Patent ID: 9118307
Filing Date: 2015-08-25
Classification: H02M,H03K

Abstract:
1. A method for generating PWM signals, comprising: generating an output voltage according to a pulse width modulation signal and an input voltage; generating an error signal by sampling the output voltage and differencing the sampled output voltage and an output voltage reference; determining a duty ratio that defines a duty cycle of a pulse width modulation signal by a PID controlling algorithm; generating the pulse width modulation signal by providing the duty ratio to a pulse width modulator; and continuously monitoring the duty ratio within one nominal PWM period by computing and comparing a plurality of consecutive duty ratios within said one nominal PWM period, said comparing comprising computing a duty ratio difference between the consecutive duty ratios, and in case the duty ratio difference exceeds a threshold during an off-time of the pulse width modulation signal, the pulse width modulator is triggered to start a new nominal pulse width modulation period earlier than a next scheduled PWM cycle.