Use of a rectified image voltage for controlling the switch on the primary side of a switched-mode power supply
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United States of America Patent
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Aug 19, 2003
Grant Date -
Feb 13, 2003
app pub date -
Jul 10, 2002
filing date -
Aug 7, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A switched-mode power supply has primary and secondary sides, and a transformer (M1) with a primary winding, a secondary winding and an auxiliary winding. The primary winding and the auxiliary winding are connected to the primary side, and the secondary winding is connected to the secondary side. A switch element (T3) is connected to the primary winding in order to interrupt a current flowing in the primary winding. The switched-mode power supply contains a freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) for generating switching pulses to the switch element (T3). A rectifying and charge storing coupling (D4, C5) is connected between the terminals of the auxiliary winding in order to generate such an image voltage which on the primary side represents a certain voltage of the secondary side. The switched-mode power supply further contains a coupling (D3, R9) from said rectifying and charge storing coupling (D4, C5) to said freely oscillating circuit (R5, C3, R7, T1, T2, R8, R9, R10, R11) in order to control how switching pulses are generated on the basis of the value of said image voltage.
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