Power supply grounding fault protection circuit

A power supply grounding fault protection circuit, comprising:

• a power supply circuit;
• a leakage grounding detection circuit;
• a signal amplifying and shaping circuit;
• a microcontroller control circuit;
• a power supply detection and indicator circuit;
• a tripping mechanism control circuit;
• a reverse grounding detection and execution circuit;
• a wireless network circuit;
• and
• an automatic resetting circuit, wherein:
• the leakage grounding 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 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 microcontroller control circuit carries out power-on self-test and reset for the power supply grounding fault protection circuit;
• 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 tripping mechanism control circuit comprises a reset switch, which is provided on a live line and a neutral line of the ground fault protection circuit, and a control circuit that controls the reset switch;
• the reverse grounding 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 ground fault protection circuit in a reset state and in a tripped state;
• the wireless network circuit carries out sending and receiving of wireless signals of the power supply grounding fault protection circuit and is respectively connected to the power supply circuit and the microcontroller control circuit;
• the automatic resetting circuit is connected to the microcontroller control circuit and carries out controlling and driving of resetting actions of the reset switch of the tripping mechanism control circuit;
• 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 first filter and regulator circuit is connected to the leakage grounding detection circuit;
• the second filter and regulator circuit is connected to the signal amplifying and shaping circuit and the microcontroller control circuit;
• the leakage grounding 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, the tripping mechanism control circuit, and the reverse connection detection and execution 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 microcontroller control circuit comprises a microcontroller, a first capacitor, and a reset filter circuit;
• the reset filter circuit comprises a reset IC and a second capacitor;
• a first pin of the reset IC is connected to a VCC of the ground fault 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 power supply terminal of the microcontroller is connected to the VCC;
• a ground terminal of the microcontroller is grounded;
• the leakage detection signal amplifying circuit comprises a leakage signal processing IC, a third capacitor, a first resistor, and a fourth capacitor;
• the first resistor and the fourth capacitor are connected in series between the leakage detection circuit and the grounding detection circuit;
• the first resistor is connected between a first pin and a second pin of the leakage signal processing IC;
• the signal shaping circuit comprises an operation amplifier, a fifth capacitor, a sixth capacitor, a seventh capacitor, a second resistor, a third resistor, a fourth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, and a fifth resistor;
• the fifth, sixth and seventh capacitors are connected in parallel between the ground and a third pin of the leakage signal processing IC;
• the second resistor is connected between a fourth pin of the leakage signal processing IC and a first pin of the operation amplifier;
• the third and fourth resistors are connected in series between the VCC and the ground;
• a connection point of the third and fourth resistors is connected to a second pin of the operation amplifier;
• the eighth capacitor is connected between ground and the first pin of the operation amplifier;
• a power supply terminal and a ground terminal of the operation amplifier are respectively connected to the VCC and the ground;
• the ninth capacitor is connected between the power supply terminal of the operation amplifier and the ground;
• the fifth resistor and the tenth capacitor are disposed in series between the VCC and the ground;
• a connection point of the fifth resistor and the tenth capacitor is connected to a third pin of the operation amplifier;
• and
• the third pin of the operation amplifier is connected to a control signal input terminal of the microcontroller.