CN204497973U - A kind of passive power factor correcting circuit - Google Patents
A kind of passive power factor correcting circuit Download PDFInfo
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- CN204497973U CN204497973U CN201520194478.2U CN201520194478U CN204497973U CN 204497973 U CN204497973 U CN 204497973U CN 201520194478 U CN201520194478 U CN 201520194478U CN 204497973 U CN204497973 U CN 204497973U
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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 a kind of passive power factor correcting circuit, comprise the first electric capacity, the second electric capacity, primary inductance, secondary coupling inductance, filter inductance, the first diode and the second diode.The utility model effectively solves existing power factor correction circuit because not by effective degree of closeness obtained between the waveform of control inputs electric current and the waveform of input voltage, and then reduce the harmonic distortion of input current, thus the problem that the power factor that there is circuit is higher, cost is low simultaneously, volume is little, structure is simple, efficiency is high, can be widely used in power factor correction circuit field.
Description
Technical field
The utility model relates to a kind of passive power factor correcting circuit.
Background technology
In power electronic equipment, electronic instrument and household appliances, the AC network power supply of 220V being carried out rectification and obtains DC power supply, is a kind of application very extensively and AC-DC (AC-DC) conversion scheme the most basic.Under normal conditions, this AC-DC conversion is realized by full bridge rectifier, after connect a large filter capacitor, to obtain the comparatively straight direct voltage source of waveform.When the current potential of input ac voltage is lower, the electric energy needed for load is provided by energy storage capacitor, and alternating-current voltage source itself does not provide electric current; When the current potential of input ac voltage is higher, alternating-current voltage source charges directly to storage capacitor.Therefore, although the alternating voltage of input is sinusoidal wave, the alternating current of input is but in pulse type, and wave distortion is serious.Containing a large amount of harmonic waves in the input current of these pulse types, if a large amount of current harmonics components blows back into electrical network, then the harmonic noise level in electrical network can be made to improve on the one hand, cause the harmonic wave " pollution " of electrical network, can produce " quadratic effect " on the other hand, namely electric current flow through line impedance formed harmonic voltage fall, make line voltage (primary sinusoid) also distort conversely.Can fault be caused when these effects are serious, damage converting equipment.If do not have storage capacitor in parallel after rectifier bridge, and be directly the load connecting a purely resistive, so obviously, the phase difference between voltage and current is zero and does not have harmonic current, and power factor is 1.
Therefore power factor correction is in the face of with the essence of power factor controlling (PFC) technology, the input of power consumption equipment will be made exactly to present " purely resistive " input electrical network, namely will make to be directly proportional between input current and input voltage.On the other hand, from the angle of Energy Transfer, PFC technology be make the input of power consumption equipment from input electrical network draw energy, and energy is not fed back to again input electrical network in go.At present, the method solving harmonic pollution in electric power net has two kinds: one to be compensate the harmonic current produced in grid side; Two is arrange passive or active pfc circuit in power electronic equipment inside, reaches the object of PFC.
Utility model content
The purpose of this utility model is to provide a kind of passive power factor correcting circuit, solve existing power factor correction circuit because not by effective degree of closeness obtained between the waveform of control inputs electric current and the waveform of input voltage, and then reduce the harmonic distortion of input current, therefore there is the problem that the power factor of circuit is higher.
The utility model solves the technical scheme that its technical problem adopts: a kind of passive power factor correcting circuit, comprises the first electric capacity, the second electric capacity, elementary coupling inductance, secondary coupling inductance, filter inductance, the first diode and the second diode; The two ends of the first electric capacity are connected with the both positive and negative polarity of ac voltage input respectively; The negative electrode of the second diode is connected with the positive pole of ac voltage input, and the anode of the second diode is connected with the positive pole of the second electric capacity, and the negative pole of the second electric capacity is connected with the negative pole of ac voltage input; One end of auxiliary induction is connected with the anode of the second diode, and the other end is connected with the negative electrode of the first diode; The anode of the first diode is connected with the Same Name of Ends of secondary boost inductance; The other end of secondary boost inductance is connected with main boost inductance Same Name of Ends, and the Same Name of Ends of main boost inductance is connected with the negative pole of DC power output end, the negative pole of another termination second electric capacity; The anode of the second diode is connected with the positive pole of DC power output end.
Further, the second described electric capacity is filter capacitor, and the first electric capacity is buffer capacitor.
Preferably, the first described diode is rectifier diode, and the second diode is fast recovery diode.
The beneficial effects of the utility model: in the course of work, elementary coupling inductance L1 is coupled to the electric current of secondary coupling inductance L2 through the first diode D5, filter inductance L3 charges to the second electric capacity C2, as long as the voltage on the second electric capacity C2 exports busbar voltage higher than rectification, second diode D9 then conducting, electric charge on second electric capacity C2 is just by the second diode D9 powering load, extend the conducting pin of rectifier diode, make the waveform of waveform close to input voltage of input current, reduce the harmonic distortion of input current greatly, thus improve the power factor of circuit.Compared with prior art, the passive power factor correcting circuit cost of the present invention's proposition is low, volume is little, structure is simple, efficiency is high.Power factor optimally can be brought up to 0.99 by this circuit, overcomes the shortcoming that ordinary passive circuit of power factor correction power factor is not high preferably.
The utility model effectively solves existing power factor correction circuit because not by effective degree of closeness obtained between the waveform of control inputs electric current and the waveform of input voltage, and then reduce the harmonic distortion of input current, thus the problem that the power factor that there is circuit is higher, cost is low simultaneously, volume is little, structure is simple, efficiency is high, can be widely used in power factor correction circuit field.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Embodiment
Embodiment, a kind of passive power factor correcting circuit as shown in Figure 1, comprises the first electric capacity C12, the second electric capacity C2, elementary coupling inductance L1, secondary coupling inductance L2, filter inductance L3, the first diode D5 and the second diode D9; The two ends of the first electric capacity C12 respectively with the both positive and negative polarity VIN+ of ac voltage input, VIN-is connected; The negative electrode of the second diode D9 is connected with the positive pole VIN+ of ac voltage input, and the anode of the second diode D9 is connected with the positive pole of the second electric capacity C2, and the negative pole of the second electric capacity C2 is connected with the negative pole VIN-of ac voltage input; One end of auxiliary induction L3 is connected with the anode of the second diode D9, and the other end is connected with the negative electrode of the first diode D5; The anode of the first diode D5 is connected with the Same Name of Ends of secondary boost inductance L2; The other end of secondary boost inductance L2 is connected with main boost inductance L1 Same Name of Ends, and the Same Name of Ends of main boost inductance L1 is connected with the negative pole OUT-of DC power output end, the negative pole of another termination second electric capacity C2; The anode of the second diode D9 is connected with the positive pole OUT+ of DC power output end.
The second described electric capacity C2 is buffer capacitor, and the first electric capacity C12 is filter capacitor.
The first described diode D5 is rectifier diode, and the second diode D9 is fast recovery diode.
Power factor (PF) is defined as the ratio of active power and apparent power, as shown in (1) formula, wherein Vin represents input voltage, the effective value of I indicating impulse electric current, In represents the effective value of the n-th subharmonic, I1 represents the effective value of fundamental current, and θ is fundamental current I1 and the differing of input voltage vin.
Wherein
total harmonic distortion factor (Total Harmonics Distortion, THD) is defined as total effective value of higher harmonic current component and the ratio of fundamental current effective value, as shown in (2) formula.
Relation available (3) formula of power factor and total harmonic distortion factor represents.When difference θ is 0, and during THD<5%, power factor can control more than 0.99.Therefore, the raising of power factor, mainly from reduction harmonic current component, reduces input fundamental current and carries out with these two aspects that differ of input voltage.
In power electronic equipment, electronic instrument and household appliances, the AC network power supply of 220V being carried out rectification and obtains DC power supply, is a kind of application very extensively and AC-DC (AC-DC) conversion scheme the most basic.Under normal conditions, this AC-DC conversion is realized by full bridge rectifier, after connect a large filter capacitor, to obtain the comparatively straight direct voltage source of waveform.When the current potential of input ac voltage is lower, the electric energy needed for load is provided by energy storage capacitor, and alternating-current voltage source itself does not provide electric current; When the current potential of input ac voltage is higher, alternating-current voltage source charges directly to storage capacitor.Therefore, although the alternating voltage of input is sinusoidal wave, the alternating current of input is but in pulse type, and wave distortion is serious.Containing a large amount of harmonic waves in the input current of these pulse types, if a large amount of current harmonics components blows back into electrical network, then the harmonic noise level in electrical network can be made to improve on the one hand, cause the harmonic wave " pollution " of electrical network, can produce " quadratic effect " on the other hand, namely electric current flow through line impedance formed harmonic voltage fall, make line voltage (primary sinusoid) also distort conversely.Can fault be caused when these effects are serious, damage converting equipment.
If do not have storage capacitor in parallel after rectifier bridge, and be directly the load connecting a purely resistive, so obviously, the phase difference between voltage and current is zero and does not have harmonic current, and power factor is 1.Therefore power factor correction.
Claims (3)
1. a passive power factor correcting circuit, is characterized in that: comprise the first electric capacity (C12), the second electric capacity (C2), elementary coupling inductance (L1), secondary coupling inductance (L2), filter inductance (L3), the first diode (D5) and the second diode (D9); The two ends of the first electric capacity (C12) are connected with the both positive and negative polarity (VIN+, VIN-) of ac voltage input respectively; The negative electrode of the second diode (D9) is connected with the positive pole (VIN+) of ac voltage input, the anode of the second diode (D9) is connected with the positive pole of the second electric capacity (C2), and the negative pole of the second electric capacity (C2) is connected with the negative pole (VIN-) of ac voltage input; One end of auxiliary induction (L3) is connected with the anode of the second diode (D9), and the other end is connected with the negative electrode of the first diode (D5); The anode of the first diode (D5) is connected with the Same Name of Ends of time boost inductance (L2); The other end of secondary boost inductance (L2) is connected with main boost inductance (L1) Same Name of Ends, the Same Name of Ends of main boost inductance (L1) is connected with the negative pole (OUT-) of DC power output end, the negative pole of another termination second electric capacity (C2); The anode of the second diode (D9) is connected with the positive pole (OUT+) of DC power output end.
2. passive power factor correcting circuit according to claim 1, is characterized in that: described the second electric capacity (C2) is buffer capacitor, and the first electric capacity (C12) is filter capacitor.
3. passive power factor correcting circuit according to claim 1, is characterized in that: described the first diode (D5) is rectifier diode, and the second diode (D9) is fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520194478.2U CN204497973U (en) | 2015-04-01 | 2015-04-01 | A kind of passive power factor correcting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520194478.2U CN204497973U (en) | 2015-04-01 | 2015-04-01 | A kind of passive power factor correcting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204497973U true CN204497973U (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520194478.2U Active CN204497973U (en) | 2015-04-01 | 2015-04-01 | A kind of passive power factor correcting circuit |
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|---|---|
| CN (1) | CN204497973U (en) |
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2015
- 2015-04-01 CN CN201520194478.2U patent/CN204497973U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Unit B 29 building 518000 Guangdong city of Shenzhen province Nanshan District Guangdong streets high-tech park in a high-tech South Branch Building Patentee after: Shenzhen billion Tengda integrated Limited by Share Ltd Address before: 518000 room 602, seat B of Tianan digital Times Building, Che Kung Temple, Futian District, Shenzhen, Guangdong Patentee before: Electronics Co., Ltd. is thought to rise in Shenzhen hundred million |
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| CP03 | Change of name, title or address |