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Switch power supply

A technology of switching power supply and power input, applied in the field of power supply, can solve problems such as high cost and complicated circuit, and achieve the effect of reducing cost

Inactive Publication Date: 2012-02-08
SHENZHEN TCL NEW-TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a switching power supply to solve the problems of complex circuits and high cost in the prior art

Method used

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Embodiment Construction

[0021] In order to make the purpose, features, and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below, together with the drawings attached to the description, for a detailed description. The description of the present invention provides different examples to illustrate the technical features of different implementations of the present invention. Wherein, the configuration of each element in the embodiment is for clearly illustrating the content disclosed in the present invention, and is not intended to limit the present invention. In addition, part of the reference numerals in the figures in different embodiments is repeated for the purpose of simplifying the description, and does not imply the correlation between different embodiments.

[0022] refer to figure 2 , figure 2 It is a circuit diagram of a preferred embodiment of the switching power supply of the present invention. The preferred embodiment of the switch...

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Abstract

The invention provides a switch power supply, which comprises a power supply input circuit, a rectifying and filtering circuit, a power factor correction circuit and a direct current transformation circuit, wherein a first induction coil is coupled between the output end of the filtering and rectifying circuit and the input end of the power factor correction circuit, the direct current transformation circuit comprises a second induction coil, the second induction coil is coupled with the first induction coil, the head end of the second induction coil is electrically connected with a negative electrode of a first capacitor and a positive electrode of the second capacitor, the tail end of the second induction coil is electrically connected with an anode of a first diode and a cathode of a second diode, a negative electrode of a second capacitor, an anode of the second diode and a negative electrode of a third capacitor are simulated to be grounded, and a positive electrode of the third capacitor is connected with the output end of the direct current transformation circuit. The switch power supply can realize all functions of the power factor correction (PFC) circuit and the direct current transformation circuit, and in addition, the cost is effectively reduced.

Description

technical field [0001] The invention relates to power supply technology, in particular to a switching power supply. Background technique [0002] The power supply adopts traditional bridge rectification and capacitor filter circuit, which will cause serious waveform distortion of AC input current and inject a large number of high-order harmonics into the power grid. Therefore, the power factor of the grid side is not high, only about 0.6, and has a negative impact on the grid and Other electrical equipment causes serious harmonic pollution and interference. As early as the early 1980s, people had attracted attention to the hazards caused by the high-order harmonic currents generated by such devices. In 1982, the International Electrotechnical Commission formulated the IEC55-2 specification for limiting high-order harmonics (later revised The specification is IEC1000-3-2), which has prompted many power electronics technicians to start research on harmonic filtering and power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M3/24
CPCY02P80/10
Inventor 李锦乐秦建设
Owner SHENZHEN TCL NEW-TECH CO LTD