CN113330323B - Contactor state detection circuit, system and vehicle - Google Patents
Contactor state detection circuit, system and vehicle Download PDFInfo
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- CN113330323B CN113330323B CN202080008548.4A CN202080008548A CN113330323B CN 113330323 B CN113330323 B CN 113330323B CN 202080008548 A CN202080008548 A CN 202080008548A CN 113330323 B CN113330323 B CN 113330323B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- 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
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Abstract
The contactor state detection circuit (20), the system (60) and the vehicle are characterized in that the contactor state detection circuit (20) comprises a first power supply (200), a first contactor (201), a current signal detector (202) and a voltage acquisition unit (203), one end of the first power supply (200) is connected with one end of the first contactor (201), and the first contactor (201) is connected in series between a charging interface (21) and a battery (22); the other end of the first power supply (200) is connected with a first end of the current signal detector (202); a second end of the current signal detector (202) is connected with the other end of the first contactor (201), and a third end of the current signal detector (202) is used for outputting a voltage signal representing the opening and closing state of the first contactor (201); the third end of the current signal detector (202) is connected with the voltage acquisition unit (203), and the voltage acquisition unit (203) is used for determining the state of the first contactor (201) according to the voltage signal output by the current signal detector (202), and the state of the first contactor (201) is detected through the output voltage of the current signal detector (202), so that the state of the contactor is accurately judged.
Description
Technical Field
The application relates to the field of electric automobiles, in particular to a contactor state detection circuit, a contactor state detection system and a vehicle.
Background
The contactor is a switching device which uses a magnetic field generated by a current flowing through a coil to close the contact, and when the coil is de-energized, electromagnetic attraction disappears to open the contact. In the high-current charging apparatus, a contactor is disposed between the battery and the charging interface, and a specific connection is shown in fig. 1, and functions as an isolation after stopping charging and as a connection when charging.
Along with electric automobile's development, electric automobile's charge rate is higher and higher, and charging current also is bigger and bigger, and the frequent circumstances of adhesion appears in the contactor, when the contactor took place the adhesion, can't break the contact of contactor through the coil outage, because the contact closure of contactor like this the interface that charges, at the state moment and the battery intercommunication that do not charge, lead to battery voltage to reflect on the interface that charges, the interface moment that charges is in the high-pressure state promptly, has brought very big potential safety hazard like this.
Disclosure of Invention
The application provides a contactor state detection circuit, a system and a vehicle, which can accurately judge the state of a contactor.
In a first aspect, embodiments of the present application provide a contactor status detection circuit, the contactor status detection circuit including a first power supply, a first contactor, a current signal detector, and a voltage acquisition unit, wherein:
one end of the first power supply is connected with one end of the first contactor, and the first contactor is connected in series between the charging interface and the battery;
the other end of the first power supply is connected with the first end of the current signal detector;
the second end of the current signal detector is connected with the other end of the first contactor, and the third end of the current signal detector is used for outputting a voltage signal representing the opening and closing state of the first contactor;
the third end of the current signal detector is connected with the voltage acquisition unit, and the voltage acquisition unit is used for determining the state of the first contactor according to the voltage signal output by the current signal detector.
In one possible embodiment, the contactor status detection circuit further comprises a second contactor having a mechanical linkage relationship with the first contactor and a second power source;
one end of the second contactor is connected with the second power supply, and the other end of the second contactor is connected with the voltage acquisition unit.
In one possible implementation, the contactor status detection circuit further includes a constant current source including an input and an output;
the other end of the first power supply is connected with the first end of the current signal detector, and the first end is:
the other end of the first power supply is connected with the input end of the constant current source, the output end of the constant current source is connected with the first end of the current signal detector, and the constant current source is used for providing constant current for the current signal detector.
In another possible implementation, the contactor status detection circuit further includes at least one resistor through which the other end of the first power supply is connected in series to the first end of the current signal detector.
Further, the contactor state detection circuit further comprises a switching tube and a battery management unit;
the first contactor is connected in series between the charging interface and the battery, and is:
one end of the first contactor is connected with the charging interface, the other end of the first contactor is connected with the first end of the switching tube, the second end of the switching tube is connected with the battery, the third end of the switching tube is connected with the battery management unit, and the battery management unit is used for controlling the on-off of the switching tube according to a voltage signal representing the on-off state of the first contactor.
Optionally, the current signal detector includes any one of a hall current sensor, a current transformer and/or a sampling resistor.
Further, the contactor state detection circuit further comprises a protection unit, one end of the protection unit is connected with the output end of the constant current source, the other end of the protection unit is connected with the first end of the current signal detector, and the protection unit is used for protecting the contactor state detection circuit when the voltage at two ends of the first contactor reaches a preset threshold value.
Optionally, the protection unit is a field effect transistor, and the contactor state detection circuit further includes a battery management unit;
one end of the protection unit is connected with the output end of the constant current source, and the other end of the protection unit is connected with the first end of the current signal detector, wherein the first end is as follows:
the drain electrode of the field effect tube is connected with the output end of the constant current source, and the source electrode of the field effect tube is connected with the first end of the current signal detector;
and the grid electrode of the field effect transistor is connected with the battery management unit.
In a second aspect, embodiments of the present application also provide a contactor status detection system that includes a charging interface, a battery, and any one of the possible contactor status detection circuits described above.
In a third aspect, embodiments of the present application also provide a vehicle including any one of the possible contactor status detection circuits described above.
The contactor state detection circuit in this application includes first power, first contactor, current signal detector and voltage acquisition unit, wherein: one end of the first power supply is connected with one end of the first contactor, and the first contactor is connected in series between the charging interface and the battery; the other end of the first power supply is connected with the first end of the current signal detector; the second end of the current signal detector is connected with the other end of the first contactor, and the third end of the current signal detector is used for outputting a voltage signal representing the opening and closing state of the first contactor; the third end of the current signal detector is connected with the voltage acquisition unit, and the voltage acquisition unit is used for determining the state of the first contactor according to the voltage signal output by the current signal detector. According to the method and the device, the state of the first contactor is detected through the output voltage of the current signal detector, if the voltage acquisition unit acquires that the current signal detector does not have the output voltage, the first contactor can be determined to be disconnected, and if the voltage acquisition unit acquires that the current signal detector has the voltage output, the first contactor can be determined to be in a closed state, so that the state of the contactor is accurately judged.
Drawings
Fig. 1 is a block diagram of a contactor application provided in an embodiment of the present application;
fig. 2 is a block diagram of a contactor status detection circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a contactor status detection circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another contactor status detection circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of yet another contactor status detection circuit provided in an embodiment of the present application;
fig. 6 is a block diagram of a contactor status detection system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The implementation of the technical solution of the present application is described in further detail below with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a block diagram of a contactor status detection circuit according to an embodiment of the present application. As shown in fig. 2, the contactor status detection circuit 20 includes a first power supply 200, a first contactor 201, a current signal detector 202, and a voltage acquisition unit 203, wherein:
one end of the first power supply 200 is connected with one end of the first contactor 201, and the first contactor 201 is connected in series between the charging interface 21 and the battery 22;
the other end of the first power supply 200 is connected to a first end of the current signal detector 202;
a second end of the current signal detector 202 is connected to the other end of the first contactor 201, and a third end of the current signal detector 202 is used for outputting a voltage signal representing an open/close state of the first contactor 201;
the third terminal of the current signal detector 202 is connected to the voltage acquisition unit 203, and the voltage acquisition unit 203 is configured to determine the state of the first contactor 201 according to the voltage signal output by the current signal detector 202.
Specifically, the first power supply 200 is configured to provide an operating voltage to the current signal detector 202, and optionally, the first power supply 200 may be a constant voltage source. The current signal detector 202 may include any of a hall current sensor, a current transformer, and/or a sampling resistor. Taking the hall current sensor as an example, the hall current sensor is a component utilizing the hall effect principle, the current Ic is introduced from the control current end of the element, the control current end is the first end and the second end of the current signal detector 202, and a magnetic field with magnetic induction intensity B is applied in the normal direction of the plane of the element, so that a potential VH is generated in the direction perpendicular to the current and the magnetic field (i.e., between the output ends), and the output end is the third end of the sensor 202. The voltage acquisition unit 203 may be an integrated chip with Analog-to-Digital Converter (ADC) functionality, such as a central processing unit (central processing unit, CPU), digital signal processor (digital signal processor, DSP), application specific integrated circuit (application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field-programmable gate array, FPGA) or other transistor logic device, etc. Alternatively, the current signal detector 202 may be a sampling resistor connected in series to the contactor status detection circuit 20, and configured to collect a loop current of the contactor status detection circuit 20, where when the first contactor 201 is closed, the contactor status detection circuit 20 has a loop current, and the voltage collection unit 203 collects voltages across the sampling resistor, and if it is collected that voltages across the resistor have voltages, it is determined that the first contactor 201 is in a closed state.
The principle of the contactor status detection circuit 20 is as follows:
the first power supply 200, the first contactor 201, and the current signal detector 202 form a closed loop, and the current signal detector 202 collects loop current in the closed loop and outputs a voltage signal when current is collected. When the first contactor 201 is in an open state, no current flows in the closed loop, i.e. no current is collected by the current signal detector 202, and no voltage signal is output; when the first contactor 201 is in a closed state, a current flows in the closed loop, and the current signal detector 202 collects the current, thereby outputting a voltage signal. The voltage acquisition unit 203 acquires the output voltage of the current signal detector 202, if the voltage acquisition unit 203 acquires that the current signal detector 202 has the output voltage, that is, the current signal detector 202 outputs a high level, the voltage acquisition unit 203 determines that the first contactor 201 is in a closed state; if the voltage acquisition unit 203 acquires that the current signal detector 202 does not output voltage, that is, the current signal detector 202 outputs a low level, the voltage acquisition unit 203 determines that the first contactor 201 is in an open state.
Further, the voltage acquisition unit 203 may determine whether the first contactor 201 is in the blocking state or the normally closed state according to the state of the first contactor 201 and whether the charging interface 21 has an insertion signal. For example, the charging interface 21 has a plug-in signal representing that an external device is charging the battery 22, and the first contactor 201 is in a normally closed state; if the charging interface 21 has no signal inserted, that is, it means that the external device is not charging the battery 22, the first contactor 201 should be in an open state, and if the first contactor 201 is in a closed state, it means that the contacts of the first contactor 201 are stuck, that is, the first contactor 201 is in a stuck state. Alternatively, the insertion signal may be sent by the charging interface 21, that is, the charging interface 21 has a function of detecting the insertion of an external device.
The block diagram of fig. 2 is described below in connection with specific components. Referring to fig. 3, fig. 3 is a schematic diagram of a contactor status detection circuit according to an embodiment of the present application. As shown in fig. 3, the first contactor KM1 is connected in series between the charging interface 31 and the battery 32, one end of the first power supply U1 is connected to the first end of the current sensor S1, and the positive electrode or the negative electrode of the first power supply U1 may be connected to the first end of the current signal detector S1, where no limitation is made on whether the positive electrode or the negative electrode of the power supply is connected to the first end of the current signal detector S1. Taking the example that the positive electrode of the first power supply U1 is connected to the first end of the current signal detector S1, the negative electrode of the first power supply U1 is connected to one end of the first contactor KM1, and the second end of the current signal detector S1 is connected to the other end of the first contactor KM 1. It should be noted that, the contactor includes two parts, one part is a contact part, the other part is a coil part, and the coil part is used for generating a magnetic field according to current so as to attract the contact to be attracted, and the connection relation of the contactor in this application is not limited to the connection relation of the coil part. The third end of the current signal detector S1 is connected with a voltage acquisition unit Q1, the voltage acquisition unit Q1 is configured to acquire an output voltage of the current signal detector S1, if the first contactor KM1 is in a closed state, a current is generated in a closed loop formed by the first power supply U1, the current signal detector S1 and the first contactor KM1, and the current signal detector S1 outputs a voltage signal; if the first contactor KM1 is in an open state, the first power supply U1, the current signal detector S1, and the first contactor KM1 do not form a closed loop, and the current signal detector S1 does not output a voltage signal. The voltage acquisition unit Q1 determines the open-close state of the first contactor KM1 according to whether the current signal detector S1 outputs a voltage signal.
In a possible embodiment, to exclude other factors in the circuit from interfering with the output of the current signal detector voltage signal, a constant current source is connected to the contactor status detection circuit, which includes an input terminal and an output terminal, based on the description above in connection with fig. 3. Specifically, referring to fig. 4, fig. 4 is a schematic diagram of another contactor status detection circuit according to an embodiment of the present application. As shown in fig. 4, the other end of the first power supply U2 is connected to the input end of the constant current source i1, the output end of the constant current source i1 is connected to the first end of the current signal detector S2, and the constant current source i1 is configured to provide a constant current to the current signal detector S2. When the first contactor KM2 is in the closed state, it is ensured that the current signal detector S2 can detect current, so that voltage signals can be output according to the detected current, and the situation that when the first contactor KM2 is closed, current cannot be detected by the current signal detector S2 due to current division or interference of other circuits, and erroneous judgment occurs is avoided.
In another possible embodiment, in order to protect the closed loop formed by the first power supply, the first contactor and the current signal detector, at least one resistor is connected in the contactor detection circuit, and the other end of the first power supply U1 is connected in series to the first end of the current signal detector S1 through the at least one resistor, based on the description above with reference to fig. 3. Specifically, in the embodiment described above in connection with fig. 3, the first power supply U1 directly provides the voltage to the current signal detector S1, the voltage of the first power supply U1 generates a current through the electric wire therebetween and the internal resistance of the current signal detector S1, and the internal resistance of the current signal detector S1 and the wiring resistance between the first power supply U1 and the current signal detector S1 are generally not large, so that the embodiment is implemented, at least one resistor is connected to the contactor status detection circuit 30, so that the closed loop circuit currents of the first power supply U1, the first contactor KM1 and the current signal detector S1 can be reduced, and the reliability of the contactor status detection circuit is improved.
Further, in the embodiment described above in connection with fig. 4, the contactor status detection circuit further includes a switch tube and a battery management unit, as shown in fig. 4, one end of the first contactor KM2 is connected to the charging interface 41, the other end of the first contactor KM2 is connected to the first end of the switch tube K1, the second end of the switch tube K1 is connected to the battery 42, the third end of the switch tube K1 is connected to the battery management unit Q3, and the battery management unit Q3 is configured to control on-off of the switch tube K1 according to a voltage signal indicating an on-off state of the first contactor KM 2. Specifically, the battery management unit Q3 and the voltage acquisition unit Q2 may be units integrated in the same integrated chip, and the battery management unit Q3 is configured to output a control signal to the switching tube K1 according to a voltage signal acquired by the voltage acquisition unit Q2. The switch tube K1 is an fet, the fet is turned off when the battery management unit Q3 outputs a high level, and the fet is turned on when the battery management unit Q3 outputs a low level, when the voltage acquisition unit Q2 acquires a voltage output signal, it represents that the first contactor KM2 is in a closed state, further, whether the first contactor KM2 is in an adhesion state may also be determined by combining an insertion signal sent by the charging interface 41, and the specific implementation process may refer to the embodiment described in connection with fig. 2, which is not described herein. The battery management unit Q3 outputs a high level to the switch tube K1, and the switch tube K1 is disconnected, because the first contactor KM2 and the switch tube K1 are in a series connection, when the switch tube K1 is in an open state, even if the first contactor KM2 is in a closed state, the charging interface 41 and the battery 42 are not connected together, so that the voltage of the charging interface 41 can be reduced to zero, instead of the battery voltage, and the use safety of the charging interface is greatly improved.
Still further, the contactor status detection circuit 40 further includes a protection unit, one end of the protection unit is connected to the output end of the constant current source, the other end of the protection unit is connected to the first end of the current signal detector, and the protection unit is configured to protect the contactor status detection circuit when the voltage at two ends of the first contactor reaches a preset threshold value. Illustratively, as shown in fig. 4, the protection unit is a field effect transistor Q1. Optionally, the drain electrode of the field-effect transistor Q1 is connected to the output end of the constant current source i1, the source electrode of the field-effect transistor Q1 is connected to the first end of the current signal detector S2, the gate electrode of the field-effect transistor Q1 is connected to the battery management unit Q3, and the battery management unit Q3 is configured to output a voltage signal to the field-effect transistor Q1 when the voltage at two ends of the first contactor KM2 is greater than a preset threshold, so as to control the disconnection of the field-effect transistor Q1, thereby disconnecting the contactor state detection circuit 40. By implementing the embodiment, the contactor state detection circuit can be disconnected under the condition that the voltage at the two ends of the first contactor is too high, so that the use safety of the contactor state detection circuit is improved.
In order to further improve the reliability of the state detection of the first contactor, based on the description above in connection with fig. 3, the present application may further determine the state of the first contactor by performing state detection on a second contactor having a mechanical linkage relationship with the first contactor. In one possible implementation, referring to fig. 5, fig. 5 is a schematic diagram of still another contactor status detection circuit provided in an embodiment of the present application. As shown in fig. 5, the contactor status detection circuit 50 includes a first power supply U3, a first contactor KM3, a current signal detector S3, and the voltage acquisition unit Q4, and the specific implementation process may refer to the embodiment described above in conjunction with fig. 3, which is not described herein. Optionally, the contactor status detection circuit 50 may further include a constant current source i2, further, the contactor status detection circuit 50 may further include a switching tube K2 and a battery management unit Q5, and the specific implementation process may refer to the embodiment described above in connection with fig. 4, which is not described herein.
The contactor status detection circuit 50 further includes a second contactor KM4 and a second power supply U4, where the second contactor KM4 and the first contactor KM3 have a mechanical linkage relationship; one end of the second contactor KM4 is connected with the second power supply U4, and the other end of the second contactor KM4 is connected with the voltage acquisition unit Q4. Specifically, the voltages of the first power supply U3 and the second power supply U4 may be the same, and the second contactor KM4 and the first contactor KM3 have a mechanical linkage relationship, so that it is known that the open-close states of the second contactor KM4 and the first contactor KM3 have an association relationship. For example, the first contactor KM3 and the second contactor KM4 are in the same state, i.e. the first contactor KM3 is in a closed state, and the second contactor KM4 is also closed; for example, the first contactor KM3 is in the same opposite state as the second contactor KM4, i.e., the first contactor KM3 is in the closed state and the second contactor KM4 is in the open state. Taking the state of the first contactor KM3 and the state of the second contactor KM4 as an example for description, when the first contactor KM3 is closed, the second contactor KM4 is closed, the voltage of the second power supply U4 is transmitted to the voltage acquisition unit Q4 through the second contactor KM4, and the voltage acquisition unit Q4 determines that the second contactor KM4 is in a closed state according to that the voltage acquired by the second contactor KM4 is in a high level, thereby determining that the first contactor KM3 is in a closed state. Alternatively, it may be determined that the first contactor KM3 is in the closed state according to the voltage collecting unit Q4 collecting that any one of the voltage of the second contactor KM4 or the output voltage signal of the current signal detector S3 is at a high level. In this embodiment, the reliability of the state detection of the first contactor KM3 is further improved by increasing the state detection of the second contactor KM4 having a mechanical linkage relationship with the first contactor KM 3.
Referring to fig. 6, fig. 6 is a block diagram of a contactor status detection system according to an embodiment of the present application. As shown in fig. 6, the contactor status detection system 60 includes a charging interface 600, a battery 602, and any one of the possible contactor status detection circuits 601 described above in connection with fig. 1 to 5, wherein the contactor status detection circuit 601 includes at least one contactor, the charging interface 600 is configured to receive a charging current of an external device, and the contactor in the contactor status detection circuit 601 is configured to connect the charging interface 600 and the battery 602, so that the charging current of the external device may be provided to the battery 602. The contactor status detection circuit 601 is configured to detect an open/close status of a contactor connected in series between the charging interface 600 and the battery 602.
In one possible application scenario, embodiments of the present application also provide a vehicle including any one of the possible contactor status detection circuits described above in connection with fig. 1-5.
It should be noted that the above-described terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It will be appreciated that the examples corresponding to fig. 1 to 5 are only for explaining the embodiments of the present application, and should not be construed as limiting, and that in alternative implementations, fig. 1 and 5 may also have other implementations, for example, the voltage acquisition unit and the battery management unit may be integrated into one unit, etc., which are not listed here.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), or the like.
The foregoing disclosure is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the claims herein, as the equivalent of the claims herein shall be construed to fall within the scope of the claims herein.
Claims (8)
1. The contactor state detection circuit is characterized by comprising a first power supply, a constant current source, a second power supply, a first contactor, a second contactor, a current signal detector and a voltage acquisition unit, wherein the first power supply is a constant voltage source;
one end of the first power supply is connected with one end of the first contactor, and the first contactor is connected in series between the charging interface and the battery;
the other end of the first power supply is connected with the input end of the constant current source, and the output end of the constant current source is connected with the first end of the current signal detector; the constant current source is used for providing constant current to the current signal detector;
the second end of the current signal detector is connected with the other end of the first contactor, and the third end of the current signal detector is used for outputting a voltage signal representing the opening and closing state of the first contactor;
the second contactor and the first contactor are in mechanical linkage relation; one end of the second contactor is connected with the second power supply;
the third end of the current signal detector and the other end of the second contactor are connected with the voltage acquisition unit, and the voltage acquisition unit is used for determining the state of the first contactor according to the voltage signal output by the current signal detector or according to the state of the second contactor.
2. The contactor status detection circuit of claim 1, further comprising at least one resistor through which the other end of the first power supply is connected in series to the first end of the current signal detector.
3. The contactor status detection circuit according to claim 1, further comprising a switching tube and a battery management unit;
the first contactor is connected in series between the charging interface and the battery, and is:
one end of the first contactor is connected with the charging interface, the other end of the first contactor is connected with the first end of the switching tube, the second end of the switching tube is connected with the battery, the third end of the switching tube is connected with the battery management unit, and the battery management unit is used for controlling the on-off of the switching tube according to a voltage signal representing the on-off state of the first contactor.
4. A contactor status detection circuit according to any of claims 1-3, wherein the current signal detector comprises any of a hall current sensor, a current transformer and/or a sampling resistor.
5. The contactor status detection circuit according to claim 1, further comprising a protection unit;
the output end of the constant current source is connected with the first end of the current signal detector, and the first end is:
one end of the protection unit is connected with the output end of the constant current source, the other end of the protection unit is connected with the first end of the current signal detector, and the protection unit is used for protecting the contactor state detection circuit when the voltage at the two ends of the first contactor reaches a preset threshold value.
6. The contactor status detection circuit according to claim 5, wherein the protection unit is a field effect transistor, the contactor status detection circuit further comprising a battery management unit;
one end of the protection unit is connected with the output end of the constant current source, and the other end of the protection unit is connected with the first end of the current signal detector, wherein the first end is as follows:
the drain electrode of the field effect tube is connected with the output end of the constant current source, and the source electrode of the field effect tube is connected with the first end of the current signal detector;
and the grid electrode of the field effect transistor is connected with the battery management unit.
7. A contactor status detection system comprising a charging interface, a battery, and the contactor status detection circuit of any of claims 1-6.
8. A vehicle characterized in that it comprises the contactor status detection circuit according to any one of claims 1 to 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/122587 WO2022082527A1 (en) | 2020-10-21 | 2020-10-21 | Contactor state detecting circuit, system and vehicle |
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| Publication Number | Publication Date |
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| CN113330323A CN113330323A (en) | 2021-08-31 |
| CN113330323B true CN113330323B (en) | 2023-07-21 |
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| CN202080008548.4A Active CN113330323B (en) | 2020-10-21 | 2020-10-21 | Contactor state detection circuit, system and vehicle |
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| WO (1) | WO2022082527A1 (en) |
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|---|---|---|---|---|
| CN113866645A (en) * | 2021-09-07 | 2021-12-31 | 上海德朗能电子科技有限公司 | Rechargeable battery, fault detection method and device of contactor, and storage medium |
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2020
- 2020-10-21 CN CN202080008548.4A patent/CN113330323B/en active Active
- 2020-10-21 WO PCT/CN2020/122587 patent/WO2022082527A1/en active Application Filing
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| WO2022082527A1 (en) | 2022-04-28 |
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