Car air-conditioner frequency conversion control system and its method

Abstract

The invention provides a vehicle air conditioner frequency conversion control system and a method thereof. A vehicle DC power supply is led directly; a stabilized voltage supply of the air conditioner is used to directly output a DC to a converter plant; each set of frequency transformators of the converter plant provides a threephase AC to a system unit of the air conditioner to drive each system unit of the conditioner to run in a mode of frequency conversion. The invention realizes the simplification of the conversion process of the vehicle air conditioner using the power supply, effectively reduces the energy consumption, raises the utilization efficiency of the power supply, greatly reduces the capacity of the power supply transfer device on the vehicle and reduces the volume of the air conditioner control circuit. The stabilized voltage supply of a voltage control module is directly led to the vehicle DC power supply; the DC power output terminal of the stabilized voltage supply is directly connected with the converter plant which is connected with an MCU by an asynchronous communication bus. The converter plant at least comprises two sets of frequency transformators; the power supply input terminals between frequency transformators are connected in parallel and are connected with the MCU by a common communication bus.

Description

technical field [0001] The invention relates to a frequency conversion control system and a method thereof, in particular to directly introducing a DC network voltage power supply to an air conditioner on a rail vehicle and using a frequency conversion compressor. Background technique [0002] At present, fixed-speed single-cooling air-conditioning systems are commonly used on various rail vehicles, and the power used is AC380V. The main power supply process is as follows figure 1 As shown, the first part is the vehicle power conversion device (auxiliary inverter), and its input is the network voltage DC750V, and there will be fluctuations of 250V up and down accordingly. The voltage is reduced by the chopper, and then the AC380V voltage is generated by the inverter device. [0003] The second part is the controller of the air conditioner. The existing vehicle air conditioner generally adopts an independent control cabinet, and the controller of the air conditioner is place...

AI Technical Summary

Problems solved by technology

[0004] For the existing vehicle air conditioner in the above scheme, the AC380V power used by the air conditioner unit is first rectified and then inverted through the network voltage DC 750V power supply, and then input through the frequency conversion conversion of the air conditioner controller, which not only causes large The energy loss and efficiency are low, and the corresponding circuit structure of the vehicle power conversion device (auxiliary inverter) and the air conditioner controller is complex and takes up a lot of configuration space, which is not conducive to the miniaturization and integrated design of the vehicle and air conditioner units

[0005] Moreover, the existing vehicle air conditioners rely on the input power with a certain frequency provided by the vehicle power supply, so most of them still use fixed-speed compressors, which is difficult to adapt to the climate environment in which various rail vehicles operate, and the temperature adjustment of vehicle air conditioners is endless. Reasonable, difficult to achieve precise temperature adjustment

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