Locomotive Air Conditioning Power System Research And Design

Locomotive cab air condition systems can improve the micro-climate conditions of the driver's cab for locomotive drivers with a comfortable working environment. At the time of the rapid development of railway, it has very important practical significance for ensuring locomotive high-speed, safe operation. Therefore it is necessary to develop efficient and reliable locomotive air condition system. Compared with ordinary air condition running environment, the indoor environment of locomotive cab is bad, air condition heat load is large, operating conditions are poor and the voltage of power supply fluctuates intensely. These factors have higher requirements for the design, installation and commissioning of the air condition power supply. In order to improve the working environment of locomotive drivers, A stable power system is designed for locomotive air condition. Advanced control strategies are used to improve system stability for the special operating conditions.Firstly the working principle and application of locomotive air condition are described. The design program of locomotive air condition power system, including the main circuit and control circuit is proposed according to the specifications. The hardware structure of the power is designed using modules. Connectors are used to connect modules to facilitate assembly.DC-DC main transformation circuit and control circuit are designed. In order to boost the input voltage, boost topology is used in the main circuit. PWM pulse circuit and voltage negative feedback circuit are used in the control circuit. The results show that the designed DC-DC boost circuit has good performance, can maintain output voltage stability.DC-AC main transformation circuit and control circuit are designed. In order to make DC into AC to supply air condition unit, three-phase full-bridge inverter circuit is constituted by the IPM module in the main circuit. TMS320F2812 is used as a core control chip in the control circuit. SPWM technique is used. IPM drive circuit is designed.Finally, the software and hardware of main control circuit and fault protection circuit are designed, using the PIC microcontroller as the core. The working principle of fault protection is analyzed. The structure of protection circuit is described in detail. Anti-interference measures are designed to power system.