CN103036417A - Power factor improved circuit - Google Patents
Power factor improved circuit Download PDFInfo
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- CN103036417A CN103036417A CN2011102925643A CN201110292564A CN103036417A CN 103036417 A CN103036417 A CN 103036417A CN 2011102925643 A CN2011102925643 A CN 2011102925643A CN 201110292564 A CN201110292564 A CN 201110292564A CN 103036417 A CN103036417 A CN 103036417A
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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 a power factor improved circuit. A low-frequency filter unit for adjusting the current and the voltage input into a pulse width modulation control integrated circuit (IC) is arranged between two electrodes of an output end of a rectifying unit, a first compensation network and a second compensation network are arranged between a current compensation end and a voltage compensation end of the pulse width modulation control IC, the current gain value of a phase adjustment unit is reduced by utilizing the first compensation network and the second compensation network, unrequired actions caused by the pulse width modulation control IC can be avoided, and the aim of reaching to higher than 0.90 performance factor (PF) control can be achieved under the total voltage 90-264v input.
Description
Technical field
The relevant a kind of power factor correction circuit of the present invention refers to that especially a kind of volume is little, with low cost, and can design in total head 90 ~ 264V input down, reaches PF and is controlled in power factor correction circuit more than 0.90.
Background technology
Constantly grow up in consumption electronic products and led drive circuit market in recent years, so that more power saving and miniaturization of power supply changeover device, many power electronics relevant devices often use conventional AC/direct current transducer (AC/DC Converter) now, conventional AC/direct current transducer, formed by four diodes and output capacitance, be called again peak rectifier (Peak Rectifier), its advantage is that cheap, circuit is stable, but also has simultaneously the shortcomings such as low power factor and higher harmonics (Harmonics).
Therefore, single with electric energy, improve power factor (Power Factor, PF), also can improve simultaneously the electric energy utilization rate, at present common solution is installing power factor corrector (Power Factor Correction, PFC), and in conjunction with typical pulse-widths modulator (PWM) circuit (as shown in Figure 1), although it can promote power factor between 0.98 ~ 0.99, but deposit because the volume of whole system is large and cost is higher, and cause the restriction on the miniaturization electronics applications.
Another power factor controlling utilization passive type element that belongs to passive type simply improves the purpose (as shown in Figure 2 fill out valley line road) of PF and decline total harmonic distortion (THD).Usually the usefulness of this kind passive type power factor controlling technology is quite low, only near industrywide standard " acceptable " lower limit.
Moreover, exploitation along with the global concern green energy resource, the efficient of power supply also comes into one's own, and the power supply IC with semiconductor control has played the part of the key player of raising efficiency, and the control technology of power supply IC allows power supply can save whole cost, reduces unnecessary switch cost.It mainly uses the pulse direct current signal with positive half cycle string type wave shape with the modulation as the work period pulsewidth, uses to make load continue running with complete string type wave shape.Yet, the simple pulse direct current signal of positive half cycle string type wave shape that uses of the similar string type wave shape power factor correction circuit of commonly using is with the modulation as the work period pulsewidth, still have the anxiety that causes line efficiency to reduce, and still can't design at present in full voltage 90 ~ 264V input down, reach PF and be controlled in lifting usefulness more than 0.90.
Summary of the invention
Technical problem solved by the invention is namely providing a kind of volume little, with low cost, and can design in total head 90 ~ 264V input down, reaches PF and is controlled in power factor correction circuit more than 0.90.
Technical scheme of the present invention is: power factor correction circuit of the present invention has consisted essentially of: a rectification unit, an IC start unit, a filter unit, pulse-width modulation control IC, a power switch component, a voltage transformation unit, a low frequency filtering unit, and first, second compensating network; Wherein, this rectification unit is for obtaining interchange string signal period of wave of civil power and being converted to first a pulse direct current signal with positive half cycle string type wave shape; This IC start unit supplies to obtain the first pulse direct current signal of this rectification unit, and exports the second pulse direct current signal after dividing potential drop; This filter unit is for obtaining the first pulse direct current signal of this rectification unit and output one direct current electric power signal after filtering; This pulse-width modulation control IC for the second pulse direct current signal of obtaining this rectification unit with as the accurate signal in position, and according to the second pulse direct current signal to determine output power turn-on cycle signal; This power switch component is for the electric power turn-on cycle signal of obtaining this pulse-width modulation control IC and the direct current power signal of this filter unit, and according to electric power turn-on cycle signal to cut apart the direct current power signal as a plurality of continuous voltage pulse wave signals, by this continuous voltage pulse wave signal; Corresponding each the voltage pulse signal of this voltage transformation unit receives continuous voltage pulse wave signal, and complies with the input voltage start output voltage of each voltage pulse signal.
As for, this low frequency filtering unit is located between these rectification unit output the two poles of the earth, and the voltage and the electric current that input to this pulse-width modulation control IC in order to adjustment are homophase; This first, second compensating network is made of the current compensation end that is connected respectively to this pulse-width modulation control IC and the RC circuit of voltage compensation end, for the current gain value of controlling IC in order to reduce this pulse-width modulation, make this pulse-width modulation control IC can't see PEAK (peak-peak) waveform in each work period, avoid this pulse-width modulation control IC to produce unwanted action.
Utilize above-mentioned feature, power factor correction circuit of the present invention mainly will input to voltage and the electric current homophase of this pulse-width modulation control IC, and electric current is along with the voltage change and change, and then reach the function of bring to power factor (PF); Simultaneously, utilize first, the second compensating network reduces current gain (Gain) value of this phasing unit, make this pulse-width modulation control IC can't see PEAK (peak-peak) waveform in each work period, avoid this pulse-width modulation control IC to produce unwanted action, its effect is just as changing Cycle by Cycle Current mode (consecutive periods current-mode) into RMS current mode (validity current-mode), and can obtain a stable Duty Cycle (work period) (ON), also because Output Duty Cycle is stable, so also stable lifting of PF value, no longer vibration, and can design under total head 90 ~ 264V input, reach PF and be controlled in 0.90 the above object.
According to above-mentioned principal character, power factor correction circuit of the present invention can further be provided with the auxiliary winding of a detecting and reach the function of deciding voltage in order to cooperate this voltage transformation unit back coupling detecting voltage to this pulse-width modulation to control IC for comparing with this pulse-width modulation control IC internal reference voltage, using.
According to above-mentioned principal character, power factor correction circuit of the present invention can be further be provided with usefulness so that more specifically phase compensation unit of this first compensating network effect (voltage supplied compensates use) between the current sense terminal of this pulse-width modulation control IC and this voltage controlled element.
Above-mentioned phase compensation unit is that current sense terminal and the RC circuit between this voltage controlled element that is connected in this pulse-width modulation control IC consists of.
According to above-mentioned principal character, the electric current of described pulse-width modulation control IC is detectd and is parallel with one between side and this voltage controlled element for the impedance component of adjusting this pulse-width modulation control IC peak power output.
Power factor correction circuit of the present invention can produce following advantages.
1. volume is little, with low cost.
2. can simply use single-stage pulse-width modulation control IC to be applied to pfc circuit, and overcome PF and can't under total head 90 ~ 264V input, keep its PF0.90 and the optimal representation of efficient more than 85%.
3. employed single-stage pulse-width modulation control IC is the control model of front end feedback type, itself has the function of CV (deciding voltage)/CC (deciding electric current) or PWM Control, and secondary terminals CC/CV feedback function.
4. can simply use single-stage pulse-width modulation control IC to finish PFC and high efficiency LED or CCFL switch mode power drive circuit, not only can carry out light modulation to LED or CCFL in the AC end, and solve the problem of LED or CCFL flicker with relatively more positive means.
Description of drawings
Fig. 1 commonly uses active power factor control circuit Organization Chart.
Fig. 2 commonly uses passive type power factor control circuit Organization Chart.
Fig. 3 is the power factor correction circuit structure composed figure of a preferred embodiment of the present invention.
The figure number explanation:
11 rectification units
12 IC start units
13 filter units
14 pulse-width modulation control IC
15 power switch components
16 voltage transformation unit
The auxiliary winding of 17 detectings
20 low frequency filtering unit
31 first and second compensating networks
32 phasing units
40 impedance components.
Embodiment
Shown in the power factor correction circuit structure composed figure of Fig. 3 a preferred embodiment of the present invention, power factor correction circuit of the present invention has consisted essentially of: a rectification unit 11, an IC start unit 12, a filter unit 13, pulse-width modulation control IC14, power switch component 15, a voltage transformation unit 16, a low frequency filtering unit 20, and first, second compensating network 31.
Wherein, this rectification unit 11 can be for just like the bridge full wave rectifier shown in the figure, for obtaining interchange string signal period of wave of civil power and being converted to first a pulse direct current signal with positive half cycle string type wave shape.
This IC start unit 12 can for just like the resistor shown in the figure, for the first pulse direct current signal of obtaining this rectification unit 11, and be exported the second pulse direct current signal after dividing potential drop.
This filter unit 13 can supply to obtain the first pulse direct current signal of this rectification unit 11 and export a direct current electric power signal after filtering, and the surging that this high frequency switched circuit is produced be level and smooth for just like the RC filter shown in the figure, reduces NOISE and produces.
This pulse-width modulation control IC14 can be for just like the control of the single-stage pulse-width modulation shown in figure IC, for the second pulse direct current signal of obtaining this rectification unit 11 with as the accurate signal in position, and according to the second pulse direct current signal to determine output power turn-on cycle signal.
This power switch component 15 can be passage enhancement mode MOSFET as shown in the figure, for the electric power turn-on cycle signal of obtaining this pulse-width modulation control IC14 and the direct current power signal of this filter unit, and according to electric power turn-on cycle signal to cut apart the direct current power signal as a plurality of continuous voltage pulse wave signals, by this continuous voltage pulse wave signal.
These voltage transformation unit 16 corresponding each voltage pulse signals receive continuous voltage pulse wave signal, and comply with the input voltage start output voltage of each voltage pulse signal.
As for, this low frequency filtering unit 20 is located between these rectification unit 11 output the two poles of the earth, and it can be for just like the capacitor (C shown in the figure
DL) consist of, the voltage and the electric current that mainly input to this pulse-width modulation control IC14 in order to adjustment are homophase.
This first, second compensating network 31 can be by the RC circuit formation that this pulse-width modulation is controlled current compensation end (COMI) and the voltage compensation end (COMV) of IC14 that is connected respectively to as shown in the figure, for the current gain value that reduces this pulse-width modulation control IC14, make this pulse-width modulation control IC14 can't see PEAK (peak-peak) waveform in each work period, avoid this pulse-width modulation control IC14 to produce unwanted action.
In principle, utilize above-mentioned feature, power factor correction circuit of the present invention mainly utilizes voltage and the electric current homophase that will input to this pulse-width modulation control IC14, and electric current is along with the voltage change and change, and then reaches the function of bring to power factor (PF); That is, when Output arrive set definite value 2/3 the time, can be because of the change of Input because of the change Duty Cycle (work period) of this phasing unit 32, Duty Cycle can change with waveform always, but controls the operating frequency of IC14 because of this pulse-width modulation〉120H
ZOr 100H
ZSo, each 100H
ZThe On/Off change action that has more than 400 times comes generation current, and then reaches the purpose of High PF.
Simultaneously, utilize first, the second compensating network 31 reduces current gain (Gain) value of this pulse-width modulation control IC14, manifest the function of stablizing Duty Cycle, make this pulse-width modulation control IC can't see PEAK (peak-peak) waveform in each work period, avoid this pulse-width modulation control IC to produce unwanted action, its effect is just as changing Cycle by Cycle Current mode (consecutive periods current-mode) into RMS current mode (validity current-mode), and can obtain a stable Duty Cycle (ON), also because Output Duty Cycle is stable, so also stable lifting of PF value, and can design under total head 90 ~ 264V input, reach PF and be controlled in 0.90 the above object.
Certainly, power factor correction circuit of the present invention is when implementing, can further be provided with one detect the auxiliary winding 17 of side in order to cooperate this voltage transformation unit 16 to feedback to detect side voltage to this pulse-width modulation control IC14 for this pulse-width modulation control IC14 internal reference voltage relatively, use and reach the function of deciding voltage.
And, can further detect at the electric current of this pulse-width modulation control IC14 and be provided with a usefulness between side (CS) and this power switch component 15 so that this first, second compensating network 31 acts on more specifically phasing unit 32.This phasing unit 32 can consist of for the RC circuit of detecing between side (CS) and this power switch component 15 just like the electric current that is connected in this pulse-width modulation control IC14 shown in the figure.Even, the electric current of this pulse-width modulation control IC14 is detectd and is parallel with one between side (CS) and this voltage controlled element 15 for the impedance component 40 of adjusting this pulse-width modulation and control the IC14 peak power output, and this impedance component 40 can be for just like the resistor (R shown in the figure
CS), and see through the simple mode that changes resistance value, reach the purpose of setting this pulse-width modulation control IC14 Max output power.
Particularly, the present invention mainly provides a kind of PFC active circuits of not using also not use the power-factor improvement mode of filling out the valley line road, mainly utilizes the D=K basic mathematic model for adjusting benchmark; For example, the best operating point with voltage transformation unit is set in 90V Duty＜=0.7 and 264V Duty＞=0.3, the C of this low frequency filtering unit 20
DLValue is established to the resistance value R of its impedance component 40 of 0.10uF ~ 0.35uF/450V
CSThe setting output current is maximum output current, its CAP
COMIBe amplified to 105/16V, current gain is made as 1, so can be under the situation of 90 ~ 264V AC Input/Full Load, maintenance PFC＞=more than 0.90.
Compare with traditional located by prior art, power factor correction circuit of the present invention can produce following advantages:
1. volume is little, with low cost.
2. can simply use single-stage pulse-width modulation control IC to be applied to pfc circuit, and overcome PF can't be lower in total head 90 ~ 264V input, keep the optimal representation more than its PF0.90 and 85%.
3. employed single-stage pulse-width modulation control IC is the control model of front end feedback type, itself has the function of CV/CC or PWM Control, and secondary terminals CC/CV feedback function.
4. can simply use single-stage pulse-width modulation control IC to finish PFC and high efficiency LED or CCFL switch mode power drive circuit, not only can carry out light modulation to LED or CCFL in the AC end, and solve the problem of LED or CCFL flicker with relatively more positive means.
Claims (5)
1. a power factor correction circuit is characterized in that, includes:
One rectification unit is for obtaining interchange string signal period of wave of civil power and being converted to first a pulse direct current signal with positive half cycle string type wave shape;
One IC start unit is obtained the first pulse direct current signal of this rectification unit, and exports the second pulse direct current signal after dividing potential drop;
One filter unit is obtained the first pulse direct current signal of this rectification unit and output one direct current electric power signal after filtering;
One pulse-width modulation control IC, in order to the second pulse direct current signal of obtaining this rectification unit with as the accurate signal in position, and according to the second pulse direct current signal to determine output power turn-on cycle signal;
One power switch component, for controlling the electric power turn-on cycle signal of IC and the direct current power signal of this filter unit in order to obtain this pulse-width modulation, and according to electric power turn-on cycle signal to cut apart the direct current power signal as a plurality of continuous voltage pulse wave signals, by this continuous voltage pulse wave signal;
One voltage transformation unit, corresponding each voltage pulse signal receives continuous voltage pulse wave signal, and complies with the input voltage start output voltage of each voltage pulse signal;
One low frequency filtering unit is located between these rectification unit output the two poles of the earth, and the voltage and the electric current that input to this pulse-width modulation control IC in order to adjustment are homophase;
One first, second compensating network, consisted of by the current compensation end that is connected respectively to this pulse-width modulation control IC and the RC circuit of voltage compensation end, for the current gain value of controlling IC in order to reduce this pulse-width modulation, make this pulse-width modulation control IC can't see the peak-peak waveform in each work period, avoid this pulse-width modulation control IC to produce unwanted action.
2. power factor correction circuit as claimed in claim 1, it is characterized in that, this power factor correction circuit further be provided with one detect the auxiliary winding of side in order to cooperate this voltage transformation unit to feedback to detect side voltage to this pulse-width modulation control IC for this pulse-width modulation control IC internal reference voltage relatively, use and reach the function of deciding voltage.
3. power factor correction circuit as claimed in claim 1 or 2, it is characterized in that, this power factor correction circuit is further detectd at the electric current of this pulse-width modulation control IC and is provided with a usefulness between side and this voltage controlled element so that more specifically phase compensation unit of this first, second compensating network effect.
4. power factor correction circuit as claimed in claim 2 is characterized in that, this phase compensation unit is that the RC circuit that an electric current that is connected in this pulse-width modulation control IC is detectd between side and this voltage controlled element consists of.
5. such as claim 1 or described power factor correction circuit, it is characterized in that, the electric current of this pulse-width modulation control IC is detectd and is parallel with one between side and this voltage controlled element for the impedance component of adjusting this pulse-width modulation control IC peak power output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102925643A CN103036417A (en) | 2011-09-30 | 2011-09-30 | Power factor improved circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102925643A CN103036417A (en) | 2011-09-30 | 2011-09-30 | Power factor improved circuit |
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| CN103036417A true CN103036417A (en) | 2013-04-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578799A (en) * | 2014-12-25 | 2015-04-29 | 成都芯源系统有限公司 | Switching power supply system and control circuit and control method thereof |
| CN106953535A (en) * | 2017-04-14 | 2017-07-14 | 合肥工业大学 | A kind of model-free Poewr control method of PFC AC/DC converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060056204A1 (en) * | 2004-09-16 | 2006-03-16 | Ta-Yung Yang | Switching control circuit for primary-side controlled power converters |
| US20070268641A1 (en) * | 2006-05-18 | 2007-11-22 | Jo-Chien Kuo | Primary side control module and method for protection of MOSFET against burnout |
| CN101252318A (en) * | 2007-05-22 | 2008-08-27 | 崇贸科技股份有限公司 | Power supply converter containing pulse-width modulation controller for compensation of maximum output power |
-
2011
- 2011-09-30 CN CN2011102925643A patent/CN103036417A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060056204A1 (en) * | 2004-09-16 | 2006-03-16 | Ta-Yung Yang | Switching control circuit for primary-side controlled power converters |
| US20070268641A1 (en) * | 2006-05-18 | 2007-11-22 | Jo-Chien Kuo | Primary side control module and method for protection of MOSFET against burnout |
| CN101252318A (en) * | 2007-05-22 | 2008-08-27 | 崇贸科技股份有限公司 | Power supply converter containing pulse-width modulation controller for compensation of maximum output power |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578799A (en) * | 2014-12-25 | 2015-04-29 | 成都芯源系统有限公司 | Switching power supply system and control circuit and control method thereof |
| CN104578799B (en) * | 2014-12-25 | 2017-04-12 | 成都芯源系统有限公司 | Switching power supply system and control circuit and control method thereof |
| CN106953535A (en) * | 2017-04-14 | 2017-07-14 | 合肥工业大学 | A kind of model-free Poewr control method of PFC AC/DC converters |
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Application publication date: 20130410 |