Over-temperature protection circuit applied to intelligent socket and intelligent socket

Abstract

The embodiment of the utility model discloses an over-temperature protection circuit applied to an intelligent socket and the intelligent socket, the circuit comprises an over-temperature latch module and a control module, and the control module is respectively connected with the over-temperature latch module and an input power supply; the over-temperature latch module outputs a low-level control signal when the working temperature of the intelligent socket is lower than a preset temperature; the controller is also used for outputting and latching a high-level control signal when the working temperature is greater than a preset temperature; the control module is used for conducting a power supply loop of an input power supply and the intelligent socket when receiving a low-level control signal; and the controller is also used for disconnecting the power supply loop when receiving the high-level control signal. According to the embodiment of the utility model, the over-temperature latch module used for detecting the working temperature is arranged, and the control signal is output when the intelligent socket is over-temperature, so that the control module disconnects the power supply loop of the intelligent socket, over-temperature detection and protection of the intelligent socket can be effectively realized, the reliability of the intelligent socket is improved, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to electronic technical field, especially a kind of over-temperature protection circuit and intelligent socket applied to intelligent socket. BACKGROUND

[0002] With the development of economy, intelligent home has also been greatly developed, among them, intelligent socket is a brand-new concept safety socket, it is the novel intelligent safety socket that is integrated one-way programmable automatic control safety energy-saving converter and appliance intelligent standby power-saving socket, and the main function of this type intelligent socket is power saving and safety.

[0003] The existing intelligent socket has the defects of easy over-temperature and over-current with long time load, which can easily lead to damage the socket, generally uses CPU to control switch, and the control circuit is complex, and the maintenance cost is high. UTILITY MODEL CONTENT

[0004] The embodiment of the utility model mainly solves the technical problem to provide a kind of over-temperature protection circuit and intelligent socket applied to intelligent socket, can solve the defect of existing intelligent socket with long time load easy over-temperature.

[0005] To solve the above technical problems, one technical scheme of the utility model is: provide a kind of over-temperature protection circuit applied to intelligent socket, including: over-temperature latching module and control module, the control module is connected with over-temperature latching module and input power respectively;When the working temperature of the intelligent socket is less than preset temperature, the over-temperature latching module outputs low-level control signal;Also used to output and latch high-level control signal when the working temperature is greater than preset temperature;The control module is used to turn on the power supply loop of input power and intelligent socket when receiving low-level control signal;Also used to disconnect the power supply loop when receiving high-level control signal.

[0006] In some embodiments, the over-temperature latching module constitutes a positive feedback loop with the control signal as the feedback signal, and when the control signal is high, the high-level control signal is latched.

[0007] In some embodiments, the over-temperature latch module comprises a temperature driving unit and an output feedback unit, the output feedback unit is connected with the temperature driving unit and the control module respectively, and the temperature driving unit is further connected with a first power supply; the temperature driving unit is configured to output a driving voltage in response to the working temperature under the output voltage of the first power supply; when the working temperature is less than the preset temperature, the driving voltage is less than a preset reference voltage; when the working temperature is greater than the preset temperature, the driving voltage is greater than the preset reference voltage; the output feedback unit is configured to output the low-level control signal when the driving voltage is less than the preset reference voltage, and is further configured to output the high-level control signal when the driving voltage is greater than the preset reference voltage.

[0008] In some embodiments, the output feedback unit is further configured to output the high-level control signal when the level of the control signal is greater than the preset reference voltage.

[0009] In some embodiments, the control module comprises a switch driving unit and a relay unit, the relay unit is connected with the input power supply and the switch driving unit respectively, and the switch driving unit is connected with the over-temperature latch module; the switch driving unit is configured to output a low-level switch signal when receiving the high-level control signal, and is further configured to output a high-level switch signal when receiving the low-level control signal; the relay unit is configured to turn on the power supply circuit when receiving the high-level switch signal, and is further configured to turn off the power supply circuit when receiving the low-level switch signal.

[0010] In some embodiments, the temperature driving unit comprises a thermistor RT1, a resistor R12 and a capacitor C8; a first end of the thermistor RT1 is connected with the first power supply, a second end of the thermistor RT1 is connected with a first end of the resistor R12, a first end of the capacitor C8 and a signal input end of the output feedback unit, and a second end of the resistor R12 and a second end of the capacitor C8 are grounded.

[0011] In some embodiments, the output feedback module comprises a comparator U2B, a resistor R10, a resistor R11, a resistor R13, a capacitor C7, a capacitor C9, a diode D2 and a diode D5; a first end of the resistor R10 and a second power supply, a first end of the resistor R11 and a first end of the capacitor C7 are connected, a second end of the resistor R10 and an inverting input terminal of the comparator U2B, a first end of the resistor R13 and a first end of the capacitor C9 are connected, a second end of the resistor R11 and an output terminal of the comparator U2B, an anode of the diode D5 and an anode of the diode D2 are connected, a cathode of the diode D2 and a non-inverting input terminal of the comparator U2B and an output terminal of the temperature feedback unit are connected, a cathode of the diode D5 and an input terminal of the control module are connected, a second end of the capacitor C7, a second end of the capacitor C9 and a second end of the resistor R13 are grounded.

[0012] In some embodiments, the switch driving unit comprises a triode Q1, a resistor R14, a resistor R15, a resistor R16, a resistor R17 and a capacitor C10, a base of the triode Q1 and a first end of the resistor R17, a first end of the capacitor C10 and a first end of the resistor R15 are connected, a second end of the resistor R15 and an output terminal of the over-temperature locking module are connected, a first end of the resistor R14 and a first power supply are connected, a second end of the resistor R14 and a first end of the resistor R16, a collector of the triode Q1 and a signal input terminal of the relay unit are connected, an emitter of the triode Q1, a second end of the resistor R17, a second end of the capacitor C10 and a second end of the resistor R16 are grounded.

[0013] In some embodiments, the relay unit comprises a MOS tube Q2, a diode D3 and a relay RLY1, a drain of the MOS tube Q2 and an anode of the diode D3 and a first coil end of the relay RLY1 are connected, a gate of the MOS tube Q2 and an output terminal of the switch driving unit are connected, a source of the MOS tube Q2 is grounded; a cathode of the diode D3 and a second coil end of the relay RLY1 and a second power supply are connected, a first connection end of the relay RLY1 and the input power supply are connected, a second connection end of the relay RLY1 and an output live end of the intelligent socket are connected.

[0014] To solve the above technical problems, another technical scheme adopted by the utility model is to provide an intelligent socket, which comprises the over-temperature protection circuit applied to the intelligent socket as described above.

[0015] The embodiment of the utility model has the advantages that: different from the prior art, the embodiment of the utility model sets the over-temperature latching module for detecting working temperature, outputs control signal when the intelligent socket over-temperature, makes control module disconnect the power supply circuit of intelligent socket, can effectively realize over-temperature detection and protection of intelligent socket, improves the reliability of intelligent socket, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of over-temperature protection circuit applied to intelligent socket provided by the embodiment of the utility model,

[0017] Figure 2 It is the structural schematic diagram of over-temperature latching module provided by the embodiment of the utility model,

[0018] Figure 3 It is the structural schematic diagram of control module provided by the embodiment of the utility model,

[0019] Figure 4 It is the circuit principle diagram of over-temperature latching module provided by the embodiment of the utility model,

[0020] Figure 5 It is the circuit principle diagram of control module provided by the embodiment of the utility model,

[0021] Figure 6 It is the structural schematic diagram of over-temperature protection circuit applied to intelligent socket provided by another embodiment of the utility model,

[0022] Figure 7 It is the structural schematic diagram of over-current latching module provided by the embodiment of the utility model,

[0023] Figure 8 It is the circuit principle diagram of over-current latching module provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the utility model, the utility model is explained in more detail below in combination with the drawings and specific embodiments.It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween.When an element is described as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween.The terms "vertical", "horizontal", "left", "right" and similar expressions used in the specification are only for illustrative purposes.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of "and / or" means any one or all possible combinations of one or more of the associated listed items.

[0026] To solve the problem of over-temperature of the existing intelligent socket, the application provides an over-temperature protection circuit applied to an intelligent socket, a structure diagram of which is shown in Figure 1 The over-temperature protection circuit applied to the intelligent socket includes an over-temperature latching module 100 and a control module 200. The control module 200 is connected with the over-temperature latching module 100, an input power supply 20 and the intelligent socket 30 respectively.

[0027] The over-temperature latching module 100 outputs a low-level control signal when the working temperature of the intelligent socket 30 is less than a preset temperature, and is also used for outputting and latching a high-level control signal when the working temperature of the intelligent socket 30 is greater than the preset temperature. As an example but not limitation, the preset temperature can be 90 degrees Celsius. When the working temperature of the intelligent socket 30 is less than 90 degrees Celsius, the over-temperature latching module 100 outputs a low-level control signal. When the working temperature of the intelligent socket 30 is greater than 90 degrees Celsius, the over-temperature latching module 100 outputs and latches a high-level control signal.

[0028] It should be noted that the implementation of latching is that the over-temperature latching module 100 constitutes a positive feedback loop with the control signal as a feedback signal, so as to latch the high-level control signal when the control signal is high.

[0029] The control module 200 is used for turning on a power supply loop of the input power supply 20 and the intelligent socket 30 when receiving the low-level control signal, and is also used for disconnecting the power supply loop when receiving the high-level control signal. Understandably, when the working temperature of the intelligent socket 30 is less than the preset temperature, the control module 200 turns on the power supply loop of the input power supply 20 and the intelligent socket 30. When the working temperature of the intelligent socket 30 is greater than the preset temperature, the control module 200 disconnects the power supply loop of the input power supply 20 and the intelligent socket 30.

[0030] In some embodiments of the application, a structure diagram of the over-temperature latching module 100 is shown in Figure 2 The over-temperature latching module 100 includes a temperature driving unit 110 and an output feedback unit 120. The output feedback unit 120 is connected with the temperature driving unit 110 and the control module 200 respectively, and the temperature driving unit 110 is also connected with a first power supply 40.

[0031] The temperature driving unit 110 is configured to output a driving voltage responsive to the working temperature under the output voltage of the first power supply 40. The temperature driving unit 110 can be implemented by a temperature sensor, and the temperature sensor is powered by the first power supply. The output signal of the temperature sensor varies according to the change of the working environment. As an example but not limitation, the temperature sensor is a thermistor, which can be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.

[0032] In the embodiments of the present application, when the working temperature is less than the preset temperature, the driving voltage is less than the preset reference voltage; and when the working temperature is greater than the preset temperature, the driving voltage is greater than the preset reference voltage.

[0033] The output feedback unit 120 is configured to output a low-level control signal when the driving voltage is less than the preset reference voltage, and output a high-level control signal when the driving voltage is greater than the preset reference voltage. In addition, the output feedback unit 120 is also configured to output a high-level control signal when the level of the control signal is greater than the preset reference voltage, so as to realize the signal latching function.

[0034] In some embodiments of the present application, a structural schematic diagram of the control module 200 is shown in FIG. 2. The control module 200 includes a switch driving unit 210 and a relay unit 220. The relay unit 220 is connected with the input power supply 20, the smart socket 30 and the switch driving unit 210 respectively, and the switch driving unit 210 is connected with the over-temperature latching module 100. Figure 3

[0035] The switch driving unit 210 is configured to output a low-level switch signal when receiving a high-level control signal, and output a high-level switch signal when receiving a low-level control signal. The relay unit 220 is configured to turn on the power supply loop between the input power supply 20 and the smart socket 30 when receiving a high-level switch signal, and configured to turn off the power supply loop between the input power supply 20 and the smart socket 30 when receiving a high-level switch signal.

[0036] In some embodiments of the present application, a circuit schematic diagram of the over-temperature latching module 100 is shown in FIG. 3. The temperature driving unit includes a thermistor RT1, a resistor R12 and a capacitor C8. The output feedback module includes a comparator U2B, a resistor R10, a resistor R11, a resistor R13, a capacitor C7, a capacitor C9, a diode D2 and a diode D5. Figure 4

[0037] ​​The first end of the thermistor RT1 is connected with the first power supply (for example, +3.3V), and the second end of the thermistor RT1 is connected with the first end of the resistor R12, the first end of the capacitor C8, the cathode of the diode D2 and the non-inverting input terminal of the comparator U2B, and the second end of the resistor R12 and the second end of the capacitor C8 are grounded GND.

[0038] The first end of the resistor R10 is connected with the second power supply (for example, +5V), the first end of the resistor R11 and the first end of the capacitor C7, the second end of the resistor R10 is connected with the inverting input terminal of the comparator U2B, the first end of the resistor R13 and the first end of the capacitor C9, the second end of the resistor R11 is connected with the output terminal of the comparator U2B, the anode of the diode D5 and the anode of the diode D2, the cathode of the diode D5 is connected with the input terminal of the control module, and the second end of the capacitor C7, the second end of the capacitor C9 and the second end of the resistor R13 are grounded GND.

[0039] In some embodiments of the present application, the circuit schematic of the control module 200 is as shown in Figure 5 wherein the switch driving unit 210 includes the transistor Q1, the resistor R14, the resistor R15, the resistor R16, the resistor R17 and the capacitor C10, and the relay unit 220 includes the MOS tube Q2, the diode D3 and the relay RLY1.

[0040] The drain of the MOS tube Q2 is connected with the anode of the diode D3 and the first coil end of the relay RLY1, and the source of the MOS tube Q2 is grounded. The base of the transistor Q1 is connected with the first end of the resistor R17, the first end of the capacitor C10 and the first end of the resistor R15, the second end of the resistor R15 is connected with the output terminal of the over-temperature latching module, the first end of the resistor R14 is connected with the first power supply (for example, +3.3V), the second end of the resistor R14 is connected with the first end of the resistor R16, the collector of the transistor Q1 and the gate of the MOS tube Q2, and the emitter of the transistor Q1, the second end of the resistor R17, the second end of the capacitor C10 and the second end of the resistor R16 are grounded GND.

[0041] The cathode of the diode D3 is connected with the second coil end of the relay RLY1 and the second power supply (for example, +5V), the first connection end of the relay RLY1 is connected with the input power IN-L, and the second connection end of the relay RLY1 is connected with the output live end OUT-L of the intelligent socket.

[0042] The specific working principle is as follows: after the intelligent socket is powered on, the relay RLY1 is automatically closed, after a load is inserted (namely, the intelligent socket is connected with the load), when the intelligent socket does not overheat, the resistance value of the thermistor RT1 is greater than that of the resistor R12, the voltage at the non-inverting input terminal of the comparator U2B is less than 1.65V (at this time, +5V charges the capacitor C8, the resistor R11=10K, the capacitor C8=100nF, the capacitor C8 needs 1.67V to charge for 1ms, the comparator U2B has been inverted), the output terminal of the comparator U2B outputs a low level, namely, the cathode of the diode D5 outputs a low level control signal RLY_L; when the intelligent socket overheats, the resistance value of the thermistor RT1 is less than that of the resistor R12, the voltage at the non-inverting input terminal of the comparator U2B is greater than 1.65V, the comparator U2B does not invert, the output terminal of the comparator U2B outputs a high level, which is pulled to 1.65V above through the diode D2, thereby locking the output level of the output terminal of the comparator U2B, namely, the cathode of the diode D5 continuously outputs a high level control signal RLY_L, which can be restored only after power-off and restart.

[0043] When the control signal RLY_L is a low level, the triode Q1 is not conductive, the gate of the MOS tube Q2 is a high level, the MOS tube Q2 is closed and conductive, namely, the relay RLY1 is in a default closed state after being powered on; when the intelligent socket overheats, the control signal RLY_L is a high level, the triode Q1 is conductive, the level of the gate of the MOS tube Q2 is pulled low, the MOS tube Q2 is not conductive, and the relay RLY1 is opened, thereby protecting the intelligent socket from being damaged.

[0044] Compared with the prior art, the embodiment of the utility model discloses a over-temperature latching module for detecting working temperature, and outputs a control signal when the intelligent socket overheats, so that the control module disconnects the power supply circuit of the intelligent socket, which can effectively realize over-temperature detection and protection of the intelligent socket, improve the reliability of the intelligent socket, and reduce the cost.

[0045] Further, the application embodiment also provides another over-temperature protection circuit applied to the intelligent socket, and a structure diagram thereof is shown in Figure 6 The over-temperature protection circuit applied to the intelligent socket comprises an over-temperature latching module 100, a control module 200 and an over-current latching module 300. The control module 200 is connected with the over-temperature latching module 100, the over-current latching module 300, an input power supply 20 and the intelligent socket 30 respectively.

[0046] The functions of the over-temperature latching module 100 and the control module 200 have been described in the above embodiments, and will not be repeated here. The over-current latching module 300 is configured to output a low-level control signal when the output current of the intelligent socket 30 is less than a preset current, and is also configured to output and latch a high-level control signal when the output current is greater than the preset current. By way of example but not limitation, the preset current can be 17A. When the output current of the intelligent socket 30 is less than 17A, the over-current latching module 300 outputs a low-level control signal. When the output current of the intelligent socket 30 is greater than 17A, the over-current latching module 300 outputs and latches a high-level control signal.

[0047] It should be noted that the implementation of latching is that the over-current latching module 300 forms a positive feedback loop with the control signal as the feedback signal, so as to latch the high-level control signal when the control signal is high.

[0048] The over-current latching module 300 is combined with the control module 200, so as to disconnect the power supply loop between the input power supply 20 and the intelligent socket 30 when the output current of the intelligent socket 30 is greater than the preset current.

[0049] In some embodiments of the present application, a structural schematic diagram of the over-current latching module 300 is shown in Figure 7 The over-current latching module 300 includes a sampling unit 310, an amplification unit 320 and a feedback unit 330. The amplification unit 320 is connected with the sampling unit 310 and the feedback unit 330 respectively. The feedback unit 330 is connected with the control module 200. The sampling unit 310 is connected with the output zero line end 31 of the intelligent socket 30.

[0050] The sampling unit 310 is configured to output a sampling voltage under the action of the output current. The amplification unit 320 is configured to amplify the sampling voltage and output a driving voltage. The feedback unit 330 forms a positive feedback loop with the control signal as the feedback signal. The feedback unit 330 is configured to output a low-level control signal when the driving voltage is less than a preset reference voltage, and is also configured to output and latch a high-level control signal when the driving voltage is greater than the preset reference voltage.

[0051] It should be noted that the feedback unit 330 is also configured to output a high-level control signal when the level of the control signal is greater than the preset reference voltage, so as to realize the signal latching function.

[0052] In the embodiments of the present application, the driving voltage is less than the preset reference voltage when the output current is less than the preset current, and the driving voltage is greater than the preset reference voltage when the output current is greater than the preset current.

[0053] In some embodiments of the present application, a circuit schematic diagram of the over-current latching module 300 is shown in Figure 8As shown, the sampling unit 310 includes a resistor R5, the amplifying unit 320 includes a resistor R3, a resistor R4, a resistor R6, a resistor R9, a capacitor C2, a capacitor C3, a capacitor C6 and an operational amplifier U1A, and the feedback unit 330 includes a comparator U2A, a resistor R1, a resistor R2, a resistor R7, a resistor R8, a capacitor C1, a capacitor C4, a capacitor C5, a diode D1 and a diode D4.

[0054] The first end of the resistor R5 and the first end of the resistor R4 are grounded, the second end of the resistor R5, an output zero line end OUT-N of the smart socket and the first end of the resistor R6 are connected, the first end of the capacitor C2 and the first end of the resistor R3 and a third power supply (for example, 1.65V) are connected, the second end of the resistor R3, the in-phase input end of the operational amplifier U1A, the second end of the resistor R4 and the second end of the capacitor C2 are connected.

[0055] The second end of the resistor R6, the inverting input end of the operational amplifier U1A, the first end of the resistor R9 and the first end of the capacitor C6 are connected, the first power input end of the operational amplifier U1A and the second power supply (for example, 5V) and the first end of the capacitor C3 are connected, the second end of the resistor R9, the second end of the capacitor C6, the output end of the operational amplifier U1A and the in-phase input end of the comparator U2A are connected, and the second end of the capacitor C3 is connected to GND.

[0056] The first power input end of the comparator U2A, the first end of the capacitor C1, the first end of the resistor R2 and the first end of the resistor R1 are connected, the inverting input end of the comparator U2A and the second end of the resistor R1, the first end of the resistor R8 and the first end of the capacitor C5 are connected, and the in-phase input end of the comparator U2A and the first end of the resistor R7, the first end of the capacitor C4 and the cathode of the diode D1 are connected.

[0057] The output end of the comparator U2A, the second end of the resistor R2, the anode of the diode D4 and the anode of the diode D1 are connected, the cathode of the diode D4 is connected to the input end of the control module, and the second end of the capacitor C1, the second power input end of the comparator U2A, the second end of the resistor R8, the second end of the capacitor C5, the second end of the resistor R7 and the second end of the capacitor C4 are grounded.

[0058] The specific working principle is as follows: after the smart socket is powered on, the relay RLY1 is automatically closed, after a load is inserted (that is, the port CN2 of the smart socket is connected with the load), when the output current of the smart socket to the load does not exceed the preset current, after the current sampling by the operational amplifier, the output voltage of the operational amplifier U1A is less than the preset voltage (in the embodiment of the application, the preset current is 17A, the output voltage of the third power supply is 1.65V, and thus the preset reference voltage of the operational amplifier U1A is 1.65+17*1.414*0.05=2.85V), the voltage of the non-inverting input terminal of the comparator U2A is less than the voltage of the inverting input terminal, the output terminal of the comparator U2A is level flipped, and the diode D4 outputs a low-level control signal RLY_L; when the output current of the smart socket to the load is overcurrent, that is, the output voltage of the operational amplifier U1A is greater than 2.85V, the voltage of the non-inverting input terminal of the comparator U2A is greater than the voltage of the inverting input terminal, the output terminal of the comparator U2A outputs a high level, the voltage of the non-inverting input terminal of the comparator U2A is pulled to be greater than 2.85V through the diode D1, so that the output terminal level of the comparator U2A is locked to be high, the diode D4 outputs a high-level control signal RLY_L, and the smart socket can be restored only after power-off and restart. The specific working principle of the over-temperature latching module has been described in the above embodiment, and thus is not described herein.

[0059] When the control signal RLY_L is low, the transistor Q1 is not conductive, the gate of the MOS tube Q2 is high, the MOS tube Q2 is driven to be closed and conductive, that is, the relay RLY1 is in a default closed state after being powered on; when the smart socket is over-temperature or over-current, the control signal RLY_L is high, the transistor Q1 is conductive, the level of the gate of the MOS tube Q2 is pulled low, the MOS tube Q2 is not conductive, and the relay RLY1 is opened, so as to protect the smart socket from being damaged.

[0060] Different from the prior art, the embodiment of the application sets the over-temperature latching module for detecting the working temperature and the over-current latching module for detecting the output current, respectively outputs the control signal when the smart socket is over-temperature and over-current, and makes the control module disconnect the power supply circuit of the smart socket, so that the over-temperature detection, over-current detection and protection of the smart socket can be effectively realized, the reliability of the smart socket is improved, and the cost is reduced.

[0061] Based on the over-temperature protection circuit applied to the smart socket provided in the above embodiment, the embodiment of the application further provides a smart socket.

[0062] It should be noted that the description and drawings of the utility model give the preferred embodiments of the utility model, however, the utility model can be realized through many different forms, and is not limited to the embodiments described in the description, the embodiments are not as additional limitation to the content of the utility model, the purpose of providing the embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Furthermore, the above technical features continue to combine, form various embodiments not listed above, which are considered as the range of the description of the utility model; further, for those skilled in the art, the above description can be improved or transformed, and all these improvements and transformations should belong to the protection scope of the utility model claims.

Claims

1. An over-temperature protection circuit applied to a smart socket, characterized in that, The circuit comprises a temperature over-locked module and a control module, the control module is connected with the temperature over-locked module and an input power supply respectively, the temperature over-locked module outputs a low-level control signal when the working temperature of the smart socket is less than a preset temperature, and the temperature over-locked module outputs and locks a high-level control signal when the working temperature is greater than the preset temperature, the control module turns on a power supply loop of the input power supply and the smart socket when receiving the low-level control signal, and the control module turns off the power supply loop when receiving the high-level control signal.

2. The circuit according to claim 1, wherein the temperature over-locked module forms a positive feedback loop with the control signal as a feedback signal, and the temperature over-locked module locks the high-level control signal when the control signal is high, the temperature over-locked module comprises a temperature driving unit and an output feedback unit, the output feedback unit is connected with the temperature driving unit and the control module respectively, and the temperature driving unit is further connected with a first power supply, the temperature driving unit outputs a driving voltage in response to the working temperature under the output voltage of the first power supply, the driving voltage is less than a preset reference voltage when the working temperature is less than the preset temperature, and the driving voltage is greater than the preset reference voltage when the working temperature is greater than the preset temperature, the output feedback unit outputs the low-level control signal when the driving voltage is less than the preset reference voltage, and the output feedback unit outputs the high-level control signal when the driving voltage is greater than the preset reference voltage, the output feedback unit further outputs the high-level control signal when the level of the control signal is greater than the preset reference voltage, the control module comprises a switch driving unit and a relay unit, the relay unit is connected with the input power supply and the switch driving unit respectively, and the switch driving unit is connected with the temperature over-locked module, the switch driving unit outputs a low-level switch signal when receiving the high-level control signal, and the switch driving unit outputs a high-level switch signal when receiving the low-level control signal, the relay unit turns on the power supply loop when receiving the high-level switch signal, and the relay unit turns off the power supply loop when receiving the low-level switch signal, the temperature driving unit comprises a thermistor RT1, a resistor R12 and a capacitor C8, a first end of the thermistor RT1 is connected with the first power supply, a second end of the thermistor RT1 is connected with a first end of the resistor R12, a first end of the capacitor C8 and a signal input end of the output feedback unit, a second end of the resistor R12 and a second end of the capacitor C8 are grounded, the output feedback unit comprises a comparator U2B, a resistor R10, a resistor R11, a resistor R13, a capacitor C7, a capacitor C9, a diode D2 and a diode D5. ​ ​ ​ ​ ​ 3. The circuit of claim 1, wherein, ​ ​ ​ ​ ​ ​ 4. The circuit of claim 3, wherein, ​ 5. The circuit of claim 1, wherein, ​ ​ ​ 6. The circuit of claim 3, wherein, ​ ​ 7. The circuit of claim 3, wherein, ​ The first end of the resistor R10 and the second power supply, the first end of the resistor R11 and the first end of the capacitor C7 are connected, the second end of the resistor R10 and the inverting input terminal of the comparator U2B, the first end of the resistor R13 and the first end of the capacitor C9 are connected, the second end of the resistor R11 and the output terminal of the comparator U2B, the anode of the diode D5 and the anode of the diode D2 are connected, the cathode of the diode D2 and the non-inverting input terminal of the comparator U2B and the output terminal of the temperature feedback unit are connected, the cathode of the diode D5 and the input terminal of the control module are connected, the second end of the capacitor C7, the second end of the capacitor C9 and the second end of the resistor R13 are grounded.

8. The circuit of claim 5, wherein, The switch driving unit includes a transistor Q1, a resistor R14, a resistor R15, a resistor R16, a resistor R17 and a capacitor C10, The base of the transistor Q1 and the first end of the resistor R17, the first end of the capacitor C10 and the first end of the resistor R15 are connected, the second end of the resistor R15 and the output terminal of the over-temperature locking module are connected, the first end of the resistor R14 and the first power supply are connected, the second end of the resistor R14 and the first end of the resistor R16, the collector of the transistor Q1 and the signal input terminal of the relay unit are connected, the emitter of the transistor Q1, the second end of the resistor R17, the second end of the capacitor C10 and the second end of the resistor R16 are grounded.

9. The circuit of claim 5, wherein, The relay unit includes a MOS tube Q2, a diode D3 and a relay RLY1, The drain of the MOS tube Q2 and the anode of the diode D3 and the first coil end of the relay RLY1 are connected, the gate of the MOS tube Q2 and the output terminal of the switch driving unit are connected, the source of the MOS tube Q2 is grounded; The cathode of the diode D3 and the second coil end of the relay RLY1 and the second power supply are connected, the first connection end of the relay RLY1 and the input power supply are connected, the second connection end of the relay RLY1 and the output fire end of the intelligent socket are connected.

10. A smart socket, characterized in that, It comprises: The over-temperature protection circuit applied to the intelligent socket according to any one of claims 1-9. The over-temperature protection circuit applied to the intelligent socket according to any one of claims 1-9.

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