Protection circuit and ground fault circuit interrupter
First Claim
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1. A protection circuit, comprising:
- a power supply circuit;
a ground fault detection circuit;
a signal amplifying and shaping circuit;
a microcontroller control circuit;
a power supply detection and indicator circuit;
a tripping mechanism control circuit; and
a reverse connection detection and execution circuit, wherein;
the microcontroller control comprises a microcontroller, a first capacitor, and a reset filter circuit;
the reset filter circuit comprises a reset IC, a second capacitor, and a nineteenth capacitor;
a first pin of the reset IC is connected to a VCC terminal of the protection circuit, a second pin of the reset IC is connected to a reset terminal of the microcontroller, and a third pin of the reset IC is grounded;
the second capacitor is connected between the second and third pins of the reset IC;
the first capacitor is connected between a power supply terminal of the microcontroller and a ground;
the nineteenth capacitor is connected between the first pin of the reset IC and the ground;
the power supply terminal of the microcontroller is connected to the VCC terminal;
a ground terminal of the microcontroller is grounded;
the microcontroller control circuit carries out power-on self-test and reset for the protection circuit;
the ground fault detection circuit comprises a leakage detection circuit and a grounding detection circuit, which detect leakage failure and grounding failure, respectively;
the signal amplifying and shaping circuit comprises a leakage detection and signal amplifying circuit and a signal shaping circuit, which are connected to each other and carry out amplifying and shaping on a leakage detection signal;
the power supply detection and indicator circuit comprises a power supply detection circuit and an indicator circuit, which are connected to each other and carry out detection and displaying of a power status;
the reverse connection detection and execution circuit comprises a reverse connection detection control circuit and a detection and execution circuit, which are connected to each other and carry out detecting of a reverse connection of the protection circuit in a reset state and in a tripping state;
the power supply circuit comprises a power supply filter circuit, a first rectifier circuit, a first filter and regulator circuit, and a second filter and regulator circuit;
the tripping mechanism control circuit comprises a reset switch, which is provided on a live line and a neutral line of the protection circuit, and a control circuit that controls the reset switch;
the first filter and regulator circuit is connected to the ground fault detection circuit;
the second filter and regulator circuit is connected to the signal amplifying and shaping circuit and the microcontroller control circuit;
the ground fault detection circuit, the signal amplifying and shaping circuit, and the microcontroller control circuit are connected in sequence;
the microcontroller control circuit is connected to the power supply detection and indicator circuit and the tripping mechanism control circuit;
the power supply filter circuit is connected to an input terminal of the live line;
a first input terminal and a second input terminal of the first rectifier circuit are respectively connected to an input terminal of the neutral line and an output terminal of the power supply filter circuit;
a first pin of the first rectifier circuit is grounded;
a second pin of the first rectifier circuit is connected to the both the first filter and regulator circuit and the second filter and regulator circuit;
the reset switch is positioned on the live line and the neutral line after the grounding detection circuit;
the power supply filter circuit comprises an inductor coil;
the first filter and regulator circuit comprises a first resistor, a third capacitor, and an internal regulator circuit of a first pin of a leakage signal processing IC;
the first resistor is connected between the second pin of the first rectifier circuit and the first pin of the leakage signal processing IC;
the third capacitor is connected between the first pin of the leakage signal processing IC and the ground;
the second filter and regulator circuit comprises a second resistor, a stabilivolt, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a power supply IC, an eighth capacitor, a ninth capacitor, a tenth capacitor, and an eleventh capacitor;
the second resistor is connected between the second pin of the first rectifier circuit and a first pin of the power supply IC;
a positive electrode of the stabilivolt is grounded;
a negative electrode of the stabilivolt connected to first pin of the power supply IC;
the fourth, fifth, sixth, and seventh capacitors are connected in parallel between the first pin of power supply IC and the ground;
the eighth, ninth, tenth, and eleventh capacitors are connected in parallel between a second pin of the power supply IC and the ground;
the second pin of the power supply IC is connected to the VCC terminal;
and a third pin of the power supply IC is grounded;
the leakage detection circuit comprises a first current coupling induction coil and a twelfth capacitor;
the twelfth capacitor is connected between a first terminal and a second terminal of the first current coupling induction coil;
the first and second terminals of the first current coupling induction coil are connected to the second and third pins of the leakage signal processing IC, respectively;
the live and neutral lines pass through the first current coupling induction coil;
the grounding detection circuit comprises a second current coupling induction coil and a thirteenth capacitor;
the thirteenth capacitor is connected to a first terminal and a second terminal of the second current coupling induction coil;
the first and second terminals of the second current coupling induction coil are grounded and connected to the leakage detection and signal amplifying circuit, respectively;
andthe live and neutral lines pass through the second current coupling induction coil.
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Abstract
The present invention relates to a protection circuit and a ground fault circuit interrupter. A protection circuit may include a power supply circuit, a ground fault detection circuit, a signal amplifying and shaping circuit, a microcontroller control circuit, a power supply detection and indicator circuit, a tripping mechanism control circuit, and a reverse grounding detection and execution circuit. The microcontroller control includes a microcontroller, a first capacitor, and a reset filter circuit. The reset filter circuit comprises a reset IC, a second capacitor, and another capacitor. A ground fault circuit interrupter may comprise an interrupter body with a protection circuit in the interrupter body. The practice of the present disclosure may address installation safety risks of conventional ground fault circuit interrupters and arc fault circuit interrupter and improve the safety of ground fault circuit interrupters.
57 Citations
20 Claims
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1. A protection circuit, comprising:
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a power supply circuit; a ground fault detection circuit; a signal amplifying and shaping circuit; a microcontroller control circuit; a power supply detection and indicator circuit; a tripping mechanism control circuit; and a reverse connection detection and execution circuit, wherein; the microcontroller control comprises a microcontroller, a first capacitor, and a reset filter circuit; the reset filter circuit comprises a reset IC, a second capacitor, and a nineteenth capacitor; a first pin of the reset IC is connected to a VCC terminal of the protection circuit, a second pin of the reset IC is connected to a reset terminal of the microcontroller, and a third pin of the reset IC is grounded; the second capacitor is connected between the second and third pins of the reset IC; the first capacitor is connected between a power supply terminal of the microcontroller and a ground; the nineteenth capacitor is connected between the first pin of the reset IC and the ground; the power supply terminal of the microcontroller is connected to the VCC terminal; a ground terminal of the microcontroller is grounded;
the microcontroller control circuit carries out power-on self-test and reset for the protection circuit;the ground fault detection circuit comprises a leakage detection circuit and a grounding detection circuit, which detect leakage failure and grounding failure, respectively; the signal amplifying and shaping circuit comprises a leakage detection and signal amplifying circuit and a signal shaping circuit, which are connected to each other and carry out amplifying and shaping on a leakage detection signal; the power supply detection and indicator circuit comprises a power supply detection circuit and an indicator circuit, which are connected to each other and carry out detection and displaying of a power status; the reverse connection detection and execution circuit comprises a reverse connection detection control circuit and a detection and execution circuit, which are connected to each other and carry out detecting of a reverse connection of the protection circuit in a reset state and in a tripping state; the power supply circuit comprises a power supply filter circuit, a first rectifier circuit, a first filter and regulator circuit, and a second filter and regulator circuit; the tripping mechanism control circuit comprises a reset switch, which is provided on a live line and a neutral line of the protection circuit, and a control circuit that controls the reset switch; the first filter and regulator circuit is connected to the ground fault detection circuit; the second filter and regulator circuit is connected to the signal amplifying and shaping circuit and the microcontroller control circuit; the ground fault detection circuit, the signal amplifying and shaping circuit, and the microcontroller control circuit are connected in sequence; the microcontroller control circuit is connected to the power supply detection and indicator circuit and the tripping mechanism control circuit; the power supply filter circuit is connected to an input terminal of the live line; a first input terminal and a second input terminal of the first rectifier circuit are respectively connected to an input terminal of the neutral line and an output terminal of the power supply filter circuit; a first pin of the first rectifier circuit is grounded; a second pin of the first rectifier circuit is connected to the both the first filter and regulator circuit and the second filter and regulator circuit; the reset switch is positioned on the live line and the neutral line after the grounding detection circuit; the power supply filter circuit comprises an inductor coil; the first filter and regulator circuit comprises a first resistor, a third capacitor, and an internal regulator circuit of a first pin of a leakage signal processing IC; the first resistor is connected between the second pin of the first rectifier circuit and the first pin of the leakage signal processing IC; the third capacitor is connected between the first pin of the leakage signal processing IC and the ground; the second filter and regulator circuit comprises a second resistor, a stabilivolt, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a power supply IC, an eighth capacitor, a ninth capacitor, a tenth capacitor, and an eleventh capacitor; the second resistor is connected between the second pin of the first rectifier circuit and a first pin of the power supply IC; a positive electrode of the stabilivolt is grounded; a negative electrode of the stabilivolt connected to first pin of the power supply IC; the fourth, fifth, sixth, and seventh capacitors are connected in parallel between the first pin of power supply IC and the ground; the eighth, ninth, tenth, and eleventh capacitors are connected in parallel between a second pin of the power supply IC and the ground; the second pin of the power supply IC is connected to the VCC terminal; and a third pin of the power supply IC is grounded; the leakage detection circuit comprises a first current coupling induction coil and a twelfth capacitor; the twelfth capacitor is connected between a first terminal and a second terminal of the first current coupling induction coil; the first and second terminals of the first current coupling induction coil are connected to the second and third pins of the leakage signal processing IC, respectively; the live and neutral lines pass through the first current coupling induction coil; the grounding detection circuit comprises a second current coupling induction coil and a thirteenth capacitor; the thirteenth capacitor is connected to a first terminal and a second terminal of the second current coupling induction coil; the first and second terminals of the second current coupling induction coil are grounded and connected to the leakage detection and signal amplifying circuit, respectively; and the live and neutral lines pass through the second current coupling induction coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeZe Chen
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Original AssigneeZe Chen
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InventorsPan, Xincheng, Wu, Tingting, Zhang, Ye
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Primary Examiner(s)Leja, Ronald W
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Assistant Examiner(s)Clark, Christopher J
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Application NumberUS15/004,566Publication NumberTime in Patent Office1,159 DaysField of SearchUS Class CurrentCPC Class CodesH02H 3/334 with means to produce an ar...H02H 3/335 the main function being sel...H02H 3/338 also responsive to wiring e...
