Electronic ballast for a lamp

Details Electronic ballast for a lamp Electronic ballast for a lamp

2008-04-01

2008-04-01

Owens, Douglas W. (Department: 2821)

Electrical transmission or interconnection systems

Superimposed unlike currents

Ac and dc sources

C315S127000

Reexamination Certificate

active

07352079

ABSTRACT:
An electronic ballast for a lamp has a DC voltage connection; a switching unit having a supply voltage with the DC voltage connection being coupled thereto, and a first capacitor coupled between the supply voltage connection and a reference potential; an AC voltage connection, at which a voltage can be made available which has at least one AC component. The series circuit includes a first nonreactive resistor and a first diode, as a second nonreactive resistor coupled between the AC voltage connection and the supply voltage connection, a connection point between the first diode and the second nonreactive resistor, and a second capacitor coupled between the connection point and the reference potential. The first capacitor and the second nonreactive resistor are dimensioned such that the average voltage drop across the second nonreactive resistor is greater than or equal to the average voltage drop across the first capacitor.

REFERENCES:
patent: 4156150 (1979-05-01), Harrigan et al.
patent: 5798573 (1998-08-01), Saganovsky
patent: 6548989 (2003-04-01), Duff, Jr.
patent: 6633154 (2003-10-01), Duff, Jr.
patent: 6768271 (2004-07-01), Busse et al.
J. Wüstehube “Schaltnetzteile: Grundlagen, Entwurf, Schaltungsbeispiele” [Switched mode power supplies: fundamentals, design, circuit examples], Grafenau/Württemberg, Expert-Verlag, 1982, cf. figure 13.3.

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