WO2023136128A1 - 電気機器及び車載システム - Google Patents

電気機器及び車載システム Download PDF

Info

Publication number
WO2023136128A1
WO2023136128A1 PCT/JP2022/048078 JP2022048078W WO2023136128A1 WO 2023136128 A1 WO2023136128 A1 WO 2023136128A1 JP 2022048078 W JP2022048078 W JP 2022048078W WO 2023136128 A1 WO2023136128 A1 WO 2023136128A1
Authority
WO
WIPO (PCT)
Prior art keywords
switch
voltage
connection
power supply
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/048078
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隼基 村田
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 US18/727,517 priority Critical patent/US20250174977A1/en
Priority to CN202280085834.XA priority patent/CN118414268A/zh
Publication of WO2023136128A1 publication Critical patent/WO2023136128A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for DC systems

Definitions

  • Patent Document 1 discloses an electric device mounted on a vehicle. One end of each of the signal line and the ground line is connected to the electric device. Electrical equipment has a ground terminal to be grounded. In the electrical equipment, the ground terminal is connected to one end of the ground wire. An electrical device outputs a signal using the potential of a ground line as a reference potential through a signal line.
  • FIG. 2 is a block diagram showing a configuration of main parts of an in-vehicle system according to Embodiment 1;
  • FIG. It is a top view of an electric equipment and a switch apparatus. 4 is a timing chart for explaining the operation of the switching circuit;
  • FIG. 11 is a block diagram showing the main configuration of an in-vehicle system according to Embodiment 2;
  • the present disclosure has been made in view of such circumstances, and its object is to provide an electrical device capable of preventing the inflow of overcurrent through a conductor, and an in-vehicle system including the electrical device. That's what it is.
  • the electronic component is, for example, a microcomputer, and outputs or detects a voltage based on the potential of the first connecting portion.
  • the second switch when the voltage between the first connection portion and the second connection portion exceeds the predetermined voltage, the second switch is turned on. This causes the voltage across the output and control ends of the switch to drop to 0V, which is below the threshold. As a result, the switch turns off.
  • An in-vehicle system is an in-vehicle system in which an electrical device outputs voltage to a second electrical device, or the second electrical device outputs voltage to the electrical device.
  • the electric device includes a first connection portion connected to a vehicle body, a second connection portion connected to the second electric device, and a connection portion connected between the first connection portion and the second connection portion. and a switching circuit for switching the switch on or off, wherein when the switch is on, current flows in the order of the second connection, the switch and the first connection, the switching circuit comprising: and switching the switch from ON to OFF when the voltage between the first connection and the second connection exceeds a predetermined voltage.
  • the substrate is connected to the second substrate by the conductor. For this reason, there is a high possibility that a power short-circuit of the conducting wire will occur. As a result, there is a high demand for a function that prevents overcurrent from flowing through the conductors in electrical equipment.
  • the electric device 10 has a power terminal 30 , a ground terminal 31 and a device connector 32 .
  • the switch device 11 has an input terminal 40 , an output terminal 41 , a device connector 42 , a power supply switch 43 and a drive circuit 44 .
  • the power supply switch 43 is an N-channel FET (Field Effect Transistor). When the power supply switch 43 is on, the resistance between the drain and source is sufficiently small. This allows current to flow through the drain and source. When the power supply switch 43 is off, the resistance between the drain and source is sufficiently large. Therefore, no current flows through the drain and source.
  • the drive circuit 44 switches the power supply switch 43 on or off.
  • the negative electrode of the DC power supply 20 is connected to the body E of the vehicle C.
  • Body E is a conductor.
  • a connection to the body E provides grounding.
  • a positive electrode of the DC power supply 20 is connected to one end of the power switch 21 .
  • the other end of the power switch 21 is detachably connected to the power terminal 30 of the electric device 10 and detachably connected to the input terminal 40 of the switch device 11 .
  • a ground terminal 31 of the electrical device 10 is connected to the body E. As shown in FIG.
  • the ground terminal 31 functions as a first connection portion.
  • One end of the load 22 is detachably connected to the output terminal 41 of the switch device 11 .
  • the other end of the load 22 is connected to the body E.
  • the device connector 32 of the electrical device 10 is detachably connected to one ends of the signal line F and the ground line G. As shown in FIG. The other ends of the signal line F and the ground line G are detachably connected to the device connector 42 of the switch device 11 . The signal line F and the ground line G are conducting lines.
  • the device connector 32 is connected to the device connector 42 by a signal line F and a ground line G.
  • FIG. The switch device 11 functions as an external device and a second electrical device.
  • the device connector 32 functions as a second connection.
  • the drain and source of the power supply switch 43 are connected to the input terminal 40 and the output terminal 41, respectively.
  • the power switch 21 When the power switch 21 is on, current flows from the positive electrode of the DC power supply 20 to the power switch 21 , the electrical equipment 10 , the body E, and the negative electrode of the DC power supply 20 in this order. Thereby, electric power is supplied to the electric device 10 .
  • the electric device 10 operates while the electric power is supplied to the electric device 10 .
  • the electric device 10 instructs the drive circuit 44 of the switch device 11 to switch the power supply switch 43 on or off.
  • the power switch 21 and the power supply switch 43 When the power switch 21 and the power supply switch 43 are on, the current flows from the positive terminal of the DC power supply 20 to the power switch 21, the input terminal 40, the power supply switch 43, the output terminal 41, the load 22, the body E and the negative terminal of the DC power supply 20. flow in the order of Thereby, power is supplied to the load 22 .
  • the power switch 21 or the power supply switch 43 When the power switch 21 or the power supply switch 43 is off, current flow through the power supply switch 43 is stopped. Therefore, power supply from the DC power supply 20 to the load 22 is stopped.
  • the load 22 is, for example, a lamp.
  • the load 22 operates while the DC power supply 20 is supplying power to the load 22 .
  • the load 22 stops operating.
  • the electrical equipment 10 and the switch device 11 control power supply from the DC power supply 20 to the load 22 .
  • the power switch 21 is off, power supply from the DC power supply 20 to the electrical equipment 10 stops. In this case, the electrical device 10 has stopped operating.
  • the electrical equipment 10 has a switching circuit 33 , a regulator 34 , a microcomputer (hereinafter referred to as a microcomputer) 35 , and a connection switch 36 in addition to a power terminal 30 , a ground terminal 31 and a device connector 32 .
  • the switching circuit 33 has a circuit switch 50 , a first circuit resistor 51 and a second circuit resistor 52 .
  • the connection switch 36 and the circuit switch 50 are NPN type bipolar transistors.
  • the power supply terminal 30 is connected to one end of the first circuit resistor 51 of the switching circuit 33 and the regulator 34 .
  • the other end of the first circuit resistor 51 is connected to the collector of the circuit switch 50 .
  • Circuit switch 50 functions as a second switch.
  • the base of circuit switch 50 is connected to one end of second circuit resistor 52 .
  • a connection node between the collector of the circuit switch 50 and the first circuit resistor 51 is connected to the base of the connection switch 36 .
  • the emitter and collector of the connection switch 36 are connected to the ground terminal 31 and the device connector 32, respectively.
  • the emitter of circuit switch 50 is connected to the connection node between the emitter of connection switch 36 and ground terminal 31 .
  • the other end of the second circuit resistor 52 is connected to the ground terminal 31 .
  • the regulator 34 is further connected to the ground terminal 31 and the microcomputer 35.
  • the microcomputer 35 is also connected to the ground terminal 31 and the equipment connector 32 .
  • a connection node between the instrument connector 32 and the collector of the connection switch 36 is connected to a connection node between the base of the circuit switch 50 and the second circuit resistor 52 .
  • the gate of the power supply switch 43 is connected to the drive circuit 44 .
  • the drive circuit 44 is further connected to the connection node between the input terminal 40 and the power supply switch 43 and the device connector 42 .
  • the regulator 34 and the first circuit resistor 51 are connected to the power switch 21 via the power terminal 30 .
  • the regulator 34 , the microcomputer 35 , the emitter of the connection switch 36 , the emitter of the circuit switch 50 and the other end of the second circuit resistor 52 are connected to the body E via the ground terminal 31 .
  • the microcomputer 35 is connected to the signal line F via the equipment connector 32 .
  • the collector of the connection switch 36 , the base of the circuit switch 50 , and one end of the second circuit resistor 52 are each connected to the ground line G via the device connector 32 .
  • the drive circuit 44 is separately connected to the signal line F and the ground line G via the device connector 42 .
  • the drain of the power supply switch 43 and the drive circuit 44 are each connected to the power switch 21 via the input terminal 40 .
  • a source of the power supply switch 43 is connected to the load 22 via the output terminal 41 .
  • FIG. 2 is a plan view of the electrical equipment 10 and the switch device 11.
  • Each of the electrical device 10 and the switch device 11 has a device substrate Bm and a device substrate Bs.
  • Each of the device substrate Bm and the device substrate Bs has a rectangular plate shape.
  • a regulator 34, a microcomputer 35, a connection switch 36, a circuit switch 50, a first circuit resistor 51 and a second circuit resistor 52 are arranged on the wide surface of the device substrate Bm.
  • Each of the regulator 34 and the microcomputer 35 is, for example, an integrated circuit element. With respect to a plate, the wide face is a different face than the end faces.
  • a power supply switch 43 and a drive circuit 44 are arranged on the wide surface of the device substrate Bs.
  • the drive circuit 44 is, for example, an integrated circuit element.
  • the equipment board Bm and the device board Bs are connected by a signal line F.
  • the equipment board Bm and the device board Bs are further connected by a ground line G.
  • FIG. 2 illustration of the power supply terminal 30, the ground terminal 31, the device connector 32, the input terminal 40, the output terminal 41, and the device connector 42 is omitted.
  • the power terminal 30, the ground terminal 31, and the device connector 32 are arranged on the wide surface of the device board Bm.
  • the input terminal 40, the output terminal 41 and the device connector 42 are arranged on the wide surface of the device board Bs.
  • the device substrate Bs functions as a second substrate.
  • the voltage of the positive electrode of the DC power supply 20 with the potential of the negative electrode is referred to as the power supply voltage. Since the ground terminal 31 is connected to the body E, the power supply voltage is a positive voltage with the potential of the ground terminal 31 as a reference potential.
  • the power switch 21 When the power switch 21 is on, current flows from the positive terminal of the DC power supply 20 to the power switch 21, the power terminal 30, the regulator 34, the ground terminal 31, the body E, and the negative terminal of the DC power supply 20 in this order.
  • the power supply voltage of the DC power supply 20 is applied to the regulator 34 and power is supplied to the regulator 34 .
  • Regulator 34 operates while power is being supplied.
  • the regulator 34 steps down the power supply voltage to a constant target voltage.
  • the regulator 34 applies the target voltage obtained by stepping down to the microcomputer 35 .
  • the target voltage is a voltage with the potential of the ground terminal 31 as a reference potential.
  • the power supply voltage is, for example, 12V.
  • the target voltage is 3.3V, 5.5V, or the like.
  • the regulator 34 applies the target voltage to the microcomputer 35, the current flows from the positive terminal of the DC power supply 20 to the power switch 21, the power terminal 30, the regulator 34, the microcomputer 35, the ground terminal 31, the body E, and the DC power supply 20. Electricity is supplied to the microcomputer 35 by flowing in the order of the negative electrode.
  • the microcomputer 35 operates while power is being supplied.
  • the drive circuit 44 While the power supplied to the drive circuit 44 of the switch device 11 is less than the predetermined power, the drive circuit 44 stops operating. The drive circuit 44 operates while the power supplied to the drive circuit 44 is equal to or higher than the predetermined power.
  • connection switch 36 and the circuit switch 50 For each of the connection switch 36 and the circuit switch 50, the resistance between the collector and emitter is sufficiently small when the state is ON. Therefore, current can flow in the order collector and emitter. For each connection switch 36 and circuit switch 50, the resistance between the collector and emitter is sufficiently high when the state is off. Therefore, no current flows through the collector and emitter.
  • the switching circuit 33 switches the connection switch 36 on or off according to the voltage of the ground line G with the potential of the ground terminal 31 as a reference potential.
  • the connection switch 36 When the power switch 21 is on and the connection switch 36 is on, the current flows from the positive pole of the DC power supply 20 to the power switch 21, the input terminal 40, the drive circuit 44, the device connector 42, the ground line G, the equipment. It flows through the connector 32 , the connection switch 36 , the ground terminal 31 , the body E, and the negative electrode of the DC power supply 20 in that order. Due to this current flow, the drive circuit 44 is supplied with power equal to or greater than the predetermined power.
  • the connection switch 36 When the connection switch 36 is on, the current flows in the order of the collector and the emitter in the connection switch 36 . Therefore, the collector of the connection switch 36 functions as an input terminal to which current is input. The emitter of the connection switch 36 functions as an output terminal through which current is output.
  • the current flows from the positive terminal of the DC power supply 20 to the power switch 21, the input terminal 40, the drive circuit 44, the device connector 42, the ground line G, the equipment.
  • the current flows through the connector 32 , the second circuit resistor 52 , the ground terminal 31 , the body E, and the negative electrode of the DC power supply 20 in this order. Since the current flows through the second circuit resistor 52, the power supplied to the drive circuit 44 is small. As a result, the power supplied to the drive circuit 44 is less than the predetermined power due to the current flowing through the drive circuit 44 and the second circuit resistor 52 .
  • the state of the power supply switch 43 when the voltage of the gate with the potential of the source as the reference potential is equal to or higher than a certain voltage, the state is ON. When the voltage of the gate with the potential of the source as the reference potential is less than the constant voltage, the state of the power supply switch 43 is off.
  • the microcomputer 35 of the electric device 10 outputs a high level voltage or a low level voltage to the drive circuit 44 of the switch device 11 via the signal line F.
  • the output voltage of the microcomputer 35 is a voltage with the potential of the ground terminal 31 as a reference potential.
  • the microcomputer 35 functions as an electronic component.
  • the microcomputer 35 switches the output voltage to be output to the drive circuit 44 via the signal line F to a low level voltage or a high level voltage.
  • the drive circuit 44 detects the voltage of the signal line F using the potential of the ground line G as a reference potential. When the connection switch 36 is on, the potential of the ground line G substantially matches the potential of the ground terminal 31, that is, the ground potential. Therefore, the voltage of the signal line F detected by the drive circuit 44 is the output voltage of the microcomputer 35 .
  • the drive circuit 44 switches the gate of the power supply switch 43 to the ground line G potential as the reference potential. Increase voltage. As a result, in the power supply switch 43, the voltage of the gate with the potential of the source as the reference potential rises to a value equal to or higher than a certain voltage, and the power supply switch 43 is turned on.
  • the drive circuit 44 lowers the voltage of the gate of the power supply switch 43 with the potential of the ground line G as the reference potential.
  • the voltage of the gate with the potential of the source as the reference potential drops to a value less than the constant voltage, and the power supply switch 43 is switched off.
  • connection switch 36 When the switching circuit 33 switches the connection switch 36 from ON to OFF, current flow through the ground line G, the connection switch 36 and the ground terminal 31 stops.
  • connection switch 36 is ON when the base voltage with the emitter potential as the reference potential is equal to or higher than a certain threshold.
  • the threshold is positive. If the voltage at the base referenced to the potential at the emitter is less than the threshold, the state is off. Therefore, the connection switch 36 is switched from ON to OFF when the voltage of the base with the potential of the emitter as the reference potential drops to a value less than the threshold.
  • the base of connection switch 36 functions as a control end.
  • the state is ON when the base voltage with the emitter potential as the reference potential is equal to or higher than a certain reference voltage. If the voltage at the base, referenced to the potential at the emitter, is less than the reference voltage, the state is off.
  • the reference voltage is positive.
  • the emitter of circuit switch 50 is connected to ground terminal 31 .
  • the base of the circuit switch 50 is connected to the ground line G. Therefore, regarding the circuit switch 50, the voltage of the base with the potential of the emitter as the reference potential is the voltage of the ground line G with the potential of the ground terminal 31 as the reference potential.
  • the circuit switch 50 is switched from OFF to ON when the voltage of the ground line G with the potential of the ground terminal 31 as a reference potential rises to a value equal to or higher than the reference voltage.
  • the voltage of the ground line G matches the voltage of the portion of the device connector 32 that is connected to the ground line G. FIG. Therefore, the voltage on the ground line G corresponds to the voltage on the device connector 32 .
  • FIG. 3 is a timing chart for explaining the operation of the switching circuit 33.
  • the voltage of the base with the potential of the ground terminal 31 as the reference potential is referred to as the base voltage.
  • FIG. 3 shows transitions of the base voltage and the ground line G voltage.
  • the reference potential of the voltage of the ground line G is the potential of the ground terminal 31, that is, the potential of the body E.
  • the voltage on the ground line G corresponds to the voltage on the equipment connector 32 .
  • FIG. 3 shows transitions of states of the power switch 21, the circuit switch 50, and the connection switch 36.
  • Vb is the power supply voltage of the DC power supply 20 .
  • Vth and Vr are the threshold and reference voltages, respectively.
  • the power supply voltage is a positive voltage with the potential of the ground terminal 31 as a reference potential.
  • the ground line G is arranged between the equipment board Bm and the device board Bs. Therefore, the ground wire G may come into contact with the conductor connected to the positive electrode of the DC power supply 20 . If the ground wire G contacts the conducting wire, the ground wire G may be connected to the positive electrode of the DC power supply 20 . A phenomenon in which the ground line G is connected to the positive terminal of the DC power supply 20 is called power fault. When a power short-circuit occurs in the ground line G, the voltage of the ground line G rises to the power supply voltage Vb.
  • the circuit switch 50 When the circuit switch 50 is off, little current flows through the first circuit resistor 51 . Therefore, when the power switch 21 is switched from off to on, the base voltage of the connection switch 36 rises to the power supply voltage Vb. Since the threshold Vth is equal to or lower than the power supply voltage Vb, the connection switch 36 is switched from off to on when the base voltage of the connection switch 36 rises to the power supply voltage Vb. As described above, when the connection switch 36 is on, the potential of the ground line G substantially matches the potential of the ground terminal 31, that is, the ground potential.
  • the circuit switch 50 When a short-circuit occurs in the ground line G, the voltage of the ground line G rises to the power supply voltage Vb. Since the power supply voltage Vb is equal to or higher than the reference voltage Vr, the circuit switch 50 is switched from off to on when the voltage of the ground line G rises to the power supply voltage Vb. When the circuit switch 50 turns on, the base voltage of the connection switch 36 drops to 0V, which is below the threshold Vth. As a result, the connection switch 36 is switched from on to off.
  • connection switch 36 When the connection switch 36 is off, no current flows through the ground line G and the connection switch 36. Current flows through the ground line G, the device connector 32 , the second circuit resistor 52 and the ground terminal 31 in this order. Since the current flows through the second circuit resistance 52, the current flowing into the electric device 10 through the ground line G is small. Inflow of overcurrent to the electrical equipment 10 via the ground line G is prevented.
  • the resistance of the second circuit resistor 52 is sufficiently greater than the collector-to-emitter resistance of the connection switch 36 that is on.
  • connection switch 36 is kept off while the voltage of the ground line G is equal to or higher than the reference voltage Vr.
  • the power supply switch 21 When the power supply switch 21 is turned on and the grounding wire G is disconnected, the current flows from the positive electrode of the DC power supply 20 to the power switch 21, the input terminal 40, the drive circuit 44, the device connector 42, and the grounding wire G. , the device connector 32 , the second circuit resistor 52 , the ground terminal 31 , the body E, and the negative electrode of the DC power supply 20 . As a result, the voltage of the ground line G drops below the reference voltage Vr. As a result, the circuit switch 50 switches from ON to OFF.
  • the connection switch 36 When the circuit switch 50 is switched off, the base voltage of the connection switch 36 rises to the power supply voltage Vb, and the connection switch 36 is switched from off to on.
  • the connection switch 36 When the connection switch 36 is turned on, the voltage of the ground line G drops to 0V.
  • the resistance value of the second circuit resistor 52 is from the positive electrode of the DC power supply 20, and the current is from the power switch 21, the input terminal 40, the drive circuit 44, the device connector 42, the ground line G, the device connector 32, the second circuit resistor 52, This is the value at which the voltage of the ground line G drops to a voltage less than the reference voltage Vr when the current flows in the order of the ground terminal 31, the body E, and the negative electrode of the DC power supply 20.
  • the switching circuit 33 switches the connection switch 36 from ON to OFF when the voltage of the ground line G with the potential of the ground terminal 31 as a reference potential rises to a value equal to or higher than the reference voltage. Therefore, when the ground line G is short-circuited to the power supply, the connection switch 36 is switched from ON to OFF, and overcurrent is prevented from flowing into the electric device 10 via the ground line G. Since the device board Bm is connected to the device board Bs of the switch device 11 by the ground line G, there is a high possibility that the ground line G will be short-circuited. Therefore, there is a high need for a function to prevent overcurrent from flowing through the ground line G.
  • the switching performed by the switching circuit 33 does not use a processing element that executes processing according to a program.
  • the switching circuit 33 is configured by hardware. Therefore, the period from when the voltage of the ground line G with the potential of the ground terminal 31 as a reference potential rises to a value equal to or higher than the reference voltage until the connection switch 36 is switched from on to off is short.
  • the load 22 is arranged outside the switch device 11 .
  • the place where the load 22 is arranged is not limited to the outside of the switch device 11 .
  • switch device 11 may have load 22 .
  • the load 22 is arranged, for example, on the wide surface of the device board Bs of the switch device 11 .
  • the power supply switch 43 of the switch device 11 is a switch that can be switched by the drive circuit 44 . Therefore, the power supply switch 43 is not limited to an N-channel FET, and may be a P-channel FET, a bipolar transistor, a relay contact, or the like. Also, if the device connected to the electric device 10 is a device that operates according to the output voltage of the microcomputer 35, there is no problem. Therefore, the device connected to the electrical device 10 is not limited to the switch device 11. FIG.
  • Embodiment 2 The electric device 10 according to the first embodiment outputs voltage to the switch device 11 via the signal line F.
  • FIG. the operation performed by the electrical device 10 is not limited to voltage output.
  • the points of the second embodiment that are different from the first embodiment will be described. Configurations other than those described later are common to those of the first embodiment. For this reason, the same reference numerals as in Embodiment 1 are given to the components that are common to Embodiment 1, and the description of those components is omitted.
  • FIG. 4 is a block diagram showing the main configuration of the in-vehicle system 1 according to the second embodiment.
  • the in-vehicle system 1 according to the second embodiment has a temperature detection device 12 instead of the switch device 11 .
  • the temperature detection device 12 is mounted on the vehicle C. As shown in FIG. Temperature sensing device 12 has a second device connector 60 . In Embodiment 2, the temperature detection device 12 functions as an external device and a second electrical device.
  • the device connector 32 of the electrical device 10 is detachably connected to one ends of the signal line F and the ground line G.
  • the device connector 32 is also detachably connected to one end of the voltage line H.
  • the other ends of the voltage line H, the signal line F and the ground line G are detachably connected to the second device connector 60 of the temperature detection device 12 .
  • the voltage line H is a conducting wire.
  • the temperature detection device 12 detects the temperature inside the vehicle C, the temperature of the semiconductor switch, or the like.
  • the temperature detection device 12 outputs a voltage indicating the detected temperature to the electrical equipment 10 .
  • connection node between the power terminal 30 and the first circuit resistor 51 of the switching circuit 33 is connected to the device connector 32 .
  • This connection node is connected to the voltage line H via the equipment connector 32 .
  • the temperature detection device 12 has a fixed resistor 61 and a thermistor 62 in addition to the second device connector 60 .
  • the resistance value of the fixed resistor 61 is constant regardless of the temperature of the fixed resistor 61 .
  • the resistance value of the thermistor 62 varies according to the temperature of the thermistor 62 .
  • the thermistor 62 is of the NTC (Negative Temperature Coefficient) type
  • the thermistor 62 is of the PTC (Positive Temperature Coefficient) type
  • the environmental temperature around the thermistor 62 can be detected using the thermistor 62 . Therefore, when detecting the temperature in the interior of the vehicle C, the thermistor 62 is arranged in the interior of the vehicle C. As shown in FIG. When detecting the temperature of the semiconductor switch, it is arranged near the semiconductor switch.
  • One end of the fixed resistor 61 is connected to the second device connector 60 .
  • the other end of the fixed resistor 61 is connected to one end of the thermistor 62 .
  • the other end of the thermistor 62 is connected to the second device connector 60 .
  • a connection node between the fixed resistor 61 and the thermistor 62 is connected to the second device connector 60 .
  • One end of the fixed resistor 61 is connected to the voltage line H via the second device connector 60 .
  • a connection node between the fixed resistor 61 and the thermistor 62 is connected to the signal line F via the second device connector 60 .
  • the other end of thermistor 62 is connected to ground line G via second device connector 60 .
  • the temperature detection device 12 may have a device substrate Bs, like the switch device 11 of the first embodiment.
  • a second device connector 60, a fixed resistor 61 and a thermistor 62 are arranged on the wide surface of the device substrate Bs.
  • the switching circuit 33 keeps the connection switch 36 on when the ground line G is not short-circuited to power.
  • the current flows from the positive electrode of the DC power supply 20 to the power switch 21, the power terminal 30, the device connector 32, the voltage line H, the second device connector 60, the fixed resistor 61, The thermistor 62 , the second device connector 60 , the ground line G, the device connector 32 , the circuit switch 50 , the ground terminal 31 , the body E, and the negative electrode of the DC power supply 20 flow in this order.
  • the power supply voltage of the DC power supply 20 is applied between one end of the fixed resistor 61 and the other end of the thermistor 62 via the voltage line H and the ground line G.
  • the fixed resistor 61 and the thermistor 62 divide the power supply voltage.
  • a divided voltage obtained by dividing the voltage is output from the temperature detection device 12 to the microcomputer 35 of the electric device 10 via the signal line F.
  • FIG. The divided voltage is a voltage using the potential of the ground line G as a reference potential.
  • the microcomputer 35 outputs a high level voltage or a low level voltage via the signal line F.
  • the microcomputer 35 detects the voltage of the signal line F using the potential of the ground terminal 31 as a reference potential instead of outputting the voltage.
  • the connection switch 36 is on, the voltage detected by the microcomputer 35 substantially matches the divided voltage.
  • the resistance value of the second circuit resistor 52 is adjusted so that the voltage of the ground line G with the potential of the ground terminal 31 as a reference potential drops below the reference voltage Vr. Therefore, the resistance value of the second circuit resistor 52 is less than the minimum combined resistance value of the fixed resistor 61 and the thermistor 62 .
  • Embodiment 2 the locations where the fixed resistor 61 and the thermistor 62 are connected may be exchanged. In this case, one end of the fixed resistor 61 is connected to the ground line G. FIG. The other end of the thermistor 62 is connected to the voltage line H. When the locations where the fixed resistor 61 and the thermistor 62 are connected are switched, the divided voltage is lower as the resistance value of the thermistor 62 is larger.
  • the voltage applied to the circuit including the fixed resistor 61 and the thermistor 62 is not limited to the power supply voltage, and may be the target voltage generated by the regulator 34, for example.
  • the connection node between the regulator 34 and the microcomputer 35 is connected to the voltage line H through the device connector 32 instead of the connection node between the power supply terminal 30 and the first circuit resistor 51 .
  • a fixed resistor 61 and a thermistor 62 divide the target voltage.
  • connection switch 36 is not limited to an NPN-type bipolar transistor, and may be an N-channel FET, an IGBT (Insulated Gate Bipolar Transistor), or the like.
  • circuit switch 50 is not limited to an NPN-type bipolar transistor, and may be an N-channel FET, IGBT, or the like.
  • the power terminal 30 of the electrical device 10 may be directly connected to the positive electrode of the DC power supply 20 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)
PCT/JP2022/048078 2022-01-12 2022-12-27 電気機器及び車載システム Ceased WO2023136128A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US18/727,517 US20250174977A1 (en) 2022-01-12 2022-12-27 Electrical equipment and in-vehicle system
CN202280085834.XA CN118414268A (zh) 2022-01-12 2022-12-27 电气设备及车载系统

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-003272 2022-01-12
JP2022003272A JP7666339B2 (ja) 2022-01-12 2022-01-12 電気機器及び車載システム

Publications (1)

Publication Number Publication Date
WO2023136128A1 true WO2023136128A1 (ja) 2023-07-20

Family

ID=87279077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/048078 Ceased WO2023136128A1 (ja) 2022-01-12 2022-12-27 電気機器及び車載システム

Country Status (4)

Country Link
US (1) US20250174977A1 (https=)
JP (1) JP7666339B2 (https=)
CN (1) CN118414268A (https=)
WO (1) WO2023136128A1 (https=)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017060032A (ja) * 2015-09-17 2017-03-23 新日本無線株式会社 出力回路
JP2018013401A (ja) * 2016-07-20 2018-01-25 株式会社デンソーテン 空燃比センサの制御装置および異常検出方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3314922B2 (ja) 1999-06-21 2002-08-19 ナルデック株式会社 負荷駆動システム及びその故障検出方法
JP4149778B2 (ja) * 2002-10-28 2008-09-17 矢崎総業株式会社 車両用電力制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017060032A (ja) * 2015-09-17 2017-03-23 新日本無線株式会社 出力回路
JP2018013401A (ja) * 2016-07-20 2018-01-25 株式会社デンソーテン 空燃比センサの制御装置および異常検出方法

Also Published As

Publication number Publication date
CN118414268A (zh) 2024-07-30
JP7666339B2 (ja) 2025-04-22
US20250174977A1 (en) 2025-05-29
JP2023102646A (ja) 2023-07-25

Similar Documents

Publication Publication Date Title
US11038371B2 (en) Power supply control device
CN109314386B (zh) 供电控制装置
US10135234B2 (en) Preventive apparatus
KR100355685B1 (ko) 전력반도체스위치및자동전기시스템
CN111033288B (zh) 异常检测装置
WO2023136128A1 (ja) 電気機器及び車載システム
US10921384B2 (en) Disconnection sensing circuit and electrical connection box
US10599198B2 (en) Load driving device
JP2019198171A (ja) 電力供給装置
JP7697348B2 (ja) 制御装置
US12587003B2 (en) On-board device
CN113785255A (zh) 电压调节器以及车载用的备用电源
CN113728290A (zh) 电压调节器及车载用的备用电源
US11829179B2 (en) Integrated circuit and method for limiting a switchable load current
JP7310591B2 (ja) 駆動装置
US20250233404A1 (en) Switch device, electronic device and vehicle
US7906946B2 (en) Semiconductor integrated circuit device for providing series regulator
US20250309884A1 (en) Switch device, load drive system, and switch system
US12181946B2 (en) Abnormality detection circuit, semiconductor device, electronic apparatus, and vehicle
US20240170956A1 (en) Signal output circuit and semiconductor integrated circuit device
JP2025148149A (ja) サージ保護回路
JP2020137352A (ja) 電力供給装置
JP4327611B2 (ja) 短絡用回路およびエンジンのアンチノック制御装置
JP2025135319A (ja) 半導体装置、電子機器、車両
JPH04326108A (ja) 負荷駆動制御装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22919291

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280085834.X

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 18727517

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22919291

Country of ref document: EP

Kind code of ref document: A1

WWP Wipo information: published in national office

Ref document number: 18727517

Country of ref document: US