CN103023301A - Active power factor correction circuit - Google Patents
Active power factor correction circuit Download PDFInfo
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- CN103023301A CN103023301A CN2012105112038A CN201210511203A CN103023301A CN 103023301 A CN103023301 A CN 103023301A CN 2012105112038 A CN2012105112038 A CN 2012105112038A CN 201210511203 A CN201210511203 A CN 201210511203A CN 103023301 A CN103023301 A CN 103023301A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- 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 discloses an active power factor correction circuit which is mainly used for a light-emitting diode (LED) driving power source. The active power factor correction circuit comprises a power supply inductor L1, a power factor correction control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth output large capacitor C8, a power switch tube Q1 and a plug and play (PNP) triode Q2. The model of the power factor correction control chip U1 is NCP1653A. Under 220V input broadband, the power factor of the active power factor correction circuit can reach over 0.96, and the correction effect is remarkable.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly a kind of APFC is mainly used in the LED driving power.
Background technology
The power factor full name is Power Factor, is defined as the ratio of active power (P) and apparent power (S):
Wherein, γ is the input current abnormality factor, and numerical value is low to represent that then harmonic component is large, cause the current waveform distortion, electrical network is polluted, cos θ is fundamental voltage, current displacement factor, the too low reactive power that then represents of numerical value accounts for to get large percentage, and utilization rate of equipment and installations is low.
Power factor correction is a term that is used in the AC network, and it has reflected the phase relation of supply voltage and source current, and desirable power factor correction is to make alternating voltage and electric current same-phase (power factor is 1) and harmonic content lower.PFC utilizes PWM to adjust the size of input power, and when alternating voltage was higher, pfc circuit was just drawn more power from AC power; When alternating voltage was relatively lower, pfc circuit was just drawn less power from AC power.Like this can the amount of saving energy, avoid some problems that the 3rd order harmonics electric current causes in the building.Power factor correction technology generally is divided into PPFC (Passive Power Factor Correction) and Active Power Factor Correction, the both economical practicality of PPFC (Passive Power Factor Correction), but the effect of power factor correction is not as the effect of Active Power Factor Correction.
Along with the development of society, society constantly increases the requirement of electric power, and the operating voltage of most of power consumption equipment directly is taken from AC network.Because a lot of electronic equipments are nonlinear loads, electrical network can produce harmonic voltage and electric current, causes the pollution to AC network.Simultaneously, some does not have the plant capacity factor of power factor correction low, and the reactive power that AC network is provided increases greatly, has reduced the service efficiency of the energy.The high normal operation of disturbing easily other equipment of current harmonics.Therefore, improve power factor, the namely power factor correction of content that reduces harmonic wave becomes very important research direction in the field of switch power.
The conversion efficiency of LLC resonance converter is high, so use comparatively extensive.And the LLC resonance converter is can steady operation under the close limit surging condition of 380～400V at input voltage, and pfc circuit can satisfy this condition.And PFC can the amount of saving energy, and can reduce the harmonic wave of electric power system to the pollution of electrical network.Because APFC is higher than the efficient of passive power factor correcting circuit, volume is little.Although pfc circuit simple economy in the past, effect is bad, thus adopt APFC in a lot of situation, but APFC needs complicated control circuit.Can accomplish with discrete component in the past, but be subject to external influence, and be not easy to safeguard.The present invention adopts integrated chip control, can effectively reduce the impact of outer bound pair circuit, and because following feedback to output is arranged, can do real-time adjustment to output signal, and it is constant to make input voltage be in variation that output voltage still keeps.
The present invention is exactly the raising for technology in this field, the APFC that provides a kind of novel LED to drive.
Summary of the invention
The present invention is a kind of circuit that high pressure constant voltage signal is provided for the LLC controlled resonant converter, this circuit can be raised to line voltage the such arrowband fluctuation range of 380～400V, because the operating efficiency of LLC controlled resonant converter is higher in this scope, this circuit is finished power factor correction simultaneously.
The present invention includes power supply inductance L 1, Power Factor Correction Control chip U1, the first resistance R 1, the second resistance R 2, the three resistance R 3, the four resistance R 4, the 5th resistance R 5, the six resistance R 6, the seven resistance R 7, the 8th resistance R 8, the nine resistance R 9, the ten resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the first diode D1, the second diode D2, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the four capacitor C 4, the five capacitor C 5, the 6th capacitor C 6, the large capacitor C 8 of the 7th capacitor C 7, the eight outputs, power switch pipe Q1, positive-negative-positive triode Q2, described Power Factor Correction Control chip U1 model is NCP1653A.
The pin 1 of described Power Factor Correction Control chip U1 with by capacitor C 4 ground connection, and series resistance R3, R4, R5 link to each other with described circuit output end, resistance R 6 is connected in parallel with R3 afterwards with C1; The pin 2 of described Power Factor Correction Control chip U1 is by capacitor C 5 ground connection; The pin 3 of described Power Factor Correction Control chip U1 is by capacitor C 3 ground connection, and link to each other with R1, R2 simultaneously, one end of the output of the other end of R1 and prime rectification circuit and power supply inductance L 1 links to each other, the other end of R2 with link to each other C2 other end ground connection with capacitor C 2 one ends; The pin 4 of described Power Factor Correction Control chip U1 links to each other with an end of resistance R 7, and the other end of R7 links to each other the other end ground connection of resistance R 12 with the other end of prime rectification circuit and an end of resistance R 12 simultaneously; The pin 5 of described Power Factor Correction Control chip U1 links to each other the other end ground connection of capacitor C 7 and resistance R 9 with an end of capacitor C 7 and resistance R 9 respectively; Pin 6 ground connection of described Power Factor Correction Control chip U1; The pin 7 of described Power Factor Correction Control chip U1 links to each other with an end of resistance R 10; The pin 8 of described Power Factor Correction Control chip U1 links to each other with an end of resistance R 8 and capacitor C 6, another termination power supply VCC of resistance R 8, the other end ground connection of capacitor C 6.
The other end of described resistance R 10 links to each other with the positive pole of diode D1 and the base stage of positive-negative-positive triode respectively, and the other end of diode D2 links to each other with the emitter of described positive-negative-positive triode, an end of resistance R 11, the grid of power switch pipe Q2 respectively; The source ground of the other end of the collector electrode of positive-negative-positive triode and resistance R 11, power switch pipe Q2.
The other end of power supply inductance L 1 links to each other with the drain electrode of power switch pipe Q1, the positive pole of diode D2; The other end of diode D2 links to each other with the positive pole of the large capacitor C 8 of output, exports the other end ground connection of large capacitor C 8; Tie point and the resistance R 5 of diode D2 and the large capacitor C 8 of output is away from to be connected the end that Power Factor Correction Control chip U1 is connected continuous; Export large capacitor C 8 two ends as signal output part.
Through test, capability correction factor of the present invention can reach more than 0.96, and working stability is reliable.
Description of drawings
Fig. 1 is the circuit block diagram of a kind of APFC of the present invention.
Fig. 2 is the circuit diagram of a kind of APFC of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Operation principle of the present invention as shown in Figure 1, civil power is passed through by power MOSFET, turning on and off then of power MOSFET controlled by control chip, the ripple Acquisition Circuit is sent the ripple of civil power into control chip simultaneously, can control accurately duty ratio like this, and then the turning on and off of power ratio control MOSFET, thereby reach the purpose of power factor correction.
As shown in Figure 2, the present invention includes power supply inductance L 1, Power Factor Correction Control chip U1, the first resistance R 1, the second resistance R 2, the three resistance R 3, the 4th resistance R 4, the five resistance R 5, the six resistance R 6, the 7th resistance R 7, the eight resistance R 8, the nine resistance R 9, the tenth resistance R 10, the 11 resistance R 11, the 12 resistance R 12, the first diode D1, the second diode D2, the first capacitor C 1, the second capacitor C 2, the three capacitor C 3, the four capacitor C 4, the 5th capacitor C 5, the six capacitor C 6, the seven capacitor C 7, the large capacitor C 8 of the 8th output, power switch pipe Q1, positive-negative-positive triode Q2, described Power Factor Correction Control chip U1 model is NCP1653A.
The pin 1 of Power Factor Correction Control chip U1 with by capacitor C 4 ground connection, and series resistance R3, R4, R5 link to each other with circuit output end, resistance R 6 is connected in parallel with R3 afterwards with C1; The pin 2 of Power Factor Correction Control chip U1 is by capacitor C 5 ground connection; The pin 3 of Power Factor Correction Control chip U1 is by capacitor C 3 ground connection, and link to each other with R1, R2 simultaneously, one end of the output of the other end of R1 and prime rectification circuit and power supply inductance L 1 links to each other, the other end of R2 with link to each other C2 other end ground connection with capacitor C 2 one ends; The pin 4 of Power Factor Correction Control chip U1 links to each other with an end of resistance R 7, and the other end of R7 links to each other the other end ground connection of resistance R 12 with the other end of prime rectification circuit and an end of resistance R 12 simultaneously; The pin 5 of Power Factor Correction Control chip U1 links to each other the other end ground connection of capacitor C 7 and resistance R 9 with an end of capacitor C 7 and resistance R 9 respectively; Pin 6 ground connection of Power Factor Correction Control chip U1; The pin 7 of Power Factor Correction Control chip U1 links to each other with an end of resistance R 10; The pin 8 of Power Factor Correction Control chip U1 links to each other with an end of resistance R 8 and capacitor C 6, another termination power supply VCC of resistance R 8, the other end ground connection of capacitor C 6.
Among the figure, the peak inrush current of inductance L 1 is 4.02A, selects the copper cash of 0.3mm*4 thigh to come coiling, and effect is make the input current change level and smooth.The value of capacitor C 2 is 1nF, the radio-frequency component in can the filtering inductive current, and the bandwidth of the electric current of control inputs control chip pin 3, this bandwidth is controlled by the capacitor C 5 that the pin 2 of control chip connects, and when the value of C5 was 100nF, bandwidth was 50 or 60Hz.R2 and following capacitor C 2 form low pass filters, can effectively filtering AC ripple, and the current stabilization of retentive control chip pin 3, the resistance of R1, R2 are respectively 4.7M Ω and 470k Ω, and the value of C2 is 1nF.Pin 3 absorbs input voltage and input current I
In, I
InWith input voltage V
InMean-square value be directly proportional, the duty ratio adjustment by to PFC realizes the adjustment to power output.The input current I of the pin 4 of control chip
sWith inductive current I
LBe directly proportional, the resistance of resistance R 7 is 2.2k Ω.The switching harmonics of resistance R 9 is from inductive current I
L, can obtain accurate duty ratio, the resistance of R9 is 56k Ω, capacitor C 7 effects are HFSs of voltage on the filtering resistance R 9.Pin 6 ground connection of control chip, pin 8 connects supply power voltage, and voltage range is 8.75V～18V.The pin 7 of control chip provides the driving signal of outside MOSFET.
That power switch pipe uses is the STP20NM60FP that ST company produces, because this device grids electric charge is few, electric capacity is little and drain-source resistance R
DSLittle, can reduce switching loss and conduction loss.The fast diode STTH8L06FP of the ST company that rectifier diode D2 then selects, the forward current capacity of this diode is 8A, and forward voltage is 1.3V, and the reverse voltage rated value is 600V, and be 75ns reverse recovery time.What export that large resistance C8 selects is the electric capacity of 100 μ F/450V.
Among Fig. 1, the pin 3 input induced current I of control chip
In, its HFS is by pin 2 external circuit filterings, I
InWith input voltage V
InMean-square value be directly proportional, the duty ratio adjustment by to PFC realizes the adjustment to power output.The pin 5 of control chip can obtain the duty ratio of the ripple of inductive current accurately, and what select in this programme is fixing output mode.The signal of the pin 7 output driven MOS FET switches of control chip, by exporting large capacitor C 8 output voltages, and output voltage feeds back to control chip through resistance R 5, R4, R3, control chip can be adjusted in good time, thereby make output voltage stabilization.
Above-described embodiment is the better execution mode of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (1)
1. APFC, it is characterized in that, comprise: power supply inductance (L1), Power Factor Correction Control chip (U1), the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12); The first diode (D1), the second diode (D2), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7), the 8th output large electric capacity (C8); Power switch pipe (Q1), positive-negative-positive triode (Q2); Described Power Factor Correction Control chip (U1) model is NCP1653A;
The pin 1 of described Power Factor Correction Control chip (U1) with by electric capacity (C4) ground connection, and series resistance (R3), (R4), (R5) link to each other with described circuit output end, and be in parallel with resistance (R3) after resistance (R6) is connected with electric capacity (C1); The pin 2 of described Power Factor Correction Control chip (U1) is by electric capacity (C5) ground connection; The pin 3 of described Power Factor Correction Control chip (U1) is by electric capacity (C3) ground connection, and link to each other with resistance (R1), (R2) simultaneously, the other end of resistance (R1) links to each other with the end of the output of prime rectification circuit with power supply inductance (L1), the other end of resistance (R2) with link to each other electric capacity (C2) other end ground connection with electric capacity (C2) end; The pin 4 of described Power Factor Correction Control chip (U1) links to each other with an end of resistance (R7), the other end of resistance (R7) links to each other the other end ground connection of resistance (R12) with the other end of prime rectification circuit and an end of resistance (R12) simultaneously; The pin 5 of described Power Factor Correction Control chip (U1) links to each other with the end of electric capacity (C7) with resistance (R9) respectively, the other end ground connection of electric capacity (C7) and resistance (R9); Pin 6 ground connection of described Power Factor Correction Control chip (U1); The pin 7 of described Power Factor Correction Control chip (U1) links to each other with an end of resistance (R10); The pin 8 of described Power Factor Correction Control chip (U1) links to each other with the end of resistance (R8) with electric capacity (C6), another termination power supply VCC of resistance (R8), the other end ground connection of electric capacity (C6);
The other end of described resistance (R10) links to each other with the positive pole of diode (D1) and the base stage of positive-negative-positive triode respectively, and the other end of diode (D2) links to each other with the emitter of described positive-negative-positive triode, an end of resistance (R11), the grid of power switch pipe (Q2) respectively; The source ground of the other end of the collector electrode of positive-negative-positive triode and resistance (R11), power switch pipe (Q2);
The other end of power supply inductance (L1) links to each other with the drain electrode of power switch pipe (Q1), the positive pole of diode (D2); The other end of diode (D2) links to each other with the positive pole of the large electric capacity of output (C8), exports the other end ground connection of large electric capacity (C8); Tie point and the resistance (R5) of diode (D2) and the large electric capacity of output (C8) is away from to be connected the end that Power Factor Correction Control chip (U1) is connected continuous; Export large electric capacity (C8) two ends as signal output part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105112038A CN103023301A (en) | 2012-11-30 | 2012-11-30 | Active power factor correction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105112038A CN103023301A (en) | 2012-11-30 | 2012-11-30 | Active power factor correction circuit |
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| CN103023301A true CN103023301A (en) | 2013-04-03 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5383109A (en) * | 1993-12-10 | 1995-01-17 | University Of Colorado | High power factor boost rectifier apparatus |
| CN202406017U (en) * | 2011-11-23 | 2012-08-29 | 宁波凯耀电器制造有限公司 | Active power factor correction circuit with input harmonic compensation circuit |
| CN202455263U (en) * | 2012-02-29 | 2012-09-26 | 湖北广兴通信科技有限公司 | High power factor switch power supply |
| CN102694472A (en) * | 2012-05-31 | 2012-09-26 | 深圳茂硕电源科技股份有限公司 | Magnetic integrated high-efficiency boost power supply |
| CN102738811A (en) * | 2012-07-03 | 2012-10-17 | 杭州电子科技大学 | Active power factor correction circuit |
| CN203039573U (en) * | 2012-11-30 | 2013-07-03 | 余姚亿威电子科技有限公司 | Active power factor correction circuit |
-
2012
- 2012-11-30 CN CN2012105112038A patent/CN103023301A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5383109A (en) * | 1993-12-10 | 1995-01-17 | University Of Colorado | High power factor boost rectifier apparatus |
| CN202406017U (en) * | 2011-11-23 | 2012-08-29 | 宁波凯耀电器制造有限公司 | Active power factor correction circuit with input harmonic compensation circuit |
| CN202455263U (en) * | 2012-02-29 | 2012-09-26 | 湖北广兴通信科技有限公司 | High power factor switch power supply |
| CN102694472A (en) * | 2012-05-31 | 2012-09-26 | 深圳茂硕电源科技股份有限公司 | Magnetic integrated high-efficiency boost power supply |
| CN102738811A (en) * | 2012-07-03 | 2012-10-17 | 杭州电子科技大学 | Active power factor correction circuit |
| CN203039573U (en) * | 2012-11-30 | 2013-07-03 | 余姚亿威电子科技有限公司 | Active power factor correction circuit |
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Application publication date: 20130403 |