WO2017094681A1 - 給電制御装置 - Google Patents

給電制御装置 Download PDF

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Publication number
WO2017094681A1
WO2017094681A1 PCT/JP2016/085225 JP2016085225W WO2017094681A1 WO 2017094681 A1 WO2017094681 A1 WO 2017094681A1 JP 2016085225 W JP2016085225 W JP 2016085225W WO 2017094681 A1 WO2017094681 A1 WO 2017094681A1
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WO
WIPO (PCT)
Prior art keywords
voltage
input
circuit
semiconductor switch
level voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/085225
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
佑樹 杉沢
峻一 澤野
康太 小田
佳祐 眞瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Wiring Systems Ltd
AutoNetworks Technologies Ltd
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Wiring Systems Ltd, AutoNetworks Technologies Ltd, Sumitomo Electric Industries Ltd filed Critical Sumitomo Wiring Systems Ltd
Priority to US15/776,559 priority Critical patent/US10547194B2/en
Priority to EP16870618.2A priority patent/EP3386063B1/en
Priority to CN201680067675.5A priority patent/CN108292851B/zh
Publication of WO2017094681A1 publication Critical patent/WO2017094681A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007184—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage in response to battery voltage gradient
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply

Definitions

  • the present invention relates to a power feeding control device that controls power feeding through a current path by switching a switch provided in the current path to ON or OFF.
  • the vehicle is equipped with a power supply control device (for example, see Patent Document 1) that controls power supply from the battery to the load.
  • the power supply control device described in Patent Document 1 includes an N-channel FET (Field-Effect-Transistor) that functions as a semiconductor switch, and this FET is provided in a current path from the positive electrode of the battery to one end of the load. By switching the FET on or off, power feeding through the current path is controlled.
  • the positive electrode of the battery and one end of the load are connected to the drain and source of the FET, respectively, and the negative electrode of the battery and the other end of the load are grounded.
  • the power supply control device described in Patent Document 1 further includes a capacitor provided between the drain and gate of the FET, that is, a so-called charging circuit that charges an input capacitance.
  • the charging circuit charges the capacitor by supplying current from the gate side to the capacitor.
  • the gate voltage becomes equal to or higher than the predetermined voltage, and the FET is turned on.
  • the charging circuit outputs a voltage higher than the input voltage input from the battery to the drain of the FET to the gate of the FET to charge the capacitor.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a power supply control device capable of preventing sudden interruption of power supply through a current path due to a decrease in input voltage. It is in.
  • the power supply control device is provided in the current path, and is switched on when the voltage at the control end becomes equal to or higher than a predetermined voltage, and when the voltage at the control end becomes less than the predetermined voltage.
  • a power supply control device comprising a semiconductor switch that is switched off and controlling power feeding through the current path by switching the semiconductor switch on and off, a capacitor having one end connected to the control terminal, and charging the capacitor A charging circuit, a diode that prevents current from flowing from the capacitor to the charging circuit, an input voltage detecting unit that detects an input voltage that is input to an input terminal of the current in the semiconductor switch, and the semiconductor switch An input unit to which a switching signal instructing switching to ON or OFF is input, and a switching signal input to the input unit is used to turn on the semiconductor switch.
  • a drive unit that drives the charging circuit when the voltage detected by the input voltage detection unit is greater than or equal to an input voltage threshold when the replacement is instructed, and the driving unit drives the charging circuit During the operation, even if the voltage detected by the input voltage detection unit becomes less than the input voltage threshold, the driving of the charging circuit is maintained.
  • the input switching signal instructs to switch on the semiconductor switch provided in the current path
  • the input voltage input to the current input terminal of the semiconductor switch is input.
  • the charging circuit is driven.
  • the charging circuit charges a capacitor, for example, an input capacitor, whose one end is connected to the control end of the semiconductor switch via a diode. As a result, the voltage at the control end becomes equal to or higher than the predetermined voltage, and the semiconductor switch is turned on.
  • the power supply control device discharges the power stored in the capacitor, and a both-end voltage detection unit that detects a voltage between the input terminal of the semiconductor switch and an output terminal of a current in the semiconductor switch.
  • a discharge circuit and when the driving unit is driving the charging circuit, the voltage detected by the input voltage detection unit is less than the input voltage threshold value, and the both-end voltage detection unit detects When the voltage becomes equal to or higher than the voltage threshold across the both ends, the operation of the charging circuit is stopped and the discharging circuit is driven.
  • the input voltage input to the input terminal of the semiconductor switch is less than the input voltage threshold value, and the voltage between the input terminal and the output terminal of the semiconductor switch is
  • the voltage threshold is exceeded, the operation of the charging circuit is stopped, the discharging circuit is driven, and the semiconductor switch is turned off. Therefore, even when the input voltage is lowered, when the output terminal of the semiconductor switch is grounded, the voltage between the input terminal and the output terminal of the semiconductor switch is maintained at the voltage threshold value across the both ends. The switch is switched off. This prevents overcurrent from flowing through the semiconductor switch due to grounding of the output end of the semiconductor switch.
  • the power supply control device discharges the power stored in the capacitor, and a both-end voltage detection unit that detects a voltage between the input terminal of the semiconductor switch and an output terminal of a current in the semiconductor switch.
  • a discharge circuit and when the driving unit is driving the charging circuit, when the voltage detected by the both-end voltage detection unit is equal to or higher than a both-end voltage threshold value for a predetermined time or longer, the charging unit The operation of the circuit is stopped, and the discharge circuit is driven.
  • the charging circuit when the charging circuit is driven, when the voltage between the input terminal and the output terminal of the semiconductor switch is equal to or higher than the voltage threshold across both ends, in other words, the charging circuit is driven. Nevertheless, when the semiconductor switch is not switched on, the operation of the charging circuit is stopped, the discharge circuit is driven, and the semiconductor switch is switched off. When the semiconductor switch cannot be turned on due to a failure, power supply through the current path is stopped to prevent wasteful power consumption.
  • the power supply control device includes: an output circuit that outputs a voltage corresponding to a current flowing through the current path within a predetermined range; and the driving unit that stops the operation of the charging circuit and drives the discharging circuit. And an adjusting unit that adjusts a voltage at a voltage output terminal from which the output circuit outputs a voltage to a voltage outside the predetermined range.
  • the output circuit outputs a voltage corresponding to the current flowing through the current path within a predetermined range.
  • the voltage output from the output circuit is used, for example, to calculate the temperature of the electric wires that constitute the current path. Since the predetermined condition is satisfied when the charging circuit is driven, the voltage at the voltage output terminal of the output circuit is adjusted to a voltage outside the predetermined range when the semiconductor switch is turned off. As a result, it is notified that power cannot be normally supplied via the current path.
  • FIG. 1 is a block diagram illustrating a configuration of a main part of a power supply system in a first embodiment. It is a block diagram which shows the principal part structure of an electric power feeding control apparatus. It is a circuit diagram of a control circuit. It is a chart for demonstrating operation
  • 6 is a block diagram illustrating a main configuration of a power supply control device according to Embodiment 2. FIG. It is a circuit diagram of a control circuit. It is a chart for demonstrating operation
  • FIG. 1 is a block diagram illustrating a main configuration of a power supply system 1 according to the first embodiment.
  • the power supply system 1 is suitably mounted on a vehicle and includes a battery 10, a power supply control device 11, a load 12, and a starter 13.
  • the positive electrode of the battery 10 is connected to one end of the power supply control device 11 and the starter 13.
  • the other end of the power supply control device 11 is connected to one end of the load 12.
  • the negative electrode of the battery 10 and the other ends of the load 12 and the starter 13 are grounded.
  • the battery 10 supplies power to the load 12 via the power supply control device 11 and also supplies power to the starter 13.
  • the load 12 is an electric device mounted on the vehicle.
  • the load 12 operates when power is supplied from the battery 10 to the load 12, and the load 12 stops operating when power supply from the battery 10 to the load 12 is interrupted.
  • the starter 13 is a motor for operating an engine (not shown), and operates using electric power supplied from the battery 10.
  • the power supply control device 11 receives an operation signal for instructing the operation of the load 12 and a stop signal for instructing the operation of the load 12 to stop.
  • the power supply control device 11 controls power supply to the load 12 based on the input signal.
  • FIG. 2 is a block diagram showing a main configuration of the power supply control device 11.
  • the power supply control device 11 includes a semiconductor switch 20, an input voltage detection unit 21, a charging circuit 22, a discharging circuit 23, an output circuit 24, a control circuit 25, a microcomputer (hereinafter referred to as a microcomputer) 26, a capacitor Cs, and diodes D1 and D2.
  • a microcomputer hereinafter referred to as a microcomputer
  • the semiconductor switch 20 is an N channel type FET.
  • the capacitor Cs is an input capacitance that is formed as the semiconductor switch 20 is manufactured.
  • the drain of the semiconductor switch 20 is connected to the positive electrode of the battery 10, and the source of the semiconductor switch 20 is connected to one end of the load 12.
  • a capacitor Cs is connected between the drain and gate of the semiconductor switch 20.
  • the drain of the semiconductor switch 20 is further connected to an input voltage detection unit 21, a charging circuit 22 and an output circuit 24.
  • the input voltage detector 21, the charging circuit 22 and the output circuit 24 are grounded and connected to the control circuit 25 separately.
  • the output circuit 24 is also connected to the source of the semiconductor switch 20 and the microcomputer 26.
  • the gate of the semiconductor switch 20 is connected to the cathode of the diode D1 and the anode of the diode D2 in addition to the capacitor Cs.
  • the anode of the diode D1 is connected to the charging circuit 22.
  • the cathode of the diode D2 is connected to the discharge circuit 23.
  • the discharge circuit 23 is grounded and is also connected to the control circuit 25.
  • the control circuit 25 is further connected to the microcomputer 26.
  • a high level voltage or a low level voltage is input to the charging circuit 22 from the control circuit 25.
  • the charging circuit 22 outputs a voltage higher than the input voltage input from the battery 10 to the drain of the semiconductor switch 20 to the capacitor Cs via the diode D1. .
  • a current is supplied from the gate side of the semiconductor switch 20 to the capacitor Cs, and the capacitor Cs is charged.
  • the diode D1 prevents current from flowing from the capacitor Cs to the charging circuit 22.
  • the semiconductor switch 20 When the gate voltage of the semiconductor switch 20 with respect to the source potential of the semiconductor switch 20 becomes equal to or higher than a predetermined voltage, the semiconductor switch 20 is turned on, and a current flows between the drain and source of the semiconductor switch 20. It becomes possible. When the semiconductor switch 20 is on, the resistance value between the drain and the source of the semiconductor switch 20 is small.
  • the semiconductor switch 20 When the semiconductor switch 20 is on, current is input from the battery 10 to the drain of the semiconductor switch 20 and output from the source of the semiconductor switch 20 to the load 12. By supplying this current, power is supplied to the load 12.
  • the power supply control device 11 is provided with a current path from the battery 10 to the load 12, and the semiconductor switch 20 is provided in this current path.
  • the drain, source, and gate of the semiconductor switch 20 function as an input terminal, an output terminal, and a control terminal, respectively.
  • the charging circuit 22 When the semiconductor switch 20 is on, the drain and source voltages of the semiconductor switch 20 with respect to the ground potential are substantially the same.
  • the charging circuit 22 generates a constant voltage lower than the input voltage from the input voltage input from the battery 10 to the drain of the semiconductor switch 20, and uses the generated constant voltage to generate a voltage higher than the input voltage. Generate.
  • the charging circuit 22 stops its operation when a low level voltage is input from the control circuit 25.
  • a high level voltage or a low level voltage is also input to the discharge circuit 23 from the control circuit 25.
  • the discharge circuit 23 releases the electric power stored in the capacitor Cs.
  • the cathode of the diode D2 is grounded via a resistor (not shown) in the discharge circuit 23, and current flows from the capacitor Cs to the ground potential via the diode D2 and the resistor in the discharge circuit 23.
  • the voltage across the capacitor Cs that is, the source voltage of the semiconductor switch 20 with respect to the potential of the gate of the semiconductor switch 20 is lowered.
  • the semiconductor switch 20 when the gate voltage with respect to the source potential becomes less than a predetermined voltage, the semiconductor switch 20 is switched off, and no current flows between the drain and source of the semiconductor switch 20. At this time, the semiconductor switch 20 is off, and power supply from the battery 10 to the load 12 is interrupted.
  • the discharge circuit 23 stops its operation when a low level voltage is input from the control circuit 25. At this time, in the discharge circuit 23, the cathode of the diode D2 is open.
  • the power supply control device 11 controls power supply to the load 12 via the current path by switching the semiconductor switch 20 on and off.
  • the input voltage detector 21 detects an input voltage input from the battery 10 to the drain of the semiconductor switch 20.
  • the input voltage detector 21 outputs a high level voltage to the control circuit 25 when the detected input voltage is equal to or higher than a preset input voltage threshold.
  • the input voltage detector 21 outputs a low level voltage to the control circuit 25 when the detected input voltage is less than the input voltage threshold. While the starter 13 is operating, the input voltage drops to a voltage below the input voltage threshold. For this reason, the input voltage detector 21 outputs a low level voltage while the starter 13 is operating.
  • the output circuit 24 outputs a voltage proportional to the magnitude of the current flowing in the current path from the battery 10 to the load 12.
  • a control circuit 25 and a microcomputer 26 are connected to a voltage output terminal from which the output circuit 24 outputs a voltage.
  • the output circuit 24 supplies a voltage proportional to the magnitude of the current flowing in the current path to the control circuit 25 and the microcomputer 26. Output.
  • the voltage that the output circuit 24 outputs from the voltage output terminal to the control circuit 25 and the microcomputer 26 is represented by (the magnitude of the current flowing through the current path) ⁇ (predetermined number). Therefore, the voltage output from the output circuit 24 to the control circuit 25 and the microcomputer 26 is higher as the current flowing through the current path is larger.
  • the output circuit 24 generates a voltage to be output to the control circuit 25 and the microcomputer 26 from the input voltage from the battery 10 to the drain of the semiconductor switch 20.
  • the voltage output from the output circuit 24 to the control circuit 25 and the microcomputer 26 is a voltage within a predetermined range. In other words, an upper limit voltage is provided for the voltage output from the output circuit 24, and the output circuit 24 outputs a voltage equal to or lower than the upper limit voltage to the control circuit 25 and the microcomputer 26.
  • the microcomputer 26 receives an operation signal and a stop signal, and receives a voltage from the output circuit 24 and the control circuit 25.
  • the microcomputer 26 outputs a switching signal for instructing switching of the semiconductor switch 20 to ON or OFF based on the input signal and the voltage output from the output circuit 24.
  • the switching signal is composed of a high level voltage and a low level voltage. The high level voltage of the switching signal instructs the semiconductor switch 20 to be turned on, and the low level voltage of the switching signal instructs the semiconductor switch 20 to be turned off.
  • the microcomputer 26 calculates the wire temperature of a wire (not shown) that constitutes the current path from the battery 10 to the load 12 based on the voltage input from the output circuit 24.
  • a semiconductor switch 20 is provided in the middle of the electric wire.
  • the microcomputer 26 changes the voltage of the switching signal to the high level voltage when the calculated wire temperature is lower than the predetermined temperature and the operation signal is input.
  • the microcomputer 26 changes the voltage of the switching signal to a low level voltage when the calculated wire temperature is equal to or higher than the predetermined temperature or when a stop signal is input.
  • control circuit 25 Based on the voltage input from the input voltage detection unit 21, the voltage input from the output circuit 24, and the switching signal input from the microcomputer 26, the control circuit 25 sets the charge circuit 22 and the discharge circuit 23 to high. A level voltage or a low level voltage is output.
  • FIG. 3 is a circuit diagram of the control circuit 25.
  • the control circuit 25 includes an OR circuit 30, AND circuits 31 and 32, inverters 33 and 34, a latch unit 35, and a comparator 36.
  • Each of the OR circuit 30 and the AND circuits 31 and 32 has two input terminals and one output terminal.
  • the comparator 36 has a plus terminal, a minus terminal, and an output terminal.
  • One input terminal of the OR circuit 30 is connected to the input voltage detector 21.
  • Each of the output terminals of the microcomputer 26 and the OR circuit 30 is connected to two input terminals of the AND circuit 31.
  • the output terminal of the AND circuit 31 is connected to the other input terminal of the OR circuit 30 and one input terminal of the AND circuit 32.
  • the other input terminal of the AND circuit 32 is connected to the output terminal of the inverter 33.
  • An input terminal of the inverter 33 is connected to the latch unit 35.
  • the latch unit 35 is further connected to the output terminal of the comparator 36.
  • the plus terminal of the comparator 36 is connected to the voltage output terminal of the output circuit 24.
  • a reference voltage Vr is input to the negative terminal of the comparator 36.
  • the reference voltage Vr is a constant value.
  • the output terminal of the AND circuit 32 is connected to the charging circuit 22 and the input terminal of the inverter 34.
  • the output terminal of the inverter 34 is connected to the discharge circuit 23.
  • a high level voltage or a low level voltage is input to the input terminals of the OR circuit 30, the AND circuits 31, 32, and the inverters 33, 34.
  • a high level voltage or a low level voltage is output from the output terminals of the OR circuit 30, the AND circuits 31 and 32, the inverters 33 and 34, and the comparator 36.
  • the OR circuit 30 outputs a high level voltage from the output terminal when a high level voltage is input to one of the two input terminals, and a low level voltage is input to both of the two input terminals.
  • the low level voltage is output from the output terminal.
  • Each of the AND circuits 31 and 32 outputs a high level voltage from the output terminal when a high level voltage is input to both of the two input terminals, and the low level voltage is input to one of the two input terminals.
  • Each of the inverters 33 and 34 outputs a high level voltage from the output terminal when a low level voltage is input to the input terminal, and outputs a low level voltage from the output terminal when a high level voltage is input to the input terminal. Is output.
  • the comparator 36 outputs a low level voltage from the output terminal when the voltage input to the plus terminal from the output circuit 24 is less than the reference voltage Vr input to the minus terminal.
  • the comparator 36 outputs a high level voltage from the output terminal when the voltage input to the plus terminal from the output circuit 24 is equal to or higher than the reference voltage Vr input to the minus terminal.
  • the low level voltage or the high level voltage is input to the latch unit 35 from the comparator 36.
  • the latch unit 35 outputs the low level voltage to the input terminal of the inverter 33 while the comparator 36 outputs the low level voltage.
  • the latch unit 35 outputs the high level voltage to the input terminal of the inverter 33. Thereafter, the latch unit 35 continues to output the high level voltage to the input terminal of the inverter 33 regardless of the voltage input from the comparator 36.
  • a high level voltage or a low level voltage is input from the input voltage detection unit 21 and the AND circuit 31 to each of the two input terminals of the OR circuit 30.
  • a switching signal composed of a high level voltage and a low level voltage is input from the microcomputer 26 to one input terminal of the AND circuit 31.
  • the control circuit 25 functions as an input unit.
  • a high level voltage or a low level voltage is input from the OR circuit 30 to the other input terminal of the AND circuit 31.
  • a high level voltage or a low level voltage is input to the two input terminals of the AND circuit 32 from the AND circuit 31 and the inverter 33.
  • a high level voltage or a low level voltage is input from the AND circuit 32 to the charging circuit 22 and the input terminal of the inverter 34.
  • a high level voltage or a low level voltage is input to the discharge circuit 23 from the inverter 34.
  • FIG. 4 is a chart for explaining the operation of the control circuit 25. 4 shows the voltage indicated by the switching signal output from the microcomputer 26, the voltage output from the input voltage detector 21 and the comparator 36, and the output voltage output from the AND circuit 31. Further, FIG. 4 shows voltages input to the charging circuit 22 and the discharging circuit 23. In FIG. 4, the high level voltage is indicated by “H” and the low level voltage is indicated by “L”. In the following description of the operation of the control circuit 25, it is assumed that the latch unit 35 outputs a low level voltage.
  • each of the high level voltage and the low level voltage of the switching signal output from the microcomputer 26 instructs the semiconductor switch 20 to be switched on and off.
  • the fact that the input voltage detector 21 outputs a high level voltage indicates that the input voltage is equal to or higher than the input voltage threshold, and that the input voltage detector 21 outputs a low level voltage indicates that the input voltage is Indicates that it is less than the input voltage threshold.
  • the fact that the comparator 36 outputs a low level voltage indicates that the voltage output by the output circuit 24 is less than the reference voltage Vr, that is, the current flowing in the current path is less than the predetermined current.
  • the fact that the comparator 36 outputs a high level voltage indicates that the voltage output from the output circuit 24 is equal to or higher than the reference voltage Vr, that is, the current flowing through the current path is equal to or higher than a predetermined current.
  • the AND circuits 31 and 32 When the switching signal indicates a low level voltage, the AND circuits 31 and 32 output a low level voltage regardless of the voltage output from the input voltage detector 21 and the comparator 36 and the output voltage of the AND circuit 31, The inverter 34 outputs a high level voltage. Therefore, a low level voltage and a high level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively. In this case, the charging circuit 22 stops operating, and the discharging circuit 23 releases the electric power stored in the capacitor Cs. Thereby, the semiconductor switch 20 is switched off.
  • the comparator 36 Even when the switching signal indicates a high level voltage, when the comparator 36 outputs a high level voltage, the AND voltage is output regardless of the voltage output by the input voltage detection unit 21 and the output voltage of the AND circuit 31.
  • the circuit 32 and the inverter 34 output a low level voltage and a high level voltage, respectively.
  • the comparator 36 When the comparator 36 outputs a high level voltage, the voltage output from the latch unit 35 to the inverter 33 is switched from the low level voltage to the high level. Thereafter, the latch unit 35 continues to output the high level voltage to the inverter 33 regardless of the voltage output from the comparator 36.
  • the semiconductor switch 20 is switched off. In this way, when the comparator 36 outputs a high level voltage, the semiconductor switch 20 is switched off, so that a current greater than a predetermined current does not flow in the current path, and an overcurrent is prevented from flowing in the current path.
  • the switching signal indicates a high level voltage
  • the AND circuit 31 is independent of the output voltage of the AND circuit 31.
  • 32 output a high level voltage
  • the inverter 34 outputs a low level voltage. Therefore, a high level voltage and a low level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively.
  • the charging circuit 22 charges the capacitor Cs, and the discharging circuit 23 stops operating. Thereby, the semiconductor switch 20 is turned on.
  • the control circuit 25 also functions as a drive unit.
  • the AND circuit 31 When the switching signal indicates a high level voltage and each of the input voltage detector 21 and the comparator 36 outputs a low level voltage, the AND circuit 31 outputs a low level voltage, that is, a semiconductor switch When 20 is off, the OR circuit 30 outputs a low level voltage. As a result, the AND circuits 31 and 32 both output a low level voltage, and the inverter 34 outputs a high level voltage. As a result, a low level voltage and a high level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively, and the semiconductor switch 20 is kept off.
  • FIG. 5 is a timing chart for explaining the operation of the power supply control device 11.
  • the current flowing in the current path is less than a predetermined current, and the comparator 36 and the latch unit 35 output a low level voltage.
  • the voltage at the source of the semiconductor switch 20 is referred to as a source voltage.
  • transitions of the voltage, input voltage, and source voltage indicated by the switching signal are indicated by bold lines, and transitions of the input voltage threshold Vith are indicated by thin lines.
  • the high level voltage is indicated by “H” and the low level voltage is indicated by “L”.
  • the control circuit 25 When the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage, when the input voltage is equal to or higher than the input voltage threshold Vith, that is, when the input voltage detection unit 21 outputs the high level voltage, The control circuit 25 outputs a high level voltage and a low level voltage to the charging circuit 22 and the discharging circuit 23, respectively. As a result, the charging circuit 22 starts charging the capacitor Cs while the cathode of the diode D2 is opened in the discharging circuit 23. As the voltage across the capacitor Cs increases, the resistance value between the drain and source of the semiconductor switch 20 decreases, and the source voltage increases to the input voltage. In the semiconductor switch 20, when the gate voltage with respect to the source potential becomes a predetermined voltage or more, the semiconductor switch 20 is turned on, and the source voltage substantially coincides with the input voltage.
  • the input voltage drops to a voltage lower than the input voltage threshold Vith, and the input voltage detector 21 outputs a low level voltage.
  • the AND circuit 31 outputs a high level voltage and the control circuit 25 drives the charging circuit 22, the voltage output from the input voltage detection unit 21 is changed from the high level voltage to the low level. Even when the voltage is switched, the AND circuit 31 continues to output a high level voltage. For this reason, the control circuit 25 maintains the drive of the charging circuit 22 while the starter 13 is operating.
  • the semiconductor switch 20 is not switched off due to a decrease in the input voltage, and sudden interruption of the power supply to the load 12 via the current path is prevented.
  • the charging circuit 22 generates a constant voltage from the input voltage, and generates a voltage higher than the input voltage using the generated constant voltage.
  • the input voltage decreases to a voltage lower than the input voltage threshold, a constant voltage is not generated from the input voltage, and the voltage output from the charging circuit 22 to the capacitor may decrease.
  • the input voltage returns to a voltage equal to or higher than the input voltage threshold while the semiconductor switch 20 remains on, and the source voltage also rises.
  • FIG. 6 is a timing chart for explaining another operation of the power supply control device 11. Also here, it is assumed that the comparator 36 and the latch unit 35 output a low level voltage. Also in FIG. 6, transitions of the voltage, input voltage, and source voltage indicated by the switching signal are indicated by bold lines, and transitions of the input voltage threshold Vith are indicated by thin lines. Similarly to FIG. 5, the high level voltage is indicated by “H” and the low level voltage is indicated by “L”. When the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage when the starter 13 is operated and the input voltage is less than the input voltage threshold Vith, the output voltage of the AND circuit 31 is the low level voltage. .
  • control circuit 25 maintains the voltage output to the charging circuit 22 and the discharging circuit 23 at the low level voltage and the high level voltage, respectively.
  • the capacitor Cs is not charged and the semiconductor switch 20 is kept off.
  • the source voltage is also maintained at zero V.
  • the starter 13 stops operating and the input voltage becomes equal to or higher than the input voltage threshold Vith, the voltage output from the input voltage detection unit 21 is switched from the low level voltage to the high level voltage, so that the control circuit 25 charges.
  • a high level voltage and a low level voltage are output to the circuit 22 and the discharge circuit 23, respectively.
  • the charging circuit 22 starts charging the capacitor Cs, the source voltage rises to the input voltage, and the semiconductor switch 20 is switched on.
  • FIG. 7 is a block diagram illustrating a main configuration of the power supply control device 11 according to the second embodiment.
  • the configuration of the power supply control device 11 is different.
  • the differences between the second embodiment and the first embodiment will be described. Since the configuration other than the configuration described later is the same as that in the first embodiment, the same reference numerals as those in the first embodiment are given to the components common to the first embodiment, and the description thereof is omitted. To do.
  • the power supply control device 11 includes a semiconductor switch 20, an input voltage detection unit 21, a charging circuit 22, a discharging circuit 23, an output circuit 24, a control circuit 25, a microcomputer 26, and a capacitor Cs. And diodes D1 and D2. These are connected in the same manner as in the first embodiment. Similarly to the first embodiment, the drain and source of the semiconductor switch 20 are also connected to the positive electrode of the battery 10 and one end of the load 12.
  • the power supply control device 11 further includes a both-end voltage detection unit 27.
  • the both-end voltage detection unit 27 is connected to the drain and source of the semiconductor switch 20 and the control circuit 25 separately.
  • the input voltage detector 21, the charging circuit 22, the discharge circuit 23, the output circuit 24, and the both-end voltage detector 27 are further grounded.
  • the both-end voltage detection unit 27 detects a voltage between the drain and the source of the semiconductor switch 20 (hereinafter referred to as a both-end voltage).
  • the both-end voltage detection unit 27 outputs a high-level voltage to the control circuit 25 when the detected both-end voltage is equal to or higher than a preset both-end voltage threshold.
  • the both-end voltage detection unit 27 outputs a low level voltage to the control circuit 25 when the detected both-end voltage is less than the both-end voltage threshold.
  • the drain and source voltages of the semiconductor switch 20 with respect to the ground potential are substantially the same.
  • the both-ends voltage is substantially zero V, and is less than a both-ends voltage threshold value.
  • the drain voltage of the semiconductor switch 20 is an input voltage input from the battery 10 to the drain, and the source voltage of the semiconductor switch 20 is zero V.
  • the both-end voltage substantially coincides with the input voltage and is equal to or higher than the both-end voltage threshold.
  • FIG. 8 is a circuit diagram of the control circuit 25.
  • the control circuit 25 according to the second embodiment includes an OR circuit 30, AND circuits 31, 32, inverters 33, 34, a latch unit 35, and a comparator 36.
  • the input voltage detection unit 21, the charging circuit 22, the discharging circuit 23, the microcomputer 26, the OR circuit 30, the AND circuits 31, 32, the inverters 33 and 34, and the latch unit 35 are connected in the same manner as in the first embodiment.
  • the plus terminal of the comparator 36 is connected to the voltage output terminal of the output circuit 24, and the reference voltage Vr is input to the minus terminal of the comparator 36.
  • the control circuit 25 in the second embodiment further includes an inverter 37, AND circuits 38 and 39, an OR circuit 40, a filter unit 41, a switch 42, and a resistor R1.
  • Each of the AND circuit 38 and the OR circuit 40 has three input terminals and one output terminal.
  • the AND circuit 39 has two input terminals and one output terminal.
  • the input terminal of the inverter 37 is connected to the input voltage detector 21.
  • the both-end voltage detector 27, the output terminal of the AND circuit 31, and the output terminal of the inverter 37 are connected to three input terminals of the AND circuit 38.
  • the both-end voltage detector 27 and the output terminal of the AND circuit 31 are connected to two input terminals of the AND circuit 39.
  • An output terminal of the AND circuit 39 is connected to the filter unit 41.
  • the output terminal of the comparator 36, the output terminal of the AND circuit 38, and the filter unit 41 are connected to three input terminals of the OR circuit 40.
  • the output terminal of the OR circuit 40 is connected to the latch unit 35.
  • a second constant voltage Va is applied to one end of the switch 42.
  • the other end of the switch 42 is connected to one end of the resistor R1, and the other end of the resistor R1 is grounded.
  • One end of the resistor R ⁇ b> 1 is further connected to the voltage output end of the output circuit 24.
  • a high level voltage or a low level voltage is input to the input terminals of the OR circuits 30, 40, the AND circuits 31, 32, 38, 39 and the inverters 33, 34, 37.
  • a high level voltage or a low level voltage is output from the output terminals of the OR circuits 30, 40, the AND circuits 31, 32, 38, 39, the inverters 33, 34, 37, and the comparator 36.
  • the AND circuit 38 outputs a high level voltage from the output terminal when a high level voltage is input to all three input terminals, and a low level voltage is input to at least one of the three input terminals. The low level voltage is output from the output terminal.
  • the inverter 37 operates in the same manner as the inverters 33 and 34.
  • the AND circuit 39 operates in the same manner as the AND circuits 31 and 32.
  • the OR circuit 40 outputs a high level voltage from the output terminal when a high level voltage is input to at least one of the three input terminals, and a low level voltage is input to all three input terminals. The low level voltage is output from the output terminal.
  • a high level voltage or a low level voltage is input from the input voltage detection unit 21 and the AND circuit 31 to each of the two input terminals of the OR circuit 30.
  • a switching signal is input from the microcomputer 26 to one input terminal of the AND circuit 31, and a high level voltage or a low level voltage is input from the OR circuit 30 to the other input terminal of the AND circuit 31.
  • a high level voltage or a low level voltage is input from the input voltage detector 21 to the input terminal of the inverter 37.
  • a high level voltage or a low level voltage is input to each of the three input terminals of the AND circuit 38 from the both-end voltage detector 27, the AND circuit 31, and the inverter 37.
  • a high level voltage or a low level voltage is input to the two input terminals of the AND circuit 39 from the both-end voltage detection unit 27 and the AND circuit 31.
  • a high level voltage or a low level voltage is input to the two input terminals of the OR circuit 40 from the comparator 36 and the AND circuit 38, respectively.
  • a high level voltage or a low level voltage is input from the AND circuit 39 to the filter unit 41.
  • the filter unit 41 outputs the high level voltage to the remaining one input terminal of the OR circuit 40, and the AND circuit 39 continues for a predetermined time.
  • the high level voltage is not output, the low level voltage is output to the remaining one input terminal of the OR circuit 40.
  • the filter unit 41 periodically detects the voltage output from the AND circuit 39.
  • the filter unit 41 outputs the high level voltage to the input terminal of the OR circuit 40 when the high level voltage is continuously detected a predetermined number of times, and when the high level voltage is not continuously detected the predetermined number of times, The low level voltage is output to the input terminal of the OR circuit 40.
  • a low level voltage or a high level voltage is input from the OR circuit 40 to the latch unit 35.
  • the latch unit 35 outputs the low level voltage to the input terminal of the inverter 33 while outputting the low level voltage from the OR circuit 40.
  • the latch unit 35 outputs the high level voltage to the input terminal of the inverter 33. Thereafter, the latch unit 35 continues to output the high level voltage to the input terminal of the inverter 33 regardless of the voltage input from the OR circuit 40.
  • a high level voltage or a low level voltage is input to the two input terminals of the AND circuit 32 from the AND circuit 31 and the inverter 33, respectively.
  • a high level voltage or a low level voltage is input from the AND circuit 32 to the charging circuit 22 and the input terminal of the inverter 34.
  • a high level voltage or a low level voltage is input to the discharge circuit 23 from the inverter 34.
  • the switch 42 is off while the latch unit 35 outputs a low level voltage.
  • a voltage within a predetermined range output from the output circuit 24 is input to the microcomputer 26 and the negative terminal of the comparator 36.
  • the switch 42 is turned on when the latch unit 35 outputs a high level voltage.
  • the second constant voltage Va exceeds the upper limit voltage of the voltage output from the output circuit 24. Therefore, when the switch 42 is on, the second constant voltage Va, which is a voltage outside the predetermined range described above, is input to the microcomputer 26 and the plus terminal of the comparator 36. Since the second constant voltage Va exceeds the reference voltage Vr, when the switch 42 is on, the comparator 36 outputs a high level voltage.
  • FIG. 9 is a chart for explaining the operation of the control circuit 25.
  • FIG. 9 shows the voltage indicated by the switching signal output from the microcomputer 26, the voltage output from the input voltage detection unit 21, the comparator 36, the both-end voltage detection unit 27 and the filter unit 41, and the output voltage of the AND circuit 31. Has been. Further, FIG. 9 shows voltages input to the latch unit 35, the charging circuit 22, and the discharging circuit 23. Also in FIG. 9, the high level voltage is indicated by “H” and the low level voltage is indicated by “L”. In the following description of the operation of the control circuit 25, it is assumed that the latch unit 35 outputs a low level voltage.
  • the AND circuit 31 is independent of the voltages output from the input voltage detection unit 21, the comparator 36, the both-end voltage detection unit 27, and the filter unit 41, and the output voltage of the AND circuit 31.
  • 32 output a low level voltage
  • the inverter 34 outputs a high level voltage.
  • the voltage input to the latch unit 35 depends on the voltage output from the input voltage detection unit 21, the both-end voltage detection unit 27, the comparator 36 and the filter unit 41, and the output voltage of the AND circuit 31.
  • the OR circuit 40 outputs a high level voltage, and the voltage input to the latch unit 35 is switched to the high level voltage. Accordingly, since the latch unit 35 outputs a high level voltage, the AND circuit 32 outputs a low level voltage, and the inverter 34 outputs a high level voltage. For this reason, the low level voltage and the high level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively, and the semiconductor switch 20 is switched off. After the voltage output from the OR circuit 40 is switched to the high level voltage, the latch unit 35 continues to output the high level voltage regardless of the voltage input from the OR circuit 40. Therefore, the semiconductor switch 20 is turned off. Maintained.
  • the microcomputer 26 receives the second constant voltage Va and notifies the microcomputer 26 of the abnormality.
  • the microcomputer 26 stops the calculation of the wire temperature and notifies the user of an abnormality by lighting a lamp (not shown) or displaying a message on a display unit (not shown). To do.
  • the comparator 36 and the filter unit 41 When the voltage indicated by the switching signal, the voltage output from the input voltage detection unit 21, and the voltage output from the both-end voltage detection unit 27 are high level voltages, the comparator 36 and the filter unit 41 output low level voltages. In this case, regardless of the output voltage of the AND circuit 31, the AND circuit 32 outputs a high level voltage and the inverter 34 outputs a low level voltage. Therefore, a high level voltage and a low level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively, and the semiconductor switch 20 is switched on. Since each of the input voltage detection unit 21 and the filter unit 41 outputs a high level voltage and a low level voltage, the voltage input to the latch unit 35 is a low level voltage, and the latch unit 35 outputs a low level voltage. to continue.
  • the latch unit 35 After the voltage output from the OR circuit 40 is switched to the high level voltage, the latch unit 35 continues to output the high level voltage regardless of the voltage input from the OR circuit 40. Therefore, the semiconductor switch 20 is turned off. Maintained. As described above, when the latch unit 35 outputs a high level voltage, the switch 42 is turned on, the second constant voltage Va is input to the microcomputer 26, and an abnormality is notified to the microcomputer 26.
  • the AND circuit 31 When the voltage indicated by the switching signal and the voltage output from the input voltage detection unit 21 are high level voltages and the voltages output from the both-end voltage detection unit 27 and the comparator 36 are low level voltages, the AND circuit 31 Regardless of the output voltage, the filter unit 41 outputs a low level voltage, and the latch unit 35 receives the low level voltage. Since each of the AND circuit 31 and the latch unit 35 outputs a high level voltage and a low level voltage, each of the AND circuit 32 and the inverter 34 outputs a high level voltage and a low level voltage. Therefore, a high level voltage and a low level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively, and the semiconductor switch 20 is turned on.
  • the state shown here is a state where the input voltage is less than the input voltage threshold and the voltage across the semiconductor switch 20 is greater than or equal to the voltage threshold across the semiconductor switch 20 even though the semiconductor switch 20 is on.
  • the output circuit 24 generates a voltage to be output to the control circuit 25 and the microcomputer 26 from the input voltage. For this reason, the output circuit 24 cannot generate a voltage exceeding the input voltage. Therefore, when the input voltage is less than the input voltage threshold, there is a possibility that the output circuit 24 outputs a voltage less than the reference voltage Vr even though a current greater than or equal to a predetermined current flows in the current path.
  • the source of the semiconductor switch 20 may be grounded. Switch off.
  • the switch 42 is turned on, the second constant voltage Va is input to the microcomputer 26, and an abnormality is notified to the microcomputer 26.
  • the filter unit 41 When the both-end voltage detection unit 27 and the comparator 36 output a low level voltage, the filter unit 41 outputs a low level voltage, and the latch unit 35 receives the low level voltage. Accordingly, when the both-end voltage detection unit 27 and the comparator 36 output a low level voltage, the latch unit 35 continues to output the low level voltage unless the voltage is switched to the high level voltage.
  • the output voltage of the AND circuit 31 is a high level voltage, and the both-end voltage
  • the AND circuit 32 and the inverter 34 output a high level voltage and a low level voltage.
  • the AND circuit 31 When the switching signal indicates a high level voltage and each of the input voltage detector 21 and the comparator 36 outputs a low level voltage, the AND circuit 31 outputs a low level voltage, that is, a semiconductor switch When 20 is off, the OR circuit 30 outputs a low level voltage. As a result, the AND circuits 31 and 32 both output a low level voltage, and the inverter 34 outputs a high level voltage. As a result, a low level voltage and a high level voltage are input to the charging circuit 22 and the discharging circuit 23, respectively, and the semiconductor switch 20 is kept off.
  • the starter 13 operates in a state where the semiconductor switch 20 is on and the input voltage becomes less than the input voltage threshold. Even if the voltage drops, the semiconductor switch 20 is kept on. In other words, even when the state is changed from the fifth state from the top in FIG. 9 to the seventh state from the top in FIG. 9 by the operation of the starter 13, the semiconductor switch 20 is kept on. Further, when the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage in a state where the input voltage is less than the input voltage threshold, the output voltage of the AND circuit 31 is the low level voltage. Is kept off without switching from off to on.
  • FIG. 10 is a timing chart for explaining the operation of the power supply control device 11.
  • the comparator 36 and the latch unit 35 output a low level voltage, and the battery 10 is deteriorated.
  • the resistance value of the internal resistance of the battery 10 increases, and the width of the voltage drop at the internal resistance is large.
  • the starter 13 does not operate.
  • transitions of the switching signal, the input voltage, the source voltage, the voltage output by the both-end voltage detection unit 27, and the voltage output by the latch unit 35 are indicated by bold lines.
  • the transitions of the input voltage threshold Vith and the source voltage threshold Vsth are indicated by thin lines.
  • the source voltage threshold Vsth is a threshold for determining whether or not the both-end voltage is equal to or higher than the both-end voltage threshold. When the source voltage exceeds the source voltage threshold Vsth, the both-ends voltage is less than the both-ends voltage threshold, and when the source voltage is less than or equal to the source voltage threshold Vsth, the both-ends voltage is greater than or equal to the both-ends voltage threshold.
  • the source voltage threshold Vsth is lower than the input voltage by a preset reference voltage, for example, 1V. In FIG. 10, as in FIG. 9, the high level voltage is indicated by “H” and the low level voltage is indicated by “L”.
  • the semiconductor switch 20 When the switching signal indicates a low level voltage, the semiconductor switch 20 is off. Since the starter 13 is not operating, the input voltage is equal to or higher than the input voltage threshold Vith, and the source voltage is zero V. For this reason, the source voltage is equal to or lower than the source voltage threshold Vsth, and the both-end voltage detection unit 27 outputs a high level voltage.
  • the both-end voltage detection unit 27 When the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage, the both-end voltage detection unit 27 outputs the high level voltage, but the input voltage detection unit 21 outputs the high level voltage, In addition, the time during which the high level voltage is continuously input to the filter unit 41 is less than the predetermined time. For this reason, in order to switch on the semiconductor switch 20, the charging circuit 22 starts charging the capacitor Cs while the discharge circuit 23 stops operating.
  • the resistance value between the drain and source of the semiconductor switch 20 decreases and current flows from the battery 10 to the load 12 via the semiconductor switch 20.
  • the source voltage increases.
  • the width of the voltage drop in the internal resistance of the battery 10 increases and the input voltage also decreases.
  • the resistance value of the internal resistance is large, the input voltage is greatly reduced.
  • the source voltage is less than the source voltage threshold Vsth when the input voltage becomes less than the input voltage threshold Vith, and the both-end voltage detector 27 outputs a high level voltage. Yes.
  • the latch unit 35 outputs a high level voltage.
  • the charging circuit 22 stops its operation, and the discharging circuit 23 releases the electric power stored in the capacitor Cs, so that the semiconductor switch 20 is switched off.
  • the resistance value between the drain and source of the semiconductor switch 20 increases, and the current flowing from the battery 10 to the load 12 decreases.
  • the input voltage increases and the source voltage decreases.
  • the semiconductor switch 20 is switched off, the input voltage returns to a voltage equal to or higher than the input voltage threshold Vith. However, since the latch unit 35 continues to output the high level voltage, the semiconductor switch 20 is kept off. .
  • the voltage output by the filter unit 41 when the predetermined time has elapsed after the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage is also switched from the low level voltage to the high level voltage. Further, not only when the internal resistance of the battery 10 is increased, but also when the resistance value of the electric wire between the positive electrode of the battery 10 and the drain of the semiconductor switch 20 is increased, when the source of the semiconductor switch 20 is grounded, The input voltage and the source voltage change similarly, and the semiconductor switch 20 is switched off.
  • the predetermined time related to the operation of the filter unit 41 is the time from when the charging circuit 22 starts to charge until the source voltage reaches the source voltage threshold Vsth in a state where the source of the semiconductor switch 20 is not grounded.
  • FIG. 11 is a timing chart for explaining another operation of the power supply control device 11. In the following description of the operation of the power supply control device 11, it is assumed that the comparator 36 and the latch unit 35 output a low level voltage, and the starter 13 does not operate.
  • transitions of the switching signal, the input voltage, the source voltage, the voltage output from the both-end voltage detection unit 27, and the voltage output from the latch unit 35 are indicated by bold lines. ing. The transitions of the input voltage threshold Vith and the source voltage threshold Vsth are indicated by thin lines. Further, as in FIG. 10, the high level voltage is indicated by “H”, and the low level voltage is indicated by “L”.
  • the semiconductor switch 20 When the switching signal indicates a low level voltage, the semiconductor switch 20 is off. Since the starter 13 is not operating, the input voltage is equal to or higher than the input voltage threshold Vith, and the source voltage is zero V. For this reason, the source voltage is equal to or lower than the source voltage threshold Vsth, and the both-end voltage detection unit 27 outputs a high level voltage. It is assumed that the latch unit 35 outputs a low level voltage.
  • the both-end voltage detection unit 27 When the voltage indicated by the switching signal is switched from the low level voltage to the high level voltage, the both-end voltage detection unit 27 outputs the high level voltage, but the input voltage detection unit 21 outputs the high level voltage, In addition, the time during which the high level voltage is continuously input to the filter unit 41 is less than the predetermined time. For this reason, in order to switch on the semiconductor switch 20, the charging circuit 22 starts charging the capacitor Cs while the discharge circuit 23 stops operating.
  • the source voltage is equal to the source voltage threshold Vsth.
  • the filter unit 41 outputs a high level voltage
  • the latch unit 35 outputs a high level voltage.
  • the charging circuit 22 stops its operation, and the discharging circuit 23 releases the electric power stored in the capacitor Cs, so that the semiconductor switch 20 is switched off.
  • the latch unit 35 continues to output the high level voltage regardless of the voltage input from the OR circuit 40 and turns off the semiconductor switch 20. maintain.
  • the semiconductor switch 20 is switched off, the source voltage returns to zero volts.
  • the control circuit 25 operates the charging circuit 22 when the voltage detection unit 27 outputs a high level voltage for a predetermined time or longer.
  • the discharge circuit 23 is driven by stopping. Therefore, when the semiconductor switch 20 cannot be turned on due to a failure, power supply from the battery 10 to the load 12 via the current path is stopped, and wasteful power consumption is prevented.
  • the microcomputer 26 stops calculating the wire temperature when the second constant voltage Va is input from the control circuit 25 to the microcomputer 26, wasteful power consumption is further prevented.
  • control circuit 25 stops the operation of the charging circuit 22 and drives the discharging circuit 23 by the latch unit 35 outputting a high level voltage
  • the output circuit 24 is turned on by switching the switch 42 on. Is adjusted to a voltage outside the predetermined range. As a result, it is possible to notify the microcomputer 26 that power cannot be normally supplied via the current path.
  • the control circuit 25 also functions as an adjustment unit.
  • the semiconductor switch 20 is not limited to an N-channel FET, and may be an NPN bipolar transistor.
  • the drain, source and gate of the semiconductor switch 20 correspond to the collector, emitter and base of the bipolar transistor.
  • the connection destination of the capacitor Cs is not limited between the drain and the gate of the semiconductor switch 20. Since the capacitor Cs may be a capacitor having one end connected to the gate, the capacitor Cs may be a capacitor connected between the gate and the source of the semiconductor switch 20, for example. If one end of the capacitor Cs is connected to the gate, the charging circuit 22 charges the capacitor Cs while the operation of the discharging circuit 23 is stopped, so that the semiconductor switch with reference to the source potential of the semiconductor switch 20 is used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
PCT/JP2016/085225 2015-12-03 2016-11-28 給電制御装置 Ceased WO2017094681A1 (ja)

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US15/776,559 US10547194B2 (en) 2015-12-03 2016-11-28 Power supply control apparatus
EP16870618.2A EP3386063B1 (en) 2015-12-03 2016-11-28 Power supply control device
CN201680067675.5A CN108292851B (zh) 2015-12-03 2016-11-28 供电控制装置

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CN112968495A (zh) * 2021-03-03 2021-06-15 惠州Tcl移动通信有限公司 移动终端和控制电源开启或关闭的方法
TWI783490B (zh) * 2021-05-19 2022-11-11 瑞鼎科技股份有限公司 車用源極驅動電路及其運作方法

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CN108292851B (zh) 2021-03-16
JP6451612B2 (ja) 2019-01-16
EP3386063A4 (en) 2018-12-12
JP2017103964A (ja) 2017-06-08
US20180331556A1 (en) 2018-11-15
EP3386063A1 (en) 2018-10-10
US10547194B2 (en) 2020-01-28
CN108292851A (zh) 2018-07-17
EP3386063B1 (en) 2019-07-17

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