Patent ID: 8817003
Filing Date: 2014-08-26
Classification: G09G,H02M

Abstract:
1. A power supply unit comprising: a power block comprising an input terminal for directly receiving an input voltage of the power supply unit, an output terminal for outputting an output power, and an enable terminal for receiving an enable voltage to control a driving of the power block, the input voltage being a set constant voltage, and the enable voltage being a division of the input voltage; an input power unit configured to concurrently transfer the input voltage to the input terminal and the division of the input voltage to the enable terminal, the enable voltage at the enable terminal being at a low state initially after receiving the input power, wherein the input power unit comprises: a controller configured to control the voltage of the input voltage transferred to the enable terminal to determine a driving time point of the power block, and configured to drive the power block to enable or suspend output of the output power by changing the voltage at the enable terminal between the low state and a high state, wherein the controller comprises a transistor having a first electrode coupled to the enable terminal of the power block, a second electrode coupled to a second resistor, and a gate for receiving a timing control signal, the second resistor being coupled between the second electrode of the transistor and the base power supply.