Jul. 09, 2021
Varistor is a voltage-limiting protection device. The main parameters of varistor are: varistor voltage, current capacity, junction capacitance, response time, etc. Varistors have multiple advantages. Read this article to find out!
The working principle of varistor:
When the voltage applied to the varistor is lower than its threshold, the current flowing through it is extremely small, which is equivalent to a resistor with infinite resistance. In other words, when the voltage applied to it is lower than its threshold, it is equivalent to an off-state switch. When the voltage applied to the varistor exceeds its threshold, the current flowing through it increases sharply, and it is equivalent to a resistor with infinitely small resistance. That is, when the voltage applied to it is higher than its threshold, it is equivalent to an on-state switch.
Advantages of varistor:
①The varistor has the advantages of being cheaper, small in size and easy to install.
②The varistor has a stable voltage under over-temperature conditions. In the case of a higher breakdown voltage, the control voltage of the varistor remains almost constant when it exceeds the operating temperature range. When the leakage current increases with the temperature of the component body, the control voltage of the varistor does not change.
③The varistor is made of millions of P-N structures. This structure has better volume absorption function and surge voltage withstand function.
④The varistor response is very fast. The varistor has similar behavior characteristics as other semiconductor components. Because the transmission of the varistor is fast, the delay is only within the limit of nanoseconds, so it can meet various practical requirements.
⑤The varistor has a high capacitance value. In the DC circuit, the capacitance of the varistor can not only play the role of decoupling, but also achieve multiple functions of suppressing transient overvoltage.
These are the advantages of varistors. No matter what kind of varistor is used, we must understand the application environment and the advantages of the varistors first, so that we will be more flexible when using it.
Dongguan Zhixu Electronic Co., Ltd. (also JYH HSU(JEC)) has a full range of capacitor and varistor models with guaranteed quality. JEC's safety capacitors have passed ISO9001:2015 quality management system certification; JEC safety capacitors (X capacitors and Y capacitors) and varistors have passed certifications of main industrial countries across the world; JEC ceramic capacitors and film capacitors are in line with environmental protection indicators.
JEC has more than 30 years of experience in the capacitor and varistor industry.We use our experience to create reliable products and offer superior services to our clients. If you have technical questions or need samples, welcome to contact us.
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