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Switch power supply and rectifying circuit

A technology of rectifier circuit and switching tube, which is applied to electrical components, AC power input to DC power output, output power conversion devices, etc., can solve the problems of low conversion efficiency and complicated control methods, and achieve the goal of reducing conversion efficiency The impact, the control method is simple, and the effect of preventing the bridge arm from passing through

Inactive Publication Date: 2015-05-13
SHENZHEN HONOR ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a switching power supply and a rectifier circuit with high conversion efficiency and simple control method in view of the above-mentioned defects of low conversion efficiency or complicated control method in the prior art

Method used

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Embodiment Construction

[0027] figure 2 It is a logic diagram of Embodiment 1 of the rectification circuit of the present invention. The rectification circuit includes: a first controllable switch tube Q1, a second controllable switch tube Q2, a third controllable switch tube Q3, a fourth controllable switch tube Q4, The first sampling comparison module 11 , the second sampling comparison module 12 , the first driving module 21 and the second driving module 22 . Wherein, the first controllable switch tube Q1, the second controllable switch tube Q2, the third controllable switch tube Q3, and the fourth controllable switch tube Q4 are all connected in antiparallel with diodes (not shown), or, the first controllable switch tube Q2 The switch tube Q1, the second controllable switch tube Q2, the third controllable switch tube Q3, and the fourth controllable switch tube Q4 all have equivalent diodes in the body, and the second end of the first controllable switch tube Q1 is connected to the second The fi...

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Abstract

The invention discloses a switch power supply and a rectifying circuit. The rectifying circuit comprises a first controllable switching tube, a second controllable switching tube, a third controllable switching tube, a fourth controllable switching tube, a first sampling comparison module, a second sampling comparison module, a first driving module and a second driving module. The four controllable switching tubes are respectively provided with an internal equivalent diode or an anti-parallel diode. The two sampling comparison modules are respectively used for conducting sampling on the positive half circle voltage and the negative half circle voltage and conducting comparison on the sampling voltage of the positive half circle of an alternating current power supply and the reference voltage value. The first driving module is used for controlling the switch-off of the second controllable switching tube and the third controllable switching tube when the sampling voltage of the positive half circle of the alternating current power supply is smaller than the reference voltage value. The second driving module is used for controlling the switch-off of the first controllable switching tube and the fourth controllable switching tube when the sampling voltage of the positive half circle of the alternating current power supply is smaller than the reference voltage value, and controlling the switch-on of the first controllable switching tube and the fourth controllable switching tube when the sampling voltage of the positive half circle of the alternating current power supply is larger than the reference voltage value. The switch power supply can improve the switching efficiency of the alternating current power supply and is simple in the control method.

Description

technical field [0001] The invention relates to the field of voltage conversion, in particular to a switching power supply and a rectifying circuit. Background technique [0002] With the development of science and technology, the power demand of electrical equipment is gradually increasing, the output power of a single switching power supply is also increasing rapidly, and the conversion efficiency requirements are getting higher and higher. [0003] Such as figure 1 As shown, the diode rectifier bridge, as a power component, realizes the conversion of the input AC voltage into the output DC voltage, and can be applied to various equipment with AC rectification. However, due to the large voltage drop of the PN junction of the diode rectifier bridge, it directly affects the conversion efficiency of the power supply. In order to improve the conversion efficiency of the power supply, the first thing people think of is to replace the PN junction diode bridge stack with a MOS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/219
Inventor 王合球
Owner SHENZHEN HONOR ELECTRONICS
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