Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1997-09-19
1999-03-30
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323282, 323284, 323266, 363 21, H02M 3156
Patent
active
058893903
ABSTRACT:
A circuit arrangement for converting a DC voltage into another DC voltage, with simultaneous regulation of the emittable voltage (U.sub.A) at a predetermined value. The circuit arrangement includes a combination of an upward and a downward transformer having at least one switching transistor (3) connected in series with a common memory coil (1) to a circuit output terminal, and a smoothing capacitor (5) connected in parallel to the output load (6), i.e., across the output terminals. The coil (1) is connected for a specific time to the supply voltage source (U.sub.Bat) by a time function circuit (9, 10). The coil (1) is connected directly to the positive pole (+) of the supply-voltage source (U.sub.Bat), and a current limiter circuit is provided in the long or forward branch of the circuit arrangement in front of the output of the circuit arrangement, with the current limiter circuit comprising a resistor (4) and a transistor (15) and influencing the switching transistor (3) disposed in the long branch. In addition to a first voltage limiting circuit formed of a series connection of a resistor and a Zener diode (16, 17), a further voltage limiter circuit (18, 19) is provided in parallel with the first voltage limiting circuit as short-circuit protection, with the further limiter likewise comprising the series connection of a resistor (18) and a Zener diode (19) which, however, has a different breakdown voltage than the first Zener diode (17).
REFERENCES:
patent: 4642550 (1987-02-01), Illuzzi et al.
patent: 4999566 (1991-03-01), Kuehn
patent: 5216351 (1993-06-01), Shimoda
patent: 5412555 (1995-05-01), Uramoto
"Aufwarts-/Abwarts-Schaltregler", Elektronik 26/26, 12, 1985. pp. 57-59. Engineering!, 9.sup.th edigion, Springer Verlag 1989, pp. 560-573.
Decker Gerhard
Preis Karl-Heinrich
Riehemann Thomas
Kunitz Norman N.
Patel Rajnikant B.
Robert & Bosch GmbH
Spencer George H.
Wong Peter S.
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