A Transformer Class E Amplifier

Archives of Electrical Engineering

Miroslaw Mikolajewski¹ 

关键词: Class E amplifier;    resonant inverter;    dc/dc converter;    transformer;    leakage inductance;   

DOI  :  10.2478/aee-2014-0043

来源: Versita

【 摘 要 】

In a high-efficiency Class E ZVS resonant amplifier a matching and isolation transformer can replace some or even all inductive components of the amplifier thus simplifying the circuit and reducing its cost. In the paper a theoretical analysis, a design example and its experimental verification for a transformer Class E amplifier are presented. In the experimental amplifier with a transformer as the only inductive component in the circuit high efficiency ηMAX = 0.95 was achieved for supply voltage VI = 36 V, maximum output power POMAX = 100 W and the switching frequency f = 300 kHz. Measured parameters and waveforms showed a good agreement with theoretical predictions. Moreover, the relative bandwidth of the switching frequency was only 19% to obtain output power control from 4.8 W to POMAX with efficiency not less than 0.9 in the regulation range.

【 授权许可】

Unknown