Two-wire system delay control switch

A two-wire system delay control switch is composed of a power supply control module M0, a power management module M1, a delay control module M2 and a starting and resetting module M3, wherein the power supply control module M0 achieves dynamic power supply distribution of a load and a delay control circuit; the power management module M1 utilizes a capacitive energy storage principle for carrying out filtering, energy storage and DC-DC conversion on a rectified direct current, supplies power to a control circuit under the monitoring of a filtered voltage, improves electric energy conversion efficiency, and significantly reduces an operating current of the control circuit (can be as low as less than 1mA minimally); the delay control module M2 ensures accuracy and effectiveness of delay time through combined control of zero clearing, timing and resetting; and the starting and resetting module M3 utilizes a self-locking mechanism so that the delay control switch is completely disconnected from a controlled power supply in a non operating state, and achieves zero quiescent power consumption thus the two-wire system delay control switch is suitable for various kinds of loads such as resistive, capacitive and inductive loads. The two-wire system delay control switch substantially improves safety, reliability and applicability of the delay control switch on the premise of ensuring a two-wire system connecting method.