Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-02-23
1995-08-15
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
H02M 3335
Patent
active
054425344
ABSTRACT:
A novel isolated, capacitive idling, Cuk switching-mode converter features two separate nonisolated feedback loops, one on the primary side to regulate against input voltage changes and the other on the secondary side to regulate against load current changes only. While preserving cost, size and simplicity of conventional multiple output switching-mode converters, the new converter and feedback control approach offers the advantages of simple feedback control implementation due to elimination of isolation requirements in the feedback control circuits, simultaneous regulation of all output voltages from no load to full load, and greatly improved bandwidth and step-load transient response. For operation from a rectified ac line, feedback control on the input to the transformer is modified to force the average input current to follow the full-wave rectified ac line voltage for unity power factor (UPF) performance on the input and wide bandwidth voltage regulation on the output. Both are demonstrated simultaneously in a single, isolated, multiple ac-to-dc switching-mode power converter. The novel decoupled feedback control is shown to be equally applicable to a number of Cuk-type converter topologies featuring capacitive energy transfer from a voltage source to a load.
REFERENCES:
patent: 4184197 (1980-01-01), Cuk et al.
A. Dauhajre and R. Middlebrook, "A Simple PWM-FM Control for an Independently Regulated Dual Output Converter," Proc. Tenth International Solid-State Power Electronics Conference (Powercon 10) Mar. 1983.
R. Mahadevan, et al., "A Converter with Three Switched-Networks Improves Regulation, Dynamics and Control," Proc. Tenth International Solid-State Power Electronics Conference (Powercon 10), pp. E1.1-E1.19, Mar. 1983.
H. Matsuo and F. Kurokawa, "Precise Regulation of Multiple Output Voltages in a DC-DC Converter," IEEE PESC Record, 1980, pp. 275-283.
Cuk Slobodan
Stevanovic Ljubisa
California Institute of Technology
Dougherty Thomas M.
Fernandez Antonio M.
To E.
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