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Switching power supply

A switching power supply, AC power supply technology, applied in the direction of adjusting electrical variables, instruments, conversion equipment with intermediate conversion to AC, etc., can solve problems such as increasing power consumption, and achieve the effect of improving output voltage quality and saving power consumption.

Inactive Publication Date: 2009-05-06
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the switching power supply has the effect of preventing output voltage drift, the resistor 11 is always in the working state, and its real effective working time (clamping period) is only a period of time before the first output terminal 8 works normally, thus increases unnecessary power consumption

Method used

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Examples

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Embodiment Construction

[0011] Please refer to FIG. 2 , which is a schematic diagram of the switching power supply of the present invention. It includes an input rectification filter circuit 2, a pulse width control circuit 3, a transformer 4, a first output rectification filter circuit 5, a second output rectification filter circuit 6, a clamp circuit 7, a first output terminal 8 . A second output terminal 9 and a feedback circuit 10. The transformer 4 includes a first secondary coil L2 and a second secondary coil L3. Wherein the input rectification filter circuit 2, the pulse width control circuit 3, and the transformer 4 are sequentially connected in series. The output end of the first secondary coil L2 of the transformer 4 is connected to the first output end 8 through the first output rectification filter circuit 5, and the output end of the second secondary coil L3 of the transformer 4 is connected to the second output end through the second output rectification filter circuit 6. Terminal 9 is...

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PUM

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Abstract

The switching power supply includes an AC power source, an input rectifying / filtering circuit, a pulse width control circuit, a transformer, a first and a second output rectifying / filtering circuits, and a clamping circuit. Throught the pulse width control circuit, the input rectifying / filtering circuit is connected to primary side of the transformer. The first and the second output rectifying / filtering circuits are connected to first secondary coil and second secondary coil respectively. The clamping circuit is connected between the first and the second output rectifying / filtering circuits. Being composed of a voltage regulator tube, a triode and a resistance, the clamping circuit is in use for clamping the output voltage of the first output rectifying / filtering circuit at a stated value of voltage before normal load at output end of the said circuit so as to restrain drift of output voltage. The invention raises quality of output voltage and saves power consumption.

Description

【Technical field】 [0001] The invention relates to a switching power supply with two or more outputs, in particular to a switching power supply capable of solving output voltage drift. 【Background technique】 [0002] Today's switching power supply, because it does not have the disadvantages of traditional large and heavy low-frequency transformers, and because it has better energy efficiency under high-frequency operation, it is widely used in notebook computers and monitors. [0003] A switching power supply usually consists of an input rectifying and filtering circuit, a pulse width control circuit, a transformer, multiple output rectifying and filtering circuits, multiple output terminals and a feedback circuit. When the switching power supply provides voltage output to multiple sets of output terminals, and only some of the output terminals are loaded, or some of the output terminals are very lightly loaded and the rest of the output terminals are heavily loaded, the no-l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28G05F1/46
Inventor 谢冠宏何小光
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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