CN101609127B - Relay fault detection circuit - Google Patents
Relay fault detection circuit Download PDFInfo
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- CN101609127B CN101609127B CN 200910041360 CN200910041360A CN101609127B CN 101609127 B CN101609127 B CN 101609127B CN 200910041360 CN200910041360 CN 200910041360 CN 200910041360 A CN200910041360 A CN 200910041360A CN 101609127 B CN101609127 B CN 101609127B
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- 238000001514 detection method Methods 0.000 title abstract description 5
- 239000003381 stabilizer Substances 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000006837 decompression Effects 0.000 claims description 6
- 230000000875 corresponding effect Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 3
- 230000007257 malfunction Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007634 remodeling Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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Abstract
The invention relates to the field of relays, in particular to a relay fault detection circuit, which comprises a power module capable of providing a low-voltage direct-current power supply and a high-voltage alternating-current power supply, a relay module, a control module and a signal feedback module; the control module and the relay module are respectively provided with a low-voltage direct-current power supply by the power supply module, the control module is connected with the control end of the relay module, and the on-off of the switch end of the relay module is controlled by a driving control signal of the control module; one end of the switch end of the relay module is connected with the high-voltage alternating-current power supply output end of the power supply module, the other end of the switch end of the relay module is a load connecting end, the load connecting end is connected with the control module through the signal feedback circuit, and the control module carries out fault detection and control on the relay module through comparing the driving control signal and the feedback signal. The invention can judge the fault that the relay can not be switched on or switched off, can also detect the faults of a plurality of relays simultaneously, and has simple circuit design and convenient use.
Description
Technical field
The present invention relates to the relay field, be specifically related to a kind of relay fault detecting circuit.
Background technology
In the operating circuit of load; Control relay circuit is a topworks; Open or turn-off relay according to the control signal that receives, thereby reach the purpose of control load operation, like the heated condition of control heater, rotary state of control fan electromotor or the like.In use, two kinds of faults generally can appear in relay: the one, and but relay receives and opens signal can't carry out that relay contact can't adhesive, keeps off state always; The 2nd, but relay receives cut-off signals but can't carry out, and the relay contact adhesion can't be broken off, and keeps opening state always.For first kind of fault, its consequence is that load can not be started working, and can't normally use, but can not bring danger; Second kind of fault then can cause load to continue to carry out not controlled work, continues that heating does not stop etc. like well heater, tends to cause major accident or even catastrophic incident to take place.
In the load circuit that uses relay, all there are not the circuit of design special or the malfunction that module detects relay at present, therefore in actual use, the potential safety hazard that controller can't effectively be discerned the state of relay and avoid causing because of the relay fault.And the manufacturer is for the general method of relay and power supply, pilot lamp being connected, detected pilot lamp light on and off state under the state that relay is opened successively that adopts of Performance Detection of relay; This testing circuit can only detect relay and whether be in opening state and make circuit turn-on; Can not detect relay and whether can normally open, turn-off between the two states and change, and this testing circuit be suitable on the specific product relay is carried out real-time fault detect.
Summary of the invention
The object of the present invention is to provide a kind of failure detector circuit of relay; Both can be used for the performance test before relay uses; Also can be used for using on the product of relay; Relay is carried out real-time fault detect, and can also carry out the relay fault detecting circuit of fault detect simultaneously to a plurality of relays.
In order to realize above-mentioned technical purpose; The present invention includes following technical characterictic: a kind of relay fault detecting circuit; Comprise power module, relay module that low-voltage dc power supply and high-voltage ac power can be provided, it is characterized in that also comprising control module and signal feedback module; Control module, relay module provide low-voltage dc power supply by power module respectively, and control module is connected with the control end of relay module, and through the drive control signal of control module the break-make of relay module switch terminals are controlled; The High Level AC Voltage source output terminal of relay module switch terminals one termination power module; The other end is the load link; Said load link is connected with control module through signal feedback circuit, and control module is through relatively drive control signal and feedback signal are carried out fault detect and control to relay module.The present invention carries out signal feedback through the end that the switch terminals to relay module connects load; And with the feedback signal and drive signal compare; Thereby judge the failure condition of relay; Therefore the present invention has the function that the relay real time fail detects, but also can realize the fault detection capability of a plurality of relays through a plurality of signal feedback inputs.
Further, said control module comprises control part and comparison portion; The control part output terminal connects relay module; Comparison portion input end connects the output terminal of signal feedback module and control part; The output terminal of comparison portion connects the input end of control part.
With further; Said signal feedback module comprises pressure regulator T51, rectification circuit, bleeder resistance R51 and filtering circuit; Rectification circuit and bleeder resistance R51 are connected between two output terminals of pressure regulator T51 successively, and filtering circuit is connected in parallel on bleeder resistance R51 two ends.Be in series with dividing potential drop in the signal feedback module between rectification circuit and the bleeder resistance R51 with resistance or resistance combination.Rectification circuit in the signal feedback module is commutation diode or full bridge rectifier.When circuit is connected with load and is duty; Signal feedback circuit carries out the high-voltage alternating electric signal to feed back to control module after the low pressure arrangement is handled; Because the voltage range of control module after to step-down has requirement; Signal feedback module among the present invention has been passed through the utilization of pressure regulator T51 and divider resistance or divider resistance combination, and the magnitude of voltage that guarantees output is in the input voltage range of control module.
Further; Said power module comprises high-voltage ac power end, decompression rectifier filter circuit 11, the first voltage stabilizer IC11, capacitor C 14, the second voltage stabilizer IC12, capacitor C 15, capacitor C 16; The high-voltage ac power end with connect the first voltage stabilizer IC11 and the second voltage stabilizer IC12 successively, the output terminal shunt capacitance C14 of the first voltage stabilizer IC11 after decompression rectifier filter circuit 11 is connected; The output terminal of the second voltage stabilizer IC12 is parallel with capacitor C 15 and capacitor C 16.
Further; Said relay module comprises relay K 31 and driving circuit, and driving circuit comprises triode Q31, is connected resistance R 31 between the base stage of said triode Q31 and the collector; Resistance in series R32 between base stage and the control module, emitter connects relay K 31.
The present invention compared with prior art; An end that connects load through the switch terminals to relay module carries out signal feedback; And with the feedback signal and drive signal compare; Whether operate thereby can judge relay, realize whether out of order judgement of relay according to the control of drive signal.Because feedback signal of the present invention is fed back in real time; Therefore the present invention can implement fault detect to relay; It simultaneously both can be the inspection before the work; Also can be when being connected in the load, in the time need detecting, only a plurality of feedback modules need be set signal feedback is got final product to control module the fault of a plurality of relays.Circuit design of the present invention is simple, and is easy to use.
Description of drawings
Fig. 1 is the module principle figure of the embodiment of the invention;
Fig. 2 is the circuit diagram of the embodiment of the invention;
Fig. 3 is the circuit diagram of a kind of embodiment that retrofits of signal feedback module;
Fig. 4 is the circuit diagram of the another kind of remodeling of signal feedback module embodiment.
Embodiment
As shown in Figure 1, the failure detector circuit of present embodiment relay comprises: power module 1, control module 2, relay module 3, load blocks 4 and signal feedback module 5, and wherein load blocks 4 is connected in parallel with signal feedback module 5; Power module 1 is responsible for to control module 2, relay module 3 low-voltage dc power supply being provided, and is responsible for to load blocks 4, signal feedback module 5 high-voltage ac power being provided, and controls the switching of these AC powers by relay module 3; Control module 2 comprises control part 21 and comparison portion 22, and control part 21 output terminals connect relay module 3; Comparison portion 22 input ends connect the output terminal of signal feedback module 5 and control part 21; The output terminal of comparison portion 22 connects the input end of control part 21.Control part 21 is responsible for to relay module 3 and comparison portion 22 output drive control signal; Comparison portion 22 is responsible for the drive control signal that control part 21 is exported and the feedback signal that receives from signal feedback module 5 compares, and comparative result is fed back to control part 21; Load blocks 4 is responsible for accomplishing the execution of drive control signal final purpose; Signal feedback module 5 is responsible for gathering drive control signal by the signal of relay module 3 implementation status and to control module 2 feedbacks.
As shown in Figure 2; In the failure detector circuit of present embodiment relay; Power module 1 is made up of 220V high-voltage ac power, decompression rectifier filter circuit 11, the first voltage stabilizer IC11, capacitor C 14, the second voltage stabilizer IC12, capacitor C 15, capacitor C 16; First voltage stabilizer IC11 output 12V low-voltage DC, second voltage stabilizer IC12 output 5V low-voltage DC.The high-voltage ac power end with connect the first voltage stabilizer IC11 and the second voltage stabilizer IC12 successively, the output terminal shunt capacitance C14 of the first voltage stabilizer IC11 after decompression rectifier filter circuit 11 is connected; The output terminal of the second voltage stabilizer IC12 is parallel with capacitor C 15 and capacitor C 16.
Relay module 3 is made up of relay K 31, diode D31 and driving circuit, is connected resistance R 31 between triode Q31 base stage and the collector in the driving circuit, resistance in series R32 between base stage and the control module 2, and emitter connects relay K 31.
Relay K 31 provides working power by the 12V low-voltage DC of first voltage stabilizer IC11 output, and diode D31 protective relay K31 avoids breakdown.
Load blocks 4 drives the well heater W41 that carries out work for receiving relay; Signal feedback module 5 is connected in parallel on load blocks 4 two ends; Be connected in the 220V High Level AC Voltage power supply switching of opening, turn-offing direct control load module 4 and signal feedback module 5 of relay K 31 with relay K 31.
Under the normal state of relay; Back controller 21 output high level drive control signal power on; Driving circuit makes relay K 31 open-minded; Signal feedback module 5 is connected high-voltage ac powers, and high-voltage ac power converts the 3V direct current into through pressure regulator T51, diode D51, then after filtering to the feedback signal of control part 21 output 3V direct currents (high level); Controller 21 output low level drive control signal, driving circuit are turn-offed relay K 31, and the power end of signal feedback module 5 can not be connected high-voltage ac power, and signal feedback module 5 is to the feedback signal of comparison portion 22 output low levels.
Under the malfunction that the contact occurring at relay can't adhesive, can not open; Even controller 21 output high level signals; Relay K 31 also is in off state, and the power end of signal feedback module 5 can not be connected high-voltage ac power, and signal feedback module 5 is to comparison portion 22 output low levels.
Under malfunction that the contact adhesion can't break off, can not turn-off appears in relay; Even controller 21 output low level signals; Relay K 31 also is in opening state, and signal feedback module 5 is connected high-voltage ac power, to comparison portion 22 output 3V direct currents (high level).
Therefore; The comparison portion 22 of control module compares the drive control signal of control part 21 outputs and the feedback signal of reception; If two signals logically are consistent, explain that relay carried out corresponding action according to drive control signal, judge that relay is in proper working order; If two signals logically are not consistent, relay is described not according to drive control signal execution corresponding action, operation irregularity judges that relay breaks down, control part 21 can carry out fault alarm according to this judged result.According to actual needs, can in circuit, connect a plurality of relays to be detected and corresponding signal feedback module.
The foregoing description testing circuit is applicable to the malfunction that detects relay on the specific product in real time, if just detect the performance condition of relay, can not want load blocks 4 in the testing circuit, and this does not influence the accuracy of feedback signal and fault judgement.
According to the foregoing description content, if the output voltage of the pressure regulator T51 that selects is not suitable for control module, can make following remodeling: resistance in series is carried out dividing potential drop between commutation diode D51 and bleeder resistance R51, makes the signal of output be suitable for control module 2.Show that like Fig. 3 the output voltage of pressure regulator T51 is 12V, pressure regulator T51 connects with resistance R52, bleeder resistance R51 with diode D51, dividing potential drop, and the resistance of resistance R 51 is 1k Ω, and the resistance of resistance R 52 is 3k Ω, and the output signal is 3V, is suitable for control module 2.Or show like Fig. 4; The output voltage of pressure regulator T51 is 12V; Pressure regulator T51 connects with diode D51, resistance R 53, resistance R 54, and parallelly connected with resistance R 54 behind the bleeder resistance R51 resistance in series R52, the resistance of resistance R 51, R52, R53, R54 is 1k Ω; The output signal is 3V, is suitable for control module 2.
According to the foregoing description content, replace the commutation diode D51 in the signal feedback module 5 also should belong to protection scope of the present invention with full bridge rectifier.
Claims (6)
1. a relay fault detecting circuit comprises power module (1), relay module (3) that low-voltage dc power supply and high-voltage ac power can be provided, it is characterized in that also comprising control module (2) and signal feedback module (5);
Control module (2), relay module (3) provide low-voltage dc power supply by power module (1) respectively; Control module (2) is connected with the control end of relay module (3), and through the drive control signal of control module (2) break-make of relay module (3) switch terminals is controlled;
The High Level AC Voltage source output terminal of relay module (3) switch terminals one termination power module (1); The other end is load (a 4) link; Said load link is connected with control module (2) through signal feedback module (5), and control module (2) is through relatively drive control signal and feedback signal are carried out fault detect and control to relay module (3);
Control module (2) comprises control part (21) and comparison portion (22); Control part (21) output terminal connects relay module (3); Comparison portion (22) input end connects the output terminal of signal feedback module (5) and control part (21); The output terminal of comparison portion (22) connects the input end of control part (21);
The comparison portion (22) of control module compares the drive control signal of control part (21) output and the feedback signal of reception; If two signals logically are consistent; Explain that relay carried out corresponding action according to drive control signal, judge that relay is in proper working order; If two signals logically are not consistent, relay is described not according to drive control signal execution corresponding action, operation irregularity judges that relay breaks down, control part (21) can carry out fault alarm according to this judged result.
2. relay fault detecting circuit according to claim 1; It is characterized in that said signal feedback module (5) comprises pressure regulator T51, rectification circuit, bleeder resistance R51 and filtering circuit; Rectification circuit and bleeder resistance R51 are connected between two output terminals of pressure regulator T51 successively, and filtering circuit is connected in parallel on bleeder resistance R51 two ends.
3. relay fault detecting circuit according to claim 2 is characterized in that being in series with between middle rectification circuit of signal feedback module (5) and the bleeder resistance R51 dividing potential drop with resistance or resistance combination.
4. according to claim 2 or 3 each described relay fault detecting circuits, it is characterized in that the rectification circuit in the signal feedback module (5) is commutation diode or full bridge rectifier.
5. relay fault detecting circuit according to claim 1; It is characterized in that said power module (1) comprises high-voltage ac power end, decompression rectifier filter circuit 11, the first voltage stabilizer IC11, capacitor C 14, the second voltage stabilizer IC12, capacitor C 15, capacitor C 16; The high-voltage ac power end with connect the first voltage stabilizer IC11 and the second voltage stabilizer IC12 successively, the output terminal shunt capacitance C14 of the first voltage stabilizer IC11 after decompression rectifier filter circuit 11 is connected; The output terminal of the second voltage stabilizer IC12 is parallel with capacitor C 15 and capacitor C 16.
6. relay fault detecting circuit according to claim 1; It is characterized in that said relay module (3) comprises relay K 31 and driving circuit; Driving circuit comprises triode Q31; Be connected resistance R 31 between the base stage of said triode Q31 and the collector, resistance in series R32 between base stage and the control module (2), emitter connects relay K 31.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910041360 CN101609127B (en) | 2009-07-24 | 2009-07-24 | Relay fault detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910041360 CN101609127B (en) | 2009-07-24 | 2009-07-24 | Relay fault detection circuit |
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| CN101609127B true CN101609127B (en) | 2012-12-05 |
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