Abstract
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.
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