CN114007897A - Charging signal detection circuit and vehicle-mounted equipment - Google Patents

Charging signal detection circuit and vehicle-mounted equipment Download PDF

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Publication number
CN114007897A
CN114007897A CN202080015912.XA CN202080015912A CN114007897A CN 114007897 A CN114007897 A CN 114007897A CN 202080015912 A CN202080015912 A CN 202080015912A CN 114007897 A CN114007897 A CN 114007897A
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China
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network module
resistor
constant current
current source
source network
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CN202080015912.XA
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CN114007897B (en
Inventor
刘鹏飞
胡定高
唐弘扬
王俊
吴壬华
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Shenzhen Shinry Technologies Co Ltd
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Shenzhen Shinry Technologies Co Ltd
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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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A charging signal detection circuit (110) and an on-board device are provided, 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, wherein the positive pole of the power supply (1101) is respectively connected with the first end of the first network module (1102) and the first end of the second network module (1103), the second end of the first network module (1102) is connected with the first end of the switching module (SW), the second end of the second network module (1103) is connected with the second end of the switching module (SW), the third end of the switching module (SW) is connected with the first end of the micro-control unit, the second end of the micro-control unit is connected with a first position (A) of a body (120) of an electric automobile, and the negative pole of the power supply (1101) is connected with a second position (B) of the body (120) of the electric automobile; when the electric automobile is charged through the charging device (100), the first end of the charging device (100) is connected with the third position (C) of the automobile body (120) of the electric automobile, the second end of the charging device (100) is connected with the third end of the switching module (SW), and the charging device (100) comprises a charging protection resistor. This scheme of implementation is favorable to promoting the accuracy that the signal that charges detected.

Description

Charging signal detection circuit and vehicle-mounted equipment
Technical Field
The application relates to the technical field of electric automobiles, in particular to a charging signal detection circuit and vehicle-mounted equipment.
Background
Along with the rapid development of the technical field of electric automobiles, the electric automobiles gradually enter the lives of people, the state of the charging equipment needs to be monitored at any time to ensure the safety of the charging process in the process of charging the electric automobiles through the charging equipment, and the state of the charging equipment is judged through charging signals, so that the detection of the charging signals becomes particularly important.
At present, in a whole vehicle system, a vehicle body is a low-voltage ground, in the process of charging an electric vehicle through a charging device, grounds of each electric device and the charging device are connected with the vehicle body of the electric vehicle, and in addition, the vehicle body of the electric vehicle has certain impedance when current passes through the vehicle body, so that when the ground of each device is connected with different positions of the vehicle body of the electric vehicle, the grounds of each device are not at the same potential, so that vehicle body ground deviation is formed, and in the process of detecting a charging signal, the influence of the vehicle body ground deviation is not eliminated, so that the detection of the charging signal is inaccurate, and the safety of the charging process cannot be ensured.
Disclosure of Invention
The application provides a charge signal detection circuit and vehicle-mounted equipment for promote the accuracy that charge signal detected.
In a first aspect, the present application provides a charging signal detection circuit applied to an electric vehicle, comprising a power supply, a first network module, a second network module, a switching module, and a micro control unit,
the positive electrode of the power supply is respectively connected with 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 with the first end of the switching module, the second end of the second network module is connected with the second end of the switching module, the third end of the switching module is connected with the first end of the micro control unit, the second end of the micro control unit is connected with the first position of the body of the electric automobile, and the negative electrode of the power supply is connected with the second position of the body of the electric automobile;
when the electric automobile is charged through the charging equipment, the first end of the charging equipment is connected with the third position of the automobile body of the electric automobile, the second end of the charging equipment is connected with the third end of the switching module, and the charging equipment comprises a charging protection resistor;
the micro control unit is used for controlling the switching module to selectively switch on the first network module and/or the second network module in the process of charging the electric vehicle through the charging equipment, wherein the first network module is different from the second network module, detecting a voltage value of a third end of the switching module, calculating a body ground deviation value according to the voltage value, and correcting according to the body ground deviation value to obtain an accurate charging signal, and the body ground deviation value is a potential difference value between the third position and the first position.
In one embodiment, the first network module comprises 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, and the second network module comprises 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.
In one embodiment, the first constant current source network module includes a voltage regulator device and a first resistor, wherein a first pin of the voltage regulator device is connected to the positive electrode of the power supply, a second pin of the voltage regulator device is connected to a first end of the first resistor, and a third pin of the voltage regulator device is respectively connected to a second end of the first resistor and the switching module.
In one embodiment, the second constant current source network module includes a first resistor, a transistor, a regulator device, and a second resistor, a first end of the first resistor and a negative electrode of the regulator device are connected to a positive electrode of the power supply, a second end of the first resistor is connected to an emitter of the transistor, a positive electrode of the regulator device is connected to a base of the transistor and a first end of the second resistor, respectively, a second end of the second resistor is grounded, and a collector of the transistor is connected to the switching module.
In one embodiment, the third constant current source network module comprises: a capacitor, a first resistor, a second resistor, a unidirectional conducting device, a first triode, a second triode, a voltage stabilizing device and a third 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 with the positive electrode of the power supply, the negative electrode of the capacitor is respectively connected with the collector of the first 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 with the emitter of the first triode, the second end of the second resistor is connected with the anode of the unidirectional conducting device, the negative electrode of the single-phase conducting device is respectively connected with the base electrode of the first triode and the collector electrode of the second triode, and an emitting electrode of the second triode is connected with a first end of the third resistor, and a second end of the third resistor and the anode of the voltage stabilizing device are connected with the switching module.
In one embodiment, the unidirectional conducting device comprises a diode.
In one embodiment, the fourth constant current source network module includes a voltage regulator device, a first resistor, an amplifier, a transistor, and a second resistor, wherein a negative electrode of the voltage regulator device is connected to a positive electrode of the power supply, positive electrodes of the voltage regulator device are respectively connected to a first end of the first resistor and a first end of the amplifier, a second end of the first resistor is grounded, a second end of the amplifier is respectively connected to a first end of the second resistor and an emitter of the transistor, a second end of the second resistor is connected to a positive electrode of the power supply, a third end of the amplifier is connected to a base of the transistor, and a collector of the transistor is connected to the switching module.
In one embodiment, the voltage regulator device includes a zener diode.
In a second aspect, the present application provides an in-vehicle device, which includes the charging signal detection circuit according to any one of the embodiments of the first aspect.
It can be seen that, in the present application, the charging signal detection circuit 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 an anode of the power supply is respectively connected to a first end of the first network module and a first end of the second network module, a second end of the first network module is connected to the first end of the switching module, a second end of the second network module is connected to the second end of the switching module, a third end of the switching module is connected to the first end of the micro control unit, a second end of the micro control unit is connected to a first position of a body of the electric vehicle, and a cathode of the power supply is connected to a second position of the body of the electric vehicle; when the electric automobile is charged through the charging equipment, the first end of the charging equipment is connected with the third position of the automobile body of the electric automobile, the second end of the charging equipment is connected with the third end of the switching module, and the charging equipment comprises a charging protection resistor; the micro control unit is used for controlling the switching module to selectively switch on the first network module and/or the second network module in the process of charging the electric automobile through the charging equipment, wherein the first network module is different from the second network module, the micro control unit is used for detecting the voltage value of the third end of the switching module, calculating the body ground deviation value according to the voltage value, and correcting the body ground deviation value to obtain an accurate charging signal, and the body ground deviation value is the potential difference value between the first position and the third position. It can be seen that, in the process of charging the electric vehicle through the charging equipment, the charging signal detection circuit can be selectively conducted among different network modules to detect the voltage value of the second end of the charging equipment when the second end is connected to different network modules, and the vehicle body ground offset value is determined according to the voltage when the second end is connected to different network modules, so that the actual voltage value of the charging equipment can be obtained by compensating the detected voltage value according to the vehicle body ground offset value subsequently, and then the charging signal detected according to the actual voltage value is corrected, the accuracy of the charging signal detection is improved, and the stability and the safety of the charging process of the electric vehicle are ensured.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the background art, the drawings referred to in the present application or the background art will be briefly described below.
Reference will now be made in brief to the drawings to which this application relates.
Fig. 1 is a schematic view of an application scenario of a charging signal detection circuit provided in the present application;
fig. 2 is a schematic structural diagram of a first constant current source network module provided in the present application;
fig. 3 is a schematic structural diagram of a second constant current source network module provided in the present application;
fig. 4 is a schematic structural diagram of a third constant current source network module provided in the present application;
fig. 5 is a schematic structural diagram of a fourth constant current source network module provided in the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The following are detailed below.
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions. For example, a system that includes a list of modules and devices is not limited to those listed, but may alternatively include modules and devices not listed, or may alternatively include other modules and devices inherent to such systems.
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 application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The present application is described below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of a charge signal detection circuit provided in the present application, as shown in fig. 1, the charging signal detecting circuit 110 includes a power source 1101, a first network module 1102, a second network module 1103, a switching module SW, and a micro control unit 1104, wherein the positive pole of the power source 1101 is connected to the first end of the first network module 1102 and the first end of the second network module 1103 respectively, a second terminal of the first network module 1102 is connected to a first terminal 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, the third end of the switching module SW is connected to the first end of the micro control unit 1104, the second end of the micro control unit 1104 is connected to the first position a of the body 120 of the electric vehicle, the negative electrode of the power source 1101 is connected with the second position B of the body 120 of the electric automobile;
when the electric vehicle is charged 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, the second end of the charging device 100 is connected to the third end of the switching module SW, and the charging device 100 includes a charging protection resistor RC;
the micro control unit 1104 is configured to control the switching module SW to selectively turn on the first network module 1102 and/or the second network module 1103 in a charging process of the electric vehicle by the charging apparatus 100, where the first network module 1102 is different from the second network module 1103, and is configured to detect a voltage value at a third end of the switching module SW, and to calculate a body ground offset value according to the voltage value, and correct an accurate charging signal according to the body ground offset value, where the body ground offset value is a potential difference value 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 apparatus 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, and 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 first network module 1102 and the second network module 1103 are both constant current source network modules, but the first network module 1102 and the second network module 1103 have different circuit parameters, that is, the total resistance and voltage provided by the first network module 1102 and the second network module 1103 are different.
The constant current source module is a current source module with a constant output current, and when different constant current source network modules are connected, the data values of the sampling data (including the voltage at the third end of the switching module SW and the current flowing out of the constant current source network module) obtained by the micro control unit 1104 are 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, for example, the first network module 1102 and the second network module 1103 are constant current source network modules with the same structure and different resistances of the corresponding total resistors, so that when different constant current source network modules are connected, the data values of the sampling data obtained by the micro control unit 1104 are different.
Wherein the first network module 1102 can be any 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 network module 1102 may also be a constant current source network module obtained by connecting at least two 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 in parallel, and in the same way, the second network module 1103 may be any 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 may also be a constant current source network module obtained by connecting at least two 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 in parallel.
Next, the vehicle body ground displacement in the embodiment of the present application is described in detail: in a practical application scenario, the low-voltage ground in the 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 body 120 of the electric vehicle, and the body 120 of the electric vehicle has a certain impedance when a current flows through the body 120 of the electric vehicle, which causes the ground of the charging device 100 and the ground of the charging signal detection circuit 110 to be not at the same potential after being connected to different positions of the body 120 of the electric vehicle, 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, so that the voltage value of the third end of the switching module SW detected by the micro control unit 1104 is the potential difference between the third end of the switching module SW and the first position a, and is not the potential difference between the two ends of the charging device 100, that is the voltage value of the third end of the switching module SW is the potential between the second end and the first end of the charging device 100 The difference value and the sum of the potential difference values between the third position C and the first position a, wherein the potential difference value between the third position C and the first position a is the vehicle body ground deviation value in the embodiment of the present application.
The following describes a process of determining a ground offset value of a vehicle body by the charging signal detection system 10, including step 1 and step 2.
Step 1, when the electric vehicle is charged by 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 switch on the first network module 1102, the micro control unit 1104 detects the voltage value V at the third terminal of the switching module SW1And determining the current value I of the third terminal of the switching module SW by the micro control unit 11041When the micro control unit 1104 controls the switching module SW to switch on the second network module 1103, the micro control unit 1104 detects the voltage value V at the third terminal of the switching module SW2And determining the current value I of the third terminal of the switching module SW by the micro control unit 11042(ii) a Secondly, when the first network module 1102 is turned on by the micro control unit 1104, the micro control unit 1104 detects the voltage value V at the third terminal of the switching module SW1And determining the current value I of the third terminal of the switching module SW by the micro control unit 11041When the first network module 1102 and the second network module 1103 are turned on by the micro control unit 1104, the voltage value V of the third terminal of the switching module SW is detected by the control unit 11042And determining the current value I of the third terminal of the switching module SW by the micro control unit 11042(ii) a Thirdly, when the second network module 1103 is turned on by the micro control unit 1104, the micro control unit 1104 detects the voltage value V at the third terminal of the switching module SW1And determining the current value I of the third terminal of the switching module SW by the micro control unit 11041When the first network module 1102 and the second network module 1103 are turned on by the micro control unit 1104, the voltage value V of the third terminal of the switching module SW is detected by the micro control unit 11042And determining the current value I of the third terminal of the switching module SW by the micro control unit 11042；
The controlling the switching module SW to connect the first network module 1102 and the second network module 1103 by the micro control unit 1104 means controlling the switching module SW to connect the first network module 1102 and the second network module 1103 at the same time by the micro control unit 1104, and the essence is to connect the first network module 1102 and the second network module 1103 in parallel and then to the charging signal detection circuit 110.
It should be noted that the first network module 1102 and the second network module 1103 are both constant current source network modules, and when the first network module 1102 and the second network module 1103 determine that the current values corresponding to the currents flowing through the charging device 100 in three cases of turning on only the first network module 1102, turning on only the second network module 1103, and simultaneously turning on the first network module 1102 and the second network module 1103 are stored in the micro control unit 1104 in advance, the micro control unit 1104 may determine the current values of the corresponding output currents according to the turning-on conditions of the network modules.
Step 2, according to the voltage value V1Current value I1Voltage value V2And a current value I2Determining the resistance R of the charging protection resistor RCCAnd a body ground offset value Vp；
Wherein the voltage value V1Current value I1Voltage value V2Current value I2Resistance value R of charging protection resistor RCCAnd a body ground offset value VpThe corresponding relation is as follows: v1＝RC*I1+Vp，V2＝RC*I2+VpFinally, the resistance value R of the charge protection resistor RC can be obtainedCAnd said body ground offset value Vp。
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 may be selectively turned on between different network modules to detect a voltage value of the second end of the charging device 100 when the second end is connected to different network modules, and determine a vehicle body ground offset value according to the voltage value when the different network modules are connected, so as to perform compensation on the detected voltage value according to the vehicle body ground offset value subsequently to obtain an actual voltage value between the second end and the first end of the charging device 100, and then correct the detected charging signal according to the actual voltage value, thereby improving accuracy of detection of the charging signal, and ensuring stability and safety of the charging process of the electric vehicle.
Several constant current source network modules to which the present application relates are described below.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first constant current source network module according to the present application, and as shown in fig. 2, the first constant current source network module includes: the voltage stabilizing device comprises a voltage stabilizing device and a first resistor R1, wherein the second pin of the voltage stabilizing device is connected with the first end of the first resistor R1, and the third pin of the voltage stabilizing device is connected with 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, and is connected to the anode of the power supply 1101 through the first pin of the voltage regulator.
The first pin of the voltage stabilizing device is a voltage regulating pin; the second pin is a voltage output pin; the third pin is a voltage input pin, and the voltage stabilizing device can be an LM317 chip. The current I output by the first constant current source network moduleoutI.e. the current flowing through the charging protection resistor RC, and the resistance value R of the first resistor R11The corresponding relation is as follows:
Iout＝(Vret/R1)+IAdj＝1.25V/R1；
wherein, VretIs the first resistor R1Voltage value across, IAdjThe current value of the current output by the first pin is 1.25V, and the voltage reference is between the first pin and the second pin.
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.
As can be seen, the charging signal detection circuit 110 can provide a constant current power supply by accessing the first constant current source network module.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a second constant current source network module according to the present application, as shown in fig. 3, the second constant current source network module includes a first resistor R1, a transistor, a regulator device and a second resistor R2, a second end of the first resistor R1 is connected to an emitter of the transistor, anodes of the regulator device are respectively connected to a base of the transistor and a first end of the second resistor R2, and a 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 source 1101 through the first end of the first resistor R1 and the negative electrode of the voltage regulator, and is connected to the first end or the second end of the switching module SW through the collector of the triode.
Wherein the voltage regulator device may be a voltage regulator diode.
When 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.
In this example, the charging signal detection circuit 110 can provide a constant current power supply by accessing the second constant current source network module.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a third constant current source network module according to the present application, as shown in fig. 4, the third constant current source network module comprises a capacitor, a first resistor R1, a second resistor R2, a one-way conduction device, a first triode VT1, a second triode VT2, a voltage stabilizing device and a third resistor R3, wherein the negative electrode of the capacitor is respectively connected with the collector of the first triode VT1, the base of the second triode VT2 and the negative electrode of the voltage regulator, a second end of the first resistor R1 is connected to an emitter of the first transistor VT1, a second end of the second resistor R2 is connected to an anode of the unidirectional conducting device, the negative electrode of the single-phase conducting device is respectively connected with the base electrode of the first triode VT1 and the collector electrode of the second triode VT2, and the emitter electrode of the second triode VT2 is connected with the first end of the third resistor R3.
The third constant current source network module is connected to the first terminal or the second terminal of the switching module SW through the second terminal of the third resistor R3 and the positive electrode of the voltage regulator device, and is connected to the positive electrode of the power supply 1101 through the positive electrode of the capacitor, the first terminal of the first resistor R1 and the first terminal of the second resistor R2.
Wherein the voltage regulator device may be a voltage regulator diode.
Wherein the unidirectional conducting device may be a diode.
The current flowing out of the third constant current source network module is constant current, and the current and the resistance value R of the first resistor R11The corresponding relation is as follows: i ═ 2 x 2.5R1In the case where the resistance value R1 of the first resistor R1 is determined, the current flowing out of the third constant current source network module is constant.
In this example, the charging signal detection circuit 110 provides a constant current power supply by accessing the third constant current source network module.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a fourth constant current source network module according to the present application, and as shown in fig. 5, the fourth constant current source network module includes: the power supply comprises a voltage stabilizing device, a first resistor R1, an amplifier, a triode and a second resistor R2, wherein the anode of the voltage stabilizing device is respectively connected with the first end of the first resistor R1 and the first end of the amplifier, the second end of the first resistor R1 is grounded, the second end of the amplifier is respectively connected with the first end of the second resistor R2 and the emitter of the triode, the second end of the second resistor R2 is connected with the anode of the power supply 1101, and the third end of the amplifier is connected with the base of the triode.
The fourth constant current source network module is connected to the positive electrode of the power source 1101 through the negative electrode of the voltage regulator and the second end of the second resistor R2, and is connected to the first end or the second end of the switching module SW through the collector of the triode.
Wherein the voltage regulator device may be a voltage regulator diode.
When the resistance of the first resistor R1 is constant, the voltages of the anode of the voltage regulator, the first end of the first resistor R1 and the first end of the amplifier are constant, at this time, the voltage drop across the second resistor 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.
In this example, the charging signal detection circuit 110 provides a constant current power supply by accessing a fourth constant current source network module.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a first constant current source network module shown in fig. 2, and the second network module 1103 is a second constant current source network module shown in fig. 3.
As can be seen, in this example, the charging signal detection circuit 110 is configured with a first constant current source network module and a second constant current source network module, and acquires different sampling data under the condition that the first constant current source network module and/or the second constant current source network module are selected to be connected, so as to obtain the resistance value of the charging protection resistor RC and the body-ground offset value.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a third constant current source network module shown in fig. 4, and the second network module 1103 is a fourth constant current source network module shown in fig. 5.
As can be seen, in this example, the charging signal detection circuit 110 is configured with a third constant current source network module and a fourth constant current source network module, and acquires different sampling data under the condition that the third constant current source network module and/or the fourth constant current source network module are selected to be connected, so as to obtain the resistance value of the charging protection resistor RC and the body-ground offset value.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a first constant current source network module shown in fig. 2, and the second network module 1103 is a third constant current source network module shown in fig. 4.
As can be seen, in this example, the charging signal detection circuit 110 is configured with the first constant current source network module and the third constant current source network module, and under the condition that the first constant current source network module and/or the third constant current source network module are selected to be connected, acquires different sampling data, and obtains the resistance value of the charging protection resistor RC and the body-ground offset value.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a first constant current source network module shown in fig. 2, and the second network module 1103 is a fourth constant current source network module shown in fig. 5.
As can be seen, in this example, the charging signal detection circuit 110 is configured with the first constant current source network module and the fourth constant current source network module, and acquires different sampling data under the condition that the first constant current source network module and/or the fourth constant current source network module are selected to be connected, so as to obtain the resistance value of the charging protection resistor RC and the body-ground offset value.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a second constant current source network module shown in fig. 3, and the second network module 1103 is a third constant current source network module shown in fig. 4.
As can be seen, in this example, the charging signal detection circuit 110 acquires different sampling data by providing the second constant current source network module and the third constant current source network module under the condition that the second constant current source network module and/or the third constant current source network module are/is selected to be connected, so as to obtain the resistance value of the charging protection resistor RC and the body-ground offset value.
In a possible embodiment, in the charging signal detecting circuit 110, the first network module 1102 is a second constant current source network module shown in fig. 3, and the second network module 1103 is a fourth constant current source network module shown in fig. 5.
As can be seen, in this example, the charging signal detection circuit 110 is configured with the second constant current source network module and the fourth constant current source network module, and acquires different sampling data under the condition that the second constant current source network module and/or the fourth constant current source network module are selected to be connected, so as to obtain the resistance value of the charging protection resistor RC and the body-ground offset value.
The present application also provides an in-vehicle device, wherein the in-vehicle device includes any one of the charging signal detection circuits described in the above embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application with specific examples, and the above description of the embodiments is only provided to help understand the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific implementation and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (9)

1. A charging signal detection circuit is characterized by being applied to an electric automobile and comprising a power supply, a first network module, a second network module, a switching module and a micro control unit, wherein,
the positive electrode of the power supply is respectively connected with 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 with the first end of the switching module, the second end of the second network module is connected with the second end of the switching module, the third end of the switching module is connected with the first end of the micro control unit, the second end of the micro control unit is connected with the first position of the body of the electric automobile, and the negative electrode of the power supply is connected with the second position of the body of the electric automobile;
when the electric automobile is charged through the charging equipment, the first end of the charging equipment is connected with the third position of the automobile body of the electric automobile, the second end of the charging equipment is connected with the third end of the switching module, and the charging equipment comprises a charging protection resistor;
the micro control unit is used for controlling the switching module to selectively switch on the first network module and/or the second network module in the process of charging the electric vehicle through the charging equipment, wherein the first network module is different from the second network module, detecting a voltage value of a third end of the switching module, calculating a body ground deviation value according to the voltage value, and correcting according to the body ground deviation value to obtain an accurate charging signal, and the body ground deviation value is a potential difference value between the third position and the first position.
2. The charging signal detection circuit according to claim 1, wherein the first network module comprises 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, and the second network module comprises 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.
3. The charging signal detection circuit of claim 2, wherein the first constant current source network module comprises a voltage regulator and a first resistor, wherein a first pin of the voltage regulator is connected to the positive electrode of the power supply, a second pin of the voltage regulator is connected to a first end of the first resistor, and a third pin of the voltage regulator is connected to a second end of the first resistor and the switching module, respectively.
4. The charging signal detection circuit according to claim 2, wherein the second constant current source network module comprises a first resistor, a transistor, a regulator device, and a second resistor, a first end of the first resistor and a negative electrode of the regulator device are connected to a positive electrode of the power supply, a second end of the first resistor is connected to an emitter of the transistor, a positive electrode of the regulator device is connected to a base of the transistor and a first end of the second resistor, respectively, a second end of the second resistor is grounded, and a collector of the transistor is connected to the switching module.
5. The charging signal detection circuit of claim 2, wherein the third constant current source network module comprises: a capacitor, a first resistor, a second resistor, a unidirectional conducting device, a first triode, a second triode, a voltage stabilizing device and a third 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 with the positive electrode of the power supply, the negative electrode of the capacitor is respectively connected with the collector of the first 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 with the emitter of the first triode, the second end of the second resistor is connected with the anode of the unidirectional conducting device, the negative electrode of the single-phase conducting device is respectively connected with the base electrode of the first triode and the collector electrode of the second triode, and an emitting electrode of the second triode is connected with a first end of the third resistor, and a second end of the third resistor and the anode of the voltage stabilizing device are connected with the switching module.
6. The charge signal detection circuit of claim 5, wherein the unidirectional conducting device comprises a diode.
7. The charging signal detection circuit according to claim 2, wherein the fourth constant current source network module comprises a voltage regulator device, a first resistor, an amplifier, a transistor, and a second resistor, wherein a negative electrode of the voltage regulator device is connected to a positive electrode of the power supply, positive electrodes of the voltage regulator device are respectively connected to a first terminal of the first resistor and a first terminal of the amplifier, a second terminal of the first resistor is grounded, a second terminal of the amplifier is respectively connected to a first terminal of the second resistor and an emitter of the transistor, a second terminal of the second resistor is connected to a positive electrode of the power supply, a third terminal of the amplifier is connected to a base of the transistor, and a collector of the transistor is connected to the switching module.
8. The charge signal detection circuit according to any of claims 4 to 7, wherein the voltage regulator device comprises a voltage regulator diode.
9. An in-vehicle apparatus characterized by comprising the charging signal detection circuit according to any one of claims 1 to 8.
CN202080015912.XA 2020-09-21 2020-09-21 Charging signal detection circuit and vehicle-mounted equipment Active CN114007897B (en)

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200818101A (en) * 2006-10-11 2008-04-16 Innolux Display Corp Voltage stabilizing circuit
CN203012568U (en) * 2012-12-26 2013-06-19 泉州豪杰信息科技发展有限公司 Constant current source circuit for global position system (GPS) device
CN105408171A (en) * 2013-07-24 2016-03-16 布罗泽汽车部件制造哈尔施塔特有限公司 Circuit module for isolating components of a multi-voltage vehicle electrical system
CN107636634A (en) * 2015-06-26 2018-01-26 英特尔公司 The alleviation of the variation of charging sensing
CN207530522U (en) * 2017-11-27 2018-06-22 福建星海通信科技有限公司 A kind of circuit with resistance to ground offset and high electrostatic protection
CN108475248A (en) * 2015-12-09 2018-08-31 高通股份有限公司 In response to USB2 physical layer interface transceivers（PHY）It is transformed into high-speed mode and the differential data line of the PHY is capacitively coupled to the one or more components of high-speed module
CN108896823A (en) * 2018-07-23 2018-11-27 欣旺达电动汽车电池有限公司 A kind of method of charging resistor detection
DE102017113533A1 (en) * 2017-06-20 2018-12-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Method and apparatus for compensating for mass offset in a high voltage vehicle system
CN209673895U (en) * 2019-01-26 2019-11-22 比亚迪股份有限公司 A kind of type insulation monitoring system and vehicle
CN111665453A (en) * 2019-03-07 2020-09-15 神讯电脑(昆山)有限公司 Grounding deviation test system
CN213364907U (en) * 2020-09-21 2021-06-04 深圳欣锐科技股份有限公司 Charging signal detection circuit and vehicle-mounted equipment

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200818101A (en) * 2006-10-11 2008-04-16 Innolux Display Corp Voltage stabilizing circuit
CN203012568U (en) * 2012-12-26 2013-06-19 泉州豪杰信息科技发展有限公司 Constant current source circuit for global position system (GPS) device
CN105408171A (en) * 2013-07-24 2016-03-16 布罗泽汽车部件制造哈尔施塔特有限公司 Circuit module for isolating components of a multi-voltage vehicle electrical system
CN107636634A (en) * 2015-06-26 2018-01-26 英特尔公司 The alleviation of the variation of charging sensing
CN108475248A (en) * 2015-12-09 2018-08-31 高通股份有限公司 In response to USB2 physical layer interface transceivers（PHY）It is transformed into high-speed mode and the differential data line of the PHY is capacitively coupled to the one or more components of high-speed module
DE102017113533A1 (en) * 2017-06-20 2018-12-20 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Method and apparatus for compensating for mass offset in a high voltage vehicle system
CN207530522U (en) * 2017-11-27 2018-06-22 福建星海通信科技有限公司 A kind of circuit with resistance to ground offset and high electrostatic protection
CN108896823A (en) * 2018-07-23 2018-11-27 欣旺达电动汽车电池有限公司 A kind of method of charging resistor detection
CN209673895U (en) * 2019-01-26 2019-11-22 比亚迪股份有限公司 A kind of type insulation monitoring system and vehicle
CN111665453A (en) * 2019-03-07 2020-09-15 神讯电脑(昆山)有限公司 Grounding deviation test system
CN213364907U (en) * 2020-09-21 2021-06-04 深圳欣锐科技股份有限公司 Charging signal detection circuit and vehicle-mounted equipment

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