SEQUENCE CONTROL CIRCUIT FOR ENHANCING RELIABILITY IN CASE OF ABNORMAL POWERDOWN AND CONTROL METHOD THEREOF

The control circuit includes a signal indication circuit, a control/isolation circuit, and an energy storage circuit; the signal indication circuit is a logic AND gate circuit, has an input end connected to multiple paths of power-down monitoring signals and an output end connected to an input end of the control/isolation circuit, and when a level of any path of power-down monitoring signal is low, outputs a low level to the control/isolation circuit; an output end of the control/isolation circuit is connected to an enable end of a Direct Current (DC) power chip, and the control/isolation circuit controls and isolates an output signal of the signal indication circuit by means of two-stage Metal-Oxide-Semiconductor (MOS) tubes; and an output end of the energy storage circuit is connected to the control/isolation circuit to provide reserve power for operation of the MOS tubes of the control/isolation circuit.