CN202978871U - Solid state relay - Google Patents
Solid state relay Download PDFInfo
- Publication number
- CN202978871U CN202978871U CN 201220643571 CN201220643571U CN202978871U CN 202978871 U CN202978871 U CN 202978871U CN 201220643571 CN201220643571 CN 201220643571 CN 201220643571 U CN201220643571 U CN 201220643571U CN 202978871 U CN202978871 U CN 202978871U
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- circuit
- state relay
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Abstract
The utility model discloses a solid state relay, and a technical problem to be solved is to provide a solid state relay separating solid state relay conduction voltage from cut-off voltage. In order to solve the problem, an employed technical scheme comprises an input circuit, an isolation circuit and an output circuit, and the solid state relay is characterized in that the input circuit is provided with a Schmidt trigger circuit, and the Schmidt trigger circuit can separate the solid state relay conduction voltage from the cut-off voltage. The solid state relay is provided, as shown by a graph 2 (incoming signal waveform), when voltage rises to a conduction threshold voltage value, the solid state relay is conducted, and if interference voltage fluctuates in a scope higher than the cut-off voltage, the conduction state of the solid state relay is unchanged; and as shown by the graph 2 (output control waveform), when voltage drops to a cut-off threshold voltage value, the solid state relay is cut off, and if the interference voltage fluctuates in a scope lower than energy conduction voltage, the cut-off state of the solid state relay is unchanged.
Description
Technical field
The utility model relates to a kind of low-voltage electrical apparatus, especially a kind of solid-state relay.
Background technology
Development along with modern electronic technology, occasion for isolation drive, isolation commutation circuit, formed the situation of photoelectricity isolation solid-state relay extensive use, conducting voltage and the cut-ff voltage approximately equal of the DC control solid-state relay of extensive use at present are when input is near critical value, because the electrical network noise disturbs, as motor etc., shake can appear in solid-state relay, can't regular event, cause out of control or misoperation, have a strong impact on stability and the control precision of control appliance.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of solid-state relay that the solid-state relay conducting voltage is separated with cut-ff voltage.
For addressing the above problem, the technical solution adopted in the utility model comprises input circuit, buffer circuit, output circuit, it is characterized in that: on described input circuit, Schmidt trigger circuit is set, described Schmidt trigger circuit makes the solid-state relay conducting voltage separate with cut-ff voltage.
Described solid-state relay, it is characterized in that: the described Schmidt trigger circuit of putting is mainly by resistance R 1, R2, R3, R4, capacitor C 2, voltage-stabiliser tube Z1, positive-negative-positive triode Q1, NPN type triode Q2 form, described positive-negative-positive triode Q1 and NPN type triode Q2 consist of positive feedback loop, and the conducting voltage of output is separated with cut-ff voltage.
Described solid-state relay is characterized in that: the constant-current source circuit that mainly is comprised of diode D1, D2 and resistance R 7 also is set on described input circuit, and described constant-current source circuit broadens the input voltage amplitude.
Described solid-state relay is characterized in that: the working state indicating circuit that mainly is comprised of resistance R 6 and light-emitting diode LD1 also is set on described input circuit.
Described solid-state relay is characterized in that: described output circuit is mainly by resistance R 10, R11, and diode D4, D5 and single-phase silicon-controlled T1, T2 form, and described single-phase silicon-controlled T1, T2 adopt reverse parallel connection.
Described solid-state relay is characterized in that: the bleeder circuit that mainly is comprised of resistance R 8 and R9 also is set, the dividing potential drop on described bleeder circuit dividing potential drop photoelectrical coupler on described output circuit.
Described solid-state relay is characterized in that: the RC resistance capaciting absorpting circuit that mainly is comprised of resistance R 12 and capacitor C 3 also is set on described output circuit.
Described solid-state relay is characterized in that: described buffer circuit adopts the zero cross fired photoelectrical coupler.
Solid-state relay of the present utility model, as shown in Fig. 2 (waveform input signal), when voltage rises to the turn-on threshold magnitude of voltage, the solid-state relay conducting, if this moment, interference voltage fluctuateed in the scope higher than cut-ff voltage, solid-state relay keeps conducting state constant; As shown in Fig. 2 (output control waveform), to the cut-off threshold magnitude of voltage, solid-state relay ends when voltage drop, if this moment, interference voltage can fluctuate in the scope of voltage lower than leading, the remain off state is constant always for solid-state relay.The difference of conducting ~ cut-ff voltage is exactly the hysteresis value, the hysteresis value is larger, the solid-state relay reaction is more blunt, and control precision reduces, otherwise, antijamming capability is step-down, experiment showed, as properly at 1 ~ 1.5V in the hysteresis value, both guaranteed control precision, make again product meet relevant EMC standard, greatly improved and done jamming performance and control precision.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is circuit diagram of the present utility model;
The input-output wave shape figure of Fig. 2 utility model.
Embodiment
To shown in Figure 2, solid-state relay of the present utility model comprises input circuit, buffer circuit, output circuit, on described input circuit, Schmidt trigger circuit is set as Fig. 1, and described Schmidt trigger circuit makes the solid-state relay conducting voltage separate with cut-ff voltage.
The described Schmidt trigger circuit of putting is mainly by resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 2, voltage-stabiliser tube Z1, positive-negative-positive triode Q1, NPN type triode Q2 form, described positive-negative-positive triode Q1 and NPN type triode Q2 consist of positive feedback loop, and the conducting voltage of output is separated with cut-ff voltage.
The constant-current source circuit that mainly is comprised of diode D1, diode D2 and resistance R 7 also is set on described input circuit, the input voltage amplitude is broadened, in DC4 ~ 36V scope, switching tube Q3 can drive photoelectrical coupler reliably, avoid burning out because input current is excessive optocoupler, improve the reliability of solid-state relay.The working state indicating circuit that mainly is comprised of resistance R 6 and light-emitting diode LD1 also is set on described input circuit, refers to during the solid-state relay conducting that lamp is bright, extinguish during cut-off.Described output circuit is mainly by resistance R 10, resistance R 11, diode D4, diode D5 and single-phase silicon-controlled T1, single-phase silicon-controlled T2 form, described single-phase silicon-controlled T1, single-phase silicon-controlled T2 adopt reverse parallel connection, increase the silicon controlled area of dissipation, when using large electric current, heating evenly, improves product reliability.The bleeder circuit that mainly is comprised of resistance R 8 and R9 also is set on described output circuit, and the dividing potential drop on described bleeder circuit dividing potential drop photoelectrical coupler improves product reliability.The RC resistance capaciting absorpting circuit that mainly is comprised of resistance R 12 and capacitor C 3 also is set on described output circuit, avoids controllable silicon to cause false triggering because of external disturbance, improve and do interference performance.Described buffer circuit adopts the zero cross fired photoelectrical coupler, photoelectrical coupler IC1 is a kind of semiconductor photoelectric device, and it has that volume is little, the life-span is long, antijamming capability is strong, working temperature is wide and contactless input and output, characteristics such as isolation, zero phase triggering fully on electric.
The course of work:
Turn on process, as shown in Figure 1, input voltage range is 0～36 V, initial value is 0 V.This moment, photoelectrical coupler was in off state, not conducting of circuit.Resistance R 2 consists of triode input minute hydraulic circuit with resistance R 4, and positive-negative-positive triode Q1 base voltage is the upper voltage of voltage-stabiliser tube Z1, and substantially constant is constant.Increase gradually input voltage, when positive-negative-positive triode Q1 emitter voltage surpasses base voltage (ignoring the triode pressure drop), positive-negative-positive triode Q1 conducting, NPN type triode Q2 conducting then.Then drive control switch pipe Q3, the light-emitting diode in optocoupler is switched on, and optical coupler converts by phototriode the light that light-emitting diode sends to photoelectric current, the optocoupler conducting, thereby with the output circuit conducting.
Procedures of turn-off when relay returns, reduces input voltage gradually, NPN type triode Q2 base stage bias current this moment voltage returns by resistance R 3 voltage that feedback comes and keeps, along with the reduction of voltage, slightly during high 0.7 V, this moment, voltage was critical voltage to NPN type triode Q2 collector voltage than emitter voltage.When voltage drops to critical value when following, NPN type triode Q2 will end, and after NPN type triode Q2 cut-off, switching tube Q3 also ends, also cut-off thereupon of light-emitting diode in optical coupler, thus make whole circuit be in cut-off state.
The above is only preferred embodiment of the present utility model, not in order to limiting the utility model, all any modifications of doing within spirit of the present utility model and principle, is equal to and replaces and improvement etc., within all being included in protection range of the present utility model.
Claims (8)
1. a solid-state relay, comprise input circuit, buffer circuit, output circuit, it is characterized in that: on described input circuit, Schmidt trigger circuit is set, described Schmidt trigger circuit makes the solid-state relay conducting voltage separate with cut-ff voltage.
2. solid-state relay according to claim 1, it is characterized in that: the described Schmidt trigger circuit of putting is mainly by resistance R 1, R2, R3, R4, capacitor C 2, voltage-stabiliser tube Z1, positive-negative-positive triode Q1, NPN type triode Q2 form, described positive-negative-positive triode Q1 and NPN type triode Q2 consist of positive feedback loop, and the conducting voltage of output is separated with cut-ff voltage.
3. solid-state relay according to claim 1, it is characterized in that: the constant-current source circuit that mainly is comprised of diode D1, D2 and resistance R 7 also is set on described input circuit, and described constant-current source circuit broadens the input voltage amplitude.
4. solid-state relay according to claim 1, is characterized in that: the working state indicating circuit that mainly is comprised of resistance R 6 and light-emitting diode LD1 also is set on described input circuit.
5. solid-state relay according to claim 1, it is characterized in that: described output circuit is mainly by resistance R 10, R11, and diode D4, D5 and single-phase silicon-controlled T1, T2 form, and described single-phase silicon-controlled T1, T2 adopt reverse parallel connection.
6. solid-state relay according to claim 1, is characterized in that: the bleeder circuit that mainly is comprised of resistance R 8 and R9 also is set, the voltage on described bleeder circuit dividing potential drop photoelectrical coupler on described output circuit.
7. solid-state relay according to claim 1, is characterized in that: the RC resistance capaciting absorpting circuit that mainly is comprised of resistance R 12 and capacitor C 3 also is set on described output circuit.
8. solid-state relay according to claim 1, it is characterized in that: described buffer circuit adopts the zero cross fired photoelectrical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220643571 CN202978871U (en) | 2012-11-29 | 2012-11-29 | Solid state relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220643571 CN202978871U (en) | 2012-11-29 | 2012-11-29 | Solid state relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978871U true CN202978871U (en) | 2013-06-05 |
Family
ID=48519889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220643571 Expired - Fee Related CN202978871U (en) | 2012-11-29 | 2012-11-29 | Solid state relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978871U (en) |
-
2012
- 2012-11-29 CN CN 201220643571 patent/CN202978871U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20161129 |