CN104635040A - AC-DC power detection circuit of full-bridge rectifier load - Google Patents
AC-DC power detection circuit of full-bridge rectifier load Download PDFInfo
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- CN104635040A CN104635040A CN201310613978.0A CN201310613978A CN104635040A CN 104635040 A CN104635040 A CN 104635040A CN 201310613978 A CN201310613978 A CN 201310613978A CN 104635040 A CN104635040 A CN 104635040A
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Abstract
The invention relates to an AC-DC power detection circuit of a full-bridge rectifier load, at least comprising a rectifier filter circuit and a regulating circuit. The input end of the rectifier filter circuit is provided with an AC input port; the output end of the rectifier filter circuit and the output end of the regulating circuit are both provided with DC output ends; an AC input end connector is provided between the AC input port and an AC power supply; a DC output end connector is provided between the DC input ends and a load RL; the DC output end connector and the AC input end connector are electrically connected with a detection circuit; the DC output end connector is used for sensing current and voltage signals of the input end; the sensed current and voltage signals are provided for the detection circuit for processing; the AC input end connector is used for sensing current and voltage signals of the output end and providing the sensed current and voltage signals to be processed by the detection circuit. The full-bridge rectifier load AC-DC power detection circuit has the advantages that a phase difference between AC voltage and current can be provided and active power, apparent power and their ratio can be provided.
Description
This case is applying date 2013-11-08, and application number 2013105504289 applies for the divisional application of title " the high precision test circuit of a kind of full-bridge rectification bearing power and AC power ".
Technical field
The present invention relates to a kind of power to detect, particularly a kind of full-bridge rectification load alternating current-direct current power-sensing circuit.
Background technology
After exchanging 220v rectification, be directly carried in load by regulating circuit (constant current or constant voltage), there will be problem by the power factor (PF) detection of existing instrument to power supply.
(be the ratio of the active power that consumes of a load and its applied power, its numerical value is between 0 to 1 for English: Power Factor, abbreviation: PF) also known as power factor, be distinctive physical quantity in AC electric power systems for power factor.
Active power represents the ability that a circuit does work at special time, and applied power is the product of voltage and current effective value.The applied power of pure resistor load equals active power, and its power factor is 1.If the linear load that load is made up of inductance, electric capacity and resistance, energy back and forth may flow at load end and power end, and active power is declined.
Both power factor and electrical efficiency (English: Electrical efficiency) are different concepts, and the efficiency of an equipment is the ratio of output power relative to power input, different with power factor.After the one plant capacity factor promotes, the efficiency of equipment itself not necessarily can promote thereupon.But after power factor promotes, applied power and input current can reduce, and therefore the efficiency of electric power system can promote.
In alternating circuit, the cosine of the phase differential (Φ) between voltage and electric current is called power factor, represents with symbol cos Φ, and in online sexual intercourse current circuit, numerically power factor is the ratio of active power and applied power, i.e. cos Φ=P/S.Existing power factor detects and all provides based on this principle.This detection only detects the phase differential between alternating voltage and electric current, does not need to export real power to detect, and therefore to nonlinear load, the conclusion obtained is devious.
Summary of the invention
The object of this invention is to provide a kind of phase differential that can provide between alternating voltage and electric current, active power and its applied power and the full-bridge rectification bearing power of its ratio and the high precision test circuit of AC power can be provided again.
The object of the present invention is achieved like this, a kind of full-bridge rectification load alternating current-direct current power-sensing circuit, it is characterized in that: described testing circuit comprises display, button, processor, processor is electrically connected with display and button, processor is with multi-channel a/d converter port, multi-channel a/d converter port is electrically connected with the sensor output of DC output end interface respectively, the sensor of DC output end interface has current sensing unit and voltage sensor unit, the electric current of sensing and voltage signal are supplied to the processor process of testing circuit by current sensing unit and voltage sensor unit, multi-channel a/d converter port is electrically connected with the sensor output of ac input end interface respectively, the sensor of ac input end interface has current sensing unit and voltage sensor unit, the electric current of sensing and voltage signal are supplied to the processor process of testing circuit by current sensing unit and voltage sensor unit, and the result of processor process is presented at display.
Current sensing unit in described ac input end interface is serially connected with resistance R and light-emitting component GFS at input end, and light-emitting component GFS sends optical registration photoelectric cell GJS, and photoelectric cell GJS output voltage is electrically connected with A/D converter port; Voltage sensor unit is the mutual inductor L be socketed in ac circuit; The output terminal of mutual inductor L is electrically connected with A/D converter port.
Current sensing unit in described ac input end interface is that voltage transformer (VT) T one end is electrically connected with alternating current 220V, and voltage transformer (VT) T output terminal is electrically connected with A/D converter port at the voltage transformer (VT) T of input end serial connection; Voltage sensor unit is the mutual inductor L be socketed in ac circuit; The output terminal of mutual inductor L is electrically connected with A/D converter port.
Current sensing unit in described DC output end interface is in load circuit, be connected in series light emitting diode D, the light emission direction of light emitting diode D has photelectric receiver G, and the voltage received by photelectric receiver G or current value obtain average anode current; Voltage sensor unit in DC output end interface carries out dividing potential drop by resistance R1 and R2, and the voltage on R2 exports and provides DC output end voltage, and in order to not affect the impact of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
Current sensing unit in described DC output end interface is series resistor R0 in load circuit, and obtain voltage by resistance R0, resistance R0 is measuring resistance, weighs and obtains average anode current; Voltage sensor unit in DC output end interface carries out dividing potential drop by resistance R1 and R2, and the voltage on R2 exports and provides DC output end voltage, and in order to not affect the impact of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
Advantage of the present invention is: between ac input end mouth and AC power, have ac input end to connect, DC output end interface is had between DC output end and load RL, DC output end interface and ac input end interface are electrically connected with testing circuit, DC output end interface is used for electric current and the voltage signal of sense input, and the electric current of sensing and voltage signal are supplied to testing circuit process; Ac input end interface is used for electric current and the voltage signal of sense outputs, and the electric current of sensing and voltage signal are supplied to testing circuit process; Provide active power, applied power by testing circuit simultaneously, provide the ratio of active power and applied power.Sampled by processor, process, obtain alternating voltage, alternating current, DC voltage, DC current, alternating voltage and electric current adopt integral measurement, obtain average power.
Accompanying drawing explanation
Below in conjunction with embodiment accompanying drawing, the invention will be further described:
Fig. 1 is embodiment of the present invention circuit theory diagrams;
Fig. 2 is testing circuit schematic diagram;
Fig. 3 is ac input end interface-embodiment 1 circuit theory diagrams;
Fig. 4 is ac input end interface-embodiment 2 circuit theory diagrams;
Fig. 5 is DC output end interface-embodiment 1 circuit theory diagrams;
Fig. 6 is DC output end interface-embodiment 2 circuit theory diagrams.
In figure, 1, ac input end mouth; 2, ac input end interface; 3, display; 4, button; 5, testing circuit; 6, DC output end interface; 7, DC output end; 8, regulating circuit; 9, current rectifying and wave filtering circuit; 10, processor.
Embodiment
Embodiment 1
As shown in Figure 1, a kind of full-bridge rectification load alternating current-direct current power-sensing circuit, it is characterized in that: at least comprise current rectifying and wave filtering circuit 9 and regulating circuit 8, the input end of current rectifying and wave filtering circuit 9 is ac input end mouths 1, the output terminal of current rectifying and wave filtering circuit 9 and regulating circuit 8 is DC output ends 7, ac input end interface 2 is had between ac input end mouth 1 and AC power, DC output end interface 6 is had between DC output end 7 and load RL, DC output end interface 6 and ac input end interface 2 are electrically connected with testing circuit 5, DC output end interface 6 is for the electric current of sense input and voltage signal, the electric current of sensing and voltage signal are supplied to testing circuit 5 process, the electric current of sensing and voltage signal, for the electric current of sense outputs and voltage signal, are supplied to testing circuit 5 and process by ac input end interface 2, provide active power, applied power by testing circuit 5 simultaneously, provide the ratio of active power and applied power.
As shown in Figure 2, testing circuit 5 comprises display 3, button 4, processor 10, processor 10 is electrically connected with display 3 and button 4, processor 10 is with multi-channel a/d converter port, multi-channel a/d converter port is electrically connected with the sensor output of DC output end interface 6 respectively, the sensor of DC output end interface 6 has current sensing unit 601 and voltage sensor unit 602, and the processor 10 that the electric current of sensing and voltage signal are supplied to testing circuit 5 by current sensing unit 601 and voltage sensor unit 602 processes; Multi-channel a/d converter port is electrically connected with the sensor output of ac input end interface 2 respectively, the sensor of ac input end interface 2 has current sensing unit 201 and voltage sensor unit 202, the processor 10 that the electric current of sensing and voltage signal are supplied to testing circuit 5 by current sensing unit 201 and voltage sensor unit 202 processes, and the result that processor 10 processes is presented at display 3.
As shown in Figure 3, current sensing unit 601 in ac input end interface 2 is serially connected with resistance R and the nonpolarity light source of light-emitting component GFS(at input end), light-emitting component GFS(is nonpolarity light source) send optical registration photoelectric cell GJS, photoelectric cell GJS output voltage is electrically connected with A/D converter port.Voltage sensor unit 602 is the mutual inductor L be socketed in ac circuit.The output terminal of mutual inductor L is electrically connected with A/D converter port.
As shown in Figure 5, current sensing unit 201 in DC output end interface 6 is in load circuit, be connected in series light emitting diode D, the light emission direction of light emitting diode D has photelectric receiver G, the voltage received by photelectric receiver G or current value obtain average anode current.Voltage sensor unit 202 in DC output end interface 6 carries out dividing potential drop by resistance R1 and R2, voltage on R2 exports and provides DC output end voltage, in order to not affect the impact (mainly input impedance on the impact of A/D input end) of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
Embodiment 2
As different from Example 1: as shown in Figure 4, current sensing unit 601 in ac input end interface 2 is the voltage transformer (VT) T in input end serial connection, voltage transformer (VT) T one end is electrically connected with alternating current 220V, and voltage transformer (VT) T output terminal is electrically connected with A/D converter port.Voltage sensor unit 602 is the mutual inductor L be socketed in ac circuit.The output terminal of mutual inductor L is electrically connected with A/D converter port.
As shown in Figure 6, the current sensing unit 201 in DC output end interface 6 is series resistor R0 in load circuit, and obtain voltage by resistance R0, resistance R0 is measuring resistance, weighs and obtains average anode current.Identical with Fig. 5, voltage sensor unit 202 in DC output end interface 6 carries out dividing potential drop by resistance R1 and R2, voltage on R2 exports and provides DC output end voltage, in order to not affect the impact (mainly input impedance on the impact of A/D input end) of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
Ac input end interface 2 and DC output end interface 6 have interface, by conductor terminal, ac input end interface 2 and DC output end interface 6 signal are incorporated into testing circuit 5 input input port, be electrically connected with processor 10, sampled by processor 10, processed, obtain alternating voltage, alternating current, DC voltage, DC current, alternating voltage and electric current adopt integral measurement, obtain average power.
Claims (5)
1. a full-bridge rectification load alternating current-direct current power-sensing circuit, it is characterized in that: described testing circuit comprises display, button, processor, processor is electrically connected with display and button, processor is with multi-channel a/d converter port, multi-channel a/d converter port is electrically connected with the sensor output of DC output end interface respectively, the sensor of DC output end interface has current sensing unit and voltage sensor unit, and the electric current of sensing and voltage signal are supplied to the processor process of testing circuit by current sensing unit and voltage sensor unit; Multi-channel a/d converter port is electrically connected with the sensor output of ac input end interface respectively, the sensor of ac input end interface has current sensing unit and voltage sensor unit, the electric current of sensing and voltage signal are supplied to the processor process of testing circuit by current sensing unit and voltage sensor unit, and the result of processor process is presented at display.
2. a kind of full-bridge rectification load alternating current-direct current power-sensing circuit according to claim 1, it is characterized in that: the current sensing unit in described ac input end interface is serially connected with resistance R and light-emitting component GFS at input end, light-emitting component GFS sends optical registration photoelectric cell GJS, and photoelectric cell GJS output voltage is electrically connected with A/D converter port; Voltage sensor unit is the mutual inductor L be socketed in ac circuit; The output terminal of mutual inductor L is electrically connected with A/D converter port.
3. a kind of full-bridge rectification load alternating current-direct current power-sensing circuit according to claim 1, it is characterized in that: the current sensing unit in described ac input end interface is the voltage transformer (VT) T in input end serial connection, voltage transformer (VT) T one end is electrically connected with alternating current 220V, and voltage transformer (VT) T output terminal is electrically connected with A/D converter port; Voltage sensor unit is the mutual inductor L be socketed in ac circuit; The output terminal of mutual inductor L is electrically connected with A/D converter port.
4. a kind of full-bridge rectification load alternating current-direct current power-sensing circuit according to claim 1, it is characterized in that: the current sensing unit in described DC output end interface is in load circuit, be connected in series light emitting diode D, the light emission direction of light emitting diode D has photelectric receiver G, the voltage received by photelectric receiver G or current value obtain average anode current; Voltage sensor unit in DC output end interface carries out dividing potential drop by resistance R1 and R2, and the voltage on R2 exports and provides DC output end voltage, and in order to not affect the impact of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
5. a kind of full-bridge rectification load alternating current-direct current power-sensing circuit according to claim 1, it is characterized in that: the current sensing unit in described DC output end interface is series resistor R0 in load circuit, voltage is obtained by resistance R0, resistance R0 is measuring resistance, weighs and obtains average anode current; Voltage sensor unit in DC output end interface carries out dividing potential drop by resistance R1 and R2, and the voltage on R2 exports and provides DC output end voltage, and in order to not affect the impact of dividing potential drop on voltage detecting, the voltage on R2 is isolated by voltage follower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310613978.0A CN104635040A (en) | 2013-11-08 | 2013-11-08 | AC-DC power detection circuit of full-bridge rectifier load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310613978.0A CN104635040A (en) | 2013-11-08 | 2013-11-08 | AC-DC power detection circuit of full-bridge rectifier load |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310550428.9A Division CN104635037A (en) | 2013-11-08 | 2013-11-08 | High-precision detection circuit for full-bridge rectification load power and alternating current power |
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| Publication Number | Publication Date |
|---|---|
| CN104635040A true CN104635040A (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310613978.0A Withdrawn CN104635040A (en) | 2013-11-08 | 2013-11-08 | AC-DC power detection circuit of full-bridge rectifier load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568295A (en) * | 2019-09-30 | 2019-12-13 | 珠海格力电器股份有限公司 | AC/DC load fault detection circuit and detection method thereof |
-
2013
- 2013-11-08 CN CN201310613978.0A patent/CN104635040A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568295A (en) * | 2019-09-30 | 2019-12-13 | 珠海格力电器股份有限公司 | AC/DC load fault detection circuit and detection method thereof |
| CN110568295B (en) * | 2019-09-30 | 2024-03-15 | 珠海格力电器股份有限公司 | AC/DC load fault detection circuit and detection method thereof |
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Application publication date: 20150520 |