Abstract: With the advancement of technology and the improvement of manufacturing level, air conditioners have become a global product, and its mainstream trends include frequency conversion and energy saving. However, there are two urgent problems to be solved of the current inverter air conditioner. They are how to make the variable frequency drive control more generally adaptable to different power supply conditions, and improve the efficiency of the variable frequency drive. proposing an intelligent flexible boost control (IFBC) technology, which can effectively solve the following two problems: (1) the air conditioner can still work or not shut down when the voltage drops; (2) minimize energy loss and achieve the best drive control efficiency when the power generation constant K_e of inverter compressor is getting larger gradually. On the one hand, this IFBC technology can enable the air conditioner to start and run normally under the condition of low power supply voltage, ensuring the cooling and heating capacity. On the other hand, the boost control could be linked with the weak magnetic control which can be driven by a unified algorithm, to realize the optimization of this two control methods and achieve the best drive control efficiency with energy saving. The starting voltage can be as low as 120 V, the power consumption can be reduced by 8.6% at high frequencies above 65 Hz, and the average energy saving can reach 4%.

Key words: Frequency conversion drive, Intelligent flexible boost control, Low-voltage start, Low power consumption, High frequency