CN209417237U - DC relay closed state detection device - Google Patents
DC relay closed state detection device Download PDFInfo
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- CN209417237U CN209417237U CN201821834710.4U CN201821834710U CN209417237U CN 209417237 U CN209417237 U CN 209417237U CN 201821834710 U CN201821834710 U CN 201821834710U CN 209417237 U CN209417237 U CN 209417237U
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- diode
- relay
- optocoupler
- circuit
- resistance
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Abstract
This application discloses a kind of DC relay closed state detection devices, the detection device includes pressure drop circuit and optocoupler detection circuit, the pressure drop circuit is in parallel with the contact S1 of relay, the pressure drop circuit is used to provide operating voltage to the optocoupler detection circuit when the contact S1 of relay is disconnected；The optocoupler detection circuit is connected with pressure drop circuit, and whether the contact S1 which is used to detect relay is in closed state.For the application when the contact S1 of relay is disconnected, pressure drop circuit provides operating voltage to optocoupler detection circuit, and optocoupler detection circuit is made to export low level；In the contact S1 closure of relay, pressure drop circuit can not provide operating voltage to optocoupler detection circuit, make optocoupler detection circuit output HIGH voltage；And then judge whether the contact S1 of electric appliance is in closed state by the level signal of the output of optocoupler detection circuit；Its circuit structure is simple, and high reliablity, production cost is low, has very high practical value.
Description
Technical field
This application involves new energy batteries to store energy technical fields, and in particular to a kind of DC relay closed state detection
Device.
Background technique
The contact performance measurement of relay, be in many applications it is necessary, otherwise can due to relay be closed it is bad and
Lead to equipment fault.
The contact performance measurement of relay is detected using the auxiliary contact that relay carries substantially at present.In relay
Increase auxiliary contact and not only increase the production of relay, design difficulty, also improves cost.Another method is to increase isolation
Power supply generation flows through contact current to detect relay contact state, although not needing relay carries auxiliary contact, isolation
Power supply cost is also higher.
Utility model content
In order to overcome the above-mentioned problems of the prior art, the main purpose of the application is that providing one kind can reduce life
Produce cost and the simple DC relay closed state detection device of circuit structure.
To achieve the goals above, the application specifically uses following technical scheme:
This application provides a kind of DC relay closed state detection device, which includes pressure drop circuit and light
Coupling detection circuit；The pressure drop circuit is in parallel with the contact S1 of relay, and the pressure drop circuit is used for the touching in the relay
When point S1 is disconnected, operating voltage is provided to the optocoupler detection circuit；The optocoupler detection circuit is connected with the pressure drop circuit,
Whether the contact S1 that the optocoupler detection circuit is used to detect the relay is in closed state.
Preferably, the contact S1 of the relay in the closure state, the optocoupler detection circuit exports high level；
When the contact S1 of the relay is in an off state, the optocoupler detection circuit exports low level.
Preferably, the pressure drop circuit includes resistance R1 and diode group；Wherein, the diode group includes at least two
The diode sequentially concatenated in the same direction, contact S1 of the positive or negative pole of the diode group through the resistance R1 Yu the relay
One end be connected.
Preferably, the resistance R1 uses posive temperature coefficient thermistor.
Preferably, the optocoupler detection circuit is in parallel with the diode group.
Preferably, the optocoupler detection circuit include optocoupler U1 and resistance R2, the optocoupler U1 and resistance R2 series connection after with
The diode group is in parallel.
Preferably, the detection device further includes protection circuit, and the protection circuit is connected with the pressure drop circuit；Institute
When stating the error-polarity connection of power supply of optocoupler detection circuit, the protection circuit is used to protect the reversed pressure drop of the optocoupler detection circuit
No more than its reverse withstand voltage.
Preferably, the protection circuit includes diode D3 and resistance R6, the diode D3 and the diode group, electricity
It is in parallel with the contact S1 of the relay after resistance R1 series connection, and the anode of the cathode of the diode D3 and the diode group
It is connected, the resistance R6 is in parallel with the diode group.
Preferably, the pressure drop circuit includes resistance R1, diode D1 and diode D2, and the optocoupler detection circuit includes
Optocoupler U1 and resistance R2；Wherein, one end of the contact S1 of the anode contact relay of the diode D2, the yin of the diode D2
Pole connects the anode of diode D1, and the cathode of the diode D1 is through the other end of the contact S1 of resistance R1 contact relay, the light
The anode of coupling U1 connects the anode of diode D2 through resistance R2, and the cathode of the optocoupler U1 connects the cathode of diode D1.
Preferably, the detection device further includes protection circuit, and the protection circuit includes diode D3 and resistance R6, institute
One end of the contact S1 of the anode contact relay of diode D3 is stated, the cathode of the diode D3 meets the anode of diode D2, institute
State the anode of a terminating diode D2 of resistance R6, the cathode of another terminating diode D1 of the resistance R6.
Compared with the prior art, the detection device of the application includes pressure drop circuit and optocoupler detection circuit.Wherein, pressure drop electricity
Road is in parallel with the contact S1 of relay, and optocoupler detection circuit is connected with pressure drop circuit；When the contact S1 of relay is disconnected, pressure drop
Circuit is used to provide operating voltage to optocoupler detection circuit, and optocoupler detection circuit is made to export low level；In the contact S1 of relay
When closure, pressure drop circuit is not used to provide operating voltage to optocoupler detection circuit, makes optocoupler detection circuit output HIGH voltage；Into
And judge whether the contact S1 of electric appliance is in closed state by the level signal of the output of optocoupler detection circuit；Its circuit knot
Structure is simple, high reliablity, production cost are low, has very high practical value.
Detailed description of the invention
Fig. 1 is the DC relay closure dress state detection device circuit diagram of the embodiment of the present application.
Specific embodiment
In order to make the objects, technical solutions and advantages of the application more.It is clear, with reference to the accompanying drawings and embodiments,
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application,
It is not used to limit the application.
Embodiments herein discloses a kind of DC relay closed state detection device, which includes pressure drop
Circuit, optocoupler detection circuit and protection circuit.Wherein, pressure drop circuit is in parallel with the contact S1 of relay, optocoupler detection circuit and
Protection circuit is connected with pressure drop circuit respectively.When the contact S1 of relay is disconnected, pressure drop circuit is for giving optocoupler detection circuit
Operating voltage is provided, optocoupler detection circuit is made to export low level；In the contact S1 closure of relay, pressure drop circuit is not used to
Operating voltage is provided to optocoupler detection circuit, makes optocoupler detection circuit output HIGH voltage；And then pass through the defeated of optocoupler detection circuit
The height of level signal judges whether the contact S1 of electric appliance is in closed state out.
Protection circuit is then used in the error-polarity connection of power supply of optocoupler detection circuit, guarantees the hair inside optocoupler detection circuit
The reversed pressure drop of optical diode is no more than its reverse withstand voltage, that is, the light emitting diode inside optocoupler detection circuit is protected not hit
It wears.
As shown in Figure 1, pressure drop circuit includes diode D1, diode D2 and resistance R1；Optocoupler detection circuit includes resistance
R2 and optocoupler U1；Protecting circuit includes diode D3 and resistance R6.Wherein, the anode of the cathode of diode D2 and diode D1 connect
Composition diode group is connect, which is used to provide operating voltage for optocoupler U1.The anode of diode D2 is with diode D3's
Cathode connection, one end of the contact S1 of the positive contact hair device of diode D3 and power end DC+-In.The cathode of diode D1 connects
One end of resistance R1, the other end of the contact S1 of another end in contact hair device of resistance R1 and the input terminal of DC load, direct current are negative
The output of load terminates power end DC-.The anode of a terminating diode D2 of resistance R6, another terminating diode D1's of resistance R6
Cathode.The anode of optocoupler U1 is connected through resistance R2 with the anode of diode D2, the cathode phase of the cathode and diode D1 of optocoupler U1
Even.In the present embodiment, capacitor C1 and resistance R5 represent DC load.
It is appreciated that three or three or more diodes can also be formed in the other embodiments of the application
Diode group, for providing operating voltage for optocoupler U1.
When work, in the case where external forward dc voltage is accessed between DC+_In and DC-:
When the contact S1 of relay is in an off state, there is a small starting current to pass through diode D3, two at this time
Pole pipe D2, diode D1, the circuit resistance R1 and load, and about 1.4V pressure drop, touching are generated at the light emitting diode both ends of optocoupler U1
The coupling U1 output that shines is low level.Meanwhile load voltage DC+_Out will rise to some value.
When relay contact S1 is in closed state, each diode and the circuit resistance R1 are short by relay contact S1 at this time
Road, at this time the light emitting diode both ends pressure drop of optocoupler U1 are 0V, and optocoupler U1 output is high level.Meanwhile load voltage DC+_Out
Input direct-current voltage DC+_In will be equal to.
And when accessing external reverse voltage between DC+_In and DC-:
When relay contact S1 is in an off state, the equal reverse bias of each diode, diode D3 bear almost institute at this time
There is backward voltage.Resistance R6 guarantees that, at this time in the generation about 0V pressure drop of the light emitting diode both ends of optocoupler U1, optocoupler U1 output is height
Level.Meanwhile load is also about 0V pressure drop, is protected.
In summary, it can decide whether closing relay by DC+_Out voltage, detection can be passed through later
Signal Out detects whether relay is closed success.
In the application, the setting of resistance R1 is to be provided initially for DC load when the contact S1 of relay is disconnected
Electric current, and limit the electric current of diode D1, diode D2 and diode D3 not excess definite value.I.e. by branch current limliting where R1 10
Within ampere, while resistance R1 is to play the work for protecting circuit in short circuit using positive temperature coefficient thermistor
With.It is appreciated that resistance R1 also can be set between diode D2 and diode D3 or be set to diode D3 and power supply
It holds between DC+_In.And resistance R1 can also using conventional, electric-resistance, then resistance R1 be only played using conventional, electric-resistance or resistance R1
The effect of current limliting.
In addition, the setting of resistance R2 is also for current limliting is played the role of, by branch current limliting where resistance R2 in the application
Within 10mA, to protect the forward current of the light emitting diode inside optocoupler U1 to be no more than its maximum value.It is appreciated that resistance
R2 also can be set between optocoupler U1 cathode and the cathode of diode D1.
In the present embodiment, optocoupler detection circuit further includes electric R3 and resistance R4.Wherein, one end of resistance R3 and optocoupler U1
Collector be electrically connected, the other end of resistance R3 is connect with power supply VCC, the emitter of one end of resistance R4 ground connection and optocoupler U1, electricity
The other end of resistance R4 is connected and as output end Signal Out with the collector of optocoupler U1.In the application, resistance R3 and resistance
R4 primarily serves the effect of partial pressure.
In application, when being such as used in energy storage inverter, the inside that capacitor C1, resistance R5 represent inverter is straight for specific implementation
It flows bus capacitor and no-load loss loads；DC+_Out connects on inverter internal DC bus；DC+_In and DC- is battery
External input terminals.Inverter power is 5kW, battery voltage 48V.
Dash current when to avoid battery from accessing needs to design soft starting circuit, then needs that relay is added, if after
Appliance contact electric current is about 150A.
Inverter by it is standby switch to operation before, to detect the contact closure condition of relay.Because if relay contact
Be closed it is bad then can because inverter band carries, and direct current survey voltage DC+_Out decline rapidly, cause inverter to protect.
It can decide whether closing relay by DC+_Out voltage according to the circuit of the application, it later can be with
Detect whether relay is closed success by detection signal Out.To ensure the normal operation of inverter.
The preferable specific embodiment of the above, only the application, but the protection scope of the application is not limited thereto,
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by anyone skilled in the art,
Should all it cover within the scope of protection of this application.Therefore, the protection scope of the application should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of DC relay closed state detection device, which is characterized in that including pressure drop circuit and optocoupler detection circuit；
The pressure drop circuit is in parallel with the contact S1 of relay, and the pressure drop circuit is used to disconnect in the contact S1 of the relay
When, operating voltage is provided to the optocoupler detection circuit；
The optocoupler detection circuit is connected with the pressure drop circuit, and the optocoupler detection circuit is used to detect the touching of the relay
Whether point S1 is in closed state.
2. DC relay closed state detection device according to claim 1, which is characterized in that in the relay
In the closure state, the optocoupler detection circuit exports high level to contact S1；It is in and disconnects in the contact S1 of the relay
When state, the optocoupler detection circuit exports low level.
3. DC relay closed state detection device according to claim 1, which is characterized in that the pressure drop circuit packet
Include resistance R1 and diode group；
Wherein, the diode group includes at least two diodes sequentially concatenated in the same direction, the anode of the diode group or negative
Pole is connected through the resistance R1 with one end of the contact S1 of the relay.
4. DC relay closed state detection device according to claim 3, which is characterized in that the resistance R1 is used
Posive temperature coefficient thermistor.
5. DC relay closed state detection device according to claim 3, which is characterized in that the optocoupler detection electricity
Road is in parallel with the diode group.
6. DC relay closed state detection device according to claim 5, which is characterized in that the optocoupler detection electricity
Road include optocoupler U1 and resistance R2, the optocoupler U1 and resistance R2 series connection after it is in parallel with the diode group.
7. DC relay closed state detection device according to claim 3, which is characterized in that the detection device is also
Including protecting circuit, the protection circuit is connected with the pressure drop circuit；In the error-polarity connection of power supply of the optocoupler detection circuit
When, the protection circuit is used to protect the reversed pressure drop of the optocoupler detection circuit to be no more than its reverse withstand voltage.
8. DC relay closed state detection device according to claim 7, which is characterized in that the protection circuit packet
Include diode D3 and resistance R6, contact with the relay after the diode D3 connects with the diode group, resistance R1
S1 is in parallel, and the cathode of the diode D3 is connected with the anode of the diode group, the resistance R6 and the diode
Group is in parallel.
9. DC relay closed state detection device according to claim 1, which is characterized in that the pressure drop circuit packet
Resistance R1, diode D1 and diode D2 are included, the optocoupler detection circuit includes optocoupler U1 and resistance R2；
Wherein, the cathode of one end of the contact S1 of the anode contact relay of the diode D2, the diode D2 connects diode
The anode of D1；The other end of contact S1 of the cathode of the diode D1 through resistance R1 contact relay, the anode of the optocoupler U1
The anode of diode D2 is connect through resistance R2, the cathode of the optocoupler U1 connects the cathode of diode D1.
10. DC relay closed state detection device according to claim 9, which is characterized in that the detection device
It further include protection circuit, the protection circuit includes diode D3 and resistance R6, the anode contact relay of the diode D3
One end of contact S1, the cathode of the diode D3 connect the anode of diode D2, a terminating diode D2's of the resistance R6
Anode, the cathode of another terminating diode D1 of the resistance R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821834710.4U CN209417237U (en) | 2018-11-08 | 2018-11-08 | DC relay closed state detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821834710.4U CN209417237U (en) | 2018-11-08 | 2018-11-08 | DC relay closed state detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209417237U true CN209417237U (en) | 2019-09-20 |
Family
ID=67933197
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821834710.4U Active CN209417237U (en) | 2018-11-08 | 2018-11-08 | DC relay closed state detection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN209417237U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444731A (en) * | 2018-11-08 | 2019-03-08 | 北京汇能精电科技股份有限公司 | DC relay closed state detection device |
-
2018
- 2018-11-08 CN CN201821834710.4U patent/CN209417237U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444731A (en) * | 2018-11-08 | 2019-03-08 | 北京汇能精电科技股份有限公司 | DC relay closed state detection device |
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