CN112147537A - Circuit and method for detecting open circuit and short circuit of load - Google Patents
Circuit and method for detecting open circuit and short circuit of load Download PDFInfo
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- CN112147537A CN112147537A CN202010986539.4A CN202010986539A CN112147537A CN 112147537 A CN112147537 A CN 112147537A CN 202010986539 A CN202010986539 A CN 202010986539A CN 112147537 A CN112147537 A CN 112147537A
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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Abstract
The invention provides a circuit for detecting the open circuit and the short circuit of a load, which comprises a first photoelectric coupler and a second photoelectric coupler, wherein the input side of the first photoelectric coupler can receive a driving pulse, and the collector of a triode at the output side can be coupled to the positive pole of a power supply; the anode end of the diode at the input side of the second photoelectric coupler is coupled with the emitter of the triode of the first photoelectric coupler, the cathode end of the diode is coupled with the load, and the output side of the second photoelectric coupler outputs an electric signal which can be used for judging whether the load is in short circuit or not. By the embodiment of the invention, the load break and short circuit detection function can be stably and reliably realized so as to realize fire alarm detection.
Description
Technical Field
The invention relates to the technical field of fire alarm, in particular to a circuit for detecting the open and short circuit of a load and a load open and short circuit detection method.
Background
In the field of fire alarm, it is necessary to perform short-circuit detection on a load on a terminal so as to prevent and monitor a circuit from a fire. At present, a circuit which is realized by the load break and short circuit detection function in the industry generally has larger leakage current, low-power-consumption equipment such as broadcasting modules is easy to be started by mistake, and weak continuous signals can cause the false start, so that the normal use of electrical equipment is influenced.
The statements in this background section merely represent techniques known to the public and are not, of course, representative of the prior art.
Disclosure of Invention
In view of at least one of the drawbacks of the prior art, the present invention provides a circuit for detecting open/short circuit of a load, the circuit including a first photo coupler and a second photo coupler,
the input side of the first photoelectric coupler can receive driving pulses, and the collector of the triode at the output side can be coupled to the positive electrode of a power supply;
the anode end of the diode at the input side of the second photoelectric coupler is coupled with the emitter of the triode of the first photoelectric coupler, the cathode end of the diode is coupled with the load, and the output side of the second photoelectric coupler outputs an electric signal which can be used for judging whether the load is in short circuit or not.
According to an aspect of the present invention, the circuit further includes a rectifying unit connected between the power supply positive electrode, the collector of the transistor of the first photo coupler, the cathode terminal of the diode of the second photo coupler, and the load, and configured to allow current to flow only in the direction of the power supply positive electrode, the first photo coupler, the second photo coupler, and the load.
According to an aspect of the present invention, the circuit further includes a current limiting unit connected between the positive electrode of the power supply and the rectifying unit.
According to an aspect of the invention, the circuit further comprises a detection resistor, the detection resistor is connected in parallel with the load, one end of the detection resistor is connected with the rectifying unit, and the other end of the detection resistor is connected with the negative electrode of the power supply.
According to an aspect of the present invention, the circuit further includes a control unit coupled to an input side of the first photo coupler and capable of providing the driving pulse, and coupled to an output side of the second photo coupler and receiving the electrical signal capable of determining that the load is open and short-circuited.
According to an aspect of the invention, the control unit is configured to determine whether the load is open or short according to the electrical signal.
According to an aspect of the present invention, an anode terminal of a diode of an input side of the first photocoupler is coupled to the control unit and receives the driving pulse, and a cathode terminal is grounded through a resistor; and the collector of the triode at the output end of the second photoelectric coupler is coupled to a voltage source, and the emitter of the triode is coupled to the control unit and outputs the electric signal which can be used for judging the short circuit and the break of the load.
According to one aspect of the invention, the control unit is configured to: when the electric signal is detected to be at a high level, judging that the load is normal; and when the electric signal is at a low level, judging that the load is disconnected and short-circuited.
According to one aspect of the invention, the detection pulse has a pulse width of 500 microseconds and a duty cycle of 0.017% -0.033%.
The invention also relates to a load open-short circuit detection method, which uses the circuit as any one of the above to detect, and comprises the following steps:
s101: providing a circuit as claimed in any one of the above;
s102: connecting the collector of the triode of the first photoelectric coupler of the circuit to the positive pole of a power supply;
s103: connecting a cathode terminal of a diode of a second photocoupler of the circuit to a load;
s104: connecting a negative pole of the power source to the load;
s105: providing a driving pulse to an input side of the first photocoupler;
s106: acquiring an electric signal output by the output side of the second photoelectric coupler; and
s107: and judging the short circuit state of the load according to the collected electric signal.
According to an aspect of the invention, further comprising:
providing a relay connected between the power source positive, the circuit and the load;
controlling the relay so that the power source positive electrode is connected to the circuit, and performing the steps S105, S106, and S107;
controlling the relay so that the power source positive electrode is connected to the load.
The embodiment of the invention provides the circuit and the detection method for detecting the open circuit and the short circuit of the load, overcomes the defect that the traditional circuit for realizing the function of detecting the open circuit and the short circuit of the load is easy to cause the false start of equipment due to the existence of larger leakage current, and improves the safety, the stability and the reliability of the circuit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a functional block diagram of a circuit according to one embodiment of the invention;
FIG. 2 shows a circuit diagram according to an embodiment of the invention;
FIG. 3 shows a flow diagram of a load break short detection method according to one embodiment of the invention; and
fig. 4 shows a schematic diagram of a relay in connection with an electrical circuit according to an embodiment of the invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.
Fig. 1 shows a functional block diagram of a circuit according to an embodiment of the present invention, and fig. 2 shows a circuit diagram according to an embodiment of the present invention. As shown in fig. 1, a circuit 100 for detecting an open short of a load 40 includes a first photocoupler 10 and a second photocoupler 20. As shown in fig. 2, wherein the input side of the first photocoupler 10 (the terminal 1 of the first photocoupler 10, i.e., the anode terminal of the diode of the first photocoupler 10) may receive the driving pulse DR (OUT _ C terminal input in fig. 2), the collector of the triode on the output side (the terminal 4 of the first photocoupler 10) may be coupled to the positive electrode HV of the power supply 30. An anode terminal of a diode (terminal 1 of the second photocoupler 20) on the input side of the second photocoupler 20 is coupled to an emitter of a transistor (terminal 3 of the first photocoupler 10) of the first photocoupler 10, a cathode terminal of the diode (terminal 2 of the second photocoupler 20) is coupled to the load 40, and an output side of the second photocoupler 20 outputs an electrical signal (output from DEV _ C in fig. 2) for determining that the load 40 is short-circuited. Wherein the power source 30 and the load 40 are external circuit elements.
According to a preferred embodiment of the present invention, as shown in fig. 1 and 2, the circuit 100 further includes a rectifying unit 50. The rectifying unit 50 is connected between the positive electrode HV of the power source 10, the collector of the transistor of the first photocoupler 10, the cathode terminal of the diode of the second photocoupler 20, and the load 40, and is configured to allow current to flow only in the direction of the positive electrode HV of the power source, the first photocoupler 10, the second photocoupler 20, and the load 40. Specifically, as shown in fig. 2, the rectifying unit 50 is composed of four diodes in a bridge structure, the input terminal 50-1 of the rectifying unit 50 is connected to the positive electrode HV of the power supply 30, the input terminals 50-1 and 50-2 of the rectifying unit 50 are connected to the collector of the triode of the first photocoupler 10 through two diodes of the rectifying unit 50, the cathode terminal of the diode of the second photocoupler 20 is connected to the input terminal 50-1 and 50-2 of the rectifying unit 50 through two diodes of the rectifying unit 50, and the input terminal 50-2 of the rectifying unit 50 is connected to the negative electrode of the power supply 10 through the load 40.
According to an embodiment of the present invention, as shown in fig. 1 and 2, the circuit 100 further includes a current limiting unit 60, and the current limiting unit 60 is connected between the positive electrode of the power supply and the rectifying unit 50. Specifically, as shown in fig. 2, a port Pin _ NC1 is provided upstream of the current limiting unit 60, a port Pin _ NC2 is provided downstream of the input terminal 50-2 of the rectifying unit 50, the port Pin _ NC1 is connected to the positive electrode HV of the power supply 30, and the port Pin _ NC2 is connected to the load 40. The current limiting unit 60 is connected between the positive pole of the power supply 10 and the input terminal 50-1 of the rectifying unit 50, and includes two current limiting resistors connected in series, i.e., R17 and R40.
According to an embodiment of the present invention, the circuit 100 further includes a detection resistor (not shown in the figure), which is connected in parallel with the load 40, and has one end connected to the rectifying unit 50 and the other end connected to the negative pole of the power supply 30.
According to an embodiment of the invention, the circuit further comprises a control unit 70, as shown in fig. 1. As shown in fig. 2, the control unit 70 is coupled to the input side of the first photocoupler 10 (e.g., the port 1 of the first photocoupler 10 shown in the figure) through the OUT _ C terminal and can provide the driving pulse DR, and the control unit 70 is coupled to the output side of the second photocoupler 20 and receives the electrical signal output by the DEV _ C terminal and can be used for determining load break and short circuit. According to one embodiment of the invention, the control unit 70 is an MCU.
According to an embodiment of the present invention, as shown in fig. 2, the anode terminal of the diode at the input side of the first photocoupler 10 is coupled to the control unit 70 and receives the driving pulse DR, and the cathode terminal is grounded through a resistor R37; the collector of the triode at the output terminal of the second photocoupler 20 is coupled to a voltage source, and the emitter is coupled to the control unit 70 and outputs the electrical signal for determining the load break and short circuit.
According to an embodiment of the present invention, the control unit 70 is configured to determine whether the load 40 is short or open according to the electrical signal. The detection mechanism of the circuit 100 is that the control unit 70 generates a high-speed pulse signal DR to drive a photo-isolating switch type element (e.g., a first photo-coupler) to turn on the circuit. When the connected load is normal and has no open-circuit fault, the circuit forms a closed loop, and at the moment, the control unit can acquire a standard logic level through a photoelectric isolation switch type element (such as a second photoelectric coupler) and monitor the load and the line state; when the line of the accessed load 40 shows open circuit, the circuit can not form a closed loop, at the moment, the control unit can acquire different levels through a photoelectric isolation switch type element (such as a second photoelectric coupler), when the power supply line and the load line show short circuit, the internal detection lost electric signal shows the same logic level with the output open circuit, so that the short circuit of the output load unit end is judged, the fault state is reported, and the fire alarm detection function is realized.
Specifically, referring to fig. 2, when the detection function of the circuit 100 is applied, the control unit 70 outputs a high level at the OUT _ C terminal, the first photocoupler 10 is turned on, and the second photocoupler 20 is simultaneously turned on, so that a power supply loop including the power supply positive electrode HV, the rectifying circuit 50, the first photocoupler 10, the second photocoupler 20, and the load 40 is turned on to form a current. Since the second photocoupler 20 is turned on, the transistor of the second photocoupler 20 is also turned on, and at this time, the control unit 70 determines that the power supply circuit is normally turned on and determines that the load 40 is normal if the electrical signal collected at the DEV _ C terminal is at a high level. When the load 40 is short-circuited or broken, even if the control unit 70 sends the driving pulse DR, the power supply circuit cannot be conducted due to the short-circuit and break of the load 40, so that the diode of the second photocoupler 20 cannot be conducted, and the transistor of the second photocoupler 20 cannot be conducted, so that the control unit 70 determines that the power supply circuit is abnormally conducted and determines that the load 40 is short-circuited when the electric signal collected by the DEV _ C terminal is low. And resetting the OUT _ C terminal to be low level after the detection is finished. The circuit 100 can realize pulse mode detection, a power supply loop has no continuous leakage current, fixed pulse detection can effectively avoid false start of an external load, and the start of the external load can be performed after multiple detections and confirmations. Optionally, the pulse width of the detection pulse is 500 microseconds, and the duty ratio is 0.017% -0.033%. Those skilled in the art will appreciate that the pulse width and duty cycle of the detection pulse may be adjusted according to actual circuit requirements, and these are all within the scope of the present invention.
The invention also relates to a load break and short circuit detection method, such as the load break and short circuit detection method shown in fig. 3 according to one embodiment of the invention. The load open-short circuit detection method 300 uses the circuit 100 to perform open-short circuit detection on a load, and as shown in fig. 2, the load open-short circuit detection method 300 includes:
in step S101: the circuit 100 is provided.
In step S102: the collector of the transistor of the first optocoupler 10 of the circuit 100 is connected to the positive terminal of the power supply 30.
In step S103: the cathode terminal of the diode of the second photocoupler 20 of the circuit 100 is connected to the load 40.
In step S104: the negative pole of the power source 10 is connected to the load 40. At this time, the first photocoupler 10, the second photocoupler 20, the power source 30, and the load 40 form a loop of the circuit 100.
In step S105: a drive pulse is supplied to the input side of the first photocoupler 10. An anode terminal of the diode of the input side of the first photocoupler 10 is coupled to the control unit 70 and receives the driving pulse.
In step S106: and collecting an electric signal output from the output side of the second photocoupler 20. The emitter of the triode at the output terminal of the second photocoupler 20 is coupled to the control unit 70, and the control unit 70 collects the output electrical signal.
In step S107: and judging the short-circuit state of the load 40 according to the collected electric signal. When the collected electric signal is at a high level, the circuit 100 where the load is located is in a normal state, and the load 40 is judged to be normal; when the collected electrical signal is at a low level, it indicates that the circuit 100 in which the load is located is in an open-short circuit state, and it is determined that the load 40 is open-short circuited. Thereby realizing the fire alarm detection function.
Fig. 4 shows a schematic diagram of a relay in connection with an electrical circuit according to an embodiment of the invention. As shown, the load break and short circuit detection method 300 further includes:
providing a relay connected between the power source positive, the circuit and the load. The relay includes two sets of single pole double throw switches and an overcurrent protection unit, wherein the positive electrode HV of the power supply 30 is selectively connectable to and switchable between one of a port Pin _ NC1 (normally closed) or a port Pin _ NO1 (normally open) in one set of single pole double throw switches, and correspondingly, the positive electrode HV of the load 40 is selectively connectable to and switchable between one of a port Pin _ NC2 (normally closed) or a port Pin _ NO2 (normally open) in the other set of single pole double throw switches. So that the positive pole HV of the power supply 30 can be connected to the positive pole of the circuit 100 or the load 40, respectively, by controlling the relay. When the relay is connected to the load 40, an overcurrent protection unit in the relay plays a role of overcurrent protection for the circuit.
The relay is controlled so that the power source positive electrode is connected to the circuit, and the steps S105, S106, and S107 are performed. Specifically, as can be seen from fig. 2, the relays are controlled to connect the positive terminal HV of the power supply 30 to the port Pin _ NC1 and the positive terminal of the load 40 to the port Pin _ NC2, and thus to the circuit 100.
Controlling the relay so that the power source positive electrode is connected to the load. As shown in fig. 2, the relay is controlled to connect the positive electrode HV of the power supply 30 to the port Pin _ NO1 and the positive electrode HV of the load 40 to the port Pin _ NO2, so that the overcurrent protection unit is in circuit, so that when the current in the circuit exceeds a predetermined maximum threshold, the overcurrent protection unit operates to overcurrent protect the circuit.
The embodiment of the invention provides a detection circuit in a fire alarm system, and overcomes the defect that the false start of external equipment is easily caused by large leakage current of a load break and short circuit detection function circuit in the prior art. The detection circuit of the embodiment of the invention has simple principle, realizes the isolation of the load and the core control unit through the photoelectric element, thereby improving the safety and the reliability of the circuit, almost has no leakage current, has the leakage energy approaching 0 in the positive period, can not cause the false operation of external equipment, has safe and stable performance, and reliably realizes the load short circuit detection function and the fire alarm detection.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A circuit for detecting open and short circuit of a load comprises a first photoelectric coupler and a second photoelectric coupler,
the input side of the first photoelectric coupler can receive driving pulses, and the collector of the triode at the output side can be coupled to the positive electrode of a power supply;
the anode end of the diode at the input side of the second photoelectric coupler is coupled with the emitter of the triode of the first photoelectric coupler, the cathode end of the diode is coupled with the load, and the output side of the second photoelectric coupler outputs an electric signal which can be used for judging whether the load is in short circuit or not.
2. The circuit of claim 1, further comprising a rectifying unit connected between the power supply positive electrode, the collector of the transistor of the first photocoupler, the cathode terminal of the diode of the second photocoupler, and the load, configured to allow current to flow only in the direction of the power supply positive electrode, the first photocoupler, the second photocoupler, and the load.
3. The circuit of claim 2, further comprising a current limiting unit connected between the power supply positive electrode and the rectifying unit.
4. The circuit of any of claims 1-3, further comprising a sense resistor connected in parallel with the load, one end connected to the rectifying unit, and the other end connected to the negative pole of the power source.
5. The circuit of any of claims 1-3, further comprising a control unit coupled to an input side of the first photo coupler and operable to provide the drive pulse, and coupled to an output side of the second photo coupler and operable to receive the electrical signal operable to determine that the load is open and short circuited.
6. The circuit of claim 5, wherein the control unit is configured to determine whether the load is open or short based on the electrical signal.
7. The circuit of claim 6, wherein an anode terminal of the diode at the input side of the first photocoupler is coupled to the control unit and receives the driving pulse, and a cathode terminal is grounded through a resistor; and the collector of the triode at the output end of the second photoelectric coupler is coupled to a voltage source, and the emitter of the triode is coupled to the control unit and outputs the electric signal which can be used for judging the short circuit and the break of the load.
8. The circuit of claim 7, the control unit configured to: when the electric signal is detected to be at a high level, judging that the load is normal; and when the electric signal is at a low level, judging that the load is disconnected and short-circuited.
9. The circuit of claims 1-3, wherein the detection pulse has a pulse width of 500 microseconds and a duty cycle of 0.017% -0.033%.
10. A load open and short circuit detection method using the circuit of any one of claims 1-9 for detection, the load open and short circuit detection method comprising:
s101: providing a circuit according to any one of claims 1-6;
s102: connecting the collector of the triode of the first photoelectric coupler of the circuit to the positive pole of a power supply;
s103: connecting a cathode terminal of a diode of a second photocoupler of the circuit to a load;
s104: connecting a negative pole of the power source to the load;
s105: providing a driving pulse to an input side of the first photocoupler;
s106: acquiring an electric signal output by the output side of the second photoelectric coupler; and
s107: and judging the short circuit state of the load according to the collected electric signal.
11. The detection method of claim 10, further comprising:
providing a relay connected between the power source positive, the circuit and the load;
controlling the relay so that the power source positive electrode is connected to the circuit, and performing the steps S105, S106, and S107;
controlling the relay so that the power source positive electrode is connected to the load.
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| CN202010986539.4A CN112147537A (en) | 2020-09-18 | 2020-09-18 | Circuit and method for detecting open circuit and short circuit of load |
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| CN202010986539.4A CN112147537A (en) | 2020-09-18 | 2020-09-18 | Circuit and method for detecting open circuit and short circuit of load |
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| CN203688642U (en) * | 2013-11-14 | 2014-07-02 | 青岛世泽电子仪表有限公司 | Power failure detection circuit |
| CN206505162U (en) * | 2017-02-24 | 2017-09-19 | 中山市禾元电器有限公司 | A kind of failure detector circuit of relay |
| CN107727992A (en) * | 2017-11-06 | 2018-02-23 | 李娟� | A kind of load circuit and its wire break detection method |
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| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN210129024U (en) * | 2019-03-20 | 2020-03-06 | 日立汽车***(苏州）有限公司 | Load diagnosis device |
| CN110514932A (en) * | 2019-08-30 | 2019-11-29 | 广州市帝能云科技有限公司 | A kind of load detection circuit for access |
| CN110884380A (en) * | 2019-11-12 | 2020-03-17 | 东风汽车有限公司 | Alternating-current charging stake ground connection detects and controlling means and alternating-current charging stake |
| CN211348584U (en) * | 2019-11-19 | 2020-08-25 | 广东惠晟检验科技有限公司 | Leakage current tester |
| CN111474501A (en) * | 2020-05-29 | 2020-07-31 | 上海挚达科技发展有限公司 | Fill ground signal detection circuitry of electric pile |
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