关键词: 直流风机, MOS 管控制, 温升, 模式切换

Abstract: The reliability of the MOS tube control circuit for direct current fans has always been a key concern for gas water heater controllers and manufacturers of gas water heaters. In response to the problem of high MOS tube temperature rise and reduced fan operating efficiency caused by poor adaptability of the current MOS tube control circuit of the direct current fan in gas water heaters, an adjustment circuit that could automatically adjust control parameters had been added to the original MOS tube control circuit of the direct current fan. Two MOS tube operating mode switching methods had been added to the fan control software to reduce MOS tube temperature rise and ensure the stability of fan operating efficiency. Based on the above scheme, a new DC fan MOS tube control software and hardware circuit was constructed, and experimental research and demonstration were conducted on the gas water heater controller. The experimental results show that the application of the regulating circuit and the new software control method can reduce the temperature rise of MOS tubes and improve the stability of fan operation efficiency, greatly improving the reliability and practicality of the MOS tube control circuit for the direct current fan of gas water heaters.

Key words: DC fan, MOS control, temperature rise, mode switching