CN217282181U - Direct current output protection circuit - Google Patents
Direct current output protection circuit Download PDFInfo
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- CN217282181U CN217282181U CN202122429119.9U CN202122429119U CN217282181U CN 217282181 U CN217282181 U CN 217282181U CN 202122429119 U CN202122429119 U CN 202122429119U CN 217282181 U CN217282181 U CN 217282181U
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Abstract
The utility model discloses a direct current output protection circuit, which relates to the technical field of power protection and comprises a voltage detection module, a current detection module, an instantaneous protection module, a switch control module, a circuit protection module, a main control module and an alarm module; the voltage detection module is used for detecting output voltage, the current detection module is used for detecting output current, the instantaneous protection module is used for quickly responding to faults and outputting fault signals, the switch control module is used for resetting the instantaneous protection module, the circuit protection module is used for controlling a power supply, and the main control module is used for receiving signals and outputting signals. The utility model discloses direct current output protection circuit adopts the opto-coupler to keep apart the transmission with fault signal, and the cooperation latch realizes fault signal's quick transmission, shortens the length of time that direct current circuit broke down, and the response is rapid, simple structure to adopt the work of this latch of microcontroller intelligent control and receive voltage current sampling signal, improve circuit work efficiency.
Description
Technical Field
The utility model relates to a power protection technical field specifically is a direct current output protection circuit.
Background
Along with electric power becomes the essential energy in people's life, it is important when the safe supply of direct current, when direct current system takes place to overflow, overvoltage and short-circuit fault, the damage that relevant electronic equipment receives has direct relation with the fault duration, when taking place serious overflow, overvoltage and short-circuit fault, electronic equipment can appear paralyzing or even appear burning out, it alleviates the influence of trouble to be necessary to protect the excision trouble through the wind energy fast, in present traditional output protection circuit, mostly receive the voltage current signal of sampling through microcontroller, and carry out analysis judgement circuit condition through internal software system, and then control circuit's protect function, make when serious overflow overvoltage fault, unable fast control circuit protects, lead to the circuit damage.
Disclosure of Invention
An embodiment of the utility model provides a direct current output protection circuit to solve the problem that proposes among the above-mentioned background art.
The embodiment of the utility model provides an in, provide a direct current output protection circuit, this direct current output protection circuit includes: the device comprises a voltage detection module, a current detection module, an instantaneous protection module, a switch control module, a circuit protection module, a main control module and an alarm module;
the voltage detection module is used for detecting a voltage signal output by the direct current output end;
the current detection module is used for detecting a current signal output by the direct current output end;
the instantaneous protection module is connected with the first output end of the voltage detection module and the first output end of the current detection module, and is used for receiving the voltage signal and the current signal, carrying out quick fault response and outputting a control signal;
the switch control module is connected with the control end of the instantaneous protection module and is used for closing the switch and resetting the instantaneous protection module;
the circuit protection module is connected with the output end of the instantaneous protection module and used for receiving a control signal and protecting a circuit;
the main control module is connected with the second output end of the voltage detection module and the second output end of the current detection module, is used for receiving the voltage signal and the current signal, is connected with the input end of the switch control module, and is used for controlling the switch control module to work and outputting an alarm signal;
the alarm module is connected with the alarm end of the main control module and used for receiving alarm signals and giving an alarm
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses direct current output protection circuit adopts the opto-coupler to keep apart the transmission with fault signal, avoids signal mutual interference, and the quick transmission of fault signal is realized to the cooperation latch, shortens when direct current circuit breaks down, and the response is rapid, simple structure to adopt the work of this latch of microcontroller intelligent control and receive voltage current sampling signal, improve this direct current output protection circuit work efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a dc output protection circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a dc output protection circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of the current detection module provided in fig. 2.
Reference numerals are as follows: 1. a voltage detection module; 2. a current detection module; 3. an instantaneous protection module; 4. a switch control module; 5. a circuit protection module; 6. a main control module; 7. and an alarm module.
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.
Example 1: referring to fig. 1, an embodiment of the present invention provides a dc output protection circuit, which includes: the device comprises a voltage detection module 1, a current detection module 2, an instantaneous protection module 3, a switch control module 4, a circuit protection module 5, a main control module 6 and an alarm module 7;
specifically, the voltage detection module 1 is configured to detect a voltage signal output by a dc output terminal;
the current detection module 2 is used for detecting a current signal output by the direct current output end;
the instantaneous protection module 3 is connected with the first output end of the voltage detection module 1 and the first output end of the current detection module 2, and is used for receiving the voltage signal and the current signal, performing quick fault response and outputting a control signal;
the switch control module 4 is connected with the control end of the instantaneous protection module 3 and is used for closing a switch and resetting the instantaneous protection module 3;
the circuit protection module 5 is connected with the output end of the instantaneous protection module 3 and used for receiving a control signal and protecting a circuit;
the main control module 6 is connected with the second output end of the voltage detection module 1 and the second output end of the current detection module 2, is used for receiving the voltage signal and the current signal, is connected with the input end of the switch control module 4, is used for controlling the switch control module 4 to work, and is used for outputting an alarm signal;
and the alarm module 7 is connected with the alarm end of the main control module 6 and used for receiving an alarm signal and giving an alarm.
In a specific embodiment, the voltage detection module 1 may employ a hall voltage sensor U2 to sample a voltage, and perform amplification processing on a signal through an operational amplifier; the current detection module 2 can adopt a sampling resistor to match with an operational amplifier to detect a current signal and output a voltage signal; the instantaneous protection module 3 can use a comparator to compare threshold values, and realize the rapid transmission of fault signals through a photoelectric coupler and a latch U3; the circuit protection module 5 is a power control module of the dc output protection circuit, and immediately turns off a circuit power supply after receiving a fault signal, which is not described herein; the switch control module 4 can control the work of the instantaneous protection module 3 by adopting a simple mode of isolating and controlling a switch tube by a photoelectric coupler; the main control module 6 can adopt a singlechip to receive and process signals and output alarm signals or expand functions; the alarm module 7 may be an audible and visual alarm, which is not described herein.
Example 2: based on embodiment 1, please refer to fig. 2, in an embodiment of the dc output protection circuit of the present invention, the voltage detection module 1 includes a first resistor R1, a first power supply +15V, a second power supply-15V, a voltage sensor U2, a second resistor R2, a third resistor R3, a first capacitor C1, a first operational amplifier a1, a fourth resistor R4, and a second capacitor C2;
specifically, one end of the first resistor R1 and the second input end of the voltage sensor U2 are both connected to a dc output end, the first input end of the voltage sensor U2 is connected to the other end of the first resistor R1, power ends of the voltage sensor U2 are respectively connected to +15V of the first power supply and-15V of the second power supply, an output end of the first sensor is connected to one end of the second resistor R2 and one end of the third resistor R3, the other end of the second resistor R2 is connected to one end of the first capacitor C1 and the same-phase end of the first operational amplifier a1, the other end of the third resistor R3 and the other end of the first capacitor C1 are both grounded, the inverting end of the first operational amplifier a1 is connected to one end of the second capacitor C2 and one end of the fourth resistor R4, and an output end of the first operational amplifier a1 is connected to the other end of the second capacitor C2 and the other end of the fourth resistor R4.
Further, the transient protection module 3 includes a fifth resistor R5, a third power supply +5V, a second operational amplifier a2, a potentiometer RP1, a first isolator J1, a sixth resistor R6, a seventh resistor R7, a fourth power supply +5V, and a latch U3;
specifically, one end of the fifth resistor R5 is connected to the inverting terminal of the second operational amplifier a2 and one end of the potentiometer RP1, the other end of the potentiometer RP1 and the sliding piece terminal are both grounded, the non-inverting terminal of the second operational amplifier a2 is connected to the output terminal of the first operational amplifier a1, the output terminal of the second operational amplifier a2 is connected to the first terminal of the first isolator J1, the second terminal of the first isolator J1 is grounded through the sixth resistor R6, the third terminal of the first isolator J1 is connected to the +5V of the fourth power supply, and the fourth terminal of the first isolator J1 is connected to the first input terminal of the latch U3 and grounded through the seventh resistor R7.
Further, the switch control module 4 includes a first switch tube P1, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second isolator J2, an eleventh resistor R11, a second switch tube N1, a twelfth resistor R12, a fifth power supply +5V, and a sixth power supply VCC;
specifically, the emitter of the first switch tube P1 is connected to the fourth power supply +5V, the collector of the first switch tube P1 is connected to the second input terminal of the latch U3 and is grounded through the eighth resistor R8, the base of the first switch tube P1 is connected to one end of the ninth resistor R9 and the third end of the second isolator J2, the other end of the ninth resistor R9 is connected to the fifth power supply +5V, the fourth end of the second isolator J2 is grounded through the eleventh resistor R11, the first end of the second isolator J2 is connected to the sixth power supply VCC through the tenth resistor R10, the second end of the second isolator J2 is connected to the collector of the second switch tube N1, the emitter of the second switch tube N1 is grounded, and the base of the second switch tube N1 is connected to the first end of the twelfth resistor R12.
Further, the current detection module 2 includes a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a third operational amplifier A3, and an eighteenth resistor R18;
specifically, one end of a thirteenth resistor R13 and one end of a fifteenth resistor R15 are connected to a direct current output end, the other end of the thirteenth resistor R13 is connected to one end of a sixteenth resistor R16 and is directly connected through the fourteenth resistor R14, the other end of the fifteenth resistor R15 is connected to the in-phase end of a third operational amplifier a3 and is grounded through a seventeenth resistor R17, the other end of the sixteenth resistor R16 is connected to the inverting end of the third operational amplifier a3 and one end of an eighteenth resistor R18, and the output end of the third operational amplifier a3 is connected to the other end of the eighteenth resistor R18.
Further, the main control module 6 includes a first controller U1;
specifically, a first IO terminal of the first controller U1 is connected to a second terminal of the twelfth resistor R12, a first analog-to-digital terminal of the first controller U1 is connected to an output terminal of the first operational amplifier a1, and a second analog-to-digital terminal of the first controller U1 is connected to an output terminal of the third operational amplifier A3.
In a specific embodiment, the voltage sensor U2 can be selected from HFV25-P Hall voltage sensor U2, and a +15V and-15V dual power supply is adopted for supplying power; the first operational amplifier A1 can select an OP07 operational amplifier to amplify the voltage signal output by the Hall voltage sensor U2; the third operational amplifier a3 can be an OP07 operational amplifier; the second operational amplifier A2 can select an LM339 comparator for judging and outputting a fault signal; the first isolator J1 and the second isolator J2 can be driven in an isolated manner by using a TLP521 or a 6N137 photocoupler, and here, a TLP521 coupler is used to realize isolated signal transmission; the first switch tube P1 can be a PNP triode, and the second switch tube N1 can be an NPN triode, both of which are used as switch tubes; the latch U3 can adopt SR latch to realize the rapid trigger of analog quantity instantaneous value; the first controller U1 can use an STC89C52 single chip microcomputer to receive and process signals.
In the embodiment of the utility model, the DC output circuit is used for detecting voltage and current by the voltage detection module 1 and the current detection module 2, the detected voltage signal and current signal are transmitted to the main control module 6 and the instantaneous protection module 3, the instantaneous protection module 3 judges whether the received voltage and current signal reaches the output threshold value by the comparator, when the voltage and current signal reaches the output threshold value, a fault signal is output, the rapid triggering of the analog quantity instantaneous value is carried out through a photoelectric coupler and a latch U3, a trigger circuit protection module 5 cuts off the power supply to carry out circuit protection, a main control module 6 receives the detected voltage and current signals, an internal memory is used for storing signal data, an internal software system judges and controls an alarm module 7 to give an alarm, when the circuit is recovered to be normal, the main control module 6 controls the switch control module 4 to reset the instantaneous protection module 3, and the fault protection function is stopped; in the transient protection module 3, the latch U3 adopts an SR latch, when the circuit is normal, the first isolator J1 is not turned on, the latch U3 does not operate, and when a fault occurs, the first isolator J1 is turned on, the first end of the latch U3 goes high, the output end of the latch U3 outputs high and is stably maintained until the second end of the latch U3 inputs high, and the latch U3 is reset.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (6)
1. A kind of direct current output protective circuit, characterized by:
the direct current output protection circuit includes: the device comprises a voltage detection module, a current detection module, an instantaneous protection module, a switch control module, a circuit protection module, a main control module and an alarm module;
the voltage detection module is used for detecting a voltage signal output by the direct current output end;
the current detection module is used for detecting a current signal output by the direct current output end;
the instantaneous protection module is connected with the first output end of the voltage detection module and the first output end of the current detection module, and is used for receiving the voltage signal and the current signal, carrying out quick fault response and outputting a control signal;
the switch control module is connected with the control end of the instantaneous protection module and is used for closing the switch and resetting the instantaneous protection module;
the circuit protection module is connected with the output end of the instantaneous protection module and used for receiving a control signal and protecting a circuit;
the main control module is connected with the second output end of the voltage detection module and the second output end of the current detection module, is used for receiving the voltage signal and the current signal, is connected with the input end of the switch control module, and is used for controlling the switch control module to work and outputting an alarm signal;
and the alarm module is connected with the alarm end of the main control module and used for receiving the alarm signal and giving an alarm.
2. The direct current output protection circuit according to claim 1, wherein the voltage detection module comprises a first resistor, a first power supply, a second power supply, a voltage sensor, a second resistor, a third resistor, a first capacitor, a first operational amplifier, a fourth resistor and a second capacitor;
the direct current output end is all connected to the one end of first resistance and voltage sensor's second input, the other end of first resistance is connected to voltage sensor's first input, first power and second power are connected respectively to voltage sensor's power end, the one end of second resistance and the one end of third resistance are connected to the output of first sensor, the one end of first electric capacity and the homophase end that first fortune was put are connected to the other end of second resistance, the other end of third resistance and the other end of first electric capacity all ground connection, the one end of second electric capacity and the one end of fourth resistance are connected to the inverting terminal that first fortune was put, the other end of second electric capacity and the other end of fourth resistance are connected to the output that first fortune was put.
3. The direct current output protection circuit according to claim 1, wherein the current detection module comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a third operational amplifier and an eighteenth resistor;
one end of the thirteenth resistor and one end of the fifteenth resistor are connected with the direct current output end, the other end of the thirteenth resistor is connected with one end of the sixteenth resistor and is direct through the fourteenth resistor, the other end of the fifteenth resistor is connected with the in-phase end of the third operational amplifier and is grounded through the seventeenth resistor, the other end of the sixteenth resistor is connected with the inverting end of the third operational amplifier and one end of the eighteenth resistor, and the output end of the third operational amplifier is connected with the other end of the eighteenth resistor.
4. The direct current output protection circuit according to claim 2, wherein the transient protection module comprises a fifth resistor, a third power supply, a second operational amplifier, a potentiometer, a first isolator, a sixth resistor, a seventh resistor, a fourth power supply and a latch;
the one end of fifth resistance is connected the inverting terminal that the second fortune was put and the one end of potentiometre, and the other end and the gleitbretter end of potentiometre are all grounded, and the homophase end that the second fortune was put is connected the output that first fortune was put, and the first end of first isolator is connected to the output that the second fortune was put, and the second end of first isolator is through sixth resistance ground connection, and the fourth end of first isolator is connected the fourth power, and the fourth end of first isolator connects the first input of latch and is through seventh resistance ground connection.
5. The direct current output protection circuit according to claim 4, wherein the switch control module comprises a first switch tube, an eighth resistor, a ninth resistor, a tenth resistor, a second isolator, an eleventh resistor, a second switch tube, a twelfth resistor, a fifth power supply and a sixth power supply;
the emitter of the first switch tube is connected with the fourth power supply, the collector of the first switch tube is connected with the second input end of the latch and is grounded through the eighth resistor, the base of the first switch tube is connected with one end of the ninth resistor and the third end of the second isolator, the other end of the ninth resistor is connected with the fifth power supply, the fourth end of the second isolator is grounded through the eleventh resistor, the first end of the second isolator is connected with the sixth power supply through the tenth resistor, the second end of the second isolator is connected with the collector of the second switch tube, the emitter of the second switch tube is grounded, and the base of the second switch tube is connected with the first end of the twelfth resistor.
6. The DC output protection circuit of claim 5, wherein the main control module comprises a first controller;
the first IO end of the first controller is connected with the second end of the twelfth resistor, the first analog-digital end of the first controller is connected with the output end of the first operational amplifier, and the second analog-digital end of the first controller is connected with the output end of the third operational amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122429119.9U CN217282181U (en) | 2021-10-09 | 2021-10-09 | Direct current output protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122429119.9U CN217282181U (en) | 2021-10-09 | 2021-10-09 | Direct current output protection circuit |
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| CN217282181U true CN217282181U (en) | 2022-08-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559610A (en) * | 2024-01-10 | 2024-02-13 | 云南山高新能源有限公司 | Emergency protection system for electric automobile during high-voltage charging |
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2021
- 2021-10-09 CN CN202122429119.9U patent/CN217282181U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117559610A (en) * | 2024-01-10 | 2024-02-13 | 云南山高新能源有限公司 | Emergency protection system for electric automobile during high-voltage charging |
| CN117559610B (en) * | 2024-01-10 | 2024-03-19 | 云南山高新能源有限公司 | Emergency protection system for electric automobile during high-voltage charging |
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