CN102545577B - Power factor correction circuit, power supply and electronic equipment - Google Patents
Power factor correction circuit, power supply and electronic equipment Download PDFInfo
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- CN102545577B CN102545577B CN201010602330.XA CN201010602330A CN102545577B CN 102545577 B CN102545577 B CN 102545577B CN 201010602330 A CN201010602330 A CN 201010602330A CN 102545577 B CN102545577 B CN 102545577B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention is applicable to the field of circuits and provides a power factor correction circuit, a power factor correction device and electronic equipment. The power factor correction circuit comprises a rectifying unit, a step-up unit, a feedback unit, a management control unit and an input voltage follow-up control unit. The input voltage follow-up control unit is arranged in the conventional power factor correction circuit, so that voltage output by the power factor correction circuit can change with the input voltage; and therefore, the working efficiency of the whole power factor correction circuit is improved.
Description
Technical field
The invention belongs to circuit field, particularly relate to a kind of circuit of power factor correction, power supply and electronic equipment.
Background technology
Circuit of power factor correction is more and more applied in various electronic equipment for general, and Fig. 1 is the fundamental diagram of existing a kind of circuit of power factor correction.Wherein, rectification unit 11 is to after the ac voltage rectifier of input, to be boosted the voltage after rectification unit 11 rectification by boosting unit 12, feedback unit 13 is according to the output of boosting unit 12, to management control unit 14 output feedack information, that is, with fixing resistance biased sample, to control boosting unit 12, the voltage of output is made to be a changeless value.The circuit structure diagram of this circuit of power factor correction as shown in Figure 2.In detail in this figure, the loss of the turn-on and turn-off of metal-oxide-semiconductor Q1 is comparatively large, and conversion efficiency need to improve.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of circuit of power factor correction, is intended to the operating efficiency improving existing power factor correction circuit.
The embodiment of the present invention is achieved in that a kind of circuit of power factor correction, comprising:
Rectification unit, boosting unit, feedback unit, management control unit and following by inputting voltages control unit;
Wherein, described rectification unit, for carrying out rectification to the alternating voltage of input;
Described boosting unit, for exporting after the boost in voltage after described rectification unit rectification, and the voltage exported according to described management control unit and export corresponding voltage, to realize voltage compensation;
Described following by inputting voltages control unit, for when input voltage is increased to threshold value, to described feedback unit output voltage, when input voltage reduces, reduces or stops to described feedback unit output voltage;
Described feedback unit, for when described following by inputting voltages control unit is to described feedback unit output voltage, reduces the feedback pin voltage of described management control unit; Or when described following by inputting voltages control unit reduces or stop the voltage exporting to described feedback unit, improve the feedback pin voltage of described management control unit;
Described feedback unit also for when the output voltage of described boosting unit raises, improves the feedback pin voltage of described management control unit; Or when the voltage that described boosting unit exports reduces, reduce the feedback pin voltage of described management control unit;
Described management control unit, for feeding back pin voltage according to it, export corresponding voltage to described boosting unit, the voltage that described boosting unit is exported according to described management control unit carries out voltage compensation.
Another object of the embodiment of the present invention is to provide a kind of power supply comprising circuit of power factor correction, and described circuit of power factor correction comprises:
Rectification unit, boosting unit, feedback unit, management control unit and following by inputting voltages control unit;
Wherein, described rectification unit, for carrying out rectification to the alternating voltage of input;
Described boosting unit, for exporting after the boost in voltage after described rectification unit rectification, and the voltage exported according to described management control unit and export corresponding voltage, to realize voltage compensation;
Described following by inputting voltages control unit, for when input voltage is increased to threshold value, to described feedback unit output voltage, when input voltage reduces, reduces or stops to described feedback unit output voltage;
Described feedback unit, for when described following by inputting voltages control unit is to described feedback unit output voltage, reduces the feedback pin voltage of described management control unit; Or when described following by inputting voltages control unit reduces or stop the voltage exporting to described feedback unit, improve the feedback pin voltage of described management control unit;
Described feedback unit also for when the output voltage of described boosting unit raises, improves the feedback pin voltage of described management control unit; Or when the voltage that described boosting unit exports reduces, reduce the feedback pin voltage of described management control unit;
Described management control unit, for feeding back pin voltage according to it, export corresponding voltage to described boosting unit, the voltage that described boosting unit is exported according to described management control unit carries out voltage compensation.
Another object of the embodiment of the present invention is to provide a kind of electronic equipment, and the power supply of described electronic equipment comprises power factor correction circuit, and described circuit of power factor correction comprises:
Rectification unit, boosting unit, feedback unit, management control unit and following by inputting voltages control unit;
Wherein, described rectification unit, for carrying out rectification to the alternating voltage of input;
Described boosting unit, for exporting after the boost in voltage after described rectification unit rectification, and the voltage exported according to described management control unit and export corresponding voltage, to realize voltage compensation;
Described following by inputting voltages control unit, for when input voltage is increased to threshold value, to described feedback unit output voltage, when input voltage reduces, reduces or stops to described feedback unit output voltage;
Described feedback unit, for when described following by inputting voltages control unit is to described feedback unit output voltage, reduces the feedback pin voltage of described management control unit; Or when described following by inputting voltages control unit reduces or stop the voltage exporting to described feedback unit, improve the feedback pin voltage of described management control unit;
Described feedback unit also for when the output voltage of described boosting unit raises, improves the feedback pin voltage of described management control unit; Or when the voltage that described boosting unit exports reduces, reduce the feedback pin voltage of described management control unit;
Described management control unit, for feeding back pin voltage according to it, export corresponding voltage to described boosting unit, the voltage that described boosting unit is exported according to described management control unit carries out voltage compensation.
The embodiment of the present invention, by adding following by inputting voltages control unit in existing circuit of power factor correction, improves the operating efficiency of existing circuit of power factor correction.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of existing circuit of power factor correction;
Fig. 2 is the circuit structure diagram of existing circuit of power factor correction;
Fig. 3 is the fundamental diagram of the circuit of power factor correction that first embodiment of the invention provides;
Fig. 4 is the circuit structure diagram of the circuit of power factor correction that first embodiment of the invention provides;
Fig. 5 is the fundamental diagram of the circuit of power factor correction that second embodiment of the invention provides;
Fig. 6 is the circuit structure diagram of the circuit of power factor correction that second embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention, by adding following by inputting voltages control unit in existing circuit of power factor correction, improves the operating efficiency of existing circuit of power factor correction.
The embodiment of the present invention is achieved in that a kind of circuit of power factor correction, comprising:
Rectification unit, boosting unit, feedback unit, management control unit and following by inputting voltages control unit;
Wherein, described rectification unit, for carrying out rectification to the alternating voltage of input;
Described boosting unit, for exporting after the boost in voltage after described rectification unit rectification, and the voltage exported according to described management control unit and export corresponding voltage, to realize voltage compensation;
Described following by inputting voltages control unit, for when input voltage is increased to threshold value, to described feedback unit output voltage, when input voltage reduces, reduces or stops to described feedback unit output voltage;
Described feedback unit, for when described following by inputting voltages control unit is to described feedback unit output voltage, reduces the feedback pin voltage of described management control unit; Or when described following by inputting voltages control unit reduces or stop the voltage exporting to described feedback unit, improve the feedback pin voltage of described management control unit;
Described feedback unit also for when the output voltage of described boosting unit raises, improves the feedback pin voltage of described management control unit; Or when the voltage that described boosting unit exports reduces, reduce the feedback pin voltage of described management control unit;
Described management control unit, for feeding back pin voltage according to it, export corresponding voltage to described boosting unit, the voltage that described boosting unit is exported according to described management control unit carries out voltage compensation.
The embodiment of the present invention is owing to adding following by inputting voltages control unit, and the voltage that circuit of power factor correction is exported follows change along with the change of the voltage of input, thus the operating efficiency of circuit of power factor correction entirety is improved.
embodiment one:
Fig. 3 shows the operation principle of the circuit of power factor correction that first embodiment of the invention provides, and merely illustrates the part relevant to the embodiment of the present invention for convenience of explanation.
Wherein, rectification unit 11, for carrying out rectification to the alternating voltage of input;
Boosting unit 12, for exporting after the boost in voltage after the rectification of described rectification unit 11, and according to management control unit 14 export voltage and export corresponding voltage, to realize voltage compensation;
Following by inputting voltages control unit 21, for when input voltage arrives threshold value, to feedback unit 13 output voltage, when input voltage reduces, reduces or stops to feedback unit 13 output voltage;
Feedback unit 13, for when following by inputting voltages control unit 21 is to described feedback unit 13 output voltage, reduces the feedback pin voltage of described management control unit 14; Or when following by inputting voltages control unit 21 reduces or stop the voltage exporting to feedback unit 13, improve the feedback pin voltage of management control unit 14;
Feedback unit 13 also for when the output voltage of boosting unit 12 raises, improves the feedback pin voltage of management control unit 14; Or when the voltage that boosting unit 12 exports reduces, reduce the feedback pin voltage of management control unit 14;
Management control unit 14, for feeding back pin voltage according to it, export corresponding voltage to boosting unit 12, the voltage that boosting unit 12 is exported according to management control unit 14 carries out voltage compensation.
In real work, following by inputting voltages control unit 21 is when input voltage arrives threshold value, to feedback unit 13 output voltage, and feedback unit 13 is when boosting unit 12 output end voltage raises, or when following by inputting voltages unit 21 is to its input voltage, reduce the feedback pin voltage of management control unit 14, because the feedback pin voltage of management control unit 14 reduces, boosting unit 12 is in order to compensate management control unit 14, so the voltage that boosting unit 12 exports also raises accordingly, thus the voltage enabling circuit of power factor correction export follows change according to the change of input voltage.
The embodiment of the present invention by adding following by inputting voltages control unit in existing circuit of power factor correction, the voltage that circuit of power factor correction is exported follows change along with the change of the voltage of input, thus the operating efficiency of circuit of power factor correction entirety is improved.
embodiment two:
Fig. 4 shows the circuit structure of the circuit of power factor correction that first embodiment of the invention provides, and merely illustrates the part relevant to the embodiment of the present invention for convenience of explanation.
Rectification unit 11 is made up of rectifier bridge BD1;
Boosting unit 12, by inductance L 1, switch Q1, diode D2 and electric capacity C2 form;
Wherein, inductance L 1 one end is connected with rectification unit, and the other end is connected with the positive pole of diode D2;
The negative pole of diode D2 is connected with voltage output end;
One end of electric capacity C2 is connected with the negative pole of diode D2, and the other end is jointly held with the source electrode of metal-oxide-semiconductor Q1 and is connected with management control unit;
The grid of metal-oxide-semiconductor Q1 is connected with management control unit, and drain electrode is connected with the positive pole of diode D2.
Feedback unit 13, forms primarily of resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, electric capacity C9.Wherein, jointly hold ground connection or connect equipotential for one of resistance R22 and electric capacity C9, another is held jointly successively by being connected with voltage output end after resistance R23, resistance R24, resistance R25, resistance R26.
Management control unit 14, primarily of control chip IC1 and IC peripheral component composition.
Following by inputting voltages control unit 21 comprises diode D5, diode D6, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C11 and switch S 1;
Switch S 1 can be metal-oxide-semiconductor can be also NPN type triode, and when switch S 1 is metal-oxide-semiconductor Q4, the input of switch S 1 is the source electrode of metal-oxide-semiconductor Q4, and the output of switch S 1 is the drain electrode of metal-oxide-semiconductor Q4, and the control end of switch S 1 is the grid of metal-oxide-semiconductor Q4;
When switch S 1 is NPN type triode T1, the input of switch S 1 is the emitter of NPN type triode T1, and the output of switch S 1 is the collector electrode of NPN type triode T1, and the control end of switch S 1 is the base stage of NPN type triode T1.In the present embodiment, the situation being metal-oxide-semiconductor Q4 with switch S 1 is described.
Particularly, the positive pole of diode D5 is connected with the negative pole of AC power, and the negative pole of diode D5 is successively by ground connection after resistance R28, resistance R29, resistance R30, resistance R31, resistance R32 or connect equipotential;
Diode D6 positive pole is connected with the positive pole of AC power, and negative pole is connected with the negative pole of diode D5;
Electric capacity C11 one end is connected with the grid of metal-oxide-semiconductor Q4, the common end ground connection of the source electrode of the other end and metal-oxide-semiconductor Q4 or connect equipotential;
The drain electrode of metal-oxide-semiconductor Q4 is connected with feedback unit.
In real work, from the alternating voltage of input by after diode D5, diode D6 rectification, through resistance R28, resistance R29, resistance R30, resistance R31, resistance R32 dividing potential drop by after electric capacity C11 filtering, obtain a stable voltage at A point.Adjusting the parameter of above-mentioned resistance, when setting input voltage value, the undertension of A point being worked to trigger metal-oxide-semiconductor Q4.
When input voltage raises, the voltage of A point also increases.When being raised to certain value, A point voltage reaches the evoked potential of the grid of metal-oxide-semiconductor Q4, metal-oxide-semiconductor Q4 conducting.After conducting, the voltage drop of the output voltage feedback pin of control chip IC1, causes this chip controls boosting unit 12 to improve output voltage.
When input voltage reduces, the voltage of A point also reduces thereupon, and when dropping to certain value, reach the pass power down bit of the grid of metal-oxide-semiconductor Q4, metal-oxide-semiconductor Q4 ends.After cut-off, the voltage rise of the output voltage feedback pin of control chip IC1, causes this chip controls boosting unit 12 to reduce output voltage.Thus realize the function that output voltage follows input voltage.
The embodiment of the present invention by adding following by inputting voltages control unit in existing circuit of power factor correction, the voltage that circuit of power factor correction is exported follows change along with the change of the voltage of input, thus the operating efficiency of circuit of power factor correction entirety is improved.
embodiment three:
Fig. 5 shows the operation principle of the circuit of power factor correction that second embodiment of the invention provides, and merely illustrates the part relevant to the embodiment of the present invention for convenience of explanation.
The circuit of power factor correction that second embodiment of the invention provides is on the basis of the circuit of power factor correction provided in first embodiment of the invention, add power output model-following control unit 31, for when power output reaches threshold value, to feedback unit 13 output voltage, when power output reduces, reduce or stop to feedback unit 13 output voltage.
In real work, power output model-following control unit 31 is when the power exported arrives threshold value, to feedback unit 13 output voltage, and feedback unit 13 at following by inputting voltages unit 21 to its input voltage, or when power output model-following control unit 31 is to its input voltage, reduce the feedback pin voltage of management control unit 14, because the feedback pin voltage of management control unit 14 reduces, boosting unit 12 is in order to compensate management control unit 14, so the voltage that boosting unit 12 exports also raises accordingly, thus the voltage enabling circuit of power factor correction export follows change according to the change of power output.
Feedback unit 13 also for when the output voltage of boosting unit 12 raises, improves the feedback pin voltage of management control unit 14; Or when the voltage that boosting unit 12 exports reduces, reduce the feedback pin voltage of management control unit 14; The embodiment of the present invention by adding power output model-following control unit in circuit of power factor correction, the voltage that circuit of power factor correction is exported follows change along with the change of the power exported, thus the operating efficiency of circuit of power factor correction entirety is improved.
embodiment four:
Fig. 6 shows the circuit structure of the circuit of power factor correction that second embodiment of the invention provides, and merely illustrates the part relevant to the embodiment of the present invention for convenience of explanation.
The circuit structure of the circuit of power factor correction that second embodiment of the invention provides, be the circuit of power factor correction provided in first embodiment of the invention circuit structure on add diode D12, resistance R51, resistance R52, the resistance R53, electric capacity C10 and the switch S 2 that form power output model-following control unit 31.
Switch S 2 can be metal-oxide-semiconductor can be also NPN type triode, and when switch S 2 is metal-oxide-semiconductor Q5, the input of switch S 2 is the source electrode of metal-oxide-semiconductor Q5, and the output of switch S 2 is the drain electrode of metal-oxide-semiconductor Q5, and the control end of switch S 2 is the grid of metal-oxide-semiconductor Q5.
When switch S 2 is NPN type triode T2, the input of switch S 2 is the emitter of NPN type triode T2, and the output of switch S 2 is the collector electrode of NPN type triode T2, and the control end of switch S 2 is the base stage of NPN type triode T2.In the present embodiment, the situation being metal-oxide-semiconductor Q5 with switch S 2 is described.
Particularly, the positive pole of diode D12 is connected with boosting unit, the negative pole of diode D12 is successively by ground connection after resistance R51, resistance R52, resistance R53 or connect equipotential;
Electric capacity C10 one end is connected with the grid of metal-oxide-semiconductor Q5, the common end ground connection of the source electrode of the other end and metal-oxide-semiconductor Q5 or connect equipotential;
The drain electrode of metal-oxide-semiconductor Q5 is connected with feedback unit.
In real work, the voltage responded to from the L1-B winding of L1 inductance by after diode D12 rectification, through resistance R51, resistance R52, resistance R53 dividing potential drop, and obtain a stable voltage at the grid of metal-oxide-semiconductor Q5 by after electric capacity C10 filtering.Adjust the parameter of above-mentioned resistance, when the power output set, make the current potential of the grid of MOS shop Q5 be not enough to trigger metal-oxide-semiconductor Q5 work, metal-oxide-semiconductor Q5 is in cut-off state.
When power output increases, after the voltage responded to from the L1-B coil L1 also increases thereupon, through resistance R51, resistance R52, resistance R53 dividing potential drop, and by the grid to metal-oxide-semiconductor Q5 after electric capacity C10 filtering, the voltage of the grid of metal-oxide-semiconductor Q5 also rises thereupon, when voltage appreciation reaches the evoked potential of the grid of metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 conducting.After conducting, the voltage drop of the output voltage feedback pin of control chip IC1, causes this chip controls boosting unit 12 to improve the voltage exported.
When power output reduces, the voltage responded to from the L1-B coil L1 also reduces thereupon, and the voltage of the grid of metal-oxide-semiconductor Q5 also declines thereupon, and when voltage drop value reaches the pass power down bit of the grid of metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 ends.After cut-off, the voltage rise of the output voltage feedback pin of control chip IC1, reduces and causes this chip controls boosting unit 12 to reduce the voltage exported, thus realize the function that output voltage follows power output.
The embodiment of the present invention can be realized by following example:
Select chip design circuit of a CCM control model, the alternating current of its input is 100V-240V, and power output is 400W, and the voltage required when 100% load exports reaches 380V.20% load efficiency of the circuit that test available circuit and this example provide when inputting 115V.The latter's regulating parameter voltage when output 20% load can be transferred to 320V.380V is followed during 100% load.Comparing result is as following table:
The principle of work is: output voltage is when reduction, the duty ratio of metal-oxide-semiconductor switch just can reduce, the peak current of metal-oxide-semiconductor reduces, thus reduce the turn-on and turn-off loss of metal-oxide-semiconductor, so efficiency can increase than non-framework of following, the main turn-on and turn-off loss exactly in order to reduce power device after applying this function.And when output is fully loaded, detection power output is followed unit and started action, voltage follow is to 380V.
The embodiment of the present invention by adding power output model-following control unit in circuit of power factor correction, the voltage that circuit of power factor correction is exported follows change along with the change of the power exported, thus the operating efficiency of circuit of power factor correction entirety is improved.
embodiment five
The circuit of power factor correction that the embodiment of the present invention provides may be used for using the power supply of circuit of power factor correction and use to comprise the various electronic equipments of the power supply of above-mentioned circuit of power factor correction.
The embodiment of the present invention adds following by inputting voltages control unit and power output model-following control unit in existing circuit of power factor correction, the voltage that circuit of power factor correction is exported changes along with the change of the voltage of input and the power of output, thus the operating efficiency of circuit of power factor correction entirety is improved.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a circuit of power factor correction, is characterized in that, described circuit comprises:
Rectification unit, boosting unit, feedback unit, management control unit, power output model-following control unit and following by inputting voltages control unit;
Wherein, described rectification unit, for carrying out rectification to the alternating voltage of input;
Described boosting unit, for exporting after the boost in voltage after described rectification unit rectification, and the voltage exported according to described management control unit and export corresponding voltage, to realize voltage compensation;
Described following by inputting voltages control unit, for when input voltage is increased to threshold value, to described feedback unit output voltage, when input voltage reduces, reduces or stops to described feedback unit output voltage;
Described feedback unit, for when described following by inputting voltages control unit is to described feedback unit output voltage, reduces the feedback pin voltage of described management control unit; Or when described following by inputting voltages control unit reduces or stop the voltage exporting to described feedback unit, improve the feedback pin voltage of described management control unit;
Described feedback unit also for when the output voltage of described boosting unit raises, improves the feedback pin voltage of described management control unit; Or when the voltage that described boosting unit exports reduces, reduce the feedback pin voltage of described management control unit;
Described management control unit, for feeding back pin voltage according to it, export corresponding voltage to described boosting unit, the voltage that described boosting unit is exported according to described management control unit carries out voltage compensation;
Described power output model-following control unit, for when power output reaches threshold value, to described feedback unit output voltage, when power output reduces, reduces or stops to described feedback unit output voltage;
Described power output model-following control unit comprises diode D12, resistance R51, resistance R52, resistance R53, electric capacity C10 and switch S 2;
Wherein, the positive pole of described diode D12 is connected with boosting unit, the negative pole of described diode D12 is successively by ground connection after described resistance R51, resistance R52, resistance R53 or connect equipotential;
Described electric capacity C10 one end is connected with the control end of described switch S 2, the common end ground connection of the input of the other end and described switch S 2 or connect equipotential;
The output of described switch S 2 is connected with described feedback unit;
Described switch S 2 is metal-oxide-semiconductor Q5 or NPN type triode;
Described boosting unit comprises: inductance L 1, metal-oxide-semiconductor Q1, diode D2 and electric capacity C2;
Voltage induced relation is there is between the L1-A coil of described inductance L 1 and L1-B coil;
Wherein, described inductance L 1 one end is connected with described rectification unit, and the other end is connected with the positive pole of described diode D2;
The negative pole of described diode D2 is connected with voltage output end;
One end of described electric capacity C2 is connected with the negative pole of described diode D2, and the other end is jointly held with the source electrode of described metal-oxide-semiconductor Q1 and is connected with described management control unit;
The grid of described metal-oxide-semiconductor Q1 is connected with described management control unit, and drain electrode is connected with the positive pole of described diode D2;
When power output increases, the voltage of the L1-A coil of described inductance L 1 increases, after the voltage that L1-B coil in inductance L 1 is responded to also is increased thereupon, through resistance R51, resistance R52, resistance R53 dividing potential drop, and by the grid to metal-oxide-semiconductor Q5 after electric capacity C10 filtering, the voltage of the grid of metal-oxide-semiconductor Q5 also rises thereupon, when voltage appreciation reaches the evoked potential of the grid of metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 conducting, the voltage drop of the output voltage feedback pin of control chip, causes this chip controls boosting unit to improve the voltage exported;
When power output reduces, the voltage of the L1-A coil of described inductance L 1 reduces, the voltage that L1-B coil in inductance L 1 is responded to also is reduced thereupon, the voltage of the grid of metal-oxide-semiconductor Q5 also declines thereupon, when voltage drop value reaches the pass power down bit of the grid of metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q5 ends, the voltage rise of the output voltage feedback pin of control chip, reduce and cause this chip controls boosting unit to reduce the voltage exported, thus realize the function that output voltage follows power output.
2. circuit of power factor correction as claimed in claim 1, it is characterized in that, described following by inputting voltages control unit comprises: diode D5, diode D6, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C11 and switch S 1;
Wherein, the described positive pole of diode D5 is connected with the negative pole of AC power, and the negative pole of described diode D5 is successively by ground connection after described resistance R28, resistance R29, resistance R30, resistance R31, resistance R32 or connect equipotential;
Described diode D6 positive pole is connected with the positive pole of AC power, and negative pole is connected with the negative pole of described diode D5;
Described electric capacity C11 one end is connected with the control end of described driving switch S1, the common end ground connection of the input of the other end and described switch S 1 or connect equipotential;
The output of described switch S 1 is connected with described feedback unit.
3. circuit of power factor correction as claimed in claim 2, it is characterized in that, described driving switch S1 is metal-oxide-semiconductor or NPN type triode;
When described switch S 1 is metal-oxide-semiconductor Q4, the input of described switch S 1 is the source electrode of metal-oxide-semiconductor Q4, and the output of described switch S 1 is the drain electrode of metal-oxide-semiconductor Q4, and the control end of described switch S 1 is the grid of metal-oxide-semiconductor Q4;
When described switch S 1 is NPN type triode T1, the input of described switch S 1 is the emitter of NPN type triode T1, and the output of described switch S 1 is the collector electrode of NPN type triode T1, and the control end of described switch S 1 is the base stage of NPN type triode T1.
4. circuit of power factor correction as claimed in claim 1, it is characterized in that, when described switch S 2 is metal-oxide-semiconductor Q5, the input of described switch S 2 is the source electrode of metal-oxide-semiconductor Q5, the output of described switch S 2 is the drain electrode of metal-oxide-semiconductor Q5, and the control end of described switch S 2 is the grid of metal-oxide-semiconductor Q5;
When described switch S 2 is NPN type triode T2, the input of described switch S 2 is the emitter of NPN type triode T2, and the output of described switch S 2 is the collector electrode of NPN type triode T2, and the control end of described switch S 2 is the base stage of NPN type triode T2.
5. circuit of power factor correction as claimed in claim 1, it is characterized in that, described feedback unit comprises: resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, electric capacity C9;
Wherein, jointly hold ground connection or connect equipotential for one of described resistance R22 and described electric capacity C9, another is held jointly successively by being connected with voltage output end after described resistance R23, resistance R24, resistance R25, resistance R26.
6. one kind comprises the power supply of the circuit of power factor correction as described in any one of claim 1 to 5.
7. one kind comprises the electronic equipment of the circuit of power factor correction as described in any one of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010602330.XA CN102545577B (en) | 2010-12-23 | 2010-12-23 | Power factor correction circuit, power supply and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010602330.XA CN102545577B (en) | 2010-12-23 | 2010-12-23 | Power factor correction circuit, power supply and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN102545577A CN102545577A (en) | 2012-07-04 |
| CN102545577B true CN102545577B (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010602330.XA Expired - Fee Related CN102545577B (en) | 2010-12-23 | 2010-12-23 | Power factor correction circuit, power supply and electronic equipment |
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| Country | Link |
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| CN (1) | CN102545577B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115733374A (en) * | 2021-08-26 | 2023-03-03 | Oppo广东移动通信有限公司 | Power adjustment circuit, method, device and related products |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003324959A (en) * | 2002-04-26 | 2003-11-14 | Nichicon Corp | Switching power supply |
| JP2004166440A (en) * | 2002-11-15 | 2004-06-10 | Cosel Co Ltd | Switching power supply |
| JP2009513094A (en) * | 2005-10-28 | 2009-03-26 | エヌエックスピー ビー ヴィ | Power factor correction boost circuit |
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2010
- 2010-12-23 CN CN201010602330.XA patent/CN102545577B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN102545577A (en) | 2012-07-04 |
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Address after: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: CHINA GREAT WALL TECHNOLOGY GROUP Co.,Ltd. Address before: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: CHINA GREATWALL COMPUTER SHENZHEN Co.,Ltd. |
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