Infineon Technologies Austria Ag

Cha-Fu Tsai

Ronald B Hulfachor

Sujata Sen

Sue Perranoski

Tim Ng

Giuseppe Bernacchia

Mattia Oddicini

Kelsey Curtis

An isolated switched-mode power converter converts power from an input source into power for an output load. A digital controller senses a secondary-side voltage, such as a rectified voltage, of the power converter. The secondary-side voltage is divided down using a high-impedance voltage divider. The resultant divided-down voltage is provided to a voltage sensor within the digital controller. The voltage sensor level shifts the provided voltage, and buffers the resulting level-shifted voltage. The buffered, level-shifted voltage is provided to a tracking analog-to-digital converter (ADC) for digitization. The buffered signal provided to the tracking ADC has a high current capability, such that the voltage input to the tracking ADC may quickly converge before the tracking ADC outputs a digital value for the sensed secondary-side voltage.

Isolated switched-mode power converter having secondary-side rectified voltage sensing

A controller for a power converter includes: a first sense terminal and a second sense terminal for sensing an output voltage of the power converter; a bridging circuit configured to electrically couple the first sense terminal to the second sense terminal in a first state and electrically decouple the first sense terminal from the second sense terminal in a second state; and control circuitry configured to set the bridging circuit in the first state during a portion of a voltage ramp of the power converter, and to determine whether an open or short fault condition is present at either the first sense terminal or the second sense terminal based on a voltage across the bridging circuit in the first state.

Voltage feedback continuity failure detection in voltage regulators

Circuits and methods for secondary-side rectified voltage sensing in isolated switched-mode power converters

In one example, a method includes receiving a first differential signal including a first voltage signal and a second voltage signal, wherein the first differential signal includes a first common mode voltage; receiving a second common mode voltage. The method further includes determining, by a circuit, a second differential signal including a third voltage signal and a fourth voltage signal, wherein a difference between the third voltage signal and the fourth voltage signal is based on a difference between the first voltage signal and the second voltage signal, wherein the second differential signal includes the second common mode voltage. The method further includes outputting, substantially continuously, the second differential signal.

Circuit for common mode removal for DC-coupled front-end circuits

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Torrance, CA, United States of America

Cha-Fu Tsai