基于有源钳位的高效单级开关功率放大器

发布时间：2018-08-13 08:19

【摘要】：在传统双极性移相调制(bipolar phase shift modulation,BPSM)半桥高频链逆变电路基础上,引入二极管钳位电容电路和有源钳位桥(active clamping bridge,ACB)电路实现辅助换流,提出了一种双极性移相调制半桥单级开关功率放大器(single-stage switching amplifier,SSA)电路,称之为BPSM ACB-SSA电路。在周波变换器换流期间,滤波电感电流通过续流二极管续流,钳位电容吸收滤波电感能量,并通过ACB电路送回电源端。通过钳位电路实现了周波变换器开关管的零电压开关(zero voltage switching,ZVS),并实现了变压器副边电压钳位。通过优化参数设计,可以实现原边逆变桥与ACB电路的ZVS。与传统两级D类功率放大器相比,BPSM ACB-SSA电路具有更高的效率和更小的体积。详细分析了BPSM ACB-SSA电路工作原理及换流特性,给出了软开关的条件,并设计了一台峰值功率120W的实验样机,验证了理论分析的正确性。
[Abstract]:Based on the traditional bipolar phase-shift modulation (bipolar phase shift) modulation-modulation (bipolar phase shift) half-bridge high-frequency chain inverter circuit, the diode clamping capacitance circuit and the active clamp bridge (active clamping bridge ACB circuit are introduced to realize auxiliary commutation. A bipolar phase-shifted modulation half-bridge single-stage switching power amplifier (single-stage switching amplifier) is proposed, which is called BPSM ACB-SSA circuit. During the commutation of the Zhou Bo converter, the filter inductor current is renewed through the diode, the clamped capacitance absorbs the filtered inductor energy, and the filter inductor is sent back to the power source through the ACB circuit. The zero voltage switch (zero voltage switch ZVS of Zhou Bo converter is realized by clamping circuit, and the voltage clamp of secondary side of transformer is realized. By optimizing the parameter design, the ZVS of the original side inverter bridge and ACB circuit can be realized. Compared with the traditional two-stage D-type power amplifier, the BPSM ACB-SSA circuit has higher efficiency and smaller volume. The operating principle and commutation characteristics of BPSM ACB-SSA circuit are analyzed in detail. The conditions of soft switching are given. An experimental prototype with peak power of 120W is designed to verify the correctness of the theoretical analysis.
【作者单位】：磁浮技术与磁浮列车教育部重点实验室(西南交通大学电气工程学院);广东锐顶电力技术有限公司;
【分类号】：TN722.75;TM46

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