Bridgeless PFC converter working in Buck mode or Buck-Boost mode

A buck-boost and converter technology, applied in the direction of irreversible AC power input conversion to DC power output, no intermediate conversion to AC conversion equipment, sustainable manufacturing/processing, etc., can solve the limitation of power factor improvement, conversion Power density limitations of converters, converter heating and other issues

Inactive Publication Date: 2013-07-31
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the widely used PFC converter is the Boost converter, and the output voltage of the Boost converter is required to be about 400V. The power density of converters is limited; Sepic, Cuk and Buck-Boost converters are also often used in PFC applications. Although these converters can achieve high power factors, the switching stress is large, resulting in increased switching losses, reduced efficiency, and cost Increase; Buck converters are also increasingly used in PFC applications, but due to the dead zone problem, the improvement of power factor is limited

Method used

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  • Bridgeless PFC converter working in Buck mode or Buck-Boost mode
  • Bridgeless PFC converter working in Buck mode or Buck-Boost mode
  • Bridgeless PFC converter working in Buck mode or Buck-Boost mode

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Embodiment

[0024] Such as figure 1 As shown, a bridgeless PFC converter for step-down and step-up switching, including a first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the first diode D 1 , the second diode D 2 , the third diode D 3 , the fourth diode D 4 , the fifth diode D 5 , the sixth diode D 6 , inductance L and capacitance C;

[0025] The first switch tube S 1 The drains are connected to one end of the input voltage, the second diode D 2 The cathode connection of the first switching tube S 1 source of the first diode D 1 the anode connection;

[0026] The first diode D 1 cathode of the fourth diode D 4 The cathode of the third diode D 3 The anode of the sixth diode D 6 the anode connection of the sixth diode D 6 The cathode of C is connected to one end of the capacitor C and the positive pole of the output voltage;

[0027] The other end of the capacitor C is respectively connected to the negative pole of the output voltage and...

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Abstract

The invention discloses a bridgeless PFC (Power Factor Correction) converter working in a Buck mode or a Buck-Boost mode. The bridgeless PFC converter comprises a first switch tube, a second switch tube, a third switch tube, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, an inductor and a capacitor. When an absolute value of input voltage is greater than output voltage, the converter works in the Buck mode; and when the absolute value of the input voltage is less than the output voltage, the converter works in the Buck-Boost mode. Since the Buck-Boost working mode is added, the converter solves the problem that a Buck PFC converter has a dead zone inherently, and the power factor of the converter can be effectively increased.

Description

technical field [0001] The invention relates to the field of PFC converters, in particular to a bridgeless PFC converter with buck and buck-boost switching operations. Background technique [0002] At present, the widely used PFC converter is the Boost converter, and the output voltage of the Boost converter is required to be about 400V. The power density of converters is limited; Sepic, Cuk and Buck-Boost converters are also often used in PFC applications. Although these converters can achieve high power factors, the switching stress is large, resulting in increased switching losses, reduced efficiency, and cost Raise; Buck converter is also increasingly applied to PFC occasions, but because of its dead zone problem, the improvement of power factor is limited. Contents of the invention [0003] In order to overcome the shortcomings and deficiencies of the prior art, the present invention provides a bridgeless PFC converter that switches between step-down and step-up and ...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M3/10H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 张波张能黄子田肖文勋丘东元
Owner SOUTH CHINA UNIV OF TECH
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