Surge protection device and method for current sampling circuit

Surge protection device and method for current sampling circuit

  • CN 102,457,054 A
  • Filed: 10/22/2010
  • Published: 05/16/2012
  • Est. Priority Date: 10/22/2010
  • Status: Active Application
First Claim
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1. the anti-surge protective device of current sampling circuit comprises sampling unit, is connected between the sample port, is used for the load current sampling to circuit, produces sampled signal, supplies signal processing unit to use;

  • Signal processing unit, parallelly connected with said sampling unit, be used for said sampled signal and reference signal contrast, and the output contrast signal is to control unit;

    Control unit is used for exporting the load current that control signal is controlled said circuit according to the said contrast signal of said signal processing unit output;

    It is characterized in that;

    Said device also comprises;

    the first surge protective unit parallelly connected with said sampling unit, and/or, the second surge protective unit parallelly connected with said signal processing unit, wherein;

    The said first surge protective unit or the second surge protective unit end when its two ends pressure drop is lower than triggering and conducting voltage;

    Conducting when the pressure drop of sample port two ends is higher than said triggering and conducting voltage, the sampling unit that will be parallelly connected with it or the voltage clamp at signal processing unit two ends are in a clamp voltage.

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