WO2022006845A1 - 车载dc/dc搭铁线检测电路 - Google Patents

车载dc/dc搭铁线检测电路 Download PDF

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Publication number
WO2022006845A1
WO2022006845A1 PCT/CN2020/101311 CN2020101311W WO2022006845A1 WO 2022006845 A1 WO2022006845 A1 WO 2022006845A1 CN 2020101311 W CN2020101311 W CN 2020101311W WO 2022006845 A1 WO2022006845 A1 WO 2022006845A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
converter
resistor
detection circuit
ground wire
Prior art date
Application number
PCT/CN2020/101311
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English (en)
French (fr)
Inventor
陈丽君
吴壬华
Original Assignee
深圳欣锐科技股份有限公司
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 深圳欣锐科技股份有限公司 filed Critical 深圳欣锐科技股份有限公司
Priority to EP20943999.1A priority Critical patent/EP4186732A4/en
Priority to CN202080006016.7A priority patent/CN112997090B/zh
Priority to PCT/CN2020/101311 priority patent/WO2022006845A1/zh
Publication of WO2022006845A1 publication Critical patent/WO2022006845A1/zh
Priority to US18/094,531 priority patent/US20230160976A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/02—Electric propulsion with power supply external to the vehicle using dc motors
    • B60L9/08—Electric propulsion with power supply external to the vehicle using dc motors fed from ac supply lines
    • B60L9/12—Electric propulsion with power supply external to the vehicle using dc motors fed from ac supply lines with static converters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output

Definitions

  • the present application relates to the technical field of electronic circuits, in particular to a vehicle-mounted DC/DC ground wire detection circuit.
  • new energy vehicles have been increasingly recognized by the public due to the demand for environmental protection, and the use of new energy vehicles has become more and more popular. Since the new energy vehicle uses the power lithium battery to drive the motor to obtain power, the DC generator driven by the internal combustion engine through the belt is no longer used, and the on-board DC/DC converter is replaced.
  • the on-board DC/DC converter since the load of the low-voltage electrical appliances in the vehicle is between 1KW-3KW, the on-board DC/DC converter also needs to provide an output capacity of 1KW-3KW, and the output current is between 70A-200A. Due to the relatively large current, the required output copper cable cross-sectional area is relatively large and expensive.
  • the on-board DC/DC converter generally has only one output positive wire connected to the low-voltage battery.
  • the negative output of the on-board DC/DC converter is directly connected to the frame with a ground wire nearby, and the low-voltage battery is also connected to the frame with a ground wire nearby.
  • the output current of the on-board DC/DC converter is connected to the frame from the positive pole. It flows to the low-voltage battery through the output line, and then flows back to the vehicle DC/DC through the negative ground wire of the low-voltage battery, the body, and the DC/DC ground wire.
  • the on-board DC/DC converter needs a low-voltage battery for power supply, and its standby circuit has positive and negative inputs. The input is connected to the body through the negative pole of the low-voltage battery. If the DC/DC ground wire is not in good contact with the body, or the ground wire of the low-voltage battery is not in good contact, the impedance is too large or even disconnected, which will cause Hundreds of amps of current flow back to DC/DC through the shielding layer or the negative line of the standby circuit, which will eventually cause the wiring harness to heat up severely until it burns out.
  • the embodiments of the present application provide a vehicle-mounted DC/DC ground wire detection circuit, which is helpful for detecting the disconnection of the ground wire and avoids the wiring harness burning due to continuous output of excessive current.
  • a first aspect of the embodiments of the present application provides a vehicle-mounted DC/DC ground wire detection circuit, including: a DSP controller, a detection circuit, a vehicle-mounted DC/DC converter standby circuit, and a vehicle-mounted DC/DC converter power supply negative line, wherein,
  • the DSP controller is connected to the detection circuit, and the detection circuit is respectively connected to the standby circuit of the vehicle-mounted DC/DC converter and the negative power supply line of the vehicle-mounted DC/DC converter; the detection circuit is also connected to an external input voltage connection;
  • the detection circuit includes a comparator, a first conductive branch, a second conductive branch, and a third conductive branch; the comparator includes a forward input terminal and a reverse input terminal, and the forward input terminal is connected to the The second conductive branch is connected, and the reverse input terminal is connected to the first conductive branch.
  • the first conductive branch includes a resistor R1, a resistor R2 and a capacitor C1, wherein,
  • One end of the resistor R1 is connected to the external input voltage, the other end of the resistor R1 is connected to the inverting input end of the comparator, one end of the resistor R2 and one end of the capacitor C1, the resistor The other end of R2 and the other end of the capacitor C1 are grounded.
  • the second conductive branch includes a resistor R3, a resistor R4 and a capacitor C2, wherein,
  • One end of the resistor R3 is connected to the external input voltage, and the other end of the resistor R3 is connected to one end of the resistor R4, the positive input end of the comparator and one end of the capacitor C2, so The other end of the resistor R4 and the other end of the capacitor C2 are connected to the negative power supply line of the vehicle-mounted DC/DC converter.
  • the third conductive branch includes a resistor R5, wherein:
  • One end of the resistor R5 is connected to the standby circuit of the vehicle-mounted DC/DC converter and ground, and the other end of the resistor R5 is connected to the negative power supply line of the vehicle-mounted DC/DC converter.
  • the circuit further includes:
  • the first conductive branch and the second conductive branch are connected to the external input voltage, the second conductive branch and the third conductive branch and the negative power supply line of the vehicle DC/DC converter connect.
  • the comparator is a voltage comparator, wherein,
  • the forward input voltage of the comparator is provided by the external input voltage through the resistor R3 and the resistor R4, and the reverse input voltage of the comparator is provided by the external input voltage through the resistor R1 and the resistor R1 Resistor R2 is provided.
  • the DSP control circuit is used to control the on-board DC/DC converter standby circuit to be turned on or off.
  • the DSP control circuit is further configured to control the on-board DC/DC converter standby circuit to increase or decrease the output current.
  • a second aspect of the present application provides a vehicle-mounted device, including the vehicle-mounted DC/DC ground wire detection circuit disclosed in the first aspect of the embodiments of the present application.
  • the vehicle DC/DC ground wire detection circuit includes a DSP controller, a detection circuit, a vehicle DC/DC converter standby circuit, a vehicle DC/DC converter power supply negative line, a DSP controller and a detection circuit connection, the detection circuit is respectively connected with the vehicle-mounted DC/DC converter standby circuit and the vehicle-mounted DC/DC converter power supply negative line; the detection circuit is also connected with the external input voltage, and the detection circuit includes a comparator, a first conductive branch, a second conductive branch The branch and the third conductive branch, the comparator includes a forward input terminal and a reverse input terminal, the forward input terminal is connected to the second conductive branch, and the reverse input terminal is connected to the first conductive branch; thus, in the DSP A detection circuit is connected between the controller and the standby circuit of the on-board DC/DC converter and the negative line of the power supply of the on-board DC/DC converter.
  • the detection circuit can detect that the ground wire of the DC/DC converter is disconnected or the contact is poor, causing the negative wire of the vehicle DC/DC converter to flow too much. Therefore, to avoid continuous output of large current and cause the wiring harness to burn out.
  • FIG. 1 is a schematic structural diagram of a wiring circuit of a vehicle-mounted DC/DC converter ground wire provided in an embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of a vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of another vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application.
  • the high current in the embodiments of the present application may refer to electronic components in the circuit that consume more current than normal, and the range exceeds the standard current, which is an electronic fault phenomenon.
  • FIG. 1 is a schematic structural diagram of a wiring circuit of a vehicle-mounted DC/DC converter grounding wire provided in an embodiment of the application.
  • the wiring circuit may include: a power battery 101 , a vehicle-mounted DC/DC converter 102 , and a vehicle-mounted DC/DC converter 102 .
  • Controller 103 and battery 104 wherein:
  • the power battery 101 is connected to the on-board DC/DC converter 102 through the shielding layer of the high-voltage cable, the on-board DC/DC converter 102 is connected to the negative pole of the battery 104 through the negative power supply line of the on-board DC/DC converter, and the on-board DC/DC converter 102 passes through
  • the positive power supply line of the vehicle DC/DC converter is connected to the vehicle controller 103, the vehicle controller 103 is connected to the positive pole of the battery 104, and the positive pole of the battery 104 is connected to the vehicle DC/DC converter 102 through the vehicle DC/DC positive output line , the negative pole of the battery 104 is connected to the frame or the body through the battery ground wire, the vehicle DC/DC converter 102 is connected to the frame or the body through the DC/DC ground wire, and the shielding layer of the high-voltage cable is connected to the frame or the body through the ground wire.
  • the high-voltage shielding layer is connected to the frame or body to maintain the shielding effect
  • the battery 104 is used to supply power to the on-board DC/DC converter 102
  • the vehicle controller 103 is used to control the on-off condition of the on-board DC/DC converter 102 .
  • the working principle of the wiring circuit of the vehicle-mounted DC/DC converter ground wire shown in FIG. 1 is as follows: under normal circumstances, the vehicle-mounted DC/DC converter 102 is connected to the vehicle frame or the vehicle body through a DC/DC ground wire. Connection, the battery 104 is connected to the frame or the body through a battery ground wire, and the output current of the on-board DC/DC converter 102 flows from the positive pole to the battery 104 through the on-board DC/DC positive output wire, and then passes through the battery ground wire, The body or frame, and the DC/DC ground wire flow back to the on-board DC/DC converter 102 .
  • the on-board DC/DC converter 102 needs power supply from the battery 104, and at the same time, there is a standby circuit inside the on-board DC/DC converter 102, the standby circuit has positive and negative inputs, and the positive electrode is controlled by the vehicle
  • the on-off device 103 controls the on-off to control the on-board DC/DC converter 102 to be turned on or off.
  • the negative input of the standby circuit in the on-board DC/DC converter 102 is connected to the vehicle body by connecting to the negative electrode of the battery 104.
  • the impedance of the battery ground wire may be too large or even disconnected, and finally, the upper The current of 100 amps flows back to the on-board DC/DC converter 102 through the shielding layer of the high-voltage cable or the negative wire of the standby circuit in the on-board DC/DC converter 102 , causing the wiring harness to generate serious heat until it burns out.
  • FIG. 2 is a schematic structural diagram of a vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application.
  • the vehicle-mounted DC/DC ground wire detection circuit includes: a DSP controller 201, a detection circuit 202, The vehicle-mounted DC/DC converter standby circuit 203 and the vehicle-mounted DC/DC converter power supply negative line 204, wherein:
  • the DSP controller 201 is connected to the detection circuit 202, which is respectively connected to the vehicle DC/DC converter standby circuit 203 and the vehicle DC/DC converter power supply negative line 204, and the detection circuit 202 is also connected to an external input voltage.
  • the DSP controller 201 can be used to control the on-board DC/DC converter standby circuit 203 to increase or decrease the output current and control the on or off state of the on-board DC/DC converter standby circuit 203
  • the detection circuit 202 can be used to detect the on-board DC/DC converter standby circuit 203.
  • the working condition of the DC/DC converter standby circuit 203 for example, the detection circuit 202 can be used to detect the disconnection or poor contact of the ground wire in the vehicle-mounted DC/DC converter standby circuit 203 .
  • the structural schematic diagram of the vehicle-mounted DC/DC ground wire detection circuit shown in FIG. 2 can detect the abnormal situation of the wiring circuit of the ground wire connected to the vehicle-mounted DC/DC converter 102 as shown in FIG. 1 .
  • the ground wire is disconnected or the contact is poor.
  • the DSP controller 201 can be connected to the standby circuit 203 of the on-board DC/DC converter and the negative power supply line 204 of the on-board DC/DC converter.
  • the above detection circuit 202 can detect that the ground wire of the DC/DC converter 102 is disconnected and the contact is poor, causing the negative wire 204 or the shielding wire of the vehicle DC/DC converter to flow a large current, thereby avoiding continuous output of large current and causing the wiring harness to burn. , and to avoid electronic failures with high currents.
  • FIG. 3 is a schematic structural diagram of another vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application.
  • the detection circuit includes: a comparator, a first conductive branch, a second conductive branch, The third conductive branch.
  • the first conductive branch includes a resistor R1, a resistor R2 and a capacitor C1, wherein:
  • One end of the resistor R1 is connected to the external input voltage VREF, the other end of the resistor R1 is connected to the inverting input end of the comparator, one end of the resistor R2 and one end of the capacitor C1, the other end of the resistor R2 and the capacitor C1 are connected the other end is grounded.
  • the second conductive branch includes a resistor R3, a resistor R4 and a capacitor C2, wherein:
  • One end of the resistor R3 is connected to the external input voltage VREF, the other end of the resistor R3 is connected to one end of the resistor R4, the positive input end of the comparator and one end of the capacitor C2, the other end of the resistor R4 and the capacitor C2 The other end is connected to the negative power supply line of the vehicle DC/DC converter.
  • the third conductive branch includes a resistor R5, wherein:
  • One end of the resistor R5 is connected to the standby circuit of the on-board DC/DC converter and the ground, and the other end of the resistor R5 is connected to the negative line of the power supply of the on-board DC/DC converter.
  • the first conductive branch and the second conductive branch are connected to the external input voltage
  • the second conductive branch and the third conductive branch and the vehicle-mounted DC/DC converter Connect the negative wire of the power supply to the device.
  • the comparator in the above-mentioned vehicle-mounted DC/DC ground wire detection circuit may include a voltage comparator, which is not specifically limited here, wherein the forward input voltage of the comparator passes through the resistor R3 and the resistor R4 through the external input voltage.
  • the inverting input voltage of the comparator is provided by the external input voltage via the resistor R1 and the resistor R2.
  • FIG. 4 is a schematic structural diagram of another vehicle-mounted DC/DC ground wire detection circuit provided by an embodiment of the present application.
  • the vehicle-mounted DC/DC ground wire detection circuit includes: a DSP controller, a detection circuit, a vehicle-mounted DC/DC ground wire detection circuit DC/DC converter standby circuit, vehicle-mounted DC/DC converter power supply negative line, battery, vehicle frame and case, wherein,
  • the detection circuit includes a comparator, a first conductive branch, a second conductive branch, and a third conductive branch.
  • the above-mentioned DSP controller is connected to the port 7 of the comparator in the detection circuit, the second conductive branch of the detection circuit is connected to the external input voltage, and the third conductive branch of the detection circuit is standby with the vehicle-mounted DC/DC converter.
  • the circuit is connected, and the second conductive branch and the third conductive branch of the detection circuit are respectively connected with the negative power supply line of the vehicle-mounted DC/DC converter.
  • the casing and the frame are connected to the ground, so the connection with the casing or the frame is equivalent to grounding.
  • the standby circuit of the on-board DC/DC converter is connected to the positive electrode of the battery, and the second conductive branch and the third conductive branch of the detection circuit are connected to the negative electrode of the battery through the negative power supply line of the on-board DC/DC converter,
  • the negative pole of the battery is connected with the frame through the first ground wire, and the casing in the circuit is connected with the frame through the second ground wire.
  • the comparator includes a forward input terminal and a reverse input terminal, wherein the forward input terminal is connected to the second conductive branch, and the reverse input terminal is connected to the first conductive branch.
  • the first conductive branch includes a resistor R1, a resistor R2 and a capacitor C1, wherein:
  • One end of the resistor R1 is connected to the external input voltage VREF, the other end of the resistor R1 is connected to the inverting input end (port 6) of the comparator, one end of the resistor R2 and one end of the capacitor C1, and the other end of the resistor R2 is connected One end and the other end of the capacitor C1 are connected to the frame.
  • the second conductive branch includes a resistor R3, a resistor R4 and a capacitor C2, wherein:
  • One end of the resistor R3 is connected to the external input voltage VREF, the other end of the resistor R3 is connected to one end of the resistor R4, the positive input end (port 5) of the comparator and one end of the capacitor C2, the other end of the resistor R4 and The other end of the capacitor C2 is connected to the negative power supply line of the vehicle-mounted DC/DC converter.
  • the third conductive branch includes a resistor R5, wherein:
  • One end of the resistor R5 is connected to the standby circuit of the vehicle DC/DC converter and the chassis, and the other end of the resistor R5 is connected to the negative line of the vehicle DC/DC converter power supply.
  • the first conductive branch and the second conductive branch are connected to an external input voltage, and the second conductive branch is connected to the third conductive branch and the negative power supply line of the vehicle-mounted DC/DC converter.
  • the comparator in the above-mentioned vehicle-mounted DC/DC ground wire detection circuit may include a voltage comparator, which is not specifically limited here, wherein the forward input voltage of the comparator passes through the resistor R3 and the resistor R4 through the external input voltage.
  • the inverting input voltage of the comparator is provided by the external input voltage via the resistor R1 and the resistor R2.
  • the resistance value of the above-mentioned resistor R5 is at the milliohm level, so that the normal operation of the DC/DC standby circuit will not be affected, and the abnormal operation of the DC/DC standby circuit will not be caused.
  • the above-mentioned DSP control circuit is used to control the on or off of the standby circuit of the on-board DC/DC converter.
  • the DSP control circuit can directly control the DC/DC.
  • the converter is turned off, thus preventing the wiring harness in the circuit from burning out or burning out.
  • the DSP control circuit is also used to control the standby circuit of the on-board DC/DC converter to increase or decrease the output current.
  • the DSP will The controller can control the DC/DC converter to reduce the output current, so as to avoid continuously outputting excessive current and burning the wiring harness in the circuit.
  • the working principle of the on-board DC/DC ground wire detection circuit shown in FIG. 4 is: during normal operation, the power supply current of the on-board DC/DC converter standby circuit is very small, so that the on-board DC/DC converter is The voltage drop on the negative line of the power supply is also very low, which can be regarded as the same as the low level of the vehicle body.
  • the voltage of the inverting input terminal of the inverter is higher than the non-inverting input voltage, so that the comparator outputs a low level, and the negative power supply line of the vehicle DC/DC converter and the negative electrode of the battery are connected to the frame through the first ground wire.
  • the comparator When the ground wire is in poor contact or disconnected, a large current will be generated, and the negative wire of the on-board DC/DC converter will return to the on-board DC/DC standby circuit.
  • the resistor R5 When flowing through the resistor R5, due to the resistance of the resistor R5 If it is at the milliohm level, a large voltage drop can be generated, so that the voltage of the negative line of the vehicle DC/DC converter power supply is higher than that of the vehicle body or frame, and finally the non-inverting input voltage of the comparator is higher than that of the inverting input. voltage, the comparator outputs a high level to the DSP controller. At this time, the DSP controller controls the DC/DC converter to reduce the output current or turn off the DC/DC converter, so as to avoid continuously outputting a large current to burn the whole vehicle system. harness.
  • a detection circuit is connected between the DSP controller, the standby circuit of the on-board DC/DC converter, and the negative power supply line of the on-board DC/DC converter.
  • the above detection circuit can detect that the DC/DC converter standby circuit is grounded
  • the disconnection or poor contact leads to a large current flowing through the negative wire or shielding wire of the DC/DC power supply, so that the DSP controller controls the standby circuit of the on-board DC/DC converter to reduce the output current or controls the standby circuit of the on-board DC/DC converter to disconnect.
  • the above-mentioned high current may refer to the device in the circuit that consumes more current than normal, thereby avoiding the phenomenon of electronic failure of high current.
  • an embodiment of the present application provides an in-vehicle device, where the in-vehicle device includes the in-vehicle DC/DC ground wire detection circuit provided by any of the above application embodiments.
  • the vehicle-mounted DC/DC ground wire detection circuit in the vehicle-mounted device is the same as the vehicle-mounted DC/DC ground wire detection circuit described in any of the above application embodiments, and will not be described here.
  • the disclosed apparatus may be implemented in other manners.
  • the device embodiments described above are only illustrative.
  • the division of the above-mentioned units is only a logical function division.
  • multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical or other forms.
  • the units described above as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

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Abstract

一种车载DC/DC搭铁线检测电路，该电路包括DSP控制器（201）、检测电路（202）、车载DC/DC转换器待机电路（203）以及车载DC/DC转换器供电负线（204），所述检测电路（202）包括比较器、第一导电支路、第二导电支路、第三导电支路，如此，在DSP控制器（201）与车载DC/DC转换器待机电路（203）以及车载DC/DC转换器供电负线（204）之间接入检测电路（202），一旦由于DC/DC转换器（102）的搭铁线与车身接触不良甚至断开，或者，低压蓄电池（104）的搭铁线接触不良甚至断开，从而产生上百安培的电流时，该检测电路（202）能够检测到DC/DC转换器（102）搭铁线断开或者接触不良导致车载DC/DC转换器（102）供电负线流过大电流，或者，屏蔽线流过大电流，从而避免持续输出大电流而造成线束烧毁。

Description

车载DC/DC搭铁线检测电路 技术领域
本申请涉及电子电路技术领域，具体涉及一种车载DC/DC搭铁线检测电路。
背景技术
目前新能源汽车由于环保的需求已经越来越得到大众的认可，新能源车辆的使用也越来越普及。由于新能源车辆使用动力锂电池来驱动电机得到动力，因此由内燃机通过皮带驱动的直流发电机也不再使用，取而代之的是车载DC/DC转换器。
但由于整车低压电器的负载在1KW-3KW之间，因此车载DC/DC转换器也需要提供1KW-3KW的输出能力，输出电流在70A-200A之间。由于电流比较大，所需要的输出铜缆截面积也比较大，价格昂贵。为了节约成本，车载DC/DC转换器一般只有一根输出正极线连接到低压蓄电池。而车载DC/DC转换器的负极输出就直接就近使用一根搭铁线连接到车架，低压蓄电池也就近使用一根搭铁线连接到车架，车载DC/DC转换器的输出电流从正极通过输出线流到低压蓄电池，再经过低压蓄电池负极搭铁线、车身、DC/DC搭铁线流回车载DC/DC。
但是这种接线方式有一个副作用，车载DC/DC转换器需要低压蓄电池供电，它的待机电路有正负极输入，正极由车载控制器控制通断来控制DC/DC开启与否，待机电路负极输入则是通过连接到低压蓄电池的负极连接到车身，如果DC/DC的搭铁线与车身接触不好，或者低压蓄电池的搭铁线接触不好，阻抗偏大甚至于断开，就会导致上百安培的电流通过屏蔽层或者待机电路负线回流至DC/DC，最终会导致线束发热严重直至烧毁。
发明内容
本申请实施例提供一种车载DC/DC搭铁线检测电路，有利于检测到搭铁线的断开，避免持续输出过大电流而造成线束烧毁。
本申请实施例第一方面提供一种车载DC/DC搭铁线检测电路，包括：DSP控制器、检测电路、车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线，其中，
所述DSP控制器与所述检测电路连接，所述检测电路分别与所述车载DC/DC转换器待机电路以及所述车载DC/DC转换器供电负线连接；所述检测电路还与外部输入电压连接；
所述检测电路包括比较器、第一导电支路、第二导电支路、第三导电支路；所述比较器包括正向输入端与反向输入端，所述正向输入端与所述第二导电支路连接，所述反向输入端与所述第一导电支路连接。
在一个实施方式中，所述第一导电支路包括电阻R1、电阻R2以及电容C1，其中，
所述电阻R1的一端与所述外部输入电压连接，所述电阻R1的另一端与所述比较器的反向输入端、所述电阻R2的一端以及所述电容C1的一端连接，所述电阻R2的另一端以及所述电容C1的另一端接地。
在一个实施方式中，所述第二导电支路包括电阻R3、电阻R4以及电容C2，其中，
所述电阻R3的一端与所述外部输入电压连接，所述电阻R3的另一端与所述电阻R4的一端、所述比较器的所述正向输入端以及所述电容C2的一端连接，所述电阻R4的另一端以及所述电容C2的另一端与所述车载DC/DC转换器供电负线连接。
在一个实施方式中，所述第三导电支路包括电阻R5，其中：
所述电阻R5的一端与所述车载DC/DC转换器待机电路以及地连接，所述电阻R5的另一端与所述车载DC/DC转换器供电负线连接。
在一个实施方式中，所述电路还包括：
所述第一导电支路以及所述第二导电支路与所述外部输入电压连接，所述 第二导电支路与所述第三导电支路以及所述车载DC/DC转换器供电负线连接。
在一个实施方式中，所述比较器为电压比较器，其中，
所述比较器的正向输入电压通过所述外部输入电压经由所述电阻R3以及所述电阻R4提供，所述比较器的反向输入电压通过所述外部输入电压经由所述电阻R1以及所述电阻R2提供。
在一个实施方式中，所述DSP控制电路用于控制所述车载DC/DC转换器待机电路导通或者断开。
在一个实施方式中，所述DSP控制电路还用于控制所述车载DC/DC转换器待机电路提高或者降低输出电流。
本申请第二方面提供了一种车载设备，包括本申请实施例第一方面公开的车载DC/DC搭铁线检测电路。
在本申请实施例中，该车载DC/DC搭铁线检测电路包括DSP控制器、检测电路、车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线，DSP控制器与检测电路连接，检测电路分别与车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线连接；检测电路还与外部输入电压连接，检测电路包括比较器、第一导电支路、第二导电支路、第三导电支路，比较器包括正向输入端以及反向输入端，正向输入端与第二导电支路连接，反向输入端与第一导电支路连接；如此，在DSP控制器与车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线之间接入检测电路，一旦由于DC/DC转换器的搭铁线与车身接触不良甚至断开，或者，低压蓄电池的搭铁线接触不良甚至断开，从而产生上百安培的电流时，检测电路能够检测到DC/DC转换器搭铁线断开或者接触不良导致车载DC/DC转换器供电负线流过大电流的情况，从而，避免持续输出大电流而造成线束烧毁。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所涉及到的附图作简单地介绍。
图1是本申请实施例提供的一种车载DC/DC转换器搭铁线的接线电路的结构示意图；
图2是本申请实施例提供的一种车载DC/DC搭铁线检测电路的结构示意图；
图3是本申请实施例提供的另一种车载DC/DC搭铁线检测电路的结构示意图；
图4是本申请实施例提供的另一种车载DC/DC搭铁线检测电路的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请的一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、产品或设备固有的其他步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
为了更好的说明本申请实施例，在本申请实施例中的大电流可指电路中的电子元件比正常耗电流大，其范围已超出标准电流，是一种电子故障现象。
请参阅图1，为本申请实施例提供的一种车载DC/DC转换器搭铁线的接线电路的结构示意图，该接线电路可包括：动力电池101、车载DC/DC转换器102、整车控制器103以及蓄电池104，其中:
动力电池101通过高压电缆屏蔽层与车载DC/DC转换器102连接，车载DC/DC转换器102通过车载DC/DC转换器供电负线与蓄电池104的负极连接，车载DC/DC转换器102通过车载DC/DC转换器供电正线与整车控制器103连接，整车控制器103与蓄电池104的正极连接，蓄电池104的正极通过车载DC/DC正极输出线与车载DC/DC转换器102连接，蓄电池104的负极通过蓄电池搭铁线与车架或者车身连接，车载DC/DC转换器102通过DC/DC搭铁线与车架或者车身连接，高压电缆屏蔽层通过接地线与车架或者车身连接；高压屏蔽层与车架或者车身连接用于保持屏蔽效果，蓄电池104用于给车载DC/DC转换器102供电，整车控制器103用于控制车载DC/DC转换器102的通断情况。
可选地，图1所示的车载DC/DC转换器搭铁线的接线电路的工作原理如下：正常情况下，车载DC/DC转换器102通过一条DC/DC搭铁线与车架或者车身连接，蓄电池104通过一根蓄电池搭铁线连接到车架或者车身，车载DC/DC转换器102的输出电流从正极通过车载DC/DC正极输出线流到蓄电池104，再经过蓄电池搭铁线、车身或者车架、DC/DC搭铁线流回车载DC/DC转换器102。
在图1所示的接线电路中，车载DC/DC转换器102需要蓄电池104供电，同时，车载DC/DC转换器102内部有待机电路，该待机电路有正负极输入，正极由整车控制器103控制通断来控制车载DC/DC转换器102开启或者关闭，车载DC/DC转换器102中的待机电路的负极输入则是通过连接到蓄电池104的负极从而连接到车身，在非正常情况下，如果DC/DC搭铁线与车身或者车架接触不好，或者蓄电池104的蓄电池搭铁线接触不良，则可造成蓄电池搭铁线的阻抗偏大甚至于断开，最后，可导致上百安培的电流通过高压电缆屏蔽层或者车载DC/DC转换器102中的待机电路的负线回流至车载DC/DC转换器102，导致线束发热严重直至烧毁。
下面结合附图对本申请实施例进行详细介绍。
请参阅图2，图2是本申请实施例提供的一种车载DC/DC搭铁线检测电路的结构示意图，该车载DC/DC搭铁线检测电路包括：DSP控制器201、检测电路202、车载DC/DC转换器待机电路203以及车载DC/DC转换器供电负线204，其中：
DSP控制器201与检测电路202连接，检测电路202分别与车载DC/DC转换器待机电路203以及车载DC/DC转换器供电负线204连接，该检测电路202还与外部输入电压连接。
此外，DSP控制器201可用于控制车载DC/DC转换器待机电路203提高或者降低输出电流以及控制车载DC/DC转换器待机电路203的导通或者断开的状态，检测电路202可用于检测车载DC/DC转换器待机电路203的工作情况，举例来说，检测电路202可用于检测车载DC/DC转换器待机电路203中的搭铁线断开或者接触不良的情况。
可选地，图2所示的车载DC/DC搭铁线检测电路的结构示意图可检测出如图1所示的与车载DC/DC转换器102连接的搭铁线的接线电路的非正常情况，例如，搭铁线断开或者接触不良等情况，具体地，本申请实施例可在DSP控制器201与车载DC/DC转换器待机电路203以及车载DC/DC转换器供电负线204之间接入检测电路202，一旦由于DC/DC转换器102的搭铁线与车身接触不良甚至断开，或者，蓄电池的搭铁线接触不良甚至断开，从而产生上百安培的电流时，上述检测电路202能够检测到DC/DC转换器102搭铁线断开、接触不良导致车载DC/DC转换器供电负线204或者屏蔽线流过大电流的情况，从而，避免持续输出大电流而造成线束烧毁，以及避免出现大电流的电子故障现象。
请参阅图3，图3是本申请实施例提供的另一种车载DC/DC搭铁线检测电路的结构示意图，该检测电路包括：比较器、第一导电支路、第二导电支路、第三导电支路。
可选地，第一导电支路包括电阻R1、电阻R2以及电容C1，其中：
电阻R1的一端与外部输入电压VREF连接，电阻R1的另一端与所述比较器的反向输入端、所述电阻R2的一端以及所述电容C1的一端连接，电阻R2的另 一端以及电容C1的另一端接地。
可选地，第二导电支路包括电阻R3、电阻R4以及电容C2，其中：
电阻R3的一端与外部输入电压VREF连接，电阻R3的另一端与电阻R4的一端、比较器的正向输入端以及所述电容C2的一端连接，所述电阻R4的另一端以及所述电容C2的另一端与所述车载DC/DC转换器供电负线连接。
可选地，第三导电支路包括电阻R5，其中：
电阻R5的一端与车载DC/DC转换器待机电路以及地连接，电阻R5的另一端与车载DC/DC转换器供电负线连接。
可选地，所述第一导电支路以及所述第二导电支路与所述外部输入电压连接，所述第二导电支路与所述第三导电支路以及所述车载DC/DC转换器供电负线连接。
可选地，上述车载DC/DC搭铁线检测电路中的比较器可包括电压比较器，具体的在此不作限定，其中，比较器的正向输入电压通过外部输入电压经由电阻R3以及电阻R4提供，该比较器的反向输入电压通过外部输入电压经由电阻R1以及电阻R2提供。
请参阅图4，图4是本申请实施例提供的另一种车载DC/DC搭铁线检测电路的结构示意图，该车载DC/DC搭铁线检测电路包括：DSP控制器、检测电路、车载DC/DC转换器待机电路、车载DC/DC转换器供电负线、蓄电池、车架以及机壳，其中，
检测电路包括比较器、第一导电支路、第二导电支路、第三导电支路。
可选地，上述DSP控制器与检测电路中的比较器的端口7连接，检测电路的第二导电支路与外部输入电压连接，检测电路的第三导电支路与车载DC/DC转换器待机电路连接，检测电路的第二导电支路以及第三导电支路分别与车载DC/DC转换器供电负线连接，整个上述检测电路可通过第二搭铁线与机壳以及车架连接，在本申请实施例中，由于在整车系统中，机壳与车架与地面相连接，如此，与机壳或者车架连接相当于接地。
可选地，上述车载DC/DC转换器待机电路与蓄电池的正极连接，上述检测 电路的第二导电支路以及第三导电支路通过车载DC/DC转换器供电负线与蓄电池的负极连接，蓄电池的负极与车架通过第一搭铁线连接，电路中的机壳通过第二搭铁线与车架连接。
上述比较器包括正向输入端与反向输入端，其中，正向输入端与第二导电支路连接，反向输入端与第一导电支路连接。
可选地，第一导电支路包括电阻R1、电阻R2以及电容C1，其中：
电阻R1的一端与外部输入电压VREF连接，电阻R1的另一端与所述比较器的反向输入端(端口6)、所述电阻R2的一端以及所述电容C1的一端连接，电阻R2的另一端以及电容C1的另一端接车架。
可选地，第二导电支路包括电阻R3、电阻R4以及电容C2，其中：
电阻R3的一端与外部输入电压VREF连接，电阻R3的另一端与电阻R4的一端、比较器的正向输入端(端口5)以及所述电容C2的一端连接，所述电阻R4的另一端以及所述电容C2的另一端与所述车载DC/DC转换器供电负线连接。
可选地，第三导电支路包括电阻R5，其中：
电阻R5的一端与车载DC/DC转换器待机电路以及机壳连接，电阻R5的另一端与车载DC/DC转换器供电负线连接。
可选地，第一导电支路以及第二导电支路与外部输入电压连接，第二导电支路与第三导电支路以及车载DC/DC转换器供电负线连接。
可选地，上述车载DC/DC搭铁线检测电路中的比较器可包括电压比较器，具体的在此不作限定，其中，比较器的正向输入电压通过外部输入电压经由电阻R3以及电阻R4提供，该比较器的反向输入电压通过外部输入电压经由电阻R1以及电阻R2提供。
可选地，上述电阻R5的阻值为毫欧级别，如此，不会影响DC/DC待机电路的正常工作，不会导致DC/DC待机电路工作异常。
可选地，上述DSP控制电路用于控制所述车载DC/DC转换器待机电路的导通或断开，如此，如果检测到DC/DC搭铁线异常，DSP控制电路可直接控制DC/DC转换器关闭，从而避免电路中的线束烧坏或者烧毁。
可选地，DSP控制电路还用于控制车载DC/DC转换器待机电路提高或者降 低输出电流，如此，如果检测到DC/DC搭铁线或者高压电缆屏蔽层流过的电流过大电流，DSP控制器可控制DC/DC转换器降低输出电流，避免持续输出过大电流以至于烧毁电路中的线束。
可选地，图4所示的车载DC/DC搭铁线检测电路的工作原理是：正常工作时，车载DC/DC转换器待机电路的供电电流很小，从而使得在车载DC/DC转换器供电负线上的压降也很低，可以看成与车身低电平相同，在本申请实施例中，可通过电阻R1、电阻R2、电阻R3以及电阻R4的阻值的设定，使比较器的反相输入端电压比正相输入电压高，从而使得比较器输出低电平，车载DC/DC转换器供电负线与蓄电池的负极通过第一搭铁线与车架连接，如果第一搭铁线接触不良或者断开时，会产生较大的电流，并通过车载DC/DC转换器供电负线回流至车载DC/DC待机电路，在流经电阻R5时，由于电阻R5的阻值为毫欧级别的，则可产生一个较大的压降，从而使得车载DC/DC转换器供电负线的电压高出车身或者车架，最终使得比较器的正相输入电压高过反相输入电压，比较器输出高电平至DSP控制器，此时DSP控制器则控制DC/DC转换器降低输出电流或者关掉DC/DC转换器，从而，避免持续输出大电流烧毁整车系统中的线束。
可以看出，本申请实施例在DSP控制器与车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线之间接入检测电路，一旦由于与车载DC/DC转换器供电负线连接的搭铁线与车身接触不良甚至断开，或者，低压蓄电池的搭铁线接触不良甚至断开，从而产生上百安培的电流时，上述检测电路能够检测到DC/DC转换器待机电路搭铁线断开或者接触不良导致DC/DC供电负线或者屏蔽线流过大电流，从而通过DSP控制器控制车载DC/DC转换器待机电路降低输出电流或者控制车载DC/DC转换器待机电路断开，上述大电流可指电路中的器件比正常耗电流大，从而可避免出现大电流的电子故障现象。
在一个可能的示例中，本申请实施例提供一种车载设备，该车载设备包括上述任一申请实施例提供的车载DC/DC搭铁线检测电路。其中，车载设备中的车载DC/DC搭铁线检测电路与上述任一申请实施例中描述的车载DC/DC搭铁线检测电路相同，在此不再叙述。
需要说明的是，对于前述的各申请实施例，为了简单描述，故将其都表述 为一系列的动作组合，但是本领域技术人员应该知悉，本申请并不受所描述的动作顺序的限制，因为依据本申请，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本申请所必须的。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置，可通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如上述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性或其它的形式。
上述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上上述，本说明书内容不应理解为对本申请的限制。

Claims (10)

  1. 一种车载DC/DC搭铁线检测电路，其特征在于，所述搭铁线检测电路包括DSP控制器、检测电路、车载DC/DC转换器待机电路以及车载DC/DC转换器供电负线，其中，
    所述DSP控制器与所述检测电路连接，所述检测电路分别与所述车载DC/DC转换器待机电路以及所述车载DC/DC转换器供电负线连接；所述检测电路还与外部输入电压连接；
    所述检测电路包括比较器、第一导电支路、第二导电支路、第三导电支路；
    所述比较器包括正向输入端以及反向输入端，所述正向输入端与所述第二导电支路连接，所述反向输入端与所述第一导电支路连接。
  2. 根据权利要求1所述的车载DC/DC搭铁线检测电路，其特征在于，所述第一导电支路包括电阻R1、电阻R2以及电容C1，其中，
    所述电阻R1的一端与所述外部输入电压连接，所述电阻R1的另一端与所述比较器的反向输入端、所述电阻R2的一端以及所述电容C1的一端连接，所述电阻R2的另一端以及所述电容C1的另一端接地。
  3. 根据权利要求1所述的车载DC/DC搭铁线检测电路，其特征在于，所述第二导电支路包括电阻R3、电阻R4以及电容C2，其中，
    所述电阻R3的一端与所述外部输入电压连接，所述电阻R3的另一端与所述电阻R4的一端、所述比较器的所述正向输入端以及所述电容C2的一端连接，所述电阻R4的另一端以及所述电容C2的另一端与所述车载DC/DC转换器供电负线连接。
  4. 根据权利要求1所述的车载DC/DC搭铁线检测电路，其特征在于，所述第三导电支路包括电阻R5，其中：
    所述电阻R5的一端与所述车载DC/DC转换器待机电路以及机壳连接，所述电阻R5的另一端与所述车载DC/DC转换器供电负线连接。
  5. 根据权利要求1-4任一项所述的车载DC/DC搭铁线检测电路，其特征在于，所述电路还包括：
    所述第一导电支路以及所述第二导电支路与所述外部输入电压连接，所述第二导电支路与所述第三导电支路以及所述车载DC/DC转换器供电负线连接。
  6. 根据权利要求1-3任一项所述的车载DC/DC搭铁线检测电路，其特征在于，所述比较器为电压比较器，其中，
    所述比较器的正向输入电压通过所述外部输入电压经由所述电阻R3以及所述电阻R4提供，所述比较器的反向输入电压通过所述外部输入电压经由所述电阻R1以及所述电阻R2提供。
  7. 根据权利要求4所述的车载DC/DC搭铁线检测电路，其特征在于，所述电阻R5的阻值为毫欧级别。
  8. 根据权利要求1所述的车载DC/DC搭铁线检测电路，其特征在于，所述DSP控制电路用于控制所述车载DC/DC转换器待机电路导通或者断开。
  9. 根据权利要求8所述的车载DC/DC搭铁线检测电路，其特征在于，所述DSP控制电路还用于控制所述车载DC/DC转换器待机电路提高或者降低输出电流。
  10. 一种车载设备，其特征在于，所述车载设备包括如权利要求1-9任一项所述的车载DC/DC搭铁线检测电路。
PCT/CN2020/101311 2020-07-10 2020-07-10 车载dc/dc搭铁线检测电路 WO2022006845A1 (zh)

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