Sepic converter with transformerless line isolation

Details Sepic converter with transformerless line isolation Sepic converter with transformerless line isolation

1994-08-10

1996-12-10

Nguyen, Matthew V.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

G05F 1656

Patent

active

055834213

ABSTRACT:
In DC-DC switching converters of the single-ended primary inductance (SEPIC) type, using a high frequency transformer to isolate the load from the AC power line is difficult because its leakage inductance causes serious circuit problems. In the invention, an additional coupling capacitor provides the required DC isolation without affecting circuit performance. The total coupling capacitance may be chosen to limit the power line frequency leakage current to a safe value.

REFERENCES:
patent: 4654769 (1987-03-01), Middlebrook
patent: 4801859 (1989-01-01), Disner
patent: 4811185 (1989-03-01), Cook et al.
patent: 5270636 (1993-12-01), Lafferty
patent: 5396165 (1995-03-01), Hwang et al.
Integrating Research, Industry And Education In Energy And Communication Engineering, Libson, Apr. 11-13, 1989, No. 11, Apr. 1989 Barbosa AM, pp. 38-42, XP000078301, Vicuna De L G er al, "Discontinuous Condution Mode In the Sepic Converter", Figure 2.
NTIS Tech Notes, Oct. 1987, Springfield, VA, p. 953, "Transformerless dc-Isolated Converter".
IEEE IAS 12th Annual Meeting, 2-6 Oct. 1977, Los Angeles, CA, pp. 1110-1126, Cuk and Middlebrook, "Coupled-Inductor And Other Extensions Of A New Optimum Topology Switching DC-to-Converter", p. 1120, right column; figure 23.
L. H. Dixon: "High Power Factor Preregulator Using The SEPIC Converter," Unitrode Integrated Circuits, 1993.

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