| 摘要 |
<p>[PROBLEMS] To provide sinusoidal waveform of voltage waveform minimizing the switching noise and constant voltage output without control, to enable direct response, and to respond to an instantaneous peak current without saturation of core. [MEANS FOR SOLVING PROBLEMS] An audio device is improved by a resonance type Royer converter base having less switching noise. A second inductor is inserted between a secondary side rectifier circuit and smoothing means. The second inductor is connected to the primary side inductor with the same magnetic circuit in the direction to cancel the DC magnetic flux. Moreover, the center tap voltage of the transformer is supplied to the synchronization signal input terminal of the control IC so as to decide the ON timing of the next cycle, thereby substantially stabling the self-oscillation operation. Thus, it is possible to satisfy the high requirement of the audio device.</p> |
