Alternating current (ac) dimming and emergency power supply method and device

An Alternating Current (AC) dimming and emergency power supply method, comprising the following steps that:

• (1) a Pulse Width Modulation (PWM) pulse module is arranged, an input end of the PWM pulse module being connected with AC of commercial power;
• (2) a relay is arranged at an output end of the PWM pulse module, and the relay is also connected with the commercial power;
• (3) a Light-Emitting Diode (LED) illumination module is arranged, an LED driving module being connected between the LED illumination module and the commercial power;
• (4) a storage battery module is arranged, the storage battery module comprising a power stabilization charging module and a storage battery;
• (5) a dual-operational amplification module and central processor module which are connected with each other are arranged, the storage battery being connected with the central processor module and supplying power to the central processor module for long;
• (6) an emergency illumination LED module connected with the central processor module is arranged;
• (7) when there is commercial power, the PWM pulse module controls the relay to switch off dimming AC output by the dual-operational amplification module and an AC signal sent by the central processor module, and at this moment, the AC of the commercial power supplies power to the LED illumination module through the LED driving module and simultaneously charges the storage battery through the voltage stabilization charging module;
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• (8) when there is no commercial power input, the central processor module outputs and transmits a positive power signal to the relay through the dual-operational amplification module, the relay connects the dimming AC output by the dual-operational amplification module with the AC signal sent by the central processor module, and transmits the positive power signal to the AC, thereby supplying power to a load connected to the AC to implement emergency power supply, and at the same time of emergency power supply, LED AC dimming is implemented through the dual-operational amplification module and the central processor module.