Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-10-10
1997-05-06
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 363 97, H02M 3335
Patent
active
056277334
ABSTRACT:
A power supply device includes a series arrangement of an inductance (3), a switching device (4) clocked by a control circuit (12), and a current measuring impedance (5), which series arrangement is arranged between two terminals (1, 2) to which a supply voltage (Ue) can be applied. A voltage (Um) appearing across the current measuring impedance (5) is applied via an input resistor 17to an input (18) of the control circuit (12) to control the switching device (4), a capacitance (19) being in parallel with the input (18) of the control circuit (12).
A diode (20) is arranged in parallel with the input resistor (17), dimensioned in such a manner relative to one another that the diode (20) becomes conductive only when the Voltage (Um) across the current measuring impedance (5) exceeds a given limit value. Also, the ohmic resistance of the diode (20) together with the capacitance (19) forms a smaller time constant than the input resistor (17) with the capacitance (19). It is thereby achieved that despite a high attenuation for interference voltages short conduction times for the switching device (4) and, consequently, a small thermal load in the case of overloading are attainable.
REFERENCES:
patent: 4357654 (1982-11-01), Ikenoue et al.
patent: 4559592 (1985-12-01), Muller
patent: 4928220 (1990-05-01), White
patent: 5469349 (1995-11-01), Marinus
Eason Leroy
Han Y. J.
U.S. Philips Corporation
Wong Peter S.
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