CN214409237U - Short circuit detection circuit - Google Patents
Short circuit detection circuit Download PDFInfo
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- CN214409237U CN214409237U CN202022713367.1U CN202022713367U CN214409237U CN 214409237 U CN214409237 U CN 214409237U CN 202022713367 U CN202022713367 U CN 202022713367U CN 214409237 U CN214409237 U CN 214409237U
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Abstract
The utility model provides a short circuit detection circuitry, include: the device comprises a first relay, a second relay, a voltage division module, a sampling module and a control module, wherein one end of the first relay is connected with a live wire of a target power supply; one end of the second relay is connected with a zero line of the target power supply; the first end of the voltage division module is connected with the other end of the first relay, and the second end of the voltage division module is connected with the other end of the second relay and used for dividing the voltage of the target power supply; the first end of the sampling module is connected with the third end of the voltage division module, and the second end of the sampling module is grounded and used for sampling the divided target power supply to obtain a first voltage; the control module is used for controlling the first relay to be closed and controlling the second relay to be opened so as to judge whether the target power supply is short-circuited or not according to the first voltage. Therefore, whether the target power supply has the short-circuit fault or not can be accurately judged in real time, and the situation that the main relay is burnt out due to the short-circuit fault can be effectively avoided.
Description
Technical Field
The utility model relates to a short circuit detection technical field, concretely relates to short circuit detection circuit.
Background
In the related art, in the field of ac charging or dc charging, it is impossible to accurately determine whether a short-circuit fault occurs at the output terminal of the charging power supply in real time, and therefore, when a short-circuit fault occurs at the output terminal of the charging power supply, once the main relay is closed, the main relay will be burned, and even a fire will be caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned technical problem, provide a short circuit detection circuitry, connect short circuit detection circuitry through the output at the target power supply, can accurately judge whether the target power supply takes place the short-circuit fault in real time to can avoid effectively leading to the condition that main relay burns out because of taking place the short-circuit fault.
The utility model adopts the technical scheme as follows:
a short detection circuit comprising: the device comprises a first relay, a second relay, a voltage division module, a sampling module and a control module, wherein one end of the first relay is connected with a live wire of a target power supply; one end of the second relay is connected with a zero line of the target power supply; the first end of the voltage division module is connected with the other end of the first relay, and the second end of the voltage division module is connected with the other end of the second relay and used for dividing the voltage of the target power supply; the first end of the sampling module is connected with the third end of the voltage division module, and the second end of the sampling module is grounded and used for sampling the divided target power supply to obtain a first voltage; the control module is used for controlling the first relay to be closed and controlling the second relay to be opened so as to judge whether the target power supply is short-circuited or not according to the first voltage.
The sampling module comprises: and one end of the sampling resistor is connected with the third end of the voltage division module, and the other end of the sampling resistor is grounded.
The voltage division module includes: one end of the first capacitor is connected with the other end of the first relay, and the other end of the first capacitor is connected with one end of the sampling resistor; and one end of the second capacitor is connected with the other end of the second relay, and the other end of the second capacitor is connected with one end of the sampling resistor.
The voltage division module further comprises: and one end of the divider resistor is connected with the other end of the first capacitor and the other end of the second capacitor respectively, and the other end of the divider resistor is connected with one end of the sampling resistor.
The utility model has the advantages that:
the utility model discloses a connect short circuit detection circuitry at target power supply's output, can accurately judge whether short circuit fault takes place for target power supply in real time to can avoid effectively leading to the condition that main relay burns out because of taking place short circuit fault.
Drawings
Fig. 1 is a schematic structural diagram of a short circuit detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a short circuit detection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a short circuit detection circuit according to another 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.
Fig. 1 is a schematic structural diagram of a short circuit detection circuit according to an embodiment of the present invention.
At present, in the field of ac charging or dc charging, once the output terminal of the charging power supply has a short-circuit fault, when the main relay is closed to control the charging power supply to charge the load, the main relay will be burned out, or even a fire will be caused, so it is important to detect the short-circuit fault of the output terminal of the charging power supply before the main relay is closed.
In the related technology, whether the output end of the charging power supply has a short-circuit fault or not can not be accurately judged in real time, and the reliability and the safety of a charging system are greatly reduced.
Therefore, the utility model provides a short circuit detection circuitry connects short circuit detection circuitry through the output at the target power supply, can accurately judge whether the short circuit trouble takes place for the target power supply in real time to can avoid effectively leading to the condition that main relay burns out because of taking place the short circuit trouble.
Specifically, as shown in fig. 1, the short circuit detection circuit according to an embodiment of the present invention may include: a first relay 100, a second relay 200, a voltage divider module 300, a sampling module 400, and a control module 500.
Wherein, one end of the first relay 100 is connected with a live wire L of the target power supply; one end of the second relay 200 is connected with a zero line N of the target power supply; a first end of the voltage dividing module 300 is connected to the other end of the first relay 100, and a second end of the voltage dividing module 300 is connected to the other end of the second relay 200, so as to divide the voltage of the target power supply; the first end of the sampling module 400 is connected to the third end of the voltage dividing module 300, and the second end of the sampling module 400 is grounded, so as to sample the divided target power supply to obtain a first voltage; the control module 500 is configured to control the first relay 100 to close and control the second relay 200 to open, so as to determine whether the target power source is shorted according to the first voltage.
According to an embodiment of the present invention, as shown in fig. 2, the sampling module 400 may include a sampling resistor Rc, wherein one end of the sampling resistor Rc is connected to the third end of the voltage divider module 300, and the other end of the sampling resistor Rc is grounded.
According to an embodiment of the present invention, as shown in fig. 2, the voltage dividing module 300 may include: a first capacitor C1 and a second capacitor C2, wherein one end of the first capacitor C1 is connected to the other end of the first relay 100, and the other end of the first capacitor C1 is connected to one end of the sampling resistor Rc; one end of the second capacitor C2 is connected to the other end of the second relay 200, and the other end of the second capacitor C2 is connected to one end of the sampling resistor Rc.
Specifically, as shown in fig. 2, when the target power supply charges the load, if the target power supply is not short-circuited, when the first relay 100 is controlled to be closed and the second relay 200 is controlled to be opened, the live line L, the first capacitor C1 and the sampling resistor Rc of the target power supply may form a loop, and at this time, the voltage across the sampling resistor R1 may be U1; if the target power source is short-circuited, when the first relay 100 is controlled to be closed and the second relay 200 is controlled to be opened, the live line L of the target power source, the first capacitor C1, the second capacitor C2 and the sampling resistor Rc may form a loop, and at this time, the voltage across the sampling resistor Rc may be U2. It is understood that when the target power source is in both the short circuit and open circuit states, the corresponding voltage U1 and voltage U2 are not the same. The first capacitor C1 and the second capacitor C2 can divide the voltage of the target power supply, and can also achieve the purpose of isolation in the circuit, so as to protect the circuit and further improve the safety.
Therefore, at the time of factory setting, in the case that the target power supply is not short-circuited, the control module 500 may first control the first relay 100 to be closed and control the second relay 200 to be opened, and acquire the voltage across the sampling resistor Rc, that is, a second voltage, and store the second voltage in the storage unit.
In the actual operation process, the control module 500 may control the first relay 100 to be closed again and control the second relay 200 to be opened, at this time, the control module 500 may obtain the voltage at the two ends of the sampling resistor Rc again, that is, the first voltage, and compare the first voltage with the second voltage to determine whether the target power source is short-circuited.
Specifically, when the target power source is an alternating current (e.g., an output power source of the charging pile), the first voltage and the second voltage may be alternating current voltages, and at this time, it may be determined whether corresponding amplitudes of the first voltage and the second voltage at the same phase are the same, if so, it may be determined that the target power source is not short-circuited, and if not, it may be determined that the target power source is short-circuited; when the target power supply is direct current, the first voltage and the second voltage are direct current voltages, at this time, whether the first voltage and the second voltage are the same or not can be judged, if yes, the target power supply can be judged not to be short-circuited, and if not, the target power supply can be judged to be short-circuited.
Of course, in practical applications, the current of the sampling resistor Rc may be detected to determine whether the target power source has a short-circuit fault, and specific determination methods can be seen in the above-mentioned method for determining whether the target power source has a short-circuit fault by detecting the voltage across the sampling resistor Rc, and will not be described in detail herein.
Therefore, the short-circuit detection circuit is connected to the output end of the target power supply, so that whether the target power supply has a short-circuit fault can be accurately judged in real time, and the situation that the main relays (the first relay 100 and the second relay 200) are burnt out due to the short-circuit fault can be effectively avoided.
Based on the above embodiments, in practical applications, the voltage dividing module 300 may be formed by other components besides the voltage dividing module 300 formed by the first capacitor C1 and the second capacitor C2.
According to an embodiment of the present invention, as shown in fig. 3, the voltage dividing module 300 may further include a voltage dividing resistor R1. One end of the voltage dividing resistor R1 is connected to the other end of the first capacitor C1 and the other end of the second capacitor C2, respectively, and the other end of the voltage dividing resistor R1 is connected to one end of the sampling resistor Rc.
Specifically, in practical applications, there may be a case where the voltage across the sampling resistor R1 is large, and if the sampling is directly performed through the sampling resistor R1, the sampling resistor R1 may be burned, so as to perform voltage division through the voltage division module 300 formed by the first capacitor C1 and the second capacitor C2, as another possible implementation, in addition to performing voltage division through the voltage division module 300, a voltage division resistor R1 may be added to perform voltage division, so as to further improve the safety.
Of course, as another possible implementation, the first capacitor C1 and the second capacitor C2 may be replaced by a plurality of resistors connected in series to implement voltage division, so as to improve the safety of the circuit.
It is understood that, as shown in fig. 2 and 3, when the second relay 200 is controlled to be closed, the voltage across the sampling resistor R1 is 0 regardless of whether the target power supply is short-circuited, and therefore, when the live line L and the neutral line N of the target power supply cannot be determined, the first relay 100 may be controlled to be closed and the second relay 200 may be controlled to be opened, or the first relay 100 may be controlled to be opened and the second relay may be controlled to be closed, so as to determine the live line L and the neutral line N of the target power supply according to the voltage across the sampling resistor R1.
To sum up, according to the utility model discloses a short-circuit detection circuit, the one end of first relay links to each other with the live wire of target power supply, the one end of second relay links to each other with target power supply's zero line, the first end of voltage division module links to each other with the other end of first relay, the second end of voltage division module links to each other with the other end of second relay, be used for carrying out the partial pressure to target power supply, the first end of sampling module links to each other with the third end of voltage division module, the second end ground connection of sampling module, be used for sampling in order to acquire first voltage to target power supply after the partial pressure, and through the closed of the first relay of control module control, and control second relay disconnection, in order to judge whether the short circuit takes place for target power supply according to first voltage. Therefore, the output end of the target power supply is connected with the short-circuit detection circuit, whether the target power supply has the short-circuit fault or not can be accurately judged in real time, and the situation that the main relay is burnt out due to the short-circuit fault can be effectively avoided.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present invention includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (4)
1. A short detection circuit, comprising: the device comprises a first relay, a second relay, a voltage division module, a sampling module and a control module, wherein,
one end of the first relay is connected with a live wire of a target power supply;
one end of the second relay is connected with a zero line of the target power supply;
the first end of the voltage division module is connected with the other end of the first relay, and the second end of the voltage division module is connected with the other end of the second relay so as to divide the voltage of the target power supply;
the first end of the sampling module is connected with the third end of the voltage division module, and the second end of the sampling module is grounded and used for sampling the divided target power supply to obtain a first voltage;
the control module is used for controlling the first relay to be closed and controlling the second relay to be opened so as to judge whether the target power supply is short-circuited or not according to the first voltage.
2. The short detection circuit of claim 1, wherein the sampling module comprises:
and one end of the sampling resistor is connected with the third end of the voltage division module, and the other end of the sampling resistor is grounded.
3. The short circuit detection circuit of claim 2, wherein the voltage divider module comprises:
one end of the first capacitor is connected with the other end of the first relay, and the other end of the first capacitor is connected with one end of the sampling resistor;
and one end of the second capacitor is connected with the other end of the second relay, and the other end of the second capacitor is connected with one end of the sampling resistor.
4. The short circuit detection circuit of claim 3, wherein the voltage divider module further comprises:
and one end of the divider resistor is connected with the other end of the first capacitor and the other end of the second capacitor respectively, and the other end of the divider resistor is connected with one end of the sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022713367.1U CN214409237U (en) | 2020-11-19 | 2020-11-19 | Short circuit detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022713367.1U CN214409237U (en) | 2020-11-19 | 2020-11-19 | Short circuit detection circuit |
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| Publication Number | Publication Date |
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| CN214409237U true CN214409237U (en) | 2021-10-15 |
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| CN202022713367.1U Active CN214409237U (en) | 2020-11-19 | 2020-11-19 | Short circuit detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917366A (en) * | 2021-12-13 | 2022-01-11 | 宁波均胜新能源汽车技术有限公司 | Interphase short circuit detection circuit and detection method for three-phase charging pile wall box |
| CN116819391A (en) * | 2023-06-30 | 2023-09-29 | 科大智能（合肥）科技有限公司 | Output short-circuit fault detection circuit of charging pile |
-
2020
- 2020-11-19 CN CN202022713367.1U patent/CN214409237U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917366A (en) * | 2021-12-13 | 2022-01-11 | 宁波均胜新能源汽车技术有限公司 | Interphase short circuit detection circuit and detection method for three-phase charging pile wall box |
| CN116819391A (en) * | 2023-06-30 | 2023-09-29 | 科大智能（合肥）科技有限公司 | Output short-circuit fault detection circuit of charging pile |
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