Patent ID: 6329766
Filing Date: 2001-12-11
Classification: H02M,H05B

Abstract:
A digital illumination adjusting circuit comprising:a microprocessor unit for controlling operation of the digital illumination adjusting circuit;a power phase detecting circuit connected to an alternating power source for detecting the phase of the alternating power source and outputting a phase synchronization signal to a phase synchronization input terminal of the microprocessor unit;a time base signal generating circuit for generating a time base pulse signal provided to the microprocessor unit as a time base signal of the microprocessor unit;a display for illustrating digital illumination adjusting operations and operation setting status of the digital illumination circuit;an input pad comprising a plurality of keys for a user to set operation modes and input data;wherein the microprocessor unit receives the phase synchronization signal from the power phase detecting circuit, utilizes half cycle of the alternating current power as a counting period, utilizes the time base signal generated from the time base signal generating circuit as counting pulses for the counting period, and generates a switch control signal based on an output power ratio set by the user for controlling a conductive angle of the switch circuit, which in turn controls the power outputted from the alternating power source to the load.