Programmable PWM module for controlling a ballast
AssigneeKoninklijke Philips Electronics N.V.
InventorWang Sheoghong
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Abstract
A programmable Pulse Width Modulation (PWM) generator is disclosed wherein a single module provides four different signals utilized to control a ballast for a light device. By changing the value in a single register, various waveforms are achieved.
Claims10
Apparatus for generating a set of signals to control an electronic ballast, said apparatus comprising a control register for accepting plural states, each of which represents a mode in which said signals are generated, wherein said control register is connected to a set of logic gates, and wherein the state in said control register is utilized to configure the logic gates to implement one or more of (1) a delay between signals and (2) an overlap of signals in time.
A method for driving an electronic ballast comprising providing a module having a control register connected to a set of logic gates, generating a set of signals to control said electronic ballast through the steps of utilizing a state in said control register for configuring said logic gates to implement one or more of (1) a delay between signals and (2) an overlap of the signals in time.
Dependencies are inferred from the claim text.