Capacitive distance sensor

Capacitive distance sensor

CN
  • CN 102,954,753 B
  • Filed: 10/22/2012
  • Issued: 09/09/2015
  • Est. Priority Date: 10/22/2012
  • Status: Active Grant
First Claim
Patent Images

1. a capacitive distance sensor, be made up of capacitance measurement pole plate, capacitive coupling pole plate, reference capacitance, reference capacitance charging circuit, capacitance measurement pole plate discharge circuit, charging neutrality circuit, programmable levels maker 1, programmable levels maker 2, voltage comparator, it is characterized in that:

  • Capacitance measurement pole plate, is 1 piece or polylith conductive plate, is connected with charging neutrality circuit, when tested electric conductor surface is close with capacitance measurement pole plate upper surface, is formed and measure electric capacity between capacitance measurement pole plate and tested electric conductor surface;

    Capacitive coupling pole plate, is 1 piece or polylith conductive plate, is connected with programmable levels maker 1, be positioned at below capacitance measurement pole plate, and have dielectric layer between capacitance measurement pole plate, between capacitive coupling pole plate and capacitance measurement pole plate, form coupling capacitance;

    Reference capacitance, be one or more shunt capacitances, one end is connected with reference capacitance charging circuit, charging neutrality circuit, voltage comparator input end 1, the other end be systematically connected;

    Reference capacitance charging circuit, one end is connected with reference capacitance, and the other end is connected with system power supply, and closure state makes reference capacitance and system power supply conducting, and off-state makes reference capacitance and system power supply disconnect;

    Capacitance measurement pole plate discharge circuit, one end is connected with capacitance measurement pole plate, the other end be systematically connected, closure state is by capacitance measurement pole plate and systematically conducting, and off-state makes capacitance measurement pole plate and systematically disconnects;

    Charging neutrality circuit, one end is connected with reference capacitance, and the other end is connected with capacitance measurement pole plate, and closure state makes reference capacitance and the conducting of capacitance measurement pole plate, and off-state makes reference capacitance and capacitance measurement pole plate disconnect;

    Programmable levels maker 1, is connected with capacitive coupling pole plate;

    Programmable levels maker 2, is connected with voltage comparator input end 2;

    Voltage comparator, input end 1 is connected with reference capacitance, and input end 2 is connected with programmable levels maker 2, and output terminal exports as sensor.

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