CN208207183U - High-voltage interlocking detection circuit and electric car - Google Patents
High-voltage interlocking detection circuit and electric car Download PDFInfo
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- CN208207183U CN208207183U CN201820816325.0U CN201820816325U CN208207183U CN 208207183 U CN208207183 U CN 208207183U CN 201820816325 U CN201820816325 U CN 201820816325U CN 208207183 U CN208207183 U CN 208207183U
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Abstract
The utility model proposes a kind of high-voltage interlocking detection circuit and electric cars, are related to fault detection technique field.The high-voltage interlocking detection circuit includes main control chip, high-voltage interlocking interface, bleeder circuit, first resistor and power supply, main control chip includes the first detection port and the second detection port, bleeder circuit is electrically connected with the first detection port and power supply, high-voltage interlocking interface and first resistor are parallel between power supply and the second detection port, and the detection voltage of detection voltage and the second detection port that main control chip detects port according to first judges whether high-voltage interlocking interface occurs open circuit.Main control chip according to the detection voltage of the first detection port and the detection voltage of the second detection port determines whether that high-voltage interlocking failure occurs, avoid that there are erroneous detection occurs when problem in high-voltage interlocking detection circuit itself, to improve the reliability of high-voltage interlocking fault detection, and then improve the security level of vehicle.
Description
Technical field
The utility model relates to fault detection technique fields, in particular to a kind of high-voltage interlocking detection circuit and electricity
Electrical automobile.
Background technique
Currently, electric car has had become one of the important development direction of new-energy automobile development.In existing electricity
Among the electric framework of electrical automobile, one of critical function of battery management system is exactly to detect high-voltage interlocking state, such as Fig. 1
It is shown, be currently used high-voltage interlocking detection circuit, in the circuit, the reference power supply of 5V, vehicle high-voltage interlocking interface and
The detection port of main control module (MCU) is sequentially connected electrically to form measure loop, and the detection port of MCU and a pull down resistor electricity
Connection, MCU judge whether high-voltage interlocking interface disconnects according to the voltage signal of detection port, that is, it is mutual to judge whether there is high pressure
Lock failure.For example, the level that the voltage signal for then detecting port is 5V is believed when the connection of vehicle high-voltage interlocking interface is normal
Number；When vehicle high-voltage interlocking interface is off-state, then the voltage signal for detecting port is the level letter for pulling down to 0V
Number.
However in practical applications, it when measure loop itself breaks down, is shorted for example, the somewhere of measure loop exists
When the case where power supply or short circuit ground, if just can not judge whether really there is high-voltage interlocking according only to the voltage signal of detection port
Failure, i.e., can not judge whether high-voltage interlocking interface really disconnects, so that the operation to vehicle has some impact on.
Utility model content
The purpose of this utility model is to provide a kind of high-voltage interlocking detection circuit and electric cars, to improve high-voltage interlocking
The reliability of fault detection promotes the security level of vehicle.
To achieve the goals above, the utility model embodiment the technical solution adopted is as follows:
In a first aspect, the utility model proposes a kind of high-voltage interlocking detection circuit, the high-voltage interlocking detection circuit includes
Main control chip, high-voltage interlocking interface, bleeder circuit, first resistor and power supply, the main control chip include the first test side
Mouth and the second detection port, the bleeder circuit are electrically connected with the first detection port and the power supply, the height
Mutual lock interface and the first resistor is pressed to be parallel between the power supply and second detection port；The main control chip
Detection voltage for detection voltage and second detection port according to first detection port judges that the high pressure is mutual
Whether lock interface occurs open circuit.
Further, the main control chip is used in the detection voltage of first detection port be the first preset value and institute
When the detection voltage for stating the second detection port is the second preset value, determine that open circuit occurs for the high-voltage interlocking interface.
Further, the bleeder circuit includes second resistance and 3rd resistor, and the second resistance and the third are electric
Resistance is series between the power supply and ground, and first detection port is electrically connected to the second resistance and third electricity
Between resistance.
Further, the high-voltage interlocking detection circuit further includes diode, the anode of the diode and described second
Resistance, the power supply are electrically connected, and the cathode of the diode and the high-voltage interlocking interface, the first resistor are electric
Connection.
Further, the power supply includes current source and the 4th resistance, one end and the electricity of the 4th resistance
The electrical connection of stream source, the other end of the 4th resistance are electrically connected with the anode of the diode.
Further, the high-voltage interlocking detection circuit further includes amplifying circuit, one end of the amplifying circuit with it is described
High-voltage interlocking interface, the first resistor are electrically connected, and the other end of the amplifying circuit is electrically connected with second detection port
It connects.
Further, the amplifying circuit includes operational amplifier and the 5th resistance, one end of the 5th resistance and institute
The non-inverting input terminal for stating high-voltage interlocking interface, the first resistor and the operational amplifier is electrically connected, the 5th resistance
The other end and the inverting input terminal of the operational amplifier be grounded, the output end of the operational amplifier and second inspection
Survey port electrical connection.
Further, the high-voltage interlocking detection circuit further includes the 6th resistance, and one end of the 5th resistance passes through institute
The 6th resistance is stated to be electrically connected with the high-voltage interlocking interface and the first resistor.
Second aspect, the utility model also propose that a kind of electric car, the electric car include high-voltage interlocking detection electricity
Road, the high-voltage interlocking detection circuit include main control chip, high-voltage interlocking interface, bleeder circuit, first resistor and power supply,
The main control chip includes the first detection port and the second detection port, and the bleeder circuit and described first detects port and institute
It states power supply to be electrically connected, the high-voltage interlocking interface and the first resistor are parallel to the power supply and described second
It detects between port；The main control chip is used for detection voltage and second detection port according to first detection port
Detection voltage judge whether the high-voltage interlocking interface occurs open circuit.
Further, the electric car further includes entire car controller, the entire car controller and main control chip electricity
Connection, for executing troubleshooting movement when the main control chip judges that open circuit occurs for the high-voltage interlocking interface.
Compared with the prior art, the utility model embodiment has the advantages that
High-voltage interlocking detection circuit provided by the embodiment of the utility model and electric car, the high-voltage interlocking detection circuit
Including main control chip, high-voltage interlocking interface, bleeder circuit, first resistor and power supply, the main control chip includes the first inspection
Port and the second detection port are surveyed, the bleeder circuit is electrically connected with the first detection port and the power supply, institute
It states high-voltage interlocking interface and the first resistor is parallel between the power supply and second detection port；The master control
Chip is used to judge the height according to the detection voltage of first detection port and the detection voltage of second detection port
Press whether mutual lock interface occurs open circuit.In this application, due to high-voltage interlocking interface and first resistor be parallel to power supply and
Second detection port between, in high-voltage interlocking detection circuit there are high-voltage interlocking failure, there is no high-voltage interlocking failure, occur
Be shorted power supply or be shorted when earth fault, main control chip will obtain different first detection ports detection voltage and
The detection voltage of the second different detection ports, and according to the detection of the detection voltage of the first detection port and the second detection port
Voltage determines whether that high-voltage interlocking failure occurs, to improve the reliability of high-voltage interlocking fault detection, and then improves whole
The security level of vehicle.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 shows a kind of structural block diagram of high-voltage interlocking detection circuit provided by the utility model embodiment.
Fig. 2 shows another structural block diagrams of high-voltage interlocking detection circuit provided by the utility model embodiment.
Fig. 3 shows the physical circuit connection signal of high-voltage interlocking detection circuit 100 provided by the embodiment of the utility model
Figure.
Fig. 4 show high-voltage interlocking detection circuit provided by the utility model embodiment normal connection and without high pressure it is mutual
Lock current trend schematic diagram when failure.
Fig. 5 shows high-voltage interlocking detection circuit provided by the utility model embodiment and is normally connecting and having high pressure mutual
Lock current trend schematic diagram when failure.
Fig. 6 shows the structural block diagram of electric car provided by the utility model embodiment.
Icon: 10- electric car；100- high-voltage interlocking detection circuit；200- entire car controller；110- main control chip；
120- high-voltage interlocking interface；130- bleeder circuit；140- power supply；150- amplifying circuit；141- current source.
Specific embodiment
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations
Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below
The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model
Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile it is practical new at this
In the description of type, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relatively important
Property.
Fig. 1 is please referred to, is the structural block diagram of high-voltage interlocking detection circuit 100 provided by the utility model embodiment.It should
High-voltage interlocking detection circuit 100 can be applied to electric car, for before electric automobile high-voltage powers on and electric car is in height
During pressure is run after powering on, the connection status of the high-tension line of electric car is monitored, electric car is avoided high pressure occur
Security risk improves the safety of vehicle.
As shown in Figure 1, the high-voltage interlocking detection circuit 100 includes main control chip 110, high-voltage interlocking interface 120, partial pressure
Circuit 130, first resistor R1 and power supply 140, the main control chip 110 include the first detection port AD1 and the second detection
Port AD2, the bleeder circuit 130 are electrically connected with the first detection port AD1 and the power supply 140, the height
Mutual lock interface 120 and the first resistor R1 is pressed to be parallel between the power supply 140 and the second detection port AD2.
The main control chip 110 is used for detection voltage and second test side according to the first detection port AD1
The detection voltage of mouth AD2 judges whether the high-voltage interlocking interface 120 occurs open circuit.
In the present embodiment, the main control chip 110 is used in the detection voltage of the first detection port AD1 be first
When the detection voltage of preset value and the second detection port AD2 are the second preset value, determine that the high-voltage interlocking interface 120 is sent out
Raw open circuit.
In the present embodiment, due to one first resistor R1 of the both ends parallel connection of high-voltage interlocking interface 120, work as high-voltage interlocking
When open circuit occurs for interface 120, power supply 140 can form access, power supply by first resistor R1, the second detection port AD2
Power supply 140, which detects port AD1 by bleeder circuit 130, first, can also form access, at this time main control chip 110 collected the
The detection voltage of one detection port AD1 is the first above-mentioned preset value, the detection voltage of collected second detection port AD2
The second as above-mentioned preset value；And high-voltage interlocking detection circuit 100 is in high-voltage interlocking interface 120 and the feelings except open circuit occurs
Condition, such as high-voltage interlocking detection circuit 100 do not have somewhere in any failure or circuit to occur to be shorted power supply or be shorted ground
Failure, then in the detection voltage of the detection voltage of the first detection port AD1 and the second detection port AD2 at least it is for a moment
It changes, in this way, just can accurately judge that open circuit occurs for the high-voltage interlocking interface 120 in high-voltage interlocking detection circuit 100, i.e.,
Whether energy accurate judgement circuit occurs high-voltage interlocking failure.
Further, as shown in Fig. 2, in the present embodiment, the high-voltage interlocking detection circuit 100 further includes amplifying circuit
150, one end of the amplifying circuit 150 is electrically connected with the high-voltage interlocking interface 120, the first resistor R1, described to put
The other end of big circuit 150 is electrically connected with the second detection port AD2.It is appreciated that the detection electricity of the second detection port AD2
Pressure is to amplify obtained voltage signal by the amplifying circuit 150, in this way, facilitating main control chip 110 to the second detection port
The detection voltage of AD2 is acquired, and avoids the too weak generation for leading to error of voltage signal in circuit.
As shown in figure 3, the physical circuit connection for high-voltage interlocking detection circuit 100 provided by the embodiment of the utility model is shown
It is intended to.In the present embodiment, the bleeder circuit 130 include second resistance R2 and 3rd resistor R3, the second resistance R2 with
The 3rd resistor R3 is series between the power supply 140 and ground, and the first detection port AD1 is electrically connected to described the
Between two resistance R2 and the 3rd resistor R3.
The high-voltage interlocking detection circuit 100 further includes diode D1, the anode of the diode D1 and second electricity
Resistance R2, the power supply 140 are electrically connected, the cathode of the diode D1 and the high-voltage interlocking interface 120, described first
Resistance R2 is electrically connected.
The power supply 140 includes current source 141 and the 4th resistance R4, one end and the electricity of the 4th resistance R4
Stream source 141 is electrically connected, and the other end of the 4th resistance R4 is electrically connected with the anode of the diode D1.
In the present embodiment, the 12V power supply power supply that the current source 141 can be provided by vehicle.
The amplifying circuit 150 includes operational amplifier U1 and the 5th resistance R5, and the high-voltage interlocking detection circuit 100 is also
Including the 6th resistance R6, one end of the 5th resistance R5 and the high-voltage interlocking interface 120, the first resistor R1 and described
The non-inverting input terminal of operational amplifier U1 is electrically connected, and the other end of the 5th resistance R5 and the operational amplifier U1's is anti-
Phase input terminal is grounded, and the output end of the operational amplifier U1 is electrically connected with the second detection port AD2.Wherein, described
One end of 5th resistance R5 is electrically connected by the 6th resistance R6 with the high-voltage interlocking interface 120 and the first resistor R1
It connects.
In the present embodiment, operational amplifier U1 can be powered by the 12V power supply that vehicle provides.
It, not only can be by detecting high pressure in the high-voltage interlocking detection circuit 100 provided by the utility model embodiment
The connection of mutual lock interface 120 is monitored the working condition of high voltage interlock circuit itself, it can judges electric car
In high voltage interlock circuit whether have high-voltage interlocking failure occur, and the high-voltage interlocking detection circuit 100 itself may be implemented
Diagnostic function, that is, judge high-voltage interlocking detection circuit 100 itself whether have generation be shorted power supply or be shorted earth fault.
For example, in high-voltage interlocking detection circuit 100 itself, normally connection and high-voltage interlocking interface 120 are in normal connection
In the case where, the current trend of high-voltage interlocking detection circuit 100 is as shown in figure 4, the first detection that main control chip 110 obtains at this time
The detection voltage of port AD1 is V1, and the detection voltage of the second detection port AD2 of acquisition is V2；In high-voltage interlocking detection circuit
In the case that open circuit occurs for 100 normal connection itself and high-voltage interlocking interface 120, the electric current of high-voltage interlocking detection circuit 100 is walked
To as shown in figure 5, the detection voltage for the first detection port AD1 that main control chip 110 obtains at this time is V1, the second detection of acquisition
The detection voltage of port AD2 is V3 (V3 < V2)；In this way, detection voltage and the second detection port in the first detection port AD1
When the detection voltage of AD2 does not meet any one of the above situation (i.e. V1 and V2, V1 and V3), high-voltage interlocking detection electricity can be determined
Failure (for example, be shorted power supply or be shorted ground) itself has occurred in road 100, that is, realizes high-voltage interlocking detection circuit 100 itself
Diagnostic function avoids high-voltage interlocking detection circuit 100 and erroneous detection occurs during carrying out high-voltage interlocking fault detection.
As shown in fig. 6, for the structural block diagram of electric car 10 provided by the utility model embodiment.The electric car 10
Including above-mentioned high-voltage interlocking detection circuit 100 and entire car controller 200, the entire car controller 200 and the main control chip
110 electrical connections, for executing troubleshooting when the main control chip 110 judges that open circuit occurs for the high-voltage interlocking interface 120
Movement.
In the present embodiment, entire car controller 200 can generate CPSR signal by control relay, and pass through the CPRS
Signal controls vehicle and executes troubleshooting movement, for example, can be performed electronic under high pressure when determining generation high-voltage interlocking failure
Make, to promote the security level of vehicle.
In conclusion high-voltage interlocking detection circuit provided by the embodiment of the utility model and electric car, the high pressure are mutual
Locking detection circuit includes main control chip, high-voltage interlocking interface, bleeder circuit, first resistor and power supply, the main control chip
Including the first detection port and the second detection port, the bleeder circuit and the first detection port and the power supply are equal
Electrical connection, the high-voltage interlocking interface and the first resistor be parallel to the power supply and second detection port it
Between；The main control chip is used for the detection voltage according to first detection port and the detection voltage of second detection port
Judge whether the high-voltage interlocking interface occurs open circuit.In this application, it is parallel to due to high-voltage interlocking interface with first resistor
Power supply and second detection port between, in high-voltage interlocking detection circuit there are high-voltage interlocking failure, there is no high pressure it is mutual
Failure is locked, occurs to be shorted power supply or be shorted when earth fault, main control chip will obtain the first different detection ports
The detection voltage of voltage and the second different detection ports is detected, and according to the detection voltage of the first detection port and the second inspection
The detection voltage for surveying port determines whether that high-voltage interlocking failure occurs, so that the reliability of high-voltage interlocking fault detection is improved,
And then improve the security level of vehicle.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.It should be noted that
To: similar label and letter indicate similar terms in following attached drawing, therefore, once determined in a certain Xiang Yi attached drawing
Justice does not need then that it is further defined and explained in subsequent attached drawing.
Claims (10)
1. a kind of high-voltage interlocking detection circuit, which is characterized in that the high-voltage interlocking detection circuit includes that main control chip, high pressure are mutual
Lock interface, bleeder circuit, first resistor and power supply, the main control chip include the first detection port and the second test side
Mouthful, the bleeder circuit is electrically connected with the first detection port and the power supply, the high-voltage interlocking interface and institute
First resistor is stated to be parallel between the power supply and second detection port；
The main control chip is used for the detection voltage according to first detection port and the detection electricity of second detection port
Pressure judges whether the high-voltage interlocking interface occurs open circuit.
2. high-voltage interlocking detection circuit as described in claim 1, which is characterized in that the main control chip is used for described first
When the detection voltage of detection port is the first preset value and the described second detection voltage for detecting port is the second preset value, determine
Open circuit occurs for the high-voltage interlocking interface.
3. high-voltage interlocking detection circuit as described in claim 1, which is characterized in that the bleeder circuit include second resistance and
3rd resistor, the second resistance and the 3rd resistor are series between the power supply and ground, first test side
Mouth is electrically connected between the second resistance and the 3rd resistor.
4. high-voltage interlocking detection circuit as claimed in claim 3, which is characterized in that the high-voltage interlocking detection circuit further includes
Diode, the anode of the diode are electrically connected with the second resistance, the power supply, the cathode of the diode with
The high-voltage interlocking interface, the first resistor are electrically connected.
5. high-voltage interlocking detection circuit as claimed in claim 4, which is characterized in that the power supply includes current source and
One end of four resistance, the 4th resistance is electrically connected with the current source, the other end and the diode of the 4th resistance
Anode electrical connection.
6. high-voltage interlocking detection circuit as described in claim 1, which is characterized in that the high-voltage interlocking detection circuit further includes
Amplifying circuit, one end of the amplifying circuit are electrically connected with the high-voltage interlocking interface, the first resistor, the amplification electricity
The other end on road is electrically connected with second detection port.
7. high-voltage interlocking detection circuit as claimed in claim 6, which is characterized in that the amplifying circuit includes operational amplifier
And the 5th resistance, one end of the 5th resistance and the high-voltage interlocking interface, the first resistor and the operational amplifier
Non-inverting input terminal be electrically connected, the other end of the 5th resistance and the inverting input terminal of the operational amplifier are grounded,
The output end of the operational amplifier is electrically connected with second detection port.
8. high-voltage interlocking detection circuit as claimed in claim 7, which is characterized in that the high-voltage interlocking detection circuit further includes
One end of 6th resistance, the 5th resistance passes through the 6th resistance and the high-voltage interlocking interface and first resistor electricity
Connection.
9. a kind of electric car, which is characterized in that including the described in any item high-voltage interlocking detection circuits of claim 1-8.
10. electric car as claimed in claim 9, which is characterized in that the electric car further includes entire car controller, described
Entire car controller is electrically connected with the main control chip, for judging that open circuit occurs for the high-voltage interlocking interface in the main control chip
Shi Zhihang troubleshooting movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820816325.0U CN208207183U (en) | 2018-05-29 | 2018-05-29 | High-voltage interlocking detection circuit and electric car |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820816325.0U CN208207183U (en) | 2018-05-29 | 2018-05-29 | High-voltage interlocking detection circuit and electric car |
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| Publication Number | Publication Date |
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| CN208207183U true CN208207183U (en) | 2018-12-07 |
Family
ID=64515874
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| CN201820816325.0U Active CN208207183U (en) | 2018-05-29 | 2018-05-29 | High-voltage interlocking detection circuit and electric car |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655708A (en) * | 2019-01-04 | 2019-04-19 | 北京新能源汽车股份有限公司 | Electric automobile and fault detection device and method of high-voltage interlocking system of electric automobile |
| CN109782160A (en) * | 2019-02-25 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| CN110058180A (en) * | 2019-04-04 | 2019-07-26 | 上海捷新动力电池系统有限公司 | A kind of power battery pack system high pressure interlocking connector detection system |
| CN111532132A (en) * | 2019-01-21 | 2020-08-14 | 北京新能源汽车股份有限公司 | High-voltage interlocking detection device, processing method and automobile |
| CN111796213A (en) * | 2020-07-10 | 2020-10-20 | 的卢技术有限公司 | Detection circuit and method for electrical loop integrity and breakpoint positioning |
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2018
- 2018-05-29 CN CN201820816325.0U patent/CN208207183U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655708A (en) * | 2019-01-04 | 2019-04-19 | 北京新能源汽车股份有限公司 | Electric automobile and fault detection device and method of high-voltage interlocking system of electric automobile |
| CN109655708B (en) * | 2019-01-04 | 2021-04-09 | 北京新能源汽车股份有限公司 | Electric automobile and fault detection device and method of high-voltage interlocking system of electric automobile |
| CN111532132A (en) * | 2019-01-21 | 2020-08-14 | 北京新能源汽车股份有限公司 | High-voltage interlocking detection device, processing method and automobile |
| CN109782160A (en) * | 2019-02-25 | 2019-05-21 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| US11320481B2 (en) | 2019-02-25 | 2022-05-03 | Contemporary Amperex Tectaology Co., Limited | High voltage interlock circuit and detection method |
| CN110058180A (en) * | 2019-04-04 | 2019-07-26 | 上海捷新动力电池系统有限公司 | A kind of power battery pack system high pressure interlocking connector detection system |
| CN111796213A (en) * | 2020-07-10 | 2020-10-20 | 的卢技术有限公司 | Detection circuit and method for electrical loop integrity and breakpoint positioning |
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