WO2022138216A1 - 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
WO2022138216A1
WO2022138216A1 PCT/JP2021/045425 JP2021045425W WO2022138216A1 WO 2022138216 A1 WO2022138216 A1 WO 2022138216A1 JP 2021045425 W JP2021045425 W JP 2021045425W WO 2022138216 A1 WO2022138216 A1 WO 2022138216A1
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WO
WIPO (PCT)
Prior art keywords
circuit
power supply
switching
output
bridge capacitor
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/JP2021/045425
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English (en)
French (fr)
Japanese (ja)
Inventor
達也 細谷
寛之 高辻
祐樹 石倉
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
Original Assignee
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
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Priority to JP2022572129A priority Critical patent/JP7563487B2/ja
Publication of WO2022138216A1 publication Critical patent/WO2022138216A1/ja
Priority to US18/335,058 priority patent/US12549094B2/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
    • H02M3/02—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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H02M1/143—Arrangements for reducing ripples from DC input or output using compensating arrangements
    • 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
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer

Definitions

  • the present invention relates to a switching power supply device including a DC-DC converter circuit and a noise reduction circuit.
  • the DC-DC converter circuit is a circuit that converts DC input power using a switching circuit, and is equipped with a feedback control circuit to output a predetermined DC voltage in response to fluctuations in input voltage and load.
  • CMCC common mode choke coils
  • Patent Document 1 is shown as a DC-DC converter circuit provided with an EMI countermeasure circuit.
  • a first series circuit in which two capacitors are connected in series is provided on the input side of this DC-DC converter circuit, and a second series circuit in which two capacitors are connected in series on the output side of the DC-DC converter circuit. Is provided, and the connection point between the capacitors of the first series circuit and the connection point between the capacitors of the second series circuit are connected by a metal plate.
  • the potential of the DC output line can be relatively stabilized, and the occurrence of electromagnetic interference can be reduced.
  • noise countermeasures for switching power supplies are implemented after the circuit design of the DC-DC converter is completed.
  • the EMI noise suppression circuit is adjusted for noise suppression, the adjustment affects the operation of the feedback control circuit of the DC-DC converter, causing the DC-DC converter to malfunction or DC-DC to suppress the malfunction. It may be necessary to redesign the circuit of the converter. Therefore, new problems such as extension of the design period will occur.
  • it is necessary to take measures such as adding a large-sized EMI noise circuit, which causes a problem such as an increase in the size of the switching power supply device.
  • an object of the present invention is to suppress the influence of common mode noise on feedback control in a switching power supply device including a DC-DC converter circuit and a feedback control circuit.
  • the switching power supply device as an example of the present disclosure is Equipped with DC input line, DC output line, DC-DC converter circuit and noise reduction circuit
  • the DC-DC converter circuit is With an inductor A switching circuit that allows a switching current to flow through the inductor,
  • the first input capacitor which is the input power supply connected in parallel to the DC input line,
  • the first output capacitor connected in parallel to the DC output line and
  • An output voltage detection circuit connected in parallel to the DC output line
  • a feedback control circuit that controls the switching circuit so that the output voltage of the DC output line becomes a predetermined voltage
  • the noise reduction circuit is The first half-bridge capacitor circuit connected between the DC input lines and The second half-bridge capacitor circuit connected between the DC output lines and A first common mode choke coil connected between the second half-bridge capacitor circuit and the switching circuit, Electricity that electrically connects the midpoint of the first half-bridge capacitor circuit and the midpoint of the second half-bridge capacitor circuit to form a noise balancing circuit that balances common-mode noise with a potential different from that of ground.
  • the noise balance circuit is characterized in that the influence of common mode noise on the feedback control circuit is suppressed.
  • the switching power supply device as an example of the present disclosure is Equipped with DC input line, DC output line, DC-DC converter circuit and noise reduction circuit
  • the DC-DC converter circuit is With an inductor A switching circuit that allows a switching current to flow through the inductor, The first output capacitor connected in parallel to the DC output line and An output voltage detection circuit connected in parallel to the DC output line, A feedback control circuit that controls the switching circuit so that the output voltage of the DC output line becomes a predetermined voltage, and Equipped with The noise reduction circuit is The first half-bridge capacitor circuit connected between the DC input lines and The second half-bridge capacitor circuit connected between the DC output lines and A second common mode choke coil connected between the switching circuit and the first half-bridge capacitor circuit, Electricity that electrically connects the midpoint of the first half-bridge capacitor circuit and the midpoint of the second half-bridge capacitor circuit to form a noise balancing circuit that balances common-mode noise with a potential different from that of ground. With a route.
  • the noise balance circuit is characterized in that the influence of common mode noise on the feedback control circuit is suppressed.
  • the influence of common mode noise on feedback control can be suppressed.
  • FIG. 1 is a circuit diagram of a switching power supply device 101A according to the first embodiment.
  • FIG. 2 is a circuit diagram of the switching power supply device 101B according to the first embodiment.
  • FIG. 3 is a circuit diagram of the switching power supply device 102 according to the second embodiment.
  • FIG. 4 is a circuit diagram of the switching power supply device 103A according to the third embodiment.
  • FIG. 5 is a circuit diagram of the switching power supply device 103B according to the third embodiment.
  • FIG. 6 is a circuit diagram of the switching power supply devices 104A and 104B according to the fourth embodiment.
  • FIG. 7 is a circuit diagram of still another switching power supply device 104C, 104D, 104E according to the fourth embodiment.
  • FIG. 8A is a circuit diagram of the step-down DC-DC converter circuit 10 included in the switching power supply device according to the fourth embodiment
  • FIG. 8B is a circuit diagram of the buck-boost DC-DC converter circuit 10. Is.
  • FIG. 9 is a circuit diagram of the DC-DC converter circuit 10 included in the switching power supply device according to the fifth embodiment.
  • FIG. 1 is a circuit diagram of a switching power supply device 101A according to the first embodiment.
  • the switching power supply device 101A is connected between the DC power supply Vin and the load circuit RL. Further, the switching power supply device 101A includes a DC-DC converter circuit 10 and a noise reduction circuit.
  • the DC-DC converter circuit 10 is a power input line DCin, a DC output line DCout, an inductor L1, a switching circuit 12 for passing a switching current through the inductor L1, and an input power supply connected in parallel to the power input line DCin.
  • the output voltage of the 1-input capacitor Ci1, the first output capacitor Co1 connected in parallel to the DC output line DCout, the output voltage detection circuit 13 connected in parallel to the DC output line DCout, and the DC output line DCout becomes a predetermined voltage.
  • a feedback control circuit 14 for controlling the switching circuit 12 is provided.
  • the switching circuit 12 is composed of a switch element Q1 and a diode D1.
  • the noise reduction circuit includes a circuit 21 (hereinafter referred to as “first half-bridge capacitor circuit”) which is connected between power input lines DCin and is composed of capacitors C11 and C12 connected in series to each other, and a DC output line DCout.
  • a circuit 22 composed of capacitors C21 and C22 connected in series between them (hereinafter referred to as “second half-bridge capacitor circuit”), and a switching circuit 12 and a second half-bridge capacitor circuit 22. It includes a first common mode choke coil 31 connected between them, and an electric path 1 that electrically connects the midpoint of the first half-bridge capacitor circuit 21 and the midpoint of the second half-bridge capacitor circuit 22.
  • the first common mode choke coil 31 is composed of coils L11 and L12 that are magnetically coupled to each other.
  • the first half-bridge capacitor circuit 21, the second half-bridge capacitor circuit 22, and the electric path 1 form a noise balancing circuit that balances common mode noise having a potential different from that of ground.
  • the noise reduction circuit includes a noise balance circuit and a first common mode choke coil 31.
  • the noise balance circuit suppresses the influence of common mode noise on the feedback control circuit 14. Since the midpoint of the first half-bridge capacitor circuit 21 is the intermediate potential of the power input line DCin and the midpoint of the second half-bridge capacitor circuit 22 is the intermediate potential of the DC output line DCout, both intermediate potential portions are electrically pathed. By making a common connection through 1, the difference between the input side common mode noise component of the DC-DC converter circuit 10 and the output side common mode noise component of the DC-DC converter circuit 10 is canceled out. More specifically, common mode noise has a relatively high frequency and is out of phase. Therefore, these common mode noises cancel each other out by flowing in the electric path 1. This balances the common mode noise with a potential different from that of ground.
  • the electric path 1 is composed of a metal plate. As a result, the voltage drop due to the electric path 1 becomes small, and the potential difference between the midpoint of the first half-bridge capacitor circuit 21 and the midpoint of the second half-bridge capacitor circuit 22 becomes small. Therefore, the equilibration of the common mode noise works more effectively.
  • the first common mode choke coil 31 is connected between the switching circuit 12 and the second half bridge capacitor circuit 22, the first common mode choke coil 31 is the DC output line of the DC-DC converter circuit 10. Suppresses common mode noise superimposed on DCout. Since the first common mode choke coil 31 is connected between the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22, the output voltage detection circuit 13, the first half-bridge capacitor circuit 21, and the second half-bridge capacitor circuit 21 are connected. The common mode current flowing through the half-bridge capacitor circuit 22 can be reduced, and the influence on the feedback control circuit 14 can be suppressed.
  • the feedback control circuit 14 is conventionally affected, and the feedback control circuit 14
  • the common mode current flowing through the output voltage detection circuit 13, the first half-bridge capacitor circuit 21, and the second half-bridge capacitor circuit 22 can be reduced, and the feedback control circuit 14 can be redesigned. It is not necessary to redesign the feedback control circuit 14 because the influence on the capacitor is suppressed.
  • the capacitances of the capacitors C11, C12, C21, and C22 constituting the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22 can be reduced, so that the leakage current can be reduced. Does not increase.
  • the negative electrode of the DC output line DCout has the same potential as the frame ground of the housing to which the DC output line is incorporated. This has the effect and advantage that the common mode current flowing from the DC output line DCout to the frame ground of the housing to be incorporated is suppressed, and the common mode noise is greatly reduced. Further, there is an effect and an advantage that the feedback control circuit 14 does not need to be redesigned due to the action that the common mode current flowing through the output voltage detection circuit 13 is reduced and the influence on the feedback control circuit 14 is suppressed.
  • the switching power supply device 101A can exert the following effects while suppressing the influence of the common mode noise on the feedback control circuit.
  • the switching power supply circuit 10A can significantly shorten the design period even when adjusting the capacity of the filter capacitor constituting the EMI countermeasure circuit, and realizes the power conversion operation without increasing the leakage current to ensure safety. can. Further, in the switching power supply device 101A, even if the capacity of the filter capacitor is adjusted, there is almost no change in the feedback control circuit or an increase in leakage current, safety can be ensured, and the size and price can be reduced.
  • FIG. 2 is a circuit diagram of another switching power supply device 101B according to the first embodiment. It differs from the switching power supply device 101A shown in FIG. 1 in that it includes a second output capacitor Co2.
  • the switching power supply device 101B includes a second output capacitor Co2 connected between the DC output lines DCout on the load side of the first common mode choke coil 31.
  • Other configurations are the same as those of the switching power supply device 101A shown in FIG.
  • Second Embodiment a switching power supply device in which the connection position of the output voltage detection circuit 13 is different from the examples shown so far will be illustrated.
  • FIG. 3 is a circuit diagram of the switching power supply device 102 according to the second embodiment.
  • the switching power supply 102 is connected between the DC power supply Vin and the load circuit RL. Further, the switching power supply device 102 includes a DC-DC converter circuit 10 and a noise reduction circuit. In FIG. 3, circuits other than the DC-DC converter circuit 10 constitute a noise reduction circuit.
  • the DC-DC converter circuit 10 is a power input line DCin, a DC output line DCout, an inductor L1, a switching circuit 12 for passing a switching current through the inductor L1, and an input power supply connected in parallel to the power input line DCin.
  • a feedback control circuit 14 that controls the switching circuit 12 so that the voltage becomes a predetermined voltage is provided.
  • the noise reduction circuit includes a first half-bridge capacitor circuit 21 connected between power input lines DCin, a second half-bridge capacitor circuit 22 connected between DC output lines DCout, a switching circuit 12, and a second half-bridge capacitor.
  • a first common mode choke coil 31 connected between the circuit 22 and an electric path 1 that electrically connects the middle point of the first half-bridge capacitor circuit 21 and the middle point of the second half-bridge capacitor circuit 22. , Equipped with.
  • the first half-bridge capacitor circuit 21, the second half-bridge capacitor circuit 22, and the electric path 1 form a noise balancing circuit that balances common mode noise having a potential different from that of ground.
  • the output voltage detection circuit 13 is connected in parallel to both ends of the second half-bridge capacitor circuit 22.
  • the voltage of the DC output line DCout supplied to the load circuit RL is detected, so that the detection accuracy of the output voltage is improved.
  • Other effects are the same as those shown in the first embodiment.
  • the third embodiment shows an example in which the connection position of the common mode choke coil is different from the examples shown in the first and second embodiments.
  • FIG. 4 is a circuit diagram of the switching power supply device 103A according to the third embodiment.
  • the switching power supply 103A is connected between the DC power supply Vin and the load circuit RL. Further, the switching power supply device 103A includes a DC-DC converter circuit 10 and a noise reduction circuit. In FIG. 4, circuits other than the DC-DC converter circuit 10 constitute a noise reduction circuit.
  • the DC-DC converter circuit 10 is a power input line DCin, a DC output line DCout, an inductor L1, a switching circuit 12 for passing a switching current through the inductor L1, and an input power supply connected in parallel to the power input line DCin.
  • the output voltage of the 1-input capacitor Ci1, the first output capacitor Co1 connected in parallel to the DC output line DCout, the output voltage detection circuit 13 connected in parallel to the DC output line DCout, and the DC output line DCout becomes a predetermined voltage.
  • a feedback control circuit 14 for controlling the switching circuit 12 is provided.
  • the noise reduction circuit is a series connection between the first half-bridge capacitor circuit 21 which is connected between the power input line DCin and is composed of capacitors C11 and C12 which are connected in series with each other and the DC output line DCout.
  • the second half-bridge capacitor circuit 22 composed of the capacitors C21 and C22, the second common mode choke coil 32 connected between the first half-bridge capacitor circuit 21 and the switching circuit 12, and the first half bridge. It includes an electrical path 1 that electrically connects the midpoint of the capacitor circuit 21 and the midpoint of the second half-bridge capacitor circuit 22.
  • the first half-bridge capacitor circuit 21, the second half-bridge capacitor circuit 22, and the electric path 1 form a noise balancing circuit that balances common mode noise having a potential different from that of ground.
  • the second common mode choke coil 32 suppresses common mode noise superimposed on the power input line DCin of the DC-DC converter circuit 10. Since the second common mode choke coil 32 is connected between the first half bridge capacitor circuit 21 and the switching circuit 12, the common mode noise generated by the switching circuit 12 is the same as that of the first half bridge capacitor circuit 21. It is balanced with the second half-bridge capacitor circuit 22, the flow of the common mode current to the output voltage detection circuit 13 is reduced, and the influence on the feedback control circuit 14 is suppressed.
  • the capacities of the capacitors C11, C12, C21, and C22 constituting the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22 can be reduced, so that the leakage current can be reduced. Does not increase.
  • FIG. 5 is a circuit diagram of the switching power supply device 103B according to the third embodiment. It differs from the switching power supply device 103A shown in FIG. 4 in that it includes a second input capacitor Ci2.
  • the second input capacitor Ci2 is connected between the power supply input lines DCin on the DC-DC converter circuit 10 side from the second common mode choke coil 32.
  • Other configurations are the same as those of the switching power supply device 103A shown in FIG.
  • FIG. 6 is a circuit diagram of the switching power supply devices 104A and 104B according to the fourth embodiment.
  • These switching power supply devices 104A and 104B include a DC-DC converter circuit 10, a first half-bridge capacitor circuit 21, a second half-bridge capacitor circuit 22, and a first common mode choke coil 31. Further, an electric path 1 for electrically connecting the midpoint of the first half-bridge capacitor circuit 21 and the midpoint of the second half-bridge capacitor circuit 22 is provided.
  • the impedance element Z1 is connected in series to the electric path 1 of the switching power supply device 104A.
  • This impedance element Z1 has at least an inductance component or a resistance component.
  • An impedance element Z2 is connected between the electric path 1 of the switching power supply device 104B and the ground.
  • the impedance element Z2 has at least a capacitance component, an inductance component, or a resistance component.
  • This "ground” is a ground or a frame ground.
  • the impedance element Z1 By connecting the impedance element Z1 in series to the electric path 1 as in the switching power supply device 104A, even if the effect of suppressing the common mode noise by the first common mode choke coil 31 is insufficient, the impedance element Z1 makes it common. The suppression of mode noise is supplemented. That is, the impedance element Z1 consumes the energy that the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22 move to balance through the electric path 1 as heat, so that the common mode noise is suppressed accordingly. ..
  • the impedance element Z2 is connected between the electric path 1 and the ground.
  • the impedance element Z2 has at least a capacitance component, an inductance component, or a resistance component.
  • the impedance element Z2 By connecting the impedance element Z2 between the electric path 1 and the ground in this way, even if the effect of suppressing the common mode noise by the first common mode choke coil 31 is insufficient, the impedance element Z2 makes it common.
  • the suppression of mode noise is supplemented. That is, the current that flows for the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22 to balance through the electric path 1 flows to the ground through the impedance element Z2.
  • This current (leakage current) is smaller than the current leaking from the line bypass capacitor circuit to the ground when the line bypass capacitor circuit is provided. Therefore, even if the capacities of the first half-bridge capacitor circuit 21 and the second half-bridge capacitor circuit 22 are increased, the leakage current hardly increases.
  • FIG. 7 is a circuit diagram of still another switching power supply device 104C, 104D, 104E according to the fourth embodiment.
  • the impedance element Z2 is connected between the electric path 1 and the ground.
  • the impedance element Z1 is connected in series between the connection point of the impedance element Z2 with respect to the electric path 1 and the middle point of the second half bridge capacitor circuit 22. Further, in the switching power supply device 104D, the impedance element Z3 is connected in series between the connection point of the impedance element Z2 with respect to the electric path 1 and the middle point of the first half-bridge capacitor circuit 21. In the switching power supply device 104E, the impedance element Z1 is connected in series between the connection point of the impedance element Z2 with respect to the electric path 1 and the midpoint of the second half bridge capacitor circuit 22, and the impedance element Z2 with respect to the electric path 1 is connected. An impedance element Z3 is connected in series between the connection point and the midpoint of the first half-bridge capacitor circuit 21.
  • the impedance elements Z1 and Z3 are resistors or inductors and the impedance element Z2 is a capacitor, the low-pass filter is configured by these impedance elements. If the impedance elements Z1 and Z3 are capacitors and the impedance elements Z2 are resistors or inductors, these impedance elements constitute a high-pass filter.
  • FIG. 8A is a circuit diagram of the step-down DC-DC converter circuit 10 included in the switching power supply device according to the fifth embodiment
  • FIG. 8B is a circuit diagram of the buck-boost DC-DC converter circuit 10. Is.
  • the configuration of the switching power supply device other than these DC-DC converter circuits 10 is the same as that of the embodiments shown so far.
  • the DC-DC converter circuit 10 shown in FIG. 8A is composed of a switch element Q1, a diode D1, an inductor L1 and a first output capacitor Co1. A switching current flows through the inductor L1 and a regenerative current flows through the diode D1 due to the switching of the switch element Q1.
  • the DC-DC converter circuit 10 shown in FIG. 8B is composed of a switch element Q1, a diode D1, an inductor L1 and a first output capacitor Co1. A switching current flows through the inductor L1 and a regenerative current flows through the diode D1 due to the switching of the switch element Q1.
  • the DC-DC converter included in the switching power supply device is not limited to the boost converter, but can be similarly applied to a step-down converter or a buck-boost converter.
  • a switching power supply device including a DC-DC converter having a configuration different from that of the DC-DC converters shown so far will be illustrated.
  • FIG. 9 is a circuit diagram of the DC-DC converter circuit 10 included in the switching power supply device according to the sixth embodiment.
  • the configuration of the switching power supply device other than the DC-DC converter circuit 10 is the same as that of the embodiments shown so far.
  • the DC-DC converter circuit 10 shown in FIG. 9 is a current resonance type half-bridge DC-DC converter, and is an LC resonance circuit composed of an inductor Lr and a capacitor Cr on a primary winding Lp of a transformer T and two switches. Elements Q1 and Q2 are connected.
  • a rectifying smoothing circuit including diodes D1 and D2 and a first output capacitor Co1 is configured in the secondary windings Ls1 and Ls2 of the transformer T.
  • the switch elements Q1 and Q2 are complementarily turned on and off with a dead time in between, and the current waveform flowing through the transformer T becomes a sinusoidal resonance waveform. Further, power is transmitted from the primary side to the secondary side in both the on period / off period of the two switch elements Q1 and Q2.
  • the DC-DC converter included in the switching power supply device can be similarly applied even if it is an isolated converter.
  • First half-bridge capacitor circuit 22 Second half-bridge capacitor circuit 31 ... First common mode choke coil 32 . Second common mode choke coil 101A, 101B, 102, 103A, 103B, 104A, 104B, 104C, 104D, 104E ... Switching power supply device

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  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dc-Dc Converters (AREA)
PCT/JP2021/045425 2020-12-21 2021-12-10 スイッチング電源装置 Ceased WO2022138216A1 (ja)

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JP2022572129A JP7563487B2 (ja) 2020-12-21 2021-12-10 スイッチング電源装置
US18/335,058 US12549094B2 (en) 2020-12-21 2023-06-14 Switching power supply device with noise reduction filter

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JP2020-210980 2020-12-21

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JP2015104268A (ja) * 2013-11-27 2015-06-04 日本リライアンス株式会社 二次電池の充放電制御装置
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