Patent ID: 8106606

Claim:
A voltage multiple dimming control apparatus, comprising: a pulse width modulating signal input terminal, for inputting a pulse width modulating signal; a digital signal input terminal, for inputting a digital signal; a power signal to analog signal unit, for receiving the pulse width modulating signal and converting the same into a first analog signal and a second analog signal, where the second analog signal is smaller than the first analog signal in their references; a digital to analog unit, for receiving the digital signal and converting the same into a third analog signal and a fourth analog signal, where the fourth analog signal is smaller than the third analog signal in their references; a first multiplying unit, for multiplying the first analog signal with the third analog signal so as to generate a first product; a second multiplying unit, for multiplying the second analog signal with the fourth analog signal so as to generate a second product; a voltage slope generating unit, for receiving a frequency setup signal to generate a sloped voltage; and a judging unit, for generating an on-or-off signal or a reset signal based upon said sloped voltage, said first product, and said second product, where the on-or-off signal On/Off is used for turning on or turning off a dimming output, and said reset signal is for resetting the voltage slope generating unit.