CN203708102U - Power factor compensation circuit for buck circuit - Google Patents
Power factor compensation circuit for buck circuit Download PDFInfo
- Publication number
- CN203708102U CN203708102U CN201420019077.9U CN201420019077U CN203708102U CN 203708102 U CN203708102 U CN 203708102U CN 201420019077 U CN201420019077 U CN 201420019077U CN 203708102 U CN203708102 U CN 203708102U
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- China
- Prior art keywords
- circuit
- power factor
- output
- adder
- factor compensation
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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 power factor compensation circuit for a buck circuit. The power factor compensation circuit for the buck circuit includes input alternating current voltage (101), a rectifying circuit (102), an amplifying circuit (118) and a stability control circuit (117). Signals are transmitted to a primary side through the stability control circuit (117) and an isolator (109); direct current output signals and alternating current rectification signals (103) of the isolator (109) are added in an adder (116); and output signals of the adder (116) are inputted to a comparator (107) so as to be compared with current signals outputted by and an increase/decrease circuit (113). Compared with a multiplier power factor compensation circuit in the prior art, the adder power factor compensation control circuit has the advantages of simplicity and easiness in design, and ahs the same power factor compensation effect; a control part of the power factor compensation circuit can be greatly simplified, and therefore, design difficulty and cost can be reduced, and the reliability of the product can be improved.
Description
Technical field
The utility model relates to circuit engineering field, especially relates to a kind of for reduction voltage circuit compensation of power factor circuit.
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.
Utility model content
Goal of the invention of the present utility model is: for the problem of above-mentioned existence, provide a kind of for reduction voltage circuit compensation of power factor circuit, with the typical multiplier power factor compensation circuit of adder power factor compensation control circuit replacement prior art.
The technical solution adopted in the utility model is such: 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.
In sum, owing to having adopted technique scheme, the beneficial effects of the utility model are: adopt adder power factor compensation control circuit to have feature simple and that easily design compared with the typical multiplier power factor compensation circuit of prior art, and have 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
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is the circuit diagram that adopts switch signal generator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
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.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (1)
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).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019077.9U CN203708102U (en) | 2014-01-09 | 2014-01-09 | Power factor compensation circuit for buck circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019077.9U CN203708102U (en) | 2014-01-09 | 2014-01-09 | Power factor compensation circuit for buck circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203708102U true CN203708102U (en) | 2014-07-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420019077.9U Expired - Fee Related CN203708102U (en) | 2014-01-09 | 2014-01-09 | Power factor compensation circuit for buck circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203708102U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904879A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Compensating circuit and method for buck circuit power factor |
-
2014
- 2014-01-09 CN CN201420019077.9U patent/CN203708102U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904879A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Compensating circuit and method for buck circuit power factor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: CHANGZHOU LONGHUI LIGHTING SCIENCE & TECHNOLOGY CO., LTD. Document name: Notification of Termination of Patent Right |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20160109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |