Nov. 23, 2022
Safety capacitors are usually only used for filtering in anti-jamming circuits. They are used in the power supply filter to play the role of power supply filtering, and filter the common mode and differential mode interference respectively. When selecting safety capacitors, why should temperature be considered?
The loss tangent of the capacitor is the ratio of the electrical loss of the capacitor. In general, the tangent value increases with the increase of temperature. If a safety capacitor works at a temperature of 20-30 degrees Celsius, the tangent value is 0.0010, and when it works at a temperature of 100 degrees Celsius, the tangent value may be 0.0020. It can be seen the influence of temperature on the loss of the safety capacitor is great.
The capacitance of the safety capacitor changes with the temperature, which we call the temperature coefficient of the capacitor. It varies from +22% to -82%. When the temperature is too high, the compensation capacity of the capacitor will decrease, and it will resonate with a certain frequency harmonic in the power grid, causing damage to the system. Therefore, when designing a precision capacitor timing circuit and an oscillation circuit whose frequency is determined by the capacitor, the influence of temperature on the capacitance of the safety capacitor should be taken into account. Otherwise, the designed capacitor timing circuit will be inaccurate in timing and cause damage to the system.
Hopefully the content of this article can help you better understand safety capacitors. Select a reliable manufacturer when purchasing electronic components can avoid a lot of unnecessary trouble. JYH HSU(JEC) (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories are ISO 9000 and ISO 14000 certified. Welcome to contact us.
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