CN204145291U - Improve power factor circuit - Google Patents
Improve power factor circuit Download PDFInfo
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- CN204145291U CN204145291U CN201420535775.4U CN201420535775U CN204145291U CN 204145291 U CN204145291 U CN 204145291U CN 201420535775 U CN201420535775 U CN 201420535775U CN 204145291 U CN204145291 U CN 204145291U
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- diode
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- accumulator
- power factor
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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 one that the utility model provides improves power factor circuit, by rectification circuit, afterflow inductance, accumulator, the closed-loop path of transformer and switching circuit composition, there is such feature: rectification circuit is connected with afterflow inductance, afterflow inductance is connected with accumulator, accumulator is connected with transformer, transformer is connected with switching circuit, ground connection respectively with rectification circuit, accumulator is connected with switching circuit, when switching circuit conducting, electric current flows through afterflow inductive energy storage by rectification circuit, when switching circuit ends, the electric current flowing through afterflow inductance afterflow inductance is charged by accumulator.
Description
Technical field
The utility model relates to a kind of circuit of power factor correction, particularly a kind of raising power factor circuit of High Power Factor low cost.
Background technology
Existing LED drives and usually adopts the topological structure such as flyback (Flyback) or step-down (buck), there is the advantages such as structure is simple, with low cost, good constant current effect can be obtained by former limit feedback, but power factor is low, adopt and fill out the power factor that paddy circuit can only obtain 0.9, cannot meet the demands.Usual employing integrated power factor correcting (PFC) improves the power factor of circuit, but the result brought is that the current ripples electric current exported is large, slowly, the output light of light fixture has stroboscopic effect in feedback control loop response, causes the bottleneck problem that power factor and ripple current cannot get both.In order to improve power factor and reduce ripple current, reliable method adopts independent double stage conversion circuit, but high cost, cannot penetration and promotion.
Utility model content
The utility model carries out to solve the problem, and object is to provide the raising power factor circuit that a kind of circuit structure is simple, cost is low.
The one that the utility model provides improves power factor circuit, by rectification circuit, afterflow inductance, accumulator, the closed-loop path of transformer and switching circuit composition, there is such feature: rectification circuit is connected with afterflow inductance, afterflow inductance is connected with accumulator, accumulator is connected with transformer, transformer is connected with switching circuit, ground connection respectively with rectification circuit, accumulator is connected with switching circuit, when switching circuit conducting, electric current flows through afterflow inductive energy storage by rectification circuit, when switching circuit ends, the electric current flowing through afterflow inductance afterflow inductance is charged by accumulator.
The one that the utility model provides improves power factor circuit, also there is such feature: wherein, rectification circuit is connected to form by the first diode, the second diode, the 3rd diode and the 4th diode, the negative pole of the first diode is connected with the negative pole of the 3rd diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the positive pole of the 4th diode is connected with the positive pole of the second diode, and the negative pole of the second diode is connected with the positive pole of the first diode.
The one that the utility model provides improves power factor circuit, also there is such feature: wherein, accumulator is by the first capacitor, second capacitor, 5th diode, 6th diode, 7th diode and resistance connect to form, the positive pole of the first capacitor is connected with the negative pole of the 7th diode, the positive pole of the 7th diode is connected with one end of resistance with the positive pole of the second capacitor respectively, the negative pole of the second capacitor is connected with the positive pole of the 5th diode, the other end of resistance is connected with the negative pole of the 6th diode, the negative pole of the 5th diode is connected with the negative pole of the first capacitor with the positive pole of the 6th diode respectively.
One that the utility model provides improves power factor circuit, also has such feature: wherein, and switching circuit provides the common elements in loop for accumulator and transformer.
The one that the utility model provides improves power factor circuit, also has such feature: wherein, and accumulator adopts two capacitances in series charging, parallel discharge structure.
Utility model effect
Power factor circuit is improved involved by the utility model, be in series with switching circuit, when switching circuit conducting, electric current flows through afterflow inductive energy storage by rectification circuit, when switching circuit ends, the electric current flowing through afterflow inductance afterflow inductance is charged by accumulator, thus improves the input power factor of circuit, effectively reduce output ripple electric current, ripple current is less than or equal to 10%.Adopt this translation circuit, reduce components and parts usage quantity, thus reduce light stroboscopic effect, simplify circuit structure, reduce product cost.There is good loop response simultaneously, without overshoot current, be applicable to step-down (buck), topological structure such as boosting (boost), flyback (Flyback) etc., be widely used.
Accompanying drawing explanation
Fig. 1 is the connection diagram of the utility model raising power factor circuit in an embodiment.
Embodiment
Referring to accompanying drawing reality and execute example the raising power factor circuit involved by the utility model is explained in detail.
Embodiment
Fig. 1 is the connection diagram of the utility model raising power factor circuit in an embodiment.
As shown in Figure 1, the closed-loop path that power factor circuit 100 is made up of rectification circuit 10, commutation condenser C1, afterflow inductance L, accumulator 20, transformer T1 and switching circuit 30 is improved.
Rectification circuit 10 comprises: the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.Rectification circuit 10 is connected to form by above-mentioned four diodes.
The negative pole of the first diode D1 is connected with the negative pole of the 3rd diode D3, the positive pole of the 3rd diode D3 is connected with the negative pole of the 4th diode D4, the positive pole of the 4th diode D4 is connected with the positive pole pole of the second diode D2, and the negative pole of the second diode D2 is connected with the positive pole of the first diode D1.
Commutation condenser C1 and rectification circuit 10 are in parallel.
Afterflow inductance L is connected between rectification circuit 10 and accumulator 20.
Accumulator 20 adopts two capacitances in series charging, parallel discharge structure, and comprise: the first capacitor C2, the second capacitor C3, the 5th diode D5, the 6th diode D6, the 7th diode D7 and resistance R connect to form.
The positive pole of the first capacitor C2 is connected with the negative pole of the 7th diode D7, the positive pole of the 7th diode D7 is connected with one end of resistance R with the positive pole of the second capacitor C3 respectively, the negative pole of the second capacitor C3 is connected with the positive pole of the 5th diode D5, the other end of resistance R is connected with the negative pole of the 6th diode D6, and the negative pole of the 5th diode D5 is connected with the negative pole of the first capacitor C2 with the positive pole of the 6th diode D6 respectively.
Transformer T1 is connected with accumulator 20.
Switching circuit 30 adopts switching tube Q1, is connected between commutation condenser C1 and transformer T1.
Electric main holds input by L, N, through rectification circuit 20 rectification of diode first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 composition, be connected to one end of afterflow inductance L, energy storage inductor 30 other end be connected to switching circuit 30 by transformer T1, be connected to by the first capacitor C2, the second capacitor C3, the accumulator 20 that the 5th diode D5, the 6th diode D6, the 7th diode D7 and resistance R form simultaneously.When switching circuit 30 conducting, electric current forms loop through afterflow inductance L and transformer T1, when switching circuit 30 cuts out, afterflow inductance L is charged to the first capacitor C2 and the second capacitor C3 by the 6th diode D6 and resistance R, during charging, loop is formed by the first capacitor C2, the 6th diode D6, resistance R and the second capacitor C3, complete the serial connection charge of the first capacitor C2 and the second capacitor C3, during electric discharge, form shunt circuit by the first capacitor C2, the 5th diode D5, the second capacitor C33 and the 7th diode D7 and complete electric discharge.
The effect of embodiment and effect
Power factor circuit is improved involved by the present embodiment, switching circuit provides the common elements in loop for energy storage inductor and transformer, accumulator adopts two capacitances in series charging, parallel discharge structure, uses and can improve line power factor together with afterflow inductance L.Can not only improve the input power factor of circuit, make it be more than or equal to 0.93, and effectively reduce output ripple electric current, ripple current is less than or equal to 10%.This circuit application is in single stage shift circuit, and power switch pipe Q1 shares, and reduces components and parts usage quantity, thus reduces light stroboscopic effect, simplifies circuit structure, reduces product cost.There is good loop response simultaneously, without overshoot current, be applicable to the topological structures such as step-down (buck), boosting (boost), counterattack (Flyback), be widely used.
Above-mentioned execution mode is preferred case of the present utility model, is not used for limiting protection range of the present utility model.
Claims (5)
1. improve a power factor circuit, the closed-loop path be made up of rectification circuit, afterflow inductance, accumulator, transformer and switching circuit, is characterized in that:
Described rectification circuit is connected with described afterflow inductance described afterflow inductance, be connected with described accumulator, described accumulator is connected with described transformer, described transformer is connected with described switching circuit, ground connection is connected with described switching circuit with described rectification circuit, described accumulator respectively
When described switching circuit conducting, electric current flows through described afterflow inductive energy storage by described rectification circuit, and when described switching circuit cut-off, the described electric current flowing through described afterflow inductance is charged by described accumulator.
2. raising power factor circuit according to claim 1, is characterized in that:
Wherein, rectification circuit is connected to form by the first diode, the second diode, the 3rd diode and the 4th diode,
The negative pole of described first diode is connected with the negative pole of described 3rd diode, the positive pole of described 3rd diode is connected with the negative pole of described 4th diode, the positive pole of described 4th diode is connected with the positive pole of described second diode, and the negative pole of described second diode is connected with the positive pole of described first diode.
3. raising power factor circuit according to claim 1, is characterized in that:
Wherein, described accumulator is connected to form by the first capacitor, the second capacitor, the 5th diode, the 6th diode, the 7th diode and resistance,
The positive pole of described first capacitor is connected with the negative pole of described 7th diode, the positive pole of described 7th diode is connected with one end of described resistance with the positive pole of described second capacitor respectively, the negative pole of described second capacitor is connected with the positive pole of described 5th diode, the other end of described resistance is connected with the negative pole of described 6th diode, and the negative pole of described 5th diode is connected with the negative pole of described first capacitor with the positive pole of described 6th diode respectively.
4. raising power factor circuit according to claim 1, is characterized in that:
Wherein, described switching circuit provides the common elements in loop for described accumulator and described transformer.
5. raising power factor circuit according to claim 1, is characterized in that:
Wherein, described accumulator adopts two capacitances in series charging, parallel discharge structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420535775.4U CN204145291U (en) | 2014-09-17 | 2014-09-17 | Improve power factor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420535775.4U CN204145291U (en) | 2014-09-17 | 2014-09-17 | Improve power factor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204145291U true CN204145291U (en) | 2015-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420535775.4U Expired - Fee Related CN204145291U (en) | 2014-09-17 | 2014-09-17 | Improve power factor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204145291U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020082701A1 (en) * | 2018-10-26 | 2020-04-30 | 苏州菲达旭微电子有限公司 | Half-voltage power supply ripple-free led circuit |
-
2014
- 2014-09-17 CN CN201420535775.4U patent/CN204145291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020082701A1 (en) * | 2018-10-26 | 2020-04-30 | 苏州菲达旭微电子有限公司 | Half-voltage power supply ripple-free led circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 Termination date: 20170917 |