CN203039573U - Active power factor correction circuit - Google Patents
Active power factor correction circuit Download PDFInfo
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- CN203039573U CN203039573U CN2012206549080U CN201220654908U CN203039573U CN 203039573 U CN203039573 U CN 203039573U CN 2012206549080 U CN2012206549080 U CN 2012206549080U CN 201220654908 U CN201220654908 U CN 201220654908U CN 203039573 U CN203039573 U CN 203039573U
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- resistance
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- power factor
- factor correction
- control chip
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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 utility model discloses an active power factor correction circuit. The active power factor correction circuit is mainly used in LED drive power sources. The active power factor correction circuit includes 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 and a fifth resistor R5, resistor, 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 C3 capacitor, 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 PNP-type triode Q2, wherein the power factor correction control chip U1 is a model NCP1653A chip. Under 220V input broadband, the power factor of the active power factor correction circuit can reach more than 0.96; and the correction effect of the power factor of the active power factor correction circuit is obvious.
Description
Technical field
The utility model relates to electric and electronic technical field, and 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 represents that then harmonic component is big, cause the current waveform distortion, electrical network is polluted, cos θ is fundamental voltage, current displacement factor, numerical value is too low then represent reactive power account for large percentage, 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 Aiternating Current Voltage Ratio 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 operate as normal of disturbing other equipment easily of current harmonics.Therefore, improve power factor, the content power factor correction just that reduces harmonic wave becomes very important research direction in the field of switch power.
The conversion efficiency height of LLC resonance converter is 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 than the efficient height of passive power factor correcting circuit, volume is little.Though pfc circuit simple economy in the past, effect is bad, thus adopt APFC under 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 utility model adopts integrated chip control, can effectively reduce the influence of outer bound pair circuit, and because following feedback to exporting 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 utility model is exactly the raising for technology in this field, the APFC that provides a kind of new LED to drive.
The utility model content
The utility model 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 utility model comprises power supply inductance L 1, Power Factor Correction Control chip U1, first resistance R 1, 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, 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 big 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 afterwards in parallel with R3 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 big capacitor C 8 of output, exports the other end ground connection of big capacitor C 8; Diode D2 links to each other away from an end that is connected with described Power Factor Correction Control chip U1 with resistance R 5 with the tie point of the big capacitor C 8 of output; Export big capacitor C 8 two ends as signal output part.
Through test, capability correction factor of the present utility model 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 utility model.
Fig. 2 is the circuit diagram of a kind of APFC of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Operation principle of the present utility model 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 duty ratio accurately like this, and then control turning on and off of power MOSFET, thereby reach the purpose of power factor correction.
As shown in Figure 2, the utility model comprises power supply inductance L 1, Power Factor Correction Control chip U1, 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, first capacitor C 1, 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 big 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 afterwards in parallel with R3 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 for use 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 input 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 are formed 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 switch ripple 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 for use, 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 big resistance C8 selects for use 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 for use in this programme is fixing output mode.The signal of the pin 7 output driven MOS FET switches of control chip, by exporting big 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 utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spiritual essence of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (1)
1. an APFC is characterized in that, comprising: power supply inductance L 1, Power Factor Correction Control chip U1, first resistance R, 1, the second resistance R 2, the 3rd resistance R 3, the four resistance R 4, the five resistance R 5, the 6th resistance R 6, the seven resistance R 7, the eight resistance R 8, the 9th 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 big capacitor C 8 of first capacitor C, 1, the second capacitor C 2, the three capacitor C, 3, the four capacitor C 4, the five capacitor C, 5, the six capacitor C 6, the seven 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 afterwards in parallel with resistance R 3 with capacitor C 1; 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 resistance R 1, R2 simultaneously, the other end of resistance R 1 links to each other with the output of prime rectification circuit and an end of power supply inductance L 1, the other end of resistance R 2 with link to each other capacitor C 2 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 resistance R 7 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 big capacitor C 8 of output, exports the other end ground connection of big capacitor C 8; Diode D2 links to each other away from an end that is connected with described Power Factor Correction Control chip U1 with resistance R 5 with the tie point of the big capacitor C 8 of output; Export big capacitor C 8 two ends as signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206549080U CN203039573U (en) | 2012-11-30 | 2012-11-30 | Active power factor correction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206549080U CN203039573U (en) | 2012-11-30 | 2012-11-30 | Active power factor correction circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203039573U true CN203039573U (en) | 2013-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012206549080U Expired - Fee Related CN203039573U (en) | 2012-11-30 | 2012-11-30 | Active power factor correction circuit |
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| CN (1) | CN203039573U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023301A (en) * | 2012-11-30 | 2013-04-03 | 余姚亿威电子科技有限公司 | Active power factor correction circuit |
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- 2012-11-30 CN CN2012206549080U patent/CN203039573U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023301A (en) * | 2012-11-30 | 2013-04-03 | 余姚亿威电子科技有限公司 | Active power factor correction circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20151130 |
|
| EXPY | Termination of patent right or utility model |