WO2023276796A1 - スイッチング電源装置 - Google Patents

スイッチング電源装置 Download PDF

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Publication number
WO2023276796A1
WO2023276796A1 PCT/JP2022/024789 JP2022024789W WO2023276796A1 WO 2023276796 A1 WO2023276796 A1 WO 2023276796A1 JP 2022024789 W JP2022024789 W JP 2022024789W WO 2023276796 A1 WO2023276796 A1 WO 2023276796A1
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WIPO (PCT)
Prior art keywords
common mode
power supply
capacitor
pattern
choke coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/024789
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English (en)
French (fr)
Japanese (ja)
Inventor
祐樹 石倉
達也 細谷
寛之 高辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2023531848A priority Critical patent/JP7563598B2/ja
Publication of WO2023276796A1 publication Critical patent/WO2023276796A1/ja
Priority to US18/399,221 priority patent/US12537444B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M3/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
    • H05K1/0224—Patterned shielding planes, ground planes or power planes
    • H05K1/0225—Single or multiple openings in a shielding, ground or power plane
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
    • 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
    • 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
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components

Definitions

  • the present invention relates to a switching power supply device that includes a circuit board provided with an input power supply input section, a DC-DC converter, a noise reduction circuit, and a ground pattern.
  • Patent Document 1 shows a switching power supply device having a switching circuit, an isolation transformer, a rectifying section, and a filter section.
  • a sharp voltage change occurs when a switching element is turned on or off, and a parasitic voltage is formed between the primary and secondary windings of the isolation transformer.
  • a common-mode noise current flows through the capacitor in the DC voltage output line. When this noise current reaches, for example, a low-voltage battery connected to the output, it can cause electromagnetic interference to other electronic equipment connected to this low-voltage battery.
  • the above noise current flows through the metal housing and frame ground through the negative electrode of the output section.
  • a sharp voltage change occurs when the switching element is turned on or off, and a common mode noise current flows through the metal housing and the frame ground. .
  • these noise currents reach a high-voltage battery connected to the input through stray capacitance formed between the frame ground and wire harness, other electronic currents connected to this high-voltage battery May cause electromagnetic interference to equipment.
  • a common mode choke coil is provided in the DC input line as a countermeasure against electromagnetic interference on the input side, and a choke coil is provided in the DC output line as a countermeasure against electromagnetic interference on the output side. and a filter circuit with a capacitor.
  • an object of the present invention is to suppress common mode noise generated by the switching operation of a switching element in a switching power supply device having a DC-DC converter and a noise reduction circuit, and to provide a common mode choke coil that constitutes the noise reduction circuit. To provide a switching power supply device with improved heat dissipation performance.
  • a switching power supply device as an example of the present disclosure includes: A switching power supply device comprising an input section to which a DC input power supply is connected, a DC-DC converter, a noise reduction circuit, and a circuit board provided with a ground pattern,
  • the DC-DC converter includes an input capacitor, a switching element, an isolation transformer, a rectifying element and an output smoothing capacitor
  • the noise reduction circuit includes a first capacitor connected in parallel to the input section, a surface-mounted common mode choke coil connected between the first capacitor and the input capacitor, and both ends of the input capacitor.
  • the circuit board includes a component mounting surface on which components are mounted, a heat radiation ground surface on which the ground pattern and a plurality of heat radiation conductor patterns are formed, and a through provided between the component mounting surface and the heat radiation ground surface.
  • the circuit board includes a positive circuit pattern and a negative circuit pattern provided on the component mounting surface for passing currents from the input section to the two input terminals of the common mode choke coil, the positive circuit pattern and the negative circuit pattern are positioned close to each other in parallel;
  • the component mounting surface of the circuit board has a component mounting surface side ground pattern arranged below the common mode choke coil, the component mounting surface side ground pattern is electrically and thermally connected to the ground pattern by the through-hole conductor;
  • the ground pattern is electrically insulated from the heat radiation conductor pattern,
  • the two input terminals of the common mode choke coil are electrically connected to the heat radiation conductor pattern by the through-hole conductors, respectively, and the two output terminals of the common mode choke coil are electrically connected to the heat radiation conductor pattern by the through-hole conductors.
  • the noise reduction circuit and the ground pattern constitute a noise balance circuit, and the noise balance circuit suppresses the generation of common mode noise due to the switching operation of the switching element, and reduces the heat generated by the common mode choke coil. Heat is radiated through the through-hole conductor, the ground pattern, and the heat radiating conductor pattern.
  • a switching power supply device that suppresses the generation of common mode noise generated by the switching operation of a switching element and that has improved heat dissipation performance with respect to heat generated in a common mode choke coil that constitutes a noise reduction circuit. be done.
  • FIG. 1 is a circuit diagram of a switching power supply device 101A according to the first embodiment.
  • FIG. 2 is a diagram showing paths of noise currents flowing through the switching power supply device 101A according to the first embodiment.
  • FIG. 3 is a circuit diagram of another switching power supply device 101B according to the first embodiment.
  • FIG. 4 is a plan view of the circuit board 10 including the switching power supply device 101B.
  • FIG. 5 is a circuit diagram of a switching power supply device 102 according to the second embodiment.
  • FIG. 6 is a circuit diagram of a switching power supply device 103 according to the third embodiment and a moving body 303 equipped with this switching power supply device 103.
  • FIG. 7 is a diagram showing paths of noise currents flowing through a switching power supply device as a comparative example.
  • FIG. 1 is a circuit diagram of a switching power supply device 101A according to the first embodiment.
  • the switching power supply device 101A includes a circuit board on which input parts Pin1 and Pin2 of a DC input power supply PS, a DC-DC converter 2, a noise reduction circuit 1 and a ground pattern 4 are provided.
  • the DC-DC converter 2 includes an input capacitor Ci, a switching circuit 3, an output smoothing capacitor Co, and a choke coil CC.
  • the noise reduction circuit 1 includes an X capacitor Cx1 connected in parallel to input sections Pin1 and Pin2, a surface-mounted common mode choke coil CMCC connected between the X capacitor Cx1 and an input capacitor Ci, and an input capacitor Ci and Y capacitors Cy21 and Cy22 electrically connected to both ends of and the ground pattern 4, respectively.
  • the X capacitor Cx1 corresponds to the first capacitor according to the invention
  • the Y capacitors Cy21 and Cy22 correspond to the second capacitors according to the invention.
  • the two input terminals of the common mode choke coil CMCC are electrically connected to the positive and negative terminals of the input parts Pin1 and Pin2, respectively, and the two output terminals of the common mode choke coil CMCC are connected to the positive and negative terminals of the input capacitor Ci. are electrically connected to each other.
  • FIG. 2 is a diagram showing paths of noise currents flowing through the switching power supply device 101A according to the first embodiment.
  • FIG. 7 is a diagram showing paths of noise currents flowing through a switching power supply device as a comparative example.
  • the DC input power supply PS is connected to another electronic device 201 that receives power from this DC input power supply PS.
  • Other electronic devices 201 are, for example, inverters and motors that operate at high voltage.
  • the load Lo is a low-voltage battery, and is connected to another electronic device 202 that receives power from this low-voltage battery or from the switching power supply device 101A.
  • Other electronic equipment 202 is, for example, a car navigation system or a wireless communication device that operates at the low voltage.
  • the switching power supply is provided in a metal housing that is electrically connected to the frame ground FG.
  • the ground pattern 4 of the circuit board that constitutes the switching power supply device 101A is electrically connected to the frame ground FG through the metal housing.
  • a parasitic capacitance Cs1 is formed between the other electronic device 201 and the frame ground FG, a parasitic capacitance Cs2 is formed between the switching elements Q1, Q2 and the metal housing MH, and a primary winding of the isolation transformer TR and a secondary winding are formed.
  • a parasitic capacitance Cs3 is formed between the next winding.
  • the other electronic devices 201 are inverters and motors, which are mounted on the frame ground FG in an electrically insulated state and a thermally conductive state through an insulator sheet.
  • a parasitic capacitance Cs1 is generated in the portion interposing the insulator sheet.
  • the switching circuit 3 shown in FIG. 1 includes switching elements Q1 and Q2, an insulating transformer TR, rectifying elements D1 and D2, capacitors C1 and C2, and a smoothing coil SC in the example shown in FIG.
  • the switching elements Q1 and Q2 are thermally coupled to the metal housing MH through an insulator sheet in order to dissipate the generated heat to the metal housing MH and frame ground FG.
  • the above-mentioned parasitic capacitance Cs2 is generated in the portion where the insulator sheet is interposed.
  • common mode noise currents from the switching elements Q1 and Q2 flow to the other electronic device 201 via the parasitic capacitances Cs3 and Cs1 and the frame ground FG.
  • common mode noise currents from switching elements Q1 and Q2 flow to other electronic device 201 via parasitic capacitances Cs2 and Cs1 and frame ground FG. This causes electromagnetic interference to other electronic devices 201 .
  • a high-frequency magnetic field is generated by a common mode noise current flowing through the frame ground, and electromagnetic noise is radiated from the moving object to the outside. This causes electromagnetic interference to external moving objects and external electronic equipment.
  • a choke coil CC is provided in the current path between the output smoothing capacitor Co and the output section Pout2.
  • the impedance of the current path passing through this choke coil CC is high. Therefore, the common mode noise current is less likely to pass through this current path, and the noise current reaching the positive electrode of the output section Pout is suppressed. This prevents electromagnetic interference with other electronic devices 202 .
  • the self-resonant frequency of the choke coil CC is, for example, 0.53 MHz or more and 108 MHz or less. Therefore, the impedance of the current path in the frequency band of the self-resonant frequency of the common mode noise current is particularly high, effectively suppressing the noise current reaching the positive electrode of the output section Pout.
  • the ground pattern 4 is connected so as to have the same potential as one end of the output smoothing capacitor Co.
  • the current route through it constitutes a noise balancing circuit.
  • the noise balance circuit is a closed circuit against noise currents of noise (common mode noise) generated by the switching operations of the switching elements Q1 and Q2.
  • common-mode noise currents from the switching elements Q1 and Q2, which are noise sources circulate through the parasitic capacitance Cs3 and the metal housing MH and through the Y capacitors Cy21 and Cy22.
  • common mode noise currents from the switching elements Q1 and Q2 flow back through the Y capacitors Cy21 and Cy22 via the parasitic capacitance Cs2 and the metal housing MH.
  • noise currents do not reach the input units Pin1 and Pin2, and electromagnetic interference with other electronic devices 201 is prevented.
  • the choke coil CC is not an element for removing common mode noise, but merely makes it difficult for noise current to flow in the current path between the output smoothing capacitor Co and the output section Pout2. Even if it is low, an effect can be obtained, so that the number of turns of the coil can be reduced (no need to increase it), and the reduction in power loss due to copper loss caused by the winding of the coil can also be suppressed. Therefore, a decrease in power conversion efficiency can be suppressed.
  • the common mode choke coil CMCC Since the common mode choke coil CMCC is provided between the X capacitor Cx1 and the Y capacitors Cy21 and Cy22, the common mode noise current flowing back to the Y capacitors Cy21 and Cy22 is input via the common mode choke coil CMCC. It does not flow to the parts Pin1 and Pin2.
  • the self-resonant frequency of the common mode choke coil CMCC is, for example, 0.53 MHz or more and 108 MHz or less. Therefore, the impedance of the common mode noise current in the self-resonant frequency band is high, and especially the common mode noise current in this frequency band does not return to the input portions Pin1 and Pin2 via the common mode choke coil CMCC.
  • FIG. 3 is a circuit diagram of another switching power supply device 101B according to the first embodiment.
  • the switching power supply device 101B includes a circuit board on which input parts Pin1 and Pin2 of the DC input power supply PS, the DC-DC converter 2, the noise reduction circuit 1 and the ground pattern 4 are provided.
  • the switching power supply device 101B includes Y capacitors Cy31 and Cy32 electrically connected to both ends of the X capacitor Cx1 and the ground pattern 4, respectively. These Y capacitors Cy31 and Cy32 correspond to the third capacitor according to the present invention. It also has an X capacitor Cx2 connected in parallel with the input capacitor Ci. This X capacitor Cx2 corresponds to the fourth capacitor according to the present invention.
  • Other configurations are the same as those of the switching power supply device 101A shown in FIG.
  • the X-capacitor Cx2 after the common-mode choke coil CMCC in this way, it is possible to reduce the normal-mode noise generated in the switching circuit.
  • the Y capacitors Cy31 and Cy32 in front of the common mode choke coil CMCC, the noise attenuation rate of the noise reduction circuit is improved, and the common mode noise generated in the switching circuit is reduced.
  • FIG. 4 is a plan view of the circuit board 10 on which the switching power supply device 101B is configured.
  • the circuit board 10 has a component mounting surface on which components are mounted, and a heat radiation ground surface on which a ground pattern and a heat radiation conductor pattern are formed.
  • the upper part of FIG. 4 is a plan view of the component mounting surface of the switching power supply device 101B, and the lower part is a plan view of the heat dissipation ground surface of the switching power supply device 101B.
  • the noise reduction circuit 1 is provided between the input units Pin1, Pin2 and the input capacitor Ci.
  • the input capacitor Ci is arranged at the end of the DC-DC converter 2 on the side of the input parts Pin1 and Pin2.
  • the input parts Pin1 and Pin2 to the DC-DC converter 2 are linearly arranged on the circuit board.
  • a positive circuit pattern 5AU and a negative circuit pattern 5BU are formed on the component mounting surface of the circuit board 10 to supply current from the input portions Pin1 and Pin2 to the two input terminals of the common mode choke coil CMCC.
  • the positive circuit pattern 5AU and the negative circuit pattern 5BU are positioned close to each other in parallel.
  • the positive electrode circuit pattern 5AU and the negative electrode circuit pattern 5BU are also heat radiation conductor patterns on the component mounting surface, which will be described later.
  • a component mounting surface side ground pattern 4U arranged below the common mode choke coil CMCC is formed on the component mounting surface of the circuit board 10 .
  • a positive circuit pattern 5CU that connects two output terminals of the common mode choke coil CMCC, the Y capacitors Cy21 and CY22, the X capacitor Cx2, and the input capacitor Ci of the DC-DC converter 2 is provided on the component mounting surface of the circuit board 10. and a negative circuit pattern 5DU are formed.
  • the positive circuit pattern 5CU and the negative circuit pattern 5DU are positioned close to each other in parallel.
  • the positive circuit pattern 5CU and the negative circuit pattern 5DU are also heat-dissipating conductor patterns on a component mounting surface, which will be described later.
  • a surface-mounted common mode choke coil CMCC, X capacitors Cx1, Cx2, and Y capacitors Cy21, Cy22, Cy31, Cy32 are mounted on the component mounting surface of the circuit board 10 .
  • the component mounting surface side ground pattern 4U is electrically and thermally connected to the heat radiation ground surface side ground pattern 4B through the through-hole conductor 6G.
  • Heat radiation conductor patterns 5AU, 5BU, 5CU and 5DU are formed on the component mounting surface of the circuit board 10, and heat radiation conductor patterns 5AB, 5BB, 5CB and 5DB are formed on the heat radiation ground surface of the circuit board 10.
  • the heat dissipation conductor patterns 5AU, 5BU, 5CU, 5DU and the heat dissipation conductor patterns 5AB, 5BB, 5CB, 5DB are electrically and thermally connected through through-hole conductors 6A, 6B, 6C, 6D, respectively.
  • the heat dissipation conductor patterns 5AU, 5BU, 5CU, 5DU and the heat dissipation conductor patterns 5AB, 5BB, 5CB, 5DB are more than twice the mounting area of the common mode choke coil CMCC. Therefore, the heat dissipation efficiency of the common mode choke coil CMCC is much higher than that of the common mode choke coil CMCC alone.
  • the heat radiation ground surface side ground pattern 4B is electrically insulated from the heat radiation conductor patterns 5AB, 5BB, 5CB and 5DB.
  • One of the two output terminals of the common mode choke coil CMCC is electrically connected to one terminal of the Y capacitor Cy21 through the heat radiation conductor pattern 5AU. Also, the other output terminal of the common mode choke coil CMCC is electrically connected to one terminal of the Y capacitor Cy22 through the heat radiation conductor pattern 5BU.
  • One of the two input terminals of the common mode choke coil CMCC is electrically connected to one terminal of the Y capacitor Cy31 through the heat radiation conductor pattern 5CU.
  • the other input terminal of the common mode choke coil CMCC is electrically connected to one terminal of the Y capacitor Cy32 through the heat radiation conductor pattern 5DU.
  • the noise reduction circuit 1 and the ground pattern 4 form a noise balance circuit, and this noise balance circuit suppresses common mode noise generated by the switching operation of the switching elements. Also, the heat generated by the common mode choke coil CMCC is effectively dissipated through the component mounting surface side ground pattern 4U, the plurality of through-hole conductors 6G, and the heat dissipation ground surface side ground pattern 4B.
  • the heat generated by the common mode choke coil CMCC includes heat radiation conductor patterns 5AU and 5BU, a plurality of through-hole conductors 6A and 6B, heat radiation conductor patterns 5AB and 5BB, heat radiation conductor patterns 5CU and 5DU, a plurality of through-hole conductors 6C, Heat is more effectively dissipated through 6D and heat dissipating conductor patterns 5CB and 5DB.
  • the second embodiment will exemplify a switching power supply device in which the configuration of the DC-DC converter 2 is different from the example shown in the first embodiment.
  • FIG. 5 is a circuit diagram of the switching power supply device 102 according to the second embodiment.
  • the switching power supply device 102 includes a circuit board on which input portions Pin1 and Pin2 of the DC input power supply PS, the DC-DC converter 2, the noise reduction circuit 1 and the ground pattern 4 are provided.
  • the DC-DC converter 2 includes an input capacitor Ci, a switching circuit 3, an output smoothing capacitor Co, and a choke coil CC.
  • the switching circuit 3 includes switching elements Q1, Q2, an insulating transformer TR, rectifying elements D1, D2, capacitors C2, C3, and a smoothing coil SC.
  • a noise balance circuit is configured by circulating the common mode noise current to the switching circuit through the capacitor Cs3, and the noise balance circuit efficiently suppresses the generation of common mode noise due to the switching operation of the switching element.
  • a single surface-mounted common mode choke coil CMCC is provided between the X capacitor Cx1 and the input capacitor Ci. good too.
  • a common mode choke coil may be further provided between the X capacitor Cx2 and the input capacitor Ci.
  • a common mode choke coil may be provided between the Y capacitors Cy21, Cy22 and the X capacitor Cx2.
  • FIG. 6 is a circuit diagram of a switching power supply device 103 according to the third embodiment and a moving body 303 equipped with this switching power supply device 103. As shown in FIG.
  • the switching power supply device 103 is a power supply device mounted on a moving body 303 having a frame ground FG electrically insulated from the ground (earth) G.
  • the configuration of this switching power supply device 103 is similar to that of the switching power supply device shown in the first or second embodiment.
  • the moving body 303 is, for example, an electric vehicle such as a HV (hybrid vehicle), an EV (electric vehicle), a PHV (plug-in hybrid vehicle), or an FCV (fuel cell vehicle).
  • a frame ground FG is the chassis of the electric vehicle.
  • the frame ground FG of the moving body 303 is electrically insulated from the ground (earth) G by rubber tires.
  • the switching power supply device 103 converts power input to the input units Pin1 and Pin2 into power output to the output unit Pout.
  • the switching power supply device 103 is constructed in a metal housing MH, and the metal housing MH is electrically connected to the frame ground FG.
  • the input parts Pin1 and Pin2 of the input power supply PS are insulated from the metal housing MH, and the negative electrode of the output part is electrically connected to the metal housing MH and the frame ground FG.
  • the DC input power supply PS is connected to other electronic devices that receive power from the DC input power supply PS and operate at a high voltage.
  • Other electronic devices are, for example, inverters and motors.
  • the load Lo is a low-voltage battery and receives power from this low-voltage battery or from the switching power supply device 103 .
  • Other Electronic Devices Such as car navigation systems and wireless communication devices that operate at the above-mentioned low voltage.
  • the switching power supply device of the present invention can be applied to a moving body mounted on a moving body having a frame ground electrically insulated from the ground.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Dc-Dc Converters (AREA)
PCT/JP2022/024789 2021-06-30 2022-06-22 スイッチング電源装置 Ceased WO2023276796A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023531848A JP7563598B2 (ja) 2021-06-30 2022-06-22 スイッチング電源装置
US18/399,221 US12537444B2 (en) 2021-06-30 2023-12-28 Switching power supply device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-108318 2021-06-29
JP2021108318 2021-06-30

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