Study on Pulse Skip Modulation Mode in Smart Power Integrated Circuits and Its Test Technology

摘要

Up to now, the popular control modes for smart power integrated circuit (SPIC) are PWM and PFM. PWM bases on constant frequency variable width (CFVW) control pulse, whereas, PFM bases on constant width variable frequency (CWVF) control pulse. PWM converter has low efficiency with light loads and high amplitude harmonic. On the other hand, the control circuit and filter for PFM are much complex. This dissertation proposes a novel modulation mode named pulse skip modulation (PSM) for SPIC converter, which bases on constant width constant frequency (CWCF) control pulse. It is shown that PSM converter would improve its efficiency and suppress EMI. It also has quick response speed, good interfere rejection and strong robust. Furthermore, it is easy to realize PSM control circuit. The modulating theories of PSM are firstly studied in the world according to the author's investigation.