Full-bridge converter with digital pulse modulation (DPWM) for driving a load

摘要

A method is described for driving a full-bridge circuit (34,64) comprising a circuit (31) generating a first output modulation signal (m1) and a second output modulation signal (m2) for controlling the full-bridge. The method comprises the steps for generating a first (X1) and a second (X2) square waveform having a common period (Ts), where the first waveform (X1) is configured in order to drive a leg of the full-bridge and the second waveform is configured in order to drive the other leg of the full-bridge. The method is characterized in that the first square waveform (X1) is generated with a first duty cycle based on a first modulation signal (m1); the second square waveform (X2) is generated with a second duty cycle greater than or equal to the first duty cycle of a time increment Ts/(N−1) based on the second modulation signal (m2).

主权项

1. Method for driving a full-bridge circuit comprising a circuit receiving an input modulation signal (m) and generating a first output modulation signal and a second output modulation signal for controlling the full-bridge, the method comprises the steps of:
generating a first and second square wave having a common square wave period, where the first square wave is configured to drive one leg of the full-bridge and the second square wave is configured to drive the second leg of the full-bridge,wherein:
the first square wave is generated with a first duty cycle based on the first modulation signal, where the first modulation signal is an N-levels truncate version of the input control signal; the second square wave is generated with a second duty cycle equal to or larger than the first duty cycle by an incremental time step Ts/(N−1) based on the second modulation signal, where the second modulation signal is obtained firstly by doing a difference between the input modulation signal and the N-levels truncated version, secondly by doing a rounding operation of said difference.