| 摘要 |
A controller for a resonant inverter with a self-oscillating driver IC for powering AC loads, such as gas discharge lamps or regulated DC/DC converters, includes a timing circuit that generates control strobe pulses that are injected into the timing circuit. The timing circuit is coupled to an inverter resonant tank through a feed back circuit providing phase lock for the resonant inverter. The feed back circuit includes a passive phase shifting circuit for 360° closed loop phase shift. Phase controlled strobe pulses automatically adjust IC oscillator frequency for safe and stable inverter operation above resonant frequency. By injecting a small AC or DC control signal into the timing circuit, sync strobe pulse phase angle can be advanced or delayed and thus frequency and power of the phase lock system can be controlled. |
