CN1889002A - Voltage switching circuit and power factor correcting circuit with the same circuit - Google Patents
Voltage switching circuit and power factor correcting circuit with the same circuit Download PDFInfo
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- CN1889002A CN1889002A CN 200510102258 CN200510102258A CN1889002A CN 1889002 A CN1889002 A CN 1889002A CN 200510102258 CN200510102258 CN 200510102258 CN 200510102258 A CN200510102258 A CN 200510102258A CN 1889002 A CN1889002 A CN 1889002A
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Abstract
The invention relates to a voltage commutation circuit which includes the alternating voltage sample circuit, the alternating voltage detection circuit which the output end is connected to the commutation steering circuit which is all connected to the output end of the AC sample circuit. The invention also relates to a correcting circuit for the power factor which can work in the different steps of the output voltage because the voltage commutation circuit is used in the correcting circuit for the power factor. When the AC input voltage is low, the correcting circuit for the power factor is changed to another step automatically, so the power factor and the efficient are all improved compared to the traditional circuit. Then it can decrease the pollution to the electric network and save the energy.
Description
Technical field
The present invention relates to circuit of power factor correction, relate in particular to a kind of voltage commutation circuit and adopt the circuit of power factor correction of this circuit.
Background technology
Traditional diode rectifier that is used for the electronic equipment front end as a harmonic current source, disturbs grid line voltage, produce to around radiation and along the electromagnetic interference (EMI) of wire spread, cause the utilization ratio of power supply to descend.In recent years, in order to meet the harmonic wave criterion of the 61000-3-2 of International Electrotechnical Commission, circuit of power factor correction just more and more attracted much attention.Power factor correction technology develops into present active circuit from early stage passive electric circuit; Develop into nonlinear control method from traditional linear control method, new topological sum technology continues to bring out.
Circuit of power factor correction is divided into active and passive two classes.Passive correcting circuit is made up of jumbo inductance, electric capacity usually.Though the power factor that passive power factor correcting circuit obtains is not so good as the APFC height, but still can make power factor bring up to 0.7～0.8, thereby is widely adopted in the middle low power power supply.APFC has obtained rapid popularization since the nineties in last century.APFC is to add a power conversion circuit between bridge rectifier and output capacitance wave filter, makes power factor near 1.APFC works in the HF switch state, and volume is little, in light weight, than passive power factor correcting circuit efficient height.
Traditional APFC has only the output of gear voltage, crosses when low when AC-input voltage, and the output voltage of APFC can reduce, so power factor and efficient all can reduce.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of circuit of power factor correction that makes the voltage commutation circuit of circuit of power factor correction is operated in different gears with the height of AC-input voltage output voltage and adopt this circuit.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of voltage commutation circuit is provided, it comprises alternating voltage sample circuit, the ac voltage detection circuit and the control switching circuit that are connected with the output terminal of this alternating voltage sample circuit respectively, and the output terminal of this ac voltage detection circuit also is connected with this control switching circuit.
Further improvement in the technical proposal is: this alternating voltage sample circuit comprises diode D02, connect with this diode D02 and the capacitor C 01 of ground connection, at least two sample resistances of connecting with this diode D02, a sample resistance R06 ground connection wherein, another sample resistance is connected with capacitor C 02, this capacitor C 02 ground connection.
Described another sample resistance comprises sample resistance R02, R03, R04 and R05.
This ac voltage detection circuit comprises adjustable shunting reference source, the plus earth of shunting reference source that this is adjustable, and its reference edge is connected the sampling voltage output terminal of sample resistance R06.
Described control switching circuit comprises PNP triode Q02, the sampling voltage output terminal of the emitter of described PNP triode Q02 on the sample resistance R06 of resistance and alternating voltage sample circuit is connected, the collector of PNP triode Q02 connects DC voltage, go back series resistor R07 between the collector of PNP triode Q02 and the base stage, the resistance R 10 of connecting between the base stage of PNP triode Q02 and the negative electrode of this adjustable shunting reference source, described control switching circuit also comprises NPN triode Q01, its grounded emitter, its base stage is by resistance R 12 ground connection, and its base stage is being connected of the emitter by resistance R 11 and PNP triode Q02 also.
For solving above-mentioned another technical matters, the technical solution adopted in the present invention is: a kind of circuit of power factor correction is provided, it comprises the filtering circuit that connects successively, first rectification circuit, inductance, metal-oxide-semiconductor, second rectification circuit and electrochemical capacitor, this circuit of power factor correction also comprises feedback circuit, pfc controller and voltage commutation circuit, this pfc controller is connected on the input end of metal-oxide-semiconductor, this feedback circuit is connected on the output terminal of electrochemical capacitor respectively, the input end of pfc controller and the output terminal of voltage commutation circuit, the input end of this voltage commutation circuit is connected on the output terminal of filtering circuit, the input termination of filtering circuit be AC power, this voltage commutation circuit comprises the alternating voltage sample circuit, ac voltage detection circuit and the control switching circuit that is connected with the output terminal of this alternating voltage sample circuit respectively, the output terminal of this ac voltage detection circuit also is connected with this control switching circuit.
The invention has the beneficial effects as follows: because circuit of power factor correction of the present invention adopts voltage commutation circuit, pfc circuit is operated in the output voltage of different gears with the height of alternating current input, when PFC when AC-input voltage is low automatically switches to another shelves, under this condition, compare with traditional pfc circuit, power factor and efficient all increase, and reduce the pollution of electrical network and have saved electric energy.
Description of drawings
Fig. 1 is the functional block diagram of circuit of power factor correction of the present invention.
Fig. 2 is the functional block diagram of voltage commutation circuit shown in Figure 1.
Fig. 3 is the circuit theory diagrams of first embodiment of voltage commutation circuit shown in Figure 2.
Embodiment
See also Fig. 1, circuit of power factor correction of the present invention comprises the filtering circuit 1 that connects successively, first rectification circuit 2, inductance 3, metal-oxide-semiconductor 4, second rectification circuit 5 and electrochemical capacitor 6, this circuit of power factor correction also comprises feedback circuit 7, PFC (power factor correction) controller 8 and voltage commutation circuit 9, this pfc controller 8 is connected on the input end of metal-oxide-semiconductor 4, feedback circuit 7 is connected on the output terminal of electrochemical capacitor 6 respectively, the output terminal of the input end of pfc controller 8 and voltage commutation circuit 9, the input end of voltage commutation circuit 9 is connected on the output terminal of filtering circuit 1, the input termination of filtering circuit 1 be AC power.
Above-mentioned pfc controller 8 can be selected UC3854 for use usually, pfc controller 8 has the PFC output voltage and detects pin, this pin is connected with feedback circuit 7, then the voltage that detects is passed to pfc controller 8, if it is higher that pfc controller 8 detects voltage, then pfc controller 8 is exported to the pulse narrowing of metal-oxide-semiconductor 4, and metal-oxide-semiconductor 4 ON time shorten, PFC output voltage step-down; Otherwise on the low side if pfc controller 8 detects voltage, then pfc controller 8 pulse of exporting to metal-oxide-semiconductor 4 broadens, and metal-oxide-semiconductor 4 ON time are elongated, and the PFC output voltage uprises.By constantly adjusting the output voltage of circuit of power factor correction, make circuit of power factor correction output burning voltage.
See also Fig. 2, voltage commutation circuit of the present invention comprises alternating voltage sample circuit 91, the ac voltage detection circuit 92 and the control switching circuit 93 that are connected with the output terminal of this alternating voltage sample circuit 91 respectively, and the output terminal of this ac voltage detection circuit 92 also is connected with this control switching circuit 93.
See also Fig. 3, the alternating voltage sample circuit 91 of the voltage commutation circuit 9 of the specific embodiment of the invention comprises diode D02, connect and the capacitor C 01 of ground connection, sample resistance R02, the R03, R04, R05 and the R06 that connect with diode D02 and the also capacitor C 02 of ground connection of connecting with sample resistance R05 sample resistance R06 ground connection with diode D02; Described ac voltage detection circuit 92 comprises adjustable shunting reference source, and shunting reference source that this is adjustable is the TL431 chip, its plus earth, and its reference edge is connected the sampling voltage output terminal of sample resistance R06; Described control switching circuit 93 comprises PNP triode Q02, the emitter of described PNP triode Q02 is through resistance R 08, sampling voltage output terminal on the sample resistance R06 of R09 and alternating voltage sample circuit 91 is connected, the collector of PNP triode Q02 connects the 18V DC voltage, go back series resistor R07 between the collector of PNP triode Q02 and the base stage, the resistance R 10 of connecting between the base stage of PNP triode Q02 and the negative electrode of TL431, described control switching circuit 93 also comprises NPN triode Q01, its grounded emitter, its base stage is by resistance R 12 ground connection, and its base stage is being connected of the emitter by resistance R 11 and PNP triode Q02 also; Described feedback circuit 7 is made up of sample resistance R13, R14, R15 and the R16 of series connection, sample resistance R13 ground connection, sample resistance R16 is connected with the PFC output terminal, the collector of NPN triode Q01 is connected on the sampling voltage output terminal of sample resistance R13, and the PFC output voltage of pfc controller 8 detects the sampling voltage output terminal that pin is connected on sample resistance R14.
The resistance of sample resistance R02, R03, R04 and the R05 of the specific embodiment of the invention is 470K ohm, the resistance of sample resistance R06 is 20K ohm, the resistance of resistance R 07 is 2.2K ohm, the resistance of resistance R 08 and R09 is 270K ohm, the resistance of resistance R 10 and R11 is 10K ohm, and the resistance of resistance R 12 is 3.3K ohm.The value of capacitor C 01 is 3.3 μ/450V, and the value of capacitor C 02 is 10 μ/50V.The model 2SC1815 that NPN triode Q01 adopts, the model 2SA1015 that PNP triode Q02 adopts.The model that diode D02 adopts is 1N4007.
The principle of work of voltage commutation circuit of the present invention is: after the input AC electricity process diode D02 rectification, dividing potential drop by sample resistance R02, R03, R04, R05 and R06, the TL431 chip that sampling voltage on the sample resistance R06 is sent to ac voltage detection circuit 92 compares, sampling voltage on sample resistance R06 is higher than 2.48V, the reference voltage terminal that is TL431 is higher than 2.48V, then TL431 conducting; Otherwise TL431 ends; When the reference voltage terminal of TL431 is higher than 2.48V, simultaneously when the collector of PNP triode Q02 connects the 18V DC voltage, PNP triode Q02 conducting, NPN triode Q01 conducting then, NPN triode Q01 conducting is equivalent to the short circuit with sample resistance R13; When the reference voltage terminal of TL431 is lower than 2.48V, then PNP triode Q02 and NPN triode Q01 all end, sample resistance R13 operate as normal.The PFC output voltage depends on the voltage on sample resistance R13 and the R14 resistance in series, so as long as the R13 work of change sample resistance and idle state just can change the output voltage of PFC.The present invention mainly is by switching the resistance of sample resistance R13, and when commutation circuit was worked, sample resistance R13 was by short circuit, and feedback voltage just is the voltage on the R14; When commutation circuit was not worked, sample resistance R13 was normal resistance, feedback voltage be exactly on sample resistance R13 and the R14 voltage and, so the voltage of PFC output also has two grades.
In addition, sample resistance R02, R03, R04 and the R05 of voltage commutation circuit of the present invention can equivalence be a resistance also, and resistance R 08 and R09 can equivalence be a resistance also, and resistance R 15 and R16 can equivalence be a resistance also.
The present invention is mainly used in having on the power supply of circuit of power factor correction, circuit of power factor correction is with the height difference of AC power input voltage, (if AC-input voltage 85V～160V, then the PFC output voltage is 310V and be operated in the output voltage of different gears; AC-input voltage 160V～260V, then the PFC output voltage is 370V).
The selected device of the present invention is device commonly used, and is cheap, and control accuracy is than higher, and it can be applicable on the power supply of PDP and LCD display, but also can be used for the switching of other circuit.
Claims (10)
1, a kind of voltage commutation circuit, it is characterized in that: it comprises alternating voltage sample circuit, the ac voltage detection circuit and the control switching circuit that are connected with the output terminal of this alternating voltage sample circuit respectively, and the output terminal of this ac voltage detection circuit also is connected with this control switching circuit.
2. voltage commutation circuit as claimed in claim 1, it is characterized in that: this alternating voltage sample circuit comprises diode D02, connect with this diode D02 and the capacitor C 01 of ground connection, at least two sample resistances of connecting with this diode D02, a sample resistance R06 ground connection wherein, another sample resistance is connected with capacitor C 02, this capacitor C 02 ground connection.
3. voltage commutation circuit as claimed in claim 2 is characterized in that: described another sample resistance comprises sample resistance R02, R03, R04 and the R05 of series connection.
4. voltage commutation circuit as claimed in claim 2 is characterized in that: this ac voltage detection circuit comprises adjustable shunting reference source, the plus earth of shunting reference source that this is adjustable, and its reference edge is connected the sampling voltage output terminal of sample resistance R06.
5. voltage commutation circuit as claimed in claim 4, it is characterized in that: described control switching circuit comprises PNP triode Q02, the sampling voltage output terminal of the emitter of described PNP triode Q02 on the sample resistance R06 of resistance and alternating voltage sample circuit is connected, the collector of PNP triode Q02 connects DC voltage, go back series resistor R07 between the collector of PNP triode Q02 and the base stage, the resistance R 10 of connecting between the base stage of PNP triode Q02 and the negative electrode of this adjustable shunting reference source, described control switching circuit also comprises NPN triode Q01, its grounded emitter, its base stage is by resistance R 12 ground connection, and its base stage is being connected of the emitter by resistance R 11 and PNP triode Q02 also.
6. voltage commutation circuit as claimed in claim 5, it is characterized in that: the resistance that emitter described and PNP triode Q02 is connected comprises R08 and R09, the resistance of sample resistance R02, R03, R04 and R05 is 470K ohm, the resistance of sample resistance R06 is 20K ohm, the resistance of resistance R 07 is 2.2K ohm, the resistance of resistance R 08 and R09 is 270K ohm, the resistance of resistance R 10 and R11 is 10K ohm, the resistance of resistance R 12 is 3.3K ohm, the value of capacitor C 01 is 3.3 μ/450V, and the value of capacitor C 02 is 10 μ/50V.
7, a kind of circuit of power factor correction, it is characterized in that: it comprises the filtering circuit that connects successively, first rectification circuit, inductance, metal-oxide-semiconductor, second rectification circuit and electrochemical capacitor, this circuit of power factor correction also comprises feedback circuit, pfc controller and voltage commutation circuit, this pfc controller is connected on the input end of metal-oxide-semiconductor, this feedback circuit is connected on the output terminal of electrochemical capacitor respectively, the input end of pfc controller and the output terminal of voltage commutation circuit, the input end of this voltage commutation circuit is connected on the output terminal of filtering circuit, the input termination of filtering circuit be AC power, this voltage commutation circuit comprises the alternating voltage sample circuit, ac voltage detection circuit and the control switching circuit that is connected with the output terminal of this alternating voltage sample circuit respectively, the output terminal of this ac voltage detection circuit also is connected with this control switching circuit.
8. circuit of power factor correction as claimed in claim 7, it is characterized in that: this alternating voltage sample circuit comprises diode D02, connect and the capacitor C 01 of ground connection, sample resistance R02, the R03, R04, R05 and the R06 that connect with diode D02 and the also capacitor C 02 of ground connection of connecting with sample resistance R05 sample resistance R06 ground connection with this diode D02.
9. circuit of power factor correction as claimed in claim 8 is characterized in that: this ac voltage detection circuit comprises adjustable shunting reference source, the plus earth of shunting reference source that this is adjustable, and its reference edge is connected the sampling voltage output terminal of sample resistance R06.
10. circuit of power factor correction as claimed in claim 9, it is characterized in that: described control switching circuit comprises PNP triode Q02, the sampling voltage output terminal of the emitter of described PNP triode Q02 on the sample resistance R06 of resistance and alternating voltage sample circuit is connected, the collector of PNP triode Q02 connects DC voltage, go back series resistor R07 between the collector of PNP triode Q02 and the base stage, the resistance R 10 of connecting between the base stage of PNP triode Q02 and the negative electrode of this adjustable shunting reference source, described control switching circuit also comprises NPN triode Q01, its grounded emitter, its base stage is by resistance R 12 ground connection, its base stage is being connected of the emitter by resistance R 11 and PNP triode Q02 also, described feedback circuit is by the sample resistance R13 of series connection, R14, R15 and R16 form, sample resistance R13 ground connection, sample resistance R16 is connected with the PFC output terminal, the collector of NPN triode Q01 is connected on the sampling voltage output terminal of sample resistance R13, and the PFC output voltage of pfc controller detects the sampling voltage output terminal that pin is connected on sample resistance R14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101022583A CN100464274C (en) | 2005-12-07 | 2005-12-07 | Voltage switching circuit and power factor correcting circuit with the same circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101022583A CN100464274C (en) | 2005-12-07 | 2005-12-07 | Voltage switching circuit and power factor correcting circuit with the same circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1889002A true CN1889002A (en) | 2007-01-03 |
| CN100464274C CN100464274C (en) | 2009-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101022583A Expired - Fee Related CN100464274C (en) | 2005-12-07 | 2005-12-07 | Voltage switching circuit and power factor correcting circuit with the same circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3260024B2 (en) * | 1993-11-15 | 2002-02-25 | 株式会社東芝 | Power circuit |
| US5614810A (en) * | 1994-02-14 | 1997-03-25 | Magneteck, Inc. | Power factor correction circuit |
| CN1452806B (en) * | 2000-09-05 | 2010-05-26 | 美蓓亚株式会社 | Active power factor correction device and method therefor |
| CN1667931A (en) * | 2004-03-10 | 2005-09-14 | 全汉企业股份有限公司 | Power-supply switching system |
| CN2753056Y (en) * | 2004-12-03 | 2006-01-18 | 深圳市核达中远通电源技术有限公司 | Power factor correct circuit with sectional control function |
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2005
- 2005-12-07 CN CNB2005101022583A patent/CN100464274C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
| CN114924109B (en) * | 2022-07-20 | 2022-11-29 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
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| CN100464274C (en) | 2009-02-25 |
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