System and method for suppression of peaking in an external LC filter of a buck regulator

摘要

Disclosed are systems and methods for suppressing voltage peaking in a buck regulator. In one aspect, a buck regulator comprises: a pulse-width modulator (PWM) that generates a pulsed signal; a switch operable to selectively connect the regulator to a DC power supply in response to the pulsed signal and output a pulsed output DC signal; a filter for filtering out high frequency noise from the pulsed output DC signal and generating a regulated output signal; an integrator for comparing the pulsed output DC signal with a reference voltage signal and generating an error signal for input to the PWM; a subtractor operable to subtract the reference voltage signal from the filtered output signal to generate an error feedback signal; and an adder operable to add the error feedback signal to the error signal for input to the pulse-width modulator in order to suppress voltage peaks in the filtered output signal.

主权项

1. A power regulator circuit comprising:
a pulse-width modulator operable to generate a pulse-width modulated signal; a switch operable to selectively connect the circuit to a DC power supply in response to the pulse-width modulated signal and output a pulsed output DC signal; a filter, having a resonance frequency, the filter coupled to the switch for filtering out high frequency noise from the pulsed output DC signal and generate a regulated output signal; an integrator operable to compare the pulsed output DC signal with a reference voltage signal and generate an error signal for input to the pulse-width modulator; a subtractor operable to subtract the reference voltage signal from the filtered output signal to generate an error feedback signal; and an adder operable to add the error feedback signal to the error signal for input to the pulse-width modulator in order to substantially suppress voltage peaks in the filtered output signal at the frequency near the resonance frequency of the filter.