CN213482399U - Main and negative relay on-off state detection system - Google Patents
Main and negative relay on-off state detection system Download PDFInfo
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- CN213482399U CN213482399U CN202022366376.8U CN202022366376U CN213482399U CN 213482399 U CN213482399 U CN 213482399U CN 202022366376 U CN202022366376 U CN 202022366376U CN 213482399 U CN213482399 U CN 213482399U
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Abstract
The utility model provides a main negative relay on-off state detection system, including first return circuit, detection circuitry and treater, the first return circuit includes power, load and main negative relay, detection circuitry includes first resistance, second resistance and third resistance; the processor is connected with the detection circuit and used for detecting the voltage in the detection circuit and determining the working state of the main and negative relays corresponding to the voltage according to the mapping relation between the voltage and the working state of the main and negative relays, wherein the working state comprises on and off. The utility model provides a main negative relay state detecting system that opens and shuts detects the state of opening and shutting of connecting at the main negative relay of power negative pole end through detection circuitry to ensure the normal work of relay owner negative relay.
Description
Technical Field
The utility model belongs to the technical field of electric automobile, concretely relates to main negative relay state detecting system that opens and shuts.
Background
The conventional hybrid electric vehicle or electric vehicle partially or completely utilizes electric energy as a power source, so that the conventional hybrid electric vehicle or electric vehicle is provided with a high-pressure loop, and the on-off of the high-pressure loop is controlled by attracting a relay in the high-pressure loop in order to ensure the operation safety. Therefore, whether the relay can be normally opened or closed is very important, and if the relay is not normally closed when the electric automobile is driven, the dynamic property of the whole automobile is influenced, and even the electric automobile cannot be normally driven; if the relay can not be normally switched off, electric energy is wasted, and therefore detection of the state of the relay is very important.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a main negative relay state detecting system that opens and shuts. The specific technical scheme is as follows.
A main and negative relay on-off state detection system comprises a first loop, a detection circuit and a processor, wherein the first loop comprises a power supply, a load and a main and negative relay, the positive pole of the power supply is connected with the positive pole of the load, the negative pole of the load is connected with the positive pole of the main and negative relay, and the negative pole of the main and negative relay is connected with the negative pole of the power supply;
the detection circuit comprises a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is connected with a positive electrode of the power supply and a positive electrode of the load, a second end of the first resistor is connected with a first end of the second resistor and a first end of the third resistor, a second end of the second resistor is connected with a negative electrode of the power supply and a negative electrode of the main negative relay, and a second end of the third resistor is connected with a positive electrode of the main negative relay and a negative electrode of the load;
the processor is connected with the detection circuit and used for detecting the voltage in the detection circuit and determining the working state of the main and negative relays corresponding to the voltage according to the mapping relation between the voltage and the working state of the main and negative relays, wherein the working state comprises on and off.
Preferably, the first circuit further includes a main positive relay, an anode of the main positive relay is connected to an anode of the power supply and the first end of the first resistor, and a cathode of the main positive relay is connected to an anode of the load.
Preferably, the detection circuit further includes a fourth resistor and a fifth resistor, a first end of the fourth resistor is connected to the positive electrode of the power source and the positive electrode of the load, a second end of the fourth resistor is connected to the first end of the fifth resistor, and a second end of the fifth resistor is connected to the negative electrode of the power source and the second end of the second resistor.
Preferably, the detection circuit further includes a first switching device, a second switching device, and a third switching device, and the first switching device, the second switching device, and the third switching device each include a first connection point and a second connection point;
a first connecting point of the first switching device is connected with the anode of the power supply and the anode of the load, and a second connecting point of the first switching device is connected with a first end of the first resistor, so that the first switching device is connected with the first resistor in series;
a first connecting point of the second switching device is connected with a second end of the second resistor, and a second connecting point of the second switching device is connected with a negative pole of the power supply and a negative pole of the main negative relay, so that the second switching device is connected with the second resistor in series;
and a first connecting point of the third switching device is connected with a second end of the third resistor, and a second connecting point of the third switching device is connected with the positive electrode of the main negative relay and the negative electrode of the load, so that the third switching device is connected with the third resistor in series.
Preferably, the detection circuit further comprises a fourth switching device and a fifth switching device; the fourth switching device and the fifth switching device each include a first connection point and a second connection point;
the first connection point of the fourth switching device is connected with the positive electrode of the power supply and the positive electrode of the load, the second connection point of the fourth switching device is connected with the first end of the fourth resistor, the first connection point of the fifth switching device is connected with the second end of the fifth resistor, and the second connection point of the fifth switching device is connected with the negative electrode of the power supply and the negative electrode of the main negative relay, so that the fourth switching device is connected with the fourth resistor in series and the fifth resistor is connected with the fifth switching device in series.
Preferably, the processor is connected to the first end of the third resistor for detecting the voltage of the first end of the third resistor.
Preferably, the processor is connected to the first end of the third resistor and the first end of the fifth resistor, and is configured to detect a voltage at the first end of the third resistor and a voltage at the first end of the fifth resistor, respectively.
Preferably, the system for detecting the opening and closing states of the main relay and the negative relay further comprises a first protection circuit, the first protection circuit is connected with the detection circuit, and the processor is further used for controlling and starting a protection function of the first protection circuit when the detection circuit is detected to have a fault, so as to protect the detection circuit.
Preferably, the system for detecting the open-close state of the main and negative relays further comprises a second protection circuit, the second protection circuit is connected with the load, and the processor is further configured to control and start a protection function of the second protection circuit when the detection circuit is detected to be faulty, so as to protect the load.
Preferably, the processor is further connected with the detection circuit and the second protection circuit.
The utility model has the advantages that: the utility model provides a main negative relay state detecting system that opens and shuts detects the state of opening and shutting of connecting at the main negative relay of power negative pole end through detection circuitry to ensure the normal work of main negative relay.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a system for detecting an open/close state of a main and a negative relay according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another main negative relay open/close state detection system according to the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a system for detecting an open/close state of a main and a negative relay according to a second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a system for detecting an open/close state of a main and a negative relay according to a third embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a system for detecting an open/close state of a main and a negative relay according to a fourth embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a system for detecting an open/close state of a main and negative relay according to a fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and 2, a first embodiment of the present invention provides a system 10 for detecting an open/close state of a main and a negative relay, wherein the system 10 for detecting an open/close state of a main and a negative relay includes a first circuit 100, a detection circuit 200, and a processor 300, and the first circuit 100 includes a power source 110, a load 130, and a main and a negative relay 120. The positive electrode P of the power source 110 is connected to the positive electrode z2 of the load 130, the negative electrode f2 of the load 130 is connected to the positive electrode z1 of the main negative relay 120, and the negative electrode f1 of the main negative relay 120 is connected to the negative electrode N of the power source 110.
Wherein the positive pole z2 and the negative pole f2 of the load 130 refer to one ends connected to the positive pole P and the negative pole N of the power source 110, respectively. The positive pole z1 and the negative pole f1 of the main negative relay 120 are respectively connected to one ends of the positive pole P and the negative pole N of the power source 110.
The detection circuit 200 includes a first resistor 210, a second resistor 220, and a third resistor 230, wherein the first resistor 210, the second resistor 220, and the third resistor 230 each include a first end d1 and a second end d 2. The first end d1 of the first resistor 210 is connected to the positive electrode P of the power source 110 and the positive electrode z2 of the load 130, the second end d2 of the first resistor 210 is connected to the second resistor 220 and the first end d1 of the third resistor 230, the second end d2 of the second resistor 220 is connected to the negative electrode N of the power source 110 and the negative electrode f1 of the main negative relay 120, and the second end d2 of the third resistor 230 is connected to the positive electrode z1 of the main negative relay 120 and the negative electrode f2 of the load 130.
The processor 300 is connected to the detection circuit 200, and is configured to detect a voltage in the detection circuit 200, and determine, according to a mapping relationship between the voltage and an operating state of the main negative relay 120, an operating state of the main negative relay 120 corresponding to the voltage, where the operating state includes on and off. It is to be understood that the processor 300 detecting the voltage in the detection circuit 200 includes detecting the voltage at each node in the detection circuit 200.
The resistors and devices in the system 10 may be electrically connected through wires.
The utility model provides a main negative relay state detection system 10 that opens and shuts detects the state of opening and shutting of main negative relay 120 of connecting at power 110 negative pole end through detection circuitry 200 to ensure the normal work of main negative relay 120.
The power source 110 includes, but is not limited to, one of a power battery and a storage battery, and the load 130 includes, but is not limited to, one of a vehicle-mounted charger, a vehicle control unit, a fast charging interface, a heater, or an integrated motor control.
In this embodiment, when it is determined that the working state of the main negative relay 120 corresponding to the voltage is closed, and the processor 300 detects that the main negative relay 120 has the driving signal, it is determined that the main negative relay 120 works normally; when the working state of the main negative relay 120 corresponding to the voltage is determined to be closed, and the processor 300 does not detect that the main negative relay 120 has a driving signal, it is determined that the main negative relay 120 is abnormal; when the working state of the main negative relay 120 corresponding to the voltage is determined to be off, and the processor 300 detects that the main negative relay 120 has no driving signal, it is determined that the main negative relay 120 works normally; when the working state of the main negative relay 120 corresponding to the voltage is determined to be off, and the processor 300 detects that the main negative relay 120 has a driving signal, it is determined that the main negative relay 120 is abnormal. Wherein the driving signal is a signal for driving the main negative relay 120 to close.
In a further embodiment, the processor 300 is electrically connected to the first end d1 of the third resistor 230 for detecting the voltage of the first end d1 of the third resistor 230. When the processor 300 detects that the voltage at the first end d1 of the third resistor 230 is equal to the first preset voltage, it determines that the main negative relay 120 is turned off; when the voltage of the first terminal d1 of the third resistor 230 is detected to be equal to the second preset voltage, it is determined that the main negative relay 120 is closed.
Specifically, let the resistance of the first resistor 210 be R1, the resistance of the second resistor 220 be R2, the resistance of the third resistor 230 be R3, and the voltage of the power supply 110 be U. In this embodiment, the first predetermined voltage is set to U.R 2/(R2+ R1) within a predetermined error range. When the main negative relay 120 is in an off state, the third resistor 230 is disconnected from the second resistor 220, at this time, the first resistor 210 and the second resistor 220 are connected in series with the power source 110, the voltage of the first end d1 of the second resistor 220 is U R2/(R2+ R1), and since the first end d1 of the third resistor 230 is connected with the first end d1 of the second resistor 220 only through a wire, the voltage of the first end d1 of the third resistor 230 is equal to the voltage of the first end d1 of the second resistor 220, that is, the voltage of the first end d1 of the third resistor 230 is U R2/(R2+ R1), which is a first preset voltage. Thus, it can be determined whether the main negative relay 120 is in the open state according to whether the processor 300 detects that the voltage at the first end d1 of the third resistor 230 is equal to the first preset voltage, and when the processor 300 detects that the voltage at the first end d1 of the third resistor 230 is equal to the first preset voltage, the main negative relay 120 is in the open state.
The second preset voltage is set to be U (R2// R3)/(R1+ (R2// R3)) within a certain preset error range, wherein R2// R3 represents a resistance value after the second resistor 220 and the third resistor 230 are connected in parallel, and the specific resistance value is R2R 3/(R2+ R3). When the main negative relay 120 is in a closed state, the third resistor 230 is connected in parallel with the second resistor 220, and at this time, the voltage at the first end d1 of the third resistor 230 is U (R2// R3)/(R1+ (R2// R3)), which is a second preset voltage. Thus, it can be determined whether the main negative relay 120 is in the closed state according to whether the processor 300 detects that the voltage of the first end d1 of the third resistor 230 is equal to the second preset voltage, and when the processor 300 detects that the voltage of the first end d1 of the third resistor 230 is equal to the second preset voltage, the main negative relay 120 is in the closed state.
In a further embodiment, the processor 300 is further configured to detect whether the main negative relay 120 has a driving signal. When the voltage of the first end d1 of the third resistor 230 is detected to be equal to the first preset voltage and the driving signal of the main negative relay 120 is detected, it indicates that the main negative relay 120 is abnormal and cannot be normally closed. When the voltage of the first end d1 of the third resistor 230 is detected to be equal to the second preset voltage and the main negative relay 120 is detected to have no driving signal, it indicates that the main negative relay 120 is abnormal, is in a stuck state, and cannot be normally turned off.
Referring to fig. 2 again, in a further embodiment, the system 10 for detecting the open/close state of the main and negative relays further includes a first protection circuit 400, the first protection circuit 400 is connected to the detection circuit 200, and the processor 300 is further configured to control to start the protection function of the first protection circuit 400 when detecting that the detection circuit 200 has a fault, so as to protect the detection circuit 200. The first protection circuit 400 may be a switching device disposed at both ends of the detection circuit 200. When the processor 300 detects that the detection circuit has a fault, the switching device is controlled to be turned off, so as to protect the detection circuit 200.
In a further embodiment, the system 10 for detecting the on-off state of the main and negative relays further includes a second protection circuit 500, the second protection circuit 500 is connected to the load 130 in the first loop 100, and the processor 300 is further connected to the detection circuit 200 and the second protection circuit 500; the processor 300 is further configured to control the protection function of the second protection circuit 500 to be activated to protect the load 130 when the detection circuit fails. The second protection circuit 500 may be a switching device disposed across the load 130. When the detection circuit is faulty, the processor 300 controls the switching device to be turned off, so as to start the protection function of the second protection circuit 500, and protect the load 130.
Referring to fig. 3, a second embodiment of the present invention provides a system 10a for detecting an open/close state of a main negative relay, in the system 10a, the first circuit 100 further includes a main positive relay 140, a positive pole z3 of the main positive relay 140 is connected to a positive pole P of the power source 110 and a first end d1 of the first resistor 210, and a negative pole f3 of the main positive relay 140 is connected to a positive pole z2 of the load 130. Main positive relay 140 is used to control the conduction of current at positive pole z2 of load 130. The method of determining the open/close state of the main/negative relay 120 in the second embodiment is the same as that in the first embodiment.
Referring to fig. 4, a third embodiment of the present invention provides a system 10b for detecting an opening/closing state of a main and a negative relay, which is different from the first embodiment, in the system 10b for detecting an opening/closing state of a main and a negative relay, a detection circuit 200 further includes a first switching device 201, a second switching device 202, and a third switching device 203, and the first switching device 201, the second switching device 202, and the third switching device 203 all include a first connection point L1 and a second connection point L2.
The first connection point L1 of the first switching device 201 is connected to the positive electrode P of the power source 110 and the positive electrode z2 of the load 130, and the second connection point L2 of the first switching device 201 is electrically connected to the first end d1 of the first resistor 210, so that the first switching device 201 is connected in series with the first resistor 210.
The first connection point L1 of the second switching device 202 is connected to the second end d2 of the second resistor 220, and the second connection point L2 of the second switching device 202 is connected to the negative electrode N of the power source 110 and the negative electrode f1 of the main negative relay 120, so that the second switching device 202 is connected in series with the second resistor 220.
The first connection point L1 of the third switching device 203 is connected to the second end d2 of the third resistor 230, and the second connection point L2 of the third switching device 203 is connected to the positive electrode z1 of the main negative relay 120 and the negative electrode f2 of the load 130, so that the third switching device 203 is connected in series with the third resistor 230.
In this embodiment, the first switching device 201, the second switching device 202 and the third switching device 203 in the detection circuit 200 are used to control whether the detection circuit 200 is connected to the main negative relay 120, and the three switching devices can be opened to protect the detection circuit 200 when the closed state of the main negative relay 120 does not need to be judged.
The method of determining the open/close state of the main/negative relay 120 in the third embodiment is the same as that in the first embodiment.
Referring to fig. 5, a fourth embodiment of the present invention provides a system 10c for detecting an open/close state of a main and a negative relay, which is different from the first embodiment, in the system 10c for detecting an open/close state of a main and a negative relay, a detection circuit 200 further includes a fourth resistor 240 and a fifth resistor 250, and the fourth resistor 240 and the fifth resistor 250 respectively include a first end d1 and a second end d 2; the first end d1 of the fourth resistor 240 is connected to the positive electrode P of the power source 110 and the positive electrode z2 of the load 130, the second end d2 of the fourth resistor 240 is connected to the first end d1 of the fifth resistor 250, and the second end d2 of the fifth resistor 250 is connected to the negative electrode N of the power source 110 and the second end d2 of the second resistor 220. By adding the fourth resistor 240 and the fifth resistor 250, the location of the voltage detectable by the detection circuit 200 is increased.
In a further embodiment, the processor 300 is connected to the first terminal d1 of the third resistor 230 and the first terminal d1 of the fifth resistor 250, and is used for respectively detecting the voltage of the first terminal d1 of the third resistor 230 and the voltage of the first terminal d1 of the fifth resistor 250. The processor 300 determines that the main negative relay 120 is turned off when determining that the voltage of the first end d1 of the third resistor 230 and the voltage of the first end d1 of the fifth resistor 250 satisfy the first preset relational expression; and determines that the main negative relay 120 is closed when it is determined that the voltage of the first terminal d1 of the third resistor 230 and the voltage of the first terminal d1 of the fifth resistor 250 satisfy the second preset relationship.
Specifically, let the resistance of the first resistor 210 be R1, the resistance of the second resistor 220 be R2, the resistance of the third resistor 230 be R3, the resistance of the fourth resistor 240 be R4, the resistance of the fifth resistor 250 be R5, the voltage at the first end d1 of the fifth resistor 250 be U1, and the voltage at the first end d1 of the third resistor 230 be U2. In this embodiment, the first predetermined relationship is U1 (R4+ R5)/R5 ═ U2 (R1+ R2)/R2, and when the voltage at the first end d1 of the third resistor 230 and the voltage at the first end d1 of the fifth resistor 250 satisfy the first predetermined relationship, the main-negative relay 120 is in the off state. The second preset relation is U1 (R4+ R5)/R5 ═ U2 (R1+ (R2// R3))/(R2// R3), wherein R2// R3 represents the resistance value of the second resistor 220 and the third resistor 230 after being connected in parallel, and the specific resistance value is R2 ^ R3/(R2+ R3). When the processor 300 detects that the voltage at the first end d1 of the third resistor 230 and the voltage at the first end d1 of the fifth resistor 250 satisfy the second preset relation, it indicates that the main negative relay 120 is in a closed state.
In a further embodiment, the processor 300 is further configured to detect whether the main negative relay 120 has a driving signal. When the voltage of the first end d1 of the third resistor 230 and the voltage of the first end d1 of the fifth resistor 250 are detected to satisfy the first preset relational expression and the driving signal of the main negative relay 120 is detected, it is indicated that the main negative relay 120 is abnormal and cannot be normally closed. When the voltage of the first end d1 of the third resistor 230 and the voltage of the first end d1 of the fifth resistor 250 are detected to satisfy the second preset relational expression and the main negative relay 120 is detected to have no driving signal, it is indicated that the main negative relay 120 is abnormal, is in a sticking state and cannot be normally switched off.
Referring to fig. 6, a fifth embodiment of the present invention provides a system 10d for detecting an open/close state of a main and a negative relay, in the system 10d for detecting an open/close state of a main and a negative relay, the number of resistors of a detection circuit 200 and the connection relationship between the resistors are the same as those of the fourth embodiment, and a first switch device 201, a second switch device 202 and a third switch device 203 are respectively connected in series to a first resistor 210, a second resistor 220 and a third resistor 230. In addition, the detection circuit 200 in the present embodiment further includes a fourth switching device 204 and a fifth switching device 205; the fourth switching device 204 and the fifth switching device 205 include a first connection point L1 and a second connection point L2.
The first connection point L1 of the fourth switching device 204 is connected to the positive electrode P of the power source 110 and the positive electrode z2 of the load 130, the second connection point L2 of the fourth switching device 204 is connected to the first end d1 of the fourth resistor 240, the first connection point L1 of the fifth switching device 205 is connected to the second end d2 of the fifth resistor 250, and the second connection point L2 of the fifth switching device 205 is connected to the negative electrode N of the power source 110 and the negative electrode f1 of the main negative relay 120, so that the fourth switching device 204 is connected in series with the fourth resistor 240 and the fifth resistor 250 is connected in series with the fifth switching device 205.
In the fourth embodiment, whether the detection circuit 200 having the first resistor 210, the second resistor 220, the third resistor 230, the fourth resistor 240 and the fifth resistor 250 is connected to the main negative relay 120 is controlled by the first switching device 201, the second switching device 202, the third switching device 203, the fourth switching device 204 and the fifth switching device 205, and the five switching devices can be opened to protect the detection circuit 200 when it is not necessary to judge the closed state of the main negative relay 120.
The method of determining the open/close state of the main negative relay 120 in the fifth embodiment is the same as that in the fourth embodiment.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The system for detecting the opening and closing state of the main and negative relays is characterized by comprising a first loop, a detection circuit and a processor, wherein the first loop comprises a power supply, a load and the main and negative relays, the positive pole of the power supply is connected with the positive pole of the load, the negative pole of the load is connected with the positive pole of the main and negative relays, and the negative pole of the main and negative relays is connected with the negative pole of the power supply;
the detection circuit comprises a first resistor, a second resistor and a third resistor, wherein a first end of the first resistor is connected with a positive electrode of the power supply and a positive electrode of the load, a second end of the first resistor is connected with a first end of the second resistor and a first end of the third resistor, a second end of the second resistor is connected with a negative electrode of the power supply and a negative electrode of the main negative relay, and a second end of the third resistor is connected with a positive electrode of the main negative relay and a negative electrode of the load;
the processor is connected with the detection circuit and used for detecting the voltage in the detection circuit and determining the working state of the main and negative relays corresponding to the voltage according to the mapping relation between the voltage and the working state of the main and negative relays, wherein the working state comprises on and off.
2. The main negative relay on-off state detection system of claim 1, wherein the first circuit further comprises a main positive relay, a positive pole of the main positive relay is connected to a positive pole of the power source and the first end of the first resistor, and a negative pole of the main positive relay is connected to a positive pole of the load.
3. The system of claim 1, wherein the detection circuit further comprises a fourth resistor and a fifth resistor, a first end of the fourth resistor is connected to the positive terminal of the power source and the positive terminal of the load, a second end of the fourth resistor is connected to a first end of the fifth resistor, and a second end of the fifth resistor is connected to the negative terminal of the power source and a second end of the second resistor.
4. The main negative relay on-off state detection system of claim 1, wherein the detection circuit further comprises a first switching device, a second switching device, and a third switching device, the first switching device, the second switching device, and the third switching device each comprising a first connection point and a second connection point;
a first connecting point of the first switching device is connected with the anode of the power supply and the anode of the load, and a second connecting point of the first switching device is connected with a first end of the first resistor, so that the first switching device is connected with the first resistor in series;
a first connecting point of the second switching device is connected with a second end of the second resistor, and a second connecting point of the second switching device is connected with a negative pole of the power supply and a negative pole of the main negative relay, so that the second switching device is connected with the second resistor in series;
and a first connecting point of the third switching device is connected with a second end of the third resistor, and a second connecting point of the third switching device is connected with the positive electrode of the main negative relay and the negative electrode of the load, so that the third switching device is connected with the third resistor in series.
5. The main negative relay on-off state detection system of claim 3, wherein the detection circuit further comprises a fourth switching device and a fifth switching device; the fourth switching device and the fifth switching device each include a first connection point and a second connection point;
the first connection point of the fourth switching device is connected with the positive electrode of the power supply and the positive electrode of the load, the second connection point of the fourth switching device is connected with the first end of the fourth resistor, the first connection point of the fifth switching device is connected with the second end of the fifth resistor, and the second connection point of the fifth switching device is connected with the negative electrode of the power supply and the negative electrode of the main negative relay, so that the fourth switching device is connected with the fourth resistor in series and the fifth resistor is connected with the fifth switching device in series.
6. The system for detecting the open-close state of a main relay and a negative relay as claimed in claim 1, wherein the processor is connected with the first end of the third resistor for detecting the voltage of the first end of the third resistor.
7. The system for detecting the open-close state of the main relay and the negative relay as claimed in claim 3, wherein the processor is connected to the first end of the third resistor and the first end of the fifth resistor for respectively detecting the voltage of the first end of the third resistor and the voltage of the first end of the fifth resistor.
8. The system according to any one of claims 1-7, wherein the system further comprises a first protection circuit connected to the detection circuit, and the processor is further configured to control a protection function of the first protection circuit to protect the detection circuit when the detection circuit is detected to be faulty.
9. The system according to any one of claims 1-7, wherein the system further comprises a second protection circuit, the second protection circuit is connected to the load, and the processor is further configured to control activation of a protection function of the second protection circuit to protect the load when the detection circuit is detected to be faulty.
10. The main negative relay on-off state detection system of claim 9, wherein the processor is further coupled to the detection circuit and the second protection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022366376.8U CN213482399U (en) | 2020-10-21 | 2020-10-21 | Main and negative relay on-off state detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022366376.8U CN213482399U (en) | 2020-10-21 | 2020-10-21 | Main and negative relay on-off state detection system |
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| CN213482399U true CN213482399U (en) | 2021-06-18 |
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| CN202022366376.8U Active CN213482399U (en) | 2020-10-21 | 2020-10-21 | Main and negative relay on-off state detection system |
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