Method for designing resonance parameters of resonant converter for electrodeless lamp

Abstract

The invention relates to a method for designing resonance parameters of a resonant converter for an electrodeless lamp. The high-frequency LCCL resonant converter is composed of a half-bridge inverter circuit, a series-parallel resonant loop and a coupling coil, wherein the half-bridge inverter circuit is composed of a switch tube Q1 and a switch tube Q2, the series-parallel resonant loop is composed of a resonant inductor Lr, a resonant capacitor Cr, a blocking capacitor Cb and an excitation inductor Lc, and the coupling coil is composed of the excitation inductor Lc and an electrodeless lamp tube plasma discharging ring. After values of the Cb and the Lc are determined, the resonant parameters Lr and Cr are determined through a formula. In the formula, Leq and Req express an equivalent inductor and an equivalent resistor of the coupling ring auxiliary edge lamp tube plasma discharging ring mapped to the original edge, f expresses the work frequency of the resonant converter, and fo expresses the natural resonance frequency of the resonant loop. According to the method, it can be guaranteed that when the natural resonance frequency of the circuit is changed, ZVS soft switching of the electrodeless lamp can be still achieved, and the maximum power is output.

Description

technical field [0001] The invention relates to the technical field of resonant converter design, in particular to a method for designing resonance parameters of a resonant converter for an electrodeless lamp. Background technique [0002] Increasing the switching frequency can reduce the volume and weight of magnetic components such as inductors and transformers, and increase the power density of the converter. However, with the increase of the switching frequency, the resulting loss of the switching tube seriously affects the working efficiency of the circuit and the service life of the switching device. The high-frequency resonant converter can realize zero voltage switching (ZVS) or zero current switching (ZCS) of the switching tube by using its own resonance characteristics, and has the advantages of low switching loss, high efficiency, and low EMI Etc. Therefore, high-frequency resonant converters are widely used, and electronic ballasts for electrodeless lamps are t...

AI Technical Summary

Problems solved by technology

The parameter design of the resonant circuit of the traditional resonant converter is mostly based on the fundamental wave analysis method. The natural resonant frequency expressions used in the analysis and design are obtained by assuming that the converter works in an open circuit state, ignoring the load equivalent resistance The influence of the electrodeless lamp does not conform to the actual working conditions of the load of the electrodeless lamp, and it does not consider the working state of the electrodeless lamp when the inherent resonance point of the circuit is shifted due to the change of the resonant tank parameters

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