| 摘要 |
An oscillator, capable of delivering power from a d.c. power supply to a loa d at frequencies above 100 kHz comprises a pair of field effect transistors (1 6, 17) operating in anti phase in a resonant circuit and a voltage limiter (35) which in operation introduces a phase shift to the resonant circuit and returns energy to the power supply. The voltage limiter preferably comprises a diode clipper which is inductively coupled to the resonant circuit. A pulse time modulation drive system for an electrodeless backlight comprises such a n oscillator together with control means for starting and stopping the oscillator according to a pulse time modulation scheme.
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