Control methods for over voltage protection and relevant power controllers

摘要

Disclosure includes a control method for over voltage protection, suitable for a power converter. The power converter has a rectifier for rectifying an alternative-current voltage into a direct-current input voltage. The direct-current input voltage is sensed and determined whether it locates in a valley. A detection voltage is provided, capable of representing the direct-current input voltage. The detection voltage is compared with a predetermined reference voltage. When the detection voltage exceeds the predetermined reference voltage and the direct-current input voltage is in the valley, an OVP signal is provided to stop the power conversion of the power converter.

主权项

1. A control method for over-voltage protection, suitable for a power converter with a rectifier for rectifying an alternative-current voltage to provide a direct-current input voltage, the control method comprising:
determining whether the direct-current input voltage is in a valley where a local minimum of the direct-current input voltage occurs; providing a detection voltage representing the direct-current input voltage; comparing the detection voltage with a predetermined reference voltage; and providing an OVP signal to stop a power conversion of the power converter when the detection voltage exceeds the predetermined reference voltage and the direct-current input voltage is in the valley.