents flowing in portions inserted into two adjacent through holes 601 and 602 (or through holes 602 and 603) are in opposite directions. Have been. Accordingly, the magnetic flux does not cancel out in the core between the adjacent through holes 601 and 602 (or the through holes 602 and 603), and the inductance is further increased substantially in proportion to the number of the through holes 601, 602, and 603. be able to.
  • each of the pair of conductors 61c and 62c a portion inserted into two adjacent through holes 601 and 602 (or through holes 602 and 603) and a portion connecting these portions. Are U-shaped. Therefore, each of the pair of conductors 61c and 62c can have a relatively simple shape that is point-symmetric in plan view.
  • the U-shaped portions 61cu and 62cu of the pair of conductors 61c and 62c are configured to be opposite to each other. Therefore, one end and the other end of the pair of conductors 61c, 62c are separated from each other on both sides of the through-holes 601, 602, 603 in the penetrating direction. Can be done.
  • Modification 2 is a form in which the pair of conductors 61b and 62b are formed separately from the peripheral circuit, whereas Modification 2 is a form in which the pair of conductors 61d and 62d are formed integrally with the peripheral circuit. is there.
  • the configuration of the pair of cores 63b and 64b according to the second modification is exactly the same as that of the second embodiment.
  • FIGS. 10A and 10B are plan views schematically showing a pair of conductors 61d and 62d according to the second modification.
  • One end of the conductor 61d is formed integrally with the one-turn secondary winding 12 of the transformer 10, and the other end is formed integrally with the terminal C, as compared with the conductor 61b according to the second embodiment.
  • the conductor 61d may not be integrated with the terminal C.
  • the other conductor 62d has the other end formed integrally with the terminal D as compared with the conductor 62b according to the second embodiment, but does not necessarily have to be so integrated.
  • the conductor 61b of the second embodiment illustrated in FIG. 6 is integrated with the secondary winding 12 and the terminal C, and the conductor 62b is integrated with the terminal D.
  • the conductor 61 shown in FIG. 4 of the first embodiment may be integrated with the secondary winding 12 and the terminal C, and the conductor 62 may be integrated with the terminal D, or the conductor shown in FIG. 9C may be integrated with the secondary winding 12 and the terminal C, and the conductor 62c shown in FIG.
  • the conductor 61d is formed integrally with the secondary winding 12 and the terminal C of the transformer 10, and the conductor 62d is formed integrally with the terminal D.
  • the number of joints between them can be reduced.
  • Modification 3 Embodiment 2 is a mode in which the mounting method of the inductor 6b is not specified, whereas Modification 3 is a mode in which the inductor 6c is mounted on the housing 7.
  • the configuration of the pair of cores 63b and 64b according to the third modification is completely the same as that of the second embodiment.
  • FIG. 11 is a perspective view of the inductor 6c according to the third modification viewed from obliquely above
  • FIG. 12 is a side view schematically showing the inductor 6c attached to the housing 7.
  • the inductor 6c is different from the inductor 6b according to the second embodiment in that the conductor 61b is replaced by a conductor 61e, and the pair of cores 63b and 64b and the conductor 62b are common to those in the second embodiment. is there.
  • the inductor 6b according to the second embodiment is laid flat on a plane, the lower surface of the conductor 61b is higher than the lower surface of the conductor 62b (see FIGS. 6 and 7). Therefore, in the third modification, as shown in FIG. 11, one end and the other end of the conductor 61e bent in opposite directions are bent stepwise in a thickness direction at a position not overlapping with the conductor 62b. It is.
  • the inductor 6c is placed flat on the housing 7 with the core 64b facing down, the lower surface of one end and the other end of the conductor 61e and the lower surface of the one end and the other end of the conductor 62b. , And the height from the housing 7 becomes the same.
  • projecting portions 71 and 72 having the same height are provided on the upper surface of the housing 7.
  • the protrusion 71 is disposed at a position overlapping one end and the other end of the conductor 62b.
  • the protrusion 72 is disposed at a position overlapping one end and the other end of the conductor 61e.
  • An insulating layer 68 is provided between the upper surface of the protrusion 71 and the lower surfaces of the one end and the other end of the conductor 62b.
  • An insulating layer 69 is provided between the upper surface of the protrusion 72 and the lower surfaces of the one end and the other end of the conductor 61e.
  • An insulating layer 65 is provided between portions where the conductor 61e and the conductor 62b overlap.
  • the inductor 6c can be easily attached to the housing 7.
  • Embodiment 3 is a mode in which only a pair of cores 63 and 64 are provided, whereas Embodiment 3 is a mode in which a plurality of pairs of cores 63 and 64 are provided.
  • the third embodiment is a form including a composite inductor including a plurality of inductors 6 in which a pair of conductors 61 and 62 are inserted into a through hole 60 formed by abutting a pair of cores 63 and 64.
  • FIG. 13 is a block diagram illustrating a configuration example of a DC / DC converter 100b according to the third embodiment.
  • the DC / DC converter 100b is connected between the transformer 10 for separating the potentials of the input-side terminals A and B and the potentials of the output-side terminals C and D, a pair of conductors 61 and 62, and between the terminals C and D. And a capacitor 23 connected between the conductors 61 and 62.
  • the secondary winding 12 of the transformer 10 has one end connected to the drain of the FET 51b and the other end connected to the drain of the FET 52b.
  • the drain of the FET 52b is further connected to one end of the capacitor 23 via a conductor 61 included in one inductor (hereinafter, referred to as a first inductor) 6.
  • One end of the capacitor 23 is further connected to one end of the capacitor 21 and a terminal C via a conductor 61 included in the other inductor (hereinafter, referred to as a second inductor) 6.
  • the sources of the FETs 51 b and 52 b are connected to the other end of the capacitor 23 via a conductor 62 included in the first inductor 6.
  • the other end of the capacitor 23 is further connected to the other end of the capacitor 21 and the terminal D via a conductor 62 included in the second inductor 6.
  • the gates of the FETs 51b and 52b are connected to the control unit 4.
  • the same reference numerals are given to portions corresponding to the first embodiment, and description thereof will be omitted.
  • the FETs 51b and 52b may be replaced with the diodes 51 and 52 used in the first embodiment.
  • the number of inductors 6 is not limited to two, and may be three or more.
  • the above-described inductors 6 and 6 correspond to the composite inductor 600.
  • Each inductor 6 is regarded as a two-port pair circuit, and these two-port pair circuits are cascaded. Outflow current flows through the conductor 61 included in the composite inductor 600, and return current flows through the conductor 62.
  • a capacitor is not connected to one terminal pair of the two-terminal pair circuit formed by the first inductor 6, a capacitor may be connected here.
  • the capacitor 23 may be regarded as being connected to the other terminal pair of the two-terminal pair circuit formed by the first inductor 6 or connected to one terminal pair of the two-terminal pair circuit formed by the second inductor 6. May be considered.
  • the capacitor 21 may be deleted and included in an external load. It is not always necessary to connect a capacitor between the conductors 61 and 62 at the connection portion of the two-terminal pair circuit adjacent by the inductors 6, 6,.
  • FIG. 14 is a plan view schematically showing the transformer 10 and the inductors 6 and 6 formed on the printed wiring board 8 of the DC / DC converter 100b according to the third embodiment.
  • the printed wiring board 8 uses a six-layer multi-layer substrate having four inner layers, but the number of inner layers may be three or less or five or more. Although a so-called PQ type core is used for the transformer 10 and a U-shaped core is used for the inductors 6 and 6, the present invention is not limited to this.
  • three legs of a PQ-type core are separately inserted into three openings provided at equal intervals in a direction intersecting the longitudinal direction at one longitudinal end of the printed wiring board 8. .
  • two legs of cores 63 and 64 having a U-shaped cross section are separately provided in two openings provided in the longitudinal direction substantially at the center of the printed wiring board 8 in the longitudinal direction. It has been inserted.
  • two legs of cores 63 and 64 having a U-shaped cross section are separately provided in two openings provided in the longitudinal direction at the other end of the printed wiring board 8 in the longitudinal direction. It has been inserted.
  • a conductor 61 inserted into the through holes 60, 60 of the inductors 6, 6 is formed by a conductor pattern. This conductor pattern is integrated with the one-turn secondary winding 12 of the transformer 10 and the terminal C.
  • a conductor 62 inserted into the through holes 60, 60 of the inductors 6, 6 is formed by a conductor pattern (shown by a broken line). One end, the center, and the other end of the conductor pattern are electrically connected to different conductor patterns formed in one outer layer via via via holes 621, 622, and 623, respectively.
  • the entirety of the conductor pattern formed on the specific inner layer and one outer layer and electrically connected in this way corresponds to the conductor 62.
  • the conductor pattern formed on one outer layer of the conductor 62 at the other end in the longitudinal direction of the printed wiring board 8 is integrated with the terminal D.
  • the primary winding 11 of the transformer 10 is formed in an inner layer of the printed wiring board 8.
  • the number of turns (number of turns) of the primary winding 11 may be two or more, for example, by a spiral conductor pattern formed on an arbitrary inner layer.
  • the windings may be connected in series by via holes connecting the inner layers.
  • the primary winding 11 is shown by a broken line except for an overlapping portion with the conductor 61 and the secondary winding 12.
  • the conductor 62 is indicated by a broken line including a portion where the conductor 62 overlaps the conductor 62.
  • the FET 51b is surface-mounted between the secondary winding 12 and the outer conductor 62 at a location between the transformer 10 and the first inductor 6.
  • An FET 52b is surface-mounted between a conductor 61 and an outer conductor 62 at a portion between the transformer 10 and the first inductor 6.
  • the capacitor 23 is surface-mounted between the conductor 61 and the outer conductor 62 at a portion between the inductors 6 and 6.
  • the capacitor 23 is formed by connecting three capacitors in parallel, but is not limited to this. For example, one capacitor may be used.
  • the capacitor 21 is surface-mounted between the conductor 61 and the conductor 62 in the outer layer at a portion closer to the terminals C and D than the second inductor 6.
  • the capacitor 21 is formed by connecting three capacitors in parallel, but is not limited to this. For example, one capacitor may be used.
  • the capacitors 21 and 23 are multilayer ceramic capacitors, for example, a lead type ceramic capacitor or a film capacitor may be used.
  • the pair of conductors 61 and 62 are formed by the conductor pattern of the printed wiring board 8, an increase in the number of components, an increase in connection points, an increase in processing steps, and the like are suppressed, and noise is reduced. An effect is obtained that a DC / DC converter having a high reduction effect can be easily manufactured.
  • a bus bar can be used for the pair of conductors 61 and 62.
  • soldering or welding is separately performed between the conductors 61 and 62 and the capacitor 23 and between the conductors 61 and 62 and the capacitor 21 without depending on the connection on the printed wiring board 8. Connection and the number of connection points and man-hours increase.
  • the inductance of the composite inductor 600 is distributed to the two inductors 6 and 6 by two pairs of the pair of cores 63 and 64.
  • the volume can be reduced.
  • each inductor 6 formed by inserting a pair of conductors 61 and 62 into a through hole 60 of a pair of cores 63 and 64 is regarded as a two-terminal pair circuit including two inductance elements.
  • the two terminal pair circuits are cascaded. Therefore, the output of the first inductor 6 can be taken over by the input of the second inductor 6.
  • the FET 31 is connected in series to the primary winding 11 of the transformer 10, and the outflow current and return current to the secondary winding 12 of the transformer 10 are controlled by the pair of conductors 61 and 62 of the composite inductor 600. Flows to As a result, when the FET 31 is turned on / off, a current is induced in the secondary winding 12 of the transformer 10, and this current flows through the pair of conductors 61 and 62 in the composite inductor 600, so that the output current is effectively reduced. Can be smoothed.
  • the third embodiment is a form in which the composite inductor 600 includes the inductors 6 and 6 according to the first embodiment
  • the fourth embodiment is a form in which the composite inductor 600b includes the inductors 6b and 6b according to the second embodiment.
  • the block diagram of the DC / DC converter 100b according to the fourth embodiment is the same as that shown in FIG. 13 of the third embodiment, and only the signs of the composite inductor 600 and the inductor 6 are changed.
  • the same reference numerals are given to the portions corresponding to the third embodiment, and the description is omitted.
  • FIG. 15 is a plan view schematically showing the transformer 10 and the inductors 6b, 6b formed on the printed wiring board 8b of the DC / DC converter 100b according to the fourth embodiment.
  • a so-called PQ type core is used for the transformer 10 and an EI type core is used for the inductors 6b and 6b, the present invention is not limited to this.
  • three legs of a PQ-type core are separately inserted into three openings provided at equal intervals in a direction intersecting the longitudinal direction at one longitudinal end of the printed wiring board 8b. .
  • three legs of the EI-type cores 63b and 64b are separately inserted into three openings provided at equal intervals in the longitudinal direction at substantially the center in the longitudinal direction of the printed wiring board 8b. Have been.
  • three legs of the EI type cores 63b and 64b are separately inserted into three openings provided at equal intervals in the longitudinal direction at the other end in the longitudinal direction of the printed wiring board 8b. Have been.
  • a conductor 61 to be inserted into the two through holes 601 and 602 of the inductors 6b and 6b is formed by a conductor pattern.
  • This conductor pattern is integrated with the one-turn secondary winding 12 of the transformer 10 and the terminal C.
  • a conductor 62 inserted into the two through holes 601 and 602 of the inductors 6b and 6b is formed by a conductor pattern (shown by a broken line).
  • One end, the center, and the other end of the conductor pattern are electrically connected to different conductor patterns formed in one outer layer via via via holes 621, 622, and 623, respectively.
  • the via hole portions 621, 622, and 623 are an aggregate of via holes connecting between the specific inner layer and one of the outer layers.
  • the entirety of the conductor pattern formed on the specific inner layer and one outer layer and electrically connected in this way corresponds to the conductor 62.
  • a conductor pattern formed on one outer layer at the other end in the longitudinal direction of the printed wiring board 8b is integrated with the terminal D.
  • the primary winding 11 of the transformer 10 is spirally formed in the inner layer of the printed wiring board 8.
  • the primary winding 11 is shown by a broken line except for an overlapping portion with the conductor 61 and the secondary winding 12.
  • the conductor 62 is indicated by a broken line including a portion where the conductor 62 overlaps the conductor 62.
  • the FET 51b is surface-mounted between the secondary winding 12 and the outer conductor 62 at a location between the transformer 10 and the first inductor 6b.
  • An FET 52b is surface-mounted between a conductor 61 and an outer conductor 62 at a portion between the transformer 10 and the first inductor 6b.
  • the capacitor 23 is surface-mounted between the conductor 61 and the outer conductor 62 in a portion between the inductors 6b, 6b.
  • the capacitor 21 is surface-mounted between the conductor 61 and the outer conductor 62 at a portion closer to the terminals C and D than the second inductor 6b.
  • FIG. 16A is a graph illustrating frequency components of switching noise caused by the DC / DC converter 100 according to the second embodiment.
  • FIG. 16B is a graph illustrating frequency components of switching noise caused by the DC / DC converter 100b according to the fourth embodiment.
  • the vertical axis represents the noise level (dB ⁇ V)
  • the horizontal axis represents the relative frequency to the switching frequency (fundamental wave).
  • a broken line indicated by a dashed line in the drawing is a series of peaks of a fundamental wave and a harmonic wave of noise.
  • the volumes of the cores 63b and 64b, the inductance of the inductor 6b, and the capacitances of the capacitors 21 and 23 used in the simulation are as follows.
  • the cores 63b and 64b according to the second embodiment use the cores 63b and 64b having a volume ratio of about 1/4. Also, the noise level of harmonics can be reduced by 10 dB to 20 dB or more.
  • the inductance of the composite inductor 600b is distributed to the two inductors 6b and 6b by the two pairs of the pair of cores 63b and 64b.
  • the volume can be reduced.
  • each of the inductors 6b formed by inserting the pair of conductors 61 and 62 into the two through holes 601 and 602 of the pair of cores 63b and 64b has two terminals including two inductance elements. It is regarded as a pair circuit, and each two-terminal pair circuit is cascaded. Therefore, the output of the first inductor 6b can be taken over by the input of the second inductor 6b.
  • a two-stage low-pass filter can be formed. it can.
  • the conductor 61 is formed integrally with the secondary winding 12 and the terminal C of the transformer 10 and the conductor 62 is formed integrally with the terminal D, Can be reduced.
  • FIG. 17 is a circuit diagram illustrating a configuration example of the DC / DC converter 100 according to the fifth embodiment.
  • the inductor 6 is provided on the input side (the primary winding 11 side) of the transformer 10.
  • the details of the inductor 6 of the fifth embodiment are the same as those of the inductor 6 described above.
  • the same inductance for example, 1 to 3 ⁇ H as the above-described inductor 6 is required.
  • the DC / DC converter 100 is of a full-bridge type, and four switching elements 35, 36, 37, and 38 forming a full bridge are provided on the input side (primary winding 11 side) of a transformer 10. Have been.
  • the full bridge is configured by connecting switching elements 35 and 36 connected in series and switching elements 37 and 38 connected in series.
  • the inductors 6 according to the first to fourth embodiments are provided on the output side (the secondary winding 12 side) of the transformer 10 included in the DC / DC converter 100.
  • the inductors 6 according to the first to fourth embodiments are used to smooth an AC current and convert it to a DC.
  • the inductor 6 is provided on the input side (the primary winding 11 side) of the transformer 10 included in the DC / DC converter 100.
  • the inductor 6 of the fifth embodiment is used for performing a ZVS (Zero Voltage Switching) operation due to a resonance phenomenon.
  • one end of the first conductor 61 is connected between the switching element 35 and the switching element 36 connected in series.
  • the other end of the first conductor 61 is connected to one end of the primary winding 11 of the transformer 10. Therefore, the switching element 35, the first conductor 61 (the inductor 6), and the primary winding 11 are connected in series.
  • One end of the second conductor is connected between the switching element 35 and the switching element 36 connected in series.
  • the other end of the second conductor 62 is connected to the other end of the primary winding 11 of the transformer 10. Therefore, the switching element 37, the second conductor 62 (the inductor 6), and the primary winding 11 are connected in series.
  • the switching element 35, the first conductor 61, the first winding 11, the second conductor 62, and the switching element 38 are connected in series. Therefore, when the switching element 35 and the switching element 38 are turned on, a current flows from the switching element 35 to the switching element 38 in the order of the first conductor 61, the first winding 11, and the second conductor 62. In this case, the first current flows through the first conductor 61 and goes to the primary winding 11 which is a circuit element outside the inductor 6.
  • the second current is a current that returns to the second conductor 62 via the primary winding 11.
  • the switching element 37, the second conductor 62, the first winding 11, the first conductor 61, and the switching element 36 are connected in series. Therefore, when the switching element 37 and the switching element 36 are turned on, a current flows from the switching element 37 to the switching element 36 in the order of the second conductor 62, the first winding 11, and the first conductor 61. In this case, the second current flows through the second conductor 62 and goes to the primary winding 11 which is a circuit element outside the inductor 6.
  • the first current is a current in which the second current returns to the first conductor 61 via the primary winding 11.
  • the magnitude of the current flowing through the first conductor 61 and the second conductor 62 is assumed to be in the range of 5 to 20 A, and is a relatively small current.

Abstract

L'inducteur objet de l'invention comprend un noyau ayant un premier trou traversant, un premier conducteur électrique qui comprend une partie insérée à travers le premier trou traversant, et à travers lequel un premier courant circule, et un second conducteur électrique qui comprend une partie insérée à travers le premier trou traversant, et à travers lequel un second courant circule, le premier courant et le second courant étant un courant comprenant l'autre courant, retournant à l'inducteur au moyen d'une partie à l'extérieur de l'inducteur ; et les directions du premier courant et du second courant dans le premier trou traversant étant identiques à la direction de pénétration à travers le premier trou traversant.
PCT/JP2019/024706 2018-07-30 2019-06-21 Inducteur, inducteur composite, convertisseur cc/cc, et circuit WO2020026641A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2018142502 2018-07-30
JP2018-142502 2018-07-30
JP2018192845A JP2021180199A (ja) 2018-07-30 2018-10-11 インダクタ、複合インダクタ及びｄｃ／ｄｃコンバータ
JP2018-192845 2018-10-11

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822579A (ja) * 1981-08-04 1983-02-09 Hitachi Metals Ltd スイッチング電源
JPS6481661A (en) * 1987-09-22 1989-03-27 Dx Antenna Constant-voltage power circuit
JP2007097390A (ja) * 2005-08-31 2007-04-12 Tdk Corp スイッチング電源装置
JP2014120559A (ja) * 2012-12-14 2014-06-30 Kitagawa Kogyo Co Ltd 磁性体コア
US20170047155A1 (en) * 2011-11-22 2017-02-16 Volterra Semiconductor LLC Coupled Inductor Arrays And Associated Methods
US20170178795A1 (en) * 2015-12-21 2017-06-22 Infineon Technologies Austria Ag Through-Hole Inductor for Placement Over a Power Stage of a Power Converter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822579A (ja) * 1981-08-04 1983-02-09 Hitachi Metals Ltd スイッチング電源
JPS6481661A (en) * 1987-09-22 1989-03-27 Dx Antenna Constant-voltage power circuit
JP2007097390A (ja) * 2005-08-31 2007-04-12 Tdk Corp スイッチング電源装置
US20170047155A1 (en) * 2011-11-22 2017-02-16 Volterra Semiconductor LLC Coupled Inductor Arrays And Associated Methods
JP2014120559A (ja) * 2012-12-14 2014-06-30 Kitagawa Kogyo Co Ltd 磁性体コア
US20170178795A1 (en) * 2015-12-21 2017-06-22 Infineon Technologies Austria Ag Through-Hole Inductor for Placement Over a Power Stage of a Power Converter

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