CN203800559U - Quick protection circuit for short circuit - Google Patents
Quick protection circuit for short circuit Download PDFInfo
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- CN203800559U CN203800559U CN201320840880.4U CN201320840880U CN203800559U CN 203800559 U CN203800559 U CN 203800559U CN 201320840880 U CN201320840880 U CN 201320840880U CN 203800559 U CN203800559 U CN 203800559U
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Abstract
The utility model relates to a quick protection circuit for short circuit, and the circuit is formed by the connection of a reference voltage circuit, a voltage window comparison circuit, a signal latching output circuit, and a power-on protection output circuit. The reference voltage circuit consists of a resistor R1, a resistor R2, a resistor R3, a nonpolar capacitor C1, and a nonpolar capacitor C2. The voltage window comparison circuit is formed by the connection of a voltage comparator U1A, a voltage comparator U1B, a voltage comparator U1C,a voltage comparator U1D, a resistor R4, a resistor R5, a nonpolar capacitor C3, and a diode D1. The signal latching output circuit is formed by the connection of double-input NAND gates U2A, U2B, and U2C. The power-on protection output circuit is formed by the connection of a resistor R6, a polar capacitor E1, and a double-input NAND gate U2D. The circuit provided by the utility model is simple in structure, is reasonable in design, is high in speed of response, is high in practicality, is low in manufacture, is low in energy consumption of application, is simple in circuit adjustment, is stable and reliable in performance, and is wide in range of application.
Description
Technical field
The utility model relates to a kind of short circuit current protective circuit, particularly a kind of fast current short-circuit protection circuit.
Background technology
At present; in big-power transducer, inverter universal circuit; to short circuit current protection finished product isolation drive device or the drive plates that adopt belt current short-circuit protection function of power device, it is with high costs, cannot in the low power product of low cost, use in a large number more.Some are the relatively current sensor output signals that adopt of short circuit current protective circuit cheaply more; detect the twinkling signal that exceedes Calibrated current; trigger microprocessor external interrupt; cut off the control to power device by microprocessor again; reach the object of protection power device; the speed of its response of pattern of this short-circuit protection circuit and the speed of service of microprocessor; software programming, external hardware response speed are relevant with the multiple links such as current signal duration that exceed standard, and this protective circuit does not possess the safeguard measure of powering on conventionally.In actual use, this protective circuit, because software and hardware loop is too much, protects failed probability very high, has in the use very large potential safety hazard.
Therefore, provide a kind of simple in structure, reasonable in design, apply easy, the significant fast current short-circuit protection circuit of effect, be one of this technical field scientific research personnel problem that should address.
Utility model content
The purpose of this utility model is to overcome above-mentioned weak point, provides a kind of circuit structure simple, reasonable in design, and fast response time is practical strong, low cost of manufacture, fast current short-circuit protection circuit stable and reliable for performance, applied widely.
The technical scheme that the utility model adopts is for achieving the above object: a kind of fast current short-circuit protection circuit, is characterized in that this circuit is connected to form by reference voltage circuit, voltage window comparison circuit, signal latch output circuit and upper electric protection output circuit;
Described reference voltage circuit is connected to form by resistance R 1, R2, R3, capacitor C 1, C2; Described voltage window comparison circuit is connected to form by voltage comparator U1A, U1B, U1C, U1D, resistance R 4, R5, capacitor C 3 and diode D1; The rest-set flip-flop that described signal latch output circuit is connected by two input nand gate U2A, U2B forms with the not circuit that two input nand gate U2C are connected; The described guard signal output circuit that powers on is connected to form by resistance R 6, electric capacity E1, two input nand gate U2D.
The beneficial effects of the utility model are: this fast current short-circuit protection circuit be to two in frequency converter or inverter three-phase output current or all three-phase carry out current acquisition, whole three phase power output devices is protected; Its circuit design is simple, reasonable, fast response time, and applicability is strong, low cost of manufacture, Energy in use is low, is difficult for disturbing other circuit or being disturbed by other circuit; And the regulation of electrical circuit is simple, stable and reliable for performance, applied widely.
Brief description of the drawings
Fig. 1 is the schematic diagram of the utility model circuit.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to the embodiment providing according to the utility model, structure, feature, details are as follows:
Referring to Fig. 1, a kind of fast current short-circuit protection circuit, this circuit is connected to form by reference voltage circuit, voltage window comparison circuit, signal latch output circuit and upper electric protection output circuit;
Described reference voltage circuit is connected to form by resistance R 1, R2, R3, polarity free capacitor C1, C2; Described voltage window comparison circuit is connected to form by voltage comparator U1A, U1B, U1C, U1D, resistance R 4, R5, polarity free capacitor C3 and diode D1; The rest-set flip-flop that described signal latch output circuit is connected by two input nand gate U2A, U2B forms with the not circuit that two input nand gate U2C are connected; The described guard signal output circuit that powers on by resistance R 6, have polar capacitor E1, two input nand gate U2D to connect to form.
This circuit is provided with two inputs, two outputs and power supply positive-negative input end; Circuit is divided into following four parts.
Part I is reference voltage circuit: reference voltage circuit is that one end of resistance R 1 is connected to positive supply, the other end of resistance R 1 is connected with resistance R 2 one end and connects and draw positive reference voltage source+Ref with one end of polarity free capacitor C1, the other end of polarity free capacitor C1 is connected to power supply ground, aligns reference voltage source and carries out filtering; The other end of resistance R 2 is connected with one end of resistance R 3 and connects and draw negative reference voltage source-Ref with one end of polarity free capacitor C2, and the other end of polarity free capacitor C2 is connected to power supply ground, and negative reference voltage source is carried out to filtering; The other end of resistance R 3 is connected to negative supply.
Part II is voltage window comparison circuit: IV phase voltage window comparator circuit is that voltage comparator U1A negative input end the 6th pin connection voltage comparator U1B positive input terminal the 5th pin is drawn the voltage detecting input that label is IV, voltage comparator U1A positive input terminal the 7th pin is connected to positive reference voltage source+Ref, as the voltage window comparator comparative voltage upper limit, voltage comparator U1B negative input end the 4th pin connects negative reference voltage source-Ref, as voltage window comparator comparative voltage lower limit; IW phase voltage window comparator circuit is that voltage comparator U1C positive input terminal the 9th pin connection voltage comparator U1D negative input end the 10th pin is drawn the voltage detecting input that label is IW, voltage comparator U1C negative input end the 8th pin connects negative reference voltage source-Ref, as voltage window comparator comparative voltage lower limit, voltage comparator U1D positive input terminal the 11st pin connects positive reference voltage source+Ref, as the voltage window comparator comparative voltage upper limit; Lou Lou output the 13rd pin of opening of output the 14th pin and voltage comparator U1D of opening of opening Lou output the 2nd pin, voltage comparator U1C of opening Lou output the 1st pin, voltage comparator U1B of voltage comparator U1A connects together, and draws logic OR relation and label and is the voltage comparison signal of OCO and open leakage output.One end of resistance R 4 is connected to positive supply, the anodic bonding of the other end of resistance R 4 and diode D1 and to be connected to label be that the voltage comparison signal of OCO is opened leakage output, the negative electrode of diode D1 is connected with one end of resistance R 5 and is connected with one end of polarity free capacitor C3, drawing label is the short-circuit alarming signal end of OA, the other end of the other end of resistance R 5 and polarity free capacitor C3 is connected to power supply ground, resistance R 4, R5 carries out dividing potential drop to positive supply, to obtain the signal that meets logical circuit processing, diode D1 is in the time of comparison circuit output low signal, avoid comparison circuit to export negative voltage signal to digital circuit, polarity free capacitor C3 carries out filtering to output signal, prevent from disturbing circuit is exerted an influence and makes circuit erroneous action.
Part III is signal latch output circuit: the rest-set flip-flop that this part is connected by two input nand gate U2A, U2B forms with the not circuit that two input nand gate U2C are connected.An input the 1st pin of two input nand gate U2A is rest-set flip-flop set end, can inject a low level signal to this signal input part at protective circuit action preprocessor, makes protective circuit return to normal operating conditions.An input the 5th pin of two input nand gate U2B is clear terminal, being connected to label is the short-circuit signal output of OA, the output of two input nand gate U2B the 6th pin is signal latch output, in the time of short-circuit signal output output low level signal that label is OA, this output output high level signal latch.Two inputs the 9th pin and the 10th pin short circuit of two input nand gate U2C make two input nand gate U2C become signals reverse device, two inputs of U2C are connected to the 6th pin of rest-set flip-flop assembly U2B, and it is that the low level alarm signal of Err detects for microprocessor that the signal of latch is oppositely exported to label through the 8th pin of U2C.
Part IV is for powering on guard signal output circuit: this part connects digital circuit power source by one end of resistance R 6, the anode that the other end of resistance R 6 is connected with polar capacitor E1 is drawn the guard signal that powers on and is connected to input of two input nand gate U2D the 13rd pin, two another input of input nand gate U2D the 12nd pin are connected with output the 8th pin of two input nand gate U2C, the output of two input nand gate U2D the 11st pin is drawn the bus control signal that label is CS, and the 2nd pin of electric capacity E1 connects power supply ground; Only all in normal situation, just enable bus driver device, the signal controlling of enabled microprocessor to power device at power on guard signal and short-circuit protection signal.When circuit is in electrification reset or short-circuit alarming signal when effective, bus control signal is high level, and forbidden energy bus driver device cuts off the control signal of microprocessor to power device with hardware mode, power device is reliably ended, thereby reach protection effect.
Above-mentionedly with reference to embodiment, fast current short-circuit protection circuit being described in detail, is illustrative instead of determinate, therefore in the variation and the amendment that do not depart under the utility model general plotting, within should belonging to protection range of the present utility model.
Claims (1)
1. a fast current short-circuit protection circuit, is characterized in that this circuit is connected to form by reference voltage circuit, voltage window comparison circuit, signal latch output circuit and upper electric protection output circuit;
Described reference voltage circuit is connected to form by resistance R 1, R2, R3, capacitor C 1, C2; Described voltage window comparison circuit is connected to form by voltage comparator U1A, U1B, U1C, U1D, resistance R 4, R5, capacitor C 3 and diode D1; The rest-set flip-flop that described signal latch output circuit is connected by two input nand gate U2A, U2B forms with the not circuit that two input nand gate U2C are connected; The described guard signal output circuit that powers on is connected to form by resistance R 6, electric capacity E1, two input nand gate U2D;
Described reference voltage circuit is that one end of resistance R 1 is connected to positive supply, the other end of resistance R 1 is connected with resistance R 2 one end and connects and draw positive reference voltage source+Ref with one end of capacitor C 1, the other end of capacitor C 1 is connected to power supply ground, aligns reference voltage source and carries out filtering; The other end of resistance R 2 is connected with one end of resistance R 3 and connects and draw negative reference voltage source-Ref with one end of capacitor C 2, and the other end of capacitor C 2 is connected to power supply ground, and negative reference voltage source is carried out to filtering; The other end of resistance R 3 is connected to negative supply;
Described voltage window comparison circuit IV draws for voltage comparator U1A negative input end the 6th pin connects voltage comparator U1B positive input terminal the 5th pin the voltage detecting input that label is IV mutually, voltage comparator U1A positive input terminal the 7th pin is connected to positive reference voltage source+Ref, as the voltage window comparator comparative voltage upper limit, voltage comparator U1B negative input end the 4th pin connects negative reference voltage source-Ref, as voltage window comparator comparative voltage lower limit, voltage window comparison circuit IW draws for voltage comparator U1C positive input terminal the 9th pin connects voltage comparator U1D negative input end the 10th pin the voltage detecting input that label is IW mutually, voltage comparator U1C negative input end the 8th pin connects negative reference voltage source-Ref, as voltage window comparator comparative voltage lower limit, voltage comparator U1D positive input terminal the 11st pin connects positive reference voltage source+Ref, as the voltage window comparator comparative voltage upper limit, Lou Lou output the 13rd pin of opening of output the 14th pin and voltage comparator U1D of opening of opening Lou output the 2nd pin, voltage comparator U1C of opening Lou output the 1st pin, voltage comparator U1B of voltage comparator U1A connects together, and draws logic OR relation and label and is the voltage comparison signal of OCO and open leakage output, one end of resistance R 4 is connected to positive supply, the anodic bonding of the other end of resistance R 4 and diode D1 and to be connected to label be that the voltage comparison signal of OCO is opened leakage output, the negative electrode of diode D1 is connected with one end of resistance R 5 and is connected with one end of capacitor C 3, drawing label is the short-circuit alarming signal end of OA, the other end of the other end of resistance R 5 and capacitor C 3 is connected to power supply ground, resistance R 4, R5 carries out dividing potential drop to positive supply, to obtain the signal that meets logical circuit processing, diode D1 is in the time of comparison circuit output low signal, avoid comparison circuit to export negative voltage signal to digital circuit, capacitor C 3 is carried out filtering to output signal, prevent from disturbing circuit is exerted an influence and makes circuit erroneous action,
In described signal latch output circuit, an input the 1st pin of two input nand gate U2A is rest-set flip-flop set end, can inject a low level signal to this signal input part at protective circuit action preprocessor, makes protective circuit return to normal operating conditions; An input the 5th pin of two input nand gate U2B is clear terminal, being connected to label is the short-circuit signal output of OA, the output of two input nand gate U2B the 6th pin is signal latch output, in the time of short-circuit signal output output low level signal that label is OA, this output output high level signal latch; Two inputs the 9th pin and the 10th pin short circuit of two input nand gate U2C make two input nand gate U2C become signals reverse device, two inputs of U2C are connected to the 6th pin of rest-set flip-flop assembly U2B, and it is that the low level alarm signal of Err detects for microprocessor that the signal of latch is oppositely exported to label through the 8th pin of U2C;
The described guard signal output circuit that powers on connects digital circuit power source by one end of resistance R 6; the anode of the other end connection electric capacity E1 of resistance R 6 is drawn the guard signal that powers on and is connected to input of two input nand gate U2D the 13rd pin; two another input of input nand gate U2D the 12nd pin are connected with output the 8th pin of two input nand gate U2C; the output of two input nand gate U2D the 11st pin is drawn the bus control signal that label is CS, and the negative electrode of electric capacity E1 connects power supply ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320840880.4U CN203800559U (en) | 2013-12-19 | 2013-12-19 | Quick protection circuit for short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320840880.4U CN203800559U (en) | 2013-12-19 | 2013-12-19 | Quick protection circuit for short circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203800559U true CN203800559U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320840880.4U Expired - Fee Related CN203800559U (en) | 2013-12-19 | 2013-12-19 | Quick protection circuit for short circuit |
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| CN (1) | CN203800559U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111384704A (en) * | 2018-12-27 | 2020-07-07 | 沈阳新松机器人自动化股份有限公司 | Load short circuit self-locking protection circuit |
-
2013
- 2013-12-19 CN CN201320840880.4U patent/CN203800559U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111384704A (en) * | 2018-12-27 | 2020-07-07 | 沈阳新松机器人自动化股份有限公司 | Load short circuit self-locking protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20161219 |
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| CF01 | Termination of patent right due to non-payment of annual fee |