Protection circuit and intelligent mattress

Abstract

The utility model discloses a protection circuit and an intelligent mattress. The protection circuit comprises a first circuit board and a second circuit board, the first circuit board comprises a first connection interface and a first switch module, and the second circuit board comprises a second connection interface; the first connection interface is connected to a first power supply through the first switch module; the first connecting interface is used for being plugged with the second connecting interface; and the first switch module is used for being switched off when the first connection interface and the second connection interface are not plugged, so that the first power supply is not output to the first connection interface. By adopting the scheme, the problem that the potential safety hazard is large when the first circuit board and the second circuit board are plugged in a hot mode is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mattresses, in particular to a protection circuit and an intelligent mattress. Background Art

[0002] At present, there are multiple board designs in the module design on the circuit board, which is more conducive to space utilization, especially for use on intelligent mattresses.

[0003] Existing intelligent mattresses usually include multiple circuit boards. The multiple circuit boards at least include a first circuit board and a second circuit board. Both the first circuit board and the second circuit board include connection interfaces. It is necessary for the first circuit board and the second circuit board to be plugged and matched through the connection interfaces so that the first circuit board supplies power to the second circuit board.

[0004] However, when the first circuit board and the second circuit board are plugged and unplugged while being powered on, it may cause arcing at the connection interface, posing a great potential safety hazard. Summary of the Utility Model

[0005] The utility model provides a protection circuit and an intelligent mattress to solve the problem of great potential safety hazard when the first circuit board and the second circuit board are plugged and unplugged while being powered on.

[0006] According to one aspect of the utility model, a protection circuit is provided. The protection circuit includes: a first circuit board and a second circuit board. The first circuit board includes a first connection interface and a first switch module. The second circuit board includes a second connection interface;

[0007] The first connection interface is connected to a first power supply through the first switch module;

[0008] The first connection interface is used for plugging with the second connection interface;

[0009] The first switch module is used to turn off when the first connection interface and the second connection interface are not plugged, so that the first power supply does not output electric energy to the first connection interface.

[0010] In an optional embodiment of the utility model, the first circuit board further includes a second switch module;

[0011] The first connection interface further includes a first control pin, and the second connection interface further includes a second control pin. The first control pin and the second control pin are used to contact and conduct when the first connection interface and the second connection interface are plugged; the second control pin is electrically connected to the ground;

[0012] The second switch module is electrically connected between the first control pin and the first switch module. The second switch module is used to cut off when the first control pin and the second control pin are not in contact, so as to turn off the first switch module.

[0013] In an alternative embodiment of the present invention, the second switch module includes a first triode. The collector of the first triode is electrically connected to the first switch module, and the emitter of the first triode is electrically connected to the first control pin.

[0014] In an alternative embodiment of the present invention, the first connection interface includes a first power supply pin, and the second connection interface includes a second power supply pin. The first power supply pin and the second power supply pin are used to make contact conduction when the first connection interface and the second connection interface are plugged together;

[0015] The first switch module includes a switching MOS transistor. The switching MOS transistor is a PMOS transistor. The gate of the switching MOS transistor is electrically connected to the collector of the first triode. The source of the switching MOS transistor is electrically connected to the first power supply, and the drain of the switching MOS transistor is electrically connected to the first power supply pin.

[0016] In an alternative embodiment of the present invention, the first switch module further includes a first resistor, a second resistor and a first zener diode. The first resistor is connected in series between the collector of the first triode and the gate of the switching MOS transistor. The second resistor is electrically connected between the gate of the switching MOS transistor and the first power supply. The first zener diode is connected in parallel with the first resistor.

[0017] In an alternative embodiment of the present invention, a control module is further included. The first connection interface includes a first detection pin, and the second connection interface includes a second detection pin. The first detection pin and the second detection pin are used to make contact conduction when the first connection interface and the second connection interface are plugged together;

[0018] The first detection pin is electrically connected to the voltage output terminal of the control module. The voltage output terminal of the control module is used to output a first voltage. The second detection pin is electrically connected to the ground;

[0019] The control module is used to control the first triode to turn off when the voltage of the first detection pin is greater than 0V and less than or equal to the first voltage.

[0020] In an alternative embodiment of the present invention, the second switch module includes an optocoupler, and the first triode is the light receiver of the optocoupler;

[0021] The first end of the light source of the optical coupler is electrically connected to the voltage output end of the control module, and the second end of the light source is electrically connected to the control end of the control module;

[0022] The control module is configured to control the light source to be cut off when the voltage of the first detection pin is greater than 0V and less than or equal to the first voltage, and control the light source to be turned on when the voltage of the first detection pin is 0V.

[0023] In an alternative embodiment of the present invention, the light source of the optical coupler is a light-emitting diode. The anode of the light-emitting diode is electrically connected to the voltage output end of the control module, and the cathode of the light-emitting diode is electrically connected to the control end of the control module.

[0024] In an alternative embodiment of the present invention, the first connection interface further includes a first signal pin, and the second connection interface further includes a second signal pin; the protection circuit further includes at least one of the following:

[0025] A third resistor, which is connected in series between the anode of the light-emitting diode and the voltage output end of the control module;

[0026] A fourth resistor, which is connected in series between the first detection pin and the voltage output end of the control module;

[0027] A first protection diode, and the first signal pin is grounded through the first protection diode;

[0028] A second protection diode, and the second signal pin is grounded through the second protection diode.

[0029] According to another aspect of the present invention, there is provided an intelligent mattress, which includes the protection circuit according to any embodiment of the present invention.

[0030] The technical solution of the embodiment of the present invention is to provide a first switch module between the first connection interface and the first power supply. The first switch module is turned off when the first connection interface and the second connection interface are not plugged in, so that the first power supply does not output electrical energy to the first connection interface. Since the first power supply does not output electrical energy to the first connection interface when the first connection interface and the second connection interface are not plugged in, it is possible to avoid the situation of hot plugging the first circuit board and the second circuit board through the first connection interface and the second connection interface. When the two are not fully plugged in, the first connection interface is not energized, solving the problem of great potential safety hazards when hot plugging the first circuit board and the second circuit board.

[0031] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 is the circuit schematic diagram of the first circuit board of a protection circuit provided in Embodiment 1 of the present utility model;

[0034] Figure 2 is the circuit schematic diagram of the second circuit board of a protection circuit provided in Embodiment 1 of the present utility model.

[0035] Wherein: 1. First circuit board; 11. First connection interface; 111. First control pin; 112. First power supply pin; 113. First detection pin; 114. First signal pin; 12. First switch module; 121. Switch MOS transistor; 122. First resistor; 123. Second resistor; 124. First zener diode; 13. Second switch module; 131. First triode; 132. Optocoupler; 133. Light emitting source; 14. Control module; 15. Third resistor; 16. Fourth resistor; 17. First protection diode; 18. First functional module; 19. Fifth resistor; 2. Second circuit board; 21. Second connection interface; 211. Second control pin; 212. Second power supply pin; 213. Second detection pin; 214. Second signal pin; 22. Second protection diode; 23. Second functional module; 3. First power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to enable those skilled in the art to better understand the solutions of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0037] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0038] Embodiment 1

[0039] Embodiment 1 of the present utility model provides a protection circuit, as Figure 1 and Figure 2 shown, the protection circuit includes: a first circuit board 1 and a second circuit board 2. The first circuit board 1 includes a first connection interface 11 and a first switch module 12. The second circuit board 2 includes a second connection interface 21. The first connection interface 11 is used for plugging into the second connection interface 21, that is, the first connection interface 11 and the second connection interface 21 are the interfaces for the first circuit board 1 and the second circuit board 2 to achieve electrical connection.

[0040] The first connection interface 11 is connected to a first power supply 3 through the first switch module 12. The first power supply 3 refers to a power supply that can provide voltage. In some embodiments, the protection circuit is used for an intelligent mattress. Since an intelligent mattress usually operates with a 24V DC voltage, the first power supply 3 is used to provide a 24V voltage. It can be understood that the voltage provided by the first power supply 3 can be set according to the requirements of the first circuit board 1 and the second circuit board 2. When the protection circuit is used in other scenarios, the voltage value provided by the first power supply 3 can also be different. No specific limitation is made here, only for illustration.

[0041] The first switch module 12 is used to turn off when the first connection interface 11 and the second connection interface 21 are not plugged, so that the first power supply 3 does not output to the first connection interface 11. Among them, the first switch module 12 refers to a module that can open or close a circuit. Since the first switch module 12 is electrically connected between the first connection interface 11 and the first power supply 3, when the first switch module 12 is open, the first power supply 3 can output electrical energy to the first connection interface 11. When the first switch module 12 is closed, the first power supply 3 does not output electrical energy to the first connection interface 11.

[0042] In the above solution, by providing a first switch module 12 between the first connection interface 11 and the first power supply 3, the first switch module 12 is turned off when the first connection interface 11 and the second connection interface 21 are not plugged in, so that the first power supply 3 does not output power to the first connection interface 11. Since the first power supply 3 does not output power to the first connection interface 11 when the first connection interface 11 and the second connection interface 21 are not plugged in, it is possible to avoid the situation of hot plugging and unplugging the first circuit board 1 and the second circuit board 2 through the first connection interface 11 and the second connection interface 21. When they are not fully plugged in, the first connection interface 11 is not powered, solving the problem of a large safety hazard when hot plugging and unplugging the first circuit board 1 and the second circuit board 2.

[0043] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the first circuit board 1 further includes a second switch module 13; the first connection interface 11 further includes a first control pin 111, and the second connection interface 21 further includes a second control pin 211. The first control pin 111 and the second control pin 211 are configured to be in contact conduction when the first connection interface 11 and the second connection interface 21 are plugged in; the second control pin 211 is electrically connected to the ground, so when the first connection interface 11 and the second connection interface 21 are plugged in, the first control pin 111 is also electrically connected to the ground through the second control pin 211.

[0044] The second switch module 13 is electrically connected between the first control pin 111 and the first switch module 12. The second switch module 13 is configured to be cut off when the first control pin 111 and the second control pin 211 are not in contact, so as to turn off the first switch module 12. When the first connection interface 11 and the second connection interface 21 are not plugged in properly, at this time the first control pin 111 and the second control pin 211 are not in contact, so that the first control pin 111 is not grounded through the second control pin 211, and further the second switch module 13 cannot be grounded through the first control pin 111, so the second switch module 13 is cut off. The second switch module 13 is electrically connected between the first switch module 12 and the first control pin 111, so when the second switch module 13 is cut off, the first switch module 12 is turned off, so that at this time the first power supply 3 does not output electrical energy to the first connection interface 11, realizing that the first connection interface 11 is not powered when the first connection interface 11 and the second connection interface 21 are not plugged in properly, and avoiding hot plugging and unplugging the first circuit board 1 and the second circuit board 2.

[0045] In an alternative embodiment of the present invention, as Figure 1 and Figure 2As shown in the figure, the second switch module 13 includes a first triode 131. The collector of the first triode 131 is electrically connected to the first switch module 12, and the emitter of the first triode 131 is electrically connected to the first control pin 111. Therefore, when the first control pin 111 is not in contact with the second control pin 211 to achieve grounding, the first triode 131 cannot be turned on, so the first switch module 12 is turned off, and the first power supply 3 does not output electrical energy to the first connection interface 11. Only when the first control pin 111 is in contact with the second control pin 211 to achieve grounding, the first triode 131 has the possibility of being turned on, and then the first switch module 12 has the possibility of being turned on. Therefore, through the first triode 131, it can be achieved that the first connection interface 11 is not powered when the first connection interface 11 and the second connection interface 21 are not plugged in properly.

[0046] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the first connection interface 11 includes a first power supply pin 112, and the second connection interface 21 includes a second power supply pin 212. The first power supply pin 112 refers to the pin of the first circuit board 1 for outputting electrical energy, and the second power supply pin 212 refers to the pin of the second circuit board 2 for receiving electrical energy from the first circuit board 1. The first power supply pin 112 and the second power supply pin 212 are used to make contact conduction when the first connection interface 11 and the second connection interface 21 are plugged in.

[0047] The first switch module 12 includes a switching MOS transistor 121. The switching MOS transistor 121 is a PMOS transistor. The gate of the switching MOS transistor 121 is electrically connected to the collector of the first triode 131. The source of the switching MOS transistor 121 is electrically connected to the first power supply 3, and the drain of the switching MOS transistor 121 is electrically connected to the first power supply pin 112. Therefore, when the first triode 131 is turned on, the switching MOS transistor 121 is turned on, and at this time, the electrical energy of the first power supply 3 can be transmitted to the first power supply pin 112. When the first triode 131 is turned off, the switching MOS transistor 121 is turned off, and at this time, the electrical energy of the first power supply 3 cannot be transmitted to the first power supply pin 112.

[0048] Based on the above embodiments, the first switch module 12 further includes a first resistor 122, a second resistor 123, and a first voltage stabilizing diode 124. The first resistor 122 is connected in series between the collector of the first triode 131 and the gate of the switching MOS transistor 121. The second resistor 123 is electrically connected between the gate of the switching MOS transistor 121 and the first power supply 3. The first voltage stabilizing diode 124 is connected in parallel with the first resistor 122. Among them, the first resistor 122 and the second resistor 123 can play the roles of current limiting, oscillation suppression, protecting the switching MOS transistor 121, and providing a bias voltage. The main function of the first voltage stabilizing diode 124 is to prevent the gate of the switching MOS transistor 121 from being broken down, thereby improving the working reliability of the switching MOS transistor 121 and protecting the switching MOS transistor 121 from damage.

[0049] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the first circuit board 1 includes a second power supply, and the second power supply is electrically connected to the base of the first triode 131. The second power supply is used to provide a conduction voltage for the first triode 131, so that the first triode 131 will conduct when the first control pin 111 is in contact with the second control pin 211, enabling the first switch module 12 to conduct, and the first triode 131 will turn off when the first control pin 111 is not in contact with the second control pin 211, enabling the first switch module 12 to turn off. It can be understood that in other embodiments, the first circuit board 1 may also include other structures to enable the first triode 131 to conduct when the first control pin 111 is in contact with the second control pin 211, which is not specifically limited here, and is only for illustration. Another implementation manner of the conduction of the first triode 131 will be described below.

[0050] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the protection circuit further includes a control module 14. Among them, the control module 14 refers to a functional module capable of performing logical control. In some embodiments, the control module 14 is an MCU.

[0051] The first connection interface 11 includes a first detection pin 113, and the second connection interface 21 includes a second detection pin 213. The first detection pin 113 and the second detection pin 213 are used to make contact and conduct when the first connection interface 11 and the second connection interface 21 are plugged together. The first detection pin 113 is electrically connected to the voltage output terminal of the control module 14, and the voltage output terminal of the control module 14 is used to output a first voltage. The second detection pin 213 is electrically connected to the ground. Therefore, when the first connection interface 11 and the second connection interface 21 are plugged together, the first detection pin 113 and the second detection pin 213 make contact and conduct. At this time, the first detection pin 113 is also grounded, and the voltage of the first detection pin 113 is 0V. When the first connection interface 11 and the second connection interface 21 are not plugged together, the voltage of the first detection pin 113 is the first voltage. When the first connection interface 11 and the second connection interface 21 are in poor contact, the voltage of the first detection pin 113 is greater than 0V and less than the first voltage.

[0052] The control module 14 is used to turn off the first triode 131 when the voltage of the first detection pin 113 is greater than 0V and less than or equal to the first voltage. Therefore, when the first connection interface 11 and the second connection interface 21 are not plugged together or in poor contact, the first triode 131 is turned off, the first switch module 12 is turned off, and the first power supply 3 does not output electrical energy to the first connection interface 11, reducing the damage of the devices on the first circuit board 1 caused by poor contact and the arcing between the first connection interface 11 and the second connection interface 21, and reducing the safety hazard.

[0053] In an alternative embodiment of the present invention, as Figure 1 and Figure 2 shown, the second switch module 13 includes an optocoupler 132, and the first triode 131 is the light receiver of the optocoupler 132. The first end of the light emitting source 133 of the optocoupler 132 is electrically connected to the voltage output terminal of the control module 14, and the second end of the light emitting source 133 is electrically connected to the control terminal of the control module 14. The control module 14 is used to turn off the light emitting source 133 when the voltage of the first detection pin 113 is greater than 0V and less than or equal to the first voltage, and turn on the light emitting source 133 when the voltage of the first detection pin 113 is 0V.

[0054] Among them, when the light source 133 is turned off, it does not emit light. As a result, the first triode 131, acting as a light receiver, will be turned off. When the light source 133 is turned on, it emits light, and the first triode 131, acting as a light receiver, can be turned on. When the first connection interface 11 and the second connection interface 21 are not plugged in or have poor contact, the light source 133 is turned off, the first triode 131 is turned off, and the first switch module 12 is turned off. The first power supply 3 does not output electrical energy to the first connection interface 11. In addition, the optocoupler 132 realizes the isolation between the light receiver and the light source 133, thus preventing the high voltage in the second circuit board 2 from being transmitted to the first circuit board 1 through the second connection interface 21 and the first connection interface 11 when the first circuit board 1 and the second circuit board 2 are plugged in, which may damage isolation devices such as the control module 14, and realizing the protection of the first circuit board 1 when the first circuit board 1 supplies power to the second circuit board 2.

[0055] In an alternative embodiment of the present invention, the first triode 131 is a photosensitive triode, and the light source 133 of the optocoupler 132 is a light-emitting diode. The anode of the light-emitting diode is electrically connected to the voltage output terminal of the control module 14, and the cathode of the light-emitting diode is electrically connected to the control terminal of the control module 14. Therefore, the control module 14 can control the light-emitting diode to emit light or not by outputting different voltages. In some embodiments, the control module 14 is configured to output a high voltage to the cathode of the light-emitting diode through the control terminal of the control module 14 when the voltage of the first detection pin 113 is greater than 0V and less than or equal to the first voltage, so that the light-emitting diode is turned off and does not emit light. The control module 14 is also configured to output a low voltage to the cathode of the light-emitting diode through the control terminal of the control module 14 when the voltage of the first detection pin 113 is 0V, so that the light-emitting diode is turned on and emits light. Here, the high voltage refers to a voltage greater than the first voltage, and the low voltage refers to a voltage lower than the first voltage.

[0056] In some embodiments, the control module 14 is an MCU, and at this time, the first voltage is correspondingly 3.3V. It can be understood that in other embodiments, the control module 14 is other devices, and the first voltage can also be other voltage values, which are not specifically limited herein.

[0057] In an alternative embodiment of the present invention, such as Figure 1 and Figure 2As shown, the first connection interface 11 further includes a first signal pin 114, and the second connection interface 21 further includes a second signal pin 214. The first signal pin 114 and the second signal pin 214 are used to make contact and conduct when the first connection interface 11 and the second connection interface 21 are plugged together. The protection circuit further includes a first protection diode 17 and a second protection diode 22. The first signal pin 114 is grounded through the first protection diode 17, and the second signal pin 214 is grounded through the second protection diode 22. Grounding the first signal pin 114 through the first protection diode 17 and grounding the second signal pin 214 through the second protection diode 22 can protect the precision components in the electronic circuit from damage by instantaneous voltage or current.

[0058] In an alternative embodiment of the present utility model, the protection circuit further includes a third resistor 15. The third resistor 15 is connected in series between the anode of the light-emitting diode and the voltage output terminal of the control module 14. By providing the third resistor 15, the effects of adjusting impedance matching, improving circuit stability, and protecting the light-emitting diode can be achieved.

[0059] In an alternative embodiment of the present utility model, as Figure 1 and Figure 2 shown, the protection circuit further includes a fourth resistor 16. The fourth resistor 16 is connected in series between the first detection pin 113 and the voltage output terminal of the control module 14, thereby preventing the control module 14 from being damaged by excessive current.

[0060] In an alternative embodiment of the present utility model, as Figure 1 shown, the first circuit board 1 further includes a first functional module 18. Both the first signal pin 114 and the first detection pin 113 are electrically connected to the first functional module 18. The first functional module 18 refers to a circuit on the first circuit board 1 that can achieve other functions. The functions achieved by the first functional module 18 are not specifically limited herein. In some embodiments, the control module 14 is part of the first functional module 18. In some embodiments, the control module 14 is independent of the first functional module 18. This is not specifically limited herein. Preferably, a fifth resistor 19 is connected in series between the first signal pin 114 and the first functional module 18. The fifth resistor 19 can stabilize the current and improve the quality and accuracy of signal transmission.

[0061] In an alternative embodiment of the present utility model, as Figure 2 shown, the second circuit board 2 further includes a second functional module 23. Both the second signal pin 214 and the second detection pin 213 are electrically connected to the second functional module 23. The second functional module 23 refers to a circuit on the second circuit board 2 that can achieve other functions. The functions achieved by the second functional module 23 are not specifically limited herein.

[0062] Embodiment 2

[0063] Embodiment 2 of the present utility model provides an intelligent mattress, which includes the protection circuit of any embodiment of the present utility model.

[0064] The above specific implementation manners do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A protection circuit, characterized in that, Comprising: A first circuit board and a second circuit board, the first circuit board includes a first connection interface and a first switch module, and the second circuit board includes a second connection interface; The first connection interface is connected to a first power supply through the first switch module; The first connection interface is used for plugging into the second connection interface; The first switch module is used to turn off when the first connection interface and the second connection interface are not plugged, so that the first power supply does not output electrical energy to the first connection interface.

2. The protection circuit according to claim 1, characterized in that The first circuit board further includes a second switch module; The first connection interface further includes a first control pin, and the second connection interface further includes a second control pin. The first control pin and the second control pin are used to conduct when the first connection interface and the second connection interface are plugged; the second control pin is electrically connected to the ground; The second switch module is electrically connected between the first control pin and the first switch module. The second switch module is used to cut off when the first control pin and the second control pin do not contact, so that the first switch module is turned off.

3. The protection circuit according to claim 2, wherein The second switch module includes a first triode. The collector of the first triode is electrically connected to the first switch module, and the emitter of the first triode is electrically connected to the first control pin.

4. The protection circuit according to claim 3, wherein The first connection interface includes a first power supply pin, and the second connection interface includes a second power supply pin. The first power supply pin and the second power supply pin are used to conduct when the first connection interface and the second connection interface are plugged; The first switch module includes a switching MOS transistor, the switching MOS transistor is a PMOS transistor. The gate of the switching MOS transistor is electrically connected to the collector of the first triode. The source of the switching MOS transistor is electrically connected to the first power supply, and the drain of the switching MOS transistor is electrically connected to the first power supply pin.

5. The protection circuit according to claim 4, wherein The first switch module further includes a first resistor, a second resistor and a first zener diode. The first resistor is connected in series between the collector of the first triode and the gate of the switching MOS transistor. The second resistor is electrically connected between the gate of the switching MOS transistor and the first power supply. The first zener diode is connected in parallel with the first resistor.

6. The protection circuit according to any one of claims 3 to 5, characterized in that It further includes a control module. The first connection interface includes a first detection pin, and the second connection interface includes a second detection pin. The first detection pin and the second detection pin are used to conduct when the first connection interface and the second connection interface are plugged; The first detection pin is electrically connected to the voltage output terminal of the control module. The voltage output terminal of the control module is used to output a first voltage. The second detection pin is electrically connected to the ground; The control module is used to control the first triode to turn off when the voltage of the first detection pin is greater than 0V and less than or equal to the first voltage.

7. The protection circuit according to claim 6, characterized in that The second switch module includes an optocoupler, and the first triode is the light receiver of the optocoupler; The first end of the light emitting source of the optocoupler is electrically connected to the voltage output terminal of the control module, and the second end of the light emitting source is electrically connected to the control terminal of the control module; The control module is configured to control the light source to be turned off when the voltage of the first detection pin is greater than 0V and less than or equal to the first voltage, and control the light source to be turned on when the voltage of the first detection pin is 0V.

8. The protection circuit according to claim 7, characterized in that, The light source of the optocoupler is a light-emitting diode. The anode of the light-emitting diode is electrically connected to the voltage output terminal of the control module, and the cathode of the light-emitting diode is electrically connected to the control terminal of the control module.

9. The protection circuit according to claim 8, characterized in that, The first connection interface further includes a first signal pin, and the second connection interface further includes a second signal pin; the protection circuit further includes at least one of the following: A third resistor, which is connected in series between the anode of the light-emitting diode and the voltage output terminal of the control module; A fourth resistor, which is connected in series between the first detection pin and the voltage output terminal of the control module; A first protection diode, and the first signal pin is grounded through the first protection diode; A second protection diode, and the second signal pin is grounded through the second protection diode.

10. An intelligent mattress, characterized in that, Comprising the protection circuit according to any one of claims 1-9.

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