Patent ID: 6289180
Filing Date: 2001-09-11
Classification: G03B

Abstract:
A camera comprising:a battery;a photoflash circuit;a charging circuit to provide energy from said battery to said photoflash circuit;a switch coupled between said charging circuit and said battery to provide energy to said charging circuit;a current monitor coupled to said battery and said switch, to switch off said battery from said charging circuit when a current through said charging circuit exceeds a predetermined current value, wherein said battery remains available to provide energy to a microcontroller and other circuits of said camera monitor including a hysteresis margin to prevent oscillation from occurring in said current monitor;a strobe control section coupled to said current monitor, said strobe control section to transmit a control signal to said current monitor; anda voltage feedback section coupled to said charging circuit, said voltage feedback section including a hysteresis margin to maintain a voltage in said photoflash circuit.