CN204789923U - Failure detector circuit - Google Patents
Failure detector circuit Download PDFInfo
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- CN204789923U CN204789923U CN201520341596.1U CN201520341596U CN204789923U CN 204789923 U CN204789923 U CN 204789923U CN 201520341596 U CN201520341596 U CN 201520341596U CN 204789923 U CN204789923 U CN 204789923U
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- optocoupler
- isolation
- diode
- chip
- power supply
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Abstract
The utility model discloses a failure detector circuit, including automatically controlled unit, isolation power and isolation opto -coupler, it is connected through switch and isolation opto -coupler to keep apart the output of power, the signal output part that keeps apart the opto -coupler with automatically controlled unit connection, the output linked switch's of the same kind of automatically controlled unit control end, automatically controlled unit is through detecting the output signal who keeps apart the opto -coupler determines whether the switch breaks down. The utility model discloses can accurately detect defective switch.
Description
Technical field
The utility model electric field, particularly a kind of failure detector circuit.
Background technology
Currently use high-voltage relay and high-voltage insurance in large quantities in high-pressure system application, the main failure mode of high-voltage relay has adhesion and cannot close two kinds of fault modes.See Fig. 3, it is a kind of detection method of the inefficacy of prior art repeat circuit, it adopts the mode of auxiliary contact to judge, its principle of work is: connected by MI and MO when the main contacts S1 of high-voltage relay closes, and drives auxiliary contact S2 to close simultaneously and is connected by AI and AO; AI connects an electric signal under normal circumstances, judges whether MI and MO is communicated with by the electric signal detected on AO.But the method exists following shortcoming: be communicated with when S1 performs MI and MO reality after closed action, but S2 fails to close due to fault, and therefore AI and AO is not communicated with, and causes misinterpretation MI and MO not to be communicated with; When S1 switch adhesion, the connection of MI and MO can not be disconnected, but S2 switch disconnects, namely AI and AO connection disconnects, causes misinterpretation MI and MO to disconnect.As can be seen here, can accurately not detect the fault of relay in prior art.Prior art there is no and automatically detects termination of insurance status method, only has and judges termination of insurance status by the break-make at manual operation measurement insurance two ends.
Summary of the invention
For the defect of prior art, the utility model provides a kind of relay fault detecting circuit.
A kind of failure detector circuit, comprise ECU (Electrical Control Unit), insulating power supply and isolation optocoupler, the output of described insulating power supply is connected with isolation optocoupler through switch, the signal output part of described isolation optocoupler is connected with described ECU (Electrical Control Unit), one tunnel of described ECU (Electrical Control Unit) exports the control end of connecting valve, by the output signal detecting described isolation optocoupler, described ECU (Electrical Control Unit) judges whether described switch breaks down.
Optionally, described switch is relay.
Optionally, described insulating power supply comprises voltage stabilizing chip U1 and isolation voltage chip U2, and described voltage stabilizing chip U1 and isolation voltage chip U2 is in series, the input end of voltage stabilizing chip U1 is connected to filter capacitor C5 and stabilivolt DP1, and power input PWR is connected with the public connecting end of filter capacitor C5 and stabilivolt DP1 by diode D2, the output of voltage stabilizing chip U1 is through electric capacity C4, E2, E1, be connected with isolation voltage chip U2 after the filtering circuit that C3 and inductance L 2 form, common port wherein after C4 and E2 parallel connection is connected with one end of L2, the other end of L2 and E1, common port after C3 parallel connection connects, the output terminal of isolation voltage chip U2 is through inductance L 1 and electric capacity C1, common port after C2 parallel connection connects, C1, common port after C2 parallel connection is also connected with one end of diode D1, diode D3 and electric capacity C1, C2 is in parallel, the other end of diode D1 is connected with one end of relay K 1 by resistance R1, the other end of relay K 1 connects the input end of optocoupler OP1, the OP1 of optocoupler exports corresponding electric signal, the output terminal of optocoupler OP1 is connected with the base stage of triode T1, the emitter of triode is by resistance R7 ground connection, collector is connected with power input PWR and signal output part RL_ST respectively through diode D5.
Optionally, described insulating power supply is controlled insulating power supply, and ECU (Electrical Control Unit) is connected with the controlled end of insulating power supply, controls insulating power supply work by ECU (Electrical Control Unit) output enable signal.
Optionally, described switch is fuse.
Optionally, described insulating power supply comprises voltage stabilizing chip U1 and isolation voltage chip U2, and described voltage stabilizing chip U1 and isolation voltage chip U2 is in series.The input end of voltage stabilizing chip U1 is connected to filter capacitor C5 and stabilivolt DP1, and power input PWR is connected with the public connecting end of filter capacitor C5 and stabilivolt DP1 by diode D2.The output of voltage stabilizing chip U1 is through electric capacity C4, E2, E1, be connected with isolation voltage chip U2 after the filtering circuit that C3 and inductance L 2 form, common port wherein after C4 and E2 parallel connection is connected with one end of L2, the other end of L2 and E1, common port after C3 parallel connection connects, the output terminal of isolation voltage chip U2 is through inductance L 1 and electric capacity C1, common port after C2 parallel connection connects, C1, common port after C2 parallel connection is also connected with one end of diode D1, diode D3 and electric capacity C1, C2 is in parallel, the other end of diode D1 is connected with one end of fuse by resistance R1, the other end of fuse connects the input end of optocoupler OP1, the OP1 of optocoupler exports corresponding electric signal, the output terminal of optocoupler OP1 is connected with the base stage of triode T1, the emitter of triode is by resistance R7 ground connection, collector is connected with power input PWR and signal output part RL_ST respectively through diode D5.
The beneficial effects of the utility model are: can be judged switch contact adhesion accurately by isolation optocoupler and ECU, the fault such as cannot to be closed, also can judge fuse fault, detection accuracy is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model first embodiment failure detector circuit;
Fig. 2 is the circuit diagram of the utility model second embodiment failure detector circuit;
Fig. 3 is the schematic diagram of failure detector circuit in prior art.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing, make above-mentioned and other object of the present utility model, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing in proportion, focus on purport of the present utility model is shown.
Embodiment 1
As shown in Figure 1, testing circuit mainly comprises ECU (Electrical Control Unit) (ECU), insulating power supply and isolation optocoupler, the output of ECU (Electrical Control Unit) is connected with isolated tube optocoupler through relay, the work of insulating power supply and relay is controlled by ECU, ECU receives the detection signal of isolation optocoupler, judges whether relay breaks down according to this detection signal.
Described insulating power supply comprises voltage stabilizing chip U1 and isolation voltage chip U2, and described voltage stabilizing chip U1 and isolation voltage chip U2 is in series.The input end of voltage stabilizing chip U1 is connected to filter capacitor C5 and stabilivolt DP1, and power input PWR is connected with the public connecting end of filter capacitor C5 and stabilivolt DP1 by diode D2.The output of voltage stabilizing chip U1 is through electric capacity C4, E2, E1, be connected with isolation voltage chip U2 after the filtering circuit that C3 and inductance L 2 form, common port wherein after C4 and E2 parallel connection is connected with one end of L2, the other end of L2 and E1, common port after C3 parallel connection connects, the output terminal of isolation voltage chip U2 is through inductance L 1 and electric capacity C1, common port after C2 parallel connection connects, C1, common port after C2 parallel connection is also connected with one end of diode D1, diode D3 and electric capacity C1, C2 is in parallel, the other end of diode D1 is connected with one end of relay K 1 by resistance R1, the other end of relay K 1 connects the input end of optocoupler OP1, the OP1 of optocoupler exports corresponding electric signal, the output terminal of optocoupler OP1 is connected with the base stage of triode T1, the emitter of triode is by resistance R7 ground connection, collector is connected with power input PWR and signal output part RL_ST respectively through diode D5.
After circuit powers on, insulating power supply exports an isolation voltage, by the electric signal detected on RL_ST, ECU determines whether relay K 1 closes.The first situation: when ECU control K1 closes, as K1 reality is closed, optocoupler OP1 conducting, RL_ST exports corresponding low level electric signal, judges that relay closes is normal when ECU detects this signal; Otherwise when ECU control K1 closes, and K1 reality is not closed, then optocoupler OP1 not conducting, and RL_ST is without corresponding low level electric signal, and ECU detects without corresponding electric signal, judge that relay closes is abnormal.The second feelings: when ECU control K1 is closed or control K1 disconnects, and K1 is in fact closed, optocoupler OP1 conducting, and FB exports corresponding low level electric signal, judges relay adhesion when ECU detects this signal.
Further, insulating power supply can adopt controlled insulating power supply, No. 3 pin of ECU can be connected with the controlled end of insulating power supply, insulating power supply work is controlled by ECU output enable signal, one of benefit done like this is that PWR is when adopting normal electricity, controller can cut out this circuit, thus reduces circuit power consumption; Simultaneously when this circuit multiple coexists, related circuit can be opened according to the order of sequence as required, thus reduce the surge load of power supply.
Whether this patent control circuit is powered by PWR and GND, connect for detecting two high-voltage contacts.When applying this patent, detected two high-voltage contacts are connected with testing circuit HV_Side1 with HV_Side2 of this patent respectively, by the level state detecting RL_ST, ECU determines whether two high-voltage contacts connect.
The control circuit of this patent is powered by PWR and GND, and power supply carries out voltage stabilizing by U1, by the input service voltage of voltage stabilization at insulating power supply U2; U2 export with PWR and GND isolated isolation voltage SENSOR_VCC and SENSOR_GND(hereinafter referred to as: V every).When detected contact HV_Side1 and HV_Side2 is connected, voltage V, every the Pin1 pin of logical D1 and R4 to isolation optocoupler OP1, uses Pin3 and the Pin4 conducting of OP1, triode T1 conducting simultaneously, RL_ST state transfer is low level, and ECU judges that HV_Side1 with HV_Side2 is connected; When detected contact HV_Side1 and HV_Side2 is not communicated with, now isolate the non-conducting of optocoupler OP1, therefore triode T1 is also in not on-state, and now the voltage of RL_ST is PWR voltage, corresponding level is high level, and ECU judges that HV_Side1 with HV_Side2 is not connected.
In the utility model, insulating power supply effect is the isolated power supply of output one tunnel and low-tension supply, and when the effect of isolation optocoupler is the input side conducting when isolation optocoupler, export 1 feedback signal, ECU judges the state of relay switch by detecting this signal condition.Isolation optocoupler input side loop through relay, when the switch of relay is in closure state, so optocoupler input side loop conducting, it is closed that optocoupler exports an electric signal indicating relay switch; When the switch of relay is in off-state, so optocoupler input side loop not conducting, optocoupler has disconnected without corresponding electric signal output indicating relay switch or has insured and has been in off-state.The mode of the electric signal that the utility model adopts high and low pressure to isolate realizes the judgement to losing efficacy, and reliability is higher than mechanical system.Measure loop and high tension loop adopt the same circuit, therefore there is not erroneous judgement of losing efficacy.Isolation voltage depends on insulating power supply U1, and isolation voltage can reach thousands of volt.
Embodiment 2
The present embodiment introduces difference from Example 1, and something in common repeats no more.Different from embodiment 1, in this embodiment switch be insured silk substitute, as shown in Figure 2.Embodiment 2 can be applicable to high-voltage insurance failure detection.After the activation signal active circuit of ECU, insulating power supply exports an isolation voltage, and ECU determines the whether disconnection insured by the electric signal on signal lines RL_ST.When insuring F1 and not disconnecting, optocoupler OP1 conducting, RL_ST exports corresponding low level electric signal, judges that insurance does not disconnect when ECU detects this signal; When insuring disconnection, optocoupler OP1 not conducting, FB is without corresponding low level electric signal, and ECU detects that RL_ST is without corresponding electric signal, judges that insurance disconnects.
Set forth a lot of detail in the above description so that fully understand the utility model.But above description is only preferred embodiment of the present utility model, the utility model can be much different from alternate manner described here to implement, and therefore the utility model is not by the disclosed concrete restriction implemented above.Any those skilled in the art are not departing under technical solutions of the utility model ambit simultaneously, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solutions of the utility model, or be revised as the Equivalent embodiments of equivalent variations.Every content not departing from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solutions of the utility model protection.
Claims (6)
1. a failure detector circuit, it is characterized in that, comprise ECU (Electrical Control Unit), insulating power supply and isolation optocoupler, the output of described insulating power supply is connected with isolation optocoupler through switch, the signal output part of described isolation optocoupler is connected with described ECU (Electrical Control Unit), one tunnel of described ECU (Electrical Control Unit) exports the control end of connecting valve, by the output signal detecting described isolation optocoupler, described ECU (Electrical Control Unit) judges whether described switch breaks down.
2. failure detector circuit according to claim 1, is characterized in that, described switch is relay.
3. failure detector circuit according to claim 2, is characterized in that, described insulating power supply comprises voltage stabilizing chip U1 and isolation voltage chip U2, and described voltage stabilizing chip U1 and isolation voltage chip U2 is in series, the input end of voltage stabilizing chip U1 is connected to filter capacitor C5 and stabilivolt DP1, and power input PWR is connected with the public connecting end of filter capacitor C5 and stabilivolt DP1 by diode D2, the output of voltage stabilizing chip U1 is through electric capacity C4, E2, E1, be connected with isolation voltage chip U2 after the filtering circuit that C3 and inductance L 2 form, common port wherein after C4 and E2 parallel connection is connected with one end of L2, the other end of L2 and E1, common port after C3 parallel connection connects, the output terminal of isolation voltage chip U2 is through inductance L 1 and electric capacity C1, common port after C2 parallel connection connects, C1, common port after C2 parallel connection is also connected with one end of diode D1, diode D3 and electric capacity C1, C2 is in parallel, the other end of diode D1 is connected with one end of relay K 1 by resistance R1, the other end of relay K 1 connects the input end of optocoupler OP1, the OP1 of optocoupler exports corresponding electric signal, the output terminal of optocoupler OP1 is connected with the base stage of triode T1, the emitter of triode is by resistance R7 ground connection, collector is connected with power input PWR and signal output part RL_ST respectively through diode D5.
4. failure detector circuit according to claim 1, is characterized in that, described insulating power supply is controlled insulating power supply, and ECU (Electrical Control Unit) is connected with the controlled end of insulating power supply, controls insulating power supply work by ECU (Electrical Control Unit) output enable signal.
5. failure detector circuit according to claim 1, is characterized in that, described switch is fuse.
6. failure detector circuit according to claim 5, is characterized in that, described insulating power supply comprises voltage stabilizing chip U1 and isolation voltage chip U2, and described voltage stabilizing chip U1 and isolation voltage chip U2 is in series.The input end of voltage stabilizing chip U1 is connected to filter capacitor C5 and stabilivolt DP1, and power input PWR is connected with the public connecting end of filter capacitor C5 and stabilivolt DP1 by diode D2.The output of voltage stabilizing chip U1 is through electric capacity C4, E2, E1, be connected with isolation voltage chip U2 after the filtering circuit that C3 and inductance L 2 form, common port wherein after C4 and E2 parallel connection is connected with one end of L2, the other end of L2 and E1, common port after C3 parallel connection connects, the output terminal of isolation voltage chip U2 is through inductance L 1 and electric capacity C1, common port after C2 parallel connection connects, C1, common port after C2 parallel connection is also connected with one end of diode D1, diode D3 and electric capacity C1, C2 is in parallel, the other end of diode D1 is connected with one end of fuse by resistance R1, the other end of fuse connects the input end of optocoupler OP1, the OP1 of optocoupler exports corresponding electric signal, the output terminal of optocoupler OP1 is connected with the base stage of triode T1, the emitter of triode is by resistance R7 ground connection, collector is connected with power input PWR and signal output part RL_ST respectively through diode D5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341596.1U CN204789923U (en) | 2015-05-26 | 2015-05-26 | Failure detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520341596.1U CN204789923U (en) | 2015-05-26 | 2015-05-26 | Failure detector circuit |
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| Publication Number | Publication Date |
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| CN204789923U true CN204789923U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520341596.1U Withdrawn - After Issue CN204789923U (en) | 2015-05-26 | 2015-05-26 | Failure detector circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914377A (en) * | 2015-05-26 | 2015-09-16 | 吴小燕 | Fault detection circuit |
| CN108288846A (en) * | 2017-01-09 | 2018-07-17 | 展鹏科技股份有限公司 | A kind of optocoupler input protection circuit and its guard method |
| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN110769552A (en) * | 2019-10-31 | 2020-02-07 | 深圳市崧盛电子股份有限公司 | Output short circuit back quick recovery circuit and LED drive power supply |
| CN110901449A (en) * | 2019-11-06 | 2020-03-24 | 东风汽车有限公司 | Alternating-current charging stake relay detects and controlling means and alternating-current charging stake |
-
2015
- 2015-05-26 CN CN201520341596.1U patent/CN204789923U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914377A (en) * | 2015-05-26 | 2015-09-16 | 吴小燕 | Fault detection circuit |
| CN104914377B (en) * | 2015-05-26 | 2018-01-16 | 吴小燕 | A kind of failure detector circuit |
| CN108288846A (en) * | 2017-01-09 | 2018-07-17 | 展鹏科技股份有限公司 | A kind of optocoupler input protection circuit and its guard method |
| CN108288846B (en) * | 2017-01-09 | 2020-07-03 | 展鹏科技股份有限公司 | Optical coupler input protection circuit and protection method thereof |
| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN109254245B (en) * | 2018-11-07 | 2020-12-01 | 紫光测控有限公司 | Relay loop short circuit and open circuit detection circuit |
| CN110769552A (en) * | 2019-10-31 | 2020-02-07 | 深圳市崧盛电子股份有限公司 | Output short circuit back quick recovery circuit and LED drive power supply |
| CN110769552B (en) * | 2019-10-31 | 2021-05-18 | 深圳市崧盛电子股份有限公司 | Output short circuit back quick recovery circuit and LED drive power supply |
| CN110901449A (en) * | 2019-11-06 | 2020-03-24 | 东风汽车有限公司 | Alternating-current charging stake relay detects and controlling means and alternating-current charging stake |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151118 Effective date of abandoning: 20180116 |