The oxygen concentrator equipped with Qingzhengyuanhua's brushless DC motor variable frequency speed control system breaks through the technical bottlenecks of traditional oxygen concentrators, such as high noise, high energy consumption, and large starting impact. Through the leading new-generation variable frequency intelligent control technology, it achieves a leapfrog improvement in quiet performance and energy efficiency. This series of products takes "low noise, energy saving, durability, and high efficiency" as the core, upgrading the home oxygen therapy experience to a new era. Currently, most home oxygen concentrators adopt AC fixed-frequency technology, which has problems such as high noise during nighttime operation (about 40-50 decibels, equivalent to the noise of a daytime office or operating air conditioner) and high energy consumption, seriously affecting the user's continuous oxygen therapy experience. The technical breakthrough of the "DC variable frequency" oxygen concentrator lies in the integration of industrial-grade variable frequency technology into the field of home medical care. The AC motor of traditional oxygen concentrators can only operate at a fixed frequency and speed, while the brushless DC motor adopted by Qingzhengyuanhua, combined with a dynamic intelligent algorithm, realizes precise variable frequency adjustment of oxygen flow from 1 to 5 liters. By adjusting the motor speed and frequency in real time, it not only greatly improves the oxygen production accuracy and stability but also significantly reduces energy consumption and noise, bringing a revolutionary experience upgrade to the medical home oxygen concentrator scenario.