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Reverse grounding protection circuit and ground fault circuit interrupter

  • US 10,177,555 B2
  • Filed: 10/06/2015
  • Issued: 01/08/2019
  • Est. Priority Date: 12/15/2014
  • Status: Active Grant
First Claim
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1. A reverse grounding protection circuit, comprising:

  • a power supply circuit;

    a leakage signal amplifying circuit;

    a leakage grounding detection circuit;

    a power supply indicator circuit;

    a manual detection circuit;

    a tripping mechanism control circuit;

    a reverse connection detection and execution circuit; and

    a power-on driving signal generating circuit,wherein;

    the leakage signal amplifying circuit carries out amplification of a leakage detection signal;

    the power supply indicator circuit carries out displaying of a power status;

    the manual detection circuit carries out a simulation of load leakage detection;

    the tripping mechanism control circuit carries out controlling of the reset switch;

    the reverse connection detection and execution circuit carries out reverse connection detection and on/off control when the reverse grounding protection circuit is in a reset state or a tripping state;

    the power-on driving signal generating circuit is configured such that, when power is turned on, the power-on driving signal generating circuit generates a driving signal for the reverse connection detection and execution circuit;

    the power supply circuit comprises a power supply filter circuit, a rectifier circuit, a first filter and regulator circuit, and a second filter and regulator circuit;

    the leakage grounding detection circuit comprises a leakage detection circuit and a grounding detection circuit, which detect leakage fault and grounding fault, respectively;

    the tripping mechanism control circuit comprises a reset switch provided on a live line and a neutral line of the reverse grounding protection circuit, which is located on the live line and the neutral line after the grounding detection circuit;

    the power supply filter circuit is connected to the live line at an input port;

    input terminals of the rectifier circuit are connected to the live line at the input port and an output terminal of the power supply filter circuit, respectively;

    a first output terminal pin of the rectifier circuit is grounded;

    a second output terminal pin of the rectifier circuit is connected to the first filter and regulator circuit and the second filter and regulator circuit;

    the first filter and regulator circuit of the power supply circuit is connected to the leakage signal amplifying circuit;

    the second filter and regulator circuit of the power supply circuit is connected to the power supply indicator circuit and supplies power to the reverse connection detection circuit and execution circuit;

    the leakage signal amplifying circuit is connected to the leakage grounding detection circuit and the tripping mechanism control circuit, respectively;

    the reset switch provided is located on the live line and the neutral line after the grounding detection circuit;

    the manual detection circuit is connected to the leakage grounding detection circuit;

    the second filter and regulator circuit of the power supply circuit is connected to the power-on driving signal generating circuit;

    the power-on driving signal generating circuit is connected to the reverse connection detection and execution circuit;

    the power supply filter circuit further comprises an inductor coil;

    the first filter and regulator circuit comprises a first current limiting resistor, a first filter capacitor, and an internal regulator circuit of a leakage signal processing IC at a first pin;

    the first current limiting resistor is connected between the second output terminal pin of the rectifier circuit and the first pin of the leakage signal processing IC;

    the first filter capacitor is connected between the first pin of the leakage signal processing IC and a ground;

    the second filter and regulator circuit comprises a second current limiting resistor, a stabilivolt, and a second filter capacitor;

    an input terminal of the second current limiting resistor is connected to the second output terminal pin of the rectifier circuit;

    an output terminal of the second current limiting resistor is connected to the power supply indicator circuit and the reverse connection detection and execution circuit;

    a positive terminal of the stabilivolt is grounded;

    a negative terminal of the stabilivolt is connected to an output terminal of the second current limiting resistor;

    a first terminal of the second filter capacitor is grounded, and a second terminal of the second filter capacitor is connected to an output terminal of the second current limiting resistor;

    the leakage detecting circuit of the leakage grounding detection circuit comprises a current first coupling induction coil and a third capacitor;

    the third capacitor is connected to two ends of the first current coupling induction coil to form a first filter circuit;

    the first filter circuit is connected to a first and a second pin of the leakage signal processing IC;

    the live and neutral lines pass through the first current coupling induction coil;

    the leakage grounding detection circuit comprises a second current coupling induction coil and a fourth capacitor;

    the fourth capacitor is connected to two ends of the second current coupling induction coil to form a second filter circuit;

    a first terminal of the second filter circuit is grounded and a second terminal of the second filter circuit is connected to a fourth pin of the leakage signal processing IC;

    the live and neutral lines pass through the second current coupling induction coil;

    the leakage signal amplifying circuit comprises the leakage signal processing IC, a first coupling capacitor, a negative feedback resistor, and a second coupling capacitor;

    the first coupling capacitor, the negative feedback coupling resistor, and the second capacitor are sequentially connected in series between the first current coupling induction coil and the second current coupling induction coil; and

    the negative feedback resistor in connected between a fifth pin and the fourth pin of the leakage signal processing IC.

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