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Zhu; YaJiang
Shanghai, CN
No. of patents:

Patent Number Title Of Patent Date Issued
8587968 Control circuits and methods for switching mode power supplies November 19, 2013
A switching mode power supply (SMPS) includes a transformer having a primary winding, a secondary winding for providing an output voltage, and an auxiliary winding. The SMPS also includes a power switch coupled to the primary winding. A first control circuit is coupled to the secondary
8125799 Control circuits and methods for switching mode power supplies February 28, 2012
Circuits and method for sensing a system output voltage change and transmitting an electrical signal to an auxiliary winding on the primary side. In an embodiment, a primary side controller detects the electrical signal and turns a power switch on and off to transfer energy from a pr
8064231 Short circuit protection circuit for a pulse width modulation (PWM) unit November 22, 2011
A short circuit protection circuit for a pulse width modulation (PWM) unit which includes a PWM logic control circuit, an under voltage lookout (UVLO) circuit and an internal clock circuit; wherein the UVLO circuit detecting a bias power (Vcc) and delivering an UVLO signal when the bias
8045348 Switching mode power supply controller with high voltage startup circuits October 25, 2011
A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high voltage supply input terminal and configured to provide a charging current in a startup phase or protection mode of a swit

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