Fire-fighting intelligent emergency light fixture for meeting multiple bus communication modes without using power supply chip

With the adoption of a single-chip computer PWM technology and a general switching power supply voltage-reducing circuit, a 24V direct current power supply is converted into a power supply required by a light fixture for working, and a MCU and LED lamp beads of the light fixture are powered. Software resources of a single-chip microcomputer are fully utilized, the conversion efficiency is high, the required semiconductor devices are few, and the light fixture is green and environment-friendly. An illuminating lamp is large in power, the single-chip computer PWM controls a 24V power supply to be converted to 12V power supply for supplying power to large-power LEDs of the illuminating lamp, and LED switching control and power supply conversion functions of the illuminating lamp are integrated into one body, so that a large-power switching power supply chip is saved. The periphery of the MCU of the light fixture is provided with a uniform bus communication module interface, so that a user can select different bu