Patent ID: 8138685
Filing Date: 2012-03-20
Classification: H02M,H05B,Y10S

Abstract:
1. A controller, receiving electric power required for operating through a driving voltage terminal and configured to control a converting circuit to convert an input voltage into an output voltage, the controller comprising: a start unit coupled to the driving voltage terminal and generating a starting signal after a driving voltage of the driving voltage terminal is higher than a first predetermined voltage; a control unit started to control the converting circuit after receiving the starting signal; and a latch unit coupled to the driving voltage terminal, started after receiving the starting signal, and generating a latch signal once the controller enters a protection mode, wherein a second predetermined voltage is a lowest operating voltage of the latch unit, and the second predetermined voltage is lower than the first predetermined voltage, and after receiving the latch signal, the control unit terminates at least a portion of operation thereof to reduce the electric power required for operating, so that the driving voltage is maintained to be higher than the second predetermined voltage.