Time sequence control method and circuit

The invention discloses a time sequence control method and a circuit. The method comprises the steps that when a power supply monitoring module monitors that a first voltage of a first power supply signal received from a power supply input end is larger than a first voltage threshold value, an enabling control module is triggered to output a first enabling signal to a plurality of direct-current power supply modules; the plurality of direct-current power supply modules are used for converting the first power supply signal into a second power supply signal in response to the first enabling signal; the plurality of direct-current power supply modules output a second power supply signal; when the power monitoring module monitors that the first voltage is smaller than the first voltage threshold, the enabling control module is triggered to output a second enabling signal to the plurality of direct-current power supply modules and a self-locking circuit is triggered to output a locking signal until the second volt