CN201252480Y - High-frequency passive PFC circuit - Google Patents
High-frequency passive PFC circuit Download PDFInfo
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- CN201252480Y CN201252480Y CNU2008201468288U CN200820146828U CN201252480Y CN 201252480 Y CN201252480 Y CN 201252480Y CN U2008201468288 U CNU2008201468288 U CN U2008201468288U CN 200820146828 U CN200820146828 U CN 200820146828U CN 201252480 Y CN201252480 Y CN 201252480Y
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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 relates to a high-frequency passive PFC circuit, wherein the anode of a secondary low-frequency rectifier diode (D1) and one end of a high-frequency delay inductance (L2) are connected together to a positive output end of a primary low-frequency rectifier diode (BD1) after being electrically connected, and the other end of the high-frequency delay inductance (L2) is electrically connected with the anode of a high-frequency rectifier diode (D2), the cathode of the high-frequency rectifier diode (D2) is electrically connected with one end of the feedback winding of a high-frequency transformer (T), the cathode of the low-frequency rectifier diode (D1) is electrically connected with the other end of the feedback winding of the high-frequency transformer (T). An output filter capacitor is charged in two paths, one path is firstly conducted by the secondary low-frequency rectifier diode (D1) to charge for the output filter capacitor, and the other path is conducted by the high-frequency rectifier diode (D2) after delaying to charge for same through the feedback winding of the high-frequency transformer (T). The high-frequency passive PFC circuit has the advantages of little elements consumption, simple circuit, high whole frequency of a circuit, small electromagnetic radiation, low production cost and little pollution of harmonic wave to electrified wire netting.
Description
Technical field the utility model relates to power circuit, particularly relates to circuit of power factor correction.
PFC (power factor correction) circuit commonly used in the background technology prior art includes two kinds: passive pfc circuit of LC filtering and active PFC circuit.
The passive pfc circuit of LC as shown in figure 11, inductance L 1 of series connection in circuit, in order to guarantee certain inductance value, usually adopt cored inductance, in each half period of AC-input voltage, when voltage rose to dc voltage value on the filter capacitor C1, electric current will be by inductance L 1 and rectifier diode, two rectifier diodes in the bridge heap BD1 flow into main winding and the switching tube Q1 of high frequency transformer T simultaneously to capacitor C 1 charging.When the input sinusoidal voltage is higher than voltage on the capacitor C 1, the polarity on the inductance L 1 as shown in figure 11, the inductance stored energy.When the input sinusoidal voltage is low to moderate capacitor C 1 voltage, inductance is constant in order to keep electric current, induced potential polarity begins anti-phase, inductance is transferred to by stored energy and releasing energy, this moment, AC-input voltage and inductance electromotive force series aiding connection continued as main winding and the switching tube Q1 power supply of high frequency transformer T by two rectifier diodes in the bridge heap BD1, discharged up to energy to finish, the inductance electromotive force is zero, the half period end-of-job.
Passive pfc circuit, because the metering function of inductance and the storage and the release action of half period work capacity, compare with the general pfc circuit that do not add, passive pfc circuit has reduced the input current amplitude, increased rectifier diode ON time in the half period, no matter be that power factor (PF) or input current total harmonic distortion THD all are improved.Sort circuit is simple and reliable, and power factor can reach more than 0.8, and THD is about 60%.But have the following disadvantages: volume is big, can not reach the requirement of High Power Factor, and efficient is low, and the inductance copper consumption is big.
Active PFC circuit as shown in figure 12.Active Power Factor Correction can be carried out dynamic calibration rapidly to the harmonic wave that changes, and characteristic is not subjected to the influence of electric network impedance and load impedance, compare with PPFC (Passive Power Factor Correction) and to have correction advantage more completely, Active Power Factor Correction is the effective ways that suppress harmonic current, improve power factor.As shown in figure 12, its operation principle is: AC-input voltage is through bridge heap BD1 rectification, the pfc circuit of forming through components and parts such as L1, D1, C2, R2, R3, Q1, R1 and PFC chips again, make input current average value follow bridge heap BD1 rectifier output voltage fiducial value by control corresponding, and keep output voltage stabilization.Active PFC has two feedback control loops: voltage control loop and current controlled circuit, current controlled circuit make the pfc circuit input current identical with BD1 commutating voltage waveform, and the output voltage control loop makes the pfc circuit output dc voltage stable, is a direct current source of stable pressure.The active PFC circuit operation principle is to force input current to follow the tracks of input voltage by control circuit, realizes the input current sineization, and synchronous with input voltage, and its effect is equivalent to a pure resistance.The advantage of active PFC circuit is: level and smooth input AC waveform is arranged; High Power Factor, its power factor PF value can reach more than 0.99; Low harmonics distortion, THD＜10%; Wide input voltage range; VD is stable.But have the following disadvantages simultaneously: use components and parts more, the circuit complexity; Reduced the overall efficiency of circuit; Electromagnetic interference is big; The cost height.
Utility model content the technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and to propose a kind of cost low, and volume is little, meets the high frequency passive pfc circuit of national harmonic standard.
The utility model solve the technical problem can be by realizing by the following technical solutions:
Design, a kind of high frequency passive pfc circuit of use, comprise ac input circuit, an infra-low frequency rectification circuit BD1, high frequency transformer T and output filter capacitor, also comprise the feedback winding A-B of two infra-low frequency rectifier diode D1, high frequency delay inductance L 2 and high-frequency rectification diode D2 and high frequency transformer T; Described two infra-low frequency rectifier diode D1 anodes and the positive output end that is connected to an infra-low frequency rectification circuit BD1 after an end of high frequency delay inductance L 2 is electrically connected jointly, the other end of this high frequency delay inductance L 2 is electrically connected with high-frequency rectification diode D2 anode, this high-frequency rectification diode D2 negative electrode is electrically connected with feedback winding A-B one end of described high frequency transformer T, is connected to the positive pole of output filter capacitor after the other end electrical connection of low frequency rectifier diode D1 negative electrode with the feedback winding A-B of described high frequency transformer T jointly;
A described infra-low frequency rectification circuit BD1 rectifier output voltage divides two-way to give described output filter capacitor charging, described output filter capacitor charging is given in the conducting of the described two infra-low frequency rectifier diode D1 of one route elder generation, another road is that described high-frequency rectification diode D2 conducting is charged to output filter capacitor through the feedback winding A-B of high frequency transformer T through after described high frequency delay inductance L 2 time-delays.
Because the metering function of inductance L 1 and storage of the A-B winding energy of high frequency transformer and release action, reduced the amplitude of input current, increase the conducting angle of high-frequency rectification diode D2, make the input current sineization, and it is synchronous with voltage, thereby improved power factor (PF), reduced the generation of harmonic wave.Compared with prior art, the utlity model has following beneficial effect: use components and parts few, circuit is simple, circuit whole efficiency height, and electromagnetic radiation is little, and cost is low, and harmonic wave is little to electric network pollution.
Description of drawings
Fig. 1 is the utility model high frequency passive pfc circuit schematic diagram;
Fig. 2 is the circuit theory diagrams of described high frequency passive pfc circuit embodiment one;
Fig. 3 is the circuit theory diagrams of described high frequency passive pfc circuit embodiment two;
Fig. 4 is the current waveform schematic diagram of diode D2 low frequency half period among Fig. 1;
Fig. 5 is the holocyclic current waveform schematic diagram of diode D2 low frequency among Fig. 1;
Fig. 6 is the current waveform schematic diagram of diode D1 low frequency half period among Fig. 1;
Fig. 7 is the holocyclic current waveform schematic diagram of diode D1 low frequency among Fig. 1;
Fig. 8 is the holocyclic current waveform schematic diagram of diode D2 high frequency among Fig. 1;
Fig. 9 is the ripple voltage waveform schematic diagram of capacitor C 2 among Fig. 1;
Figure 10 is the waveform schematic diagram of output voltage V DC among Fig. 3;
Figure 11 is a passive pfc circuit schematic diagram in the prior art;
Figure 12 is an active PFC circuit schematic diagram in the prior art.
Embodiment is described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing.
As shown in Figure 3, high frequency passive pfc circuit composition of the present invention and components and parts effect are as follows:
Dotted portion is the high frequency passive pfc circuit, and circuit is formed components and parts and is: the A-B winding of capacitor C 1, inductance L 2, diode D1, diode D2 and high frequency transformer.Capacitor C 1 positive pole is electrically connected with diode D1 anode and inductance L 2 one ends, and the L2 other end is electrically connected with diode D2 anode, and diode D2 negative electrode is electrically connected with the A end of high frequency transformer A-B winding, and diode D2 negative electrode is electrically connected with the B end of high frequency transformer A-B winding.Capacitor C 1 effect is to filter ripple and noise, suppresses the generation of EMI.The effect of inductance L 2 is to form the PFC inductance with the A-B windings in series of high frequency transformer.The effect of diode D1 is two infra-low frequency rectifications.The effect of diode D2 is isolation, high-frequency rectification.
Described high frequency passive pfc circuit operation principle is as follows:
During startup, one infra-low frequency rectification circuit is that bridge heap BD1 rectifier output voltage divides two-way to give output filter capacitor C2 charging, the conducting of one route diode D1 elder generation gives capacitor C 2 chargings, another road is that diode D2 conducting gives capacitor C 2 chargings through the feedback winding A-B of high frequency transformer by after delaying time through inductance L 2.When the PWM chip operation, in first cycle, the feedback winding A-B of high frequency transformer T produces induced potential A "+" during switching tube Q1 conducting, B "-", and diode D2 ends, the electric energy power supply that capacitor C 2 stores.When switching tube Q1 ends, the feedback winding A-B induced potential A "-" of high frequency transformer T, B "+", diode D2 rectification conducting, the induced potential that the feedback winding A-B of bridge heap BD1 low frequency rectifier output voltage and high frequency transformer T produces superpose through diode D2 high-frequency rectification and charge to output filter capacitor C2.Diode D1 ends when the voltage on the capacitor C 1 is lower than voltage on the output capacitance C2, when the voltage on the capacitor C 1 is higher than voltage on the capacitor C 2, and diode D1 conducting, first cycle finishes.When entering second period, repeat the action of period 1, and so forth.Because the metering function of inductance L 1 and storage of the feedback winding A-B energy of high frequency transformer and release action, reduced the amplitude of input current, increased the conducting angle of high-frequency rectification diode D2, make the input current sineization, and it is synchronous with voltage, thereby the raising power factor (PF) reduces the generation of harmonic wave.
The circuit theory diagrams of the embodiment of the invention one as shown in Figure 2, an end that suppresses the capacitor C 1 of electromagnetic interference EMI is electrically connected with diode D1 anode and high frequency delay inductance L 1 one ends simultaneously, this inductance L 1 other end is electrically connected with high-frequency rectification diode D2 anode, this diode D2 negative electrode is electrically connected with the A end of the feedback winding A-B of high frequency transformer, and diode D1 negative electrode is electrically connected with the B end of high frequency transformer feedback winding A-B.The concrete course of work is as follows:
The civil power AC-input voltage becomes unidirectional pulsating dc voltage by an infra-low frequency rectification circuit BD1, in first unidirectional pulsating voltage half period of AC-input voltage, low frequency rectifier diode D1 conducting when one infra-low frequency rectifier output voltage rises to the magnitude of voltage of output filter capacitor C2, turn-on frequency is the twice of mains frequency, and electric current will charge to output filter capacitor C2 by diode D1.When the feedback winding A-B of high frequency transformer produces induced voltage, A, B two terminal potentials height alternate, when high frequency transformer winding A end is in electronegative potential, diode D2 conducting, the low frequency rectifier output voltage superposes to output capacitance C2 charging through the D2 high-frequency rectification with the induced potential of the feedback winding A-B generation of high frequency transformer, and turn-on frequency is identical with the frequency of high frequency transformer induced potential.When the winding A of high frequency transformer end was in high potential, diode D2 ended.In the unidirectional pulsating voltage of the low frequency half period, because the time-lag action of inductance L 2, diode D2 has electric current to pass through all the time, and the variation of voltage is followed in the variation of electric current, thereby the raising power factor reduces the generation of harmonic current, and first half period finishes, second semiduation repeats the work of period 1, so periodic duty.Fig. 4 is a diode D2 low frequency half period current waveform figure.Fig. 5 is a low frequency complete period diode D2 current waveform schematic diagram.Fig. 6 is a diode D1 low frequency half period current waveform figure.Fig. 7 is a diode D1 low frequency complete period current waveform schematic diagram.Fig. 8 is a diode D2 high frequency complete period current waveform schematic diagram.Fig. 9 capacitor C 2 ripple voltage waveform schematic diagrames.
The circuit theory diagrams of the embodiment of the invention two as shown in Figure 2, the tie point that one of capacitor C 1 that suppresses EMI is rectified extremely with diode D1 anode and inductance L 2 one ends is electrically connected, the L2 other end is electrically connected with diode D2 anode, diode D2 negative electrode is electrically connected with the A end of high frequency transformer feedback winding A-B, diode D1 negative electrode is electrically connected with the B end of high frequency transformer feedback winding A-B, diode D1 negative electrode connects with diode D3 negative electrode and output capacitance C2 positive electrical, diode D3 anode connects with diode D4 negative electrode and electrochemical capacitor C3 positive electrical, output capacitance C2 negative pole is electrically connected with diode D4 anode, and electrochemical capacitor C3 negative pole is electrically connected with diode D5 anode.The course of work is identical with embodiment one, and difference is that the output filter capacitor C2 among the embodiment one is replaced with filling out paddy current rectifying and wave filtering circuit (D3, C2, D4, C3, D5 composition).Figure 10 is an output voltage V
DCThe waveform schematic diagram.
Claims (3)
1. a high frequency passive pfc circuit comprises ac input circuit, an infra-low frequency rectification circuit (BD1), high frequency transformer (T) and output filter capacitor, it is characterized in that:
The feedback winding (A-B) that also comprises two infra-low frequency rectifier diodes (D1), high frequency delay inductance (L2) and high-frequency rectification diode (D2) and high frequency transformer (T); Described two infra-low frequency rectifier diode (D1) anodes and the positive output end that is connected to an infra-low frequency rectification circuit (BD1) after an end of high frequency delay inductance (L2) is electrically connected jointly, the other end of this high frequency delay inductance (L2) is electrically connected with high-frequency rectification diode (D2) anode, this high-frequency rectification diode (D2) negative electrode is electrically connected with feedback winding (A-B) end of described high frequency transformer (T), is connected to the positive pole of output filter capacitor after the other end electrical connection of low frequency rectifier diode (D1) negative electrode with the feedback winding (A-B) of described high frequency transformer (T) jointly;
Described infra-low frequency rectification circuit (BD1) rectifier output voltage divides two-way to give described output filter capacitor charging, described output filter capacitor charging is given in the first conducting of the described two infra-low frequency rectifier diodes (D1) of one route, another road is that described high-frequency rectification diode (D2) conducting is charged to output filter capacitor through the feedback winding (A-B) of high frequency transformer (T) through after described high frequency delay inductance (L2) time-delay.
2. high frequency passive pfc circuit as claimed in claim 1, it is characterized in that: also comprise the electric capacity (C1) that is used to suppress electromagnetic interference, the positive pole of this electric capacity (C1) is electrically connected with the anode of two infra-low frequency rectifier diodes (D1) and an end of high frequency delay inductance (L1) respectively.
3. high frequency passive pfc circuit as claimed in claim 1, it is characterized in that: also comprise first diode (D3) that is used to fill out the paddy rectifying and wave-filtering, second diode (D4) and the 3rd diode (D5), described output capacitance is two, the negative electrode of described two infra-low frequency rectifier diodes (D1) is connected with the negative electrode of first diode (D3) and the positive electrical of first output capacitance (C2) respectively, the anode of this first diode D3 is connected with the second output capacitance C3 positive electrical with the negative electrode of the second diode D4 respectively, first output capacitance (C2) negative pole is electrically connected with second diode (D4) anode, and second output capacitance (C3) negative pole is connected the common body contact in back with the 3rd diode D5 positive electrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201468288U CN201252480Y (en) | 2008-08-20 | 2008-08-20 | High-frequency passive PFC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201468288U CN201252480Y (en) | 2008-08-20 | 2008-08-20 | High-frequency passive PFC circuit |
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| Publication Number | Publication Date |
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| CN201252480Y true CN201252480Y (en) | 2009-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201468288U Expired - Lifetime CN201252480Y (en) | 2008-08-20 | 2008-08-20 | High-frequency passive PFC circuit |
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| CN (1) | CN201252480Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656468B (en) * | 2008-08-20 | 2011-11-02 | 深圳桑达百利电器有限公司 | High-frequency passive power factor correction circuit and high-frequency passive power factor correction method |
| CN104467428A (en) * | 2013-09-16 | 2015-03-25 | 通嘉科技股份有限公司 | Light-load power factor-improved power supply and control method |
-
2008
- 2008-08-20 CN CNU2008201468288U patent/CN201252480Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656468B (en) * | 2008-08-20 | 2011-11-02 | 深圳桑达百利电器有限公司 | High-frequency passive power factor correction circuit and high-frequency passive power factor correction method |
| CN104467428A (en) * | 2013-09-16 | 2015-03-25 | 通嘉科技股份有限公司 | Light-load power factor-improved power supply and control method |
| CN104467428B (en) * | 2013-09-16 | 2018-03-06 | 通嘉科技股份有限公司 | Can improve the work(of underloading because power supply unit and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090603 Effective date of abandoning: 20080820 |