Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1999-08-06
2000-12-26
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 16, 363 97, 323266, H02M 3335, H02M 744, G05F 140
Patent
active
061669253
ABSTRACT:
A DC converter for stepping down DC voltage having two input terminals (E1, E2) to be connected to an input DC voltage source with a high voltage level; two output terminals (A1, A2) for taking a regulated low output DC voltage; a coil (TS) having a center tap (MA) and connected at one end (TA1) with a first one (E1) of the input terminals via an electronic switch device (MOS) and at the other end (TA2) with the second input terminal (E2) via a first capacitor (C1); the charging voltage of the first capacitor (C1) forming the output DC voltage; a second capacitor (C6) connected at one end with a node located between switching device (MOS) and coil (TS) and at the other end with the center tap (MA) via a first diode (D2); a control device (EV, PWM for comparing the charging voltage of the second capacitor (C6) with a reference voltage (REF) and rendering the switch device (MOS) conductive and non-conductive with a pulse-frequency modulated and/or pulse-width modulated switching pulse sequence depending on the result of comparison; and a second diode (D1) connected between the center tap (MA) and the second input terminal (E2); the two diodes (D1, D2) being poled to conduct current toward the second capacitor (C6) or away from the second input terminal (E2) with respect to the potential occurring on the center tap (MA) when the switch device (MOS) is nonconductive.
REFERENCES:
patent: 3851182 (1974-11-01), Wallace
patent: 4021717 (1977-05-01), Furuishi et al.
patent: 4030015 (1977-06-01), Herkok et al.
patent: 4533986 (1985-08-01), Jones
patent: 4796173 (1989-01-01), Steigerwald
patent: 4992919 (1991-02-01), Lee et al.
patent: 5426579 (1995-06-01), Paul et al.
patent: 5451962 (1995-09-01), Steigerwald
Richter Peter
Teissier Maxime
Galanthay Theodore E.
STMicroelectronics GmbH
Tarleton E. Russell
Vu Bao Q.
Wong Peter S.
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