CN104914377B - A kind of failure detector circuit - Google Patents
A kind of failure detector circuit Download PDFInfo
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- CN104914377B CN104914377B CN201510270012.0A CN201510270012A CN104914377B CN 104914377 B CN104914377 B CN 104914377B CN 201510270012 A CN201510270012 A CN 201510270012A CN 104914377 B CN104914377 B CN 104914377B
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- ecu
- optocoupler
- isolation
- signal
- voltage
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Abstract
The invention discloses a kind of failure detector circuit, including ECU, insulating power supply and isolation optocoupler, the output of the insulating power supply is connected by switch with isolation optocoupler, the signal output part of the isolation optocoupler is connected with the ECU, the control terminal for exporting connecting valve all the way of the ECU, the ECU judge whether the switch breaks down by detecting the output signal of the isolation optocoupler.The accurate detection switch failure of energy of the invention.
Description
Technical field
Electric field of the present invention, more particularly to a kind of failure detector circuit.
Background technology
Currently high-voltage relay and high-voltage insurance are used in large quantities in high-pressure system application field, high-voltage relay is main
Failure mode have adhesion and two kinds of fault modes can not be closed.Referring to Fig. 3, it is the one of the failure of prior art repeat circuit
Kind detection method, it is judged by the way of auxiliary contact, and its operation principle is：The main contacts S1 of high-voltage relay is closed
MI is connected with MO during conjunction, while drives auxiliary contact S2 closures to be connected AI with AO；AI connects an electric signal under normal circumstances, leads to
Cross and detect the electric signal on AO to judge whether MI connects with MO.But the method has the following disadvantages：When S1 performs closed action
MI and MO have actually been connected afterwards, but S2 fails to close due to failure, therefore AI is not connected with AO, causes misinterpretation MI and MO not connect
It is logical；When S1 switchs adhesion, it is impossible to MI and MO connection is disconnected, but S2 switches have disconnected, i.e., and AI is connected with AO and disconnected, and makes
Disconnected into misinterpretation MI and MO.As can be seen here, the failure of relay can not accurately be detected in the prior art.It is existing
Technology there is no automatic detection termination of insurance status method, and the break-make that insurance both ends are only measured by manual operation is lost to judge to insure
Effect.
The content of the invention
The defects of for prior art, the invention provides a kind of relay fault detecting circuit.
A kind of failure detector circuit, including ECU, insulating power supply and isolation optocoupler, the output warp of the insulating power supply
Cross switch to be connected with isolation optocoupler, the signal output part of the isolation optocoupler is connected with the ECU, the ECU
All the way export connecting valve control terminal, the ECU is by detecting the output signal of the isolation optocoupler to judge
State whether switch breaks down.
Optionally, the switch is relay.
Optionally, the insulating power supply include voltage stabilizing chip U1 and isolation voltage chip U2, the voltage stabilizing chip U1 with every
Ionization voltage chip U2 is in series；Voltage stabilizing chip U1 input is terminated with filter capacitor C5 and voltage-stabiliser tube DP1, power input PWR
It is connected by diode D2 with filter capacitor C5 and voltage-stabiliser tube DP1 public connecting end；Voltage stabilizing chip U1 output through electric capacity C4,
It is connected after the filter circuit of E2, E1, C3 and inductance L2 compositions with isolation voltage chip U2, the common port after wherein C4 is in parallel with E2
It is connected with L2 one end, the L2 other end is connected with the common port after E1, C3 parallel connection, isolation voltage chip U2 output end warp
Cross inductance L1 to be connected with the common port after electric capacity C1, C2 parallel connection, the common port after C1, C2 parallel connection also connects with diode D1 one end
Connecing, diode D3 is in parallel with electric capacity C1, C2, and the diode D1 other end is connected by resistance R1 with relay K1 one end,
Relay K1 other end connection optocoupler OP1 input, the OP1 of optocoupler export corresponding electric signal, optocoupler OP1 output end
Be connected with triode T1 base stage, the emitter stage of triode is grounded by resistance R7, colelctor electrode by diode D5 respectively with electricity
Source input PWR connects with signal output part RL_ST.
Optionally, the insulating power supply is controlled insulating power supply, the controlled end connection of ECU and insulating power supply, is passed through
ECU output enable signal control insulating power supply work.
Optionally, the ECU judges whether the switch goes out by detecting the output signal of the isolation optocoupler
Existing failure, is specifically included：ECU determines whether relay K1 closes by detecting the electric signal on RL_ST, the first situation：
When ECU control K1 closures, as K1 has actually been closed, optocoupler OP1 conductings, RL_ST exports corresponding low level electric signal, ECU
Judge that relay closure is normal when detecting this signal；Conversely, when ECU control K1 closures, and K1 is actually not closed, then optocoupler
OP1 is not turned on, and without corresponding low level electric signal, ECU detects without corresponding electric signal RL_ST, judges relay closure not
Normally；Second of feelings：When ECU does not control K1 to close or control K1 disconnects, and K1 has actually been closed, optocoupler OP1 conductings, FB
Corresponding low level electric signal is exported, ECU judges relay adhesion when detecting this signal.
A kind of failure detector circuit, including ECU, insulating power supply and isolation optocoupler, the output warp of the insulating power supply
Cross fuse to be connected with isolation optocoupler, the signal output part of the isolation optocoupler is connected with the ECU, the automatically controlled list
The connection fuse of output all the way of member, the ECU judge the guarantor by detecting the output signal of the isolation optocoupler
Whether dangerous silk breaks down.
Optionally, the insulating power supply include voltage stabilizing chip U1 and isolation voltage chip U2, the voltage stabilizing chip U1 with every
Ionization voltage chip U2 is in series.Voltage stabilizing chip U1 input is terminated with filter capacitor C5 and voltage-stabiliser tube DP1, power input PWR
It is connected by diode D2 with filter capacitor C5 and voltage-stabiliser tube DP1 public connecting end.Voltage stabilizing chip U1 output through electric capacity C4,
It is connected after the filter circuit of E2, E1, C3 and inductance L2 compositions with isolation voltage chip U2, the common port after wherein C4 is in parallel with E2
It is connected with L2 one end, the L2 other end is connected with the common port after E1, C3 parallel connection, isolation voltage chip U2 output end warp
Cross inductance L1 to be connected with the common port after electric capacity C1, C2 parallel connection, the common port after C1, C2 parallel connection also connects with diode D1 one end
Connect, diode D3 is in parallel with electric capacity C1, C2, and the diode D1 other end is connected by one end of resistance R1 and fuse, is protected
The other end connection optocoupler OP1 of dangerous silk input, the OP1 of optocoupler export corresponding electric signal, optocoupler OP1 output end and three
Pole pipe T1 base stage connection, the emitter stage of triode are grounded by resistance R7, and colelctor electrode is defeated with power supply respectively by diode D5
Enter to hold PWR to be connected with signal output part RL_ST.
Optionally, after ECU activation signal active circuit, insulating power supply exports an isolation voltage, and ECU is believed by detecting
Electric signal on number line RL_ST come determine insurance whether disconnection；When insurance F1 does not disconnect, optocoupler OP1 is turned on, and RL_ST is defeated
Go out corresponding low level electric signal, ECU, which is detected, judges that insurance does not disconnect during this signal；When insuring disconnection, optocoupler OP1 is not led
Logical, for FB without corresponding low level electric signal, ECU detects that RL_ST without corresponding electric signal, judges that insurance has disconnected.
The beneficial effects of the invention are as follows：Switch contact adhesion can accurately be judged by isolation optocoupler and ECU, can not be closed
The failures such as conjunction, fuse failure, detection accuracy height can also be judged.
Brief description of the drawings
Fig. 1 is the circuit diagram of first embodiment of the invention failure detector circuit；
Fig. 2 is the circuit diagram of second embodiment of the invention failure detector circuit；
Fig. 3 is the schematic diagram of failure detector circuit in the prior art.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail, make the above and other purpose of the present invention, feature and advantage will become apparent from.Complete
Identical reference instruction identical part in portion's accompanying drawing.Not deliberately accompanying drawing drawn to scale, it is preferred that emphasis is show this hair
Bright purport.
Embodiment 1
As shown in figure 1, detection circuit mainly includes ECU (ECU), insulating power supply and isolation optocoupler, ECU
Output is connected by relay with isolated tube optocoupler, and the work of insulating power supply and relay is controlled by ECU, and ECU receives isolation
The detection signal of optocoupler, judge whether relay breaks down according to the detection signal.
The insulating power supply includes voltage stabilizing chip U1 and isolation voltage chip U2, the voltage stabilizing chip U1 and isolation voltage core
Piece U2 is in series.Voltage stabilizing chip U1 input is terminated with filter capacitor C5 and voltage-stabiliser tube DP1, and power input PWR passes through two poles
Pipe D2 is connected with filter capacitor C5 and voltage-stabiliser tube DP1 public connecting end.Voltage stabilizing chip U1 output is through electric capacity C4, E2, E1, C3
It is connected with after the filter circuit of inductance L2 compositions with isolation voltage chip U2, one of the common port and L2 after wherein C4 is in parallel with E2
End is connected, and the L2 other end is connected with the common port after E1, C3 parallel connection, and isolation voltage chip U2 output end passes through inductance L1
It is connected with the common port after electric capacity C1, C2 parallel connection, the one end of the common port after C1, C2 parallel connection also with diode D1 is connected, two poles
Pipe D3 is in parallel with electric capacity C1, C2, and the diode D1 other end is connected by resistance R1 with relay K1 one end, relay K1
Other end connection optocoupler OP1 input, the OP1 of optocoupler exports corresponding electric signal, optocoupler OP1 output end and triode
T1 base stage connection, the emitter stage of triode is grounded by resistance R7, colelctor electrode by diode D5 respectively with power input
PWR connects with signal output part RL_ST.
On circuit after electricity, insulating power supply export an isolation voltage, ECU by detect the electric signal on RL_ST determine after
Whether electrical equipment K1 closes.The first situation：When ECU control K1 closures, closed as K1 is actual, optocoupler OP1 conductings, RL_ST
Corresponding low level electric signal is exported, ECU judges that relay closure is normal when detecting this signal；Conversely, when ECU controls K1 is closed
During conjunction, and K1 is actually not closed, then optocoupler OP1 is not turned on, and without corresponding low level electric signal, ECU detects without corresponding RL_ST
Electric signal, judge relay closure it is abnormal.Second of feelings：When ECU does not control K1 to close or control K1 disconnects, and K1 is real
Closed on border, optocoupler OP1 conductings, FB exports corresponding low level electric signal, and ECU has judged relay when detecting this signal
Adhesion.
Further, insulating power supply can use controlled insulating power supply, and ECU No. 3 pin can be controlled with insulating power supply
Connection is held, exporting enable signal by ECU controls insulating power supply to work, when one of benefit so done is that PWR uses often electric, control
Device processed can close this circuit, so as to reduce circuit power consumption；Simultaneously when this multiple circuit coexist, can sequentially it beat as needed
Related circuit is opened, so as to reduce the load of the surge of power supply.
This patent control circuit is powered by PWR and GND, for detecting whether two high-voltage contacts connect.Applying
During this patent, it is detected two high-voltage contacts and is connected respectively with detection the circuit HV_Side1 and HV_Side2 of this patent, ECU leads to
The level state for crossing detection RL_ST 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, and voltage stabilization is existed
Insulating power supply U2 input service voltage；U2 exports isolates isolation voltage SENSOR_VCC and SENSOR_GND with PWR and GND
（Hereinafter referred to as：V every）.When detected contact HV_Side1 is connected with HV_Side2, voltage V is every logical D1 and R4 to isolation optocoupler
OP1 Pin1 pin, are turned on using OP1 Pin3 with Pin4, while triode T1 is turned on, and RL_ST states are changed into low level,
ECU judges that HV_Side1 and HV_Side2 has been connected；When detected contact HV_Side1 is not connected with HV_Side2, this after
Do not turned on from optocoupler OP1, therefore triode T1 is also at not on-state, now RL_ST voltage is PWR voltages, corresponding electricity
Put down and judge that HV_Side1 and HV_Side2 is not connected with for high level, ECU.
Insulating power supply effect is to export the power supply being isolated all the way with low-tension supply in the present invention, and the effect of isolation optocoupler is
When the input side conducting of isolation optocoupler, 1 feedback signal is exported, ECU judges that relay is opened by detecting this signal condition
The state of pass.The input side loop of isolation optocoupler passes through relay, when the switch of relay is in closure state, then optocoupler is defeated
Enter side loop conducting, optocoupler exports an electric signal indicating relay switch and closed；Shape is disconnected when the switch of relay is in
State, then optocoupler input side loop is not turned on, and optocoupler has disconnected or insured without corresponding electric signal output indicating relay switch
It is off.The present invention realizes the judgement to failure by the way of the electric signal of high and low pressure isolation, and reliability is than machinery
Mode is high.Measure loop uses the same circuit with high tension loop, therefore in the absence of failure erroneous judgement.Isolation voltage depends on isolation electricity
Source U1, isolation voltage is up to thousands of volts.
Embodiment 2
The present embodiment introduces difference from Example 1, and something in common repeats no more.It is different from embodiment 1, at this
Switch is substituted by fuse in embodiment, as shown in Figure 2.Embodiment 2 can be applied to high-voltage insurance failure detection.When swashing for ECU
After signal activation circuit living, insulating power supply exports an isolation voltage, and ECU is by the electric signal on signal lines RL_ST come really
Surely insure whether disconnection.When insurance F1 does not disconnect, optocoupler OP1 conductings, RL_ST exports corresponding low level electric signal, ECU
Detect and judge that insurance does not disconnect during this signal；When insuring disconnection, optocoupler OP1 is not turned on, and FB is without corresponding low level telecommunications
Number, ECU detects that RL_ST without corresponding electric signal, judges that insurance has disconnected.
Many details are elaborated in the above description in order to fully understand the present invention.But above description is only
Presently preferred embodiments of the present invention, the invention can be embodied in many other ways as described herein, therefore this
Invention is not limited by specific implementation disclosed above.Any those skilled in the art are not departing from the technology of the present invention simultaneously
In the case of aspects, all technical solution of the present invention is made using the methods and technical content of the disclosure above many possible
Changes and modifications, or it is revised as the equivalent embodiment of equivalent variations.Every content without departing from technical solution of the present invention, according to this
The technical spirit of invention still falls within skill of the present invention to any simple modifications, equivalents, and modifications made for any of the above embodiments
In the range of the protection of art scheme.
Claims (6)
- A kind of 1. failure detector circuit, it is characterised in that including ECU ECU, insulating power supply and isolation optocoupler, the isolation The output of power supply is connected by switch with isolation optocoupler, and the signal output part of the isolation optocoupler connects with the ECU ECU Connect, the control terminal for exporting connecting valve all the way of the ECU ECU, the ECU ECU is by detecting the isolation The output signal of optocoupler come judge it is described switch whether break down, the insulating power supply includes voltage stabilizing chip U1 and isolation voltage Chip U2, the voltage stabilizing chip U1 are in series with isolation voltage chip U2；Voltage stabilizing chip U1 input is terminated with filter capacitor C5 It is connected with voltage-stabiliser tube DP1, power input PWR by diode D2 with filter capacitor C5 and voltage-stabiliser tube DP1 public connecting end； Connect after the filter circuit that voltage stabilizing chip U1 output forms through electric capacity C4, E2, E1, C3 and inductance L2 with isolation voltage chip U2 Connect, wherein C4 is connected with the common port after E2 parallel connections with L2 one end, and the common port after the L2 other end is in parallel with E1, C3 connects Connect, isolation voltage chip U2 output end is connected by inductance L1 with the common port after electric capacity C1, C2 parallel connection, after C1, C2 parallel connection One end also with diode D1 of common port be connected, diode D3 is in parallel with electric capacity C1, C2, and the diode D1 other end passes through Resistance R1 is connected with relay K1 one end, relay K1 other end connection optocoupler OP1 input, the OP1 outputs of optocoupler Corresponding electric signal, optocoupler OP1 output end are connected with triode T1 base stage, and the emitter stage of triode is connect by resistance R7 Ground, colelctor electrode are connected with power input PWR and signal output part RL_ST respectively by diode D5.
- 2. failure detector circuit according to claim 1, it is characterised in that the switch is relay.
- 3. failure detector circuit according to claim 1, it is characterised in that the insulating power supply is controlled insulating power supply, The controlled end of ECU ECU and insulating power supply connects, and exporting enable signal by ECU ECU controls insulating power supply work Make.
- 4. failure detector circuit according to claim 1, it is characterised in that the ECU ECU passes through described in detection The output signal of isolation optocoupler come judge it is described switch whether break down, specifically include：ECU is by detecting the electricity on RL_ST Signal determines whether relay K1 closes, the first situation：When ECU control K1 closures, closed as K1 is actual, optocoupler OP1 is turned on, and RL_ST exports corresponding low level electric signal, and ECU judges that relay closure is normal when detecting this signal；Conversely, When ECU control K1 closures, and K1 is actually not closed, then optocoupler OP1 is not turned on, RL_ST without corresponding low level electric signal, ECU is detected without corresponding electric signal, judges that relay closure is abnormal；Second of situation：When ECU does not control K1 to close or control When K1 processed disconnects, and K1 has actually been closed, and optocoupler OP1 conductings, RL_ST exports corresponding low level electric signal, and ECU is detected Relay adhesion is judged during this signal.
- A kind of 5. failure detector circuit, it is characterised in that including ECU ECU, insulating power supply and isolation optocoupler, the isolation The output of power supply is connected by fuse with isolation optocoupler, the signal output part of the isolation optocoupler and the ECU ECU Connection, the output all the way of the ECU ECU are used for active circuit, and the ECU ECU is by detecting the isolation light The output signal of coupling judges whether the fuse breaks down, and the insulating power supply includes voltage stabilizing chip U1 and isolation voltage Chip U2, the voltage stabilizing chip U1 are in series with isolation voltage chip U2, and voltage stabilizing chip U1 input is terminated with filter capacitor C5 It is connected with voltage-stabiliser tube DP1, power input PWR by diode D2 with filter capacitor C5 and voltage-stabiliser tube DP1 public connecting end； Connect after the filter circuit that voltage stabilizing chip U1 output forms through electric capacity C4, E2, E1, C3 and inductance L2 with isolation voltage chip U2 Connect, wherein C4 is connected with the common port after E2 parallel connections with L2 one end, and the common port after the L2 other end is in parallel with E1, C3 connects Connect, isolation voltage chip U2 output end is connected by inductance L1 with the common port after electric capacity C1, C2 parallel connection, after C1, C2 parallel connection One end also with diode D1 of common port be connected, diode D3 is in parallel with electric capacity C1, C2, and the diode D1 other end passes through One end of resistance R1 and fuse connects, the other end connection optocoupler OP1 of fuse input, and the OP1 outputs of optocoupler are corresponding Electric signal, optocoupler OP1 output end is connected with triode T1 base stage, and the emitter stage of triode is grounded by resistance R7, collection Electrode is connected with power input PWR and signal output part RL_ST respectively by diode D5.
- 6. failure detector circuit according to claim 5, it is characterised in that after ECU activation signal active circuit, every From power supply export an isolation voltage, ECU by the electric signal on signal lines RL_ST come determine insurance whether disconnection；When When insurance F1 does not disconnect, optocoupler OP1 conductings, RL_ST exports corresponding low level electric signal, and ECU judges when detecting this signal Insurance does not disconnect；When insuring disconnection, optocoupler OP1 is not turned on, and RL_ST detects RL_ without corresponding low level electric signal, ECU ST judges that insurance has disconnected without corresponding electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270012.0A CN104914377B (en) | 2015-05-26 | 2015-05-26 | A kind of failure detector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510270012.0A CN104914377B (en) | 2015-05-26 | 2015-05-26 | A kind of failure detector circuit |
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| Publication Number | Publication Date |
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| CN104914377A CN104914377A (en) | 2015-09-16 |
| CN104914377B true CN104914377B (en) | 2018-01-16 |
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| CN201510270012.0A Expired - Fee Related CN104914377B (en) | 2015-05-26 | 2015-05-26 | A kind of failure detector circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646215B (en) * | 2017-01-12 | 2019-07-02 | 中国计量大学 | Combination switch and its own switching fault judgment method |
| CN107015142A (en) * | 2017-04-01 | 2017-08-04 | 蚌埠市双环电子集团股份有限公司 | A kind of intelligent high-pressure D.C. contactor |
| CN109254244B (en) * | 2018-10-10 | 2021-09-17 | 中核控制系统工程有限公司 | Relay contact fault diagnosis system |
| CN112285540B (en) * | 2019-07-23 | 2024-03-22 | 杭州海康汽车技术有限公司 | Input acquisition control detection method and input acquisition control detection circuit |
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| US5134375A (en) * | 1990-03-27 | 1992-07-28 | Kabushiki Kaisha Toshiba | Relay checking device |
| WO2006102316A3 (en) * | 2005-03-23 | 2007-05-18 | Robertshaw Controls Co | Diagnostic circuit |
| CN203572931U (en) * | 2013-11-18 | 2014-04-30 | 深圳市易能电气技术有限公司 | Detection feedback circuit |
| CN204166078U (en) * | 2014-10-21 | 2015-02-18 | 晶澳(扬州)太阳能光伏工程有限公司 | A kind of switching detection device being applicable to switch, relay, fuse |
| CN204789923U (en) * | 2015-05-26 | 2015-11-18 | 吴小燕 | Failure detector circuit |
-
2015
- 2015-05-26 CN CN201510270012.0A patent/CN104914377B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5134375A (en) * | 1990-03-27 | 1992-07-28 | Kabushiki Kaisha Toshiba | Relay checking device |
| WO2006102316A3 (en) * | 2005-03-23 | 2007-05-18 | Robertshaw Controls Co | Diagnostic circuit |
| CN203572931U (en) * | 2013-11-18 | 2014-04-30 | 深圳市易能电气技术有限公司 | Detection feedback circuit |
| CN204166078U (en) * | 2014-10-21 | 2015-02-18 | 晶澳(扬州)太阳能光伏工程有限公司 | A kind of switching detection device being applicable to switch, relay, fuse |
| CN204789923U (en) * | 2015-05-26 | 2015-11-18 | 吴小燕 | Failure detector circuit |
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