Soft switching resonance BUCK converter adopting pulse width modulation control

A technology of soft switching and converter, which is applied in the field of switching power supply, and can solve problems such as complex circuit structure, excessive stress, and disappearance of soft switching conditions of soft switching BUCK converters

Active Publication Date: 2019-07-26
上海英联电子系统有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The circuit structure of the soft-switching BUCK converter using a combination of multiple passive components is complex, and due to the existence of the resonant circuit, when the converter is working in the process of transient changes such as on-off, over-current, and short-circuit, the soft-switching condition disappears and the stress Problems such as exceeding the standard have created difficulties for the optimal design of the circuit and actual product application
[0004] The soft-switching BUCK converter that us...

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  • Soft switching resonance BUCK converter adopting pulse width modulation control
  • Soft switching resonance BUCK converter adopting pulse width modulation control
  • Soft switching resonance BUCK converter adopting pulse width modulation control

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Embodiment Construction

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] Such as figure 1 As shown, the soft-switching resonant BUCK converter controlled by pulse width modulation includes input filter capacitor C1, BUCK main switch upper switch S1, BUCK main switch lower switch S2, BUCK inductor L1, auxiliary diode upper switch D1, and auxiliary diode lower switch D2 , resonant capacitor Cr, and output filter capacitor Co; in addition, figure 1 It also includes the input voltage source Vin and the output load Rload...

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Abstract

The invention relates to the field of switching power supplies, in particular to a soft switching resonance BUCK converter adopting pulse width modulation control. According to the converter, on the basis of a traditional BUCK converter, two diodes and one resonant capacitor are added, and a pulse width modulation mode is adopted, so that the soft switching of all switching devices can be realized. The converter is composed of an input filter capacitor, a BUCK converter upper tube, a BUCK converter lower tube, a BUCK converter inductor and an auxiliary diode upper tube, an auxiliary diode lower tube, a resonance capacitor and an output filter capacitor; by virtue of the converter, zero voltage switching of the BUCK converter upper and lower tubes can be realized; and meanwhile, the zero-current switching of the two auxiliary diodes can be realized. In addition, a control mode adopted by the converter is the pulse width modulation mode, so that the converter is easy to control, and a special controller is not needed.

Description

technical field [0001] The invention relates to the field of switching power supplies. The invention proposes a soft-switching resonant BUCK converter controlled by pulse width modulation. The converter adopts a pulse width modulation mode and can realize soft switching of all switching tubes. Background technique [0002] BUCK converter is the most basic and widely used power converter circuit in the field of switching power supply. In the discipline of power electronics technology, there are a large number of patented technologies and scientific documents that analyze and discuss the soft switching technology of BUCK circuits, and propose many solutions. There are two mainstream ways to realize the soft switching of BUCK converters. One uses a combination of multiple passive devices to provide soft switching conditions for the main switching device of BUCK by using auxiliary inductors and capacitors. The other uses auxiliary switching tubes and The combination of inducto...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0058Y02B70/10
Inventor 李斌张帅杨鑫李培永乔宗标
Owner 上海英联电子系统有限公司
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