WO2022190856A1 - Switching power supply device, switch control device, in-vehicle device, and vehicle - Google Patents

Switching power supply device, switch control device, in-vehicle device, and vehicle Download PDF

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Publication number
WO2022190856A1
WO2022190856A1 PCT/JP2022/007207 JP2022007207W WO2022190856A1 WO 2022190856 A1 WO2022190856 A1 WO 2022190856A1 JP 2022007207 W JP2022007207 W JP 2022007207W WO 2022190856 A1 WO2022190856 A1 WO 2022190856A1
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Prior art keywords
switch
period
turned
power supply
switching power
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PCT/JP2022/007207
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French (fr)
Japanese (ja)
Inventor
慎吾 橋口
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ローム株式会社
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Priority to JP2023505270A priority Critical patent/JPWO2022190856A1/ja
Publication of WO2022190856A1 publication Critical patent/WO2022190856A1/en

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    • 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

Definitions

  • the invention disclosed in this specification relates to a switching power supply device that steps down an input voltage to an output voltage, a switch control device, an in-vehicle device, and a vehicle.
  • the DC-DC converter proposed in Patent Document 1 has a switched capacitor circuit, and improves efficiency by turning on a high-side switch included in the switched capacitor circuit with zero-volt switching.
  • the output voltage is 1/4 of the input voltage, and if the input voltage fluctuates, the output voltage also fluctuates and the output voltage cannot be stabilized.
  • a switching power supply device disclosed in this specification includes first to fourth switches, a capacitor, and a controller configured to control on/off of each of the first to fourth switches.
  • the first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to be connectable to
  • the second switch is configured such that the second end of the second switch is connectable to the first end of the third switch and the first end of the first inductor.
  • the third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage.
  • the fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. Configured to be connectable to the ends.
  • the control unit turns on the first switch, turns off the second switch, and turns off the fourth switch for a first period, turns on the second switch, and turns off the first switch, and a second period during which the third switch is turned off and the fourth switch is turned on.
  • the switch control device disclosed in this specification is part of a switching power supply device that includes first to fourth switches and a capacitor.
  • the first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to be connectable to
  • the second switch is configured such that the second end of the second switch is connectable to the first end of the third switch and the first end of the first inductor.
  • the third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage.
  • the fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. Configured to be connectable to the ends.
  • the switch control device is configured to control on/off of each of the first to fourth switches, turning on the first switch, turning off the second switch, and turning off the fourth switch. It is configured to provide a first period and a second period during which the second switch is turned on, the first switch is turned off, the third switch is turned off, and the fourth switch is turned on.
  • the in-vehicle equipment disclosed in this specification includes the switching power supply device configured as described above or the switch control device configured as described above.
  • the vehicle disclosed in this specification includes the vehicle-mounted device configured as described above and a battery that supplies power to the vehicle-mounted device.
  • FIG. 1 is a diagram showing the configuration of a switching power supply device according to one embodiment.
  • FIG. 2 is a time chart showing the operation of the switching power supply device according to one embodiment.
  • FIG. 3 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 4 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 5 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 6 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 7 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 8 is a diagram showing the current flowing through the switching power supply device according to one embodiment.
  • FIG. 9 is an external view showing one configuration example of the vehicle.
  • a MOS transistor is defined as a gate structure that includes a layer made of a conductor or a semiconductor such as polysilicon with a low resistance value, an insulating layer, and a P-type, N-type, or intrinsic semiconductor.
  • layer refers to a transistor consisting of at least three layers. In other words, the structure of the gate of a MOS transistor is not limited to a three-layer structure of metal, oxide, and semiconductor.
  • FIG. 1 is a diagram showing the configuration of a switching power supply device according to one embodiment.
  • a switching power supply device 1 (hereinafter referred to as “switching power supply device 1") according to one embodiment is a switching power supply device that steps down an input voltage VIN to an output voltage VOUT.
  • the switching power supply device 1 includes a control unit CNT1, first to fourth switches SW1 to SW4, a capacitor C1, a first inductor L1, a second inductor L2, an output capacitor COUT, and an output feedback unit FB1.
  • a control unit CNT1 first to fourth switches SW1 to SW4
  • capacitor C1 a capacitor C1
  • first inductor L1 a first inductor L1
  • second inductor L2 an output capacitor COUT
  • an output feedback unit FB1 an output feedback unit
  • the control unit CNT1 controls ON/OFF of the first to fourth switches SW1 to SW4 based on the output of the output feedback unit FB1.
  • the control unit CNT1 is a switch control device that controls ON/OFF of the first to fourth switches SW1 to SW4.
  • the first switch SW1 is configured such that a first end can be connected to the application end of the input voltage VIN, and a second end is configured to be connectable to the first end of the capacitor C1 and the first end of the second switch SW2.
  • the first switch SW1 conducts/disconnects a current path between the application terminal of the input voltage VIN and the first connection node N1.
  • the first connection node N1 is a node to which the second end of the first switch SW1, the first end of the second switch SW2, and the first end of the capacitor C1 are connected.
  • a P-channel MOS transistor, an N-channel MOS transistor, or the like can be used as the first switch SW1.
  • the switching power supply device 1 may be provided with a bootstrap circuit or the like to generate a voltage higher than the input voltage VIN.
  • the second switch SW2 is configured such that the second end can be connected to the first end of the third switch SW3 and the first end of the first inductor L1.
  • the second switch SW2 conducts/disconnects the current path between the first connection node N1 and the third connection node N3.
  • the third connection node N3 is a node to which the second end of the second switch SW2, the first end of the third switch SW3, and the first end of the first inductor L1 are connected.
  • a P-channel MOS transistor, an N-channel MOS transistor, or the like can be used as the second switch SW2.
  • the switching power supply 1 may be provided with a bootstrap circuit or the like to generate a voltage higher than the input voltage VIN.
  • the third switch SW3 is configured so that the second end can be connected to the ground potential application end.
  • the third switch SW3 conducts/disconnects the current path between the third connection node N3 and the ground potential.
  • an N-channel MOS transistor or the like can be used as the third switch SW3.
  • the fourth switch SW4 has a first end connectable to the second end of the capacitor C1 and the first end of the second inductor L2, and a second end connectable to the ground potential application end.
  • the fourth switch SW4 conducts/disconnects the current path between the second connection node N2 and the ground potential.
  • the second connection node N2 is a node to which the second end of the capacitor C1, the first end of the fourth switch SW4, and the first end of the second inductor L2 are connected.
  • an N-channel MOS transistor or the like can be used as the fourth switch SW4.
  • the output capacitor COUT has a first end connectable to the second end of the first inductor L1, the second end of the second inductor L2, and the output terminal OUT, and the second end connectable to the ground potential application end. configured to An output voltage VOUT applied to the output terminal OUT is supplied to a load LD1 connected to the output terminal OUT.
  • the output feedback unit FB1 generates and outputs a feedback signal according to the output voltage VOUT.
  • the output feedback unit FB1 for example, a resistance voltage dividing circuit or the like that divides the output voltage VOUT by resistance to generate a feedback signal can be used. Further, for example, the output feedback unit FB1 may be configured to acquire the output voltage VOUT and output the output voltage VOUT itself as a feedback signal. In addition to the feedback signal corresponding to the output voltage VOUT, the output feedback unit FB1 also generates and outputs a feedback signal corresponding to the current flowing through the first inductor L1 and the current flowing through the second inductor L2. good too. Current mode control is enabled by the output feedback unit FB1 also generating a feedback signal according to the current flowing through the first inductor L1 and the current flowing through the second inductor L2.
  • the control unit CNT1 controls ON/OFF of the first to fourth switches SW1 to SW4. More specifically, the control unit CNT1 controls on/off of the first to fourth switches SW1 to SW4 based on the feedback signal output from the output feedback unit FB1.
  • FIG. 2 is a time chart showing the operation of the switching power supply 1.
  • FIG. 1 the direction from one end (third connection node N3 side) of the first inductor L1 to the other end (output terminal OUT side) is defined as the positive direction of the current IL1 flowing through the first inductor L1.
  • the direction from one end (the second node N2 side) of the two-inductor L2 to the other end (the output terminal OUT side) is the positive direction of the current IL2 flowing through the second inductor L2.
  • the control unit CNT1 determines the length of the first period P1 (period from timing t1 to timing t3) and the length of the second period P2 (period from timing t3 to timing t4) according to the feedback signal output from the output feedback unit FB1. set the length of Thereby, the relationship between the input voltage VIN and the output voltage VOUT in the switching power supply device 1 can be changed.
  • the control unit CNT1 turns on the first switch SW1, turns off the second switch SW2, and turns off the fourth switch SW4.
  • a current flows from the input terminal to the output capacitor COUT and the output terminal OUT via the first switch SW1, the capacitor C1, and the second inductor L2 (see FIG. 3).
  • the capacitor C1 is electrically connected to the input terminal and not electrically connected to the ground potential, so the voltage V1 at the first connection node N1 rises to 48 V, The voltage V2 of N2 rises to 24V.
  • the control unit CNT1 turns on the third switch SW3.
  • the control unit CNT1 turns off the third switch SW3.
  • the current IL1 flowing through the first inductor L1 is zero.
  • the third switch SW3 is turned on, so the current IL1 flowing through the first inductor L1 becomes a negative current (see FIG. 4).
  • the voltage V3 at the third connection node N3 rises because the third switch SW3 is turned off.
  • the potential difference between both ends of the second switch SW2 when the second switch SW2 is turned ON is reduced (ideally can be set to zero, the efficiency of the switching power supply device 1 can be improved.
  • the control unit CNT1 turns on the second switch SW2, turns off the first switch SW1, turns off the third switch SW3, and turns on the fourth switch SW4.
  • a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the fourth switch SW4, the capacitor C1, the second switch SW2, and the first inductor L1 (see FIG. 5).
  • the capacitor C1 is electrically connected to the ground potential and the capacitor C1 is not electrically connected to the input terminal.
  • the voltage V2 of N2 drops to 0V.
  • the control unit CNT1 continues to turn on the third switch SW3 until the current IL1 flowing through the first inductor L1 decreases to zero, that is, until timing t6 is reached.
  • a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the third switch SW3 and the first inductor L1 (see FIG. 6). Therefore, the switching power supply device 1 includes a first current detection section (not shown) that detects the current IL1 flowing through the first inductor L1.
  • the first current detection unit for example, a current detection unit that indirectly detects the current IL1 flowing through the first inductor L1 by detecting the current flowing through the third switch SW3 based on the potential difference across the third switch SW3 can be used. . This is because when the second switch SW2 is off and the third switch SW3 is on, the current flowing through the third switch SW3 can be regarded as the current IL1 flowing through the first inductor L1.
  • the control unit CNT1 keeps turning on the fourth switch SW4 until the current IL2 flowing through the second inductor L2 decreases to zero, that is, until timing t5 is reached.
  • a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the fourth switch SW4 and the second inductor L2 (see FIG. 7). Therefore, the switching power supply device 1 includes a second current detector (not shown) that detects the current IL2 flowing through the second inductor L2.
  • the second current detection unit for example, a current detection unit that detects the current IL2 flowing through the second inductor L2 by detecting the current flowing through the fourth switch SW4 based on the potential difference between both ends of the fourth switch SW4 can be used. . This is because when the first switch SW1 is off and the fourth switch SW4 is on, the current flowing through the fourth switch SW4 can be regarded as the current IL2 flowing through the second inductor L2.
  • the control unit CNT1 turns on the fourth switch SW4 from the end of the second period P2 until the start of the first period P1 in the next cycle, that is, before the first switch SW1 is turned on.
  • a second ON period O2 (period from timing t6 to timing t7) is provided. At the start of the second ON period O2 (timing t6), the current IL2 flowing through the second inductor L2 is zero. In the second ON period O2, the fourth switch SW4 is turned on, so the current IL2 flowing through the second inductor L2 becomes a negative current (see FIG. 8).
  • the fourth switch SW4 is turned off, so that the voltage V2 of the second connection node N2 rises.
  • the potential difference across the first switch SW1 when the first switch SW1 is turned on can be reduced (ideally to zero), so that the efficiency of the switching power supply 1 can be improved.
  • the controller CNT1 always turns on the fourth switch SW4 when turning on the second switch SW2 so that both ends of the capacitor Cr are in a low impedance state when turning on the second switch SW2.
  • control unit CNT1 makes the length of the first period P1 and the length of the second period P2 equal in each cycle PD in order to keep the potential difference across the capacitor Cr substantially constant.
  • FIG. 9 is an external view showing a configuration example of a vehicle in which the in-vehicle device is mounted.
  • the vehicle X of this configuration example is equipped with onboard devices X11 to X17 and a battery (not shown) that supplies power to these onboard devices X11 to X17.
  • the control unit CNT1 When the switching power supply device 1 described above is installed in the vehicle X, it is required to suppress radiation noise in the AM band so as not to adversely affect the reception of AM radio broadcasts. Therefore, it is desirable that the control unit CNT1 generates a voltage of 1.8 MHz or more and 2.1 MHz or less at the first connection node N1. That is, it is desirable to set the reciprocal (switching frequency) of the fixed value of each cycle to 1.8 MHz or more and 2.1 MHz or less. This is because if the switching frequency is less than 1.8 MHz, radiation noise in the AM band increases, and if the switching frequency is greater than 2.1 MHz, the switching loss exceeds the allowable range.
  • the in-vehicle device X11 is an engine control unit that performs engine-related controls (injection control, electronic throttle control, idling control, oxygen sensor heater control, auto-cruise control, etc.).
  • the in-vehicle device X12 is a lamp control unit that controls lighting and extinguishing of HID [high intensity discharged lamp] and DRL [daytime running lamp].
  • the in-vehicle device X13 is a transmission control unit that performs controls related to the transmission.
  • the in-vehicle device X14 is a body control unit that performs controls related to the movement of the vehicle X (ABS [anti-lock brake system] control, EPS [electric power steering] control, electronic suspension control, etc.).
  • ABS anti-lock brake system
  • EPS electric power steering
  • electronic suspension control etc.
  • the in-vehicle device X15 is a security control unit that controls driving such as door locks and security alarms.
  • In-vehicle equipment X16 is electronic equipment that is built into vehicle X at the factory shipment stage as standard equipment or manufacturer options, such as wipers, electric door mirrors, power windows, electric sunroofs, electric seats, and air conditioners.
  • the in-vehicle device X17 is an electronic device that the user arbitrarily attaches to the vehicle X, such as an in-vehicle A/V [audio/visual] device, a car navigation system, and an ETC [Electronic Toll Collection System].
  • switching power supply device 1 can be incorporated in any of the in-vehicle devices X11 to X17.
  • the potential difference across the capacitor C1 is kept constant by aligning the length of the first period P1 and the length of the second period P2 in each cycle.
  • the length of the first period P1 and the length of the second period P2 are not made the same.
  • the configuration may be such that the ratio with the length of the two periods P2 is adjusted.
  • the timing when the second switch SW2 is turned on and the timing when the current IL1 flowing through the first inductor L1 becomes zero are the same timing (timing t3), but the second switch SW2 is turned on.
  • the timing may be before the timing at which the current IL1 flowing through the first inductor L1 becomes zero, or after the timing at which the current IL1 flowing through the first inductor L1 becomes zero.
  • the second switch SW2 turns on before the current IL1 flowing through the first inductor L1 becomes zero, the second switch SW2 will not be zero volt switching. Therefore, it is desirable to turn on the second switch SW2 at the same time as the current IL1 flowing through the first inductor L1 becomes zero or after the current IL1 flowing through the first inductor L1 becomes zero.
  • the switching power supply device (1) described above is configured to control ON/OFF of each of the first to fourth switches (SW1 to SW4), the capacitor (C1), and the first to fourth switches.
  • a control unit (CNT1) wherein the first switch is configured such that a first end of the first switch can be connected to an input voltage application end, and a second end of the first switch is connected to a second switch;
  • the second switch is configured to be connectable to a first end and a first end of the capacitor, wherein the second switch connects a second end of the second switch to a first end of the third switch and a first end of the first inductor.
  • the third switch is configured such that a second end of the third switch can be connected to a low voltage application end lower than the input voltage; one end of the switch is configured to be connectable to the second end of the capacitor and the first end of the second inductor, the second end of the fourth switch is configured to be connectable to the low voltage application end, and the control unit comprises , a first period of turning on the first switch, turning off the second switch, and turning off the fourth switch; turning on the second switch, turning off the first switch, and turning off the third switch; is turned off, and a second period during which the fourth switch is turned on (first configuration).
  • the switching power supply device having the first configuration can change the relationship between the input voltage and the output voltage.
  • control unit is configured to provide a first ON period for turning on the third switch before turning on the second switch (second configuration ).
  • the potential difference between both ends of the second switch can be reduced (ideally zero) when the second switch is turned on, so efficiency can be improved.
  • control section is configured to provide a second ON period for turning on the fourth switch before turning on the first switch (the 3).
  • the potential difference between both ends of the first switch can be reduced (ideally zero) when the first switch is turned on, so efficiency can be improved.
  • control section is configured to provide both the first ON period and the second ON period, and the current flowing through the first inductor at the start of the first ON period.
  • a configuration (fourth configuration) in which the current is zero and the current flowing through the second inductor at the start of the second ON period is also possible.
  • the switching power supply device having the fourth configuration can achieve even higher efficiency.
  • control unit is configured to always turn on the fourth switch when turning on the second switch (fifth configuration).
  • the switching power supply device having the fifth configuration can bring both ends of the capacitor into a low impedance state when turning on the second switch.
  • control unit is configured to match the length of the first period and the length of the second period in each period (sixth configuration).
  • the switching power supply device having the sixth configuration can keep the potential difference across the capacitor constant.
  • control section may be configured to include the first ON period within the first period (seventh configuration).
  • the first half of the first period is set as the first ON period, and the second half of the first period is set as the non-first ON period.
  • the voltage of the connection node with the third switch can be increased.
  • the switch control device (CNT1) described above includes first to fourth switches (SW1 to SW4) and a capacitor (C1).
  • the second end of the first switch is connectable to the first end of the second switch and the first end of the capacitor, and the second switch is configured to be connectable to the application end of the second switch is connectable to the first end of the third switch and the first end of the first inductor, the third switch being configured such that the second end of the third switch is lower than the input voltage;
  • a first end of the fourth switch is connectable to a second end of the capacitor and a first end of the second inductor;
  • a part of a switching power supply device wherein a second end of a switch is configured to be connectable to the low voltage application end, and is configured to control on/off of each of the first to fourth switches, a first period in which the first switch is turned on, the second switch is turned off, and the fourth switch is turned off; and the second switch is turned on, the first switch is turned off, and the third switch is turned off. and
  • the switch control device having the eighth configuration can change the relationship between the input voltage and the output voltage in the switching power supply device.
  • the vehicle-mounted device described above has a configuration (ninth configuration) including the switching power supply device having any one of the first to seventh configurations or the switch control device having the eighth configuration.
  • the vehicle-mounted devices (X11 to X17) having the ninth configuration can change the relationship between the input voltage and the output voltage in the switching power supply.
  • the vehicle (X) described above has a configuration (tenth configuration) including the vehicle-mounted device of the ninth configuration and a battery that supplies power to the vehicle-mounted device.
  • the vehicle having the tenth configuration can change the relationship between the input voltage and the output voltage in the switching power supply.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

This switching power supply device comprises first to fourth switches, a capacitor, and a control unit configured so as to control the on/off of each of the first to fourth switches. The control unit is configured so as to provide a first period in which the first switch is turned on, the second switch is turned off, and the fourth switch is turned off and a second period in which the second switch is turned on, the first switch is turned off, the third switch is turned off, and the fourth switch is turned on.

Description

スイッチング電源装置、スイッチ制御装置、車載機器、及び車両Switching power supply device, switch control device, in-vehicle equipment, and vehicle
　本明細書中に開示されている発明は、入力電圧を出力電圧に降圧するスイッチング電源装置、スイッチ制御装置、車載機器、及び車両に関する。 The invention disclosed in this specification relates to a switching power supply device that steps down an input voltage to an output voltage, a switch control device, an in-vehicle device, and a vehicle.
　特許文献１で提案されているＤＣ－ＤＣコンバータは、スイッチドキャパシタ回路を有し、スイッチドキャパシタ回路に含まれるハイサイドスイッチをゼロボルトスイッチングでターンオンすることで効率を向上させている。 The DC-DC converter proposed in Patent Document 1 has a switched capacitor circuit, and improves efficiency by turning on a high-side switch included in the switched capacitor circuit with zero-volt switching.
特開２０１０－１４８２８８号公報JP 2010-148288 A
　しかしながら、特許文献１で提案されているＤＣ－ＤＣコンバータでは、出力電圧が入力電圧の１／４であり、入力電圧が変動した場合に出力電圧も変動してしまい出力電圧を安定化できない。 However, in the DC-DC converter proposed in Patent Document 1, the output voltage is 1/4 of the input voltage, and if the input voltage fluctuates, the output voltage also fluctuates and the output voltage cannot be stabilized.
　本明細書中に開示されているスイッチング電源装置は、第１～第４スイッチと、コンデンサと、前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成される制御部と、を備える。前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成される。前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成される。前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成される。前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成される。前記制御部は、前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、を設けるように構成される。 A switching power supply device disclosed in this specification includes first to fourth switches, a capacitor, and a controller configured to control on/off of each of the first to fourth switches. Prepare. The first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to be connectable to The second switch is configured such that the second end of the second switch is connectable to the first end of the third switch and the first end of the first inductor. The third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage. The fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. Configured to be connectable to the ends. The control unit turns on the first switch, turns off the second switch, and turns off the fourth switch for a first period, turns on the second switch, and turns off the first switch, and a second period during which the third switch is turned off and the fourth switch is turned on.
　本明細書中に開示されているスイッチ制御装置は、第１～第４スイッチと、コンデンサと、を備えるスイッチング電源装置の一部である。前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成される。前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成される。前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成される。前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成される。前記スイッチ制御装置は、前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成され、前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、を設けるように構成される。 The switch control device disclosed in this specification is part of a switching power supply device that includes first to fourth switches and a capacitor. The first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to be connectable to The second switch is configured such that the second end of the second switch is connectable to the first end of the third switch and the first end of the first inductor. The third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage. The fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. Configured to be connectable to the ends. The switch control device is configured to control on/off of each of the first to fourth switches, turning on the first switch, turning off the second switch, and turning off the fourth switch. It is configured to provide a first period and a second period during which the second switch is turned on, the first switch is turned off, the third switch is turned off, and the fourth switch is turned on.
　本明細書中に開示されている車載機器は、上記構成のスイッチング電源装置又は上記構成のスイッチ制御装置を備える。 The in-vehicle equipment disclosed in this specification includes the switching power supply device configured as described above or the switch control device configured as described above.
　本明細書中に開示されている車両は、上記構成の車載機器と、前記車載機器に電力を供給するバッテリと、を備える。 The vehicle disclosed in this specification includes the vehicle-mounted device configured as described above and a battery that supplies power to the vehicle-mounted device.
　本明細書中に開示されている発明によれば、スイッチング電源装置における入力電圧と出力電圧との関係を変更することができる。 According to the invention disclosed in this specification, it is possible to change the relationship between the input voltage and the output voltage in the switching power supply.
図１は、一実施形態に係るスイッチング電源装置の構成を示す図である。FIG. 1 is a diagram showing the configuration of a switching power supply device according to one embodiment. 図２は、一実施形態に係るスイッチング電源装置の動作を示すタイムチャートである。FIG. 2 is a time chart showing the operation of the switching power supply device according to one embodiment. 図３は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 3 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図４は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 4 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図５は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 5 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図６は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 6 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図７は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 7 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図８は、一実施形態に係るスイッチング電源装置を流れる電流を示す図である。FIG. 8 is a diagram showing the current flowing through the switching power supply device according to one embodiment. 図９は、車両の一構成例を示す外観図である。FIG. 9 is an external view showing one configuration example of the vehicle.
　本明細書において、ＭＯＳトランジスタとは、ゲートの構造が、「導電体または抵抗値が小さいポリシリコン等の半導体からなる層」、「絶縁層」、及び「Ｐ型、Ｎ型、又は真性の半導体層」の少なくとも３層からなるトランジスタをいう。つまり、ＭＯＳトランジスタのゲートの構造は、金属、酸化物、及び半導体の３層構造に限定されない。 In this specification, a MOS transistor is defined as a gate structure that includes a layer made of a conductor or a semiconductor such as polysilicon with a low resistance value, an insulating layer, and a P-type, N-type, or intrinsic semiconductor. layer” refers to a transistor consisting of at least three layers. In other words, the structure of the gate of a MOS transistor is not limited to a three-layer structure of metal, oxide, and semiconductor.
　図１は、一実施形態に係るスイッチング電源装置の構成を示す図である。一実施形態に係るスイッチング電源装置１（以下、「スイッチング電源装置１」という）は、入力電圧ＶＩＮを出力電圧ＶＯＵＴに降圧するスイッチング電源装置である。スイッチング電源装置１は、制御部ＣＮＴ１と、第１～第４スイッチＳＷ１～ＳＷ４と、コンデンサＣ１と、第１インダクタＬ１と、第２インダクタＬ２と、出力コンデンサＣＯＵＴと、出力帰還部ＦＢ１と、を備える。 FIG. 1 is a diagram showing the configuration of a switching power supply device according to one embodiment. A switching power supply device 1 (hereinafter referred to as "switching power supply device 1") according to one embodiment is a switching power supply device that steps down an input voltage VIN to an output voltage VOUT. The switching power supply device 1 includes a control unit CNT1, first to fourth switches SW1 to SW4, a capacitor C1, a first inductor L1, a second inductor L2, an output capacitor COUT, and an output feedback unit FB1. Prepare.
　制御部ＣＮＴ１は、出力帰還部ＦＢ１の出力に基づき、第１～第４スイッチＳＷ１～ＳＷ４のオン／オフを制御する。言い換えると、制御部ＣＮＴ１は、第１～第４スイッチＳＷ１～ＳＷ４のオン／オフを制御するスイッチ制御装置である。 The control unit CNT1 controls ON/OFF of the first to fourth switches SW1 to SW4 based on the output of the output feedback unit FB1. In other words, the control unit CNT1 is a switch control device that controls ON/OFF of the first to fourth switches SW1 to SW4.
　第１スイッチＳＷ１は、第１端が入力電圧ＶＩＮの印加端に接続可能に構成され、第２端がコンデンサＣ１の第１端及び第２スイッチＳＷ２の第１端に接続可能に構成される。第１スイッチＳＷ１は、入力電圧ＶＩＮの印加端と第１接続ノードＮ１との間の電流経路を導通／遮断する。第１接続ノードＮ１は、第１スイッチＳＷ１の第２端と第２スイッチＳＷ２の第１端とコンデンサＣ１の第１端とが接続されるノードである。第１スイッチＳＷ１としては、例えばＰチャネル型ＭＯＳトランジスタ、Ｎチャネル型ＭＯＳトランジスタ等を用いることができる。例えば第１スイッチＳＷ１にＮチャネル型ＭＯＳトランジスタを用いる場合、入力電圧ＶＩＮより大きい電圧を生成するためにブートストラップ回路等をスイッチング電源装置１に設けるようにすればよい。 The first switch SW1 is configured such that a first end can be connected to the application end of the input voltage VIN, and a second end is configured to be connectable to the first end of the capacitor C1 and the first end of the second switch SW2. The first switch SW1 conducts/disconnects a current path between the application terminal of the input voltage VIN and the first connection node N1. The first connection node N1 is a node to which the second end of the first switch SW1, the first end of the second switch SW2, and the first end of the capacitor C1 are connected. For example, a P-channel MOS transistor, an N-channel MOS transistor, or the like can be used as the first switch SW1. For example, when an N-channel MOS transistor is used for the first switch SW1, the switching power supply device 1 may be provided with a bootstrap circuit or the like to generate a voltage higher than the input voltage VIN.
　第２スイッチＳＷ２は、第２端が第３スイッチＳＷ３の第１端及び第１インダクタＬ１の第１端に接続可能に構成される。第２スイッチＳＷ２は、第１接続ノードＮ１と第３接続ノードＮ３との間の電流経路を導通／遮断する。第３接続ノードＮ３は、第２スイッチＳＷ２の第２端と第３スイッチＳＷ３の第１端と第１インダクタＬ１の第１端とが接続されるノードである。第２スイッチＳＷ２としては、例えばＰチャネル型ＭＯＳトランジスタ、Ｎチャネル型ＭＯＳトランジスタ等を用いることができる。例えば第２スイッチＳＷ２にＮチャネル型ＭＯＳトランジスタを用いる場合、入力電圧ＶＩＮより大きい電圧を生成するためにブートストラップ回路等をスイッチング電源装置１に設けるようにすればよい。 The second switch SW2 is configured such that the second end can be connected to the first end of the third switch SW3 and the first end of the first inductor L1. The second switch SW2 conducts/disconnects the current path between the first connection node N1 and the third connection node N3. The third connection node N3 is a node to which the second end of the second switch SW2, the first end of the third switch SW3, and the first end of the first inductor L1 are connected. For example, a P-channel MOS transistor, an N-channel MOS transistor, or the like can be used as the second switch SW2. For example, if an N-channel MOS transistor is used for the second switch SW2, the switching power supply 1 may be provided with a bootstrap circuit or the like to generate a voltage higher than the input voltage VIN.
　第３スイッチＳＷ３は、第２端がグランド電位の印加端に接続可能に構成される。第３スイッチＳＷ３は、第３接続ノードＮ３とグランド電位との間の電流経路を導通／遮断する。第３スイッチＳＷ３としては、例えばＮチャネル型ＭＯＳトランジスタ等を用いることができる。 The third switch SW3 is configured so that the second end can be connected to the ground potential application end. The third switch SW3 conducts/disconnects the current path between the third connection node N3 and the ground potential. For example, an N-channel MOS transistor or the like can be used as the third switch SW3.
　第４スイッチＳＷ４は、第１端がコンデンサＣ１の第２端及び第２インダクタＬ２の第１端に接続可能に構成され、第２端がグランド電位の印加端に接続可能に構成される。第４スイッチＳＷ４は、第２接続ノードＮ２とグランド電位との間の電流経路を導通／遮断する。第２接続ノードＮ２は、コンデンサＣ１の第２端と第４スイッチＳＷ４の第１端と第２インダクタＬ２の第１端とが接続されるノードである。第４スイッチＳＷ４としては、例えばＮチャネル型ＭＯＳトランジスタ等を用いることができる。 The fourth switch SW4 has a first end connectable to the second end of the capacitor C1 and the first end of the second inductor L2, and a second end connectable to the ground potential application end. The fourth switch SW4 conducts/disconnects the current path between the second connection node N2 and the ground potential. The second connection node N2 is a node to which the second end of the capacitor C1, the first end of the fourth switch SW4, and the first end of the second inductor L2 are connected. For example, an N-channel MOS transistor or the like can be used as the fourth switch SW4.
　出力コンデンサＣＯＵＴは、第１端が第１インダクタＬ１の第２端と第２インダクタＬ２の第２端と出力端子ＯＵＴとに接続可能に構成され、第２端がグランド電位の印加端に接続可能に構成される。出力端子ＯＵＴに印加される出力電圧ＶＯＵＴは、出力端子ＯＵＴに接続される負荷ＬＤ１に供給される。 The output capacitor COUT has a first end connectable to the second end of the first inductor L1, the second end of the second inductor L2, and the output terminal OUT, and the second end connectable to the ground potential application end. configured to An output voltage VOUT applied to the output terminal OUT is supplied to a load LD1 connected to the output terminal OUT.
　出力帰還部ＦＢ１は、出力電圧ＶＯＵＴに応じた帰還信号を生成して出力する。出力帰還部ＦＢ１としては、例えば出力電圧ＶＯＵＴを抵抗分圧して帰還信号を生成する抵抗分圧回路等を用いることができる。また例えば、出力帰還部ＦＢ１は、出力電圧ＶＯＵＴを取得し、出力電圧ＶＯＵＴそのものを帰還信号として出力する構成であってもよい。なお、出力帰還部ＦＢ１は、出力電圧ＶＯＵＴに応じた帰還信号に加えて、第１インダクタＬ１を流れる電流及び第２インダクタＬ２を流れる電流に応じた帰還信号も生成して出力する構成であってもよい。出力帰還部ＦＢ１が第１インダクタＬ１を流れる電流及び第２インダクタＬ２を流れる電流に応じた帰還信号も生成することで、電流モード制御が可能になる。 The output feedback unit FB1 generates and outputs a feedback signal according to the output voltage VOUT. As the output feedback unit FB1, for example, a resistance voltage dividing circuit or the like that divides the output voltage VOUT by resistance to generate a feedback signal can be used. Further, for example, the output feedback unit FB1 may be configured to acquire the output voltage VOUT and output the output voltage VOUT itself as a feedback signal. In addition to the feedback signal corresponding to the output voltage VOUT, the output feedback unit FB1 also generates and outputs a feedback signal corresponding to the current flowing through the first inductor L1 and the current flowing through the second inductor L2. good too. Current mode control is enabled by the output feedback unit FB1 also generating a feedback signal according to the current flowing through the first inductor L1 and the current flowing through the second inductor L2.
　制御部ＣＮＴ１は、第１～第４スイッチＳＷ１～ＳＷ４それぞれのオン／オフを制御する。より詳細には、制御部ＣＮＴ１は、出力帰還部ＦＢ１から出力される帰還信号に基づき、第１～第４スイッチＳＷ１～ＳＷ４それぞれのオン／オフを制御する。 The control unit CNT1 controls ON/OFF of the first to fourth switches SW1 to SW4. More specifically, the control unit CNT1 controls on/off of the first to fourth switches SW1 to SW4 based on the feedback signal output from the output feedback unit FB1.
　以下、入力電圧ＶＩＮを４８Ｖにし、グランド電位を０Ｖにした場合を例に挙げて説明を行う。 A case where the input voltage VIN is set to 48V and the ground potential is set to 0V will be described below as an example.
　図２は、スイッチング電源装置１の動作を示すタイムチャートである。なお、本明細書では、第１インダクタＬ１の一端（第３接続ノードＮ３側）から他端（出力端子ＯＵＴ側）に向かう方向を、第１インダクタＬ１を流れる電流ＩＬ１の正の向きとし、第２インダクタＬ２の一端（第２ノードＮ２側）から他端（出力端子ＯＵＴ側）に向かう方向を、第２インダクタＬ２を流れる電流ＩＬ２の正の向きとする。制御部ＣＮＴ１は、出力帰還部ＦＢ１から出力される帰還信号に応じて第１期間Ｐ１（タイミングｔ１からタイミングｔ３までの期間）の長さ及び第２期間Ｐ２（タイミングｔ３からタイミングｔ４までの期間）の長さを設定する。これにより、スイッチング電源装置１における入力電圧ＶＩＮと出力電圧ＶＯＵＴとの関係を変更することができる。負荷ＬＤ１が軽負荷であるほど第１期間Ｐ１の長さ及び第２期間Ｐ２の長さはそれぞれ短くなる。 FIG. 2 is a time chart showing the operation of the switching power supply 1. FIG. In this specification, the direction from one end (third connection node N3 side) of the first inductor L1 to the other end (output terminal OUT side) is defined as the positive direction of the current IL1 flowing through the first inductor L1. The direction from one end (the second node N2 side) of the two-inductor L2 to the other end (the output terminal OUT side) is the positive direction of the current IL2 flowing through the second inductor L2. The control unit CNT1 determines the length of the first period P1 (period from timing t1 to timing t3) and the length of the second period P2 (period from timing t3 to timing t4) according to the feedback signal output from the output feedback unit FB1. set the length of Thereby, the relationship between the input voltage VIN and the output voltage VOUT in the switching power supply device 1 can be changed. The lighter the load LD1, the shorter the length of the first period P1 and the length of the second period P2.
　第１期間Ｐ１において、制御部ＣＮＴ１は、第１スイッチＳＷ１をオンにし、第２スイッチＳＷ２をオフにし、第４スイッチＳＷ４をオフにする。これにより、入力端子から第１スイッチＳＷ１、コンデンサＣ１、及び第２インダクタＬ２を経由して出力コンデンサＣＯＵＴ及び出力端子ＯＵＴに電流が流れる（図３参照）。 In the first period P1, the control unit CNT1 turns on the first switch SW1, turns off the second switch SW2, and turns off the fourth switch SW4. As a result, a current flows from the input terminal to the output capacitor COUT and the output terminal OUT via the first switch SW1, the capacitor C1, and the second inductor L2 (see FIG. 3).
　第１期間Ｐ１では、コンデンサＣ１と入力端子とが電気的に接続されコンデンサＣ１とグランド電位とが電気的に接続されないので、第１接続ノードＮ１の電圧Ｖ１は４８Ｖまで上昇し、第２接続ノードＮ２の電圧Ｖ２は２４Ｖまで上昇する。 In the first period P1, the capacitor C1 is electrically connected to the input terminal and not electrically connected to the ground potential, so the voltage V1 at the first connection node N1 rises to 48 V, The voltage V2 of N2 rises to 24V.
　第１期間Ｐ１の前半（第１オン期間Ｏ１、タイミングｔ１からタイミングｔ２までの期間）において、制御部ＣＮＴ１は、第３スイッチＳＷ３をオンにする。一方、第１期間Ｐ１の後半（タイミングｔ２からタイミングｔ３までの期間）において、制御部ＣＮＴ１は、第３スイッチＳＷ３をオフにする。第１期間Ｐ１の前半（第１オン期間Ｏ１）の開始時点では、第１インダクタＬ１を流れる電流ＩＬ１は零である。第１期間Ｐ１の前半（第１オン期間Ｏ１）では、第３スイッチＳＷ３がオンになるため、第１インダクタＬ１を流れる電流ＩＬ１が負電流になる（図４参照）。そして、第１期間Ｐ１の後半では、第３スイッチＳＷ３がオフになるため、第３接続ノードＮ３の電圧Ｖ３が上昇する。 In the first half of the first period P1 (the first ON period O1, the period from timing t1 to timing t2), the control unit CNT1 turns on the third switch SW3. On the other hand, in the latter half of the first period P1 (period from timing t2 to timing t3), the control unit CNT1 turns off the third switch SW3. At the start of the first half of the first period P1 (first ON period O1), the current IL1 flowing through the first inductor L1 is zero. In the first half of the first period P1 (first ON period O1), the third switch SW3 is turned on, so the current IL1 flowing through the first inductor L1 becomes a negative current (see FIG. 4). Then, in the latter half of the first period P1, the voltage V3 at the third connection node N3 rises because the third switch SW3 is turned off.
　第２スイッチＳＷ２のターンオンの前に、第３スイッチＳＷ３をオンにする第１オン期間Ｏ１を設けることにより、第２スイッチＳＷ２がターンオンするときの第２スイッチＳＷ２の両端電位差を小さく（理想的には零に）できるので、スイッチング電源装置１の高効率化を図ることができる。 By providing the first ON period O1 during which the third switch SW3 is turned ON before the second switch SW2 is turned ON, the potential difference between both ends of the second switch SW2 when the second switch SW2 is turned ON is reduced (ideally can be set to zero, the efficiency of the switching power supply device 1 can be improved.
　第１期間Ｐ１が終了すると、第２期間Ｐ２が開始する。 When the first period P1 ends, the second period P2 starts.
　第２期間Ｐ２において、制御部ＣＮＴ１は、第２スイッチＳＷ２をオンにし、第１スイッチＳＷ１をオフにし、第３スイッチＳＷ３をオフにし、第４スイッチＳＷ４をオンにする。これにより、グランド電位から第４スイッチＳＷ４、コンデンサＣ１、第２スイッチＳＷ２、及び第１インダクタＬ１経由して出力コンデンサＣＯＵＴ及び出力端子ＯＵＴに電流が流れる（図５参照）。 In the second period P2, the control unit CNT1 turns on the second switch SW2, turns off the first switch SW1, turns off the third switch SW3, and turns on the fourth switch SW4. As a result, a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the fourth switch SW4, the capacitor C1, the second switch SW2, and the first inductor L1 (see FIG. 5).
　第２期間Ｐ２では、コンデンサＣ１とグランド電位とが電気的に接続されコンデンサＣ１と入力端子とが電気的に接続されないので、第１接続ノードＮ１の電圧Ｖ１は２４Ｖまで下降し、第２接続ノードＮ２の電圧Ｖ２は０Ｖまで下降する。 In the second period P2, the capacitor C1 is electrically connected to the ground potential and the capacitor C1 is not electrically connected to the input terminal. The voltage V2 of N2 drops to 0V.
　第２期間Ｐ２が終了すると、制御部ＣＮＴ１は、第２スイッチＳＷ２をターンオフする。 When the second period P2 ends, the control unit CNT1 turns off the second switch SW2.
　第２期間Ｐ２が終了した後も、制御部ＣＮＴ１は、第１インダクタＬ１を流れる電流ＩＬ１が減少して零になるまで、すなわちタイミングｔ６に到達するまで、第３スイッチＳＷ３をオンにし続ける。これにより、グランド電位から第３スイッチＳＷ３及び第１インダクタＬ１を経由して出力コンデンサＣＯＵＴ及び出力端子ＯＵＴに電流が流れる（図６参照）。したがって、スイッチング電源装置１は、第１インダクタＬ１を流れる電流ＩＬ１を検出する第１電流検出部（不図示）を備える。第１電流検出部としては、例えば第３スイッチＳＷ３の両端電位差により第３スイッチＳＷ３を流れる電流を検出して間接的に第１インダクタＬ１を流れる電流ＩＬ１を検出する電流検出部を挙げることができる。第２スイッチＳＷ２がオフであり、第３スイッチＳＷ３がオンであるとき、第３スイッチＳＷ３を流れる電流は第１インダクタＬ１を流れる電流ＩＬ１とみなすことができるからである。 Even after the second period P2 ends, the control unit CNT1 continues to turn on the third switch SW3 until the current IL1 flowing through the first inductor L1 decreases to zero, that is, until timing t6 is reached. As a result, a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the third switch SW3 and the first inductor L1 (see FIG. 6). Therefore, the switching power supply device 1 includes a first current detection section (not shown) that detects the current IL1 flowing through the first inductor L1. As the first current detection unit, for example, a current detection unit that indirectly detects the current IL1 flowing through the first inductor L1 by detecting the current flowing through the third switch SW3 based on the potential difference across the third switch SW3 can be used. . This is because when the second switch SW2 is off and the third switch SW3 is on, the current flowing through the third switch SW3 can be regarded as the current IL1 flowing through the first inductor L1.
　第２期間Ｐ２が終了した後も、制御部ＣＮＴ１は、第２インダクタＬ２を流れる電流ＩＬ２が減少して零になるまで、すなわちタイミングｔ５に到達するまで、第４スイッチＳＷ４をオンにし続ける。これにより、グランド電位から第４スイッチＳＷ４及び第２インダクタＬ２を経由して出力コンデンサＣＯＵＴ及び出力端子ＯＵＴに電流が流れる（図７参照）。したがって、スイッチング電源装置１は、第２ンダクタＬ２を流れる電流ＩＬ２を検出する第２電流検出部（不図示）を備える。第２電流検出部としては、例えば第４イッチＳＷ４の両端電位差により第４イッチＳＷ４を流れる電流を検出して間接的に第２インダクタＬ２を流れる電流ＩＬ２を検出する電流検出部を挙げることができる。第１スイッチＳＷ１がオフであり、第４スイッチＳＷ４がオンであるとき、第４スイッチＳＷ４を流れる電流は第２インダクタＬ２を流れる電流ＩＬ２とみなすことができるからである。 Even after the second period P2 ends, the control unit CNT1 keeps turning on the fourth switch SW4 until the current IL2 flowing through the second inductor L2 decreases to zero, that is, until timing t5 is reached. As a result, a current flows from the ground potential to the output capacitor COUT and the output terminal OUT via the fourth switch SW4 and the second inductor L2 (see FIG. 7). Therefore, the switching power supply device 1 includes a second current detector (not shown) that detects the current IL2 flowing through the second inductor L2. As the second current detection unit, for example, a current detection unit that detects the current IL2 flowing through the second inductor L2 by detecting the current flowing through the fourth switch SW4 based on the potential difference between both ends of the fourth switch SW4 can be used. . This is because when the first switch SW1 is off and the fourth switch SW4 is on, the current flowing through the fourth switch SW4 can be regarded as the current IL2 flowing through the second inductor L2.
　そして、制御部ＣＮＴ１は、第２期間Ｐ２が終了してから次の周期における第１期間Ｐ１が開始される迄の間、すなわち第１スイッチＳＷ１のターンオンの前に、第４スイッチＳＷ４をオンにする第２オン期間Ｏ２（タイミングｔ６からタイミングｔ７までの期間）を設ける。第２オン期間Ｏ２の開始時点（タイミングｔ６）では、第２インダクタＬ２を流れる電流ＩＬ２は零である。第２オン期間Ｏ２では、第４スイッチＳＷ４がオンになるため、第２インダクタＬ２を流れる電流ＩＬ２が負電流になる（図８参照）。そして、第２オン期間Ｏ２が終了すると、すなわちタイミングｔ７に到達すると、第４スイッチＳＷ４がオフになるため、第２接続ノードＮ２の電圧Ｖ２が上昇する。これにより、第１スイッチＳＷ１がターンオンするときの第１スイッチＳＷ１の両端電位差を小さく（理想的には零に）できるので、スイッチング電源装置１の高効率化を図ることができる。 Then, the control unit CNT1 turns on the fourth switch SW4 from the end of the second period P2 until the start of the first period P1 in the next cycle, that is, before the first switch SW1 is turned on. A second ON period O2 (period from timing t6 to timing t7) is provided. At the start of the second ON period O2 (timing t6), the current IL2 flowing through the second inductor L2 is zero. In the second ON period O2, the fourth switch SW4 is turned on, so the current IL2 flowing through the second inductor L2 becomes a negative current (see FIG. 8). Then, when the second ON period O2 ends, that is, when timing t7 is reached, the fourth switch SW4 is turned off, so that the voltage V2 of the second connection node N2 rises. As a result, the potential difference across the first switch SW1 when the first switch SW1 is turned on can be reduced (ideally to zero), so that the efficiency of the switching power supply 1 can be improved.
　また、制御部ＣＮＴ１は、第２スイッチＳＷ２をオンにするときはコンデンサＣｒの両端がそれぞれ低インピーダンス状態になるように、第２スイッチＳＷ２をオンにするときは常に第４スイッチＳＷ４をオンにしている。 The controller CNT1 always turns on the fourth switch SW4 when turning on the second switch SW2 so that both ends of the capacitor Cr are in a low impedance state when turning on the second switch SW2. there is
　さらに、制御部ＣＮＴ１は、コンデンサＣｒの両端電位差を略一定に保つために、各周期ＰＤにおいて第１期間Ｐ１の長さと第２期間Ｐ２の長さを揃えている。 Further, the control unit CNT1 makes the length of the first period P1 and the length of the second period P2 equal in each cycle PD in order to keep the potential difference across the capacitor Cr substantially constant.
＜用途＞
　次に、先に説明したスイッチング電源装置１の用途例について説明する。図９は、車載機器を搭載した車両の一構成例を示す外観図である。本構成例の車両Ｘは、車載機器Ｘ１１～Ｘ１７と、これらの車載機器Ｘ１１～Ｘ１７に電力を供給するバッテリ（不図示）と、を搭載している。 <Application>
Next, application examples of the switching power supply device 1 described above will be described. FIG. 9 is an external view showing a configuration example of a vehicle in which the in-vehicle device is mounted. The vehicle X of this configuration example is equipped with onboard devices X11 to X17 and a battery (not shown) that supplies power to these onboard devices X11 to X17.
　先に説明したスイッチング電源装置１が車両Ｘに搭載される場合、ＡＭラジオ放送の受信に悪影響が出ないようにＡＭ帯域の輻射ノイズを抑えることが求められる。したがって、制御部ＣＮＴ１が、第１接続ノードＮ１に、１．８ＭＨｚ以上２．１ＭＨｚ以下の電圧を発生させることが望ましい。すなわち、上述した各周期の固定値の逆数（スイッチング周波数）を１．８ＭＨｚ以上２．１ＭＨｚ以下にすることが望ましい。スイッチング周波数が１．８ＭＨｚ未満になると、ＡＭ帯域の輻射ノイズが増加し、スイッチング周波数が２．１ＭＨｚより大きくなると、スイッチング損失が許容範囲を超えるからである。 When the switching power supply device 1 described above is installed in the vehicle X, it is required to suppress radiation noise in the AM band so as not to adversely affect the reception of AM radio broadcasts. Therefore, it is desirable that the control unit CNT1 generates a voltage of 1.8 MHz or more and 2.1 MHz or less at the first connection node N1. That is, it is desirable to set the reciprocal (switching frequency) of the fixed value of each cycle to 1.8 MHz or more and 2.1 MHz or less. This is because if the switching frequency is less than 1.8 MHz, radiation noise in the AM band increases, and if the switching frequency is greater than 2.1 MHz, the switching loss exceeds the allowable range.
　車載機器Ｘ１１は、エンジンに関連する制御（インジェクション制御、電子スロットル制御、アイドリング制御、酸素センサヒータ制御、及び、オートクルーズ制御など）を行うエンジンコントロールユニットである。 The in-vehicle device X11 is an engine control unit that performs engine-related controls (injection control, electronic throttle control, idling control, oxygen sensor heater control, auto-cruise control, etc.).
　車載機器Ｘ１２は、ＨＩＤ［high　intensity  discharged  lamp］やＤＲＬ［daytime  running　lamp］などの点消灯制御を行うランプコントロールユニットである。 The in-vehicle device X12 is a lamp control unit that controls lighting and extinguishing of HID [high intensity discharged lamp] and DRL [daytime running lamp].
　車載機器Ｘ１３は、トランスミッションに関連する制御を行うトランスミッションコントロールユニットである。 The in-vehicle device X13 is a transmission control unit that performs controls related to the transmission.
　車載機器Ｘ１４は、車両Ｘの運動に関連する制御（ＡＢＳ［anti-lock  brake　system］制御、ＥＰＳ［electric　power  Steering］制御、電子サスペンション制御など）を行うボディコントロールユニットである。 The in-vehicle device X14 is a body control unit that performs controls related to the movement of the vehicle X (ABS [anti-lock brake system] control, EPS [electric power steering] control, electronic suspension control, etc.).
　車載機器Ｘ１５は、ドアロックや防犯アラームなどの駆動制御を行うセキュリティコントロールユニットである。 The in-vehicle device X15 is a security control unit that controls driving such as door locks and security alarms.
　車載機器Ｘ１６は、ワイパー、電動ドアミラー、パワーウィンドウ、電動サンルーフ、電動シート、及び、エアコンなど、標準装備品やメーカーオプション品として、工場出荷段階で車両Ｘに組み込まれている電子機器である。 In-vehicle equipment X16 is electronic equipment that is built into vehicle X at the factory shipment stage as standard equipment or manufacturer options, such as wipers, electric door mirrors, power windows, electric sunroofs, electric seats, and air conditioners.
　車載機器Ｘ１７は、車載Ａ／Ｖ［audio/visual］機器、カーナビゲーションシステム、及び、ＥＴＣ［Electronic　Toll　Collection　System］など、ユーザの任意で車両Ｘに装着される電子機器である。 The in-vehicle device X17 is an electronic device that the user arbitrarily attaches to the vehicle X, such as an in-vehicle A/V [audio/visual] device, a car navigation system, and an ETC [Electronic Toll Collection System].
　なお、先に説明したスイッチング電源装置１は、車載機器Ｘ１１～Ｘ１７のいずれにも組み込むことが可能である。 It should be noted that the switching power supply device 1 described above can be incorporated in any of the in-vehicle devices X11 to X17.
＜留意点＞
　なお、本発明の構成は、上記実施形態のほか、発明の主旨を逸脱しない範囲で種々の変更を加えることが可能である。上記実施形態は、全ての点で例示であって、制限的なものではないと考えられるべきであり、本発明の技術的範囲は、上記実施形態の説明ではなく、特許請求の範囲によって示されるものであり、特許請求の範囲と均等の意味及び範囲内に属する全ての変更が含まれると理解されるべきである。 <Points to note>
In addition to the above-described embodiment, the configuration of the present invention can be modified in various ways without departing from the gist of the invention. The above embodiments should be considered illustrative in all respects and not restrictive, and the technical scope of the present invention is indicated by the scope of claims rather than the description of the above embodiments. It should be understood that all modifications that fall within the meaning and range of equivalents of the claims are included.
　例えば、上記実施形態では、各周期において第１期間Ｐ１の長さと第２期間Ｐ２の長さを揃えることで、コンデンサＣ１の両端電位差を一定に保っている。しかしながら、例えば、第１期間Ｐ１の長さと第２期間Ｐ２の長さを揃えず、コンデンサＣ１の両端電位差を検出し、コンデンサＣ１の両端電位差の検出結果に応じて第１期間Ｐ１の長さと第２期間Ｐ２の長さとの比率を調整する構成にしてもよい。 For example, in the above embodiment, the potential difference across the capacitor C1 is kept constant by aligning the length of the first period P1 and the length of the second period P2 in each cycle. However, for example, the length of the first period P1 and the length of the second period P2 are not made the same. The configuration may be such that the ratio with the length of the two periods P2 is adjusted.
　また、上記実施形態では、第２スイッチＳＷ２がターンオンするタイミングと、第１インダクタＬ１を流れる電流ＩＬ１が零になるタイミングとが同一のタイミング（タイミングｔ３）であるが、第２スイッチＳＷ２がターンオンするタイミングは、第１インダクタＬ１を流れる電流ＩＬ１が零になるタイミングより前であってもよく、第１インダクタＬ１を流れる電流ＩＬ１が零になるタイミングより後であってもよい。ただし、第１インダクタＬ１を流れる電流ＩＬ１が零になるより前に第２スイッチＳＷ２がターンオンする場合、第２スイッチＳＷ２はゼロボルトスイッチングにならない。したがって、第１インダクタＬ１を流れる電流ＩＬ１が零になると同時に、又は、第１インダクタＬ１を流れる電流ＩＬ１が零になった後に、第２スイッチＳＷ２がターンオンすることが望ましい。 Further, in the above embodiment, the timing when the second switch SW2 is turned on and the timing when the current IL1 flowing through the first inductor L1 becomes zero are the same timing (timing t3), but the second switch SW2 is turned on. The timing may be before the timing at which the current IL1 flowing through the first inductor L1 becomes zero, or after the timing at which the current IL1 flowing through the first inductor L1 becomes zero. However, if the second switch SW2 turns on before the current IL1 flowing through the first inductor L1 becomes zero, the second switch SW2 will not be zero volt switching. Therefore, it is desirable to turn on the second switch SW2 at the same time as the current IL1 flowing through the first inductor L1 becomes zero or after the current IL1 flowing through the first inductor L1 becomes zero.
　以上説明したスイッチング電源装置（１）は、第１～第４スイッチ（ＳＷ１～ＳＷ４）と、コンデンサ（Ｃ１）と、前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成される制御部（ＣＮＴ１）と、を備え、前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成され、前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成され、前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成され、前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成され、前記制御部は、前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、を設けるように構成される構成（第１の構成）である。 The switching power supply device (1) described above is configured to control ON/OFF of each of the first to fourth switches (SW1 to SW4), the capacitor (C1), and the first to fourth switches. a control unit (CNT1), wherein the first switch is configured such that a first end of the first switch can be connected to an input voltage application end, and a second end of the first switch is connected to a second switch; The second switch is configured to be connectable to a first end and a first end of the capacitor, wherein the second switch connects a second end of the second switch to a first end of the third switch and a first end of the first inductor. the third switch is configured such that a second end of the third switch can be connected to a low voltage application end lower than the input voltage; one end of the switch is configured to be connectable to the second end of the capacitor and the first end of the second inductor, the second end of the fourth switch is configured to be connectable to the low voltage application end, and the control unit comprises , a first period of turning on the first switch, turning off the second switch, and turning off the fourth switch; turning on the second switch, turning off the first switch, and turning off the third switch; is turned off, and a second period during which the fourth switch is turned on (first configuration).
　上記第１の構成のスイッチング電源装置は、入力電圧と出力電圧との関係を変更することができる。 The switching power supply device having the first configuration can change the relationship between the input voltage and the output voltage.
　上記第１の構成のスイッチング電源装置において、前記制御部は、前記第２スイッチのターンオンの前に前記第３スイッチをオンにする第１オン期間を設けるように構成される構成（第２の構成）としてもよい。 In the switching power supply device of the first configuration, the control unit is configured to provide a first ON period for turning on the third switch before turning on the second switch (second configuration ).
　上記第２の構成のスイッチング電源装置は、第２スイッチがターンオンするときの第２スイッチの両端電位差を小さく（理想的には零に）できるので、高効率化を図ることができる。 In the switching power supply device having the second configuration, the potential difference between both ends of the second switch can be reduced (ideally zero) when the second switch is turned on, so efficiency can be improved.
　上記第１又は第２の構成のスイッチング電源装置において、前記制御部は、前記第１スイッチのターンオンの前に前記第４スイッチをオンにする第２オン期間を設けるように構成される構成（第３の構成）としてもよい。 In the switching power supply device having the first or second configuration, the control section is configured to provide a second ON period for turning on the fourth switch before turning on the first switch (the 3).
　上記第３の構成のスイッチング電源装置は、第１スイッチがターンオンするときの第１スイッチの両端電位差を小さく（理想的には零に）できるので、高効率化を図ることができる。 In the switching power supply device having the third configuration, the potential difference between both ends of the first switch can be reduced (ideally zero) when the first switch is turned on, so efficiency can be improved.
　上記第３の構成のスイッチング電源装置において、前記制御部は、前記第１オン期間及び前記第２オン期間の両方を設けるように構成され、前記第１オン期間の開始時に前記第１インダクタを流れる電流が零であり、前記第２オン期間の開始時に前記第２インダクタを流れる電流が零である構成（第４の構成）としてもよい。 In the switching power supply device having the third configuration, the control section is configured to provide both the first ON period and the second ON period, and the current flowing through the first inductor at the start of the first ON period. A configuration (fourth configuration) in which the current is zero and the current flowing through the second inductor at the start of the second ON period is also possible.
　上記第４の構成のスイッチング電源装置は、より一層高効率化を図ることができる。 The switching power supply device having the fourth configuration can achieve even higher efficiency.
　上記第１～第４いずれかの構成のスイッチング電源装置において、前記制御部は、前記第２スイッチをオンにするときは常に前記第４スイッチをオンにするように構成される構成（第５の構成）としてもよい。 In the switching power supply device having any one of the first to fourth configurations, the control unit is configured to always turn on the fourth switch when turning on the second switch (fifth configuration).
　上記第５の構成のスイッチング電源装置は、第２スイッチをオンにするときにコンデンサの両端をそれぞれ低インピーダンス状態にできる。 The switching power supply device having the fifth configuration can bring both ends of the capacitor into a low impedance state when turning on the second switch.
　上記第１～第５いずれかの構成のスイッチング電源装置において、前記制御部は、各周期において前記第１期間の長さと前記第２期間の長さを揃えるように構成される構成（第６の構成）としてもよい。 In the switching power supply device having any one of the first to fifth configurations, the control unit is configured to match the length of the first period and the length of the second period in each period (sixth configuration).
　上記第６の構成のスイッチング電源装置は、コンデンサの両端電位差を一定に保つことができる。 The switching power supply device having the sixth configuration can keep the potential difference across the capacitor constant.
　上記第２の構成のスイッチング電源装置において、前記制御部は、前記第１オン期間を前記第１期間内に含むように構成される構成（第７の構成）としてもよい。 In the switching power supply device having the second configuration, the control section may be configured to include the first ON period within the first period (seventh configuration).
　上記第７の構成のスイッチング電源装置は、例えば第１期間の前半を第１オン期間とし、第１期間の後半を非第１オン期間とすることで、第１期間の後半において第２スイッチと第３スイッチとの接続ノードの電圧を上昇させることができる。 In the switching power supply device having the seventh configuration, for example, the first half of the first period is set as the first ON period, and the second half of the first period is set as the non-first ON period. The voltage of the connection node with the third switch can be increased.
　以上説明したスイッチ制御装置（ＣＮＴ１）は、第１～第４スイッチ（ＳＷ１～ＳＷ４）と、コンデンサ（Ｃ１）と、を備え、前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成され、前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成され、前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成され、前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成される、スイッチング電源装置の一部であって、前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成され、前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、を設けるように構成される構成（第８の構成）である。 The switch control device (CNT1) described above includes first to fourth switches (SW1 to SW4) and a capacitor (C1). the second end of the first switch is connectable to the first end of the second switch and the first end of the capacitor, and the second switch is configured to be connectable to the application end of the second switch is connectable to the first end of the third switch and the first end of the first inductor, the third switch being configured such that the second end of the third switch is lower than the input voltage; a first end of the fourth switch is connectable to a second end of the capacitor and a first end of the second inductor; A part of a switching power supply device, wherein a second end of a switch is configured to be connectable to the low voltage application end, and is configured to control on/off of each of the first to fourth switches, a first period in which the first switch is turned on, the second switch is turned off, and the fourth switch is turned off; and the second switch is turned on, the first switch is turned off, and the third switch is turned off. and a second period during which the fourth switch is turned off and the fourth switch is turned on (eighth configuration).
　上記第８の構成のスイッチ制御装置は、スイッチング電源装置における入力電圧と出力電圧との関係を変更することができる。 The switch control device having the eighth configuration can change the relationship between the input voltage and the output voltage in the switching power supply device.
　以上説明した車載機器は、上記第１～第７いずれかの構成のスイッチング電源装置又は上記第８の構成のスイッチ制御装置を備える構成（第９の構成）である。 The vehicle-mounted device described above has a configuration (ninth configuration) including the switching power supply device having any one of the first to seventh configurations or the switch control device having the eighth configuration.
　上記第９の構成の車載機器（Ｘ１１～Ｘ１７）は、スイッチング電源装置における入力電圧と出力電圧との関係を変更することができる。 The vehicle-mounted devices (X11 to X17) having the ninth configuration can change the relationship between the input voltage and the output voltage in the switching power supply.
　以上説明した車両（Ｘ）は、上記第９の構成の車載機器と、前記車載機器に電力を供給するバッテリと、を備える構成（第１０の構成）である。 The vehicle (X) described above has a configuration (tenth configuration) including the vehicle-mounted device of the ninth configuration and a battery that supplies power to the vehicle-mounted device.
　上記第１０の構成の車両は、スイッチング電源装置における入力電圧と出力電圧との関係を変更することができる。 The vehicle having the tenth configuration can change the relationship between the input voltage and the output voltage in the switching power supply.
　　　１　一実施形態に係るスイッチング電源装置
　　　Ｃ１　コンデンサ
　　　ＣＯＵＴ　出力コンデンサ
　　　ＣＮＴ１　制御部
　　　ＦＢ１　出力帰還部
　　　Ｌ１　第１インダクタ
　　　Ｌ２　第２インダクタ
　　　ＬＤ１　負荷
　　　ＳＷ１～ＳＷ４　第１～第４スイッチ
　　　Ｘ　車両
　　　Ｘ１１～Ｘ１７　車載機器 1 switching power supply device according to one embodiment C1 capacitor COUT output capacitor CNT1 control unit FB1 output feedback unit L1 first inductor L2 second inductor LD1 load SW1 to SW4 first to fourth switches X vehicle X11 to X17 onboard equipment

Claims (10)

  1. 　第１～第４スイッチと、コンデンサと、前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成される制御部と、を備え、
    　前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成され、
    　前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成され、
    　前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成され、
    　前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成され、
    　前記制御部は、
    　前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、
    　前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、
    を設けるように構成される、スイッチング電源装置。     first to fourth switches, a capacitor, and a controller configured to control on/off of each of the first to fourth switches;
    The first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to connect to
    the second switch is configured such that a second end of the second switch can be connected to a first end of the third switch and a first end of the first inductor;
    The third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage,
    The fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. configured to be connectable to the end,
    The control unit
    a first period during which the first switch is turned on, the second switch is turned off, and the fourth switch is turned off;
    a second period during which the second switch is turned on, the first switch is turned off, the third switch is turned off, and the fourth switch is turned on;
    A switching power supply configured to provide a
  2. 　制御部は、前記第２スイッチのターンオンの前に前記第３スイッチをオンにする第１オン期間を設けるように構成される、請求項１に記載のスイッチング電源装置。 3. The switching power supply according to claim 1, wherein the control unit is configured to provide a first ON period for turning on the third switch before turning on the second switch.
  3. 　制御部は、前記第１スイッチのターンオンの前に前記第４スイッチをオンにする第２オン期間と、を設けるように構成される、請求項１又は請求項２に記載のスイッチング電源装置。 3. The switching power supply device according to claim 1, wherein the control unit is configured to provide a second ON period during which the fourth switch is turned ON before the first switch is turned ON.
  4. 　制御部は、前記第１オン期間及び前記第２オン期間の両方を設けるように構成され、
    　前記第１オン期間の開始時に前記第１インダクタを流れる電流が零であり、前記第２オン期間の開始時に前記第２インダクタを流れる電流が零である、請求項３に記載のスイッチング電源装置。     The control unit is configured to provide both the first ON period and the second ON period,
    4. The switching power supply according to claim 3, wherein a current flowing through said first inductor at the start of said first ON period is zero, and a current flowing through said second inductor at the start of said second ON period is zero.
  5. 　前記制御部は、
    　前記第２スイッチをオンにするときは常に前記第４スイッチをオンにするように構成される、請求項１～４のいずれか一項に記載のスイッチング電源装置。     The control unit
    5. The switching power supply device according to claim 1, configured to turn on said fourth switch whenever said second switch is turned on.
  6. 　前記制御部は、
    　各周期において前記第１期間の長さと前記第２期間の長さを揃えるように構成される、請求項１～５のいずれか一項に記載のスイッチング電源装置。     The control unit
    6. The switching power supply device according to claim 1, wherein the length of said first period and the length of said second period are made equal in each period.
  7. 　前記制御部は、
    　前記第１オン期間を前記第１期間内に含むように構成される、請求項２に記載のスイッチング電源装置。     The control unit
    3. The switching power supply according to claim 2, configured to include said first ON period within said first period.
  8. 　第１～第４スイッチと、コンデンサと、を備え、
    　前記第１スイッチは、前記第１スイッチの第１端が入力電圧の印加端に接続可能に構成され、前記第１スイッチの第２端が第２スイッチの第１端及び前記コンデンサの第１端に接続可能に構成され、
    　前記第２スイッチは、前記第２スイッチの第２端が前記第３スイッチの第１端及び第１インダクタの第１端に接続可能に構成され、
    　前記第３スイッチは、前記第３スイッチの第２端が前記入力電圧よりも低い低電圧の印加端に接続可能に構成され、
    　前記第４スイッチは、前記第４スイッチの第１端が前記コンデンサの第２端及び第２インダクタの第１端に接続可能に構成され、前記第４スイッチの第２端が前記低電圧の印加端に接続可能に構成される、スイッチング電源装置の一部であって、
    　前記第１～前記第４スイッチそれぞれのオン／オフを制御するよう構成され、
    　前記第１スイッチをオンにし、前記第２スイッチをオフにし、前記第４スイッチをオフにする第１期間と、
    　前記第２スイッチをオンにし、前記第１スイッチをオフにし、前記第３スイッチをオフにし、前記第４スイッチをオンにする第２期間と、
    を設けるように構成される、スイッチ制御装置。     comprising first to fourth switches and a capacitor,
    The first switch is configured such that a first terminal of the first switch can be connected to an application terminal of an input voltage, and a second terminal of the first switch is connected to a first terminal of the second switch and a first terminal of the capacitor. configured to connect to
    the second switch is configured such that a second end of the second switch can be connected to a first end of the third switch and a first end of the first inductor;
    The third switch is configured such that a second terminal of the third switch can be connected to a low voltage application terminal lower than the input voltage,
    The fourth switch is configured such that a first end of the fourth switch can be connected to a second end of the capacitor and a first end of a second inductor, and a second end of the fourth switch is adapted to apply the low voltage. A part of a switching power supply configured to be connectable to an end of
    configured to control on/off of each of the first to fourth switches;
    a first period during which the first switch is turned on, the second switch is turned off, and the fourth switch is turned off;
    a second period during which the second switch is turned on, the first switch is turned off, the third switch is turned off, and the fourth switch is turned on;
    A switch control device configured to provide a
  9. 　請求項１～７のいずれか一項に記載のスイッチング電源装置又は請求項８に記載のスイッチ制御装置を備える、車載機器。 An in-vehicle device comprising the switching power supply device according to any one of claims 1 to 7 or the switch control device according to claim 8.
  10. 　請求項９に記載の車載機器と、
    　前記車載機器に電力を供給するバッテリと、
    　を備える、車両。     An in-vehicle device according to claim 9;
    a battery that supplies power to the in-vehicle device;
    a vehicle.
PCT/JP2022/007207 2021-03-09 2022-02-22 Switching power supply device, switch control device, in-vehicle device, and vehicle WO2022190856A1 (en)

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JP2006223088A (en) * 2005-01-14 2006-08-24 Oita Univ Multiple phase switching converter and control method thereof
JP2013510548A (en) * 2009-11-09 2013-03-21 エスエムエー ソーラー テクノロジー アーゲー Buck converter and inverter including it
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