Primary-side controlled programmable power converter

摘要

A circuit for controlling a programmable power converter is provided. The circuit comprises a control circuit, a switching controller, and a first opto-coupler. The control circuit generates a programmable voltage-reference signal for regulating an output voltage of the programmable power converter. A feedback circuit of the control circuit detects the output voltage for generating a feedback signal in response to the programmable voltage-reference signal and the output voltage. The switching controller detects a switching current of a transformer for generating a switching signal coupled to switch the transformer for generating the output voltage and an output current in response to the feedback signal and the switching current of the transformer. The first opto-coupler transfers the feedback signal from the control circuit to the switching controller. The control circuit is at the secondary side of the transformer and the switching controller is at the primary side of the transformer.

主权项

1. A circuit for controlling a programmable power converter, comprising:
a control circuit, generating a programmable over-voltage threshold for performing an over-voltage protection of an output voltage of said programmable power converter, generating a control signal by comparing said output voltage and said programmable over-voltage threshold, and detecting said output voltage for generating a feedback signal in response to a programmable voltage-reference signal and said output voltage, wherein said programmable over-voltage threshold will be reset to a minimum value whenever said programmable power converter is powered on; a switching controller, coupled to detect a switching current of a transformer for generating a switching signal coupled to switch said transformer for generating said output voltage and an output current in response to said feedback signal and said switching current of said transformer; and a first opto-coupler, coupled to transfer said feedback signal from said control circuit to said switching controller; wherein said control circuit is at the secondary side of said transformer, and said switching controller is at the primary side of said transformer; and wherein said control circuit has a communication interface for communicating with external devices.