| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a high-efficiency amplifier for optimally controlling a phase difference between a voltage and a current without detecting a voltage waveform, and reducing a switching loss. <P>SOLUTION: It is necessary to possibly reduce the phase difference between an output voltage Vinv from a switch 12 and a current Iinv flowing between the switch 12 and a transformer 15 so as to reduce the switching loss. The amplifier is provided with a sinusoidal wave signal generating section 17 for outputting a sinusoidal AC signal at a variable frequency, a current detecting section 14 for detecting the current Iinv, and a frequency controlling means for controlling a frequency of the signal outputted from the sinusoidal wave signal generating section 17 so as to maintain a the predetermined phase difference of the current Iinv to the output signal from the sinusoidal wave signal generating section 17. <P>COPYRIGHT: (C)2007,JPO&INPIT |
