Trigger circuit for flash lamp directly coupled to ac source

Details Trigger circuit for flash lamp directly coupled to ac source Trigger circuit for flash lamp directly coupled to ac source

H - Electricity

05

B

315/10, 315/63

H05B 41/16 (2006.01) H05B 41/30 (2006.01)

Patent

CA 1101487

D-9094-L TRIGGER CIRCUIT FOR FLASH LAMP DIRECTLY COUPLED TO AC SOURCE ABSTRACT A circuit arrangement for triggering an arc discharge flash lamp that is directly coupled through series circuitry across an alternating current (AC) source. The lamp is ignited by a high voltage pulse generated from a pulse transformer in response to discharge of a voltage doubler charging capacitor by a controlled switch trigger from an RC timing circuit at a predetermined phase of the alterna- ting current power source. Circuit operation is initiated by a switching arrangement which is coupled to the timing circuit through a zero crossing detector and shunt switch for assuring that the timing circuit starts at a predetermined point on the alternating current waveform. In this manner, the lamp reliably flashes with the same intensity each time a flash is requested.

297995

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