CN201758271U - Standby protection circuit without optical coupler - Google Patents
Standby protection circuit without optical coupler Download PDFInfo
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- CN201758271U CN201758271U CN201020241085XU CN201020241085U CN201758271U CN 201758271 U CN201758271 U CN 201758271U CN 201020241085X U CN201020241085X U CN 201020241085XU CN 201020241085 U CN201020241085 U CN 201020241085U CN 201758271 U CN201758271 U CN 201758271U
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- circuit
- optocoupler
- triode
- protection circuit
- resistance
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- 230000003287 optical effect Effects 0.000 title abstract 7
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 230000005669 field effect Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract 2
- 230000005856 abnormality Effects 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
A standby protection circuit without an optical coupler comprises a standby circuit and a sampling circuit. An electronic switch is connected to the input end of the standby circuit in a bypass manner, and an optical coupler OP2 is arranged at the output end of the standby circuit. The sampling circuit is connected with the electronic switch, a sampling terminal is arranged at the input end of the sampling circuit, and the output end of the sampling circuit is connected with the electronic switch. When the input end of the standby circuit is low in level, the optical coupler OP2 is switched off, and the integral circuit is in a normal standby state. The optical coupler OP2 is switched on when the input end of the standby circuit is high in level. When voltage is normal, the electronic switch is switched off, and the integral circuit normally operates. If the voltage is abnormal, the sampling terminal of the sampling circuit can receive a high level, then the electronic switch is switched on to pull the voltage of the input end of the standby circuit to a low level so that the optical coupler OP2 is switched off, and the integral circuit is in an abnormal standby state. A power supply is switched off after abnormality is eliminated, the input end of the standby circuit immediately recovers low level, the optical coupler OP2 is still switched off, and the integral circuit is in the normal standby state again.
Description
Technical field
The utility model relates to a kind of circuit, the concrete idle protection circuit that is meant no optocoupler.
Background technology
Usually household appliances all have stand-by circuit, cut off the power supply of main circuit when standby, are only powered to CPU by stand-by circuit, thereby realize low-power consumption.For in the unusual effective protective circuit of output voltage, comparatively common protection scheme multiclass is similar to the circuit structure shown in Figure 1 of Figure of description, establishes a protective circuit that is independent of stand-by circuit, and both independently use optocoupler to isolate separately; Shown in the figure, 12 pin of IC3 are connected with stand-by circuit by optocoupler OP2, and 8 pin are connected with protective circuit by optocoupler OP1.
In the enforcement circuit of such scheme, protective circuit must additionally adopt independent optocoupler, and because stand-by circuit and protective circuit branch are arranged; required components and parts are more, and the area of busy line plate is bigger, occur fault easily; therefore stability is not good, and cost is also high.
The utility model content
The purpose of this utility model is the circuit of prior art is optimized, and stand-by circuit and protective circuit are combined, and discharges the circuit board space by the quantity of simplifying components and parts, significantly promotes the cost performance of circuit.
To achieve these goals, the utility model proposes a kind of idle protection circuit that does not have optocoupler, specific as follows.
The idle protection circuit of no optocoupler comprises stand-by circuit, and its input side connects an electronic switch; its output then is provided with an optocoupler OP2; also be provided with the sample circuit that is connected with electronic switch, its input is provided with the sampling terminal, and its output then is connected with this electronic switch.Optocoupler OP2 ended when the input of stand-by circuit was low level, and entire circuit is in normal holding state; Optocoupler OP2 conducting when the input of stand-by circuit is high level, voltage just often, electronic switch ends, the entire circuit operate as normal, if electric voltage exception occurs, the sampling terminal of sample circuit can be received a high level, and the conducting electronic switch drags down into low level with the voltage of stand-by circuit input optocoupler OP2 is ended then, and entire circuit is in unusual holding state; Get rid of unusual back power cutoff, the input of stand-by circuit reverts to low level immediately, and optocoupler OP2 still ends, and entire circuit is in normal holding state again.
As improvement of the technical scheme, be provided with N-channel MOS field effect transistor Q6 in the stand-by circuit, its base stage is connected with the input of stand-by circuit, its source ground, its grid is connected with optocoupler OP2, goes back resistance R 80 of cross-over connection between its source electrode and the base stage.
Further, be provided with the capacitor C 38 in parallel with resistance R 80.
As improvement of the technical scheme, described electronic switch is PNP triode Q8, and its emitter is connected with the input of stand-by circuit, and its collector electrode is connected with the output of sample circuit, goes back resistance R 85 of cross-over connection between its base stage and the emitter.
Further, be provided with the capacitor C 40 in parallel with resistance R 85.
As improvement of the technical scheme, described sample circuit is provided with two sampling terminal PORT1 and PORT2, sampling terminal PORT1 is the voltage stabilizing didoe ZD3 and the diode D10 that link to each other with anode of cascade successively, cascade is with anode continuous voltage stabilizing didoe ZD4 and diode D11 successively for sampling terminal PORT2, and diode D10 is connected by the collector electrode of resistance R 83 with triode Q8 with the negative electrode of diode D11.
Further, the output of described sample circuit also is provided with NPN triode Q7, and its base stage is connected with the collector electrode of triode Q8, and its collector electrode is connected with the base stage of triode Q8, and resistance R 84 of cross-over connection is gone back in its grounded emitter between its base stage and the emitter.
Further, be provided with the electric capacity R39 in parallel with resistance R 84.
In above-mentioned enforcement circuit, when the input signal ON/OFF of the input of stand-by circuit was low level, field effect transistor Q6, triode Q7, triode Q8 and optocoupler OP2 ended, and entire circuit is in normal holding state; The input signal ON/OFF of the input of stand-by circuit be high level and voltage just often, triode Q7, triode Q8 end, field effect transistor Q6, optocoupler OP2 conducting, the entire circuit operate as normal, if electric voltage exception occurs, the sampling terminal PORT1 of sample circuit or PORT2 can receive a high level, and triode Q7, triode Q8 conducting in succession drag down into low level with the voltage of stand-by circuit input field effect transistor Q6, optocoupler OP2 are ended, and entire circuit is in unusual holding state; Get rid of unusual back power cutoff, the input signal ON/OFF of the input of stand-by circuit reverts to low level immediately, and field effect transistor Q6, triode Q7, triode Q8 and optocoupler OP2 end, and entire circuit is in normal holding state again.
Compare with prior art, the beneficial effects of the utility model have been to simplify the quantity of components and parts, accomplish element stability few, raising product when density is high, have saved production cost, and machine product is more had superiority.
Description of drawings
Fig. 1 is idle protection circuit theory diagrams common in the prior art.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with specification drawings and specific embodiments the utility model is described further.
As shown in Figure 2, the idle protection circuit of no optocoupler comprises the stand-by circuit 1 and the sample circuit 2 of electrical connection.
Wherein, stand-by circuit 1 its input input signal ON/OFF, the side connects an electronic switch, its output then is provided with an optocoupler OP2, is provided with N-channel MOS field effect transistor Q6 in the stand-by circuit, and its base stage is connected with the input of stand-by circuit, its source ground, its grid is connected with optocoupler OP2, resistance R 80 of cross-over connection also between its source electrode and the base stage, the capacitor C 38 that is provided with in parallel with resistance R 80.
Described electronic switch is PNP triode Q8, and its emitter is connected with the input of stand-by circuit, and its collector electrode is connected with the output of sample circuit 2, resistance R 85 of cross-over connection also between its base stage and the emitter, the capacitor C 40 that is provided with in parallel with resistance R 85.
Wherein, sample circuit 2 its inputs are provided with two sampling terminal PORT1 and PORT2, sampling terminal PORT1 is the voltage stabilizing didoe ZD3 and the diode D10 that link to each other with anode of cascade successively, cascade is with anode continuous voltage stabilizing didoe ZD4 and diode D11 successively for sampling terminal PORT2, and diode D10 is connected by the collector electrode of resistance R 83 with triode Q8 with the negative electrode of diode D11.The output of described sample circuit 2 also is provided with NPN triode Q7, its base stage is connected with the collector electrode of triode Q8, and its collector electrode is connected with the base stage of triode Q8, its grounded emitter, resistance R 84 of cross-over connection also between its base stage and the emitter, the electric capacity R39 that is provided with in parallel with resistance R 84.
In above-mentioned enforcement circuit, when the input signal ON/OFF of the input of stand-by circuit 1 was low level, field effect transistor Q6, triode Q7, triode Q8 and optocoupler OP2 ended, and circuit is in normal holding state; The input signal ON/OFF of the input of stand-by circuit 1 be high level and voltage just often, triode Q7, triode Q8 end, field effect transistor Q6, optocoupler OP2 conducting, the entire circuit operate as normal, if electric voltage exception occurs, the sampling terminal PORT1 of sample circuit 2 or PORT2 can receive a high level, and triode Q7, triode Q8 conducting in succession drag down into low level with the voltage of stand-by circuit 1 input field effect transistor Q6, optocoupler OP2 are ended, and entire circuit is in unusual holding state; Get rid of unusual back power cutoff, the input signal ON/OFF of the input of stand-by circuit 1 reverts to low level immediately, and field effect transistor Q6, triode Q7, triode Q8 and optocoupler OP2 end, and entire circuit is in normal holding state again.
For a person skilled in the art, can obtain other various corresponding changes and distortion, and these all changes and distortion all belong to protection category of the present utility model according to structure and the principle that the utility model disclosed.
Claims (8)
1. do not have the idle protection circuit of optocoupler, it is characterized in that: comprise stand-by circuit, its input side connects an electronic switch; its output then is provided with an optocoupler OP2; also be provided with the sample circuit that is connected with electronic switch, its input is provided with the sampling terminal, and its output then is connected with this electronic switch.
2. the idle protection circuit of no optocoupler according to claim 1; it is characterized in that: be provided with N-channel MOS field effect transistor Q6 in the stand-by circuit; its base stage is connected with the input of stand-by circuit; its source ground; its grid is connected with optocoupler OP2, goes back resistance R 80 of cross-over connection between its source electrode and the base stage.
3. the idle protection circuit of no optocoupler according to claim 2 is characterized in that: be provided with the capacitor C 38 in parallel with resistance R 80.
4. the idle protection circuit of no optocoupler according to claim 3; it is characterized in that: described electronic switch is PNP triode Q8; its emitter is connected with the input of stand-by circuit; its collector electrode is connected with the output of sample circuit, goes back resistance R 85 of cross-over connection between its base stage and the emitter.
5. the idle protection circuit of no optocoupler according to claim 4 is characterized in that: be provided with the capacitor C 40 in parallel with resistance R 85.
6. the idle protection circuit of no optocoupler according to claim 5; it is characterized in that: described sample circuit is provided with two sampling terminal PORT1 and PORT2; sampling terminal PORT1 is the voltage stabilizing didoe ZD3 and the diode D10 that link to each other with anode of cascade successively; cascade is with anode continuous voltage stabilizing didoe ZD4 and diode D11 successively for sampling terminal PORT2, and diode D10 is connected by the collector electrode of resistance R 83 with triode Q8 with the negative electrode of diode D11.
7. the idle protection circuit of no optocoupler according to claim 1; it is characterized in that: the output of described sample circuit also is provided with NPN triode Q7; its base stage is connected with the collector electrode of triode Q8; its collector electrode is connected with the base stage of triode Q8; resistance R 84 of cross-over connection is gone back in its grounded emitter between its base stage and the emitter.
8. the idle protection circuit of no optocoupler according to claim 7 is characterized in that: be provided with the electric capacity R39 in parallel with resistance R 84.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020241085XU CN201758271U (en) | 2010-06-25 | 2010-06-25 | Standby protection circuit without optical coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020241085XU CN201758271U (en) | 2010-06-25 | 2010-06-25 | Standby protection circuit without optical coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201758271U true CN201758271U (en) | 2011-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020241085XU Expired - Fee Related CN201758271U (en) | 2010-06-25 | 2010-06-25 | Standby protection circuit without optical coupler |
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| Country | Link |
|---|---|
| CN (1) | CN201758271U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723946A (en) * | 2011-03-30 | 2012-10-10 | 上海军远通信设备有限公司 | Signal isolation control circuit |
| WO2013061207A1 (en) * | 2011-10-26 | 2013-05-02 | Koninklijke Philips Electronics N.V. | A low power standby shutdown circuit |
-
2010
- 2010-06-25 CN CN201020241085XU patent/CN201758271U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723946A (en) * | 2011-03-30 | 2012-10-10 | 上海军远通信设备有限公司 | Signal isolation control circuit |
| CN102723946B (en) * | 2011-03-30 | 2014-10-15 | 上海军远通信设备有限公司 | Signal isolation control circuit |
| WO2013061207A1 (en) * | 2011-10-26 | 2013-05-02 | Koninklijke Philips Electronics N.V. | A low power standby shutdown circuit |
| CN104025713A (en) * | 2011-10-26 | 2014-09-03 | 皇家飞利浦有限公司 | A low power standby shutdown circuit |
| CN104025713B (en) * | 2011-10-26 | 2018-10-26 | 飞利浦照明控股有限公司 | Low power standby breaking circuit and operating method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110309 Termination date: 20130625 |