CN108400499B - Intelligent socket with protection function - Google Patents

Abstract

The invention provides an intelligent socket with a protection function, which comprises a socket circuit module, a relay control switch circuit module, an MCU control circuit module, a detection circuit module and a communication interface module; the relay control switch circuit module is connected in series on the power line, the control end of the relay control switch circuit module is electrically connected with the MCU control circuit module, and the power line is cut off/connected according to a control instruction of the MCU control circuit module; the detection circuit module comprises a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit and a temperature detection circuit; the MCU control circuit module generates a cut-off signal in response to any one of 1) the first voltage detection signal being greater than a first voltage threshold, 2) the second voltage detection signal being greater than a second voltage threshold, 3) the leakage signal transmitted by the leakage detection circuit, 4) the third voltage detection signal being less than a third voltage threshold. The intelligent socket can ensure the safe use of the intelligent socket from multiple aspects, and occupies less volume resources.

Description

Smart socket with protection function

technical field

The invention relates to the field of smart home, in particular to a smart socket with protection function.

Background technique

The smart socket makes use of the WiFi network in the existing home, so that the user's smart phone or tablet computer can turn on or off the specified electrical appliances through the App operation under the condition of networking. Moreover, because the smart socket can completely cut off the power of the electrical appliances, for the electrical appliances with high power waiting for the TV set and electric water heater, they can be turned on and off after being controlled by the smart socket, and considerable savings can be saved every month. electricity bills.

But because of this, since the purpose of the smart socket is to achieve remote control, when the socket fails, the user cannot quickly find the problem and cut off the power to prevent a wider range of losses.

The current smart socket is limited by the overall size, and has built-in control chips and communication modules, etc., which cannot accommodate the existing circuit protection modules.

Contents of the invention

The purpose of the present invention is to provide a smart socket with a protection function, which has a detection circuit module including a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit, and a temperature detection circuit, so as to ensure the safe use of the smart socket from various aspects, and Only takes up less volume resources.

In order to achieve the above purpose, the present invention refers to a smart socket with protection function, which includes a socket circuit module, a relay control switch circuit module, an MCU control circuit module, a detection circuit module, and a communication interface module;

The socket circuit module includes a mains connection end, a power cord, and a power supply end. The mains connection end is used to connect to the mains, and transmits the mains power to the power supply end through the power line, and the power line includes live wires and neutral wires;

The relay control switch circuit module is connected in series on the power line, its control terminal is electrically connected to the MCU control circuit module, and the power line is cut off/conducted according to the control instruction of the MCU control circuit module;

The communication interface module is electrically connected to the MCU control circuit module to realize the data interaction between the MCU control circuit module and the client;

The detection circuit module includes a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit, and a temperature detection circuit;

The voltage detection circuit includes a first bridge rectifier, a first step-down unit, a second step-down unit, a single voltage conversion unit and a first filter unit electrically connected in sequence;

Both the first step-down unit and the second step-down unit have two input ends and two output ends, and the single voltage conversion unit has two input ends and one output end;

The two input ends of the first bridge rectifier are electrically connected to the power line, and the two output ends of the first bridge rectifier are electrically connected to the two input ends of the first step-down unit;

The two input ends of the second step-down unit are electrically connected to the two output ends of the first step-down unit, and the two output ends of the second step-down unit are electrically connected to the two input ends of the single-voltage conversion unit;

The first bridge rectifier is used to convert the AC power flowing through the power line into DC power, and then transmit the converted DC power to the first step-down unit, and the DC power is successively stepped down by the first step-down unit and the second step-down unit Afterwards, it is transmitted to the single-voltage conversion unit, and the single-voltage conversion unit outputs a first voltage detection signal;

The first filter unit is electrically connected to the output end of the single voltage conversion unit and the MCU control circuit module respectively, and transmits the first voltage detection signal generated by the single voltage conversion unit to the MCU control circuit module after filtering;

The overcurrent detection circuit includes a first current sampling unit, an amplification unit, and a second filter unit electrically connected in sequence, and the output end of the second filter unit is electrically connected to the MCU control circuit module;

The first current sampling unit is electrically connected to the live line of the power line, senses the current flowing through the live line and converts the sensed current into a first induced voltage;

The first induced voltage is amplified by the amplification unit, filtered by the second filter unit, converted into a second voltage detection signal and transmitted to the MCU control circuit module;

The leakage detection circuit includes a second current sampling unit and a leakage protection chip that are electrically connected to each other. The second current sampling unit is electrically connected to the live wire and the neutral wire of the power line, and obtains the current flow through the ground by comparing the difference between the live wire and the neutral wire. Line leakage current and convert the acquired leakage current into a second induced voltage, the second induced voltage is transmitted to the leakage protection chip, and the leakage protection chip sends a leakage signal to the MCU control circuit in response to the second induced voltage exceeding the set threshold module;

The temperature detection circuit includes a voltage dividing resistor and a thermistor electrically connected to each other, one end of the voltage dividing resistor not connected to the thermistor is connected to a stabilized power supply, and one end of the thermistor not connected to the voltage dividing resistor is grounded, and the thermal One end of the sensitive resistor connected to the voltage dividing resistor is electrically connected to the MCU control circuit module, and the voltage at the connection point is defined as the third voltage detection signal;

The MCU control circuit module responds to any one of the following conditions, 1) the first voltage measurement signal is greater than the first voltage threshold, 2) the second voltage detection signal is greater than the second voltage threshold, 3) the leakage signal sent by the leakage detection circuit , 4) The third voltage detection signal is less than the third voltage threshold, generating a cut-off signal;

The MCU control circuit module has a setting part for setting the first voltage threshold, the second voltage threshold, and the third voltage threshold;

The relay control switch circuit module cuts off the power line of the socket circuit module in response to the cutoff instruction of the MCU control circuit module.

Compared with the existing ones, the above technical solution of the present invention has a significant beneficial effect in that it has a detection circuit module including a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit, and a temperature detection circuit, ensuring that Safe use of smart sockets, and only occupy less volume resources.

It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent. Additionally, all combinations of claimed subject matter are considered a part of the inventive subject matter of this disclosure.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description when taken in conjunction with the accompanying drawings. Other additional aspects of the invention, such as the features and/or advantages of the exemplary embodiments, will be apparent from the description below, or learned by practice of specific embodiments in accordance with the teachings of the invention.

Description of drawings

The figures are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like reference numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of the various aspects of the invention will now be described by way of example with reference to the accompanying drawings, in which:

Fig. 1 is a schematic structural diagram of a smart socket with a protection function according to the present invention.

Fig. 2 is the structural representation of the voltage detection circuit of the present invention

FIG. 3 is a schematic structural diagram of the overcurrent detection circuit of the present invention.

Fig. 4 is a structural schematic diagram of the electric leakage detection circuit of the present invention.

Fig. 5 is a structural schematic diagram of the temperature detection circuit of the present invention.

Fig. 6 is a schematic structural diagram of the AC-DC isolated power supply module of the present invention.

FIG. 7 is a schematic structural diagram of the voltage conversion circuit of the present invention.

Detailed ways

In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

Aspects of the invention are described in this disclosure with reference to the accompanying drawings, which show a number of illustrated embodiments. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

Referring to Fig. 1, the present invention mentions a smart socket with protection function, which includes a socket circuit module, a relay control switch circuit module, an MCU control circuit module, a detection circuit module, and a communication interface module.

The socket circuit module includes a mains connection end, a power cord, and a power supply end. The mains connection end is used to connect to the mains power and transmit the mains power to the power supply end through the power line. The power line includes a live wire and a neutral wire.

The relay control switch circuit module is connected in series on the power line, and its control terminal is electrically connected to the MCU control circuit module, and the power line is cut off/on according to the control instruction of the MCU control circuit module.

The MCU control circuit module includes an ESP32 chip.

The communication interface module is electrically connected to the MCU control circuit module to realize data interaction between the MCU control circuit module and the user end.

For example, the MCU control circuit module is connected to the network through the communication interface module, and then realizes data interaction with the user's mobile phone and PC through the network. The user sends control commands to the MCU control circuit module remotely through the mobile phone and PC to cut off or turn on the smart socket. , to indirectly realize the switch control of the electrical appliances connected to the smart socket.

In some examples, the smart socket also has a wifi indicator, and the wifi indicator is electrically connected to the MCU control circuit module to reflect the communication status of the MCU control circuit module.

The smart socket also has a touch switch module.

The touch switch module includes two touch keys and a single-key touch chip, the two touch keys are electrically connected to the input end of the single-key touch chip, and the output end of the single-key touch chip is electrically connected to the MCU control circuit module.

The single-key touch chip adopts UTouth01B.

The smart socket has a touch indicator light, and the touch indicator light is electrically connected to the MCU control circuit module to visually reflect the working state of the smart socket.

During the use of smart sockets, the faults that usually occur generally include overvoltage, overcurrent, overload, leakage, loosening, short circuit, etc. For these types of faults, the detection circuit module of the present invention is designed as follows:

The detection circuit module includes a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit, and a temperature detection circuit.

Each detection circuit of the detection circuit module will be described separately below. It should be understood that the following detection circuits need to use the most compact structure to achieve as comprehensive fault detection as possible, so as to prevent the smart socket from being too large and resulting in increased costs. These are the following detection circuits for the smart socket The commonality of the structural design of the circuit.

1. Voltage detection circuit

The voltage value on the power line is very high, such as 220V AC mains. It is very dangerous and impractical to directly determine the voltage of such a high amplitude. The present invention detects the high voltage flowing through the power line The mains power is converted into a first voltage detection signal with a lower amplitude, which is used for determination by the MCU control circuit module.

Referring to FIG. 2 , the voltage detection circuit includes a first bridge rectifier 11 , a first step-down unit 12 , a first step-down unit 13 , a single voltage conversion unit 14 and a first filter unit 15 electrically connected in sequence.

Both the first step-down unit 12 and the first step-down unit 13 have two input terminals and two output terminals, and the single voltage conversion unit 14 has two input terminals and one output terminal.

The two input ends of the first bridge rectifier 11 are electrically connected to the power line, and the two output ends of the first bridge rectifier 11 are electrically connected to the two input ends of the first step-down unit 12 .

The two input ends of the first step-down unit 13 are electrically connected to the two output ends of the first step-down unit 12, and the two output ends of the first step-down unit 13 are electrically connected to the two output ends of the single voltage conversion unit 14. input.

The first bridge rectifier 11 is used to convert the alternating current flowing through the power line into direct current, and then transmit the converted direct current to the first step-down unit 12, and the direct current passes through the first step-down unit 12, the first step-down unit 13 is sequentially lowered and then transmitted to the single voltage conversion unit 14, and the single voltage conversion unit 14 outputs a first voltage detection signal.

The first filter unit 15 is electrically connected to the output terminal of the single voltage conversion unit 14 and the MCU control circuit module, and transmits the first voltage detection signal generated by the single voltage conversion unit 14 to the MCU control circuit module after filtering.

For example, the mains electricity flowing through the power line is 220V alternating current, which is converted into 308V direct current after being rectified by the first bridge rectifier 11. Referring to Figure 2, pins 2 and 3 of the first bridge rectifier 11 are electrically connected to the power supply Line, No. 1 pin outputs DC high voltage 308V, and No. 4 pin outputs DC high voltage 0V. The first bridge rectifier 11 converts the AC power on the power line into DC power and transmits it to the first step-down unit 12 .

Considering that the first bridge rectifier 11 has two output terminals, the first step-down unit 12 and the first step-down unit 13 are all symmetrical structures.

One side of the symmetrical structure of the first step-down unit 12 includes at least two voltage-dividing resistors R1 and R2. The resistance ratio between the two voltage-dividing resistors is relatively large for two purposes:

The first purpose is voltage division. Taking the output DC 308V as an example, assuming that the resistance ratio of R1 and R2 is 20:1, the voltage at point A in Figure 2 is about 14-15V.

The second purpose is to isolate the high voltage. It should be understood that the connection pins of the first bridge rectifier 11 are all high voltage, which poses a threat to the personal safety of the user. Setting two voltage dividing resistors with a larger resistance ratio can realize effective Isolate the function of high voltage to protect the safety of smart sockets.

The voltage at point A is transmitted to the first step-down unit 13 for further step-down. The first step-down unit 13 is composed of two symmetrical resistors. The voltage signal at point B after the step-down by the first step-down unit 13 is about It is about 2V to ensure the safety of electrical appliances and users.

Correspondingly, the voltage signal of B' is the same as point B, about 2V.

It can be seen from the foregoing that after further step-down by the first step-down unit 13, the current voltage detection circuit has two identical output voltage terminals. combined into one output voltage terminal. In the present invention, we realize it through a differential amplifier, and the two input terminals of the differential amplifier are respectively electrically connected to a resistor of the same resistance value, so as to realize the output of the original multiple single voltage, and the output voltage is defined as the first voltage detection signal .

The first voltage detection signal is filtered by the first filter unit 15 and then sent to the MCU control circuit module. The first filter unit 15 is an RC loop. Once the first voltage detection signal exceeds the set first voltage threshold, the MCU control circuit module That is, it is determined that the voltage flowing through the power line of the smart socket has been overvoltage. For example, the normal output value of the first voltage detection signal is 2V, and the first voltage threshold value is 2.5V. The smart socket is used abnormally, and the power cord needs to be cut off as soon as possible.

2. Overcurrent detection circuit

The over-current detection circuit detects whether the current flowing through the power line exceeds the set threshold, such as when the socket is overloaded, but since the MCU control circuit module preferably processes voltage signals, the function of the over-current detection circuit is to pass through the power line The current is converted into a second voltage detection signal with a smaller amplitude, and the converted second voltage detection signal is sent to the MCU control circuit module for further determination.

Referring to FIG. 3 , the overcurrent detection circuit includes a first current sampling unit 21 , an amplification unit 22 , and a second filter unit 23 electrically connected in sequence, and the output terminal of the second filter unit 23 is electrically connected to the MCU control circuit module.

The first current sampling unit 21 is electrically connected to the live line of the power line, senses the current flowing through the live line and converts the sensed current into a first induced voltage.

The first induced voltage is amplified by the amplifying unit 22 and filtered by the second filtering unit 23, and then converted into a second voltage detection signal and transmitted to the MCU control circuit module.

Preferably, the second filtering unit 23 is also an RC loop, and the amplifying unit 22 can be an operational amplifier.

In some examples, the first current sampling unit 21 includes a first current transformer, a second bridge rectifier, a first sampling resistor, and a polar capacitor.

The input end of the first current transformer is electrically connected to the live wire of the power line, and the output end is electrically connected to the input end of the second bridge rectifier, so as to convert the large current on one side of the live wire into a first induced current with a smaller value, The first induced current is an alternating current, which needs to be rectified into direct current by the second bridge rectifier.

Both ends of the first sampling resistor are respectively electrically connected to two output terminals of the second bridge rectifier, and the first induced current rectified by the second bridge rectifier is converted into a first induced voltage.

The polarity capacitor is connected in parallel with both ends of the first sampling resistor to filter the first induced voltage.

In order to prevent the reverse polarity of the polarized capacitor, the present invention can also connect a non-polarized capacitor in parallel at both ends of the polarized capacitor to further ensure the safety of the overcurrent detection circuit.

A second voltage threshold is preset in the MCU control circuit module. When the second voltage detection signal exceeds the second voltage threshold, the MCU control circuit module determines that the current flowing through the smart socket is abnormal at this time, and there may be dangers such as overload and short circuit. electrical behavior, the power cord needs to be disconnected as soon as possible.

3. Leakage detection circuit

Leakage usually occurs when the socket is faulty, the socket is loose, etc. It is necessary to detect the leakage current flowing through the ground wire. Like the overcurrent detection circuit, in order to facilitate the processing of the MCU control circuit module, the detected leakage current needs to be converted into a voltage signal .

4, the leakage detection circuit includes a second current sampling unit 31 and a leakage protection chip electrically connected to each other, and the second current sampling unit 31 is electrically connected to the live wire and the neutral wire of the power line, and by comparing the current on the live wire and the neutral wire The difference value obtains the leakage current flowing through the ground wire and converts the obtained leakage current into a second induced voltage, and the second induced voltage is transmitted to the leakage protection chip, and the leakage protection chip responds to the second induced voltage exceeding the set threshold, and sends a The leakage signal is sent to the MCU control circuit module.

The leakage protection chip can be a VG54123A chip.

In other examples, the second current sampling unit 31 includes a second current transformer, a second sampling resistor, and a rectification unit.

The input terminals of the second current transformer are electrically connected to the live wire and the neutral wire of the power line respectively, and the output terminals are connected to both ends of the second sampling resistor. The second current transformer obtains the current difference by comparing the current difference between the neutral wire and the live wire. For the leakage current flowing through the ground wire, the second sampling resistor is used to convert the leakage current induced by the second current transformer into a voltage signal, and the voltage signal is rectified by the rectification unit to generate a second induced voltage.

Preferably, the rectification unit includes two diodes with opposite polarities connected in parallel at both ends of the second sampling resistor, so as to simplify the circuit structure as much as possible.

In order to ensure safe use of the leakage protection chip, a buffer resistor is connected in series between the rectification unit and the leakage protection chip.

4. Temperature detection circuit

When abnormalities such as overcurrent, overvoltage or looseness occur in the socket, electric sparks may occur, causing the temperature of the socket to rise. Therefore, the present invention designs a temperature detection circuit to determine whether the socket is overloaded or overloaded by detecting the temperature of the socket. flow, electric spark and other abnormalities.

In conjunction with Figure 5, the temperature detection circuit includes a voltage dividing resistor and a thermistor electrically connected to each other, one end of the voltage dividing resistor not connected to the thermistor is connected to a stabilized voltage power supply, and the thermistor is not connected to the voltage dividing resistor One end is grounded, and one end of the thermistor connected to the voltage dividing resistor is electrically connected to the MCU control circuit module, and the voltage at this connection point is defined as a third voltage detection signal.

For example, assuming that the initial resistance of the voltage dividing resistor and the thermistor are the same, the voltage of the regulated power supply is 5V, the voltage value of point C (the end where the thermistor is connected to the voltage dividing resistor) should be 2.5V, when the smart socket When the temperature rises, the resistance value of the thermistor decreases with the increase of temperature, and the voltage value of point C also decreases, and when it falls below the third voltage threshold, the MCU control circuit module determines that the temperature of the socket is abnormal at this time , there may be dangerous electricity use, cut off the power cord.

In summary, the MCU control circuit module responds to any one of the following conditions, 1) the first voltage measurement signal is greater than the first voltage threshold, 2) the second voltage detection signal is greater than the second voltage threshold, 3) leakage detection The leakage signal sent by the circuit, 4) the third voltage detection signal is less than the third voltage threshold, and a cut-off signal is generated.

The relay control switch circuit module is electrically connected to the socket circuit module and the MCU control circuit module respectively, and is cut off by cutting off the socket circuit module according to the cut-off instruction of the MCU control circuit module.

The MCU control circuit module has a setting part for setting the first voltage threshold, the second voltage threshold and the third voltage threshold to adapt to the application of the smart socket in different situations.

In some other examples, the smart socket also has an AC-DC isolated power module, and the AC-DC isolated power module is electrically connected between the power line and the MCU control circuit module.

The AC-DC isolated power module has two functions:

The first function is to convert the AC mains electricity flowing through the power line into DC low voltage for the MCU control circuit module and detection circuit module to work.

The second function is to isolate between the power line and the MCU control circuit module.

The AC-DC isolated power supply module can design its own circuit by referring to the examples in the prior art, such as shown in Figure 6, or use existing AC-DC isolated power supply chips, such as SM7205 and so on.

The voltage generated by the AC-DC isolation power module in Figure 6 is 5V, and the working voltage of the MCU control circuit module is 3.3V. Therefore preferably, the present invention also includes a power supply module, the power supply module includes a first regulated power supply and a voltage conversion circuit electrically connected to each other, and the output voltage of the first regulated power supply is converted by the voltage conversion circuit to form a second regulated power supply. voltage source. For example, the first regulated power supply is the output terminal of the AC-DC isolated power module, assuming it is 5V, the 5V voltage is converted by the voltage conversion circuit to generate an output voltage of 3.3V, and the output voltage of 3.3V is used as the second regulated voltage power usage.

FIG. 7 is a structural diagram of one of the voltage conversion circuits.

Therefore, the present invention refers to a smart socket with protection function, which has a detection circuit module including a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit, and a temperature detection circuit, so as to ensure the safe use of the smart socket from various aspects. And it only takes up less volume resources.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (10)

1. The intelligent socket with the protection function is characterized by comprising a socket circuit module, a relay control switch circuit module, an MCU control circuit module, a detection circuit module and a communication interface module;

the socket circuit module comprises a mains supply connecting end, a power line and a power supply end, wherein the mains supply connecting end is used for connecting with the mains supply, and the mains supply is transmitted to the power supply end through the power line, and the power line comprises a live wire and a zero wire;

the relay control switch circuit module is connected in series on the power line, the control end of the relay control switch circuit module is electrically connected with the MCU control circuit module, and the power line is cut off/connected according to a control instruction of the MCU control circuit module;

the communication interface module is electrically connected to the MCU control circuit module and used for realizing data interaction between the MCU control circuit module and the user side;

the detection circuit module comprises a voltage detection circuit, an overcurrent detection circuit, a leakage detection circuit and a temperature detection circuit;

the voltage detection circuit comprises a first bridge rectifier, a first voltage reduction unit, a second voltage reduction unit, a single voltage conversion unit and a first filtering unit which are electrically connected in sequence;

the first voltage reduction unit and the second voltage reduction unit are respectively provided with two input ends and two output ends, and the single voltage conversion unit is provided with two input ends and one output end;

the two input ends of the first bridge rectifier are electrically connected with the power line, and the two output ends of the first bridge rectifier are electrically connected with the two input ends of the first voltage reduction unit;

the two input ends of the second voltage reduction unit are electrically connected with the two output ends of the first voltage reduction unit, and the two output ends of the second voltage reduction unit are electrically connected to the two input ends of the single voltage conversion unit;

the first bridge rectifier is used for converting alternating current flowing through the power line into direct current, transmitting the direct current generated by conversion to the first voltage reduction unit, sequentially reducing the direct current by the first voltage reduction unit and the second voltage reduction unit, transmitting the direct current to the single voltage conversion unit, and outputting a first voltage detection signal by the single voltage conversion unit;

the first filtering unit is respectively and electrically connected with the output end of the single voltage conversion unit and the MCU control circuit module, and is used for filtering a first voltage detection signal generated by the single voltage conversion unit and then transmitting the first voltage detection signal to the MCU control circuit module;

the overcurrent detection circuit comprises a first current sampling unit, an amplifying unit and a second filtering unit which are electrically connected in sequence, and the output end of the second filtering unit is electrically connected to the MCU control circuit module;

the first current sampling unit is electrically connected with a live wire of the power wire, senses current flowing through the live wire and converts the sensed current into a first induced voltage;

the first induced voltage is amplified by the amplifying unit, filtered by the second filtering unit and then converted into a second voltage detection signal, and the second voltage detection signal is transmitted to the MCU control circuit module;

the leakage detection circuit comprises a second current sampling unit and a leakage protection chip which are electrically connected with each other, the second current sampling unit is electrically connected with a live wire and a zero wire of the power line, the leakage current flowing through the ground wire is obtained by comparing the difference value of the currents on the live wire and the zero wire, the obtained leakage current is converted into a second induced voltage, the second induced voltage is transmitted to the leakage protection chip, and the leakage protection chip responds to the second induced voltage exceeding a set threshold value and sends a leakage signal to the MCU control circuit module;

the temperature detection circuit comprises a voltage dividing resistor and a thermistor which are electrically connected with each other, wherein one end of the voltage dividing resistor, which is not connected with the thermistor, is connected with a voltage stabilizing power supply, one end of the thermistor, which is not connected with the voltage dividing resistor, is grounded, one end of the thermistor, which is connected with the voltage dividing resistor, is electrically connected to the MCU control circuit module, and the voltage of the connection point is defined as a third voltage detection signal;

the MCU control circuit module responds to any one of the following conditions that 1) a first voltage detection signal is larger than a first voltage threshold value, 2) a second voltage detection signal is larger than a second voltage threshold value, 3) a leakage signal sent by a leakage detection circuit, 4) a third voltage detection signal is smaller than a third voltage threshold value, and a cut-off signal is generated;

the MCU control circuit module is provided with a setting part for setting a first voltage threshold, a second voltage threshold and a third voltage threshold;

the relay control switch circuit module responds to a cutting-off instruction of the MCU control circuit module to cut off a power line of the socket circuit module.

2. The intelligent socket with the protection function according to claim 1, wherein the first current sampling unit comprises a first current transformer, a second bridge rectifier, a first sampling resistor and a polarity capacitor;

the input end of the first current transformer is electrically connected with the live wire of the power wire, the output end of the first current transformer is electrically connected with the input end of the second bridge rectifier, and the current on one side of the live wire is converted into a first induction current and is transmitted to the second bridge rectifier;

two ends of the first sampling resistor are respectively and electrically connected with two output ends of the second bridge rectifier, and the first induced current rectified by the second bridge rectifier is converted into a first induced voltage;

the polar capacitor is connected in parallel to two ends of the first sampling resistor and is used for filtering the first induced voltage.

3. The intelligent socket with the protection function according to claim 1, wherein the second current sampling unit comprises a second current transformer, a second sampling resistor and a rectifying unit;

the input end of the second current transformer is respectively electrically connected with the live wire and the zero line of the power line, the output end of the second current transformer is connected to two ends of the second sampling resistor, the second current transformer is used for inducing leakage current flowing through the ground wire, the second sampling resistor is used for converting the leakage current induced by the second current transformer into a voltage signal, and the voltage signal is rectified by the rectifying unit to generate a second induced voltage.

4. The intelligent socket with the protection function according to claim 3, wherein the rectifying unit comprises two diodes which are connected in parallel at two ends of the second sampling resistor and have opposite polarities.

5. The intelligent socket with the protection function according to claim 3, wherein the rectifying unit and the leakage protection chip are connected in series with a buffer resistor.

6. The smart jack with protection function according to claim 1, further comprising an AC-DC isolated power module electrically connected between the power line and the MCU control circuit module.

7. The intelligent socket with the protection function according to claim 1, wherein the intelligent socket further comprises a wifi indicator lamp, and the wifi indicator lamp is electrically connected to the MCU control circuit module and used for reflecting the communication state of the MCU control circuit module.

8. The smart jack with protection function according to claim 1, wherein the smart jack further comprises a touch switch module;

the touch switch module comprises two touch keys and a single-key touch chip, wherein the two touch keys are electrically connected to the input end of the single-key touch chip, and the output end of the single-key touch chip is electrically connected to the MCU control circuit module;

and the single-key touch chip adopts UTouth01B.

9. The smart jack with protection function according to claim 8, wherein the smart jack has a touch indicator light electrically connected to the MCU control circuit module.

10. The smart jack with protection function according to claim 1, wherein the smart jack further comprises a power supply module; the power supply module comprises a first stabilized power supply and a voltage conversion circuit which are electrically connected with each other, and the output voltage of the first stabilized power supply is converted by the voltage conversion circuit to form a second stabilized power supply.

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