CN205263645U - Fault detection circuit - Google Patents
Fault detection circuit Download PDFInfo
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- CN205263645U CN205263645U CN201521105394.3U CN201521105394U CN205263645U CN 205263645 U CN205263645 U CN 205263645U CN 201521105394 U CN201521105394 U CN 201521105394U CN 205263645 U CN205263645 U CN 205263645U
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- photoelectrical coupler
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Abstract
The utility model discloses a fault detection circuit, its characterized in that: detection circuitry include controller output's pulse signal pulse+, pulse - to optoelectronic coupler E1, single monostable flip -flop D1 exported fault -signal after optoelectronic coupler E1 received single monostable flip -flop D1. Since the above structure is adopted, the utility model discloses the circuit is simple, the device is small, with low costs, and the working property is reliable. Whether the state that only need detect D1's 4 feet during the use can be the trouble of controller in order to judge to accomplish corresponding trouble response action as required.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of failure detector circuit.
Background technology
Along with increasing electronic product is using microcontroller (MCU) as technological core, microcontroller(MCU) become the power that promotes digitlization process. Its application at control field is also more and more extensive.
Along with control system becomes increasingly complex, performance requirement is also more and more higher. But due to control system workAt the environment of strong electromagnetic, be not subject to electromagnetic interference unavoidably and occur that numerical control program runs the phenomenon that flies or crash, thisTime control circuit there will be uncertain state of a control; And this phenomenon will cause system normally to work,And control personnel are difficult to judge to be what induced fault.
For the problems referred to above, a kind of novel testing circuit is provided, help control personnel to get rid of fast controllerFault.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of failure detector circuit, help control peopleMember gets rid of controller failure fast.
For achieving the above object, the technical solution of the utility model is, a kind of failure detector circuit, its featureBe: described testing circuit comprises that pulse signal Pulse+, the Pulse-of controller output are to photoelectric couplingDevice E1; After photoelectrical coupler E1 receives monostable flipflop D1, monostable flipflop D1 output fault is believedNumber.
Described controller output pulse signal Pulse+ series electrical accesses photoelectrical coupler E1's after resistance R11 pin.
The 2 pin parallel diode V1 of 1 pin of described photoelectrical coupler E1 and photoelectrical coupler E1, electric capacityC1; 6 pin of photoelectrical coupler E1 meet power supply VCC; 4 pin of photoelectrical coupler E1 are received by resistance R 2Power supply VCC; 5 pin of photoelectrical coupler E1 connect the ground of power supply; Between 4 pin and 5 pin of photoelectrical coupler E1Shunt capacitance C2.
After 2 pin of described monostable flipflop D1 and 3 pin short circuits, receive power supply VCC, monostable flipflopShunt capacitance C3 between 14 pin of D1 and 15 pin, 15 pin of monostable flipflop D1 are received resistance R 4, electricityThe other end of resistance R4 is received power supply VCC; 16 pin of monostable flipflop D1 are received power supply VCC, monostable8 pin of trigger D1 are received the ground of power supply; Shunt capacitance between 8 pin of monostable flipflop D1 and 16 pinC4; 13 pin of monostable flipflop D1 are received resistance R 3, and an other end of resistance R 3 is received the negative electrode of V2,The anode of V2 is received power supply VCC.
A kind of failure detector circuit, owing to adopting above-mentioned structure, the utility model circuit is simple, device bodyLong-pending little, cost is low, reliable working performance. The state that only need to detect 4 pin of D1 when use can be sentencedWhether disconnected is the fault of controller, thereby completes as required corresponding failure response action.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;
Fig. 1 is the circuit diagram of a kind of failure detector circuit of the utility model.
Detailed description of the invention
The utility model only need add a control I/O to export at controller (MCU) software main program entranceProgram, controls one of them pin cycle low and high level and changes, as long as it does not change and think that this is micro-in the cycleController (MCU) fault. Its volume is little, circuit is simply easily realized and it is stable and reliable for performance.
The utility model is by optical coupling isolation circuit, monostable flipflop the electric circuit constitute. It is characterized in that when inputWhile changing clock signal for cycle low and high level, its reverse output can produce negative pulse, can regulate outer powering upCapacitance-resistance value is set the width of negative pulse, and the one-period that is greater than input pulse when the width of negative pulse alsoWhile being less than two cycles, output is being not negative pulse sequence, but a low level is worked as input clock signalSuddenly when no longer there is low and high level and changing, output in the end after an end-of-pulsing redirect be high level. FromAnd make corresponding safeguard measure. Due to the design of optical coupling isolation circuit, make this failure detector circuit and controlDevice processed (MCU) isolation, has effectively solved by failure detector circuit and has introduced and interfere with controller (MCU),Improve the job stability of controller (MCU). The utility model circuit is simple and practical, because circuit adoptsOne group of Power supply, thus device volume is reduced greatly, reduce the complexity of power circuit design,Improve the reliability of system.
Specifically as shown in Figure 1, after the pulse signal Pulse+ series resistance R1 of controller (MCU) output, connectTo 1 pin of photoelectrical coupler E1, the pulse input signal Pulse-of controller (MCU) output receives photoelectricity2 pin of coupler E1, the 2 pin parallel diode V1 of 1 pin of photoelectrical coupler E1 and photoelectrical coupler E1,Capacitor C 1; 6 pin of photoelectrical coupler E1 meet power supply VCC, and 4 pin of photoelectrical coupler E1 are by resistance R 2Receive power supply VCC, receive 1 pin of monostable flipflop D1 simultaneously; 5 pin of photoelectrical coupler E1 connect power supplyGround, shunt capacitance C2 between 4 pin of photoelectrical coupler E1 and 5 pin; 2 pin of monostable flipflop D1With after 3 pin short circuits, receive power supply VCC, shunt capacitance C3 between 14 pin of monostable flipflop D1 and 15 pin,15 pin of monostable flipflop D1 are received the other end of resistance R 4, resistance R 4 and are received power supply VCC; Monostable16 pin of trigger D1 are received power supply VCC, and 8 pin of monostable flipflop D1 are received the ground of power supply; MonostableShunt capacitance C4 between 8 pin of state trigger D1 and 16 pin; 13 pin of monostable flipflop D1 are received electricityResistance R3, an other end of resistance R 3 is received the negative electrode of V2, and the anode of V2 is received power supply VCC, and monostable is touchedThe 4 pin fault outputs of hair device D1. This microcontroller failure detector circuit, its circuit is simple, device volumeLittle, cost is low, reliable working performance. When use, only need to detect the shape of 4 pin of monostable flipflop D1State can judge whether it is the fault of controller (MCU), thereby completes as required corresponding failure responseAction.
By reference to the accompanying drawings the utility model is exemplarily described above, obviously the utility model specific implementationBe not subject to the restrictions described above, if the various improvement that adopted technical solutions of the utility model to carry out, orDirectly apply to other occasion without improvement, all within protection domain of the present utility model.
Claims (4)
1. a failure detector circuit, is characterized in that: described testing circuit comprises the arteries and veins of controller outputRush signal Pulse+, Pulse-to photoelectrical coupler E1; Photoelectrical coupler E1 receives monostable triggerMonostable flipflop D1 output fault-signal after device D1.
2. a kind of failure detector circuit according to claim 1, is characterized in that: described controllerOutput pulse signal Pulse+ series electrical accesses 1 pin of photoelectrical coupler E1 after R1 to resistance.
3. a kind of failure detector circuit according to claim 1, is characterized in that: described photoelectricity couplingClose 2 pin parallel diode V1, the capacitor C 1 of 1 pin and the photoelectrical coupler E1 of device E1; Photoelectrical coupler E16 pin meet power supply VCC; 4 pin of photoelectrical coupler E1 are received power supply VCC by resistance R 2; Photoelectric coupling5 pin of device E1 connect the ground of power supply; Shunt capacitance C2 between 4 pin of photoelectrical coupler E1 and 5 pin.
4. a kind of failure detector circuit according to claim 1, is characterized in that: described monostableAfter 2 pin of trigger D1 and 3 pin short circuits, receive power supply VCC, 14 pin of monostable flipflop D1 and 15 pinBetween shunt capacitance C3,15 pin of monostable flipflop D1 are received another termination of resistance R 4, resistance R 4To power supply VCC; 16 pin of monostable flipflop D1 are received power supply VCC, 8 pin of monostable flipflop D1Receive the ground of power supply; Shunt capacitance C4 between 8 pin of monostable flipflop D1 and 16 pin; Monostable trigger13 pin of device D1 are received resistance R 3, and an other end of resistance R 3 is received the negative electrode of V2, and the anode of V2 is receivedPower supply VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521105394.3U CN205263645U (en) | 2015-12-25 | 2015-12-25 | Fault detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521105394.3U CN205263645U (en) | 2015-12-25 | 2015-12-25 | Fault detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205263645U true CN205263645U (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521105394.3U Active CN205263645U (en) | 2015-12-25 | 2015-12-25 | Fault detection circuit |
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| CN (1) | CN205263645U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064719A (en) * | 2017-06-02 | 2017-08-18 | 北京华峰测控技术有限公司 | A kind of Kelvin's connecting fault detection circuit and method |
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2015
- 2015-12-25 CN CN201521105394.3U patent/CN205263645U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064719A (en) * | 2017-06-02 | 2017-08-18 | 北京华峰测控技术有限公司 | A kind of Kelvin's connecting fault detection circuit and method |
| CN107064719B (en) * | 2017-06-02 | 2023-09-19 | 北京华峰测控技术有限公司 | Kelvin connection fault detection circuit and method |
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