Power supply control system and method

A power supply control system, comprising:

• a power supply unit providing a direct current input voltage;
• a timing sequence controller electrically connected to the power supply unit and powered by the power supply unit;
• at least one converting circuit electrically connected to the power supply unit and the timing sequence controller, the at least one converting circuit configured to convert the input voltage into a direct current working voltage;
• and
• a power managing controller, comprising:
• a detection unit electrically connected to an output port of the at least one converting circuit and configured to detect an voltage value of the output port;
• a comparison unit electrically connected to the detection unit and configured to compare the voltage value of the output port with a voltage value of the input voltage;
• and
• a control unit electrically connected to the comparison unit and the power supply unit and configured to control the power supply unit to switch on or switch off;
• wherein the control unit switches off the power supply unit when the voltage value of the output port is equal to the value of the input voltage during initialization of the time sequence controller.