Abstract: With the popularity of range hoods and the promotion of modern cooking technology, more and more families begin to use range hoods. The requirements of families on the performance of range hoods are also improving. Due to the great differences in the environment in different regions, the performance of the whole product is also greatly affected. And in the process of development of the hood, there are some common quality problems, which can be avoided for the later product development through the exploration. By mainly discussing the influence of the phase margin of the loop in the frequency compensation parameters of the display board DC-DC circuit on the performance of the whole range hood in the low temperature environment, which provides a reference for the subsequent development of the range hood to be used in some areas with abnormal working conditions.

Key words: D-Box, DC-DC circuit, Frequency compensation parameters, Actual environment