Extension socket device and leakage protection method

Abstract

The invention discloses an extension socket device and a leakage protection method. The extension socket device comprises at least one protection circuit for leakage current and at least one extension socket power supply port, and each protection circuit is connected with a connection circuit between the corresponding extension socket power supply port and a power supply and used for disconnecting the corresponding connection circuit when the corresponding connection circuit generates leakage current. The protection circuits corresponding to the extension socket power supply ports are arranged, and each protection circuit protects the corresponding extension socket power supply port, so that each extension socket power supply port on the extension socket device is independently controlled, and when a connection circuit of a certain extension socket power supply port and a power supply is disconnected, the power supply functions of other extension socket power supply ports on the extension socket device are not influenced; and the practicability of the extension socket device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage protection, in particular to a power strip device and a leakage protection method. BACKGROUND

[0002] At present, there are more and more consumer power strips / wall plugs / conversion plugs, including weak electric devices such as USB charging devices and USB line interfaces, which are safe for people (human body safety low voltage 36V), and strong electric devices such as hair dryers, microwave ovens, power tools, etc. There are leakage safety risks for high-power electrical devices. When the electrical device is in normal operation, due to poor insulation performance, damage to the insulation between the shell and the electrical element of the electrical device, etc., leakage current flowing through an abnormal path is easily generated, which can cause electric shock danger to the human body.

[0003] In order to prevent leakage current, a leakage protector or a leakage circuit breaker can be used, which can automatically cut off the circuit generating leakage current when detecting leakage current, thereby protecting the safety of the human body and the normal operation of the device. However, the leakage protector or the leakage circuit breaker needs to exist in a place that cannot be contacted with the wall, the power transformation box, etc., and therefore has problems such as high maintenance cost and difficult operation. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a power strip device. The power strip device comprises at least one leakage current protection circuit and at least one power strip power supply port, each of the protection circuits is connected with a connection circuit between a power supply and a corresponding power strip power supply port, and is used to disconnect the corresponding connection circuit when the corresponding connection circuit generates leakage current, wherein the protection circuit comprises a sampling circuit, a control module and a switch circuit,

[0005] One end of the sampling circuit is connected with the connection circuit, and the sampling circuit is used to sample the voltage of the connection circuit to obtain a sampling voltage;

[0006] The other end of the sampling circuit is connected with the control module, and the sampling circuit is further used to generate a first control signal based on the sampling voltage and transmit the first control signal to the control module;

[0007] The switch circuit is connected with the control module, and the switch circuit is coupled with a first switch of the connection circuit. The control module generates a second control signal based on the first control signal and transmits the second control signal to the switch circuit. In the case that the second control signal meets a first preset condition, the switch circuit controls the first switch to be disconnected based on the second control signal, so as to disconnect the connection circuit between the power supply and the power strip power supply port.

[0008] The switch circuit comprises a first resistor, a switch tube, a relay and a first diode, wherein

[0009] The first end of the switch tube is connected with the output end of the control module through the first resistor to receive the second control signal;

[0010] One end of the relay is connected with a first power supply, the other end of the relay is connected with the second end of the switch tube, and the relay is coupled with the first switch, and the first diode is connected with the relay in parallel;

[0011] The third end of the switch tube is grounded;

[0012] The control module transmits the second control signal to the switch tube to control the switch tube to be turned on or cut off, so as to change the voltage difference across the relay, and then the relay controls the first switch to be opened or closed.

[0013] The switch circuit further comprises a first capacitor and a first light emitting diode,

[0014] One end of the first capacitor is connected with the first end of the switch tube, and the other end of the first capacitor is connected with the third end of the switch tube;

[0015] The input end of the first light emitting diode is connected with the relay, and the output end of the first light emitting diode is connected with the second end of the switch tube;

[0016] When the switch tube is turned on, the first light emitting diode emits light, and the relay controls the first switch to be opened.

[0017] The sampling circuit comprises a sampling resistor, a second resistor, a third resistor, a signal converter, a second light emitting diode and a photoelectric triode, wherein

[0018] The first end of the sampling resistor is connected with the connection circuit, and the second end of the sampling resistor is grounded;

[0019] The first input end of the signal converter is connected with the first end of the sampling resistor through the second resistor, and the second input end of the signal converter is connected with the second end of the sampling resistor through the third resistor;

[0020] The input end of the second light emitting diode is connected with a second power supply, and the output end of the second light emitting diode is connected with the output end of the signal converter;

[0021] The photoelectric triode is coupled with the second light emitting diode, the input end of the photoelectric triode is connected with a third power supply, and the output end of the photoelectric triode is grounded;

[0022] The first input end of the control module is connected with the input end of the phototriode;

[0023] When the connection circuit is in the leakage state, the signal converter outputs a first level, the second light emitting diode emits light to make the phototriode conductive, the control module receives the first control signal output by the sampling circuit and generates the second control signal, and if the second control signal meets the first preset condition, the switch circuit controls the first switch to be turned off based on the second control signal.

[0024] When the connection circuit is in the normal state, the signal converter outputs a second level, the second light emitting diode does not emit light, the phototriode is cut off, the control module receives the first control signal output by the sampling circuit and generates the second control signal, and if the second control signal meets the second preset condition, the switch circuit controls the first switch to maintain the closed state.

[0025] The protection circuit further comprises a reset circuit, and the reset circuit comprises a fourth resistor, a second switch and a second capacitor.

[0026] The first end of the fourth resistor is connected with one end of the second capacitor, the second end of the fourth resistor is connected with a fourth power supply, and the other end of the second capacitor is grounded.

[0027] The second end of the fourth resistor is further grounded through a first lead wire and a second lead wire, one end of the second switch is connected with the first lead wire, and the other end of the second switch is connected with the second lead wire.

[0028] The second end of the fourth resistor is further connected with the second input end of the control module.

[0029] When the second switch is closed, the reset circuit transmits a third control signal to the control module, the control module transmits the second control signal to the switch circuit based on the third control signal, and the switch circuit controls the first switch to be closed based on the second control signal.

[0030] The outlet strip device further comprises at least one reset button, the reset button is arranged correspondingly with the second switch of the protection circuit, when the reset button is pressed, the second switch is closed, the reset circuit transmits a third control signal to the control module, the control module generates the second control signal based on the third control signal, and in the case that the second control signal meets the second preset condition, the switch circuit controls the first switch to be closed based on the second control signal, so as to restore the power supply of the corresponding power supply port of the outlet strip.

[0031] To solve the above technical problems, the application further provides a leakage protection method applied to the extension socket device as described above, and the method comprises the following steps:

[0032] receiving a first control signal transmitted by at least one sampling circuit; wherein each sampling circuit samples a corresponding connection circuit;

[0033] generating a corresponding second control signal based on each first control signal;

[0034] in response to the first control signal being a first level, the generated second control signal is a second level, and the second control signal is transmitted to a switch circuit to stop power supply to a corresponding extension socket power supply port;

[0035] or,

[0036] in response to the first control signal being the second level, the generated second control signal is the first level, and the second control signal is transmitted to the switch circuit to maintain the power supply to the corresponding extension socket power supply port.

[0037] wherein the step of receiving the first control signal transmitted by at least one sampling circuit, in response to the first control signal being a first level, the generated second control signal is a second level, comprises:

[0038] within a preset period, continuously receiving a plurality of first control signals transmitted by the same sampling circuit, and in response to a plurality of first control signals being the first level, the generated second control signal is the second level, and the second level is transmitted to the switch circuit.

[0039] wherein after the step of stopping the power supply to the corresponding extension socket power supply port, the method further comprises:

[0040] receiving the first control signal transmitted by the corresponding sampling circuit and receiving the third control signal transmitted by the corresponding reset circuit;

[0041] generating the second control signal based on the first control signal and the third control signal, in response to the first control signal being the second level and the third control signal being the first level, the generated second control signal is the first level; the first level is transmitted to the switch circuit to restore the power supply to the corresponding extension socket power supply port.

[0042] The method further comprises, in response to the first control signal being the first level or in response to the third control signal being the second level, the generated second control signal being the second level, and transmitting the second level to the switching circuit to maintain the stop power supply state of the corresponding power outlet.

[0043] The application has the following advantages: Different from the prior art, the power strip device of the application comprises at least one leakage current protection circuit and at least one power outlet, each protection circuit is connected with the connection circuit between the corresponding power outlet and the power supply, and is used to disconnect the corresponding connection circuit when leakage current occurs in the corresponding connection circuit. By arranging the protection circuit corresponding to the power outlet, each protection circuit protects the corresponding power outlet, and independent control of each power outlet on the power strip device is realized. When the connection circuit between a certain power outlet and the power supply is disconnected, the power supply function of the remaining power outlets on the power strip device is not affected, and the practicability of the power strip device is improved.

[0044] The protection circuit comprises a sampling circuit, a control module and a switching circuit. One end of the sampling circuit is connected with the connection circuit, and is used to sample the current flowing through the connection circuit to obtain a sampling voltage. The other end of the sampling circuit is connected with the control module, and is used to transmit a first control signal to the control module based on the sampling voltage. The switching circuit is connected with the control module, and the switching circuit is coupled with a first switch of the connection circuit. The control module generates a second control signal based on the first control signal, and transmits the second control signal to the switching circuit. In the case that the second control signal meets a first preset condition, the switching circuit controls the first switch to be disconnected based on the second control signal, so as to disconnect the connection circuit between the power supply and the power outlet when leakage current occurs. The sampling circuit samples the voltage in the connection circuit, and detects the voltage on the connection circuit in real time, while transmitting the first control signal to the control module. When leakage current occurs in the connection circuit, the control module can generate a corresponding second control signal to control the switching circuit to disconnect the connection circuit, improve the reaction efficiency of the power strip device to leakage current, and the protection circuit does not need to be arranged in a place that cannot be touched, thereby reducing the maintenance difficulty of the protection circuit and improving the user experience of the power strip device. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0046] Wherein:

[0047] Figure 1Fig. 1 is a structural schematic diagram of a first embodiment of a protection circuit of the present application;

[0048] Figure 2 Fig. 2 is a structural schematic diagram of a first embodiment of a switch circuit of the present application;

[0049] Figure 3 Fig. 3 is a structural schematic diagram of a first embodiment of a sampling circuit of the present application;

[0050] Figure 4 Fig. 4 is a structural schematic diagram of a first embodiment of a reset circuit of the present application;

[0051] Figure 5 Fig. 5 is a structural schematic diagram of a second embodiment of a protection circuit of the present application;

[0052] Figure 6 Fig. 6 is a flow schematic diagram of a first embodiment of a method for leakage protection of the present application;

[0053] Figure 7 Fig. 7 is a flow schematic diagram of a second embodiment of a method for leakage protection of the present application;

[0054] Figure 8 Fig. 8 is a flow schematic diagram of a third embodiment of a method for leakage protection of the present application.

[0055] Fig. 9 is a schematic diagram of a protection circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0056] The schemes of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0057] In the following description, for the purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, interfaces, techniques, etc., in order to provide a thorough understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details.

[0058] Reference in the specification to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" or "in the embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0059] The term "and / or", in this application, is only used to describe the relationship of the associated objects, which means that there are three kinds of relationships, for example, A and / or B, which means that there are three cases, A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally means that the front and rear associated objects have an "or" relationship. In addition, "multiple" in this application means two or more. In addition, the terms "first", "second", "third" in this application are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0060] The application first provides a power strip device, which comprises at least one leakage current protection circuit and at least one power supply port of the power strip. The protection circuit can be connected with the connection circuit between the corresponding power supply port and the power supply, so that when the protection circuit detects that the corresponding connection circuit generates leakage current, the protection circuit disconnects the corresponding connection circuit to disconnect the power supply of the corresponding power supply port, thereby avoiding the influence of leakage current on the electrical equipment inserted in the power supply port of the power strip and causing damage to the user.

[0061] Specifically, the power strip device comprises at least one power supply port of the power strip to supply power to at least one electrical equipment at the same time. The protection circuit is connected with the connection circuit between each power supply port of the power strip and the power supply, that is, each protection circuit monitors the safety of the corresponding power supply port. When any protection circuit in the at least one protection circuit detects that the corresponding connection circuit leaks, that is, the electrical equipment inserted in the corresponding power supply port of the power strip will be affected by the leakage current, the protection circuit disconnects the corresponding connection circuit to disconnect the power supply of the corresponding power supply port, thereby avoiding the damage of the leakage current to the electrical equipment inserted in the power supply port of the power strip and improving the safety of the power strip device.

[0062] At the same time, since each power supply port of the power strip has a corresponding protection circuit, that is, when a certain protection circuit disconnects the power supply of the corresponding power supply port, it does not affect the power supply of the remaining power supply ports of the power strip. The remaining power supply ports of the power strip on the power strip can still continue to supply power, thereby improving the practicability of the power strip device.

[0063] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of the first embodiment of the protection circuit of the application. The leakage current protection circuit 1 provided by the embodiment of the application is connected with the connection circuit between the power supply 2 and the power supply port 3 of the power strip, which is used to disconnect the connection between the power supply 2 and the power supply port 3 of the power strip when the connection circuit generates leakage current, so as to protect the power supply port 3 of the power strip.

[0064] The protection circuit 1 comprises a sampling circuit 11, a control module 12 and a switch circuit 13. Hereinafter, one protection circuit and the corresponding power supply port 3 of the extension socket are taken as an example.

[0065] Specifically, one end of the sampling circuit 11 is connected with the connection circuit, for sampling the voltage of the connection circuit to obtain a sampling voltage. The other end of the sampling circuit 11 is connected with the control module 12. The sampling circuit 11 is also used to generate a first control signal based on the sampling voltage and transmit the first control signal to the control module 12. In an embodiment, the first control signal can be a high-low level signal. For example, when the first control signal is a high level signal, it indicates that the sampling circuit 11 samples the connection circuit, and judges that the connection circuit is in a normal state at this time. When the first control signal is a low level signal, it indicates that the sampling circuit 11 samples the connection circuit, and the connection circuit is in a leakage state at this time. Then the sampling circuit 11 transmits the low level signal to the control module 12. The control module 12 obtains the information that the connection circuit generates a leakage current, and controls the switch circuit 13 to take protective measures.

[0066] Further, the switch circuit 13 is connected with the control module 12, and the switch circuit 13 is coupled with the first switch S1 of the connection circuit. The control module 12 generates a second control signal based on the first control signal and transmits the second control signal to the switch circuit 13. The switch circuit controls the first switch S1 to be disconnected based on the second control signal, so as to disconnect the connection circuit between the power supply 2 and the extension socket power supply port 3, stop the power supply of the extension socket power supply port 3, and avoid damage to the electrical equipment plugged into the extension socket power supply port 3.

[0067] Specifically, when the control module 12 receives the low level signal transmitted by the sampling circuit 11, the control module 12 judges that the connection circuit is in a leakage state at this time. Then the control module 12 generates a corresponding second control signal and transmits it to the switch circuit 13. The second control signal can be a high-low level signal. For example, when the control module 12 receives the low level signal transmitted by the sampling circuit 11, it generates a high level signal and transmits it to the switch circuit 13. When the switch circuit 13 receives the high level signal (i.e., the first preset condition is that the second control signal is high at this time), the first switch S1 is controlled to be disconnected, so as to disconnect the connection between the power supply 2 and the extension socket power supply port 3, realize the protection of the electrical equipment plugged into the extension socket power supply port 3, and at the same time avoid the risk of electric shock of the user using the extension socket power supply port 3 under the condition that the connection circuit is in a leakage state, and improve the safety of the user using the extension socket device.

[0068] In summary, by setting the protection circuit 1 on the connection circuit of the power supply 2 and the power supply port 3 of the extension socket, the sampling circuit 11 of the protection circuit 1 samples the voltage on the connection circuit, realizes real-time detection of the voltage on the connection circuit by the sampling circuit 11, can respond in time in the state that the leakage current is generated on the connection circuit, transmits the signal to the control module 12, and then the control module 12 transmits the signal to the switching circuit 13, the switching circuit 13 disconnects the connection between the power supply 2 and the power supply port 3 of the extension socket, and at the same time can avoid the danger that the user is electrocuted by using the power supply port 3 of the extension socket, and improve the safety of the user using the extension socket device.

[0069] At the same time, the user does not need to additionally set the leakage protector or leakage circuit breaker which is difficult to maintain, only needs to set the protection circuit 1 on the connection circuit of the power supply 2 and the power supply port 3 of the extension socket, improves the convenience and practicality of the protection circuit 1, and further improves the user experience of the extension socket device.

[0070] In an embodiment, the connection of the sampling circuit 11 and the control module 12 and the connection of the control module 12 and the switching circuit 13 can be wired connection, for example, the sampling circuit 11 and the control module 12 are connected by using wires, and the control module 12 and the switching circuit 13 are connected by using wires.

[0071] In another embodiment, the connection of the sampling circuit 11 and the control module 12 and the connection of the control module 12 and the switching circuit 13 can also be wireless connection, for example, the transmission of the first control signal between the sampling circuit 11 and the control module 12 and the transmission of the second control signal between the control module 12 and the switching circuit 13 are realized by using Uart (Universal Asynchronous Receiver / Transmitter, universal asynchronous receiver / transmitter) communication and IOT (Internet of Things, Internet of Things) module communication. The specific connection form of the sampling circuit 11 and the control module 12 and the specific connection form of the control module 12 and the switching circuit 13 are not limited in the present application.

[0072] Further, when the control module 12 receives the first control signal transmitted by the sampling circuit 11, the control module 12 generates the second control signal according to the first control signal, and transmits the second control signal to the switching circuit 13 to control the switching circuit 13 to disconnect the connection circuit, at the same time, the control module 12 can also notify the host terminal display device of the fault signal of the connection circuit through the Bluetooth or Wifi of the IOT, for example, transmit the fault signal to the user's mobile phone, etc., to inform the user that the connection circuit leaks, the protection circuit 1 has disconnected the connection circuit, avoids the situation that the user mistakenly thinks that the power equipment generates a fault when the power equipment inserted in the power supply port 3 of the extension socket stops power supply and shuts down.

[0073] Optionally, refer to Figure 2 , Figure 2 is the structural schematic diagram of the first embodiment of the switch circuit of the present application. The switch circuit 13 comprises a first resistor R1, a switch tube Q1, a relay J1 and a first diode D1.

[0074] The first end of the switch tube Q1 is connected with the output end of the control module 12 through the first resistor R1 to receive the second control signal. One end of the relay J1 is connected with the first power supply VCC1, the other end of the relay J1 is connected with the second end of the switch tube Q1, and the relay J1 is coupled with the first switch S1 to control the state of the first switch S1. The first diode D1 is connected in parallel with the relay J1, and the third end of the switch tube Q1 is grounded.

[0075] The control module 12 transmits the second control signal to the switch tube Q1 to control the switch tube Q1 to be conductive or cut off, so as to change the voltage difference between the two ends of the relay J1, and then the relay J1 controls the first switch S1 to be disconnected or closed.

[0076] The relay is a kind of electric control equipment, which is an automatic switching element that makes the controlled quantity (output quantity) produce predetermined changes through electromagnetic effect or other physical effect according to the change of input quantity (excitation quantity) in the circuit, mainly used for electrical isolation, automation control and protection circuit, etc. When the coil of the relay is energized, a magnetic field is generated, which drives the contact to act by attracting the iron core, thereby changing the on-off state of the first switch S1.

[0077] Specifically, when the connection circuit is in a normal state, the first switch S1 is in a closed state, the first control signal transmitted by the sampling circuit 11 to the control module 12 is a high-level signal, the control module 12 generates the second control signal based on the first control signal and transmits it to the switch circuit 13, at this time the second control signal is a low-level signal, the switch tube Q1 receives the low-level signal, and due to the low voltage, the switch tube Q1 cannot be conductive and is in a cut-off state, at this time the voltage difference between the two ends of the relay J1 is 0, the first switch S1 remains in a closed state, and the connection circuit between the power supply 2 and the power supply port 3 of the extension socket is connected.

[0078] When the connection circuit is in the leakage state, the first control signal transmitted by the sampling circuit 11 to the control module 12 is a low-level signal, the control module 12 generates a second control signal based on the first control signal and transmits it to the switching circuit 13, at this time the second control signal is a high-level signal, after the switching tube Q1 receives the high-level signal, the switching tube Q1 reaches the conduction condition, the switching tube Q1 is turned on, and since the third end of the switching tube Q1 is grounded, the potential of the relay J1 close to one end of the switching tube Q1 is pulled low, that is, the voltage difference between the two ends of the relay J1 becomes large, the relay J1 operates, and the first switch S1 changes from the closed state to the open state to disconnect the connection circuit between the power supply 2 and the outlet power supply port 3.

[0079] It can be understood that when the leakage state of the connection circuit is removed and the connection circuit returns to normal, the control module 12 can transmit a low-level signal to the switching circuit 13, and the switching tube Q1 is cut off, and then the voltage between the two ends of the relay J1 is equal, and the first switch S1 cannot be controlled, and the first switch S1 returns to the closed state, that is, the connection circuit between the power supply 2 and the outlet power supply port 3 is restored, and the outlet power supply port 3 resumes power supply.

[0080] Through the cooperation of the control module 12, the switching tube Q1 and the relay J1, the first switch S1 is disconnected or closed, the circuit structure is simple, the difficulty of maintenance of the protection circuit 1 by the user is reduced, and the user's experience of using the outlet device is improved.

[0081] Optionally, the switching circuit 13 further comprises a first capacitor C1 and a first light-emitting diode LED1.

[0082] One end of the first capacitor C1 is connected with the first end of the switching tube Q1, and the other end of the first capacitor C1 is connected with the third end of the switching tube Q1, and then the first capacitor C1 filters the voltage signal received by the switching tube Q1, avoids the switching tube Q1 misjudging the second control signal and disconnecting or closing the first switch S1, and makes the connection circuit in the leakage state operate or the connection circuit in the normal state disconnected, thereby improving the accuracy of the switching circuit 13.

[0083] The input end of the first light-emitting diode LED1 is connected with the relay J1, and the output end of the first light-emitting diode LED1 is connected with the second end of the switching tube Q1, and then when the switching tube Q1 is turned on, the current of the first power supply VCC1 passes through the relay J1, the first light-emitting diode LED1 and the switching tube Q1 to the ground, the first light-emitting diode LED1 emits light, and the relay J1 controls the first switch S1 to be disconnected, so that the user can directly judge the problem of the connection circuit according to the light emission of the first light-emitting diode LED1, and maintain the connection circuit, thereby improving the practicability of the protection circuit 1.

[0084] In an embodiment, the switch circuit 13 can further comprise a fifth resistor R5, and the output of the control module 12 is connected to the first end of the switch tube Ql through the first resistor Rl to protect the circuit between the control module 12 and the switch tube Ql. The fifth resistor R5 is arranged between the input of the first light emitting diode LEDl and the relay Jl, and can reduce the current supplied by the first power supply VCCl to the first light emitting diode LEDl when the switch tube Ql is turned on, thereby protecting the first light emitting diode LEDl.

[0085] Optionally, referring to Figure 3 , Figure 3 is a structural schematic diagram of the first embodiment of the sampling circuit of the present application. The sampling circuit 11 comprises a sampling resistor R, a second resistor R2, a third resistor R3, a signal converter U1, a second light emitting diode LED2 and a photoelectric triode VTl.

[0086] The first end of the sampling resistor R is connected to the connection circuit, and the second end of the sampling resistor R is grounded. In actual application, the strong current equipment is generally directly connected to the LN line (zero line ACN and fire line ACL) and the ground line, thus the first end of the sampling resistor R can be connected to the ACN and the ACL, and the second end of the sampling resistor R is connected to the PE (ground line).

[0087] The first input end V1N of the signal converter U1 is connected to the first end of the sampling resistor R through the second resistor, the second input end V1P of the signal converter U1 is connected to the second end of the sampling resistor R through the third resistor R3. The input end of the second light emitting diode LED2 is connected to the second power supply VCC2, and the output end of the second light emitting diode LED2 is connected to the output end of the signal converter U1. The photoelectric triode VTl is coupled to the second light emitting diode LED2, the input end of the photoelectric triode VTl is connected to the third power supply VCC3, and the output end of the photoelectric triode VTl is grounded. The first input end of the control module 12 is connected to the input end of the photoelectric triode VTl.

[0088] Specifically, when the connection circuit is in the leakage state, the leakage current flows through the abnormal path, that is, the voltage difference between the first end and the second end of the sampling resistor R drops sharply or becomes negative, at this time, the voltage difference between the first input end V1N and the second input end V1P of the signal converter U1 is negative or tends to be 0, the signal converter U1 outputs the first level, wherein the first level can be a low level signal, the input voltage (the second power supply VCC2) of the second light emitting diode LED2 is higher than the output voltage (the low level signal output by the signal converter U1) of the second light emitting diode LED2, thus the second power supply VCC2 supplies power to the second light emitting diode LED2, and the second light emitting diode LED2 emits light.

[0089] The photoelectric triode VT1 can be a photosensitive triode. When the second light emitting diode LED2 emits light, the photoelectric triode VT1 is turned on, and the current flowing direction of the third power supply VCC3 is to provide the photoelectric triode VT1 flowing to the ground. The first control signal received by the control module 12 is a low-level signal. At this time, the second control signal generated by the control module 12 based on the low-level signal is a high-level signal. The second control signal meets the first preset condition. Therefore, after the second control signal is received by the switching circuit 13, the first switch S1 is controlled to be turned off based on the second control signal, so as to disconnect the connection between the power supply 2 and the power supply port 3 of the extension socket.

[0090] When the connection circuit is in a normal state, there is a positive voltage difference between the first end and the second end of the sampling resistor R. At this time, the signal converter U1 outputs a second level, which can be a high-level signal. The input voltage (the second power supply VCC2) of the second light emitting diode LED2 is lower than the output voltage (the high-level signal output by the signal converter U1) of the second light emitting diode LED2. The second power supply VCC cannot supply power to the second light emitting diode LED2, and the second light emitting diode LED2 does not emit light. The photoelectric triode VT1 is cut off, and the third power supply VCC3 provides voltage for the control module 12, that is, the first control signal received by the control module 12 is a high-level signal. At this time, the second control signal generated by the control module 12 based on the high-level signal is a low-level signal. The second control signal meets the second preset condition. Therefore, after the second control signal is received by the switching circuit 13, the first switch S1 is not actuated, and the first switch S1 maintains the closed state.

[0091] The sampling resistor R samples the connection circuit, and the signal converter U1 converts the sampling voltage into a high-low level signal. Then, the first control signal is transmitted to the control module 12 through the second light emitting diode LED2 and the photoelectric triode VT1. The sampling circuit 11 detects the connection circuit in real time, improves the response rate of the sampling circuit 11 to the leakage current of the connection circuit, and improves the practicability of the protection circuit 1.

[0092] Optionally, please refer to Figure 1 and Figure 4 , Figure 4 is a structural schematic diagram of the first embodiment of the reset circuit. The reset circuit 14 includes a fourth resistor R4, a second switch S2, and a second capacitor C2.

[0093] The first end of the fourth resistor R4 is connected with one end of the second capacitor C2, the second end of the fourth resistor R4 is connected with the fourth power supply VCC4, and the other end of the second capacitor C2 is grounded. The second end of the fourth resistor R4 is also grounded through the first lead wire and the second lead wire, one end of the second switch S2 is connected with the first lead wire, and the other end of the second switch S2 is connected with the second lead wire. The second end of the fourth resistor R4 is also connected with the second input end of the control module 12.

[0094] Specifically, when the connection circuit is in normal operation or the connection circuit is disconnected, the second switch S2 is in an open state, at this time, the fourth power supply VCC4 provides a voltage for the second input end of the control module 12, and the third control signal received by the control module 12 is a high-level signal.

[0095] When the user needs to reconnect the connection circuit between the power supply 2 and the power supply port 3 of the extension socket after maintenance, the user can operate the reset circuit 14, turn off the second switch S2, and then the current of the fourth power supply VCC4 flows to the ground, at this time, the third control signal received by the control module 12 is a low-level signal. Then the control module 12 can transmit the low-level signal to the switch circuit 13, and the switch circuit 13 reconnects the connection circuit.

[0096] Please continue to refer to Figure 4 , the first lead wire and the second lead wire are connected with the second capacitor C2 in parallel, so that when the second switch S2 is closed, the part of the circuit is in a short-circuit state, the current of the fourth power supply VCC4 flows to the ground, and the third control signal output by the reset circuit 14 is a low-level signal. If the circuit is in a short-circuit state for a long time, it will cause damage to the circuit and affect the stability of the protection circuit 1. Therefore, in an embodiment, a triggering device can be added at the second switch S2, when the user closes the second switch S2, the triggering device can immediately disconnect the second switch S2, at this time, the third control signal received by the control module 12 is a momentary falling edge signal, and then returns to a high-level signal. When the control module 12 receives the third control signal with a momentary falling edge signal, it can be judged that the user operates the reset circuit 14 and needs to reconnect the connection circuit.

[0097] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of the second embodiment of the protection circuit of the present application. The following is a brief description of the working process of the protection circuit 1:

[0098] The sampling circuit 11, the reset circuit 14 and the switch circuit 13 are connected with the control module 12 respectively. When the connection circuit is in the leakage state, the sampling circuit 11 transmits the first control signal to the control module 12, and the first control signal is a low-level signal at this time. Then the control module 12 transmits the second control signal to the switch circuit 13, and the second control signal is a high-level signal at this time. After receiving the high-level signal, the switch circuit 13 controls the switch tube Q1 to be turned on, and the relay J1 disconnects the first switch S1 to disconnect the connection circuit, thereby realizing the protection of the power supply port 3 of the extension socket.

[0099] When the user completes the maintenance of the connection circuit, the user closes the second switch S2 of the reset circuit 14, and then the reset circuit 14 transmits the third control signal to the control module 12 to generate a transient falling edge signal. The control module 12 further transmits the second control signal to the switch circuit 13, and the second control signal is a low-level signal at this time. After receiving the low-level signal, the switch circuit 13 controls the switch tube Q1 to be cut off, the relay J1 stops running, the first switch S1 returns to the closed state, and the connection circuit returns to the connected state.

[0100] In an embodiment, when the user completes the maintenance of the connection circuit, the user closes the second switch S2 of the reset circuit 14, and then the reset circuit 14 transmits the third control signal to the control module 12 to generate a transient falling edge signal. At the same time, the control module 12 continues to receive the first control signal transmitted by the sampling circuit 11. When it is judged that the first control signal is a high-level signal (the connection circuit is in a normal state), the control module 12 transmits a low-level signal to the switch circuit 13, thereby avoiding the connection circuit being connected when it is not completely maintained, causing damage to the power supply port 3 of the extension socket and improving the practicability of the protection circuit 1.

[0101] Optionally, the extension socket device can include at least one reset button corresponding to the second switch S2 of the protection circuit 1. The user presses the reset button to close the second switch S2, and the reset circuit 14 generates the third control signal. As described above, the third control signal is a falling edge signal at this time, and the third control signal is transmitted to the control module 12. The control module 12 generates the second control signal based on the third control signal, and the second control signal can be a low-level signal at this time, thereby satisfying the second preset condition. Therefore, the switch circuit 13 controls the first switch S1 to be closed based on the second control signal, so as to restore the power supply of the corresponding power supply port 3 of the extension socket.

[0102] As described above, when the power supply of a power supply port 3 of the extension socket is stopped due to leakage, the user needs to restore the power supply of the power supply port 3. When the connection circuit between the power supply port 3 and the power supply 2 returns to normal, the control module 12 can control the power supply port 3 to restore the power supply, so as to supply power to the electrical equipment plugged into the power supply port 3.

[0103] In conclusion, the power strip device provided by the embodiments of the present application comprises at least one protection circuit 1 and at least one power supply port 3 of the power strip, each protection circuit 1 is connected to the connection circuit between the corresponding power supply port 3 of the power strip and the power supply 2, and is used to disconnect the corresponding connection circuit when a leakage current is generated in the corresponding connection circuit. By arranging the protection circuit 1 corresponding to the power supply port 3 of the power strip, each protection circuit 1 protects the corresponding power supply port 3 of the power strip, thereby realizing independent control of each power supply port 3 of the power strip device. When the connection circuit between a certain power supply port 3 of the power strip and the power supply 2 is disconnected, the power supply function of the remaining power supply ports 3 of the power strip device is not affected, thereby improving the practicability of the power strip device.

[0104] Further, the protection circuit 1 comprises a sampling circuit 11, a control module 12, a switching circuit 13 and a reset circuit 14. The sampling circuit 11 of the protection circuit 1 samples the voltage on the connection circuit, thereby realizing real-time detection of the voltage on the connection circuit by the sampling circuit 11. In the state that a leakage current is generated in the connection circuit, the sampling circuit 11 can respond in time and transmit a signal to the control module 12. Then, the control module 12 transmits the signal to the switching circuit 13, and the switching circuit 13 disconnects the connection between the power supply 2 and the power supply port 3 of the power strip, thereby realizing protection of the electrical equipment plugged into the power supply port 3 of the power strip. At the same time, the danger of electric shock of the user using the power supply port 3 of the power strip with leakage can be avoided, thereby improving the safety of the power strip device. After the user completes the maintenance of the connection circuit, the user can operate the reset circuit 14, and then the control module 12 controls the switching circuit 13 to connect the connection circuit, thereby restoring the power supply of the power supply 2 to the power supply port 3 of the power strip, and improving the convenience of the protection circuit 1.

[0105] In other embodiments, the power strip device can only comprise one protection circuit 1, and the protection circuit 1 comprises one control module 12, at least one sampling circuit 11, at least one switching circuit 13 and at least one reset circuit 14. The at least one sampling circuit 11, the at least one switching circuit 13 and the at least one reset circuit 14 are arranged corresponding to the at least one power supply port 3 of the power strip, and each power supply port 3 of the power strip device is monitored.

[0106] Specifically, each sampling circuit 11 samples the corresponding power supply port 3 of the power strip, and then transmits a first control signal to the control module 12. The control module 12 generates a second control signal based on the first control signal and transmits the second control signal to the corresponding switching circuit 13. The switching circuit 13 disconnects the power supply of the power supply port 3 of the power strip. Since each power supply port 3 of the power strip has a corresponding sampling circuit 11 and switching circuit 13, that is, when one or more power supply ports 3 of the power strip device are disconnected from the power supply, the power supply of the other power supply ports 3 is not affected, and each power supply port 3 of the power strip is independent.

[0107] Further, after the maintenance is completed, the user can press the reset button corresponding to the row of plug power supply port 3, and the second switch S2 in the corresponding reset circuit 14 is closed, the third control signal received by the control module 12 appears a falling edge signal, and the control module 12 controls to restore the power supply of the row of plug power supply port 3.

[0108] In other embodiments, the protection circuit 1 can also include a plurality of control modules 12, each control module 12 corresponding to each row of plug power supply port 3, so as to improve the response speed of the control module 12 to the first control signal transmitted by each sampling circuit 11, reduce the processing amount of the control module 12 to the control signal, and improve the processing efficiency of the protection circuit 1.

[0109] The application further provides a method for leakage protection of the row plug device, which is described above. Please refer to Figure 6 , Figure 6 is a flowchart of the first embodiment of the leakage protection method of the application. The method provided in the embodiment specifically includes:

[0110] S1: receiving the first control signal transmitted by at least one sampling circuit 11.

[0111] As described above, the row plug device includes at least one sampling circuit 11, each sampling circuit 11 corresponding to a connection circuit for sampling, and the control module 12 receives the first control signal transmitted by at least one sampling circuit 11 to determine whether each connection circuit is in a normal state or a leakage state.

[0112] S2: determining whether the first control signal is a first level.

[0113] The first level can be a low level. When the first control signal transmitted by the sampling circuit 11 is a low level signal, it indicates that the connection circuit is in a leakage state, and the control module 12 needs to control the switch circuit 13 to disconnect the connection circuit. When the first control signal transmitted by the sampling circuit 11 is a high level signal, it indicates that the connection circuit is in a normal state, and the switch circuit 13 does not need to disconnect the connection circuit. Therefore, when the first control signal received by the control module 12 is the first level, step S3 is entered; when the first control signal received by the control module 12 is the second level, step S4 is entered.

[0114] S3: in response to the first control signal being the first level, the second control signal generated is the second level, and the second control signal is transmitted to the switch circuit 13 to stop the power supply of the corresponding row of plug power supply port 3.

[0115] When the first control signal is the first level, i.e. there is a leakage current in the connection circuit, the control module 12 generates the second control signal as the second level based on the first control signal, wherein the second level can be a high level. As described above, when the switch circuit 13 receives the high level signal, the switch tube Q1 is turned on, the relay J1 disconnects the first switch S1 to disconnect the connection circuit between the power supply 2 and the outlet 3, i.e. the protection circuit 1 disconnects the connection circuit between the power supply and the outlet 3, and the outlet 3 on the power strip stops supplying power to the electrical equipment plugged into the outlet 3.

[0116] S4: In response to the first control signal being the second level, the generated second control signal is the first level, and the second control signal is transmitted to the switch circuit 13 to maintain the power supply of the corresponding outlet 3.

[0117] When the first control signal is not the first level, i.e. the first control signal is the second level, at this time the connection circuit is in a normal state, the control module 12 generates the second control signal as the first level based on the first control signal, i.e. a low level. As described above, when the switch circuit 13 receives the low level signal, the switch tube Q1 is cut off, the relay J1 does not act on the first switch S1, and the first switch S1 remains closed to maintain the connection circuit between the power supply 2 and the outlet 3, and to maintain the power supply of the corresponding outlet 3.

[0118] That is, when the protection circuit 1 on the power strip detects a leakage current in the connection circuit between the corresponding outlet 3 and the power supply 2, the protection circuit 1 disconnects the power supply of the corresponding outlet 3 without affecting the power supply of the remaining outlets 3 on the power strip. In the case of excluding the outlet 3 on the power strip that has a risk of leakage, the normal use of the outlet 3 on the power strip is not affected, and the practicability of the power strip is improved.

[0119] Please continue to refer to Figure 7 , Figure 7 is a flowchart of the second embodiment of the method for leakage protection. In an embodiment, voltage fluctuations in the connection circuit can cause the connection circuit to be in a normal state, and the first control signal output by the sampling circuit 11 to be the first level. Therefore, the specific steps of the control module 12 receiving the first control signal transmitted by the sampling circuit 11 and generating the second control signal in response to the first control signal being the first level include:

[0120] S11: Continuously receive multiple first control signals transmitted by the same sampling circuit 11 within a preset period.

[0121] In order to avoid the misjudgment of the protection circuit 1 caused by the voltage fluctuation in the connection circuit, the control module 12 can continuously receive a plurality of first control signals transmitted by the same sampling circuit 11 in a preset period. For example, the control module 12 can continuously receive the first control signals transmitted by the same sampling circuit 11 for three periods. If the plurality of first control signals transmitted by the sampling circuit 11 in the preset period are all the same level, the error caused by the fluctuation of the connection circuit can be excluded.

[0122] S12: determining whether the plurality of first control signals are all the first level.

[0123] After receiving the plurality of first control signals, the control module 12 further determines whether the plurality of first control signals are all the first level. If the plurality of first control signals are all the first level, it indicates that the connection circuit is in the leakage state. It can be understood that, since the control module 12 receives the first control signal in real time, the control module 12 determines the first control signal immediately after receiving the first control signal. If the first control signal received by the control module 12 in the preset period is all the first level, the control module 12 determines that the connection circuit is in the leakage state, and the second control signal generated by the control module 12 based on the first control signal is the second level.

[0124] S13: transmitting the second level to the switch circuit 13.

[0125] In response to the plurality of first control signals being all the first level, the control module 12 confirms that the connection circuit is in the leakage state, generates the second control signal of the second level, and transmits the second level to the switch circuit 13. The switch circuit 13 disconnects the connection circuit.

[0126] Further, please refer to Figure 8 , Figure 8 is a structural schematic diagram of the third embodiment of the method for leakage protection. After the control module 12 disconnects the connection circuit and the user completes the maintenance of the connection circuit, the method provided by the application further includes the following specific steps:

[0127] S41: receiving the first control signal transmitted by the sampling circuit 11 and receiving the third control signal transmitted by the reset circuit 14.

[0128] As described above, when the user operates the reset circuit 14, there may be a case that the connection circuit is not completely maintained. Therefore, the control module 12 needs to receive the first control signal transmitted by the sampling circuit 11 and the third control signal transmitted by the reset circuit 14. Only when the connection circuit is completely maintained, the connection circuit is in the normal state, and the user needs to connect the connection circuit, the control module 12 controls the switch circuit 13 to reconnect the connection circuit.

[0129] S42: judging whether the first control signal is the second level and the third control signal is the first level.

[0130] When the first control signal is the second level, that is, the high level signal, it indicates that the connection circuit is in the normal state, and the user has completed the maintenance of the connection circuit. When the first control signal is the first level, that is, the low level signal, it indicates that the connection circuit is still in the leakage state, and it is very dangerous to connect the connection circuit at this time. When the third control signal is the first level, it is actually a falling edge signal as described above. When the third control signal appears the falling edge signal, it indicates that the user operates the reset circuit 14, and the user needs to connect the connection circuit.

[0131] When the first control signal is the second level and the third control signal is the first level, it indicates that the connection circuit is in the normal state, and the user needs to connect the connection circuit. At this time, the control module 12 can control the switch circuit 13 to reconnect the connection circuit, and enter step S43.

[0132] When the first control signal is the first level, or the third control signal is the second level, it indicates that the connection circuit is in the leakage state, or the user does not need to connect the connection circuit. The control module 12 can suspend the connection process of the connection circuit, and enter step S44.

[0133] S43: transmitting the first level to the switch circuit 13 to restore the power supply of the corresponding power outlet 3.

[0134] When the first control signal is the second level and the third control signal is the first level, the second control signal generated by the control module 12 is the first level. Then, the control module 12 can transmit the first level to the switch circuit 13 to control the switch circuit 13 to connect the connection circuit, that is, to restore the connection between the power outlet 3 and the power supply 2, and to restore the power supply of the power outlet 3 on the power strip device.

[0135] S44: transmitting the second level to the switch circuit 13 to maintain the stop power supply state of the corresponding power outlet 3.

[0136] When the first control signal is the first level, or the third control signal is the second level, the second control signal generated by the control module 12 is the second level. Then, the control module 12 transmits the second level to the switch circuit 13, and the switch circuit 13 maintains the disconnected state of the connection circuit between the power supply 2 and the power outlet 3 to maintain the stop power supply state of the power outlet 3 on the power strip device.

[0137] To sum up, the method for leakage protection provided by the application is applied to the extension socket device. In the method, the control module 12 only disconnects the connecting circuit when all the first control signals received by the control module 12 in the preset period are the first level, so as to avoid the possibility of misjudgment caused by voltage fluctuation in the connecting circuit and improve the accuracy of the control module 12 in judging the state of the connecting circuit. When the connecting circuit is disconnected and needs to be restored to the connected state, the control module 12 only connects the connecting circuit when the control module 12 receives the first control signal as the second level and the third control signal as the first level, so as to avoid connecting the connecting circuit when the connecting circuit is not repaired, which may cause danger; or the user does not need to connect the power supply port 3 of the extension socket for use, but connects the connecting circuit, which may cause the waste of energy, and improves the user experience of the method for leakage protection.

[0138] The above description is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields by using the content of the specification and drawings, is also included in the patent protection scope of the application.

Claims

1. A power strip device, characterized by, The protection circuit includes at least one leakage current and at least one power outlet, each of the protection circuit is connected between the power supply and the corresponding connection circuit of the power outlet, for disconnecting the corresponding connection circuit when the leakage current is generated in the corresponding connection circuit, wherein the protection circuit includes a sampling circuit, a control module and a switch circuit, One end of the sampling circuit is connected to the connection circuit for sampling the voltage of the connection circuit to obtain a sampling voltage; The other end of the sampling circuit is connected to the control module, and the sampling circuit is also used to generate a first control signal based on the sampling voltage and transmit the first control signal to the control module; The switch circuit is connected to the control module, and the switch circuit is coupled with a first switch of the connection circuit, the control module generates a second control signal based on the first control signal and transmits the second control signal to the switch circuit, and in the case that the second control signal meets a first preset condition, the switch circuit controls the first switch to be disconnected based on the second control signal to disconnect the connection circuit between the power supply and the power outlet.

2. The outlet strip device of claim 1, wherein, The switch circuit includes a first resistor, a switch tube, a relay and a first diode, wherein The first end of the switch tube is connected to the output end of the control module through the first resistor to receive the second control signal; One end of the relay is connected to a first power supply, the other end of the relay is connected to the second end of the switch tube, and the relay is coupled with the first switch, and the first diode is connected in parallel with the relay; The third end of the switch tube is grounded; The control module transmits the second control signal to the switch tube to control the switch tube to be turned on or cut off to change the voltage difference across the relay, and then the relay controls the first switch to be disconnected or closed.

3. The outlet strip device of claim 2, wherein, The switch circuit further includes a first capacitor and a first light emitting diode, One end of the first capacitor is connected to the first end of the switch tube, and the other end of the first capacitor is connected to the third end of the switch tube; The input end of the first light emitting diode is connected to the relay, and the output end of the first light emitting diode is connected to the second end of the switch tube; When the switch tube is turned on, the first light emitting diode emits light, and the relay controls the first switch to be disconnected.

4. The outlet strip device of claim 1, wherein, The sampling circuit includes a sampling resistor, a second resistor, a third resistor, a signal converter, a second light emitting diode and a photoelectric triode, wherein The first end of the sampling resistor is connected to the connection circuit, and the second end of the sampling resistor is grounded; The first input end of the signal converter is connected to the first end of the sampling resistor through the second resistor, and the second input end of the signal converter is connected to the second end of the sampling resistor through the third resistor; The input end of the second light emitting diode is connected to a second power supply, and the output end of the second light emitting diode is connected to the output end of the signal converter; The phototriode is coupled with the second light emitting diode, and an input end of the phototriode is connected with a third power supply, and an output end of the phototriode is grounded; A first input end of the control module is connected with the input end of the phototriode; When the connection circuit is in the leakage state, the signal converter outputs a first level, the second light emitting diode emits light to make the phototriode conductive, the control module receives the first control signal output by the sampling circuit, and generates the second control signal, and if the second control signal meets the first preset condition, the switch circuit controls the first switch to be turned off based on the second control signal; When the connection circuit is in the normal state, the signal converter outputs a second level, the second light emitting diode does not emit light, the phototriode is cut off, the control module receives the first control signal output by the sampling circuit, and generates the second control signal, and if the second control signal meets the second preset condition, the switch circuit controls the first switch to maintain the closed state.

5. The outlet strip device of claim 2, wherein, The protection circuit further comprises a reset circuit, and the reset circuit comprises a fourth resistor, a second switch and a second capacitor, wherein, A first end of the fourth resistor is connected with one end of the second capacitor, a second end of the fourth resistor is connected with a fourth power supply, and the other end of the second capacitor is grounded; The second end of the fourth resistor is further grounded through a first lead wire and a second lead wire, one end of the second switch is connected with the first lead wire, and the other end of the second switch is connected with the second lead wire; The second end of the fourth resistor is further connected with a second input end of the control module; When the second switch is closed, the reset circuit transmits a third control signal to the control module, the control module transmits the second control signal to the switch circuit based on the third control signal, and the switch circuit controls the first switch to be closed based on the second control signal.

6. The outlet strip device of claim 5, wherein, The power strip device further comprises at least one reset button, the reset button is arranged corresponding to the second switch, when the reset button is pressed, the second switch is closed, the reset circuit transmits a third control signal to the control module, the control module generates the second control signal based on the third control signal, and under the condition that the second control signal meets the second preset condition, the switch circuit controls the first switch to be closed based on the second control signal, and the power supply of the corresponding power supply port of the power strip is restored.

7. A method of arc fault protection, characterized by, The method is applied to the power strip device as claimed in any one of claims 1-6, and the method comprises: Receiving a first control signal transmitted by at least one sampling circuit; wherein each sampling circuit samples a corresponding connection circuit; Generating a corresponding second control signal based on each first control signal; Wherein, in response to the first control signal being a first level, the generated second control signal is a second level, and the second control signal is transmitted to a switch circuit to stop the power supply of the corresponding power supply port of the power strip; Or, In response to the first control signal being the second level, the second control signal generated is the first level, and the second control signal is transmitted to the switch circuit to maintain power supply of the corresponding power outlet.

8. The method of claim 7, wherein, The step of receiving the first control signal transmitted by the at least one sampling circuit, and in response to the first control signal being the first level, the second control signal generated is the second level, comprises: In a preset period, a plurality of first control signals transmitted by the same sampling circuit are continuously received, and in response to the plurality of first control signals all being the first level, the second control signal generated is the second level, and the second level is transmitted to the switch circuit.

9. The method of claim 7, wherein, After the step of stopping power supply of the corresponding power outlet, the method further comprises: receiving the first control signal transmitted by the corresponding sampling circuit, and receiving the third control signal transmitted by the corresponding reset circuit; generating the second control signal based on the first control signal and the third control signal, in response to the first control signal being the second level and the third control signal being the first level, the second control signal generated is the first level, and the first level is transmitted to the switch circuit to restore power supply of the corresponding power outlet.

10. The method of claim 9, wherein, The method further comprises, in response to the first control signal being the first level, or in response to the third control signal being the second level, the second control signal generated is the second level, and the second level is transmitted to the switch circuit to maintain the stop power supply state of the corresponding power outlet.

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