Modified Digital Pulse Width Modulator for Power Converters with a Reduced Modulation Delay

作者：Abu Qahouq Jaber^*; Arikatla VaraPrasad; Arunachalam Thanukamalam

来源：Journal of Power Electronics, 2012, 12(1): 98-103.

DOI：10.6113/JPE.2012.12.1.98

• Counter
• Delay
• Digital Control
• Digital Pulse Width Modulation
• Power Control
• Power Converter
• Transient Response

This paper presents a digital pulse width modulator (DPWM) with a reduced digital modulation delay (a transport delay of the modulator) during the transient response of power converters. During the transient response operation of a power converter, as a result of dynamic variations such as load step-up or step-down, the closed loop controller will continuously adjust the duty cycle in order to regulate the output voltage. The larger the modulation delays, the larger the undesired output voltage deviation from the reference point. The three conventional DPWM techniques exhibit significant leading-edge and/or trailing-edge modulation delays. The DPWM technique proposed in this paper, which results in modulation delay reductions, is discussed, experimentally tested and compared with conventional modulation techniques.

• 出版日期2012-1