Flash device with back-up capacitor voltage supply

Details Flash device with back-up capacitor voltage supply Flash device with back-up capacitor voltage supply

1983-10-26

1986-11-25

Moore, David K.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Condenser in shunt to the load device and the supply

315159, 354416, 3541451, H05B 4132

Patent

active

046251510

ABSTRACT:
The disclosed flash device is of the kind that incorporates an integrated processing circuit requiring a stable voltage, but one and the same battery supplies both a booster circuit and the processing circuit. The device avoids the drop in voltage to the processing circuit when the booster circuit draws current after a flash by means of a detector circuit that detects the flash or the operation of the booster circuit. A switching circuit responds to the output of the detector circuit and supplies the charge on a back-up capacitor to the integrated processing circuit. Thus, in the event of a flash, the processing circuit which is normally operated by power from the battery is protected from a supply voltage drop by the supply of a voltage from the back-up capacitor.

REFERENCES:
patent: 3787704 (1974-01-01), Dennewitz et al.
patent: 4301392 (1981-11-01), Hirata
patent: 4396870 (1983-08-01), Ikeda
patent: 4469990 (1984-09-01), Maruyama et al.

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