Abstract: The invention provides a multi-phase digital pulse width modulator (MP-DPWM) to implement a distribution scheme which applies the duty cycle in the fastest possible manner with restriction on the number of switching actions per phase and cycle, and additionally takes the number of available phases into account. It modulates switching signals according to a duty cycle input command, their previous switching states, and the current switching cycle. The controller is adapted to additionally take the residue of the previous subcycle into account. In the control scheme: each phase is allowed switch up to twice per cycle; only the next phase in the cycle is additionally turned on, at the start of a subcycle, and if a phase is still on at the end of a subcycle it can be kept on for longer, if required.

Abstract: The invention provides a multi-phase digital pulse width modulator (MP-DPWM) to implement a distribution scheme which applies the duty cycle in the fastest possible manner with restriction on the number of switching actions per phase and cycle, and additionally takes the number of available phases into account. It modulates switching signals according to a duty cycle input command, their previous switching states, and the current switching cycle. The controller is adapted to additionally take the residue of the previous subcycle into account. In the control scheme: each phase is allowed switch up to twice per cycle; only the next phase in the cycle is additionally turned on, at the start of a subcycle, and if a phase is still on at the end of a subcycle it can be kept on for longer, if required.

Abstract: A digital SMPC (1) comprises an SMPS Transformer primary side (2) and an SMPS secondary side (3). Opto-couplers (4) perform bi-directional communication between primary side and secondary side communication circuits (5, 6). The primary side communication circuits (5) are connected via a loop controller (7) to the primary side (2). The secondary side communication circuits 6 are connected to the secondary side 3 via an ADC (8). The analogue-to-digital converter (ADC, 8) digitises the output voltage V0 on the secondary side. The secondary side communication module (6) encodes this value and uses the data couplers (4) to transmit it over the isolation barrier. The primary side communication module (5) receives and decodes the value and provides it to the loop controller module (7). The loop controller (7) is implemented as a Digital Signal Processor (DSP) or a hardware PID-controller.