Method for operating a switch in a free-running switch mode...

Details Method for operating a switch in a free-running switch mode... Method for operating a switch in a free-running switch mode...

2006-02-14

2006-02-14

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S097000, C363S021040

Reexamination Certificate

active

06999324

ABSTRACT:
A method for operating a switch, which is connected in series with a primary coil of a transformer in a free-running switch mode power supply, includes the provision of a modulation signal and the provision of a drive signal for the switch. The drive signal includes a recurrent pulse sequence which has at least one first switching-on pulse with a first pulse duration and at least one second switching-on pulse with a second pulse duration, and with the pulse duration of at least one of the switching-on pulses being modulated by the modulation signal within a range of valves which is predetermined by the control signal.

REFERENCES:
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patent: 6229716 (2001-05-01), Preller
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patent: 196 35 355 (1998-03-01), None
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F. Lin et al.: “Reduction of Power Supply EMI Emission by Switching Frequency Modulation”,IEEE Transactions on Power Electronics, vol. 9, No. 1, Jan. 1994, pp. 132-137.
Tetsuro Tanaka et al.:“Random-Switching Control In DC-To-DC Converters”,IEEE, 1989, pp. 500-507, Order No. CH2721-9/89/0000-0500, no date.

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