Switch mode power supply controller with feedback signal...

Details Switch mode power supply controller with feedback signal... Switch mode power supply controller with feedback signal...

2011-05-17

2011-05-17

Sterrett, Jeffrey L (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S021160

Reexamination Certificate

active

07944722

ABSTRACT:
This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be sampled accurately on the primary side. The system identifies the knee point by fitting a tangent to a portion of a power transformer voltage waveform, and samples the voltage waveform at the knee point to determine the SMPS output voltage. In preferred embodiments this technique is implemented using a decaying peak detector, providing a timing signal indicating detection of the knee point. Sample/hold and error amplifier circuits may be employed to achieve output voltage regulation.

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