Control circuit for switched mode power supply unit

Details Control circuit for switched mode power supply unit Control circuit for switched mode power supply unit

2006-09-05

2006-09-05

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021110, C363S041000, C363S049000

Reexamination Certificate

active

07102899

ABSTRACT:
The present invention relates to a control circuit for controlling the output power of a primary-controlled switched mode power supply unit, which comprises a primary switch and a transformer with an auxiliary winding. Within the auxiliary winding, voltage pulses are induced by primary-sided switching operations, which can be taken into account when controlling the output power. In order to provide an improved control and an enhanced flexibility with respect to the operational parameters, the sampling instance is determined based on the duration of the voltage pulse at the auxiliary winding during a previous switching cycle. In order to detect a defective contact between the auxiliary winding and the control circuit in a particularly simple and secure manner, the negative voltage pulse at the auxiliary winding occurring when the switch is closed may be used for confirming a proper connection. In order to optimize the switching off process of the switch and to reduce power losses, the output power may be controlled by comparing the current through the primary winding with two threshold values.

REFERENCES:
patent: 4510563 (1985-04-01), Sato
patent: 5438499 (1995-08-01), Bonte et al.
patent: 5459652 (1995-10-01), Faulk
patent: 5874841 (1999-02-01), Majid et al.
patent: 5956242 (1999-09-01), Majid et al.
patent: 1146630 (2001-10-01), None
patent: 1211794 (2002-06-01), None
patent: 04033566 (1992-02-01), None
patent: 08103075 (1996-04-01), None
PCT Notification of Transmittal of Copies of Translation of the International Preliminary Report on Patentability, mailed Mar. 2, 2006.

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