DC panel battery is widely used in power plants, substations DC system. To make the current system more safe and reliable operation line may be as shown uninterrupted power sup
ply switching circuit. Thyristor V, the regulator and the resistor R vs uninterruptible power conversion circuits and other components. When the AC 380V power supply is normal when, VS off, V off. When the AC 380V power supply is interrupted or when the motor Ul float voltage output fell due to a fault or eliminate lost time, vs breakdown, V conduction, the battery GB immediately to the control bus wc power.