How to ensure EMC of frequency converters under high and low temperatures?

To ensure stable EMC performance of frequency converters under high and low temperature environments, attention must be paid to the temperature drift of component parameters and structural reliability. Temperature changes affect passive components: the capacitance of filter capacitors, the inductance of inductors, and the impedance characteristics of ferrite beads may change with temperature, causing the center frequency of the filter to shift and affecting the filtering effect. Therefore, components with stable temperature characteristics should be selected, such as capacitors made of X7R or C0G materials, and ferrite materials with wide temperature characteristics. The switching characteristics of semiconductor devices may also change with temperature. Structurally, temperature cycling may cause changes in mechanical stress, affecting the contact pressure of shielding gaskets and the tightness of screw connections, thereby reducing shielding effectiveness.

Shielding materials with stable elasticity over a wide temperature range should be selected. Low temperatures may make plastics brittle, affecting sealing. High temperatures may accelerate component aging and increase leakage current. Sufficient temperature margins should be provided for critical circuit parameters during design. Products need to undergo EMC testing under high and low temperature cycling to verify their performance within the specified operating temperature range. Many components from Yinte Electronics, such as CMZ common-mode inductors and PBZ ferrite beads, provide wide temperature range operation guarantees and are reliable choices for building environmentally resistant EMC designs.