CN103904879A - Compensating circuit and method for buck circuit power factor - Google Patents
Compensating circuit and method for buck circuit power factor Download PDFInfo
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- CN103904879A CN103904879A CN201410014293.9A CN201410014293A CN103904879A CN 103904879 A CN103904879 A CN 103904879A CN 201410014293 A CN201410014293 A CN 201410014293A CN 103904879 A CN103904879 A CN 103904879A
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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 provides a compensating circuit and method for a buck circuit power factor. The compensating circuit comprises input alternating-current voltage (101), a rectifying circuit (102), an amplification circuit (118) and a stability control circuit (117), the stability control circuit (117) and an isolator (109) are sent to a primary side, the direct-current output signals and alternating-current rectified signals (103) of the isolator (109) are added in a summator (116), and the output signals of the summator (116) are input into a comparator (107) to be compared with current signals output by an increasing/reducing circuit (113). The compensating circuit and method have the advantages that compared with a typical multiplying unit power factor compensating circuit in the prior art, a summator power factor compensating control circuit has the advantages of being simple and easy to design, and the same power factor compensating effect is achieved. The design of the control portion of the compensating circuit can be greatly simplified, and therefore design difficulty and cost are lowered, and product reliability is improved.
Description
Technical field
The present invention relates to circuit engineering field, especially relate to a kind of for reduction voltage circuit compensation of power factor circuit and method thereof.
Background technology
Power factor is the phase place of electric current to voltage and the measurement index of electric current distortion thereof in sinusoidal ac.For example as 220V or 110V electrical network.When the waveform of electric current identical with voltage not leading or while lagging behind (phase difference), power factor now be maximum, 1 or 100%.Be less than 1 power factor and mean that some is not made to use up from the electricity in power station arrives user, but returned to power station, this part is called reactive power.Its reactive power that power factor is lower is higher.Reactive power is proportional with active power by power factor size.Therefore in order to meet user's demand, the namely demand to active power, power station must be transmitted extra reactive power in proportion.Result has not only caused the excess loss of electric power on power transmission line, and the actual active power in power station uses capacity to be also reduced in addition.So a lot of products all have minimum requirement to power factor.In order to meet the requirement of power factor, usually need extra circuit to carry out calibration and compensation to power factor, to improve power factor.
Common have a flyback topology (Flyback), boost (Boost), and (Buck-Boost) etc. pressed in falling-rising for power factor calibration.And in some applications, such as LED drives, step-down (Buck) and forward direction circuit (Forward) are used more and morely, this is because reduction voltage circuit has higher efficiency.
Summary of the invention
It is a kind of for reduction voltage circuit compensation of power factor circuit that the technical problem that the present invention solves is to provide, with the typical multiplier power factor compensation circuit of adder power factor compensation control circuit replacement prior art.
In order to overcome the above problems, the invention provides a kind of for reduction voltage circuit compensation of power factor circuit, comprise input ac voltage 101, rectification circuit 102, amplifying circuit 118 and control stability circuit 117, wherein input ac voltage 101 is connected with rectification circuit 102, the positive pole of rectification circuit 102 outputs successively with adder 116, diode 110 and inductance 105) one end be connected, the negative pole of rectification circuit 102 outputs is connected with the input of current sampler 401, a wherein output of current sampler 401 is extremely connected with the S of switch element 106, the D utmost point of switch element 106 is connected with the input of the other end of diode 110 and one end of electric capacity 111 and sampling resistor 112 successively, the two ends of sampling resistor 112 are connected respectively at the input of amplifying circuit 118, the output of amplifying circuit 118 is connected with the input of control stability circuit 117, the output of control stability circuit 117 is connected with isolator 109, the output of isolator 109 is connected with another input of adder 116, another output of current sampler 401 is connected with the negative pole of comparator 107 by increasing/reduce circuit 108, the output of adder 116 is connected with the positive pole of comparator 107, the output of comparator 107 is extremely connected with the G of switch element 106.
For reduction voltage circuit compensation of power factor method be wherein: on current sampling resistor 112, form feedback voltage proportional to output current, this signal is after amplifying circuit 118, be sent to former limit by control stability circuit 117 and isolator 109, the direct-flow output signal of isolator 109 and AC rectification signal 103 are added in adder 116, and the output signal of adder 116 is imported into comparator 107 and increases/reduce compared with the current signal exported of circuit 113; When switch element 106 conducting, the output that increases/reduce circuit 113 also increases, in the time that the output of increase/minimizing circuit 113 reaches the default comparison signal value of output of adder 116, switch element 106 turn-offs, the output that increases/reduce circuit 113 reduces gradually, through certain delay or reach the regular hour when interval, switch element 106 conducting again.The electric current of switch element 106 increases again
In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows: the present invention adopts has the simple and easy feature of design compared with the typical multiplier power factor compensation circuit of adder power factor compensation control circuit and prior art, and has same power factor compensation effect.The design of its control section can be simplified greatly, has reduced thus design difficulty and cost, has also improved the reliability of product.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the present invention and easily learn wherein many advantages of following, accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is the circuit diagram that adopts switch signal generator.
Embodiment
Referring to figure, embodiments of the invention are described.
For above-mentioned purpose, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
As shown in Figure 1, comprise input ac voltage 101, rectification circuit 102, amplifying circuit 118 and control stability circuit 117, wherein input ac voltage 101 is connected with rectification circuit 102, the positive pole of rectification circuit 102 outputs successively with adder 116, diode 110 and inductance 105) one end be connected, the negative pole of rectification circuit 102 outputs is connected with the input of current sampler 401, a wherein output of current sampler 401 is extremely connected with the S of switch element 106, the D utmost point of switch element 106 is connected with the input of the other end of diode 110 and one end of electric capacity 111 and sampling resistor 112 successively, the two ends of sampling resistor 112 are connected respectively at the input of amplifying circuit 118, the output of amplifying circuit 118 is connected with the input of control stability circuit 117, the output of control stability circuit 117 is connected with isolator 109, the output of isolator 109 is connected with another input of adder 116, another output of current sampler 401 is connected with the negative pole of comparator 107 by increasing/reduce circuit 108, the output of adder 116 is connected with the positive pole of comparator 107, the output of comparator 107 is extremely connected with the G of switch element 106.
For reduction voltage circuit compensation of power factor method be wherein: on current sampling resistor 112, form feedback voltage proportional to output current, this signal is after amplifying circuit 118, be sent to former limit by control stability circuit 117 and isolator 109, the direct-flow output signal of isolator 109 and AC rectification signal 103 are added in adder 116, and the output signal of adder 116 is imported into comparator 107 and increases/reduce compared with the current signal exported of circuit 113; When switch element 106 conducting, the output that increases/reduce circuit 113 also increases, in the time that the output of increase/minimizing circuit 113 reaches the default comparison signal value of output of adder 116, switch element 106 turn-offs, the output that increases/reduce circuit 113 reduces gradually, through certain delay or reach the regular hour when interval, switch element 106 conducting again.The electric current of switch element 106 increases again.
As shown in Figure 2, the another kind of voltage reducing power-factor compensating circuit that adopts adder control.This compensating circuit has removed current sampler (401), directly utilizes input voltage waveform to produce and is similar in Fig. 1 the output waveform that increases/reduce circuit 108, compares and produces switching signal with the output of adder 116.Switch signal generator 200 in Fig. 2 combines these functions, has produced switching signal.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (2)
1. one kind for reduction voltage circuit compensation of power factor circuit, comprise input ac voltage (101), rectification circuit (102), amplifying circuit (118) and control stability circuit (117), it is characterized in that: input ac voltage (101) is connected with rectification circuit (102), the positive pole of rectification circuit (102) output successively with adder (116), diode (110) is connected with one end of inductance (105), the negative pole of rectification circuit (102) output is connected with the input of current sampler (401), a wherein output of current sampler (401) is extremely connected with the S of switch element (106), the D utmost point of switch element (106) is connected with the input of the other end of diode (110) and one end of electric capacity (111) and sampling resistor (112) successively, the two ends of sampling resistor (112) are connected respectively at the input of amplifying circuit (118), the output of amplifying circuit (118) is connected with the input of control stability circuit (117), the output of control stability circuit (117) is connected with isolator (109), the output of isolator (109) is connected with another input of adder (116), another output of current sampler (401) is connected with the negative pole of comparator (107) by increasing/reduce circuit (108), the output of adder (116) is connected with the positive pole of comparator (107), the output of comparator (107) is extremely connected with the G of switch element (106).
2. a kind of for reduction voltage circuit compensation of power factor method as claimed in claim 1, it is characterized in that: at the upper formation of current sampling resistor (112) feedback voltage proportional to output current, this signal is after amplifying circuit (118), be sent to former limit by control stability circuit (117) and isolator (109), the direct-flow output signal of isolator (109) and AC rectification signal (103) are added in adder (116), compared with the output signal of adder (116) is imported into comparator (107) and increases/reduce the current signal of circuit (113) output, when switch element (106) conducting, the output that increases/reduce circuit (113) also increases, in the time that the output of increase/minimizing circuit (113) reaches the default comparison signal value of output of adder (116), switch element (106) turn-offs, the output that increases/reduce circuit (113) reduces gradually, through certain delay or reach the regular hour when interval, switch element (106) conducting again.The electric current of switch element (106) increases again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014293.9A CN103904879A (en) | 2014-01-09 | 2014-01-09 | Compensating circuit and method for buck circuit power factor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410014293.9A CN103904879A (en) | 2014-01-09 | 2014-01-09 | Compensating circuit and method for buck circuit power factor |
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| CN103904879A true CN103904879A (en) | 2014-07-02 |
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| CN201410014293.9A Pending CN103904879A (en) | 2014-01-09 | 2014-01-09 | Compensating circuit and method for buck circuit power factor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994620A (en) * | 2014-11-29 | 2015-10-21 | 成都颉盛科技有限公司 | LED bootstrap control system based on step-down constant current |
Citations (6)
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|---|---|---|---|---|
| CN1294445A (en) * | 1999-10-21 | 2001-05-09 | 深圳市华为电气股份有限公司 | Three-phase rectifier with power factor correcting circuit |
| US20060044855A1 (en) * | 2002-09-20 | 2006-03-02 | Albino Pidutti | Power factor correction device for switching power supllies |
| CN101789684A (en) * | 2010-03-05 | 2010-07-28 | 于锁平 | Power factor corrector |
| CN201967214U (en) * | 2011-02-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (light-emitting diode) lamp |
| CN103368372A (en) * | 2012-04-06 | 2013-10-23 | 英飞特电子（杭州）股份有限公司 | Power factor correction circuit |
| CN203708102U (en) * | 2014-01-09 | 2014-07-09 | 常州隆辉照明科技有限公司 | Power factor compensation circuit for buck circuit |
-
2014
- 2014-01-09 CN CN201410014293.9A patent/CN103904879A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294445A (en) * | 1999-10-21 | 2001-05-09 | 深圳市华为电气股份有限公司 | Three-phase rectifier with power factor correcting circuit |
| US20060044855A1 (en) * | 2002-09-20 | 2006-03-02 | Albino Pidutti | Power factor correction device for switching power supllies |
| CN101789684A (en) * | 2010-03-05 | 2010-07-28 | 于锁平 | Power factor corrector |
| CN201967214U (en) * | 2011-02-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (light-emitting diode) lamp |
| CN103368372A (en) * | 2012-04-06 | 2013-10-23 | 英飞特电子（杭州）股份有限公司 | Power factor correction circuit |
| CN203708102U (en) * | 2014-01-09 | 2014-07-09 | 常州隆辉照明科技有限公司 | Power factor compensation circuit for buck circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994620A (en) * | 2014-11-29 | 2015-10-21 | 成都颉盛科技有限公司 | LED bootstrap control system based on step-down constant current |
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