CN204288040U - A kind of power feedback - Google Patents
A kind of power feedback Download PDFInfo
- Publication number
- CN204288040U CN204288040U CN201420850133.3U CN201420850133U CN204288040U CN 204288040 U CN204288040 U CN 204288040U CN 201420850133 U CN201420850133 U CN 201420850133U CN 204288040 U CN204288040 U CN 204288040U
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- optocoupler
- feedback circuit
- power
- feedback
- shunt resistance
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Abstract
The utility model provides a kind of power feedback, comprises the first different feedback circuit of structure and the second feedback circuit; Described second feedback circuit is as redundant feedback circuit, and its impedance is greater than described first feedback circuit.Compared with prior art, the beneficial effect of this programme shows: when realizing a damage wherein by two-way feedback circuit, can carry out feedback adjusting by another feedback circuit to power supply; Adopt the two-way feedback circuit that structure is different, avoid damaging while causing due to problem of the same race of feedback circuit; Different by the impedance magnitude arranged in two feedback circuits, in normal state, the impedance of redundant feedback circuit is comparatively large, and electric current is by the first feedback circuit, and when the first feedback circuit damages, electric current automatic stream redundant feedback circuit, realizes automatically switching.
Description
Technical field
The utility model belongs to power supply debugging technique field, particularly relates to a kind of power feedback.。
Background technology
Along with the develop rapidly of power electronics, highly reliable power supply is increasing in the demand in commercial unit field, the single backfeed loop of general power acquisition ensures the stable output of power supply, backfeed loop is made up of bleeder circuit, voltage reference circuit, error amplifying circuit, isolation optocoupler, realizes the feedback to output voltage.
At present, owing to only having a road backfeed loop in circuit, when forming arbitrary fault of backfeed loop, the uncontrollable output voltage of power supply, generally can cause electric power output voltage to raise, and damages power supply, and likely damages power supply object further.
Utility model content
The purpose of this utility model is to overcome prior art defect, proposes a kind of power feedback, damages to solve single feedback circuit in prior art, causes the problem cannot carrying out feeding back to power supply debugging.
For reaching above object, the utility model takes following technical scheme to be achieved:
A kind of power feedback, comprising: the first backfeed loop that structure is different and the second feedback circuit; Described second feedback circuit is as redundant feedback circuit, and its impedance is greater than described first feedback circuit.
Described first feedback circuit is made up of the first shunt resistance, the second shunt resistance, comparer and the first optocoupler.
The structure of described first feedback circuit, specifically comprises: described first shunt resistance, and its one end connects power supply positive output end, and its other end connects one end of described second shunt resistance; Described second shunt resistance, its other end connects power-output terminal; Described comparer, its negative pole end is connected with described power-output terminal, and its reference edge is connected between described first shunt resistance and the second shunt resistance, and its positive terminal connects the negative pole end of the photodiode of described first optocoupler; Described first optocoupler, the positive terminal of its light emitting diode connects described power supply positive output end, the collector terminal of its phototriode as control loop feed back input, ground, the emitter terminal connection control loop of its phototriode.
Also comprise: be serially connected in the current-limiting resistance between the positive terminal of the light emitting diode of described first optocoupler and described power supply positive output end.
Also comprise: the building-out capacitor and the first compensating resistance that form the compensating circuit of described comparer; One end of described building-out capacitor connects the positive terminal of described comparer, and its other end connects one end of described first compensating resistance, and the other end of described first compensating resistance connects the reference edge of described comparer.
Also comprise: as the second compensating resistance of the compensating circuit of described first optocoupler; Described second compensating resistance is connected in parallel on the two ends of the light emitting diode of described first optocoupler.
When electric power output voltage is higher than normal value, the light emitting diode of described power supply positive output end, the first optocoupler, comparer and power-output terminal conduct; The phototriode conducting of described first optocoupler.
Described second feedback circuit is made up of the 3rd shunt resistance, voltage stabilizing diode and the second optocoupler.
The structure of described second feedback circuit, specifically comprises: described voltage stabilizing diode, and its negative pole end connects power supply positive output end, and its positive terminal connects one end of described 3rd shunt resistance; Described 3rd shunt resistance, its other end is connected with the positive terminal of the light emitting diode of described second optocoupler; Described second optocoupler, the negative pole end of its light emitting diode is connected with power-output terminal, the collector terminal of its phototriode as control loop feed back input, ground, the emitter terminal connection control loop of its phototriode.
When electric power output voltage is higher than normal value, the light emitting diode of described power supply positive output end, voltage stabilizing diode, the 3rd shunt resistance, the second optocoupler, the conducting of power-output terminal; The phototriode conducting of described second optocoupler.
Compared with prior art, the beneficial effect of this programme shows the following aspects:
1, realized by two-way feedback circuit, when a feedback circuit damages, feedback debugging can be carried out by another feedback circuit to power supply wherein;
2, adopt the two-way feedback circuit that structure is different, avoid damaging while causing due to problem of the same race of feedback circuit;
3, the impedance magnitude by arranging in two feedback circuits is different, and in normal state, the impedance of redundant feedback circuit is very large, and electric current is by the first feedback circuit, and when the first feedback circuit damages, electric current automatic stream redundant feedback circuit, realizes automatically switching.
Accompanying drawing explanation
Fig. 1 be the present embodiment realize schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
See Fig. 1, be circuit theory diagrams of the present utility model, the utility model is made up of two parts, first backfeed loop 1 and second feed back loop 2, wherein the first backfeed loop 1 is responsible for accurate feedback, ensures power supply under normal circumstances, has excellent precision and Adjustment Performance; Second feed back loop 2 is redundant feedback loop, when ensureing that the first backfeed loop 1 is nonserviceabled, ensures that power supply exports and does not exceed safe range.
Preferably, described second feedback circuit 2 is as redundant feedback circuit, and its impedance is greater than described first feedback circuit 1.
Described first feedback circuit 1 is made up of the first shunt resistance R1, the second shunt resistance R2, comparer U1 and the first optocoupler U2.
The structure of described first feedback circuit 1, specifically comprises:
Described first shunt resistance R1, its one end connects power supply positive output end, and its other end connects one end of described second shunt resistance R2;
Described second shunt resistance R2, its other end connects power-output terminal;
Described comparer U1, its negative pole end 2 is connected with described power-output terminal, and its reference edge 1 is connected between described first shunt resistance R1 and the second shunt resistance R2, and its positive terminal 3 connects the negative pole end of the light emitting diode of described first optocoupler;
Described first optocoupler U2, the positive terminal of its light emitting diode connects described power supply positive output end, the collector terminal of its phototriode as control loop feed back input, ground, the collector emitter end connection control loop of its phototriode.
Be serially connected in the current-limiting resistance R4 between the positive terminal of the light emitting diode of described first optocoupler and described power supply positive output end.
Form building-out capacitor C1 and the first compensating resistance R3 of the compensating circuit of described comparer;
One end of described building-out capacitor C1 connects the positive terminal of described comparer, and its other end connects one end of described first compensating resistance R3, and the other end of described first compensating resistance connects the reference edge of described comparer.
As the second compensating resistance R5 of the compensating circuit of described first optocoupler;
Described second compensating resistance R5 is connected in parallel on the two ends of the light emitting diode of described first optocoupler.
When electric power output voltage is higher than normal value, the light emitting diode of described power supply positive output end, the first optocoupler U2, comparer U1 and power-output terminal conduct; The phototriode conducting of described first optocoupler.
The course of work of the first backfeed loop 1 is: the output voltage of power supply, after the first shunt resistance R1 and R2 dividing potential drop, be supplied to benchmark input end 1 pin of comparer U1, and the internal reference of U1 compares; When the output voltage of power supply after shunt resistance R1 and R2 dividing potential drop higher than U1 internal reference voltage, the 3 pin conductings of comparer U1, LED luminous flux in optocoupler U2 increases, and causes the phototriode conducting of U2 optocoupler internal output terminal, control loop feedback input end voltage is reduced; When the output voltage of power supply after R1 and R2 dividing potential drop lower than U1 internal reference voltage, 3 pin of U1 are closed, LED luminous flux in optocoupler U2 reduces, and causes the phototriode of U2 optocoupler internal output terminal to be closed, control loop feed back input terminal voltage is raised; So complete negative feedback process.
Described second feedback circuit is made up of the 3rd shunt resistance R11, voltage stabilizing diode D1 and the second optocoupler U3.
The structure of described second feedback circuit, specifically comprises:
Described voltage stabilizing diode D1, its negative pole end 3 connects power supply positive output end, and its positive terminal connects one end of described 3rd shunt resistance R11;
Described 3rd shunt resistance R11, its other end is connected with the positive terminal of the light emitting diode of described second optocoupler U3;
Described second optocoupler U3, the negative pole end of its light emitting diode is connected with power-output terminal, the collector terminal of its phototriode as control loop feed back input, ground, the emitter terminal connection control loop of its phototriode.
The course of work of second feed back loop 2 is: when power supply output voltage higher than D1 and U3 optocoupler interior light emitting diodes forward voltage and time, LED luminous flux in optocoupler U3 increases, cause the phototriode conducting of U3 optocoupler internal output terminal, control loop feedback input end voltage is reduced; The output voltage of power supply lower than D1 and U3 optocoupler interior light emitting diodes forward voltage and time, the LED luminous flux in optocoupler U3 reduces, and causes the phototriode of U3 optocoupler internal output terminal to be closed, control loop feed back input terminal voltage is raised; So complete negative feedback process.
In the present embodiment, the feedback voltage of second feed back loop 2 is set to the feedback voltage higher than the first backfeed loop 1, and when the first backfeed loop 1 is normal, second feed back loop 2 exports as high resistant, and the feed back input of control loop is determined by the first backfeed loop 1; When the first backfeed loop 1 fault, generally the phototriode of U2 internal output terminal is open-circuit condition, and the feed back input of control loop is determined by second feed back loop 2; So automatically complete fault backfeed loop handoff procedure.
For the circuit of setting forth in each embodiment of the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. a power feedback, is characterized in that, comprising: the first feedback circuit (1) that structure is different and the second feedback circuit (2); Described second feedback circuit (2) is as redundant feedback circuit, and its impedance is greater than described first feedback circuit (1);
Described first backfeed loop (1) is made up of the first shunt resistance R1, the second shunt resistance R2, comparer U1 and the first optocoupler U2;
The structure of the first backfeed loop (1), specifically comprises: described first shunt resistance R1, and its one end connects power supply positive output end, and its other end connects one end of described second shunt resistance R2;
Described second shunt resistance R2, its other end connects power-output terminal;
Described comparer U1, its negative pole end is connected with described power-output terminal, and its reference edge is connected between described first shunt resistance R1 and the second shunt resistance R2, and its positive terminal connects the negative pole end of the light emitting diode of described first optocoupler;
Described first optocoupler U2, the positive terminal of its light emitting diode connects described power supply positive output end, the collector terminal of its phototriode as control loop feed back input, ground, the collector emitter end connection control loop of its phototriode.
2. power feedback according to claim 1, is characterized in that, also comprises:
Be serially connected in the current-limiting resistance R4 between the positive terminal of the light emitting diode of described first optocoupler U2 and described power supply positive output end.
3. power feedback according to claim 1, is characterized in that, also comprises: the building-out capacitor C1 and the first compensating resistance R3 that form the compensating circuit of described comparer;
One end of described building-out capacitor C1 connects the positive terminal of described comparer, and its other end connects one end of described first compensating resistance R3, and the other end of described first compensating resistance connects the reference edge of described comparer.
4. power feedback according to claim 1, is characterized in that, also comprises: as the second compensating resistance R5 of the compensating circuit of described first optocoupler;
Described second compensating resistance R5 is connected in parallel on the two ends of the light emitting diode of described first optocoupler U2.
5. power feedback according to claim 1, is characterized in that, when electric power output voltage is higher than normal value, the light emitting diode of described power supply positive output end, the first optocoupler U2, comparer U1 and power-output terminal conduct; The phototriode conducting of described first optocoupler U2.
6. power feedback according to claim 1, is characterized in that, described second feedback circuit (2) is made up of the 3rd shunt resistance R11, voltage stabilizing diode D1 and the second optocoupler U3.
7. power feedback according to claim 6, is characterized in that, the structure of described second feedback circuit (2), specifically comprises:
Described voltage stabilizing diode D1, its negative pole end connects power supply positive output end, and its positive terminal connects one end of described 3rd shunt resistance R11;
Described 3rd shunt resistance R11, its other end is connected with the positive terminal of the light emitting diode of described second optocoupler U3;
Described second optocoupler U3, the negative pole end of its light emitting diode is connected with power-output terminal, the collector terminal of its phototriode as control loop feed back input, ground, the emitter terminal connection control loop of its phototriode.
8. power feedback according to claim 7, it is characterized in that, when electric power output voltage is higher than normal value, the light emitting diode of described power supply positive output end, voltage stabilizing diode D1, the 3rd shunt resistance R11, the second optocoupler U3, the conducting of power-output terminal; The phototriode conducting of described second optocoupler U3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850133.3U CN204288040U (en) | 2014-12-27 | 2014-12-27 | A kind of power feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420850133.3U CN204288040U (en) | 2014-12-27 | 2014-12-27 | A kind of power feedback |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204288040U true CN204288040U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420850133.3U Expired - Fee Related CN204288040U (en) | 2014-12-27 | 2014-12-27 | A kind of power feedback |
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| CN (1) | CN204288040U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323931A (en) * | 2019-08-15 | 2019-10-11 | 荣信汇科电气技术有限责任公司 | A kind of redundancy trigger circuit comprising state feedback function |
| CN114337297A (en) * | 2021-12-15 | 2022-04-12 | 珠海格力电器股份有限公司 | Switching power supply's feedback circuit, switching power supply and consumer |
-
2014
- 2014-12-27 CN CN201420850133.3U patent/CN204288040U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110323931A (en) * | 2019-08-15 | 2019-10-11 | 荣信汇科电气技术有限责任公司 | A kind of redundancy trigger circuit comprising state feedback function |
| CN110323931B (en) * | 2019-08-15 | 2024-05-10 | 荣信汇科电气股份有限公司 | Redundant trigger circuit containing state feedback function |
| CN114337297A (en) * | 2021-12-15 | 2022-04-12 | 珠海格力电器股份有限公司 | Switching power supply's feedback circuit, switching power supply and consumer |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20201227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |