具有小耦合电容的高隔离电压多输出驱动电源研究

Study on high-isolation multi-output gate drive power supply with low coupling capacitance

新型高压电力电子开关器件要求驱动具有很高的隔离电压和极低的耦合电容,但已有研究对驱动电源耦合电容的定量分析不足。本文在LCL谐振变换器构成的驱动电源中采用单级磁环的电流互感器式变压器,建立了此类电源耦合电容的计算模型,得出了耦合电容的定量计算公式,并据此设计并实现了具有pF级耦合电容的高隔离多输出驱动电源。测量和实验结果表明,耦合电容计算模型是有效的,且该电源能有效抵御输出回路之间的故障干扰。

New high-voltage power electronic switch devices require high isolation voltage and ultra-low coupling capacitance of gate drive power supplies.However,quantitative analysis of coupling capacitance is insufficient in previous studies.In this paper,current transformers with single-stage magnetic rings are used in a gate drive power supply composed of LCL resonant converter.A calculation model of coupling capacitance of this kind of power supply is established,and the quantitative calculation formula of coupling capacitance is obtained.Based on this,a high-isolation multi-output gate drive power supply with PF-level coupling capacitance is designed and implemented.Measurement and experimental results verify that the proposed calculation model of coupling capacitance is effective,and the power supply can effectively resist the fault interference between the output circuits.