CN203387408U - Flyback switch power supply circuit - Google Patents
Flyback switch power supply circuit Download PDFInfo
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- CN203387408U CN203387408U CN201320479246.2U CN201320479246U CN203387408U CN 203387408 U CN203387408 U CN 203387408U CN 201320479246 U CN201320479246 U CN 201320479246U CN 203387408 U CN203387408 U CN 203387408U
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- reverse exciting
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- 238000005457 optimization Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000005669 field effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
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Abstract
A flyback switch power supply circuit is disclosed. The flyback switch power supply circuit comprises a flyback switch circuit, an output filter circuit, a control circuit and a total harmonic distortion optimization circuit, wherein the input terminal of the flyback switch circuit and the output terminal of the control circuit as well as an input AC voltage are rectified and then are in power connection, and the output terminal is connected with the input terminal of the output filter circuit; the input terminal of the output filter circuit is connected with the output terminal of the flyback switch circuit, and the output terminal is connected with a load circuit; the input terminal of the control circuit is connected with the output terminal of the total harmonic distortion optimization circuit, and the output terminal is connected with the input terminal of the flyback switch circuit; and the input terminal of the total harmonic distortion optimization circuit and the input AC voltage are rectified and then are in power connection, and the output terminal is connected with the input terminal of the control circuit.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of reverse exciting switching voltage regulator circuit.
Background technology
At present, light-emitting diode (LED) technology reaches its maturity.There are the characteristics such as luminous efficiency is high, long service life due to LED, so that it replaces traditional incandescent lamp at lighting field is very urgent.But, in the existing scheme of the Switching Power Supply for low-power LEDs such as Lamp cup, fluorescent tube, the shortcoming such as the ubiquity power factor is low, harmonic component is high.Cause the problems such as harmonic energy in electrical network is large, energy utilization rate is low, loss is large for low power factor, the higher harmonic wave component of the Switching Power Supply scheme of low-power LED, thereby increased the weight of the electrical network burden.
The utility model content
One or more problems in view of the above, the utility model provides a kind of reverse exciting switching voltage regulator circuit of novelty.
Comprise flyback switching circuit, output filter circuit, control circuit and total harmonic distortion optimization circuit according to the reverse exciting switching voltage regulator circuit of embodiment of the present utility model.Wherein, the input of flyback switching circuit is connected with input ac voltage power supply after rectification with the output of control circuit, and output is connected with the input of output filter circuit; The input of output filter circuit is connected with the output of flyback switching circuit, and output is connected with load circuit; The input of control circuit is connected with the output of total harmonic distortion optimization circuit, and output is connected with the input of flyback switching circuit; The input of total harmonic distortion optimization circuit is connected with input ac voltage power supply after rectification, and output is connected with the output of control circuit.
In the reverse exciting switching voltage regulator circuit according to embodiment of the present utility model, by the total harmonic distortion optimization circuit, can make the phase difference between the input voltage of the input voltage of control circuit and whole reverse exciting switching voltage regulator circuit dwindle, and the current ripples of the input by control circuit can compensate the wave distortion of the input current of whole reverse exciting switching voltage regulator circuit, thereby improves the power factor of whole reverse exciting switching voltage regulator circuit and reduce its harmonic component.
The accompanying drawing explanation
From below in conjunction with accompanying drawing to the description of embodiment of the present utility model, understanding better the utility model, wherein:
Fig. 1 shows according to the circuit diagram of embodiment reverse exciting switching voltage regulator circuit of the present utility model (wherein, load circuit is exemplarily illustrated as LED lamp string).
Embodiment
Below will describe feature and the exemplary embodiment of the utility model various aspects in detail.Many details have been contained in following description, in order to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can in the situation that some details in not needing these details implement.To the description of embodiment, be below only in order to provide the clearer understanding of the utility model by example of the present utility model is shown.The utility model never is limited to the following any concrete configuration proposed, but has covered any modification, replacement and the improvement of coherent element or parts under the prerequisite that does not break away from spirit of the present utility model.
Fig. 1 shows the line map according to the reverse exciting switching voltage regulator circuit of embodiment of the present utility model.It should be noted that, according to the reverse exciting switching voltage regulator circuit of embodiment of the present utility model, can be widely used in various loads drivings field.
Yet for convenience of description, Fig. 1 take that to be applied to LED lamp string be example, and the reverse exciting switching voltage regulator circuit according to embodiment of the present utility model is described.Certainly, it will be understood by those skilled in the art that reverse exciting switching voltage regulator circuit of the present utility model never only limits to be applicable to driving LED.Here, be based on common circuit of reversed excitation exploitation according to the reverse exciting switching voltage regulator circuit of embodiment of the present utility model.
As shown in Figure 1, comprise flyback switching circuit 1, output filter circuit 2, control circuit 3 and total harmonic distortion (Total Harmonic Distortion, THD) optimized circuit 4 according to the reverse exciting switching voltage regulator circuit of embodiment of the present utility model.Wherein, the input of flyback switching circuit 1 is connected with input ac voltage power supply after rectification with the output of control circuit 3, and output is connected with the input of output filter circuit 2; The input of output filter circuit 2 is connected with the output of flyback switching circuit 1, and output is connected with load circuit; The input of control circuit 3 is connected with the output of THD optimized circuit 4, and output is connected with the input of flyback switching circuit 1; The input of THD optimized circuit 4 is connected with input ac voltage power supply after rectification, and output is connected with the output of control circuit 3.
In an embodiment of the present utility model, flyback switching circuit 1 comprises filter capacitor C1, flyback transformer T1, mos field effect transistor (MOSFET) Q1, absorption diode D1, absorption resistance R1 and Absorption Capacitance C2.
In an embodiment of the present utility model, output filter circuit 2 comprises output rectifier diode D2 and two major parts of filter capacitor C3.For different output ripple requirements, output filter circuit 2 can also comprise π type filter circuit or common mode filtering circuit.
In an embodiment of the present utility model, control circuit 3 is mainly that main control element forms by pulse-width modulation (PWM) chip U1, for driving the MOSFETQ1 of flyback switching circuit 1.Wherein, PWM chip U1 comprises an input pin and an output pin, this input pin be the loop compensation pin (be the COMP pin, this COMP pin with the output of THD optimized circuit 4, be connected and external capacitor C4 to ground), this output pin is connected with the source electrode of MOSFET Q1 in flyback switching circuit 1.
In an embodiment of the present utility model, THD optimized circuit 4 comprises resistance R 2, R3 and capacitor C 5.Wherein, resistance R 2 one ends are connected to the anode (this end of R2 and the anode of C1 all are connected with input ac voltage power supply after rectification) of the capacitor C 1 in flyback switching circuit 1, and the other end is connected to an end of resistance R 3, and the other end of resistance R 3 is connected to ground; Connected node between R2 and R3 is connected to an end of capacitor C 5, and the other end of capacitor C 5 is connected to the COMP pin (that is, the input of control circuit 3) of the PWM chip U1 in control circuit 3.Optimize circuit 4 by THD and can make the phase difference between COMP pin and input voltage dwindle, and can compensate the wave distortion of input current by the ripple of COMP pin, thereby improve power factor, reduce harmonic component.
Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not break away from the spirit and scope of the present utility model that limited by claim or its equivalent.
Claims (7)
1. a reverse exciting switching voltage regulator circuit, comprise flyback switching circuit, output filter circuit, control circuit and total harmonic distortion optimization circuit, wherein:
The input of flyback switching circuit is connected with input ac voltage power supply after rectification with the output of control circuit, and output is connected with the input of output filter circuit;
The input of output filter circuit is connected with the output of flyback switching circuit, and output is connected with load circuit;
The input of control circuit is connected with the output of total harmonic distortion optimization circuit, and output is connected with the input of flyback switching circuit; And
The input of total harmonic distortion optimization circuit is connected with input ac voltage power supply after rectification, and output is connected with the input of control circuit.
2. reverse exciting switching voltage regulator circuit according to claim 1, it is characterized in that, described total harmonic distortion optimization circuit comprises two resistance and an electric capacity, wherein, described two resistance are connected in series in input ac voltage after rectification between VDD-to-VSS, and the connected node between described two resistance is connected to an end of a described electric capacity, and the other end of a described electric capacity is connected to the input of described control circuit.
3. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described output filter circuit comprises output rectifier diode and filter capacitor.
4. reverse exciting switching voltage regulator circuit according to claim 3, is characterized in that, described output filter circuit also comprises π type filter circuit or common mode filtering circuit.
5. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described control circuit comprises pulse width modulating chip.
6. reverse exciting switching voltage regulator circuit according to claim 5, it is characterized in that, the input pin of described pulse width modulating chip is connected with the output of described total harmonic distortion optimization circuit and external capacitor arrives ground, and the output pin of described pulse width modulating chip is connected with the input of described flyback switching circuit.
7. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described flyback switching circuit comprises filter capacitor, flyback transformer, mos field effect transistor, absorption diode, absorption resistance and Absorption Capacitance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320479246.2U CN203387408U (en) | 2013-08-06 | 2013-08-06 | Flyback switch power supply circuit |
| TW102217093U TWM478284U (en) | 2013-08-06 | 2013-09-11 | Flyback switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320479246.2U CN203387408U (en) | 2013-08-06 | 2013-08-06 | Flyback switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387408U true CN203387408U (en) | 2014-01-08 |
Family
ID=49875856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320479246.2U Expired - Lifetime CN203387408U (en) | 2013-08-06 | 2013-08-06 | Flyback switch power supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203387408U (en) |
| TW (1) | TWM478284U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242693A (en) * | 2014-10-10 | 2014-12-24 | 无锡优为照明科技有限公司 | Compensating circuit capable of reducing current harmonic distortion of switching power supply |
-
2013
- 2013-08-06 CN CN201320479246.2U patent/CN203387408U/en not_active Expired - Lifetime
- 2013-09-11 TW TW102217093U patent/TWM478284U/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242693A (en) * | 2014-10-10 | 2014-12-24 | 无锡优为照明科技有限公司 | Compensating circuit capable of reducing current harmonic distortion of switching power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM478284U (en) | 2014-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |