Air conditioning device, frequency conversion method and energy supply system

The invention provides an air conditioning device, a frequency conversion method and an energy supply system.The air conditioning device is characterized in that a PFC unit is connected with an alternating-current power source and a battery through switches and used for converting voltage provided by the alternating-current power source or the battery into first bus voltage to be provided for a first direct-current bus; the inverter unit converts the first bus voltage into driving voltage of an air conditioner compressor; the air conditioner compressor drives a compressor motor based on the driving voltage. The air conditioning device obtains electric energy from the alternating-current power supply or the battery, it is ensured that the air conditioner can still obtain electric energy through the battery to maintain normal work under the condition that the alternating-current power supply cannot work normally, and control over the working environment temperature is achieved; furthermore, in the energy supply