Cheng-Nan Wu

Title: Cheng-Nan Wu and Power Converter Control Innovations.

Introduction

Cheng-Nan Wu is an inventor based in Taipei, Taiwan, whose work focuses on control circuits for power converters. His listed portfolio includes 2 patents addressing current sensing and power-switch control.

Latest Patents

Wu’s listed patents describe techniques for improving the control and current measurement of power converters.

“Control circuit” concerns a converter with a transformer and power switch. Its current-emulating unit uses the transformer’s auxiliary-winding voltage transient and the switch’s turn-off time to determine a propagation delay period. It then selects sampling times during the switch’s conduction period and uses the corresponding voltages to estimate peak and valley currents. A control unit uses those estimates to generate a signal for the power switch.

“Control circuit with current sampling mechanism for reducing current error of output of power converter and control method thereof” describes a circuit that samples voltages from a sensing resistor to derive current-sensing values. An error amplifier compares a fixed reference voltage with a DC voltage generated from the converter’s output and produces an error signal. A comparator uses that signal and the real current-sensing voltage to generate a transition signal, which a control-signal generator uses to control the power switch.

Career Highlights

Wu’s listed work is associated with National Taiwan University. The patent descriptions highlight his focus on sampling-based current estimation and control methods intended to reduce current-sensing error in power converters.

Collaborations

Yaow-Ming Chen is identified as Wu’s coworker. The provided information does not specify the nature of their collaboration.

Conclusion

Cheng-Nan Wu’s listed inventions address practical challenges in power-converter control through current sampling, estimation, and power-switch regulation.