Static Characteristics of the Digital PWM and/or PFM Controlled Switching DC-DC Converters

Masahiro SASAKI  Hirofumi MATSUO  Fujio KUROKAWA  Yasuhiro MIMURA  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.3   pp.645-650
Publication Date: 2007/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.3.645
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Energy in Electronics Communications
switching power supply,  digital control,  dc-dc converter,  PWM control,  PFM control,  

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The digitally controlled dc-dc converter has the advantage of high reliability, high controllability and high flexibility. A new digital controller for the PWM and/or PFM controlled switching dc-dc converters is presented, which is versatile in general use such as the switching frequency from 20 kHz to 70 kHz, the hard-switching and soft-switching and so forth. As an example, we apply this controller to half-bridge type series resonant dc-dc converter with auxiliary switches, in which both PWM and PFM control modes are employed, and the output characteristics of the converter are discussed. As a result, the relationships among circuit parameters of the proposed digital controller, switching frequency of the dc-dc converter, oscillation frequency of the VCO as analog to digital signal converter are defined.