Analysis for Noise Reduction Characteristices of Ceramic Varistor Using Circuit Simulator

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  • 等価回路モデルによるセラミックバリスタのノイズ吸収特性の解析
  • トウカ カイロ モデル ニヨル セラミック バリスタ ノ ノイズ キュウシュウ

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According to increase a use of DC motor for various electronic instruments together with a large-scale integrated (LSI) circuit, measures against a high frequency noise and a surge voltage have been very important to protect semiconductor device from miss operation and destruction. Ceramic varistor has a large electrostatic capacity and a large non-linear coefficient between applied voltage and current at the region of a large current. Therefore, it is often used to prevent these noise and surge. However, the large electrostatic capacity often causes a series resonance together with a inductance and a resistance of a motor. It is necessary to design a ceramic varistor suitably with considering characteristics of a motor.<br>In the present paper, the authors replaced a ceramic varistor with a simple equivalent circuit from the experimental results for frequency characteristics of capacity and dissipation factor and DC characteristics. After then analyse a noise reduction mechanism of ceramic varistor by using simulation program with integrated circuit emphasis (SPICE). In this method, it is easy to measure current which is conducted in a each part of ceramic varistor and motor. It is expected for the present method to design a ceramic varistor theoretically.

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