Texas Instruments Corporation

Chengdu Monolithic Power Systems Co., Ltd.

John Wiggenhorn

Rais Karimovich Miftakhutdinov

Lin Sheng

Jin Liang

Steven J Tumasz

Eric X Yang

Siran Wang

Qiming Zhao

Hong Huang

A controller of an isolated switching converter includes an error amplifying circuit, a modulation signal generator, a first comparison circuit, a primary off detection circuit, a secondary logic circuit, an isolation circuit and a primary logic circuit. The error amplifying circuit generates a compensation signal based on the difference between a reference signal and a feedback signal. The first comparison circuit compares the compensation signal with a modulation signal generated by the modulation signal generator and generates a first comparison signal. The primary off detection circuit detects whether the primary switch is off and generates a primary off detection signal. The secondary logic circuit generates a secondary control signal to control the secondary switch based on the first comparison signal and the primary off detection signal. The isolation circuit receives the first comparison signal and generates a synchronous signal electrically isolated from the first comparison signal. The primary logic circuit generates a primary control signal to control the primary switch based on the synchronous signal.

Isolated switching converter with secondary side modulation and control method

Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding.

Systems and methods for off-time control in a voltage converter

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Cary, NC, United States of America

John Wiggenhorn