Drive circuit for driving a load with pulsed current

Details Drive circuit for driving a load with pulsed current Drive circuit for driving a load with pulsed current

2007-06-20

2011-11-22

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000

Reexamination Certificate

active

08063581

ABSTRACT:
A drive circuit (1) for driving a load (3) comprises: a power supply (10) for supplying an output current (IL); a controller (20) for controlling the power supply; a current sensor (25) for generating a current sense signal (V25); a controllable switch (30) in series with the output (2a, 2b), the switch being controlled by a mode controller (50); wherein the mode controller in a reduced brightness mode generates its switch control signal (SLC) for the switch for alternatively opening and closing the switch. At the end of a current pulse, an average current value averaged over the pulse duration is calculated, compared with a reference value (VREF), and, if said average value is larger than the reference value, a duration for the next pulse pause is calculated such that an average value averaged over the entire pulse period is equal to the reference value.

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