WO2019225394A1 - Dispositif d'alimentation électrique à bord d'un véhicule - Google Patents

Dispositif d'alimentation électrique à bord d'un véhicule Download PDF

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Publication number
WO2019225394A1
WO2019225394A1 PCT/JP2019/019067 JP2019019067W WO2019225394A1 WO 2019225394 A1 WO2019225394 A1 WO 2019225394A1 JP 2019019067 W JP2019019067 W JP 2019019067W WO 2019225394 A1 WO2019225394 A1 WO 2019225394A1
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WIPO (PCT)
Prior art keywords
conductive path
voltage
switching element
power supply
unit
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PCT/JP2019/019067
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English (en)
Japanese (ja)
Inventor
貴史 川上
一輝 増田
息吹 河村
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
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Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2019225394A1 publication Critical patent/WO2019225394A1/fr

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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 present invention relates to an in-vehicle power supply device.
  • the power supply (battery or the like) may be electrically separated from other components by a contactor and may be on standby.
  • a contactor when the contactor is turned on, an inrush current flows into a capacitive component (for example, a capacitive component of the load) disconnected from the power supply during standby, which may cause damage to the contactor.
  • Patent Document 1 a plurality of shunt circuits are provided in such a manner that a plurality of circuits in which a resistor and a switch are connected in series are connected in parallel so that a charging current flows in stages. Yes.
  • Patent Document 1 when a large-capacity capacitive component exists, it is necessary to increase the number of parallel operations, and there is a problem that the circuit configuration becomes large.
  • the present invention has been made to solve at least one of the above-described problems, and can perform a precharge operation on a capacitive component existing on one side of a voltage conversion unit, and a current during the precharge operation.
  • An object of the present invention is to more easily realize a configuration capable of controlling the above.
  • the in-vehicle power supply device includes: On-vehicle performing at least a voltage conversion operation for converting a voltage applied to a first conductive path serving as a power supply path from the first power supply unit and applying an output voltage to a second conductive path disposed on the second power supply unit side
  • a voltage conversion unit that performs a voltage conversion operation to increase or decrease a voltage and apply the voltage to the second conductive path; Provided in the second conductive path, allows current to flow from the second power supply unit side to the voltage conversion unit side in the second conductive path during an on operation, and from the second power supply unit side during an off operation.
  • a protective switching element that cuts off the flow of current to the voltage converter,
  • a second inductor provided in series with the protective switching element between the voltage converter in the second conductive path and the protective switching element;
  • a semiconductor element portion comprising a diode or a switching element having one end electrically connected between the second inductor and the protective switching element in the second conductive path and the other end electrically connected to a ground portion;
  • a control unit for outputting the first control signal to at least the driving switching element;
  • the protective switching element, the second inductor, and the semiconductor element unit wherein the second conductive path has the voltage conversion unit side as an output side conductive path and the side opposite to the voltage conversion unit side as an input side
  • a charging circuit that conducts a second voltage conversion operation in which a voltage applied to the input-side conductive path is stepped down and applied to the output-side conductive path according to an on / off operation of the protective switching element. Part is composed, The control unit outputs a second control signal in which an on signal and an off signal are alternate
  • the control circuit gives the second control signal to the charging circuit unit according to establishment of a predetermined precharge condition, so that the charging circuit unit is connected to the first conductive path side. It operates to supply a charging current. Therefore, it is possible to charge the capacitance component on the first conductive path side when a predetermined precharge condition is satisfied.
  • the charging current can be controlled by the on / off operation of the switch unit, a configuration capable of controlling the current during the precharging operation can be realized more easily.
  • FIG. 1 is a circuit diagram schematically illustrating an in-vehicle power supply system including an in-vehicle power supply device according to a first embodiment. Operation mode, precharge operation state, high voltage side voltage, contactor state, control for protective switching element T3, drive switching before, during, and after precharge operation in the in-vehicle power supply device of Embodiment 1 It is a timing chart which illustrates the change of the state of control with respect to element T1, T2, and the switching element T4 for short circuit protection. It is explanatory drawing explaining the control method of another Example.
  • the vehicle-mounted power supply device may include a voltage detection unit that detects the voltage value of the first conductive path.
  • the control unit outputs the second control signal to the protection switching element of the charging circuit unit in response to the establishment of the precharge condition, and then the voltage value of the first conductive path detected by the voltage detection unit becomes a predetermined value.
  • the voltage converter may be configured to boost the voltage applied to the second conductive path and apply the voltage to the first conductive path. According to this configuration, when the precharge operation is performed on the capacitance component on the first conductive path side, the boost charge can be performed after the step-down charge, and the charge voltage of the capacitance component is set to the second conductivity. The voltage can be increased to a voltage higher than the voltage of the road.
  • control unit may be configured to control the duty of the second control signal so that the value of the current flowing through the first conductive path is a predetermined target current value. This makes it possible to charge the capacitance component while controlling the current in the first conductive path to a desired value during the precharge operation.
  • An in-vehicle power supply system 100 shown in FIG. 1 includes a first power supply unit 91 and a second power supply unit 92 configured as an in-vehicle power supply unit, and an in-vehicle power supply device 1 (hereinafter also simply referred to as a power supply device 1). And is configured as a system that can supply power to a load (not shown) mounted on the vehicle (for example, a load electrically connected to the first conductive path 21 or the second conductive path 22).
  • the load is a vehicle-mounted electrical component, and the type and number thereof are not limited.
  • the first power supply unit 91 is configured by power storage means such as a lithium ion battery or an electric double layer capacitor, for example, and generates a first predetermined voltage.
  • the terminal on the high potential side of the first power supply unit 91 is kept at a predetermined voltage (for example, 24 V or 48 V), and the terminal on the low potential side is kept at the ground potential (0 V).
  • a terminal on the high potential side of the first power supply unit 91 is electrically connected to a wiring unit 81 provided in the vehicle, and the first power supply unit 91 applies a predetermined voltage to the wiring unit 81.
  • the terminal on the low potential side of the first power supply unit 91 is electrically connected to a reference conductive path 83 configured as a ground part in the vehicle.
  • the wiring portion 81 is connected to the input side terminal MV of the power supply device 1 and is electrically connected to the first conductive path 21 via the input side terminal MV.
  • the second power supply unit 92 is constituted by power storage means such as a lead storage battery, for example, and generates a second predetermined voltage lower than the first predetermined voltage generated by the first power supply unit 91.
  • the terminal on the high potential side of the second power supply unit 92 is maintained at 12V, and the terminal on the low potential side is maintained at the ground potential (0V).
  • a terminal on the high potential side of the second power supply unit 92 is electrically connected to a wiring unit 82 provided in the vehicle, and the second power supply unit 92 applies a predetermined voltage to the wiring unit 82.
  • a terminal on the low potential side of the second power supply unit 92 is electrically connected to the reference conductive path 83.
  • the wiring part 82 is connected to the output side terminal LV of the power supply device 1 and is electrically connected to the second conductive path 22 via the output side terminal LV.
  • the reference conductive path 83 is configured as a vehicle ground and is maintained at a constant ground potential (0 V).
  • the reference conductive path 83 is electrically connected to the low potential side terminal of the first power supply unit 91 and the low potential side terminal of the second power supply unit 92, and the ground portion of the power supply apparatus 1 is not shown. It is electrically connected through the ground terminal.
  • the power supply device 1 is configured as an in-vehicle step-up / step-down DCDC converter that is mounted and used in a vehicle.
  • the power supply apparatus 1 mainly includes a first conductive path 21, a second conductive path 22, a third conductive path 23, a voltage conversion unit 10, a control unit 30, voltage detection units 41 and 42, current detection units 43 and 44, and a charging circuit.
  • Part 50 protective switching elements T3 and T4, input side terminal MV, output side terminal LV and the like.
  • the first conductive path 21 is a conductive path serving as a power supply path from the first power supply unit 91, and is configured as a primary (high voltage side) power supply line to which a relatively high voltage is applied.
  • the first conductive path 21 is electrically connected to one end side of the wiring portion 81 and is electrically connected to the high potential side terminal of the first power supply portion 91 via the wiring portion 81 when the contactor CT is in the ON state.
  • a predetermined DC voltage is applied from the first power supply unit 91.
  • an input side terminal MV is provided at an end portion of the first conductive path 21, and a wiring portion 81 is electrically connected to the input side terminal MV.
  • the second conductive path 22 is a conductive path disposed closer to the second power supply unit 92 than the voltage conversion unit 10, and is configured as a secondary (low voltage side) power supply line to which a relatively low voltage is applied. ing.
  • the second conductive path 22 is electrically connected to the wiring part 82, is electrically connected to the high potential side terminal of the second power supply part 92 via the wiring part 82, and is connected to the second power supply part 92 from the second power supply part 92. 1 DC power voltage smaller than the output voltage of the power supply unit 91 is applied.
  • an output side terminal LV is provided at an end of the second conductive path 22, and a wiring portion 82 is electrically connected to the output side terminal LV.
  • the voltage conversion unit 10 is provided between the first conductive path 21 and the second conductive path 22 and is configured as a semiconductor switching element electrically connected to the first conductive path 21.
  • a switching element T1 Between the element T1 (hereinafter also simply referred to as a switching element T1) and the first conductive path 21 and the third conductive path 23 (conductive path maintained at a predetermined reference potential lower than the potential of the first conductive path 21).
  • a low-side driving switching element T2 (hereinafter also simply referred to as a switching element T2) configured as a semiconductor switching element electrically connected to the switching element T1, between the switching element T1 and the switching element T2, and the second conductive path 22.
  • a first inductor L1 hereinafter also referred to as an inductor L1 electrically connected to.
  • the voltage conversion unit 10 is a main part of the switching-type step-down DCDC converter, and steps down the voltage applied to the first conductive path 21 by switching the on / off operation of the switching element T1 and outputs the voltage to the second conductive path 22.
  • a step-down operation can be performed.
  • the voltage conversion unit 10 can perform a boosting operation of boosting the voltage applied to the second conductive path 22 by switching the on / off operation of the switching element T2 and outputting the boosted voltage to the first conductive path 21.
  • a capacitor C2 is provided between the first conductive path 21 and the third conductive path 23, and a capacitor C3 is provided between the second conductive path 22 and the third conductive path 23. Yes.
  • the capacitor C2 has one end electrically connected to a portion of the first conductive path 21 between the switching element T4 and the switching element T1 and the other end electrically connected to the third conductive path 23.
  • the capacitor C2 is a smoothing capacitor on the first conductive path 21 side in the voltage conversion unit 10, and functions as an input capacitor of the voltage conversion unit 10 (DCDC converter) when the voltage conversion unit 10 performs a step-down operation.
  • DCDC converter voltage conversion unit 10
  • the capacitor C3 is a smoothing capacitor on the second conductive path 22 side in the voltage conversion unit 10, and functions as an output capacitor of the voltage conversion unit 10 (DCDC converter) when the voltage conversion unit 10 performs a step-down operation.
  • DCDC converter voltage conversion unit 10
  • Both the switching element T1 and the switching element T2 are configured as N-channel MOSFETs, and one end of the first conductive path 21 is connected to the drain of the switching element T1 on the high side.
  • the drain of the switching element T1 is electrically connected to one electrode of the capacitor C2 and also electrically connected to the high potential side terminal of the first power supply unit 91 via the first conductive path 21 and the wiring unit 81. It is the structure which can be done, and can conduct
  • a driving signal and a non-driving signal (specifically, a PWM signal) from the control unit 30 are input to the gate of the switching element T1, and the switching element T1 is changed according to the signal from the control unit 30. It is switched between an on state and an off state.
  • a PWM signal a non-driving signal
  • the third conductive path 23 is connected to the source of the switching element T2 on the low side.
  • the third conductive path 23 is a conductive path electrically connected to a reference conductive path 83 (ground portion) in the vehicle, and is maintained at a potential approximately equal to the potential (0 V) of the reference conductive path 83 as a ground. Function.
  • the third conductive path 23 is electrically connected to the electrodes on the other side of the capacitors C2 and C3.
  • a driving signal and a non-driving signal from the control unit 30 are also input to the gate of the switching element T2 on the low side, and the switching element T2 is turned on and off according to the signal from the control unit 30. It has come to switch to.
  • the inductor L1 has one end connected to a connection portion between the switching element T1 and the switching element T2, and one end thereof is electrically connected to the source of the switching element T1 and the drain of the switching element T2.
  • the other end of the inductor L1 is connected to the second conductive path 22 (specifically, a portion of the second conductive path 22 closer to the voltage conversion unit 10 than the second inductor L2).
  • the current detection unit 43 includes a resistor R1 and a differential amplifier 43B, and has a value indicating the current flowing through the first conductive path 21 (specifically, an analog voltage corresponding to the value of the current flowing through the first conductive path 21). ) Is output.
  • the voltage drop generated in the resistor R1 due to the current flowing through the first conductive path 21 is amplified by the differential amplifier 43B, becomes a detection voltage (analog voltage) corresponding to the current, and is input to the control unit 30.
  • the detected voltage (analog voltage) is converted into a digital value by an A / D converter (not shown) provided in the control unit 30.
  • the current detection unit 44 includes a resistance unit R2 and a differential amplifier 44B, and has a value indicating the current flowing through the second conductive path 22 (specifically, an analog voltage corresponding to the value of the current flowing through the second conductive path 22). ) Is output.
  • the voltage drop generated in the resistance unit R2 due to the current flowing through the second conductive path 22 is amplified by the differential amplifier 44B, becomes a detection voltage (analog voltage) corresponding to the current, and is input to the control unit 30.
  • the detected voltage (analog voltage) is converted into a digital value by an A / D converter (not shown) provided in the control unit 30.
  • the voltage detection unit 41 is connected to the first conductive path 21 and is configured to input a value corresponding to the voltage of the first conductive path 21 to the control unit 30.
  • the voltage detection unit 41 can input a value indicating the voltage of the first conductive path 21 (a value specifying a potential difference between the potential of the first conductive path 21 and the potential of the reference conductive path 83) to the control unit 30.
  • the detection circuit is configured as a conductive path that inputs a voltage value at a predetermined position of the first conductive path 21 to the control unit 30, but the voltage of the first conductive path 21 is divided.
  • the voltage dividing circuit may be configured to be input to the control unit 30.
  • the voltage detector 42 is connected to the second conductive path 22 and specifies a value corresponding to the voltage of the second conductive path 22 (a potential difference between the potential of the second conductive path 22 and the potential of the reference conductive path 83). A value to be input to the control unit 30.
  • the voltage detection unit 42 may be a known voltage detection circuit that can input a value indicating the voltage of the second conductive path 22 to the control unit 30. In the example of FIG. 1, the voltage at a predetermined position of the second conductive path 22 is used. Although it is configured as a conductive path that inputs a value to the control unit 30, it may be configured as a voltage dividing circuit that divides the voltage of the second conductive path 22 and inputs it to the control unit 30.
  • the protective switching element T4 is interposed in the first conductive path 21, and cancels the off state in which the flow of current from the first power supply section 91 side to the voltage conversion section 10 side in the first conductive path 21 is blocked. It is configured to switch to the on state.
  • the protective switching element T3 functions as a backflow prevention switching element, is interposed in the second conductive path 22, and is supplied with a voltage from the second power supply section 92 side in the second conductive path 22. It is configured to switch between an off state in which the flow of current to the conversion unit 10 side is blocked and an on state in which the block is released.
  • the protective switching element T3 provided in the second conductive path 22 allows a current to flow from the second power supply unit 92 side to the voltage conversion unit 10 side in the second conductive path 22 during the ON operation. During the off operation, the flow of current from the second power supply unit 92 side to the voltage conversion unit 10 side is interrupted.
  • the second inductor L2 is a filter inductor, is configured as a known coil, and is provided in series with the protective switching element T3.
  • the second inductor L2 has an inductance smaller than that of the first inductor L1, and one end thereof is electrically connected to the first inductor L1 and the capacitor C3.
  • the capacitor C1 is a noise removing capacitor on the first conductive path 21 side, and one end is electrically connected between the current detection resistor R1 and the input side terminal MV, and the other end is the third conductive path. 23 (ground portion) is electrically connected.
  • the capacitor C4 is a noise removing capacitor on the second conductive path 22 side, and one end is between the current detection resistor R2 and the output side terminal LV (specifically, the switching element T3 and the output side terminal LV). And the other end is electrically connected to the third conductive path 23 (ground portion).
  • the charging circuit unit 50 is configured to include the protective switching element T3 and the second inductor L2 described above and a switching element T6 as a semiconductor element unit.
  • the switching element T6 is configured as, for example, an N-channel FET, and has a drain between the second inductor L2 and the switching element T3 (specifically, between the second inductor L2 and the resistor portion R2). It is electrically connected and the source is electrically connected to the third conductive path 23 (ground portion).
  • the second inductor L2 filter coil
  • the protective switching element T3 functions as a high-side switching element
  • the switching element T6 functions as a low-side switching element. The operation of the charging circuit unit 50 will be described later.
  • the control unit 30 includes, for example, a control circuit and a drive unit.
  • the control circuit is configured as a microcomputer, for example, a CPU for performing various arithmetic processes, a ROM for storing information such as programs, a RAM for storing temporarily generated information, and converting an input analog voltage into a digital value A / D converter and the like are provided.
  • the A / D converter includes detection signals from the voltage detection units 41 and 42 (analog voltage signals corresponding to the detection voltages) and detection signals from the current detection units 43 and 44 (analog voltage signals corresponding to the detection currents). ) Is given.
  • the control unit 30 causes the voltage conversion unit 10 to perform a step-down operation, for example, the voltage value detected by the voltage detection unit 42 (the value of the voltage applied to the second conductive path 22) and a predetermined target voltage
  • the feedback calculation for calculating the duty by a known feedback calculation method (a known PI calculation method, a known PID calculation method, etc.) is periodically repeated based on the deviation from the value, and every time the duty is calculated, a new duty is calculated.
  • the PWM signal (first control signal) is given to the switching element T1
  • a PWM signal complementary to the PWM signal given to the switching element T1 is given to the switching element T2 while setting a dead time.
  • the voltage conversion unit 10 performs a boosting operation, a deviation between the voltage value detected by the voltage detection unit 41 (the value of the voltage applied to the first conductive path 21) and a predetermined target voltage value is obtained.
  • a known feedback calculation method known PI calculation method, known PID calculation method, etc.
  • the feedback calculation for calculating the duty is periodically repeated, and a PWM signal is output with a new duty every time the duty is calculated. .
  • the PWM signal is given to the switching element T2, and the PWM signal complementary to the PWM signal given to the switching element T2 is given to the switching element T1 while setting the dead time.
  • the power supply device 1 functions as a synchronous rectification step-down DCDC converter, turns on and off the high-side switching element T1 in accordance with the PWM signal (first control signal), and controls the low-side switching element T2.
  • the DC voltage applied to the first conductive path 21 is stepped down and output to the second conductive path 22.
  • the voltage (output voltage) applied to the second conductive path 22 is determined according to the duty of the PWM signal (first control signal) applied to the gate of the switching element T1.
  • the power supply device 1 also functions as a synchronous rectification step-up DCDC converter, which turns on and off the low-side switching element T2 according to the PWM signal and turns on and off the high-side switching element T1.
  • the DC voltage applied to the second conductive path 22 is boosted and output to the first conductive path 21.
  • the voltage (output voltage) applied to the first conductive path 21 at this time is determined according to the duty of the PWM signal applied to the gate of the switching element T2.
  • the charging circuit unit 50 functions as a synchronous rectification step-down DCDC converter.
  • the voltage conversion unit 10 side is set as the output side conductive path 22B, and the voltage conversion unit 10 side is The opposite side (second power supply unit 92 side) is the input side conductive path 22A, and the voltage applied to the input side conductive path 22A is stepped down and output to the output side conductive path 22B according to the on / off operation of the protective switching element T3.
  • a second voltage conversion operation for applying a voltage can be performed.
  • the charging circuit unit 50 protects the PWM signal that is the second control signal (a control signal in which an on signal and an off signal are switched alternately) from the control unit 30 in response to establishment of a predetermined precharge condition. Is applied to the switching element T3, and the protection switching element T3 is turned on / off in response to the PWM signal, so that the voltage applied to the input side conductive path 22A is stepped down and the output voltage is applied to the output side conductive path 22B. The step-down operation is performed.
  • the control unit 30 causes the charging circuit unit 50 to perform the second voltage conversion operation
  • the control unit 30 provides a PWM signal (second control signal) to the switching element T3 and is complementary to the PWM signal applied to the switching element T3.
  • the PWM signal is given to the switching element T6 while setting the dead time.
  • the input-side conductive path 22A By performing the ON operation and the OFF operation of the high-side switching element T3 in synchronization with the OFF operation and the ON operation of the low-side switching element T6 by such complementary PWM signals, the input-side conductive path 22A.
  • the DC voltage applied to is stepped down and applied to the output side conductive path 22B.
  • the inductance of the second inductor L2 (choke coil) is suppressed to be smaller than the inductance of the first inductor L1 (main coil) (for example, as small as about 1/10).
  • the frequency of the second control signal (PWM signal) given from the control unit 30 to the protective switching element T3 during the precharge step-down operation is the same as when the voltage conversion unit 10 is driven during the normal operation. It is desirable that the frequency be higher than the frequency of the first control signal (PWM signal for driving the driving switching element T1). Further, when the charging circuit unit 50 performs the step-down operation in this manner, the driving switching element T1 may be maintained in the off state or may be switched to the on state.
  • the charging circuit unit 50 configured as a synchronous rectification method is illustrated here, the switching element T6 may be replaced with a diode and configured as a diode rectification DCDC converter.
  • the control unit 30 of the power supply device 1 drives the voltage conversion unit 10 in accordance with establishment of a predetermined start condition, and performs a voltage conversion operation. Specifically, when a predetermined start switch (for example, a known ignition switch) for switching the vehicle system from the operation stop state to the operation state is in an ON state, a predetermined system ON signal (for example, when a start switch is in an off state, a predetermined system off signal (for example, an ignition off signal) is given from the external device to the control unit 30. It has become.
  • the control unit 30 gives a control signal to the voltage conversion unit 10 as a “predetermined precharge condition” that the start switch has been switched from an off state to an on state, and causes the voltage conversion unit 10 to perform a voltage conversion operation.
  • the control unit 30 controls the voltage conversion unit 10 in the flow as shown in FIG.
  • the control unit 30 detects the protection switching element T ⁇ b> 3 of the charging circuit unit 50 at the establishment timing t ⁇ b> 1 of the “predetermined precharge condition” (for example, the timing at which the start switch is switched from the off state to the on state).
  • a PWM signal (second control signal) is output to cause the charging circuit unit 50 to perform a charging operation (the above-described step-down operation).
  • Such an operation is a precharge operation (specifically, a precharge step-down operation).
  • the voltage value of the first conductive path 21 is a first predetermined value (for example, the second power supply unit 92).
  • the switching elements T1 and T2 of the voltage conversion unit 10 may be maintained in the off state, or only the switching element T1 may be in the on state.
  • the control unit 30 monitors the current value detected by the current detection unit 43 between the time t1 and the time t2 during which the precharge step-down operation is performed, and sets the value of the current flowing through the first conductive path 21 to a predetermined target current value.
  • the known feedback control is performed so that the duty of the PWM signal (second control signal) given to the protective switching element T3 is controlled.
  • a known feedback calculation method (known PI) is based on the deviation between the current value detected by the current detection unit 43 (value of the voltage flowing through the first conductive path 21) and a predetermined target current value.
  • the feedback calculation for calculating the duty by a calculation method or a known PID calculation method is periodically repeated, and each time the duty is calculated, a PWM signal for the protection switching element T3 is output with a new duty.
  • the precharge step-down operation is performed while the value of the current flowing through the first conductive path 21 is controlled to be constant.
  • the control unit 30 stops the PWM signal applied to the protective switching element T3 at time t2 when the voltage value of the first conductive path 21 becomes the first predetermined value, and switches the protective switching element T3 to the on state. Then, from time t3 thereafter, the voltage converter 10 is caused to perform a boosting operation. In this step-up operation, the value of the current flowing through the first conductive path 21 is set as a predetermined target current value while monitoring the current value detected by the current detection unit 43 while maintaining the protective switching element T3 in the on state. As described above, known feedback control is performed to control the duty of the PWM signal applied to the driving switching element T2.
  • a known feedback calculation method (known PI) is based on the deviation between the current value detected by the current detection unit 43 (value of the voltage flowing through the first conductive path 21) and a predetermined target current value.
  • a feedback calculation for calculating the duty by a calculation method or a known PID calculation method is periodically repeated, and each time the duty is calculated, a PWM signal applied to the switching element T2 is output with a new duty. Then, the PWM signal is given to the switching element T2, and the PWM signal complementary to the PWM signal given to the switching element T2 is given to the switching element T1 while setting the dead time.
  • the voltage value of the first conductive path 21 becomes a second predetermined value (for example, a predetermined value that is about the same as or slightly lower than the charging voltage of the first power supply unit 91).
  • the process is performed until timing t4.
  • the above-described precharge boosting operation is performed while the current value flowing through the first conductive path 21 is controlled to be constant.
  • the control unit 30 stops the above-described precharge boosting operation at the timing t4 when the voltage value of the first conductive path 21 becomes the second predetermined value. In this way, the contactor CT is switched from the off state (open state) to the on state (short state) at the timing of time t5 after the precharge boost operation is stopped.
  • a control device different from the control unit 30 may perform on / off control, or the control unit 30 may perform on / off control.
  • the control unit 30 switches the protective switching element T4 from the off state to the on state at time t6, and then switches to the voltage conversion unit 10 from the timing at time t7.
  • the step-down operation described above is performed. This step-down operation is performed until a predetermined end timing (for example, timing when the above-described start switch is switched from the on state to the off state).
  • the in-vehicle power supply device 1 of this configuration is charged when the control unit 30 gives the PWM signal (second control signal) to the charging circuit unit 50 in response to establishment of a predetermined precharge condition.
  • the circuit unit 50 operates so as to supply a charging current to the first conductive path 21 side. Therefore, when a predetermined precharge condition is satisfied, the capacitance component on the first conductive path 21 side (in the example of FIG. 1, the capacitance component CP, the capacitor C1, and the capacitor C2 connected to the wiring portion 81) is charged. Is possible.
  • the charging current can be controlled by the on / off operation of the protective switching element T3, a configuration capable of controlling the current during the precharging operation can be realized more easily.
  • the capacitance component CP may be a capacitance component present in a load connected to the wiring portion 81, or may be a large-capacity capacitor connected to the wiring portion 81.
  • the power supply device 1 includes a voltage detection unit 41 that detects the voltage value of the first conductive path 21. Then, the control unit 30 outputs the PWM signal (second control signal) to the protective switching element T3 of the charging circuit unit 50 according to the establishment of the precharge condition, and then the first conductivity detected by the voltage detection unit 41.
  • the voltage conversion unit 10 performs a boosting operation in which the voltage applied to the second conductive path 22 is boosted and applied to the first conductive path 21. It is supposed to be done.
  • the boosted charge can be performed after the step-down charging, and the charge voltage of the capacitive component is set to the first voltage.
  • the voltage can be increased to a voltage higher than the voltage of the two conductive paths 22.
  • control unit 30 applies a PWM signal (second output) to the protection switching element T 3 so that the value of the current flowing through the first conductive path 21 is set to a predetermined target current value in the precharge step-down operation.
  • Control duty This makes it possible to charge the capacitance component while controlling the current in the first conductive path 21 to a desired value during the precharge step-down operation. Note that the capacitance component can be charged while controlling the current of the first conductive path 21 to a desired value also for the boost precharge.
  • the charging circuit unit is configured as a synchronous rectification type DCDC converter, but a diode type DCDC converter may be used.
  • the current of the first conductive path 21 is controlled to be constant during the precharge operation.
  • the current of the first conductive path 21 may be controlled to be constant by a method different from that of the first embodiment.
  • the current detection unit 44 when the current detection unit 44 is provided between the connection part of the charging circuit unit 50 in the input side conductive path 22A and the output side terminal LV, the current flowing through the input side conductive path 22A (input current)
  • the charging circuit unit 50 can also be controlled while detecting. Specifically, as in the example shown in FIG.
  • the target current of the input current current flowing into the charging circuit unit 50 through the input side conductive path 22A
  • the average of the output current may be controlled to be constant.
  • the input side conductive path 22A side is a predetermined input voltage (for example, 12V)
  • the first conductive path 21 side is predetermined.
  • the input current Iin when the output current (for example, 1V) and the output current are stepped down at a predetermined current value (for example, 5A) is ⁇ , the efficiency is Vin, the input voltage is Vin, the output current is Iout, and the output voltage is In the case of Vout, it can be expressed as Iin ⁇ Vin ⁇ ⁇ Iout ⁇ Vout, which is Iin (Iout ⁇ Vout / Vin) / ⁇ . Therefore, the target value of the input current Iin may be determined so that a desired output current Iout can be obtained.
  • FIG. 3 an example is shown in which the voltage on the primary side (first conductive path 21 side) is increased in steps of 1V.
  • the input voltage (voltage of the input side conductive path 22A) and the output voltage (voltage of the first conductive path 21) during the precharge operation by the step-down operation of the charging circuit unit 50 are used. Based on the above, control may be performed so that the output current (current of the first conductive path 21) becomes a desired target current value.

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

Abstract

La présente invention obtient plus facilement une configuration capable de réaliser une opération de précharge sur un composant de capacité présent sur un côté d'une unité de conversion de tension et de commander le courant pendant l'opération de précharge. Dans ce dispositif d'alimentation électrique embarqué (1), une unité de circuit de charge (50) pour effectuer une seconde opération de conversion de tension est conçue de manière à réduire, conformément à l'opération MARCHE/ARRÊT d'un élément de commutation de protection (T3), la tension appliquée à un trajet de conduction côté entrée (22A) et à appliquer une tension de sortie à un trajet de conduction côté sortie (22B). Une unité de commande (30) délivre en sortie un second signal de commande, par lequel un signal MARCHE et un signal ARRÊT sont commutés en alternance, à l'élément de commutation de protection (T3) de l'unité de circuit de charge (50) conformément à l'établissement d'une condition de précharge prédéterminée.
PCT/JP2019/019067 2018-05-24 2019-05-14 Dispositif d'alimentation électrique à bord d'un véhicule WO2019225394A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021197380A1 (fr) * 2020-03-31 2021-10-07 Valeo Powertrain (shanghai) Co., Ltd. Circuit de protection contre les sous-tensions pour convertisseur cc/cc et procédé associé

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Publication number Priority date Publication date Assignee Title
JP2013099069A (ja) * 2011-10-31 2013-05-20 Sharp Corp Ｄｃ／ｄｃコンバータ、ソーラー充電システム、及び移動体
JP2015156777A (ja) * 2014-02-21 2015-08-27 三菱電機株式会社 スイッチング電源装置
JP2017085810A (ja) * 2015-10-29 2017-05-18 トヨタ自動車株式会社 車両用電源システム
JP2018057215A (ja) * 2016-09-30 2018-04-05 株式会社オートネットワーク技術研究所 車両用電源装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013099069A (ja) * 2011-10-31 2013-05-20 Sharp Corp Ｄｃ／ｄｃコンバータ、ソーラー充電システム、及び移動体
JP2015156777A (ja) * 2014-02-21 2015-08-27 三菱電機株式会社 スイッチング電源装置
JP2017085810A (ja) * 2015-10-29 2017-05-18 トヨタ自動車株式会社 車両用電源システム
JP2018057215A (ja) * 2016-09-30 2018-04-05 株式会社オートネットワーク技術研究所 車両用電源装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021197380A1 (fr) * 2020-03-31 2021-10-07 Valeo Powertrain (shanghai) Co., Ltd. Circuit de protection contre les sous-tensions pour convertisseur cc/cc et procédé associé

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