Synchronization circuit for a resonant flyback high voltage...

Details Synchronization circuit for a resonant flyback high voltage... Synchronization circuit for a resonant flyback high voltage...

H - Electricity

01

J

355/26

H01J 29/98 (2006.01) H02M 3/335 (2006.01)

Patent

CA 2005017

ABSTRACT OF THE DISCLOSURE A synchronization circuit for a resonant flyback high voltage supply for use in providing a high voltage output for a CRT. The circuit includes driving circuitry including an input power filter providing power to a coupled inductor which transmits power to a four stage multiplier circuit. Power is switched on and off by a power FET. The synchroni- zation circuit reduces power loss in the FET by using varia- tions in operational frequency to meet varying loads. By reducing the frequency as load increases, the flyback wave-- form is allowed to complete its resonant cycle before turning on the power FET. An anode resonant flyback regulator in- cluding a pulse width modulator controls the FET in response to signals provided by a negative slope detector circuit and feedback voltage. Over current shutdown capability is further provided by a current sensing latch.

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