CN211209273U - Overcurrent detection protection circuit - Google Patents
Overcurrent detection protection circuit Download PDFInfo
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- CN211209273U CN211209273U CN201922151166.4U CN201922151166U CN211209273U CN 211209273 U CN211209273 U CN 211209273U CN 201922151166 U CN201922151166 U CN 201922151166U CN 211209273 U CN211209273 U CN 211209273U
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Abstract
The utility model discloses an overcurrent detection protection circuit, it is provided with overcurrent protection host system, the overcurrent protection return circuit, current detection isolating circuit and feedback circuit, through being provided with first sense terminal and second sense terminal access circuit detection current information that awaits measuring in the overcurrent protection return circuit, and send current information to feedback circuit after converting into voltage information through the current detection isolating circuit, feedback circuit transmits this voltage information to overcurrent protection host system, overcurrent protection host system is according to the operating condition in the voltage information control overcurrent protection return circuit of receiving, the technical problem that short-circuit protection circuit can not realize two-way overcurrent protection among the prior art has been solved, a reliable, can realize two-way detection's overcurrent protection circuit is provided.
Description
Technical Field
The utility model belongs to the technical field of the circuit safety technique and specifically relates to a detection and protection circuit overflows.
Background
With the wide application of electrical equipment, a short-circuit protection circuit is often required to be equipped in the use scene of each electrical equipment, so as to prevent further greater danger caused by the short-circuit of the circuit.
The subway train non-contact logic control unit uses electronic devices such as a novel optical coupler and a field effect tube to realize non-contact control of a switch, and when the logic control unit replaces the logic function of a traditional electromagnetic relay, the short circuit protection function of a switch circuit is realized by an MOS tube, so that the problems of relay burning loss, poor relay contact and the like caused by short circuit protection of mechanical contacts of the electromagnetic relay are solved.
However, the existing contactless logic control unit of the subway train has only one-way characteristic of short-circuit protection of output dry contact points, and cannot adapt to scene change for bidirectional detection. Therefore, how to improve the existing short-circuit protection circuit to enhance the short-circuit protection detection function thereof becomes a technical problem which needs to be overcome by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a reliable, have the overcurrent detection protection circuit of two-way detection function.
In a first aspect, an embodiment of the present invention provides an overcurrent detection protection circuit, which includes: the overcurrent protection device comprises an overcurrent protection main control module, an overcurrent protection loop, a current detection isolation circuit and a feedback circuit;
the overcurrent protection circuit is connected with the output end of the overcurrent protection main control module and receives a control signal of the overcurrent protection main control module, and is provided with a first detection end and a second detection end which are respectively connected into a circuit to be detected and used for detecting current information of the circuit to be detected;
the current detection isolation circuit is connected with the output end of the overcurrent protection main control module and used for receiving an output signal of the protection main control module; the current detection isolation circuit is connected with the overcurrent protection loop and used for receiving the current information; the current detection isolation circuit is connected with the feedback circuit and used for converting the current information into voltage information and transmitting the voltage information to the feedback circuit;
the feedback circuit is connected with the feedback input end of the overcurrent protection main control module and used for feeding the voltage information back to the overcurrent protection main control module, and the overcurrent protection main control module controls the working state of the overcurrent protection loop according to the voltage information.
The utility model discloses overcurrent detection protection circuit has following beneficial effect at least:
the embodiment of the utility model provides an overcurrent detection protection circuit, it is provided with overcurrent protection host system, the overcurrent protection return circuit, current detection isolating circuit and feedback circuit, through be provided with first sense terminal and second sense terminal access circuit detection current information that awaits measuring in the overcurrent protection return circuit, and send current information to feedback circuit after converting into voltage information through the current detection isolating circuit, feedback circuit transmits this voltage information to overcurrent protection host system, overcurrent protection host system is according to the operating condition in the voltage information control overcurrent protection return circuit of receiving, the technical problem that short-circuit protection circuit can not realize two-way overcurrent protection among the prior art has been solved, a reliable, can realize two-way detection's overcurrent protection circuit is provided.
According to other embodiments of the present invention, the current detection isolation circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first end of the first resistor is respectively connected with the first end of the second resistor and the output end of the overcurrent protection main control module, the second end of the first resistor is respectively connected with the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected with the first detection end, the cathode of the second diode is connected with the first end of the third resistor, the second end of the third resistor is respectively connected with the first end of the fourth resistor, the first end of the feedback circuit and the feedback input end of the overcurrent protection main control module, the second end of the fourth resistor is connected with the negative electrode of the third diode, the positive electrode of the third diode is respectively connected with the positive electrode of the fourth diode and the second end of the second resistor, and the negative electrode of the fourth diode is connected with the second detection end.
According to other embodiments of the present invention, the overcurrent protection circuit includes a first MOS transistor and a second MOS transistor; the drain electrode of the first MOS tube is the first detection end, the drain electrode of the second MOS tube is the second detection end, the drain electrode of the first MOS tube is connected with the cathode of the first diode, the source electrode of the first MOS tube is respectively connected with the source electrode of the second MOS tube and the low potential end of the power supply, the grid electrode of the first MOS tube is respectively connected with the grid electrode of the second MOS tube, the output end of the overcurrent protection main control module and the first end of the first resistor, and the drain electrode of the second MOS tube is connected with the cathode of the fourth diode.
According to the utility model discloses an overcurrent detection protection circuit of other embodiments, feedback circuit includes fifth resistance and first electric capacity, the first end of fifth resistance respectively with overcurrent protection host system's feedback input end the first end of first electric capacity the second end of third resistance is connected, the second end of fifth resistance respectively with the second end of first electric capacity the power low potential end is connected.
According to the utility model discloses an overcurrent detection protection circuit of other embodiments, overcurrent detection protection circuit still includes the on-off control circuit, the on-off control circuit with overcurrent protection host system's input is connected, thereby the on-off control circuit is used for receiving on-off control signal control overcurrent protection host system's operating condition.
According to other embodiments of the present invention, the overcurrent detection protection circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, and a first optocoupler; the first end of the sixth resistor is a control signal input end, the second end of the sixth resistor is respectively connected with the first end of the seventh resistor and the first input end of the first optocoupler, the second end of the seventh resistor is respectively connected with the second input end of the first optocoupler and a power ground, the first output end of the first optocoupler is respectively connected with the power input end of the overcurrent protection main control module and an external power supply, the second output end of the first optocoupler is respectively connected with the logic input end of the overcurrent protection main control module and the first end of the eighth resistor, and the second end of the eighth resistor is respectively connected with the logic grounding end of the overcurrent protection main control module and the low potential end of the power supply.
According to the utility model discloses an overcurrent detection protection circuit of other embodiments, overcurrent protection host system includes IR21271 model chip.
Drawings
Fig. 1 is a block diagram of an embodiment of an over-current detection protection circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of an over-current detection protection circuit according to the present invention;
fig. 3 is a simplified circuit diagram of a specific embodiment of the over-current protection circuit including the over-current protection circuit, the current detection isolation circuit and the feedback circuit.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
In the description of the embodiments of the present invention, if reference is made to "first", "second", "third", etc., it should be understood as being used to distinguish between technical features, and not as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
Referring to fig. 1, in the embodiment of the present invention, the over-current detection protection circuit includes an over-current protection main control module, an over-current protection circuit, a current detection isolation circuit and a feedback circuit; the output end of the overcurrent protection main control module is connected with the control end of the overcurrent protection circuit and used for controlling the on/off of the overcurrent protection circuit, a first detection end and a second detection end are arranged in the overcurrent circuit and are both connected into the circuit to be detected and used for detecting the current information of the circuit to be detected. Meanwhile, a current detection isolation circuit is arranged and respectively connected with an overcurrent protection main control module, an overcurrent protection loop and a feedback circuit, and is used for receiving current information detected in the overcurrent protection circuit, realizing the isolation that the current direction in the overcurrent protection loop flows from a first detection end to a second detection end and flows out, or flows from the second detection end to two direction detection loops flowing out from the first detection end, simultaneously converting the obtained current information into voltage information and transmitting the voltage information to the feedback circuit, the feedback circuit is connected with a feedback input end of the overcurrent protection main control module, feeding the obtained voltage information back to the overcurrent protection main control module, the overcurrent protection main control module outputs a control signal to the on or off of the overcurrent protection loop according to the magnitude of the received voltage information, when the current direction of the circuit to be detected flows in from the first detection end or flows in from the second detection end to be overlarge, the overcurrent protection main control module outputs a control signal to control the overcurrent protection circuit to be closed, so that electronic components in the overcurrent protection circuit are prevented from being burnt out due to overlarge current in the circuit to be tested.
Referring to fig. 2, in some embodiments, the overcurrent protection master control module U2 is an IR21271 model chip; the current detection isolation circuit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; the overcurrent protection loop comprises a first MOS transistor Q1 and a second MOS transistor Q2; the feedback circuit comprises a fifth resistor R5 and a first capacitor C1; in this embodiment, the drain of the first MOS transistor Q1 is the first detection terminal OUT-a, the drain of the second MOS transistor Q2 is the second detection terminal OUT-B, the first terminal of the fifth resistor R5 is the first terminal of the feedback circuit, and the second terminal of the fifth resistor R5 is the second terminal of the feedback circuit. A first end of the first resistor R1 is connected to a first end of the second resistor R2, an output end HO of the overcurrent protection main control module U2, a gate of the first MOS transistor Q1, and a gate of the second MOS transistor Q2, a second end of the first resistor R1 is connected to an anode of the first diode D1 and an anode of the second diode D2, a cathode of the first diode D1 is connected to a drain of the first MOS transistor Q1 (i.e., the first detection end OUT-a), a cathode of the second diode D2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, a first end of the first capacitor C1, a first end of the fifth resistor R5 (i.e., a first end of the feedback circuit), a feedback input end CS of the overcurrent protection main control module U2, a second end of the fourth resistor R4 is connected to a cathode of the third diode D3, and an anode of the fourth diode 4D 3, A second end of the second resistor R2 is connected, a cathode of the fourth diode D4 is connected to a drain (i.e., a second detection end) of the second MOS transistor Q2, and a second end of the fifth resistor R5 (i.e., a second end of the feedback circuit) is connected to the second end of the first capacitor C1, the source of the first MOS transistor Q1, the source of the second MOS transistor Q2, and the low potential power supply terminal VSS, respectively.
In some embodiments, the over-current detection protection circuit further includes a switch control circuit, the switch control circuit is connected to the input terminal of the over-current protection main control module, and the switch control circuit is configured to receive a switch control signal so as to control the operating state of the over-current protection main control module.
Specifically, referring to fig. 2, in the present embodiment, the switch control circuit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a first optical coupler U1; the first end of the sixth resistor R6 is a control signal input end, the control signal input end is connected to an external control device for receiving an external control signal, and in the actual use process, the sixth resistor R6 can be connected to a signal output end of the CPU for receiving the control of the CPU. The second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the first input end of the first optocoupler U1, the second end of the seventh resistor R7 is connected to the second input end of the first optocoupler U1 and the power ground GND, the first output end of the first optocoupler U1 is connected to the power input VCC and the external power VCC of the overcurrent protection main control module U2, the second output end of the first optocoupler U1 is connected to the logic input end IN of the overcurrent protection main control module U2 and the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the logic ground terminal COM and the power low potential terminal VSS of the overcurrent protection main control module U2. Through setting up the switch control circuit who has first opto-coupler U1, can strengthen the interference killing feature of overcurrent detection protection circuit, prevent that external disturbance signal from disturbing overcurrent protection main control module U2's normal work to influence overcurrent detection protection circuit's performance.
The following detailed description the utility model relates to an overcurrent protection circuit's working process principle:
referring to fig. 3, fig. 3 is a circuit simplified diagram of a specific embodiment including an overcurrent protection circuit, a current detection isolation circuit and a feedback circuit in the overcurrent detection protection circuit, during normal operation, the output HO of the overcurrent protection main control module U2 outputs a high level, at this time, the first MOS transistor Q1 and the second MOS transistor Q2 are both in a conducting state, when the first detection end OUT-a is connected to the positive electrode of the power supply of the circuit to be detected, the second detection end OUT-B is connected to the load of the circuit to be detected, at this time, the current flows to the circuit: OUT-A → the first MOS tube Q1 → the second MOS tube Q2 → OUT-B, when the short circuit occurs in the circuit to be tested and the current increases, the first diode D1 clamps, the voltage of the positive pole of the first diode D1 gradually increases, the divided voltage of the fifth resistor R5 in the feedback circuit also gradually increases, when the divided voltage of the fifth resistor R5 reaches the protection threshold value of the input feedback end CS of the overcurrent protection main control module U2, the output end HO of the overcurrent protection main control module U2 is turned off, at the moment, the first MOS tube Q1 and the second MOS tube Q2 are turned off, and therefore the first MOS tube Q1 and the second MOS tube Q2 are effectively protected from being burned OUT. Correspondingly, when the second detection end OUT-B is connected to the power supply anode of the circuit to be detected and the first detection end OUT-A is connected to the load of the circuit to be detected, the current flow direction is as follows: OUT-B → the second MOS transistor Q2 → the first MOS transistor Q1 → OUT-a, which realizes the overcurrent detection protection in accordance with the above correspondence. And the embodiment of the utility model provides an in, realize the isolation of two current detection directions through being provided with second diode D2 and third diode D3, provide a reliable, overcurrent detection protection circuit who has the bidirectional detection function.
To sum up, the utility model discloses in an overcurrent detection protection circuit, it is provided with overcurrent protection host system, the overcurrent protection return circuit, current detection isolating circuit and feedback circuit, through be provided with first sense terminal and second sense terminal access circuit detection current information that awaits measuring in the overcurrent protection return circuit, and send current information to feedback circuit after converting into voltage information through current detection isolating circuit, feedback circuit transmits this voltage information to overcurrent protection host system, overcurrent protection host system is according to the operating condition of the voltage information control overcurrent protection return circuit that receives, the technical problem that short-circuit protection circuit can not realize two-way overcurrent protection among the prior art has been solved, a reliable overcurrent protection circuit that can realize two-way detection is provided.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (7)
1. An over-current detection protection circuit, comprising: the overcurrent protection device comprises an overcurrent protection main control module, an overcurrent protection loop, a current detection isolation circuit and a feedback circuit;
the overcurrent protection circuit is connected with the output end of the overcurrent protection main control module and receives a control signal of the overcurrent protection main control module, and is provided with a first detection end and a second detection end which are respectively connected into a circuit to be detected and used for detecting current information of the circuit to be detected;
the current detection isolation circuit is connected with the output end of the overcurrent protection main control module and used for receiving an output signal of the protection main control module; the current detection isolation circuit is connected with the overcurrent protection loop and used for receiving the current information; the current detection isolation circuit is connected with the feedback circuit and used for converting the current information into voltage information and transmitting the voltage information to the feedback circuit;
the feedback circuit is connected with the feedback input end of the overcurrent protection main control module and used for feeding the voltage information back to the overcurrent protection main control module, and the overcurrent protection main control module controls the working state of the overcurrent protection loop according to the voltage information.
2. The over-current detection protection circuit of claim 1, wherein the current detection isolation circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first end of the first resistor is respectively connected with the first end of the second resistor and the output end of the overcurrent protection main control module, the second end of the first resistor is respectively connected with the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected with the first detection end, the cathode of the second diode is connected with the first end of the third resistor, the second end of the third resistor is respectively connected with the first end of the fourth resistor, the first end of the feedback circuit and the feedback input end of the overcurrent protection main control module, the second end of the fourth resistor is connected with the negative electrode of the third diode, the positive electrode of the third diode is respectively connected with the positive electrode of the fourth diode and the second end of the second resistor, and the negative electrode of the fourth diode is connected with the second detection end.
3. The over-current detection protection circuit according to claim 2, wherein the over-current protection circuit comprises a first MOS transistor and a second MOS transistor; the drain electrode of the first MOS tube is the first detection end, the drain electrode of the second MOS tube is the second detection end, the drain electrode of the first MOS tube is connected with the cathode of the first diode, the source electrode of the first MOS tube is respectively connected with the source electrode of the second MOS tube and the low potential end of the power supply, the grid electrode of the first MOS tube is respectively connected with the grid electrode of the second MOS tube, the output end of the overcurrent protection main control module and the first end of the first resistor, and the drain electrode of the second MOS tube is connected with the cathode of the fourth diode.
4. The over-current detection protection circuit according to claim 3, wherein the feedback circuit comprises a fifth resistor and a first capacitor, a first end of the fifth resistor is connected to the feedback input terminal of the over-current protection main control module, a first end of the first capacitor, and a second end of the third resistor, respectively, and a second end of the fifth resistor is connected to the second end of the first capacitor and the low potential end of the power supply, respectively.
5. The over-current detection protection circuit according to claim 1, further comprising a switch control circuit, wherein the switch control circuit is connected to the input terminal of the over-current protection main control module, and the switch control circuit is configured to receive a switch control signal to control the operating state of the over-current protection main control module.
6. The overcurrent detection protection circuit of claim 5, wherein the switch control circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, and a first optocoupler; the first end of the sixth resistor is a control signal input end, the second end of the sixth resistor is respectively connected with the first end of the seventh resistor and the first input end of the first optocoupler, the second end of the seventh resistor is respectively connected with the second input end of the first optocoupler and a power ground, the first output end of the first optocoupler is respectively connected with the power input end of the overcurrent protection main control module and an external power supply, the second output end of the first optocoupler is respectively connected with the logic input end of the overcurrent protection main control module and the first end of the eighth resistor, and the second end of the eighth resistor is respectively connected with the logic grounding end of the overcurrent protection main control module and a low potential end of the power supply.
7. The over-current detection protection circuit according to any one of claims 1 to 6, wherein the over-current protection main control module comprises an IR21271 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922151166.4U CN211209273U (en) | 2019-12-04 | 2019-12-04 | Overcurrent detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922151166.4U CN211209273U (en) | 2019-12-04 | 2019-12-04 | Overcurrent detection protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211209273U true CN211209273U (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922151166.4U Active CN211209273U (en) | 2019-12-04 | 2019-12-04 | Overcurrent detection protection circuit |
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|---|---|
| CN (1) | CN211209273U (en) |
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2019
- 2019-12-04 CN CN201922151166.4U patent/CN211209273U/en active Active
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Effective date of registration: 20220608 Address after: 100035 No.2 Xizhimenwai street, Xicheng District, Beijing Patentee after: BEIJING SUBWAY OPERATION Corp. Patentee after: Shenzhen Tongye Technology Co., Ltd Address before: 102208 R & D center of urban rail depot, huojiaying village, Dongxiaokou Town, Changping District, Beijing Patentee before: SUBWAY OPERATION TECHNOLOGY R & D CENTER, BEIJING SUBWAY OPERATION CO.,LTD. Patentee before: Shenzhen Tongye Technology Co., Ltd |
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