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Zero-current zero-voltage soft-switching Buck converter

A zero-current, zero-voltage, soft-switching technology, which is applied in high-efficiency power electronic conversion, DC power input conversion to DC power output, and adjustment of electrical variables, can solve problems such as no explanation or report, complexity, and no data collected. , to achieve the effect of solving the reverse recovery problem and simple structure

Inactive Publication Date: 2019-04-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the strong demand for lightweight DC converters in many applications, in order to reduce the inductance volume of buck converters, the control frequency is getting higher and higher, resulting in switching losses that cannot be ignored
[0003] There are two traditional soft switching technologies: one is to realize the soft switching operation of the main switching tube by adding an auxiliary switch, but the auxiliary switch also has the problem of switching loss, and the conduction internal resistance of the auxiliary switch will also bring additional The other is to realize the soft switching operation of the main switching tube by adding a passive auxiliary network, but the existing auxiliary network is relatively complicated, and too many auxiliary diodes will cause diode loss
[0004] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

Method used

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  • Zero-current zero-voltage soft-switching Buck converter
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  • Zero-current zero-voltage soft-switching Buck converter

Examples

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Embodiment

[0024] This embodiment provides a zero-current zero-voltage soft-switching Buck converter, such as figure 1 shown. includes a main switch S 1 , a diode D 1 , a freewheeling inductor L and an output capacitor C; also includes two buffer capacitors C r1 and C r2 , a small inductor L r and a diode D 2 . Two snubber capacitors C r1 and C r2 respectively connected in parallel to the main switching tube S 1 and diode D 1 ;Small inductance L r Much smaller than the freewheeling inductance L, and coupled in the same direction as the freewheeling inductance L, and its coupling inductance M is greater than the small inductance L r The inductance value; small inductance L r One end of the coupled inductance composed of the freewheeling inductance L and the main switching tube S is respectively connected 1 and diode D 1 Between, the other end is connected with the output capacitor C, the diode D 2 The cathode is connected to the small inductor L r and freewheeling inductan...

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Abstract

The invention provides a zero-current zero-voltage soft-switching Buck converter. Two buffer capacitors Cr1 and Cr2, a small inductor Lr and an auxiliary fly-wheel diode D2 are introduced into a traditional buck converter. The two buffer capacitors are connected to a main switch tube S1 and a main fly-wheel diode D1 in parallel respectively, and the small inductor Lr is coupled to the main inductor, and the diode D2 is connected to the middle of the coupling inductor. The zero-current soft-switching on and the zero-voltage soft-switching off of the main switch tube S1 can be realized. Meanwhile, the zero-current off of the main fly-wheel diode D1 and the zero-current on and off of the auxiliary fly-wheel diode D2 can be realized. By virtue of the zero-current off of the diodes D1 and D2, the reverse recovery problem of the diodes is solved. According to the converter, the relatively high efficiency of the buck converter in the full load range can be realized, so that the converter is suitable for being applied to DC-DC voltage reduction of various load ranges.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a DC-DC converter and a soft-switching conduction technology, in particular to a zero-current zero-voltage soft-switching Buck converter. Background technique [0002] As a basic step-down DC-DC topology, the buck converter is widely used in industries such as automobiles, electric power, renewable energy, consumer electronics, and daily life. With the strong demand for lightweight DC converters in many applications, in order to reduce the inductance volume of buck converters, the control frequency is getting higher and higher, resulting in switching losses that cannot be ignored. [0003] There are two traditional soft switching technologies: one is to realize the soft switching operation of the main switching tube by adding an auxiliary switch, but the auxiliary switch also has the problem of switching loss, and the conduction internal resistance of the auxiliary switch ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582H02M1/0058Y02B70/10
Inventor 张勇殷承良
Owner SHANGHAI JIAO TONG UNIV
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