Switched mode power supply and controlling method thereof

摘要

A switched mode power supply includes controller generating a control signal and supplying and disconnecting power for a certain time at a certain period in a standby mode according to the control signal, a timer generating a timing signal and inputting the timing signal into the controller, a backup unit repeatedly performing a charging and discharging operation for the certain time at the certain period in the standby mode and supplying power to the controller, and a signal feeding back unit transferring a control signal outputted from the controller and a signal having an information with respect to the power consumption of loads to the driving controller which controls the connection of a transformer for thereby minimizing the power consumption in the standby mode, and decreasing the power consumption of the power supply by supplying electric power for the certain time at the certain period in the standby mode. <IMAGE>