LED lighting technology has a long life, generally more than 50,000 h, and there is no mercury in the light source, the spectrum does not contain ultraviolet light; solid light, solid and reliable; low-voltage DC power supply, safe and reliable; significant energy saving. The article introduces an explosion-proof lighting and signal light applied to the traction motor vehicle of a downhole battery. The lighting consists of 3 3 W bright white LED lights; 3 3 W red LED lights form the signal light. Its drive circuit efficiency is up to 85%, the input voltage range is wide: DC 18~110V; AC 15~75 V, using DC converter to provide power, the converter on the direct converter controls the conversion of lighting and signal light, the headlight is illumination When the lamp is used, the rear lamp is a signal; when the previous lamp is a signal lamp, the backlight is illumination, long life, maintenance-free, and long-distance illumination, 60 lx (illuminance unit. It fully meets the requirements of explosion-proof lamps for coal mines.
1 circuit composition block diagram circuit block diagram as shown. The circuit adopts the transformer secondary coil feedback mode (SSR, which is characterized by two control loops, one is the current control loop, and the other is the voltage control loop. If the constant current constant voltage source is not used, then the LED volt-amperes Non-linear characteristics, small voltage changes will cause a large current change, and will soon burn out. When using constant current and constant voltage power supply mode, when the output load current is small, the voltage feedback loop works, with The voltage regulation characteristic, when the output current reaches or closes to the rated current, the current Ic is basically maintained through the current feedback loop. The system no longer uses the traditional way to protect the high and low voltage switches, but uses the Ethernet-based remote. Monitoring further realizes authorization, real-time control, data update and inspection and protection of fixed parameters for high and low voltage switches, etc. It is equipped with an IP phone that can guarantee real-time communication in the underground. When an accidental power supply accident occurs, the staff can keep the call and take countermeasures as soon as possible. Emergency transmission for important environments not only protects the personal safety of employees but also minimizes losses.
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