Ground wire live detection control device and control method thereof

Abstract

According to the ground wire electrification detection control device and the control method thereof, by controlling the output voltage of the rectifying circuit, heating of the voltage stabilizing circuit can be reduced, the voltage stabilizing circuit can be protected, and meanwhile power consumption and energy waste are reduced under the condition that the ground wire electrification is not detected; and a signal attenuation circuit is adopted at the input end of the input circuit and is combined with the input circuit, so that the circuit is more stable, induced voltage can be removed, misoperation can be effectively reduced, the stability of a product is improved, and user requirements are further met.

Description

Technical Field

[0001] This invention belongs to the field of ground wire live detection technology, specifically relating to a ground wire live control device and its control method. Background Technology

[0002] Existing technologies, such as the household appliance mentioned in document CN112833616A, are prone to malfunction due to the induced voltage from the live wire at the ground terminal; the leakage current protection device mentioned in document CN101257202A and the ground wire live detection protection circuit mentioned in document CN112290519B have complex circuits, high costs, and are easily damaged during withstand voltage testing; the leakage current protection control device mentioned in document CN219843422U has poor stability and therefore has not been widely used. Live detectors, which use RC step-down power supply devices, typically use rectified voltage regulated by a voltage regulator circuit before supplying power to the load circuit. When the control circuit is not working, the voltage regulator circuit experiences a large load under no-load conditions, especially when using two-terminal Zener diodes for voltage regulation. This not only easily leads to overheating and prolonged standby operation but also results in significant energy waste. In addition to meeting the national standard high withstand voltage test, which is usually AC voltage test of 1500V and above, existing live detectors also need to ensure good stability when there is no ground wire, so as to avoid the live detector from malfunctioning due to weak induced voltage. Summary of the Invention

[0003] This invention provides a ground wire energized control device and control method that can better solve the above problems.

[0004] A ground wire live detection and control device and its control method include a live detection circuit, a resistor-capacitor step-down circuit, a rectifier circuit A, a voltage regulator circuit, an energy-saving protection circuit, and a control circuit A. The input terminal of the rectifier circuit A is electrically connected to the resistor-capacitor step-down circuit and the neutral wire port, respectively, and the output terminal of the rectifier circuit A is electrically connected to the voltage regulator circuit. If the live detection circuit does not detect a ground wire live signal, the energy-saving protection circuit controls the positive terminal of the rectifier circuit A to be short-circuited to the negative terminal, or connected to a low-resistance resistor. If the live detection circuit detects a ground wire live signal, the energy-saving protection circuit controls the output terminal of the rectifier circuit A to be disconnected, or connected to a high-resistance resistor. The control circuit A operates, outputting a control voltage to provide operating voltage for the load.

[0005] The energy-saving protection circuit is controlled by a low-resistance resistor, and the rectifier circuit output is equipped with a power indicator light; the low resistance is set between 10-100Ω.

[0006] A signal attenuation circuit is provided between the input terminal of the live detection circuit and the neutral wire port.

[0007] The signal attenuation circuit is set as capacitor A, whose capacitance is equal to or greater than that of capacitor B in the input circuit.

[0008] The signal attenuation circuit is set as resistor A, whose resistance is equal to or less than the input circuit resistance B.

[0009] The signal attenuation circuit is set to any combination of resistors and capacitors; thereby achieving accurate voltage control, avoiding circuit operation caused by weak induced signals, and improving its operational stability.

[0010] A ground wire energized control device includes a neutral wire port, a ground wire port, an input circuit, a signal attenuation circuit, a rectifier circuit B, and a control circuit B. The neutral wire port is electrically connected to one end of the input terminal of the rectifier circuit B. The ground wire port is electrically connected to the other end of the input terminal of the rectifier circuit B via the input circuit. The input circuit is equipped with a signal attenuation circuit. The control circuit B is connected in series between the positive and negative terminals of the output terminal of the rectifier circuit B.

[0011] The input circuit is configured as capacitor B, and the signal attenuation circuit is configured as capacitor A, with capacitor A having a larger capacitance than capacitor B. The circuit includes a resistor-capacitor (RC) step-down circuit, a rectifier circuit A, a voltage regulator circuit, an energy-saving protection circuit, and a control circuit A. The input terminal of the rectifier circuit A is electrically connected to the RC step-down circuit, and the output terminal of the rectifier circuit A is connected to the voltage regulator circuit. If no live signal is detected by the live detection circuit, the energy-saving protection circuit activates, short-circuiting the positive and negative terminals of the rectifier circuit A output terminal. If a live signal is detected, the energy-saving protection circuit disconnects the short-circuit connection at the output terminal of the rectifier circuit A. The control circuit A activates, outputting a control voltage to provide operating voltage to the load. Control steps: Step 1: Turn on the power. When the detection circuit does not detect that the ground wire is live, the energy-saving protection circuit will short-circuit the output terminal of rectifier circuit A, so that the output voltage of rectifier circuit A is lower than the voltage regulation value of the voltage regulator circuit; the voltage regulator circuit will not work.

[0012] Step 2: When the detection circuit detects that the ground wire is live, the energy-saving protection circuit controls the output terminal of rectifier circuit A to be disconnected or set to a high resistance value, so that the output voltage of rectifier circuit A is higher than the voltage regulation value of the voltage regulator circuit, and the voltage regulator circuit works; control circuit A works, and outputs control voltage to supply the load.

[0013] A control method 2 for a ground wire live detection and control device includes a live detection circuit, a resistor-capacitor step-down circuit, a rectifier circuit A, a voltage regulator circuit, an energy-saving protection circuit, and a control circuit A. The input terminal of the rectifier circuit A is electrically connected to the resistor-capacitor step-down circuit, and the output terminal of the rectifier circuit A is connected to the voltage regulator circuit. If the live detection circuit does not detect a live signal, the energy-saving protection circuit operates, connecting the positive terminal of the rectifier circuit A's output terminal to a low-resistance resistor. If the live detection circuit detects a live signal, the energy-saving protection circuit controls the output terminal of the rectifier circuit A to be either disconnected or connected to a high-resistance resistor, ensuring that the output voltage of the rectifier circuit A is higher than the regulated voltage. The control circuit A operates, outputting a control voltage to provide operating voltage to the load. Control steps: Step 1: When the power is turned on, if the detection circuit does not detect that the ground wire is live, the energy-saving protection circuit will connect the output terminal of the rectifier circuit A to a low-resistance resistor, so that the output voltage of the rectifier circuit A is lower than the voltage regulation value of the voltage regulator circuit; the voltage regulator circuit will not work; the control circuit A will output a control voltage to control the load to not work. Step 2: When the detection circuit detects that the ground wire is live, the energy-saving protection circuit controls the output terminal of the rectifier circuit to disconnect or set a high resistance value, so that the output voltage of rectifier circuit A is higher than the voltage regulation value of the voltage regulator circuit, and the voltage regulator circuit works; control circuit A outputs control voltage to control the load to work.

[0014] As can be seen from the above technical solutions, the ground wire live detection and control device and its control method of the present invention can not only reduce the heat generation of the voltage regulator circuit and protect the voltage regulator circuit by controlling the output voltage of the rectifier circuit, but also reduce power consumption and energy waste when no ground wire liveness is detected; and at the input end of the input circuit, a signal attenuation circuit is used in combination with the input circuit to make the circuit more stable, which can remove induced voltage, effectively reduce malfunctions, improve product stability, and further meet user needs. Attached Figure Description

[0015] Figure 1 This is a workflow control diagram of the present invention.

[0016] Figure 2 This is a schematic diagram illustrating the working principle of the signal attenuation circuit incorporated in this invention.

[0017] The technical solutions in the embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figure 1 , Figure 2As shown, a live detection and control device and its control method include a live detection circuit 1, a resistor-capacitor step-down circuit 2, a rectifier circuit A3, a voltage regulator circuit 4, an energy-saving protection circuit 5, and a control circuit A6. The input terminal of the rectifier circuit 3 is electrically connected to the resistor-capacitor step-down circuit 2 and the neutral wire port 11, respectively, and the output terminal of the rectifier circuit 3 is electrically connected to the voltage regulator circuit 4. If the live detection circuit 1 does not detect a ground wire live signal, the energy-saving protection circuit 5 controls the positive terminal of the rectifier circuit 3 to be short-circuited to the negative terminal, or connected to a low-resistance resistor. If the live detection circuit 1 detects a ground wire live signal, the energy-saving protection circuit 5 controls the output terminal of the rectifier circuit A3 to be disconnected, or connected to a high-resistance resistor. The control circuit A6 operates, outputting a control voltage to provide operating voltage for the load.

[0018] The energy-saving protection circuit 5 controls the positive terminal of the rectifier circuit A3 to be short-circuited to the negative terminal, or connected to a low-resistance resistor. Since a live detection control device is in a detection state for a long time, especially for 24-hour uninterrupted real-time monitoring, when no live signal is detected, the current limiting of the capacitor and the AC characteristics are used to reduce the voltage at the output terminal of the rectifier circuit A3 to be lower than the voltage output of the voltage regulator circuit 4. This not only prevents the circuit from being overloaded and damaged, but also reduces the power consumption generated during voltage regulation, reducing the heat generation and energy loss of the voltage regulator circuit 4, especially the Zener diode, during no-load voltage regulation, thereby achieving the effect of energy-saving protection.

[0019] The present invention employs a 1.2 microfarad X-rated safety capacitor in the RC step-down circuit 2; a 1000V 1A rectifier bridge in the rectifier circuit A3; a 12V 5W Zener diode in the voltage regulator circuit 4; a 12V 30mA audible and visual alarm in the alarm 61; a 12V relay in the on / off switch 62; and a 30Ω 2W resistor in the energy-saving protection circuit 5 to control the low-resistance resistor. This ensures that the Zener diode is not damaged by overheating when the control circuit A6 is not driving a load, thus avoiding energy waste. Additionally, a dimly lit power indicator light can be installed at the output of the rectifier circuit 3.

[0020] A signal attenuation circuit 7 is provided between the input terminal of the live detection circuit 1 and the neutral wire port 11; the signal attenuation circuit 7 is a resistor, a capacitor, or other components that can withstand high voltage.

[0021] When the signal attenuation circuit 7 is set as capacitor A, its capacitance is equal to or greater than the capacitance of capacitor B in the signal input circuit of detection circuit 1.

[0022] When the signal attenuation circuit 7 is set as resistor A, its resistance value is equal to or less than the resistance value of resistor B in the signal input circuit of detection circuit 1.

[0023] The signal attenuation circuit 7 can be configured as any combination of resistors and capacitors. This enables accurate control of the detection voltage, avoids circuit activation caused by weak induced signals, and improves its operational stability.

[0024] like Figure 1 , Figure 2 As shown, a live control device includes a neutral wire port 11, a ground wire port 12, an input circuit 13, a signal attenuation circuit 7, a rectifier circuit B31, and a control circuit B32. The device is characterized in that: the neutral wire port 11 is electrically connected to one end of the input terminal of the rectifier circuit B31; the ground wire port 12 is electrically connected to the other end of the input terminal of the rectifier circuit B31 via the input circuit 13, and the input circuit 13 is equipped with the signal attenuation circuit 7; the control circuit B32 is connected in series between the positive and negative terminals of the output terminal of the rectifier circuit B31. In this embodiment, the signal attenuation circuit 7 uses a 103Y1 capacitor, and the input circuit 13 uses a 472Y1 capacitor. By limiting the input current of the detection circuit 1 through the signal attenuation circuit 7 and the input circuit 13, high voltage resistance and better stability are achieved.

[0025] The input circuit 13 is set as capacitor B, and the signal attenuation circuit 7 is set as capacitor A. The capacitance of capacitor A is greater than that of capacitor B, which improves the working stability and prevents weak signals from starting.

[0026] like Figure 1 As shown, a control method 1 for a live detection control device includes a live detection circuit 1, a resistor-capacitor step-down circuit 2, a rectifier circuit A3, a voltage regulator circuit 4, an energy-saving protection circuit 5, and a control circuit A6. The input terminal of the rectifier circuit 3 is electrically connected to the resistor-capacitor step-down circuit 2, and the output terminal of the rectifier circuit 3 is connected to the voltage regulator circuit 4. If the live detection circuit 1 does not detect a live signal, the energy-saving protection circuit 5 operates, short-circuiting the positive and negative terminals of the rectifier circuit 3. If the live detection circuit 1 detects a live signal, the energy-saving protection circuit 5 controls the short-circuit connection of the rectifier circuit 3 to be disconnected. The control circuit A6 operates, outputting a control voltage to provide operating voltage for the load. Control steps: Step 1: When the power is turned on, if the detection circuit 1 does not detect that the ground wire is live, the energy-saving protection circuit 5 will short-circuit the output terminal of the rectifier circuit 3, so that the output voltage of the rectifier circuit 3 is lower than the voltage regulation value of the voltage regulator circuit 4; the voltage regulator circuit 4 will not work.

[0027] Step 2: When the detection circuit 1 detects that the ground wire is energized, the energy-saving protection circuit 5 controls the output terminal of the rectifier circuit 3 to be disconnected or to have a high resistance value, so that the output voltage of the rectifier circuit 3 is higher than the voltage regulation value of the voltage regulator circuit 4, and the voltage regulator circuit 4 works; the control circuit A6 works and outputs the control voltage to power the load.

[0028] like Figure 1As shown, a control method 2 for a live detection control device includes a live detection circuit 1, a resistor-capacitor step-down circuit 2, a rectifier circuit A3, a voltage regulator circuit 4, an energy-saving protection circuit 5, and a control circuit A6. The method is characterized in that: the input terminal of the rectifier circuit 3 is electrically connected to the resistor-capacitor step-down circuit 2, and the output terminal of the rectifier circuit 3 is connected to the voltage regulator circuit 4; when the live detection circuit 1 does not detect a live signal, the energy-saving protection circuit 5 operates, connecting the positive terminal of the rectifier circuit 3's output terminal to a low-resistance resistor; when the live detection circuit 1 detects a live signal, the energy-saving protection circuit 5 controls the output terminal of the rectifier circuit 3 to be either disconnected or connected to a high-resistance resistor, making the output voltage of the rectifier circuit 3 higher than the regulated voltage; the control circuit A6 operates, outputting a control voltage to provide operating voltage for the load. Control steps: Step 1: When the power is turned on, if the detection circuit 1 does not detect that the ground wire is live, the energy-saving protection circuit 5 controls the output terminal of the rectifier circuit 3 to be connected to a low-resistance resistor, so that the output voltage of the rectifier circuit 3 is lower than the voltage regulation value of the voltage regulator circuit 4; the voltage regulator circuit 4 does not work; the control circuit A6 outputs a control voltage to control the load to not work. Step 2: When the detection circuit 1 detects that the ground wire is energized, the energy-saving protection circuit 5 controls the output terminal of the rectifier circuit 3 to be disconnected or to have a high resistance value, so that the output voltage of the rectifier circuit 3 is higher than the voltage regulation value of the voltage regulator circuit 4, and the voltage regulator circuit 4 works; the control circuit A6 outputs the control voltage to control the load to work.

[0029] like Figure 2 As shown, the working process is as follows: 1. In this embodiment, the ground wire port 12 is set as a detection port. When the ground wire is detected to be energized, most of the weak current goes directly to the neutral wire port 11 through the signal attenuation circuit 7, reducing the voltage at the input terminal of the input circuit 13, ensuring that the control circuit B32 is not conducting, and the optocoupler 33 has no control signal output. At this time, the live wire port 111 and the neutral wire port 11 are connected to the rectifier circuit A3 through the RC step-down circuit 2. The energy-saving protection circuit 5 controls the output terminal of the rectifier circuit A3 to be short-circuited, so that the voltage at the output terminal of the rectifier circuit A3 is lower than the regulated voltage value of the voltage regulator circuit 4. At this time, the control circuit A6 has no control voltage output, and the alarm does not work.

[0030] 2. When the ground wire is detected to be live, a large current flows directly to the neutral wire port 11 through the signal attenuation circuit 7. This current is insufficient to reduce the voltage at the input terminal of the input circuit 13, thus achieving the operating voltage for the control circuit B32 to conduct. The optocoupler 33 outputs a control signal. The energy-saving protection circuit 5 controls the output terminal of the rectifier circuit A3 to disconnect. At this time, the control circuit A6 operates, and the output control voltage controls the alarm to operate.

[0031] The above provides a further description of an embodiment of the live detection control device and control method of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. For those skilled in the art, based on the ideas of the present invention, there will be changes in specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A ground wire live detection and control device and its control method, comprising a live detection circuit (1), a resistor-capacitor step-down circuit (2), a rectifier circuit A (3), a voltage regulator circuit (4), an energy-saving protection circuit (5), and a control circuit A (6); characterized in that: The input terminal of the rectifier circuit (3) is electrically connected to the resistor-capacitor step-down circuit (2) and the neutral terminal (11), respectively. The output terminal of the rectifier circuit A (3) is electrically connected to the voltage regulator circuit (4). If the live detection circuit (1) does not detect a live ground signal, the energy-saving protection circuit (5) controls the positive terminal of the output terminal of the rectifier circuit A (3) to be short-circuited to the negative terminal, or connected to a low-resistance resistor. If the live detection circuit (1) detects a live ground signal, the energy-saving protection circuit (5) controls the output terminal of the rectifier circuit A (3) to be disconnected, or connected to a high-resistance resistor. The control circuit A (6) operates and outputs a control voltage to provide working voltage for the load.

2. The ground wire live detection and control device according to claim 1, characterized in that: The energy-saving protection circuit (5) is set to a low resistance value, and the output terminal of the rectifier circuit A (3) is equipped with a power indicator light; the low resistance value is set between 10-100Ω.

3. The ground wire liveness detection and control device according to claim 1, characterized in that: A signal attenuation circuit (7) is provided between the input terminal of the live detection circuit (1) and the neutral wire port (11).

4. The ground wire liveness detection and control device according to claim 3, characterized in that: The signal attenuation circuit (7) is set as capacitor A, whose capacity is equal to or greater than the capacity of the signal input capacitor B of the detection circuit (1).

5. The live-line detection and control device according to claim 3, characterized in that: The signal attenuation circuit (7) is set as resistor A, whose resistance is equal to or less than the signal input resistance B of the detection circuit (1).

6. The ground wire liveness detection and control device according to claim 3, characterized in that: The signal attenuation circuit (7) is set to any combination of resistors and capacitors.

7. A ground wire energized control device, comprising a neutral wire port (11), a ground wire port (12), an input circuit (13), a signal attenuation circuit (7), a rectifier circuit B (31), and a control circuit B (32); characterized in that: The neutral wire port (11) is electrically connected to one end of the input terminal of the rectifier circuit B (31); the ground wire port (12) is electrically connected to the other end of the input terminal of the rectifier circuit B (31) via the input circuit (13), and the input circuit (13) is provided with a signal attenuation circuit (7); the control circuit B (32) is connected in series between the positive and negative terminals of the output terminal of the rectifier circuit B (31).

8. The ground wire live detection and control device according to claim 7, characterized in that: The input circuit (13) is set as capacitor B, and the signal attenuation circuit (7) is set as capacitor A, with the capacitance of capacitor A being greater than that of capacitor B.

9. A control method 1 for a ground wire live detection and control device: comprising a live detection circuit (1), a resistor-capacitor step-down circuit (2), a rectifier circuit A (3), a voltage regulator circuit (4), an energy-saving protection circuit (5), and a control circuit A (6); characterized in that: The input terminal of rectifier circuit A (3) is electrically connected to resistor-capacitor step-down circuit (2), and the output terminal of rectifier circuit A (3) is connected to voltage regulator circuit (4); when the live detection circuit (1) does not detect a live signal, the energy-saving protection circuit (5) works, causing the positive terminal of the output terminal of rectifier circuit A (3) to be short-circuited to the negative terminal; when the live detection circuit (1) detects a live signal, the energy-saving protection circuit (5) controls the short-circuit connection of rectifier circuit A (3) to be disconnected; the control circuit A (6) works, outputting control voltage to provide working voltage for the load; Control steps: Step 1: Turn on the power. When the detection circuit (1) does not detect that the ground wire is charged, the energy-saving protection circuit (5) controls the output terminal of the rectifier circuit A (3) to be short-circuited, so that the output voltage of the rectifier circuit A (3) is lower than the voltage regulated by the voltage regulator circuit (4). The voltage regulator circuit (4) is not working. Step 2: When the detection circuit (1) detects that the ground wire is energized, the energy-saving protection circuit (5) controls the output terminal of the rectifier circuit A (3) to be disconnected or to have a high resistance value, so that the output voltage of the rectifier circuit A (3) is higher than the voltage regulation value of the voltage regulator circuit (4), and the voltage regulator circuit (4) works; the control circuit A (6) works and outputs the control voltage to power the load.

10. A control method 2 for a ground wire live detection and control device: comprising a live detection circuit (1), a resistor-capacitor step-down circuit (2), a rectifier circuit A (3), a voltage regulator circuit (4), an energy-saving protection circuit (5), and a control circuit A (6); characterized in that: The input terminal of rectifier circuit A (3) is electrically connected to the resistor-capacitor step-down circuit (2), and the output terminal of rectifier circuit A (3) is connected to the voltage regulator circuit (4). When the live detection circuit (1) does not detect a live signal, the energy-saving protection circuit (5) operates, so that the positive terminal of the output terminal of rectifier circuit A (3) is connected to the negative terminal with a low-resistance resistor. When the live detection circuit (1) detects a live signal, the energy-saving protection circuit (5) controls the output terminal of rectifier circuit A (3) to be either disconnected or connected with a high-resistance resistor, so that the output voltage of rectifier circuit A (3) is higher than the regulated voltage. When the control circuit A (6) operates, it outputs a control voltage to provide working voltage for the load. Control steps: Step 1: Turn on the power. When the detection circuit (1) does not detect that the ground wire is live, the energy-saving protection circuit (5) controls the output terminal of the rectifier circuit A (3) to be connected to a low-resistance resistor, so that the output voltage of the rectifier circuit A (3) is lower than the voltage regulation value of the voltage regulator circuit (4); the voltage regulator circuit (4) does not work; the control circuit A (6) outputs the control voltage to control the load to not work. Step 2: When the detection circuit (1) detects that the ground wire is energized, the energy-saving protection circuit (5) controls the output terminal of the rectifier circuit A (3) to be disconnected or to have a high resistance value, so that the output voltage of the rectifier circuit A (3) is higher than the voltage regulation value of the voltage regulator circuit (4), and the voltage regulator circuit (4) works; the control circuit A (6) outputs the control voltage to control the load to work.

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