Synthesis of PWM and quasi-resonant DC-to-DC power converters

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6343179

Maksimovic, D

Synthesis procedures for systematic construction of switched-mode DC-to-DC converter topologies in the two largest families-PWM (square-wave) and Quasi-Resonant (QR) - are developed in this thesis. The proposed synthesis procedure for PWM converter is based on a matrix representation of the converter topology and on general properties of PWM networks. The properties derived in the thesis include a constraint on the number of switches, a constraint on the number of reactances, and relations between the network complexity and attainable DC conversion ratios. The synthesis procedure starts with a set of desired specifications, which may include the DC conversion ratio, features of non-pulsating terminal currents and possible coupling of inductors, the number of reactances, the number of switches and, in particular, the number of active, transistor switches. Outputs of the procedure are all possible PWM converters that satisfy the required specifications. Quasi-Resonant converters - a family of DC-to-DC converters featuring zero-voltage or zero-current switching - are derived by adding two or more resonant elements to a two-switch PWM converter. Systematic synthesis of QR converters is based on extraction of all topologically distinct positions of resonant elements within a PWM converter. Addition of two resonant elements yields six classes of QR converters, two of which have not been identified before. Subject to different switch realizations and control timing, QR converters can exhibit vastly different behavior and properties. In particular, it is shown that a controllable rectifier can be used to achieve constant-frequency control in all QR converters. Unified DC analyses are completed for QR classes and operating modes of most practical interest.

• Research Organization: California Inst. of Tech., Pasadena, CA (USA)
• OSTI ID: 6343179
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240202* -- Power System Networks
Transmission & Distribution-- DC Systems-- (1990-)
CONSTRAINTS
DC TO DC CONVERTERS
DESIGN
ELECTRICAL EQUIPMENT
EQUIPMENT
FABRICATION
FREQUENCY RANGE
MATHEMATICAL MODELS
MATHEMATICS
OPERATION
SPECIFICATIONS
STRESSES
SWITCHES
SYNTHESIS
TOPOLOGY