Auxiliary power system

Main function

Convert the fluctuating DC grid voltage into constant voltage and constant frequency three-phase AC power to provide power for auxiliary electrical equipment. Electrical isolation between high-voltage and low-voltage electrical equipment is achieved through transformers. Provide DC power to the vehicle control electrical appliances and charge the battery at the same time.

System composition

It usually includes auxiliary inverter boxes, battery boxes, low-voltage boxes, etc. The auxiliary inverter box contains an auxiliary inverter and a charger, providing AC power and 110V DC power for the train. The battery box provides support for emergency power supply. The low-voltage box is equipped with components such as transformers and fuses.

Power supply load: including air conditioners, ventilators, air compressors, lighting equipment, control circuits, etc. In emergency situations, the battery can supply power to critical loads such as emergency lighting, ventilation, and door control.

Importance

It is a crucial guarantee for the normal operation of rail transit. The quality and reliability of its power supply directly affect passenger comfort, the safe operation of equipment, and operational efficiency. Once a malfunction occurs, it may lead to problems such as insufficient lighting and poor ventilation in the station, and in severe cases, it can cause safety accidents.

Development trend

It is moving towards intelligence, automation and energy conservation. Abroad, intelligent management and remote control have been achieved, and new energy technologies have been widely adopted. China is also making continuous progress, focusing on improving power supply quality and reliability.

Why Baoquan Zhijie

Baoquan Zhijie provides high-performance semiconductor devices including MOSFETs, IGBTs, SiC MOSFETs, and integrated power modules for auxiliary power systems.   Our solutions help manufacturers build intelligent, reliable, and energy-efficient rail transit power systems that enhance safety, comfort, and operational efficiency.