Patent ID: 6724989
Filing Date: 2004-04-20
Classification: H05B

Abstract:
A camera strobe recharging integrated circuit (IC) comprising:a one-shot unit defining a squaring circuit providing square wave signals; an R-S latch block unit having a set contact, a reset contact, and at least one output contact, said set contact being electrically connected with said one-shot unit, output level of said output contact being controlled to keep in output condition by signals generated by said set contact and said reset contact; a pulse width modulation (PWM) control unit including a reference voltage source, an oscillator, a PWM comparator, a voltage boost comparator, and a power source, said reference voltage source offering referential voltage, said PWM comparator having a first input contact electrically connected with said oscillator, a second input contact electrically connected with a reference voltage-divider unit, and a third input contact electrically connected with said R-S latch block unit via an inverter and a field effect transistor (FET), said power source being electrically connected with said third input contact of said PWM comparator, said voltage boost comparator with an output contact electrically connected with said reset contact of said R-S latch block unit; and a ready control unit including an FET, said FET having a source contact electrically connected with said output contact of said R-S latch block unit.