CN103904887A - Self-excited buck circuit and light fixture - Google Patents
Self-excited buck circuit and light fixture Download PDFInfo
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- CN103904887A CN103904887A CN201210580486.1A CN201210580486A CN103904887A CN 103904887 A CN103904887 A CN 103904887A CN 201210580486 A CN201210580486 A CN 201210580486A CN 103904887 A CN103904887 A CN 103904887A
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Abstract
The invention is applied to the field of a light fixture, and especially relates to a self-excited buck circuit and a light fixture. According to the embodiments of the invention, the self-excited buck circuit is composed of an independent type component. The structure is simple and reliable, the cost is low, the working is stable, the problem of differential voltage existing in a conventional buck circuit is solved, the work efficiency of the buck circuit is improved, and the self-excited buck circuit can be adaptive to serving as a simple buck circuit for electronic devices with various external power sources.
Description
Technical field
The invention belongs to field of light fittings, relate in particular to a kind of auto-excitation type reduction voltage circuit and light fixture.
Background technology
Reduction voltage circuit is a kind of basic DC/DC converter, is widely used in various power supply circuits.
In at present a lot of circuit, need to use buck functionality, but general analog circuit is inadaptable for the reduction voltage circuit of larger pressure reduction, and present reduction voltage circuit inefficiency, complex structure.
Summary of the invention
The object of the present invention is to provide a kind of auto-excitation type reduction voltage circuit, be intended to solve present reduction voltage circuit and have the low and baroque problem of pressure reduction, efficiency.
The present invention is achieved in that a kind of auto-excitation type reduction voltage circuit, and described auto-excitation type reduction voltage circuit comprises:
Resistance R 1, resistance R 2, divider resistance R3, divider resistance R4, storage capacitor C1, filter capacitor C2, inductance L 1, diode D1, the first switching tube, second switch pipe and the 3rd switching tube;
The hot end of described the first switching tube is input, the first end of the electronegative potential termination inductance L 1 of described the first switching tube, the second end of described inductance L 1 is output, the hot end of described the first switching tube connects the hot end of the 3rd switching tube by described resistance R 1, the cold end ground connection of described the 3rd switching tube, described storage capacitor C1 is connected between the hot end and cold end of described the 3rd switching tube, the hot end of described second switch pipe connects the control end of the first switching tube by described resistance R 2, the cold end ground connection of described second switch pipe, the hot end of control termination the 3rd switching tube of described second switch pipe, the negative electrode of described diode D1 connects the cold end of the first switching tube, the plus earth of described diode D1, described divider resistance R3 and divider resistance R4 are serially connected between second end and ground of described inductance L 1, the public connecting end of described divider resistance R3 and divider resistance R4 connects the control end of the 3rd switching tube, described filter capacitor C2 is connected between second end and ground of inductance L 1.
Another object of the present invention is to provide a kind of light fixture, described light fixture comprises above-mentioned auto-excitation type reduction voltage circuit.
In the present invention, this auto-excitation type reduction voltage circuit adopts free-standing components and parts to form, simple and reliable for structure, low cost, working stability, solve the problem that present reduction voltage circuit exists pressure reduction, improved reduction voltage circuit operating efficiency, the electronic product that is suitably for various extraneous power supplys does easy reduction voltage circuit.
Brief description of the drawings
Fig. 1 is the structure chart of the auto-excitation type reduction voltage circuit that provides of first embodiment of the invention;
Fig. 2 is the structure chart of the auto-excitation type reduction voltage circuit that provides of second embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of the auto-excitation type reduction voltage circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
A kind of auto-excitation type reduction voltage circuit, described auto-excitation type reduction voltage circuit comprises:
Resistance R 1, resistance R 2, divider resistance R3, divider resistance R4, storage capacitor C1, filter capacitor C2, inductance L 1, diode D1, the first switching tube 100, second switch pipe 200 and the 3rd switching tube 300;
The hot end of described the first switching tube 100 is input, the first end of the electronegative potential termination inductance L 1 of described the first switching tube 100, the second end of described inductance L 1 is output, the hot end of described the first switching tube 100 connects the hot end of the 3rd switching tube 300 by described resistance R 1, the cold end ground connection of described the 3rd switching tube 300, described storage capacitor C1 is connected between the hot end and cold end of described the 3rd switching tube 300, the hot end of described second switch pipe 200 connects the control end of the first switching tube 100 by described resistance R 2, the cold end ground connection of described second switch pipe 200, the hot end of control termination the 3rd switching tube 300 of described second switch pipe 200, the negative electrode of described diode D1 connects the cold end of the first switching tube 100, the plus earth of described diode D1, described divider resistance R3 and divider resistance R4 are serially connected between second end and ground of described inductance L 1, the public connecting end of described divider resistance R3 and divider resistance R4 connects the control end of the 3rd switching tube 300, described filter capacitor C2 is connected between second end and ground of inductance L 1.
As one embodiment of the invention, described the first switching tube 100 adopts positive-negative-positive triode Q1, the base stage of described positive-negative-positive triode Q1 is the control end of the first switching tube 100, the very hot end of the first switching tube 100 of the transmitting of described positive-negative-positive triode Q1, the very cold end of the first switching tube 100 of the current collection of described positive-negative-positive triode Q1.
As one embodiment of the invention, described second switch pipe 200 adopts NPN type triode Q2, the base stage of described NPN type triode Q2 is the control end of second switch pipe 200, the very hot end of second switch pipe 200 of current collection of described NPN type triode Q2, the very cold end of second switch pipe 200 of transmitting of described NPN type triode Q2.
As one embodiment of the invention, described the 3rd switching tube 300 adopts NPN type triode Q3, the base stage of described NPN type triode Q3 is the control end of the 3rd switching tube 300, the very hot end of the 3rd switching tube 300 of current collection of described NPN type triode Q3, the very cold end of the 3rd switching tube 300 of transmitting of described NPN type triode Q3.
Fig. 2 shows the structure of the auto-excitation type reduction voltage circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
As one embodiment of the invention, described the first switching tube 100 adopts P type metal-oxide-semiconductor Q4, the grid of described P type metal-oxide-semiconductor Q4 is the control end of the first switching tube 100, the source electrode of described P type metal-oxide-semiconductor Q4 is the hot end of the first switching tube 100, and the drain electrode of described P type metal-oxide-semiconductor Q4 is the cold end of the first switching tube 100.
As one embodiment of the invention, described second switch pipe 200 adopts N-type metal-oxide-semiconductor Q5, the grid of described N-type metal-oxide-semiconductor Q5 is the control end of second switch pipe 200, the drain electrode of described N-type metal-oxide-semiconductor Q5 is the hot end of second switch pipe 200, and the source electrode of described N-type metal-oxide-semiconductor Q5 is the cold end of second switch pipe 200.
As one embodiment of the invention, described the 3rd switching tube 300 adopts N-type metal-oxide-semiconductor Q6, the grid of described N-type metal-oxide-semiconductor Q6 is the control end of the 3rd switching tube 300, the drain electrode of described N-type metal-oxide-semiconductor Q6 is the hot end of the 3rd switching tube 300, and the source electrode of described N-type metal-oxide-semiconductor Q6 is the cold end of the 3rd switching tube 300.
One embodiment of the invention also comprises a kind of light fixture, and described light fixture comprises above-mentioned auto-excitation type reduction voltage circuit.
Adopt positive-negative-positive triode Q1, second switch pipe 200 to adopt NPN type triode Q2 and the 3rd switching tube 300 to adopt NPN type triode Q3 as example taking the first switching tube 100 below, the operation principle of auto-excitation type reduction voltage circuit be described:
1,, in the time that input powers on, voltage is given storage capacitor C1 charging through resistance R 1, in the time charging to 0.7V, NPN type triode Q2 conducting, drags down positive-negative-positive triode Q1 base stage by resistance R 2, thereby makes positive-negative-positive triode Q1 conducting, reduction voltage circuit work, at output output LOW voltage;
2, output feeds back to NPN type triode Q3 base stage after divider resistance R3, divider resistance R4 dividing potential drop sampling (when R3, R4 value arrange will according to formula: VL*R4/ (R3+R4)=0.7V), make NPN type triode Q3 saturation conduction, make storage capacitor C1 two ends be discharged to 0.3V, NPN type triode Q2 is tending towards cut-off, NPN type triode Q3 also ends, reduction voltage circuit no-output, output is 0V;
3, in the time that output is 0V, NPN type triode Q3 ends again, input is given storage capacitor C1 charging by resistance R 1, repeat the actuation cycle of 1-2 step, the switch that positive-negative-positive triode Q1 is continuous, just there is like this square wave of high/low level at output, after capacitor C 2 smothing filterings, become required direct voltage after filtering.
In embodiments of the present invention, this auto-excitation type reduction voltage circuit adopts free-standing components and parts to form, simple and reliable for structure, low cost, working stability, solve the problem that present reduction voltage circuit exists pressure reduction, improved reduction voltage circuit operating efficiency, the electronic product that is suitably for various extraneous power supplys does easy reduction voltage circuit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. an auto-excitation type reduction voltage circuit, is characterized in that, described auto-excitation type reduction voltage circuit comprises:
Resistance R 1, resistance R 2, divider resistance R3, divider resistance R4, storage capacitor C1, filter capacitor C2, inductance L 1, diode D1, the first switching tube, second switch pipe and the 3rd switching tube;
The hot end of described the first switching tube is input, the first end of the electronegative potential termination inductance L 1 of described the first switching tube, the second end of described inductance L 1 is output, the hot end of described the first switching tube connects the hot end of the 3rd switching tube by described resistance R 1, the cold end ground connection of described the 3rd switching tube, described storage capacitor C1 is connected between the hot end and cold end of described the 3rd switching tube, the hot end of described second switch pipe connects the control end of the first switching tube by described resistance R 2, the cold end ground connection of described second switch pipe, the hot end of control termination the 3rd switching tube of described second switch pipe, the negative electrode of described diode D1 connects the cold end of the first switching tube, the plus earth of described diode D1, described divider resistance R3 and divider resistance R4 are serially connected between second end and ground of described inductance L 1, the public connecting end of described divider resistance R3 and divider resistance R4 connects the control end of the 3rd switching tube, described filter capacitor C2 is connected between second end and ground of inductance L 1.
2. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described the first switching tube adopts positive-negative-positive triode Q1, the base stage of described positive-negative-positive triode Q1 is the control end of the first switching tube, the very hot end of the first switching tube of the transmitting of described positive-negative-positive triode Q1, the very cold end of the first switching tube of the current collection of described positive-negative-positive triode Q1.
3. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described the first switching tube adopts P type metal-oxide-semiconductor Q4, the grid of described P type metal-oxide-semiconductor Q4 is the control end of the first switching tube, the source electrode of described P type metal-oxide-semiconductor Q4 is the hot end of the first switching tube, and the drain electrode of described P type metal-oxide-semiconductor Q4 is the cold end of the first switching tube.
4. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described second switch pipe adopts NPN type triode Q2, the base stage of described NPN type triode Q2 is the control end of second switch pipe, the very hot end of second switch pipe of current collection of described NPN type triode Q2, the very cold end of second switch pipe of transmitting of described NPN type triode Q2.
5. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described second switch pipe adopts N-type metal-oxide-semiconductor Q5, the grid of described N-type metal-oxide-semiconductor Q5 is the control end of second switch pipe, the drain electrode of described N-type metal-oxide-semiconductor Q5 is the hot end of second switch pipe, and the source electrode of described N-type metal-oxide-semiconductor Q5 is the cold end of second switch pipe.
6. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described the 3rd switching tube adopts NPN type triode Q3, the base stage of described NPN type triode Q3 is the control end of the 3rd switching tube, the very hot end of the 3rd switching tube of current collection of described NPN type triode Q3, the very cold end of the 3rd switching tube of transmitting of described NPN type triode Q3.
7. auto-excitation type reduction voltage circuit as claimed in claim 1, it is characterized in that, described the 3rd switching tube adopts N-type metal-oxide-semiconductor Q6, the grid of described N-type metal-oxide-semiconductor Q6 is the control end of the 3rd switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q6 is the hot end of the 3rd switching tube, and the source electrode of described N-type metal-oxide-semiconductor Q6 is the cold end of the 3rd switching tube.
8. a light fixture, is characterized in that, described light fixture comprises the auto-excitation type reduction voltage circuit as described in claim 1-7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210580486.1A CN103904887A (en) | 2012-12-28 | 2012-12-28 | Self-excited buck circuit and light fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210580486.1A CN103904887A (en) | 2012-12-28 | 2012-12-28 | Self-excited buck circuit and light fixture |
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| CN103904887A true CN103904887A (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210580486.1A Pending CN103904887A (en) | 2012-12-28 | 2012-12-28 | Self-excited buck circuit and light fixture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452071A (en) * | 2016-11-22 | 2017-02-22 | 郑州诚合信息技术有限公司 | Power control circuit in wide frequency scale |
| CN107800297A (en) * | 2017-11-13 | 2018-03-13 | 利欧集团浙江泵业有限公司 | A kind of reduction voltage circuit for brush DC intelligent water pump controller |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000004579A (en) * | 1998-06-12 | 2000-01-07 | Matsushita Electric Works Ltd | Self-excited dc-to-dc converter and power supply device therefor |
| CN102820784A (en) * | 2012-05-17 | 2012-12-12 | 浙江工业大学 | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss |
-
2012
- 2012-12-28 CN CN201210580486.1A patent/CN103904887A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000004579A (en) * | 1998-06-12 | 2000-01-07 | Matsushita Electric Works Ltd | Self-excited dc-to-dc converter and power supply device therefor |
| CN102820784A (en) * | 2012-05-17 | 2012-12-12 | 浙江工业大学 | BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106452071A (en) * | 2016-11-22 | 2017-02-22 | 郑州诚合信息技术有限公司 | Power control circuit in wide frequency scale |
| CN106452071B (en) * | 2016-11-22 | 2019-03-22 | 惠州市沃生照明有限公司 | A kind of power control circuit of wide frequency ranges |
| CN107800297A (en) * | 2017-11-13 | 2018-03-13 | 利欧集团浙江泵业有限公司 | A kind of reduction voltage circuit for brush DC intelligent water pump controller |
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Application publication date: 20140702 |