Patent ID: 8284570
Filing Date: 2012-10-09
Classification: H02M,Y02B

Abstract:
1. A modulation control system for a resonance circuit, wherein a controlling chip of the resonance circuit is connected to an associated controlling means that provides voltage matching and resistance control to the controlling chip, the controlling means providing controlling parameters to a modulating controlling chip in accordance with an input voltage, the controlling chip modulating the resonance circuit accordingly; wherein the controlling chip is a phase-shift pulse-width modulation controlling chip, a PWM generator and an oscillator communicating with a respective voltage matching module and a resistance controlling module of the controlling means, respectively; the voltage matching module and the resistance controlling module providing the controlling parameters to the phase-shift pulse-width modulation controlling chip in accordance with the input voltage, the phase-shift pulse-width modulation controlling chip modulating the resonance circuit accordingly; wherein both the voltage matching module and the resistance controlling module use a loop circuit voltage as the input voltage; the voltage matching module matches a phase-shift voltage interval corresponding to the loop circuit voltage with a voltage range in which the phase is shifted by the PWM generator of the phase-shift pulse-width modulation controlling chip; and the resistance controlling module is connected between the loop circuit voltage and the oscillator of the phase-shift pulse-width modulation controlling chip such that an equivalent resistance of the oscillator to the external is regulated accordingly as the loop circuit voltage changes.