CN2492004Y - Voltage-regulating switching power source - Google Patents
Voltage-regulating switching power source Download PDFInfo
- Publication number
- CN2492004Y CN2492004Y CN 01206556 CN01206556U CN2492004Y CN 2492004 Y CN2492004 Y CN 2492004Y CN 01206556 CN01206556 CN 01206556 CN 01206556 U CN01206556 U CN 01206556U CN 2492004 Y CN2492004 Y CN 2492004Y
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- circuit
- output
- voltage
- power supply
- direct current
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Abstract
The utility model relates to a voltage regulation switch power supply, which comprises a bridge rectifier filtering circuit, a top integrated circuit, a variable pressure filtering circuit, a feedback circuit, an output circuit, a flyback high-frequency transformer and a control circuit, and is characterized in that a tap is arranged on an output winding end of a transformer T1 in the control circuit, thereby achieving the low pressure output, an adjustable resistance R5 is arranged in the control circuit, thereby changing the sampling voltage value of an integrated circuit U1. Through regulating the resistance value of the R5, the pulse width of a high frequency switch circuit is changed, thereby a loading obtains a continuous adjustable stable direct current voltage. The utility model has the advantages of wide input voltage range, direct current output power supply, smooth dimming, high efficiency, reliable working, and is particularly suitable for the light source control of a microscope and a myopia prevention direct current desk lamp.
Description
The utility model relates to a kind of pressure regulation direct-current switch power supply, can be applicable to voltage regulator control circuit, especially is applicable to the tap changer power supply of microscopical light source control and myopia prevention desk lamp with dimmer switch.
At present, public microscopical light modulation power supply adopts the thyristor control technology, by changing the effective value that the angle of flow changes voltage, realizes the purpose of light modulation, and realizes safe voltage output by Industrial Frequency Transformer.Be characterized in that circuit is simple, weak point is: only can be applicable to the univoltage input, product can not normally use under the bigger situation of mains fluctuations, owing to have high order harmonic component and surge current, light has stroboscopic, useful life and other electrical equipment to lamp have certain influence, and volume is big, and efficient is low.
The purpose of this utility model is: provide a kind of volume little, stable performance, but and the direct-current switch power supply of the pressure regulation that can normally use under the bigger situation of voltage fluctuation.
Concrete scheme of the present utility model is: comprise bridge rectifier filter circuit, TOP integrated circuit, transformation filter circuit, feedback circuit, output loop, anti-sharp high frequency transformer, control loop, it is characterized in that: the output winding terminal of the transformer T1 in the control loop is provided with tap, realizes low pressure output; In control loop, be provided with adjustable resistor R5, change the sampling voltage value of integrated circuit U1.
The utility model compared with prior art has following advantage:
1. wide voltage input: when input voltage changed in the AC85-265V scope, the constant of output can be worked and keep to power supply;
2. import the frequency range of power supply: 40-440Hz;
3. direct current output: the light flicker free can prolong useful life of lamp;
4. but pressure regulation: output voltage 1-36V;
5. efficient height, reliable operation;
6. whole power supply can be finished in a printed circuit board, and volume is little, and is easy for installation.
Below in conjunction with accompanying drawing and example the utility model is further specified:
Fig. 1 is a circuit diagram of the present utility model, also is a kind of embodiment of the present utility model, and it is the situation that is used for microscope light source control.
As shown in Figure 1: the utility model is made up of bridge rectifier filter circuit, TOP integrated circuit, transformation filter circuit, feedback circuit, output loop, anti-sharp high frequency transformer, control loop, architectural feature of the present utility model is: the output winding terminal of the transformer T1 in the control loop is provided with tap, realizes low pressure output; In control loop, be provided with adjustable resistor R5, change the sampling voltage value of integrated circuit U1.
The utility model can change the conducting duty ratio of TOP by control loop and feedback loop, thereby reaches the purpose of stable output and pressure regulation.
* electromagnetic interface filter: form by C1, L1, C8;
* bridge rectifier filter circuit: form by BR1, C2;
* high-frequency switch circuit: the elementary winding by three end off-line type pulse-width modulation switching power supply integrated circuit U2, the clamped circuit VR1 of buffering, D1, T1 is formed;
* instead swash high frequency transformer: form by the anti-high frequency transformer T1 of swashing;
* feedback circuit: feedback winding, D4, C5, U3, C6, R1 by T1 form;
* output loop: output winding, D3, C3 by T1 form;
* control loop: output winding, control winding, D2, R2, R3, R4, R5, R6, C4, C7, U1, U3 by T1 form;
The utility model is performed such work: bridge rectifier filter circuit becomes DC power supply with civil power AC85-265V, high-frequency switch circuit makes the anti-elementary pulse current that passes through that swashs high frequency transformer with the frequency of 100KHz, make the anti-secondary acquisition switching voltage that swashs high frequency transformer, supply load by the output loop output dc voltage.Control loop obtains switching voltage by output winding, the control winding of T1, by D2, R2, R3, R4, R5, R6, C4, C7, U1, U3 the parameter of output dc voltage is offered feedback loop, by the pulse duration of feedback loop control high-frequency switch circuit, make load obtain galvanic current and press.By regulating the resistance value of R5, the pulse duration of change high-frequency switch circuit obtains load can continuous adjustable stable DC voltage.
Claims (1)
1. tap changer power supply, comprise bridge rectifier filter circuit, TOP integrated circuit, transformation filter circuit, feedback circuit, output loop, anti-sharp high frequency transformer, control loop, it is characterized in that: the output winding terminal of the transformer in the control loop (T1) is provided with tap, realizes low pressure output; In control loop, be provided with adjustable resistor (R5), change the sampling voltage value of integrated circuit (U1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01206556 CN2492004Y (en) | 2001-06-13 | 2001-06-13 | Voltage-regulating switching power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01206556 CN2492004Y (en) | 2001-06-13 | 2001-06-13 | Voltage-regulating switching power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2492004Y true CN2492004Y (en) | 2002-05-15 |
Family
ID=33627162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01206556 Expired - Fee Related CN2492004Y (en) | 2001-06-13 | 2001-06-13 | Voltage-regulating switching power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2492004Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401439A (en) * | 2013-07-10 | 2013-11-20 | 珠海许继芝电网自动化有限公司 | Wide-input voltage power supply of power distribution terminal |
| CN104653504A (en) * | 2015-03-12 | 2015-05-27 | 广东美的环境电器制造有限公司 | Control system of direct-current fan and direct-current fan |
-
2001
- 2001-06-13 CN CN 01206556 patent/CN2492004Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401439A (en) * | 2013-07-10 | 2013-11-20 | 珠海许继芝电网自动化有限公司 | Wide-input voltage power supply of power distribution terminal |
| CN103401439B (en) * | 2013-07-10 | 2015-07-08 | 珠海许继芝电网自动化有限公司 | Wide-input voltage power supply of power distribution terminal |
| CN104653504A (en) * | 2015-03-12 | 2015-05-27 | 广东美的环境电器制造有限公司 | Control system of direct-current fan and direct-current fan |
| CN104653504B (en) * | 2015-03-12 | 2017-01-18 | 广东美的环境电器制造有限公司 | Control system of direct-current fan and direct-current fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |