Clamping protection circuit, resonance circuit and converter

Abstract

The embodiments of the present invention provide a clamp protection circuit, a resonant circuit, and a converter. The clamp protection circuit is configured to perform clamp protection for a circuit to be clamped, and includes: a first clamp diode, a second clamp diode, and a clamping device, where the first clamp diode is connected in series with the second clamp diode to form a bridge arm; the first clamp diode and the second clamp diode are connected with the circuit to be clamped; and the clamping device is connected in series between a midpoint of the bridge arm and the circuit to be clamped. The embodiments of the present invention further provide a resonator circuit and a converter both including the clamp protection circuit disclosed herein. In the technical solutions of the present invention, the clamp protection circuit uses only one clamping device to implement clamping for two resonant capacitors in a symmetric half bridge, thereby reducing the number of clamping devices required, and reducing the cost of the clamp protection circuit and the space occupied by the clamp protection circuit.

Description

Technical field [0001] The invention relates to circuit technology, in particular to a clamp protection circuit, a resonance circuit and a converter. Background technique [0002] Voltage clamp control is a very common technology in the field of switching power supplies, especially in the currently widely used LLC resonant topology. In order to protect the resonant capacitors and Metal Oxid Semiconductor (MOS) transistors in the LLC resonant topology from being damaged by stress, voltage clamping control must be adopted. [0003] At present, the more commonly used resonant converters that perform voltage clamp control through clamp protection circuits such as figure 1 Shown. figure 1 The circuit shown mainly includes: an input source 10, a clamping circuit composed of a diode 11, a clamping device 12, a diode 13, and a clamping device 14, a resonance capacitor 15, a resonance capacitor 16, a MOS tube 17, a MOS tube 18, a resonance A resonant circuit composed of an inductor 19 and ...

AI Technical Summary

Problems solved by technology

[0004] The above clamping circuit has the advantages of simplicity, reliability, and adjustable clamping voltage. However, due to the large number of clamping devices required, the implementation cost is high and the space occupied is relatively large.

Images