WO2022056919A1 - Charging signal detection circuit and vehicle-mounted device - Google Patents

Charging signal detection circuit and vehicle-mounted device Download PDF

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Publication number
WO2022056919A1
WO2022056919A1 PCT/CN2020/116553 CN2020116553W WO2022056919A1 WO 2022056919 A1 WO2022056919 A1 WO 2022056919A1 CN 2020116553 W CN2020116553 W CN 2020116553W WO 2022056919 A1 WO2022056919 A1 WO 2022056919A1
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WO
WIPO (PCT)
Prior art keywords
network module
resistor
constant current
current source
charging
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PCT/CN2020/116553
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French (fr)
Chinese (zh)
Inventor
刘鹏飞
胡定高
唐弘扬
王俊
吴壬华
Original Assignee
深圳欣锐科技股份有限公司
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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 CN202080015912.XA priority Critical patent/CN114007897B/en
Priority to PCT/CN2020/116553 priority patent/WO2022056919A1/en
Publication of WO2022056919A1 publication Critical patent/WO2022056919A1/en

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    • 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
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • 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
    • G01R19/10—Measuring sum, difference or ratio
    • 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
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • 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
    • G01R31/40—Testing power supplies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Definitions

  • the present application relates to the technical field of electric vehicles, in particular to a charging signal detection circuit and a vehicle-mounted device.
  • the low-voltage ground is the body.
  • the grounds of each electrical equipment and the charging equipment are connected to the body of the electric vehicle.
  • the body of the electric vehicle is passing current.
  • the ground of each device is connected to different positions of the body of the electric vehicle, and the ground of each device is not at the same potential.
  • the body ground offset is formed, and the detection of the charging signal is carried out.
  • the charging signal is detected, the influence of the ground offset of the vehicle body is not excluded, resulting in inaccurate detection of the charging signal, and thus the safety of the charging process cannot be guaranteed.
  • the present application provides a charging signal detection circuit and a vehicle-mounted device, which are used to improve the accuracy of charging signal detection.
  • the present application provides a charging signal detection circuit, which is applied to an electric vehicle, and includes a power supply, a first network module, a second network module, a switching module, and a micro-control unit, wherein,
  • the positive pole of the power supply is respectively connected to the first end of the first network module and the first end of the second network module, the second end of the first network module is connected to the first end of the switching module, so The second end of the second network module is connected to the second end of the switching module, the third end of the switching module is connected to the first end of the micro-control unit, and the second end of the micro-control unit is connected to the the first position of the body of the electric vehicle, and the negative pole of the power source is connected to the second position of the body of the electric vehicle;
  • the charging device When charging the electric vehicle through the charging device, the first end of the charging device is connected to the third position of the body of the electric vehicle, and the second end of the charging device is connected to the third end of the switching module,
  • the charging device includes a charging protection resistor
  • the micro-control unit is configured to control the switching module to select and turn on the first network module and/or the second network module during the charging process of the electric vehicle through the charging device, wherein the first network module and/or the second network module are A network module is different from the second network module, and is used for detecting the voltage value of the third terminal of the switching module, and for calculating the offset value of the vehicle body according to the voltage value, and according to the offset value of the vehicle body The value is corrected to obtain an accurate charging signal, and the offset value of the vehicle body is the potential difference value between the third position and the first position.
  • the first network module includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module
  • the second network module includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module.
  • the first constant current source network module includes a voltage stabilizing device and a first resistor, wherein the first pin of the voltage stabilizing device is connected to the positive pole of the power supply, and the first pin of the voltage stabilizing device is connected to the positive pole of the power supply. Two pins are connected to the first end of the first resistor, and the third pin of the voltage regulator device is respectively connected to the second end of the first resistor and the switching module.
  • the second constant current source network module includes a first resistor, a triode, a voltage stabilizing device and a second resistor, and a first end of the first resistor and a negative electrode of the voltage stabilizing device are connected to the The positive pole of the power supply, the second end of the first resistor is connected to the emitter of the triode, the positive pole of the voltage stabilizing device is respectively connected to the base of the triode and the first end of the second resistor, the The second end of the two resistors is grounded, and the collector of the triode is connected to the switching module.
  • the third constant current source network module includes: a capacitor, a first resistor, a second resistor, a one-way conduction device, a first transistor, a second transistor, a voltage regulator, and a third A resistor, wherein the positive electrode of the capacitor, the first end of the first resistor and the first end of the second resistor are connected to the positive electrode of the power supply, and the negative electrode of the capacitor is respectively connected to the first triode
  • the second end is connected to the positive electrode of the one-way conduction device, and the negative electrode of the one-way conduction device is connected to the base electrode of the first triode and the collector of the second triode, respectively.
  • the emitter of the pole tube is connected to the first end of the third resistor, and the second end of the third resistor and the positive electrode of the voltage regulator device are connected to the switching module.
  • the one-way conducting device comprises a diode.
  • the fourth constant current source network module includes a voltage stabilizing device, a first resistor, an amplifier, a triode and a second resistor, wherein the negative electrode of the voltage stabilizing device is connected to the positive electrode of the power supply, and the The positive pole of the voltage regulator is respectively connected to the first end of the first resistor and the first end of the amplifier, the second end of the first resistor is grounded, and the second end of the amplifier is respectively connected to the second resistor The first end of the amplifier and the emitter of the triode, the second end of the second resistor is connected to the positive electrode of the power supply, the third end of the amplifier is connected to the base of the triode, and the collector of the triode is connected the switching module.
  • the voltage stabilizing device includes a zener diode.
  • the present application provides an in-vehicle device, where the in-vehicle device includes the charging signal detection circuit according to any embodiment of the first aspect.
  • the charging signal detection circuit applied to electric vehicles, includes a power supply, a first network module, a second network module, a switching module and a micro-control unit, wherein the positive pole of the power supply is connected to the first network module respectively.
  • the three ends are connected to the first end of the micro-control unit, the second end of the micro-control unit is connected to the first position of the body of the electric vehicle, and the negative pole of the power supply is connected to the second position of the body of the electric vehicle; when charging the electric vehicle through the charging device , the first end of the charging device is connected to the third position of the body of the electric vehicle, the second end of the charging device is connected to the third end of the switching module, and the charging device includes a charging protection resistor;
  • the switching module is controlled to selectively turn on the first network module and/or the second network module, wherein the first network module is different from the second network module, and is used for detecting the voltage value of the third terminal of the switching module, and for detecting
  • the offset value of the vehicle body is calculated from the voltage value, and an accurate charging signal is obtained by correcting the offset value of the vehicle body.
  • the offset value of the vehicle body is the potential difference between the first position and the third position. It can be seen that in the process of charging the electric vehicle through the charging device, the charging signal detection circuit can selectively conduct between different network modules to detect the voltage value of the second end of the charging device when it is connected to different network modules, and The offset value of the vehicle body is determined according to the voltage when different network modules are connected, so that the detected voltage value can be compensated according to the offset value of the vehicle body to obtain the actual voltage value of the charging device, and then according to the actual voltage value The detected charging signal is corrected, which improves the accuracy of charging signal detection and ensures the stability and safety of the electric vehicle charging process.
  • FIG. 1 is a schematic diagram of an application scenario of a charging signal detection circuit provided by the present application
  • FIG. 2 is a schematic structural diagram of a first constant current source network module provided by the present application.
  • FIG. 3 is a schematic structural diagram of a second constant current source network module provided by the present application.
  • FIG. 4 is a schematic structural diagram of a third constant current source network module provided by the present application.
  • FIG. 5 is a schematic structural diagram of a fourth constant current source network module provided by the present application.
  • the charging signal detection circuit 110 includes a power supply 1101 , a first network module 1102 , and a second network module 1103, the switching module SW and the micro-control unit 1104, wherein the positive pole of the power supply 1101 is respectively connected to the first end of the first network module 1102 and the first end of the second network module 1103, the first network
  • the second end of the module 1102 is connected to the first end of the switching module SW
  • the second end of the second network module 1103 is connected to the second end of the switching module SW
  • the third end of the switching module SW is connected to the
  • the first end of the micro-control unit 1104 and the second end of the micro-control unit 1104 are connected to the first position A of the body 120 of the electric vehicle
  • the negative electrode of the power supply 1101 is connected to the second position of the body 120 of the electric vehicle B;
  • the charging device 100 When charging the electric vehicle through the charging device 100, the first end of the charging device 100 is connected to the third position C of the body 120 of the electric vehicle, and the second end of the charging device 100 is connected to the electric vehicle the third end of the switching module SW, the charging device 100 includes a charging protection resistor RC;
  • the micro-control unit 1104 is configured to control the switching module SW to select and turn on the first network module 1102 and/or the second network module 1103 during the charging process of the electric vehicle through the charging device 100 ,
  • the first network module 1102 is different from the second network module 1103, and is used for detecting the voltage value of the third terminal of the switching module SW, and for calculating the offset value of the vehicle body according to the voltage value,
  • An accurate charging signal is obtained by correcting the offset value of the vehicle body, where the offset value of the vehicle body is the potential difference between the third position C and the first position A.
  • the voltage value of the third terminal of the switching module SW is the potential difference between the second terminal of the charging device 100 and the first position A.
  • the first network module 1102 includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module.
  • the second network module 1103 includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module, and a fourth constant current source network module. That is, the above-mentioned first network module 1102 and the above-mentioned second network module 1103 are both constant-current source network modules, but the circuit parameters of the first network module 1102 and the second network module 1103 are different, that is, the first network module 1102 and the second network module. The total resistance and voltage provided by the 1103 are different.
  • the constant current source module refers to a current source module whose output current is kept constant and satisfies the sampling data obtained by the micro-control unit 1104 when different constant current source network modules are connected (including the voltage at the third end of the switching module SW and the constant outflow constant current) The data value of the current of the current source network module) is different.
  • the first network module 1102 and the second network module 1103 may be constant current source network modules with the same structure and different parameters.
  • the first network module 1102 and the second network module 1103 are constant current source network modules with the same structure and only different resistance values of the corresponding total resistance, so that when connecting different constant current source network modules, the micro-control unit 1104 The data values of the acquired sample data are different.
  • the first network module 1102 may be any one of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module.
  • the first network module 1102 may also be a constant current obtained by connecting at least two of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module in parallel.
  • the second network module 1103 can be any of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module
  • the second network module 1103 can also be at least two of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module in parallel The constant current source network module obtained after.
  • the low-voltage ground in the entire vehicle system is the body 120 of the electric vehicle, and the charging device 100 and the charging signal detection circuit 110 are both connected to the electric vehicle.
  • the body 120 of the car is connected, and the body 120 of the electric car will have a certain impedance when passing current, so that the ground of the charging device 100 and the ground of the charging signal detection circuit 110 are not connected to different positions of the body 120 of the electric car.
  • the charging signal detection circuit 110 is connected to the first position A of the body 120 of the electric vehicle through the second end of the micro-control unit 1104, and the charging device 100 is connected to the third position C of the body 120 of the electric vehicle.
  • the voltage value of the third terminal of the switching module SW detected by the micro-control unit 1104 is the potential difference between the third terminal of the switching module SW and the first position A, not the potential difference between the two ends of the charging device 100, that is, the voltage value of the switching module SW.
  • the voltage value of the third terminal is the sum of the potential difference between the second terminal and the first terminal of the charging device 100 and the potential difference between the third position C and the first position A, wherein the third position C and the first position
  • the potential difference between A is the ground offset value of the vehicle body in the embodiment of the present application.
  • step 1 the process of determining the offset value of the vehicle body through the charging signal detection system 10 will be specifically introduced, including step 1 and step 2 .
  • Step 1 when charging the electric vehicle through the charging device 100, the charging signal detection system 10 performs any one of the following operations: First, when the micro-control unit 1104 controls the switching module SW to turn on the first network module 1102 , the voltage value V 1 of the third end of the switching module SW is detected by the micro-control unit 1104 and the current value I 1 of the third end of the switching module SW is determined by the micro-control unit 1104, and the micro-control unit 1104 controls the switching module SW to turn on the first When there are two network modules 1103, the micro-control unit 1104 detects the voltage value V 2 of the third terminal of the switching module SW and determines the current value I 2 of the third terminal of the switching module SW by the micro-control unit 1104; When the unit 1104 turns on the first network module 1102, the micro-control unit 1104 detects the voltage value V 1 of the third terminal of the switching module SW and determines the current value I 1 of the third terminal of the switching module SW through the micro-control unit 1104.
  • the control unit 1104 When the control unit 1104 turns on the first network module 1102 and the second network module 1103, the control unit 1104 detects the voltage value V 2 of the third terminal of the switching module SW and determines the current value of the third terminal of the switching module SW through the micro-control unit 1104 I 2 ; the third type, when the second network module 1103 is turned on by the micro control unit 1104, the voltage value V 1 of the third end of the switching module SW is detected by the micro control unit 1104 and the voltage value V 1 of the switching module SW is determined by the micro control unit 1104 The current value I 1 of the third terminal, when the first network module 1102 and the second network module 1103 are turned on by the micro control unit 1104 , the voltage value V 2 of the third terminal of the switching module SW is detected by the micro control unit 1104 and the voltage value V 2 of the third terminal of the switching module SW is detected by the micro control unit 1104 The unit 1104 determines the current value I 2 of the third terminal of the switching module SW;
  • controlling the switching module SW to turn on the first network module 1102 and the second network module 1103 through the micro-control unit 1104 refers to controlling the switching module SW to turn on the first network module 1102 and the second network module 1103 through the micro-control unit 1104 at the same time.
  • the second network module 1103 is substantially connected to the charging signal detection circuit 110 after connecting the first network module 1102 and the second network module 1103 in parallel.
  • first network module 1102 and the second network module 1103 are both constant-current source network modules, and only the first network module 1102 will be connected when the first network module 1102 and the second network module 1103 are determined. , only the second network module 1103 is turned on, and the first network module 1102 and the second network module 1103 are turned on at the same time.
  • the current value corresponding to the current flowing through the charging device 100 is stored in the micro-control unit 1104 in advance, then The micro-control unit 1104 may determine the current value of the corresponding output current according to the connection state of the network module.
  • Step 2 according to the voltage value V 1 , the current value I 1 , the voltage value V 2 and the current value I 2 , determine the resistance value RC of the charging protection resistor RC and the vehicle body ground offset value V p ;
  • V 1 RC * I 1 +V p
  • V 2 RC *I 2 + V p
  • the resistance value RC of the charging protection resistor RC and the offset value V p of the vehicle body can be obtained.
  • the charging signal detection circuit 110 can selectively conduct between different network modules to detect that the second end of the charging device 100 is connected to different The voltage value when the network module is used, and the offset value of the vehicle body is determined according to the voltage value when different network modules are connected, so that the detected voltage value can be compensated according to the offset value of the vehicle body to obtain the second terminal and the charging device 100.
  • the actual voltage value between the first terminals, and then the detected charging signal is corrected according to the actual voltage value, which improves the accuracy of the charging signal detection and ensures the stability and safety of the electric vehicle charging process.
  • FIG. 2 is a schematic structural diagram of the first constant current source network module involved in the present application.
  • the first constant current source network module includes: a voltage stabilizing device and a first resistor R1, wherein, The second pin of the voltage regulator device is connected to the first end of the first resistor R1, and the third pin of the voltage regulator device is connected to the second end of the first resistor R1.
  • the first constant current source network module is connected to the first end or the second end of the switching module SW through the third pin of the voltage regulator device, and the power supply is connected to the power supply through the first pin of the voltage regulator device The positive pole of the 1101.
  • the first pin of the voltage regulator device is a voltage regulation pin; the second pin is a voltage output pin; the third pin is a voltage input pin, and the voltage regulator device can be an LM317 chip.
  • the current Iout output by the first constant current source network module is the current flowing through the charging protection resistor RC, and the corresponding relationship with the resistance value R1 of the first resistor R1 is:
  • V ret is the voltage value across the first resistor R 1
  • I Adj is the current value of the current output by the first pin
  • 1.25V is the difference between the first pin and the second pin is the voltage reference.
  • the current flowing out of the first constant current source network module is constant.
  • the above-mentioned charging signal detection circuit 110 can provide a constant current power supply by connecting to the first constant current source network module.
  • FIG. 3 is a schematic structural diagram of the second constant current source network module involved in the present application.
  • the second constant current source network module includes a first resistor R1 , a transistor, a voltage stabilizing device and a second constant current source network module.
  • Two resistors R2 the second end of the first resistor R1 is connected to the emitter of the triode, the positive electrode of the voltage stabilizing device is connected to the base of the triode and the first end of the second resistor R2 respectively, so The second end of the second resistor R2 is grounded.
  • the second constant current source network module is connected to the positive electrode of the power supply 1101 through the first end of the first resistor R1 and the negative electrode of the voltage regulator device, and is connected to the switching module SW through the collector of the triode. the first end or the second end.
  • the voltage-stabilizing device may be a voltage-stabilizing diode.
  • the current flowing out of the second constant current source network module is constant.
  • the above-mentioned charging signal detection circuit 110 can provide a constant current power supply by connecting to the second constant current source network module.
  • FIG. 4 is a schematic structural diagram of a third constant current source network module involved in the present application.
  • the third constant current source network module includes a capacitor, a first resistor R1, a second resistor R2, The unidirectional conduction device, the first triode VT1, the second triode VT2, the voltage regulator device and the third resistor R3, wherein the negative electrode of the capacitor is respectively connected to the collector of the first triode VT1, the The base of the second triode VT2 and the negative electrode of the voltage regulator device, the second end of the first resistor R1 is connected to the emitter of the first triode VT1, and the second end of the second resistor R2 is connected to the emitter of the first triode VT1.
  • the two terminals are connected to the positive pole of the one-way conduction device, and the negative pole of the one-way conduction device is connected to the base of the first transistor VT1 and the collector of the second transistor VT2 respectively.
  • the emitter of the transistor VT2 is connected to the first end of the third resistor R3.
  • the third constant current source network module is connected to the first end or the second end of the switching module SW through the second end of the third resistor R3 and the positive electrode of the voltage regulator device, and the positive electrode of the capacitor is connected to the first end or the second end of the switching module SW.
  • the first end of the first resistor R1 and the first end of the second resistor R2 are connected to the positive electrode of the power supply 1101 .
  • the voltage-stabilizing device may be a voltage-stabilizing diode.
  • the unidirectional conduction device may be a diode.
  • the resistance value R1 of a resistor R1 is determined, the current flowing out of the third constant current source network module is constant.
  • the above-mentioned charging signal detection circuit 110 provides a constant current power supply by connecting to the third constant current source network module.
  • FIG. 5 is a schematic structural diagram of the fourth constant current source network module involved in the present application.
  • the fourth constant current source network module includes: a voltage stabilizing device, a first resistor R1, an amplifier , a triode and a second resistor R2, wherein the positive electrode of the voltage stabilizing device is connected to the first end of the first resistor R1 and the first end of the amplifier respectively, and the second end of the first resistor R1 is grounded,
  • the second end of the amplifier is respectively connected to the first end of the second resistor R2 and the emitter of the triode, the second end of the second resistor R2 is connected to the positive electrode of the power supply 1101, and the first end of the amplifier is connected.
  • the three terminals are connected to the base of the triode.
  • the fourth constant current source network module is connected to the positive pole of the power supply 1101 through the negative pole of the voltage regulator and the second end of the second resistor R2, and is connected to the switching module SW through the collector of the triode the first or second end.
  • the voltage-stabilizing device may be a voltage-stabilizing diode.
  • the resistance value of the first resistor R1 when the resistance value of the first resistor R1 is constant, the voltage of the positive electrode of the voltage stabilizing device, the first end of the first resistor R1 and the first end of the amplifier are constant. At this time, the second resistor The voltage drop across R2 is constant, the current flowing through the second resistor R2 is constant, and finally, the current flowing out of the fourth constant current source network module is constant.
  • the above-mentioned charging signal detection circuit 110 provides a constant current power supply by connecting to the fourth constant current source network module.
  • the first network module 1102 is the first constant current source network module shown in FIG. 2
  • the second network module 1103 is the one shown in FIG. 3 .
  • the second constant current source network module is the first constant current source network module.
  • the charging signal detection circuit 110 selects to access the first constant current source network module and/or the second constant current source network by setting the first constant current source network module and the second constant current source network module.
  • different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the first network module 1102 is the third constant current source network module shown in FIG. 4
  • the second network module 1103 is shown in FIG. 5 .
  • the fourth constant current source network module is the third constant current source network module.
  • the charging signal detection circuit 110 selects and accesses the third constant current source network module and/or the fourth constant current source network by setting the third constant current source network module and the fourth constant current source network module.
  • different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the first network module 1102 is the first constant current source network module shown in FIG. 2
  • the second network module 1103 is the one shown in FIG. 4 .
  • the charging signal detection circuit 110 selects to access the first constant current source network module and/or the third constant current source network by setting the first constant current source network module and the third constant current source network module.
  • different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the first network module 1102 is the first constant current source network module shown in FIG. 2
  • the second network module 1103 is the one shown in FIG. 5 .
  • the charging signal detection circuit 110 selects to access the first constant current source network module and/or the fourth constant current source network by setting the first constant current source network module and the fourth constant current source network module.
  • different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the first network module 1102 is the second constant current source network module shown in FIG. 3
  • the second network module 1103 is the second network module shown in FIG. 4 .
  • the third constant current source network module is the third constant current source network module.
  • the charging signal detection circuit 110 selects and accesses the second constant current source network module and/or the third constant current source network by setting the second constant current source network module and the third constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the first network module 1102 is the second constant current source network module shown in FIG. 3
  • the second network module 1103 is the second network module shown in FIG. 5 .
  • the fourth constant current source network module is the first network module 1102 .
  • the charging signal detection circuit 110 selects and accesses the second constant current source network module and/or the fourth constant current source network by setting the second constant current source network module and the fourth constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
  • the present application also provides an in-vehicle device, wherein the in-vehicle device includes any of the charging signal detection circuits described in the above embodiments.

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Abstract

A charging signal detection circuit (110) and a vehicle-mounted device. The charging signal detection circuit (110) comprises a power supply (1101), a first network module (1102), a second network module (1103), a switching module (SW), and a micro-control unit; the positive electrode of the power supply (1101) is separately connected to a first end of the first network module (1102) and a first end of the second network module (1103); a second end of the first network module (1102) is connected to a first end of the switching module (SW); a second end of the second network module (1103) is connected to a second end of the switching module (SW); a third end of the switching module (SW) is connected to a first end of the micro-control unit; a second end of the micro-control unit is connected to a first position (A) of a body (120) of an electric vehicle; the negative electrode of the power supply (1101) is connected to a second position (B) of the body (120) of the electric vehicle; when the electric vehicle is charged by a charging device (100), a first end of the charging device (100) is connected to a third position (C) of the body (120) of the electric vehicle, and a second end of the charging device (100) is connected to the third end of the switching module (SW); and the charging device (100) comprises a charging protection resistor. The implementation of the present solution is beneficial to improve the accuracy of charging signal detection.

Description

充电信号检测电路及车载设备Charging signal detection circuit and in-vehicle equipment 技术领域technical field
本申请涉及电动汽车技术领域，具体涉及一种充电信号检测电路及车载设备。The present application relates to the technical field of electric vehicles, in particular to a charging signal detection circuit and a vehicle-mounted device.
背景技术Background technique
随着电动汽车技术领域的快速发展，电动汽车已逐渐进入人们的生活，在通过充电设备对电动汽车进行充电的过程中，需要随时监控充电设备的状态以保证充电过程的安全，充电设备的状态通过充电信号进行判断，因此，充电信号的检测变得尤为重要。With the rapid development of electric vehicle technology, electric vehicles have gradually entered people's lives. In the process of charging electric vehicles through charging equipment, it is necessary to monitor the status of the charging equipment at any time to ensure the safety of the charging process and the status of the charging equipment. The judgment is made by the charging signal, so the detection of the charging signal becomes particularly important.
目前，整车系统中，低压地为车身，在通过充电设备给电动汽车充电的过程中，各用电设备和充电设备的地都与电动汽车的车身相连，加上电动汽车的车身在通过电流时又会有一定的阻抗，导致当各设备的地连接电动汽车的车身的不同位置时，各设备的地不处于同一个电势，如此，便形成了车身地偏移，在进行充电信号的检测时，往往会因为检测充电信号的过程中，未排除车身地偏移的影响，而导致充电信号的检测不准确，进而无法保证充电过程的安全性。At present, in the whole vehicle system, the low-voltage ground is the body. In the process of charging the electric vehicle through the charging equipment, the grounds of each electrical equipment and the charging equipment are connected to the body of the electric vehicle. In addition, the body of the electric vehicle is passing current. There will also be a certain impedance when the ground of each device is connected to different positions of the body of the electric vehicle, and the ground of each device is not at the same potential. In this way, the body ground offset is formed, and the detection of the charging signal is carried out. When the charging signal is detected, the influence of the ground offset of the vehicle body is not excluded, resulting in inaccurate detection of the charging signal, and thus the safety of the charging process cannot be guaranteed.
申请内容Application content
本申请提供了一种充电信号检测电路及车载设备，用以提升充电信号检测的准确性。The present application provides a charging signal detection circuit and a vehicle-mounted device, which are used to improve the accuracy of charging signal detection.
第一方面，本申请提供了一种充电信号检测电路，应用于电动汽车，包括电源、第一网络模块、第二网络模块、切换模块以及微控制单元，其中，In a first aspect, the present application provides a charging signal detection circuit, which is applied to an electric vehicle, and includes a power supply, a first network module, a second network module, a switching module, and a micro-control unit, wherein,
所述电源的正极分别连接所述第一网络模块的第一端和所述第二网络模块的第一端，所述第一网络模块的第二端连接所述切换模块的第一端，所述第二网络模块的第二端连接所述切换模块的第二端，所述切换模块的第三端连接所述微控制单元的第一端，所述微控制单元的第二端连接所述电动汽车的车身的第一位置，所述电源的负极连接所述电动汽车的车身的第二位置；The positive pole of the power supply is respectively connected to the first end of the first network module and the first end of the second network module, the second end of the first network module is connected to the first end of the switching module, so The second end of the second network module is connected to the second end of the switching module, the third end of the switching module is connected to the first end of the micro-control unit, and the second end of the micro-control unit is connected to the the first position of the body of the electric vehicle, and the negative pole of the power source is connected to the second position of the body of the electric vehicle;
当通过充电设备给所述电动汽车充电时，所述充电设备的第一端连接所述电动汽车的车身的第三位置，所述充电设备的第二端连接所述切换模块的第三端，所述充电设备包括充电保护电阻；When charging the electric vehicle through the charging device, the first end of the charging device is connected to the third position of the body of the electric vehicle, and the second end of the charging device is connected to the third end of the switching module, The charging device includes a charging protection resistor;
所述微控制单元用于在通过所述充电设备向所述电动汽车充电过程中控制所述切换模块选择导通所述第一网络模块和/或所述第二网络模块，其中，所述第一网络模块与所述第二网络模块不同，以及用于检测所述切换模块第三端的电压值，以及用于根据所述电压值计算出车身地偏移值，并根据所述车身地偏移值校正得到准确的充电信号，所述车身地偏移值为所述第三位置与所述第一位置之间的电势差值。The micro-control unit is configured to control the switching module to select and turn on the first network module and/or the second network module during the charging process of the electric vehicle through the charging device, wherein the first network module and/or the second network module are A network module is different from the second network module, and is used for detecting the voltage value of the third terminal of the switching module, and for calculating the offset value of the vehicle body according to the voltage value, and according to the offset value of the vehicle body The value is corrected to obtain an accurate charging signal, and the offset value of the vehicle body is the potential difference value between the third position and the first position.
在一个实施例中，所述第一网络模块包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种，所述第二网络模块包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种。In one embodiment, the first network module includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module, The second network module includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module.
在一个实施例中，所述第一恒流源网络模块包括稳压器件和第一电阻，其中，所述稳压器件的第一引脚连接所述电源的正极，所述稳压器件的第二引脚连接所述第一电阻的第一端，所述稳压器件的第三引脚分别连接所述第一电阻的第二端以及所述切换模块。In one embodiment, the first constant current source network module includes a voltage stabilizing device and a first resistor, wherein the first pin of the voltage stabilizing device is connected to the positive pole of the power supply, and the first pin of the voltage stabilizing device is connected to the positive pole of the power supply. Two pins are connected to the first end of the first resistor, and the third pin of the voltage regulator device is respectively connected to the second end of the first resistor and the switching module.
在一个实施例中，所述第二恒流源网络模块包括第一电阻、三极管、稳压器件以及第二电阻，所述第一电阻的第一端和所述稳压器件的负极连接所述电源的正极，所述第一电阻的第二端连接所述三极管的发射极，所述稳压器件的正极分别连接所述三极管的基极和所述第二电阻的第一端，所述第二电阻的第二端接地，所述三极管的集电极连接所述切换模块。In one embodiment, the second constant current source network module includes a first resistor, a triode, a voltage stabilizing device and a second resistor, and a first end of the first resistor and a negative electrode of the voltage stabilizing device are connected to the The positive pole of the power supply, the second end of the first resistor is connected to the emitter of the triode, the positive pole of the voltage stabilizing device is respectively connected to the base of the triode and the first end of the second resistor, the The second end of the two resistors is grounded, and the collector of the triode is connected to the switching module.
在一个实施例中，所述第三恒流源网络模块包括：电容、第一电阻、第二电阻、单向导通器件、第一三极管、第二三极管、稳压器件以及第三电阻，其中，所述电容的正极、所述第一电阻的第一端以及所述第二电阻的第一端连接所述电源的正极，所述电容的负极分别连接所述第一三极管的集电极、所述第二三极管的基极以及所述稳压器件的负极，所述第一电阻的第二端连接所述第一三极管的发射极，所述第二电阻的第二端连接所述单向导通器件的正极，所 述单项导通器件的负极分别连接所述第一三极管的基极和所述第二三极管的集电极，所述第二三极管的发射极连接所述第三电阻的第一端，所述第三电阻的第二端和所述稳压器件的正极连接所述切换模块。In one embodiment, the third constant current source network module includes: a capacitor, a first resistor, a second resistor, a one-way conduction device, a first transistor, a second transistor, a voltage regulator, and a third A resistor, wherein the positive electrode of the capacitor, the first end of the first resistor and the first end of the second resistor are connected to the positive electrode of the power supply, and the negative electrode of the capacitor is respectively connected to the first triode The collector of the second triode, the base of the second triode and the negative electrode of the voltage stabilizing device, the second end of the first resistor is connected to the emitter of the first triode, and the second end of the second resistor is connected to the emitter of the first triode. The second end is connected to the positive electrode of the one-way conduction device, and the negative electrode of the one-way conduction device is connected to the base electrode of the first triode and the collector of the second triode, respectively. The emitter of the pole tube is connected to the first end of the third resistor, and the second end of the third resistor and the positive electrode of the voltage regulator device are connected to the switching module.
在一个实施例中，所述单向导通器件包括二极管。In one embodiment, the one-way conducting device comprises a diode.
在一个实施例中，所述第四恒流源网络模块包括稳压器件、第一电阻、放大器、三极管以及第二电阻，其中，所述稳压器件的负极连接所述电源的正极，所述稳压器件的正极分别连接所述第一电阻的第一端和所述放大器的第一端，所述第一电阻的第二端接地，所述放大器的第二端分别连接所述第二电阻的第一端和所述三极管的发射极，所述第二电阻的第二端连接所述电源的正极，所述放大器的第三端连接所述三极管的基极，所述三极管的集电极连接所述切换模块。In one embodiment, the fourth constant current source network module includes a voltage stabilizing device, a first resistor, an amplifier, a triode and a second resistor, wherein the negative electrode of the voltage stabilizing device is connected to the positive electrode of the power supply, and the The positive pole of the voltage regulator is respectively connected to the first end of the first resistor and the first end of the amplifier, the second end of the first resistor is grounded, and the second end of the amplifier is respectively connected to the second resistor The first end of the amplifier and the emitter of the triode, the second end of the second resistor is connected to the positive electrode of the power supply, the third end of the amplifier is connected to the base of the triode, and the collector of the triode is connected the switching module.
在一个实施例中，所述稳压器件包括稳压二极管。In one embodiment, the voltage stabilizing device includes a zener diode.
第二方面，本申请提供了一种车载设备，所述车载设备包括如第一方面任一实施例所述的充电信号检测电路。In a second aspect, the present application provides an in-vehicle device, where the in-vehicle device includes the charging signal detection circuit according to any embodiment of the first aspect.
可以看出，在本申请中，充电信号检测电路，应用于电动汽车，包括电源、第一网络模块、第二网络模块、切换模块以及微控制单元，其中，电源的正极分别连接第一网络模块的第一端和第二网络模块的第一端，第一网络模块的第二端连接切换模块的第一端，第二网络模块的第二端连接切换模块的第二端，切换模块的第三端连接微控制单元的第一端，微控制单元的第二端连接电动汽车的车身的第一位置，电源的负极连接电动汽车的车身的第二位置；当通过充电设备给电动汽车充电时，充电设备的第一端连接电动汽车的车身的第三位置，充电设备的第二端连接切换模块的第三端，充电设备包括充电保护电阻；微控制单元用于在通过充电设备向电动汽车充电过程中控制切换模块选择导通第一网络模块和/或第二网络模块，其中，第一网络模块与第二网络模块不同，以及用于检测切换模块第三端的电压值，以及用于根据电压值计算出车身地偏移值，并根据车身地偏移值校正得到准确的充电信号，车身地偏移值为第一位置与第三位置之间的电势差值。可见，在通过充电设备向电动汽车充电的过程中，充电信号检测电路可以在不同的网络模块之间进行选择性导通以检测充电 设备的第二端在接入不同网络模块时电压值，并根据接入不同网络模块时的电压确定出车身地偏移值，以便于后续根据车身地偏移值针对检测到的电压值进行补偿以得到充电设备实际的电压值，进而根据实际的电压值针对检测到的充电信号进行校正，提升了充电信号检测的准确性，保证了电动汽车充电过程的稳定性和安全性。It can be seen that in this application, the charging signal detection circuit, applied to electric vehicles, includes a power supply, a first network module, a second network module, a switching module and a micro-control unit, wherein the positive pole of the power supply is connected to the first network module respectively. The first end of the first network module and the first end of the second network module, the second end of the first network module is connected to the first end of the switching module, the second end of the second network module is connected to the second end of the switching module, and the second end of the switching module is connected. The three ends are connected to the first end of the micro-control unit, the second end of the micro-control unit is connected to the first position of the body of the electric vehicle, and the negative pole of the power supply is connected to the second position of the body of the electric vehicle; when charging the electric vehicle through the charging device , the first end of the charging device is connected to the third position of the body of the electric vehicle, the second end of the charging device is connected to the third end of the switching module, and the charging device includes a charging protection resistor; During the charging process, the switching module is controlled to selectively turn on the first network module and/or the second network module, wherein the first network module is different from the second network module, and is used for detecting the voltage value of the third terminal of the switching module, and for detecting The offset value of the vehicle body is calculated from the voltage value, and an accurate charging signal is obtained by correcting the offset value of the vehicle body. The offset value of the vehicle body is the potential difference between the first position and the third position. It can be seen that in the process of charging the electric vehicle through the charging device, the charging signal detection circuit can selectively conduct between different network modules to detect the voltage value of the second end of the charging device when it is connected to different network modules, and The offset value of the vehicle body is determined according to the voltage when different network modules are connected, so that the detected voltage value can be compensated according to the offset value of the vehicle body to obtain the actual voltage value of the charging device, and then according to the actual voltage value The detected charging signal is corrected, which improves the accuracy of charging signal detection and ensures the stability and safety of the electric vehicle charging process.
附图说明Description of drawings
为了更清楚地说明本申请或背景技术中的技术方案，下面将对本申请或背景技术中所涉及到的附图作简单地介绍。In order to more clearly illustrate the technical solutions in the present application or the background technology, the accompanying drawings involved in the present application or the background technology will be briefly introduced below.
下面将对本申请所涉及到的附图作简单地介绍。The accompanying drawings involved in the present application will be briefly introduced below.
图1为本申请提供的一种充电信号检测电路的应用场景示意图；1 is a schematic diagram of an application scenario of a charging signal detection circuit provided by the present application;
图2为本申请提供的第一恒流源网络模块结构示意图；2 is a schematic structural diagram of a first constant current source network module provided by the present application;
图3为本申请提供的第二恒流源网络模块结构示意图；3 is a schematic structural diagram of a second constant current source network module provided by the present application;
图4为本申请提供的第三恒流源网络模块结构示意图；4 is a schematic structural diagram of a third constant current source network module provided by the present application;
图5为本申请提供的第四恒流源网络模块结构示意图。FIG. 5 is a schematic structural diagram of a fourth constant current source network module provided by the present application.
具体实施方式detailed description
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一部分的实施例，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做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.
以下分别进行详细说明。Each of them will be described in detail below.
本申请的说明书和权利要求书及所述附图中的术语“第一”、“第二”、“第三”和“第四”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”以及它的任何变形，意图在于覆盖不排他的包含。例如包括了一系列模块和器件的系统没有限定于已列出的模块和器件，而是可选地还包括没有列出的模块和器件，或可选地还包括对于这些系统固有的其它模块和器件。The terms "first", "second", "third" and "fourth" in the description and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a system comprising a series of modules and devices is not limited to the modules and devices listed, but optionally also includes modules and devices not listed, or optionally also includes other modules and devices inherent to these systems. device.
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。Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
下面结合附图对本申请进行介绍。The present application will be introduced below with reference to the accompanying drawings.
请参阅图1，图1是本申请提供的一种充电信号检测电路的应用场景示意图，如图1所示，所述充电信号检测电路110包括电源1101、第一网络模块1102、第二网络模块1103、切换模块SW以及微控制单元1104，其中，所述电源1101的正极分别连接所述第一网络模块1102的第一端和所述第二网络模块1103的第一端，所述第一网络模块1102的第二端连接所述切换模块SW的第一端，所述第二网络模块1103的第二端连接所述切换模块SW的第二端，所述切换模块SW的第三端连接所述微控制单元1104的第一端，所述微控制单元1104的第二端连接电动汽车的车身120的第一位置A，所述电源1101的负极连接所述电动汽车的车身120的第二位置B；Please refer to FIG. 1 , which is a schematic diagram of an application scenario of a charging signal detection circuit provided by the present application. As shown in FIG. 1 , the charging signal detection circuit 110 includes a power supply 1101 , a first network module 1102 , and a second network module 1103, the switching module SW and the micro-control unit 1104, wherein the positive pole of the power supply 1101 is respectively connected to the first end of the first network module 1102 and the first end of the second network module 1103, the first network The second end of the module 1102 is connected to the first end of the switching module SW, the second end of the second network module 1103 is connected to the second end of the switching module SW, and the third end of the switching module SW is connected to the The first end of the micro-control unit 1104 and the second end of the micro-control unit 1104 are connected to the first position A of the body 120 of the electric vehicle, and the negative electrode of the power supply 1101 is connected to the second position of the body 120 of the electric vehicle B;
当通过所述充电设备100给所述电动汽车充电时，所述充电设备100的第一端连接所述电动汽车的车身120的第三位置C，所述充电设备100的第二端连接所述切换模块SW的第三端，所述充电设备100包括充电保护电阻RC；When charging the electric vehicle through the charging device 100, the first end of the charging device 100 is connected to the third position C of the body 120 of the electric vehicle, and the second end of the charging device 100 is connected to the electric vehicle the third end of the switching module SW, the charging device 100 includes a charging protection resistor RC;
所述微控制单元1104用于在通过所述充电设备100向所述电动汽车充电过程中控制所述切换模块SW选择导通所述第一网络模块1102和/或所述第二网络模块1103，其中，所述第一网络模块1102与所述第二网络模块1103不同，以及用于检测所述切换模块SW第三端的电压值，以及用于根据所述电压值计算出车身地偏移值，并根据所述车身地偏移值校正得到准确的充电信号，所述车身地偏移值为所述第三位置C与所述第一位置A之间的电势差值。The micro-control unit 1104 is configured to control the switching module SW to select and turn on the first network module 1102 and/or the second network module 1103 during the charging process of the electric vehicle through the charging device 100 , Wherein, the first network module 1102 is different from the second network module 1103, and is used for detecting the voltage value of the third terminal of the switching module SW, and for calculating the offset value of the vehicle body according to the voltage value, An accurate charging signal is obtained by correcting the offset value of the vehicle body, where the offset value of the vehicle body is the potential difference between the third position C and the first position A.
其中，所述切换模块SW第三端的电压值即是所述充电设备100的第二端与所述第一位置A之间的电势差值。Wherein, the voltage value of the third terminal of the switching module SW is the potential difference between the second terminal of the charging device 100 and the first position A.
其中，所述第一网络模块1102包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种，所述第 二网络模块1103包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种。即，上述第一网络模块1102和上述第二网络模块1103均为恒流源网络模块，但第一网络模块1102和第二网络模块1103电路参数不同，即第一网络模块1102和第二网络模块1103提供的总电阻和电压不同。Wherein, the first network module 1102 includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module. The second network module 1103 includes at least one of a first constant current source network module, a second constant current source network module, a third constant current source network module, and a fourth constant current source network module. That is, the above-mentioned first network module 1102 and the above-mentioned second network module 1103 are both constant-current source network modules, but the circuit parameters of the first network module 1102 and the second network module 1103 are different, that is, the first network module 1102 and the second network module. The total resistance and voltage provided by the 1103 are different.
其中，恒流源模块是指输出电流保持恒定的电流源模块，且满足接入不同的恒流源网络模块时，微控制单元1104获取的采样数据(包括切换模块SW第三端的电压和流出恒流源网络模块的电流)的数据值不同，需要说明的是，所述第一网络模块1102与所述第二网络模块1103可以是结构相同、参数不同的恒流源网络模块，例如，所述第一网络模块1102与所述第二网络模块1103为结构相同且只是对应的总电阻的阻值不同的恒流源网络模块，使得在接入不同的恒流源网络模块时，微控制单元1104获取的采样数据的数据值不同。The constant current source module refers to a current source module whose output current is kept constant and satisfies the sampling data obtained by the micro-control unit 1104 when different constant current source network modules are connected (including the voltage at the third end of the switching module SW and the constant outflow constant current) The data value of the current of the current source network module) is different. It should be noted that the first network module 1102 and the second network module 1103 may be constant current source network modules with the same structure and different parameters. The first network module 1102 and the second network module 1103 are constant current source network modules with the same structure and only different resistance values of the corresponding total resistance, so that when connecting different constant current source network modules, the micro-control unit 1104 The data values of the acquired sample data are different.
其中，所述第一网络模块1102可以是第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的任意一种，所述第一网络模块1102还可以是第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少两种并联后得到的恒流源网络模块，同理，所述第二网络模块1103可以是第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的任意一种，所述第二网络模块1103还可以是第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少两种并联后得到的恒流源网络模块。Wherein, the first network module 1102 may be any one of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module. The first network module 1102 may also be a constant current obtained by connecting at least two of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module in parallel. source network module, in the same way, the second network module 1103 can be any of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module One, the second network module 1103 can also be at least two of the first constant current source network module, the second constant current source network module, the third constant current source network module and the fourth constant current source network module in parallel The constant current source network module obtained after.
下面，对本申请实施例中的车身地偏移进行详细的描述：在实际应用场景中，整车系统中的低压地为电动汽车的车身120，而充电设备100与充电信号检测电路110都与电动汽车的车身120相连，电动汽车的车身120在通过电流时又会有一定的阻抗，导致充电设备100的地与充电信号检测电路110的地在连接电动汽车的车身120的不同位置后，不为同一个电势，充电信号检测电路110通过微控制单元1104的第二端连接所述电动汽车的车身120的第一位置A，充电设备100连接所述电动汽车的车身120的第三位置C，因此微控制单元 1104检测到的切换模块SW的第三端的电压值为切换模块SW的第三端与第一位置A之间的电势差值，并不是充电设备100两端的电势差值，即切换模块SW的第三端的电压值是充电设备100的第二端和第一端之间的电势差值以及第三位置C和第一位置A之间的电势差值之和，其中，第三位置C与第一位置A之间的电势差值就是本申请实施例中的车身地偏值。Below, the body ground offset in the embodiment of the present application is described in detail: in an actual application scenario, the low-voltage ground in the entire vehicle system is the body 120 of the electric vehicle, and the charging device 100 and the charging signal detection circuit 110 are both connected to the electric vehicle. The body 120 of the car is connected, and the body 120 of the electric car will have a certain impedance when passing current, so that the ground of the charging device 100 and the ground of the charging signal detection circuit 110 are not connected to different positions of the body 120 of the electric car. At the same potential, the charging signal detection circuit 110 is connected to the first position A of the body 120 of the electric vehicle through the second end of the micro-control unit 1104, and the charging device 100 is connected to the third position C of the body 120 of the electric vehicle. Therefore, The voltage value of the third terminal of the switching module SW detected by the micro-control unit 1104 is the potential difference between the third terminal of the switching module SW and the first position A, not the potential difference between the two ends of the charging device 100, that is, the voltage value of the switching module SW. The voltage value of the third terminal is the sum of the potential difference between the second terminal and the first terminal of the charging device 100 and the potential difference between the third position C and the first position A, wherein the third position C and the first position The potential difference between A is the ground offset value of the vehicle body in the embodiment of the present application.
下面，具体介绍通过充电信号检测系统10实现确定车身地偏移值的过程，包括步骤1和步骤2。In the following, the process of determining the offset value of the vehicle body through the charging signal detection system 10 will be specifically introduced, including step 1 and step 2 .
步骤1，当通过所述充电设备100给电动汽车充电时，充电信号检测系统10执行以下任意一种操作：第一种，在通过微控制单元1104控制切换模块SW导通第一网络模块1102时，通过微控制单元1104检测切换模块SW的第三端的电压值V 1以及通过微控制单元1104确定切换模块SW的第三端的电流值I 1，在通过微控制单元1104控制切换模块SW导通第二网络模块1103时，通过微控制单元1104检测切换模块SW的第三端的电压值V 2以及通过微控制单元1104确定切换模块SW的第三端的电流值I 2；第二种，在通过微控制单元1104导通第一网络模块1102时，通过微控制单元1104检测切换模块SW的第三端的电压值V 1以及通过微控制单元1104确定切换模块SW的第三端的电流值I 1，在通过微控制单元1104导通第一网络模块1102和第二网络模块1103时，通过控制单元1104检测切换模块SW的第三端的电压值V 2以及通过微控制单元1104确定切换模块SW的第三端的电流值I 2；第三种，在通过微控制单元1104导通第二网络模块1103时，通过微控制单元1104检测切换模块SW的第三端的电压值V 1以及通过微控制单元1104确定切换模块SW的第三端的电流值I 1，在通过微控制单元1104导通第一网络模块1102和第二网络模块1103时，通过微控制单元1104检测切换模块SW的第三端的电压值V 2以及通过微控制单元1104确定切换模块SW的第三端的电流值I 2； Step 1, when charging the electric vehicle through the charging device 100, the charging signal detection system 10 performs any one of the following operations: First, when the micro-control unit 1104 controls the switching module SW to turn on the first network module 1102 , the voltage value V 1 of the third end of the switching module SW is detected by the micro-control unit 1104 and the current value I 1 of the third end of the switching module SW is determined by the micro-control unit 1104, and the micro-control unit 1104 controls the switching module SW to turn on the first When there are two network modules 1103, the micro-control unit 1104 detects the voltage value V 2 of the third terminal of the switching module SW and determines the current value I 2 of the third terminal of the switching module SW by the micro-control unit 1104; When the unit 1104 turns on the first network module 1102, the micro-control unit 1104 detects the voltage value V 1 of the third terminal of the switching module SW and determines the current value I 1 of the third terminal of the switching module SW through the micro-control unit 1104. When the control unit 1104 turns on the first network module 1102 and the second network module 1103, the control unit 1104 detects the voltage value V 2 of the third terminal of the switching module SW and determines the current value of the third terminal of the switching module SW through the micro-control unit 1104 I 2 ; the third type, when the second network module 1103 is turned on by the micro control unit 1104, the voltage value V 1 of the third end of the switching module SW is detected by the micro control unit 1104 and the voltage value V 1 of the switching module SW is determined by the micro control unit 1104 The current value I 1 of the third terminal, when the first network module 1102 and the second network module 1103 are turned on by the micro control unit 1104 , the voltage value V 2 of the third terminal of the switching module SW is detected by the micro control unit 1104 and the voltage value V 2 of the third terminal of the switching module SW is detected by the micro control unit 1104 The unit 1104 determines the current value I 2 of the third terminal of the switching module SW;
其中，通过微控制单元1104控制所述切换模块SW导通第一网络模块1102和第二网络模块1103是指通过微控制单元1104控制所述切换模块SW同时导通所述第一网络模块1102以及所述第二网络模块1103，实质是将第一网络模块1102以及所述第二网络模块1103并联后接入所述充电信号检测电路110。Wherein, controlling the switching module SW to turn on the first network module 1102 and the second network module 1103 through the micro-control unit 1104 refers to controlling the switching module SW to turn on the first network module 1102 and the second network module 1103 through the micro-control unit 1104 at the same time. The second network module 1103 is substantially connected to the charging signal detection circuit 110 after connecting the first network module 1102 and the second network module 1103 in parallel.
需要说明的是，第一网络模块1102和第二网络模块1103均为恒流源网络模块，在第一网络模块1102和第二网络模块1103确定的情况下，将只接通第一网络模块1102、只接通第二网络模块1103、同时接通第一网络模块1102和第二网络模块1103三种情况流过所述充电设备100的电流对应的电流值预先存储在微控制单元1104中，则微控制单元1104可以根据网络模块的接通情况确定对应的输出电流的电流值。It should be noted that the first network module 1102 and the second network module 1103 are both constant-current source network modules, and only the first network module 1102 will be connected when the first network module 1102 and the second network module 1103 are determined. , only the second network module 1103 is turned on, and the first network module 1102 and the second network module 1103 are turned on at the same time. The current value corresponding to the current flowing through the charging device 100 is stored in the micro-control unit 1104 in advance, then The micro-control unit 1104 may determine the current value of the corresponding output current according to the connection state of the network module.
步骤2，根据电压值V 1、电流值I 1、电压值V 2以及电流值I 2确定充电保护电阻RC的阻值R C和车身地偏移值V p； Step 2, according to the voltage value V 1 , the current value I 1 , the voltage value V 2 and the current value I 2 , determine the resistance value RC of the charging protection resistor RC and the vehicle body ground offset value V p ;
其中，电压值V 1、电流值I 1、电压值V 2、电流值I 2、充电保护电阻RC的阻值R C和车身地偏移值V p的对应关系为：V 1＝R C*I 1+V p，V 2＝R C*I 2+V p，最终，能够得到充电保护电阻RC的阻值R C和所述车身地偏移值V p。 Among them, the corresponding relationship between the voltage value V 1 , the current value I 1 , the voltage value V 2 , the current value I 2 , the resistance value RC of the charging protection resistor RC and the vehicle body ground offset value V p is: V 1 =RC * I 1 +V p , V 2 =RC *I 2 + V p , finally, the resistance value RC of the charging protection resistor RC and the offset value V p of the vehicle body can be obtained.
可见，本示例中，在通过充电设备100向电动汽车充电的过程中，充电信号检测电路110可以在不同的网络模块之间进行选择性导通以检测充电设备100的第二端在接入不同网络模块时电压值，并根据连接不同网络模块时的电压值确定出车身地偏移值，以便于后续根据车身地偏移值针对检测到的电压值进行补偿以得到充电设备100第二端和第一端之间实际的电压值，进而根据实际的电压值对检测到的充电信号进行校正，提升了充电信号检测的准确性，保证了电动汽车充电过程的稳定性和安全性。It can be seen that, in this example, in the process of charging the electric vehicle through the charging device 100, the charging signal detection circuit 110 can selectively conduct between different network modules to detect that the second end of the charging device 100 is connected to different The voltage value when the network module is used, and the offset value of the vehicle body is determined according to the voltage value when different network modules are connected, so that the detected voltage value can be compensated according to the offset value of the vehicle body to obtain the second terminal and the charging device 100. The actual voltage value between the first terminals, and then the detected charging signal is corrected according to the actual voltage value, which improves the accuracy of the charging signal detection and ensures the stability and safety of the electric vehicle charging process.
下面，对本申请涉及的几种恒流源网络模块进行介绍。Below, several constant current source network modules involved in this application are introduced.
请参阅图2，图2是本申请涉及的第一恒流源网络模块的结构示意图，如图2所示，该第一恒流源网络模块包括：稳压器件和第一电阻R1，其中，所述稳压器件的第二引脚连接所述第一电阻R1的第一端，所述稳压器件的第三引脚连接所述第一电阻R1的第二端。Please refer to FIG. 2. FIG. 2 is a schematic structural diagram of the first constant current source network module involved in the present application. As shown in FIG. 2, the first constant current source network module includes: a voltage stabilizing device and a first resistor R1, wherein, The second pin of the voltage regulator device is connected to the first end of the first resistor R1, and the third pin of the voltage regulator device is connected to the second end of the first resistor R1.
其中，第一恒流源网络模块通过所述稳压器件的第三引脚连接所述切换模块SW的第一端或者第二端，通过所述稳压器件的第一引脚连接所述电源1101的正极。Wherein, the first constant current source network module is connected to the first end or the second end of the switching module SW through the third pin of the voltage regulator device, and the power supply is connected to the power supply through the first pin of the voltage regulator device The positive pole of the 1101.
其中，所述稳压器件的第一引脚为电压调节脚；第二引脚为电压输出脚；第三引脚为电压输入脚，该稳压器件可以是LM317芯片。该第一恒流源网络 模块输出的电流I out即流过所述充电保护电阻RC的电流，与第一电阻R1的阻值R 1的对应关系为： Wherein, the first pin of the voltage regulator device is a voltage regulation pin; the second pin is a voltage output pin; the third pin is a voltage input pin, and the voltage regulator device can be an LM317 chip. The current Iout output by the first constant current source network module is the current flowing through the charging protection resistor RC, and the corresponding relationship with the resistance value R1 of the first resistor R1 is:
I out＝(V ret/R 1)+I Adj＝1.25V/R 1； I out =(V ret /R 1 )+I Adj =1.25V/R 1 ;
其中，V ret为所述第一电阻R 1两端的电压值，I Adj为所述第一引脚输出的电流的电流值，1.25V为所述第一引脚与所述第二引脚之间为电压基准。 Wherein, V ret is the voltage value across the first resistor R 1 , I Adj is the current value of the current output by the first pin, and 1.25V is the difference between the first pin and the second pin is the voltage reference.
在该第一恒流源网络模块中，第一电阻R1一旦确定，则流出所述第一恒流源网络模块的电流恒定。In the first constant current source network module, once the first resistor R1 is determined, the current flowing out of the first constant current source network module is constant.
可见，上述充电信号检测电路110通过接入所述第一恒流源网络模块，能够提供恒流电源。It can be seen that the above-mentioned charging signal detection circuit 110 can provide a constant current power supply by connecting to the first constant current source network module.
请参阅图3，图3是本申请涉及的第二恒流源网络模块的结构示意图，如图3所示，该第二恒流源网络模块包括第一电阻R1、三极管、稳压器件和第二电阻R2，所述第一电阻R1的第二端连接所述三极管的发射极，所述稳压器件的正极分别连接所述三极管的基极和所述第二电阻R2的第一端，所述第二电阻R2的第二端接地。Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of the second constant current source network module involved in the present application. As shown in FIG. 3 , the second constant current source network module includes a first resistor R1 , a transistor, a voltage stabilizing device and a second constant current source network module. Two resistors R2, the second end of the first resistor R1 is connected to the emitter of the triode, the positive electrode of the voltage stabilizing device is connected to the base of the triode and the first end of the second resistor R2 respectively, so The second end of the second resistor R2 is grounded.
其中，第二恒流源网络模块通过所述第一电阻R1的第一端和所述稳压器件的负极连接所述电源1101的正极，通过所述三极管的集电极连接所述切换模块SW的第一端或者第二端。The second constant current source network module is connected to the positive electrode of the power supply 1101 through the first end of the first resistor R1 and the negative electrode of the voltage regulator device, and is connected to the switching module SW through the collector of the triode. the first end or the second end.
其中，所述稳压器件可以是稳压二极管。Wherein, the voltage-stabilizing device may be a voltage-stabilizing diode.
其中，当第一电阻R1、第二电阻R2确定后，流出所述第二恒流源网络模块的电流恒定。Wherein, after the first resistor R1 and the second resistor R2 are determined, the current flowing out of the second constant current source network module is constant.
可见，本示例中，上述充电信号检测电路110通过接入所述第二恒流源网络模块，能够提供恒流电源。It can be seen that, in this example, the above-mentioned charging signal detection circuit 110 can provide a constant current power supply by connecting to the second constant current source network module.
请参阅图4，图4是本申请涉及的第三恒流源网络模块的结构示意图，如图4所示，该第三恒流源网络模块包括电容、第一电阻R1、第二电阻R2、单向导通器件、第一三极管VT1、第二三极管VT2、稳压器件以及第三电阻R3，其中，所述电容的负极分别连接所述第一三极管VT1的集电极、所述第二三极管VT2的基极以及所述稳压器件的负极，所述第一电阻R1的第二端连接所述第一三极管VT1的发射极，所述第二电阻R2的第二端连接所述单向导通器 件的正极，所述单项导通器件的负极分别连接所述第一三极管VT1的基极和所述第二三极管VT2的集电极，所述第二三极管VT2的发射极连接所述第三电阻R3的第一端。Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of a third constant current source network module involved in the present application. As shown in FIG. 4, the third constant current source network module includes a capacitor, a first resistor R1, a second resistor R2, The unidirectional conduction device, the first triode VT1, the second triode VT2, the voltage regulator device and the third resistor R3, wherein the negative electrode of the capacitor is respectively connected to the collector of the first triode VT1, the The base of the second triode VT2 and the negative electrode of the voltage regulator device, the second end of the first resistor R1 is connected to the emitter of the first triode VT1, and the second end of the second resistor R2 is connected to the emitter of the first triode VT1. The two terminals are connected to the positive pole of the one-way conduction device, and the negative pole of the one-way conduction device is connected to the base of the first transistor VT1 and the collector of the second transistor VT2 respectively. The emitter of the transistor VT2 is connected to the first end of the third resistor R3.
其中，该第三恒流源网络模块通过所述第三电阻R3的第二端和所述稳压器件的正极连接所述切换模块SW的第一端或者第二端，通过所述电容的正极、所述第一电阻R1的第一端以及所述第二电阻R2的第一端连接所述电源1101的正极。The third constant current source network module is connected to the first end or the second end of the switching module SW through the second end of the third resistor R3 and the positive electrode of the voltage regulator device, and the positive electrode of the capacitor is connected to the first end or the second end of the switching module SW. , the first end of the first resistor R1 and the first end of the second resistor R2 are connected to the positive electrode of the power supply 1101 .
其中，所述稳压器件可以是稳压二极管。Wherein, the voltage-stabilizing device may be a voltage-stabilizing diode.
其中，所述单向导通器件可以是二极管。Wherein, the unidirectional conduction device may be a diode.
其中，流出所述第三恒流源网络模块的电流为恒定的电流，且所述电流与第一电阻R1的阻值R 1的对应关系为：I＝2*2.5R 1，在所述第一电阻R1的阻值R 1确定的情况下，流出所述第三恒流源网络模块的电流恒定。 Wherein, the current flowing out of the third constant current source network module is a constant current, and the corresponding relationship between the current and the resistance value R 1 of the first resistor R1 is: I=2*2.5R 1 . When the resistance value R1 of a resistor R1 is determined, the current flowing out of the third constant current source network module is constant.
可见，本示例中，上述充电信号检测电路110通过接入所述第三恒流源网络模块，提供恒流电源。It can be seen that, in this example, the above-mentioned charging signal detection circuit 110 provides a constant current power supply by connecting to the third constant current source network module.
请参阅图5，图5是本申请的涉及的第四恒流源网络模块的结构示意图，如图5所示，该第四恒流源网络模块包括：稳压器件、第一电阻R1、放大器、三极管和第二电阻R2，其中，所述稳压器件的正极分别连接所述第一电阻R1的第一端和所述放大器的第一端，所述第一电阻R1的第二端接地，所述放大器的第二端分别连接所述第二电阻R2的第一端和所述三极管的发射极，所述第二电阻R2的第二端连接所述电源1101的正极，所述放大器的第三端连接所述三极管的基极。Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of the fourth constant current source network module involved in the present application. As shown in FIG. 5, the fourth constant current source network module includes: a voltage stabilizing device, a first resistor R1, an amplifier , a triode and a second resistor R2, wherein the positive electrode of the voltage stabilizing device is connected to the first end of the first resistor R1 and the first end of the amplifier respectively, and the second end of the first resistor R1 is grounded, The second end of the amplifier is respectively connected to the first end of the second resistor R2 and the emitter of the triode, the second end of the second resistor R2 is connected to the positive electrode of the power supply 1101, and the first end of the amplifier is connected. The three terminals are connected to the base of the triode.
其中，该第四恒流源网络模块通过所述稳压器件的负极和所述第二电阻R2的第二端连接所述电源1101的正极，通过所述三极管的集电极连接所述切换模块SW的第一端或者第二端。The fourth constant current source network module is connected to the positive pole of the power supply 1101 through the negative pole of the voltage regulator and the second end of the second resistor R2, and is connected to the switching module SW through the collector of the triode the first or second end.
其中，所述稳压器件可以是稳压二极管。Wherein, the voltage-stabilizing device may be a voltage-stabilizing diode.
其中，在第一电阻R1的阻值恒定的情况下，所述稳压器件的正极、所述第一电阻R1的第一端以及所述放大器的第一端电压恒定，此时，第二电阻R2两端的压降恒定，流过所述第二电阻R2的电流恒定，最终，流出所述第四恒 流源网络模块的电流恒定。Wherein, when the resistance value of the first resistor R1 is constant, the voltage of the positive electrode of the voltage stabilizing device, the first end of the first resistor R1 and the first end of the amplifier are constant. At this time, the second resistor The voltage drop across R2 is constant, the current flowing through the second resistor R2 is constant, and finally, the current flowing out of the fourth constant current source network module is constant.
可见，本示例中，上述充电信号检测电路110通过接入第四恒流源网络模块，提供恒流电源。It can be seen that, in this example, the above-mentioned charging signal detection circuit 110 provides a constant current power supply by connecting to the fourth constant current source network module.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图2所示的第一恒流源网络模块，所述第二网络模块1103为图3所示的第二恒流源网络模块。In a possible embodiment, in the above-mentioned charging signal detection circuit 110 , the first network module 1102 is the first constant current source network module shown in FIG. 2 , and the second network module 1103 is the one shown in FIG. 3 . The second constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第一恒流源网络模块与第二恒流源网络模块，在选择接入第一恒流源网络模块和/或第二恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects to access the first constant current source network module and/or the second constant current source network by setting the first constant current source network module and the second constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图4所示的第三恒流源网络模块，所述第二网络模块1103为图5所示的第四恒流源网络模块。In a possible embodiment, in the above-mentioned charging signal detection circuit 110 , the first network module 1102 is the third constant current source network module shown in FIG. 4 , and the second network module 1103 is shown in FIG. 5 . The fourth constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第三恒流源网络模块与第四恒流源网络模块，在选择接入第三恒流源网络模块和/或第四恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects and accesses the third constant current source network module and/or the fourth constant current source network by setting the third constant current source network module and the fourth constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图2所示的第一恒流源网络模块，所述第二网络模块1103为图4所示的第三恒流源网络模块。In a possible embodiment, in the above-mentioned charging signal detection circuit 110 , the first network module 1102 is the first constant current source network module shown in FIG. 2 , and the second network module 1103 is the one shown in FIG. 4 . The third constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第一恒流源网络模块与第三恒流源网络模块，在选择接入第一恒流源网络模块和/或第三恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects to access the first constant current source network module and/or the third constant current source network by setting the first constant current source network module and the third constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图2所示的第一恒流源网络模块，所述第二网络模块1103为图5所示的第四恒流源网络模块。In a possible embodiment, in the above-mentioned charging signal detection circuit 110 , the first network module 1102 is the first constant current source network module shown in FIG. 2 , and the second network module 1103 is the one shown in FIG. 5 . The fourth constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第一恒流源网络模块 与第四恒流源网络模块，在选择接入第一恒流源网络模块和/或第四恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects to access the first constant current source network module and/or the fourth constant current source network by setting the first constant current source network module and the fourth constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图3所示的第二恒流源网络模块，所述第二网络模块1103为图4所示的第三恒流源网络模块。In a possible embodiment, in the above-mentioned charging signal detection circuit 110 , the first network module 1102 is the second constant current source network module shown in FIG. 3 , and the second network module 1103 is the second network module shown in FIG. 4 . The third constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第二恒流源网络模块与第三恒流源网络模块，在选择接入第二恒流源网络模块和/或第三恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects and accesses the second constant current source network module and/or the third constant current source network by setting the second constant current source network module and the third constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
在一个可能的实施例中，上述充电信号检测电路110中，所述第一网络模块1102为图3所示的第二恒流源网络模块，所述第二网络模块1103为图5所示的第四恒流源网络模块。In a possible embodiment, in the above charging signal detection circuit 110 , the first network module 1102 is the second constant current source network module shown in FIG. 3 , and the second network module 1103 is the second network module shown in FIG. 5 . The fourth constant current source network module.
可见，在本示例中,充电信号检测电路110通过设置第二恒流源网络模块与第四恒流源网络模块，在选择接入第二恒流源网络模块和/或第四恒流源网络模块的情况下，采集不同的采样数据，得到充电保护电阻RC的阻值以及车身地偏移值。It can be seen that, in this example, the charging signal detection circuit 110 selects and accesses the second constant current source network module and/or the fourth constant current source network by setting the second constant current source network module and the fourth constant current source network module. In the case of the module, different sampling data are collected to obtain the resistance value of the charging protection resistor RC and the offset value of the vehicle body.
本申请还提供一种车载设备，其中，该车载设备包括如上述实施例中记载的任一充电信号检测电路。The present application also provides an in-vehicle device, wherein the in-vehicle device includes any of the charging signal detection circuits described in the above embodiments.
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。In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.
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，在具体实现方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。The embodiments of the present application have been introduced in detail above, and specific examples are used to illustrate the principles and implementations of the present application. The descriptions of the above embodiments are only used to help understand the present application and its core ideas; According to the idea of the application, there will be changes in the specific implementation mode and application scope. To sum up, the content of this specification should not be construed as a limitation to the application.

Claims (9)

  1. 一种充电信号检测电路，其特征在于，应用于电动汽车，包括电源、第一网络模块、第二网络模块、切换模块以及微控制单元，其中，A charging signal detection circuit, characterized in that, applied to an electric vehicle, includes a power supply, a first network module, a second network module, a switching module and a micro-control unit, wherein,
    所述电源的正极分别连接所述第一网络模块的第一端和所述第二网络模块的第一端，所述第一网络模块的第二端连接所述切换模块的第一端，所述第二网络模块的第二端连接所述切换模块的第二端，所述切换模块的第三端连接所述微控制单元的第一端，所述微控制单元的第二端连接所述电动汽车的车身的第一位置，所述电源的负极连接所述电动汽车的车身的第二位置；The positive pole of the power supply is respectively connected to the first end of the first network module and the first end of the second network module, the second end of the first network module is connected to the first end of the switching module, so The second end of the second network module is connected to the second end of the switching module, the third end of the switching module is connected to the first end of the micro-control unit, and the second end of the micro-control unit is connected to the the first position of the body of the electric vehicle, and the negative pole of the power source is connected to the second position of the body of the electric vehicle;
    当通过充电设备给所述电动汽车充电时，所述充电设备的第一端连接所述电动汽车的车身的第三位置，所述充电设备的第二端连接所述切换模块的第三端，所述充电设备包括充电保护电阻；When charging the electric vehicle through the charging device, the first end of the charging device is connected to the third position of the body of the electric vehicle, and the second end of the charging device is connected to the third end of the switching module, The charging device includes a charging protection resistor;
    所述微控制单元用于在通过所述充电设备向所述电动汽车充电过程中控制所述切换模块选择导通所述第一网络模块和/或所述第二网络模块，其中，所述第一网络模块与所述第二网络模块不同，以及用于检测所述切换模块第三端的电压值，以及用于根据所述电压值计算出车身地偏移值，并根据所述车身地偏移值校正得到准确的充电信号，所述车身地偏移值为所述第三位置与所述第一位置之间的电势差值。The micro-control unit is configured to control the switching module to select and turn on the first network module and/or the second network module during the charging process of the electric vehicle through the charging device, wherein the first network module and/or the second network module are A network module is different from the second network module, and is used for detecting the voltage value of the third terminal of the switching module, and for calculating the offset value of the vehicle body according to the voltage value, and according to the offset value of the vehicle body The value is corrected to obtain an accurate charging signal, and the offset value of the vehicle body is the potential difference value between the third position and the first position.
  2. 根据权利要求1所述的充电信号检测电路，其特征在于，所述第一网络模块包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种，所述第二网络模块包括第一恒流源网络模块、第二恒流源网络模块、第三恒流源网络模块以及第四恒流源网络模块中的至少一种。The charging signal detection circuit according to claim 1, wherein the first network module comprises a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module At least one of the flow source network modules, the second network module includes a first constant current source network module, a second constant current source network module, a third constant current source network module and a fourth constant current source network module. at least one.
  3. 根据权利要求2所述的充电信号检测电路，其特征在于，所述第一恒流源网络模块包括稳压器件和第一电阻，其中，所述稳压器件的第一引脚连接所述电源的正极，所述稳压器件的第二引脚连接所述第一电阻的第一端，所述稳压器件的第三引脚分别连接所述第一电阻的第二端以及所述切换模块。The charging signal detection circuit according to claim 2, wherein the first constant current source network module comprises a voltage stabilizing device and a first resistor, wherein the first pin of the voltage stabilizing device is connected to the power supply The positive pole of the voltage regulator device is connected to the first end of the first resistor, and the third pin of the voltage regulator device is connected to the second end of the first resistor and the switching module respectively. .
  4. 根据权利要求2所述的充电信号检测电路，其特征在于，所述第二恒流源网络模块包括第一电阻、三极管、稳压器件以及第二电阻，所述第一电阻 的第一端和所述稳压器件的负极连接所述电源的正极，所述第一电阻的第二端连接所述三极管的发射极，所述稳压器件的正极分别连接所述三极管的基极和所述第二电阻的第一端，所述第二电阻的第二端接地，所述三极管的集电极连接所述切换模块。The charging signal detection circuit according to claim 2, wherein the second constant current source network module comprises a first resistor, a triode, a voltage regulator and a second resistor, the first end of the first resistor and the The negative pole of the voltage regulator device is connected to the positive pole of the power supply, the second end of the first resistor is connected to the emitter of the transistor, and the positive pole of the regulator device is connected to the base of the transistor and the third pole respectively. The first end of the two resistors, the second end of the second resistor are grounded, and the collector of the triode is connected to the switching module.
  5. 根据权利要求2所述的充电信号检测电路，其特征在于，所述第三恒流源网络模块包括：电容、第一电阻、第二电阻、单向导通器件、第一三极管、第二三极管、稳压器件以及第三电阻，其中，所述电容的正极、所述第一电阻的第一端以及所述第二电阻的第一端连接所述电源的正极，所述电容的负极分别连接所述第一三极管的集电极、所述第二三极管的基极以及所述稳压器件的负极，所述第一电阻的第二端连接所述第一三极管的发射极，所述第二电阻的第二端连接所述单向导通器件的正极，所述单项导通器件的负极分别连接所述第一三极管的基极和所述第二三极管的集电极，所述第二三极管的发射极连接所述第三电阻的第一端，所述第三电阻的第二端和所述稳压器件的正极连接所述切换模块。The charging signal detection circuit according to claim 2, wherein the third constant current source network module comprises: a capacitor, a first resistor, a second resistor, a unidirectional conduction device, a first transistor, a second A triode, a voltage stabilizing device and a third resistor, wherein the anode of the capacitor, the first end of the first resistor and the first end of the second resistor are connected to the anode of the power supply, and the anode of the capacitor is connected to the anode of the power supply. The negative electrode is respectively connected to the collector of the first triode, the base of the second triode and the negative electrode of the voltage regulator device, and the second end of the first resistor is connected to the first triode The emitter of the second resistor, the second end of the second resistor is connected to the positive electrode of the one-way conduction device, and the negative electrode of the one-way conduction device is connected to the base of the first transistor and the second transistor respectively. The collector of the transistor, the emitter of the second transistor is connected to the first end of the third resistor, and the second end of the third resistor and the positive electrode of the voltage regulator device are connected to the switching module.
  6. 根据权利要求5所述的充电信号检测电路，其特征在于，所述单向导通器件包括二极管。The charging signal detection circuit according to claim 5, wherein the one-way conduction device comprises a diode.
  7. 根据权利要求2所述的充电信号检测电路，其特征在于，所述第四恒流源网络模块包括稳压器件、第一电阻、放大器、三极管以及第二电阻，其中，所述稳压器件的负极连接所述电源的正极，所述稳压器件的正极分别连接所述第一电阻的第一端和所述放大器的第一端，所述第一电阻的第二端接地，所述放大器的第二端分别连接所述第二电阻的第一端和所述三极管的发射极，所述第二电阻的第二端连接所述电源的正极，所述放大器的第三端连接所述三极管的基极，所述三极管的集电极连接所述切换模块。The charging signal detection circuit according to claim 2, wherein the fourth constant current source network module comprises a voltage stabilizing device, a first resistor, an amplifier, a transistor and a second resistor, wherein the voltage stabilizing device has a The negative pole is connected to the positive pole of the power supply, the positive pole of the voltage stabilizing device is respectively connected to the first end of the first resistor and the first end of the amplifier, the second end of the first resistor is grounded, and the amplifier The second end is respectively connected to the first end of the second resistor and the emitter of the triode, the second end of the second resistor is connected to the positive electrode of the power supply, and the third end of the amplifier is connected to the triode the base, and the collector of the triode is connected to the switching module.
  8. 根据权利要求4-7任一项所述的充电信号检测电路，其特征在于，所述稳压器件包括稳压二极管。The charging signal detection circuit according to any one of claims 4-7, wherein the voltage regulator device comprises a voltage regulator diode.
  9. 一种车载设备，其特征在于，所述车载设备包括如权利要求1-8任一项所述的充电信号检测电路。An in-vehicle device, characterized in that the in-vehicle device comprises the charging signal detection circuit according to any one of claims 1-8.
PCT/CN2020/116553 2020-09-21 2020-09-21 Charging signal detection circuit and vehicle-mounted device WO2022056919A1 (en)

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