Power supply detection turn-off circuit, power supply base and power receiving equipment

Abstract

The embodiment of the utility model provides a power supply detection turn-off circuit, a power supply base and a power receiving device, specifically, the power supply base is provided with the power supply detection turn-off circuit, the power supply detection turn-off circuit is provided with a third contact end and a fourth contact end, and after the power receiving device is charged and taken down by a user, the third contact end and the fourth contact end are turned off. The third contact end and the fourth contact end of the power supply detection turn-off circuit are disconnected, so that the fourth contact end is not grounded any more, the level of the fourth contact end is pulled up, the switch switching module is prompted to be switched into a cut-off state, and current is prevented from flowing from the power supply input end to the power supply output end through the switch switching module. According to the embodiment of the invention, through a hardware detection mode, after a user takes down the power receiving equipment, the power supply base can be turned off in time, the possibility of damage to the power supply base is reduced, and the use safety of the power supply base is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a power supply detection shutdown circuit, a power supply base and a power receiving device. BACKGROUND

[0002] In the related art, the power receiving device can be set on the power supply base by automatic adsorption or natural placement, so as to realize power supply of the power receiving device through the power supply base. For example, smart watches, tablet computers, central control screens and other portable electronic devices are widely used.

[0003] However, after the power receiving device is charged and the user takes off the power receiving device, if the power supply base is not turned off in time, the power supply may be ignited due to external short circuit, which may damage the power supply base or cause harm to the person. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a power supply detection shutdown circuit, a power supply base and a power receiving device, which can turn off the power supply base in time after the user takes off the power receiving device through hardware detection.

[0005] In a first aspect, the present application provides a power supply detection shutdown circuit, which is arranged in a power supply base, the power supply base is used for supplying power to a power receiving device, the power receiving device is provided with a first contact end, a second contact end and a power receiving interface, wherein the first contact end and the second contact end are conductively connected; the power supply detection shutdown circuit comprises:

[0006] a power supply input end and a power supply output end, the power supply input end is used for connecting to a power supply, and the power supply output end is used for movably connecting to the power receiving interface;

[0007] a third contact end and a fourth contact end, the third contact end is used for movably connecting with the first contact end, and the fourth contact end is used for movably connecting with the second contact end, wherein the third contact end is a ground end;

[0008] a switch switching module, which is connected to the power supply input end, the power supply output end and the fourth contact end respectively;

[0009] In the case that the power receiving device is separated from the power supply base, the third contact end and the first contact end are separated from each other, and the fourth contact end and the second contact end are separated from each other, and the switch switching module cuts off the current flowing from the power supply input end to the power supply output end.

[0010] According to some embodiments of the present application, when the powered device is placed on the power supply base, the third contact end and the first contact end are in contact, and the fourth contact end and the second contact end are in contact, and the switch switching module turns on the current flowing from the power supply input end to the power supply output end.

[0011] In a second aspect, embodiments of the present application provide a power supply detection shutdown circuit, which is arranged in a power supply base, the power supply base is used for supplying power to a powered device, and the powered device is provided with a powered interface; the power supply detection shutdown circuit comprises:

[0012] a power supply input end and a power supply output end, the power supply input end is used for being connected to a power supply, and the power supply output end is used for being movably connected to the powered interface;

[0013] a third contact end, a fourth contact end and an elastic component, the third contact end and the fourth contact end are used for realizing conductive connection through the elastic component, and the third contact end is a ground end;

[0014] a switch switching module, which is connected to the power supply input end, the power supply output end and the fourth contact end respectively;

[0015] When the powered device is separated from the power supply base, the elastic component is in a first deformation state, the third contact end and the fourth contact end are separated from the conductive connection, and the switch switching module cuts off the current flowing from the power supply input end to the power supply output end.

[0016] According to some embodiments of the present application, when the powered device is placed on the power supply base, the elastic component is switched from the first deformation state to a second deformation state, the third contact end and the fourth contact end are in conductive connection, and the switch switching module turns on the current flowing from the power supply input end to the power supply output end.

[0017] According to some embodiments of the present application, the switch switching module comprises a switch tube, an input pole of the switch tube is connected to the power supply input end, an output pole of the switch tube is connected to the power supply output end, and a control pole of the switch tube is connected to the fourth contact end.

[0018] According to some embodiments of the present application, the switch tube is a MOS tube, a source pole of the MOS tube is connected to the power supply input end, a drain pole of the MOS tube is connected to the power supply output end, and a gate pole of the MOS tube is connected to the fourth contact end.

[0019] According to some embodiments of the present application, the switch tube is a triode, an emitter of the triode is connected to the power input end, a base of the triode is connected to the power output end, and a collector of the triode is connected to the fourth contact end.

[0020] According to some embodiments of the present application, the switch switching module further comprises a first voltage dividing element and a second voltage dividing element, the power input end is connected to the fourth contact end in sequence through the first voltage dividing element and the second voltage dividing element, and a common connection end between the first voltage dividing element and the second voltage dividing element is connected to a control electrode of the switch tube.

[0021] According to some embodiments of the present application, the first voltage dividing element and the second voltage dividing element are both resistance elements.

[0022] In a third aspect, the embodiments of the present application further provide a power supply base comprising the power detection and shutdown circuit as described in the first aspect or the second aspect.

[0023] In a fourth aspect, the embodiments of the present application further provide a power receiving device, which is used in matching with the power supply base as described in the third aspect, and the power supply base is used to supply power to the power receiving device through the power detection and shutdown circuit.

[0024] According to some embodiments of the present application, the power receiving device is fixed to the power supply base by magnetic attraction.

[0025] The technical scheme according to the embodiments of the present application has at least the following beneficial effects: the embodiments of the present application set the power detection and shutdown circuit in the power supply base, and the power detection and shutdown circuit is provided with a third contact end and a fourth contact end, after the power receiving device completes charging and the user takes down the power receiving device, the connection between the third contact end and the fourth contact end of the power detection and shutdown circuit is disconnected, so that the fourth contact end is no longer grounded, and the level of the fourth contact end is pulled high to make the switch switching module switch to the cutoff state, preventing the current from flowing from the power input end to the power output end through the switch switching module, therefore, the embodiments of the present application can timely shut down the power supply base after the user takes down the power receiving device by the hardware detection mode, and reduce the possibility of damage to the power supply base, and improve the use safety of the power supply base.

[0026] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used to explain the technical scheme of the present application together with the embodiments of the present application, and do not constitute a limitation to the technical scheme of the present application.

[0028] Figure 1 is a circuit schematic diagram of a power supply detection shutdown circuit provided by an embodiment of the present application;

[0029] Figure 2 is a schematic diagram of the third contact end and the fourth contact end provided on the power supply base according to an embodiment of the present application;

[0030] Figure 3 is a schematic diagram of the first contact end and the second contact end provided on the powered device according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of embodiments are shown, and the same or similar notations are used to represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0032] In the description of the present application, it should be understood that, if the orientation description, such as up, down, front, back, left, right, etc. is indicated, the orientation or position relationship based on the orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0034] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.

[0035] In this paper, the serial number of the component itself, such as "first", "second", etc., is only used to distinguish the described object, and does not have any order or technical meaning. Unless otherwise specified, the "connection" and "coupling" in the present application include direct and indirect connection (coupling).

[0036] In the description of the present application, the words such as setting, installing, connecting and the like should be understood in a broad sense unless otherwise explicitly limited, and the skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0037] In some cases, the power receiving device can be set on the power supply base by automatic adsorption or natural placement, so as to realize power supply of the power receiving device through the power supply base. For example, smart watches, tablet computers, central control screens and other portable electronic devices are widely used.

[0038] However, after the power receiving device completes charging and the user takes off the power receiving device, if the power supply base does not turn off in time, a power supply spark may occur due to external short circuit, which may damage the power supply base or cause personal injury.

[0039] Based on the above situation, the present application embodiment proposes a power supply detection shutdown circuit, a power supply base and a power receiving device, which aims to turn off the power supply base in time after the user takes off the power receiving device through hardware detection.

[0040] The various embodiments of the power supply detection shutdown circuit of the present application will be further described below in combination with the drawings.

[0041] In an embodiment, the power receiving device 200 and the power supply base 100 are used in matching, wherein when the power receiving device 200 is placed on the power supply base 100, the power supply base 100 can supply power to the power receiving device 200. Specifically, the power receiving device 200 is provided with a power receiving interface, and the power supply base 100 can be provided with a power supply detection shutdown circuit as shown in Figure 1 The power supply detection shutdown circuit includes but is not limited to a power supply input terminal Vin and a power supply output terminal Vout, wherein the power supply detection shutdown circuit is connected to the power supply E1 through the power supply input terminal Vin, and connected to the power receiving interface through the power supply output terminal Vout, so as to charge the power receiving device 200.

[0042] In an embodiment, in order to automatically turn off the power supply base 100 in time after the user takes off the power receiving device 200, the present application embodiment can set multiple contact terminals on both sides of the power supply base 100 and the power receiving device 200, specifically as shown in Figures 1 to 3As shown, the power receiving device 200 is provided with a first contact end GND-1 and a second contact end GND-2, and the first contact end GND-1 and the second contact end GND-2 are electrically connected. Correspondingly, the power supply detection and shutdown circuit on the power supply base 100 further includes but is not limited to a third contact end GND, a fourth contact end Det, and a switch switching module 110. The third contact end GND is used to be actively connected with the first contact end GND-1, and the fourth contact end Det is used to be actively connected with the second contact end GND-2. The third contact end GND is a ground end, and the switch switching module 110 is connected to the power supply input end Vin, the power supply output end Vout, and the fourth contact end Det, respectively.

[0043] Specifically, when the power receiving device 200 is placed on the power supply base 100, the first contact end GND-1 of the power receiving device 200 will be in contact with the third contact end GND of the power supply detection and shutdown circuit, and the second contact end GND-2 of the power receiving device 200 will be in contact with the fourth contact end Det of the power supply detection and shutdown circuit. Since the first contact end GND-1 and the second contact end GND-2 of the power receiving device 200 are electrically connected, when the power receiving device 200 is placed on the power supply base 100, the third contact end GND and the fourth contact end Det of the power supply detection and shutdown circuit will form a conduction, and when the third contact end GND and the fourth contact end Det are in conduction, the switch switching module 110 will be triggered to convert to a conduction state, so that the output current of the power supply E1 will be supplied to the power receiving device 200 through the power supply input end Vin, the switch switching module 110, and the power supply output end Vout in turn.

[0044] In addition, after the user removes the power receiving device 200, that is, after the power receiving device 200 is separated from the power supply base 100, the first contact end GND-1 of the power receiving device 200 will be disconnected from the third contact end GND of the power supply detection and shutdown circuit, and the second contact end GND-2 of the power receiving device 200 will be disconnected from the fourth contact end Det of the power supply detection and shutdown circuit, so that the third contact end GND and the fourth contact end Det of the power supply detection and shutdown circuit will be disconnected. When the third contact end GND and the fourth contact end Det are disconnected, the switch switching module 110 will be triggered to convert to a cut-off state, so as to cut off the current flowing from the power supply input end Vin to the power supply output end Vout, thereby being able to timely shut down the power supply base 100.

[0045] It should be noted that after the power receiving device 200 completes charging and the user removes the power receiving device 200, the connection between the third contact end GND and the fourth contact end Det of the power supply detection shutdown circuit is disconnected, so that the fourth contact end Det is no longer grounded, and the level of the fourth contact end Det is pulled high to make the switch switching module 110 switch to the cutoff state, preventing current from flowing from the power supply input end Vin to the power supply output end Vout through the switch switching module 110. Therefore, the embodiment of the present application can timely shut down the power supply base 100 after the user removes the power receiving device 200 through the hardware detection mode, thereby reducing the possibility of damage to the power supply base 100 and improving the use safety of the power supply base 100.

[0046] It can be understood that, as shown in Figure 2 , the third contact end GND and the fourth contact end Det of the power supply detection shutdown circuit can be provided on the power supply base 100 in the form of conductive contacts such as solder pads or metal sheets.

[0047] In addition, the first contact end GND-1 and the second contact end GND-2 of the power receiving device 200 can be in the form of a combination of two conductive contacts and a conductive wire 210 as shown in Figure 3 . Secondly, the first contact end GND-1 and the second contact end GND-2 of the power receiving device 200 can also be regarded as the two ends of a conductive sheet, that is, the power receiving device 200 is provided with a conductive sheet, one end of the conductive sheet is the first contact end GND-1, and the other end is the second contact end GND-2.

[0048] In an embodiment, in addition to the above-mentioned scheme of simultaneously providing multiple contact ends on both sides of the power supply base 100 and the power receiving device 200 to control the power supply base 100 to automatically shut down, the embodiment of the present application can separately provide multiple contact ends on one side of the power supply base 100 to control the power supply base 100 to automatically shut down, as follows:

[0049] Specifically, the power supply detection shutdown circuit on the power supply base 100 further includes but is not limited to a third contact end GND, a fourth contact end Det, a switch switching module 110, and an elastic component, wherein the third contact end GND and the fourth contact end Det are used to realize conductive connection through the elastic component, the third contact end GND is a ground end, and in addition, the switch switching module 110 is connected to the power supply input end Vin, the power supply output end Vout, and the fourth contact end Det, respectively.

[0050] When the user places the powered device 200 on the power supply base 100, under the action of the powered device 200, the elastic assembly will be elastically deformed and be in a second deformed state. When the elastic assembly is in the second deformed state, the third contact end GND and the fourth contact end Det of the power supply detection shutdown circuit will be in direct contact or indirect conductive contact. Therefore, when the powered device 200 is placed on the power supply base 100, the third contact end GND and the fourth contact end Det of the power supply detection shutdown circuit will form a conduction, and when the third contact end GND and the fourth contact end Det are in conduction, the switch switching module 110 will be triggered to switch to a conduction state, so that the output current of the power supply E1 will be supplied to the powered device 200 through the power supply input end Vin, the switch switching module 110 and the power supply output end Vout in turn.

[0051] In addition, after the user removes the powered device 200, that is, the powered device 200 is separated from the power supply base 100, the elastic assembly will recover the elastic deformation and switch to the first deformed state under the action of the powered device 200. When the elastic assembly is in the first deformed state, the third contact end GND and the fourth contact end Det of the power supply detection shutdown circuit will be disconnected. When the third contact end GND and the fourth contact end Det are disconnected, the switch switching module 110 will be triggered to switch to a cut-off state, so as to cut off the current flowing from the power supply input end Vin to the power supply output end Vout, thereby being able to timely shut down the power supply base 100.

[0052] It can be understood that the elastic assembly described above can be an electrically conductive elastic sheet, or a combination structure of a spring and an electrically conductive metal sheet, and the structure of the elastic assembly is not limited in the embodiment.

[0053] Therefore, the embodiment can also timely shut down the power supply base 100 through a hardware detection mode after the user removes the powered device 200, thereby reducing the possibility of damage of the power supply base 100 and improving the use safety of the power supply base 100.

[0054] Based on the two structure modes that can timely shut down the power supply base 100, the following settings can be made:

[0055] In an embodiment, the switch switching module 110 includes but is not limited to a switch tube Q1, the input pole of the switch tube Q1 is connected to the power supply input end Vin, the output pole of the switch tube Q1 is connected to the power supply output end Vout, and the control pole of the switch tube Q1 is connected to the fourth contact end Det.

[0056] Specifically, the embodiment of the present application can control the on or off state between the input terminal and the output terminal of the switch tube Q1 by controlling the control terminal of the switch tube Q1, and specifically, can control the on or off state of the switch tube Q1 by controlling the level of the control terminal of the switch tube Q1.

[0057] When the switch tube Q1 is on, the output current of the power supply E1 is sequentially supplied to the powered device 200 through the power supply input terminal Vin, the switch switching module 110 and the power supply output terminal Vout; when the switch tube Q1 is off, the output current of the power supply E1 cannot be supplied to the powered device 200 through the power supply input terminal Vin, the switch switching module 110 and the power supply output terminal Vout.

[0058] It can be understood that, regarding the structure of the switch tube Q1 described above, it can be a MOS tube, a triode, or other components with on or off function.

[0059] When the switch tube Q1 is a MOS tube, the source of the MOS tube is connected to the power supply input terminal Vin, the drain of the MOS tube is connected to the power supply output terminal Vout, and the gate of the MOS tube is connected to the fourth contact terminal Det. The MOS tube can also carry a parasitic diode.

[0060] When the switch tube Q1 is a triode, the emitter of the triode is connected to the power supply input terminal Vin, the base of the triode is connected to the power supply output terminal Vout, and the collector of the triode is connected to the fourth contact terminal Det.

[0061] In an embodiment, the switch switching module 110 further comprises a first voltage dividing element R1 and a second voltage dividing element R2, the power supply input terminal Vin is connected to the fourth contact terminal Det through the first voltage dividing element R1 and the second voltage dividing element R2 in sequence, and the common connection terminal between the first voltage dividing element R1 and the second voltage dividing element R2 is connected to the control terminal of the switch tube Q1.

[0062] Since the control terminal of the switch tube Q1 is connected to the common connection terminal between the first voltage dividing element R1 and the second voltage dividing element R2, the level of the common connection terminal between the first voltage dividing element R1 and the second voltage dividing element R2 can be controlled to control the on or off state of the switch tube Q1. Specifically, when the third contact terminal GND and the fourth contact terminal Det are disconnected, the level of the control terminal of the switch tube Q1 is pulled up to the output voltage of the power supply E1, so that the switch tube Q1 is off; when the third contact terminal GND and the fourth contact terminal Det are in conductive contact, since the third contact terminal GND is a ground terminal, the level of the control terminal of the switch tube Q1 is pulled down, so that the switch tube Q1 is on.

[0063] It can be understood that, regarding the first voltage dividing element R1 and the second voltage dividing element R2, they can be resistance elements.

[0064] Based on the power detection shutdown circuit of each of the above embodiments, the power detection shutdown circuit of the embodiments of the present application is described as follows:

[0065] As shown in Figures 1 to 3 When the user removes the powered device, the Det at the power supply base end is disconnected with the GND-1 at the powered device end, the resistance R2 is floating, the level of the G electrode of the switch tube Q1 is pulled up to Vin, Q1 is cut off, Vout has no output, and thus the power output of the power supply base is turned off.

[0066] When the user installs the powered device, the Det at the power supply base end forms a loop through the GND-1 at the powered device end and the GND at the power supply base end, the Det is pulled down, the level of the G electrode of the switch tube Q1 is pulled down, Q1 is turned on, Vout is output, and the power supply base power supply works normally.

[0067] The technical solutions of the embodiments of the present application have the following technical effects: First, the power detection shutdown circuit can detect the installation or removal state of the powered device in real time, quickly respond, and control the power supply base to turn on or off the power supply; it meets the normal output of the power supply base when the powered device is installed and the normal shutdown of the power supply base when the powered device is removed, ensuring safety; second, the power detection shutdown circuit uses a hardware detection method and does not involve chips and complex software logic, so the application is simpler and the cost is lower; the installation state of the powered device is detected by hardware, which is more comprehensive and reliable than software logic, and the materials used in the circuit are conventional materials, so the cost is lower; and only the main board PCB needs to be modified, and the modification period is short. In addition, the power detection shutdown circuit has strong universality and can be applied to various automatic adsorption power supply applications, such as smart watches, tablet computers, intelligent central control screens, and other portable electronic devices.

[0068] Based on the power detection shutdown circuit of each of the above embodiments, the power supply base and the powered device of the present application are respectively proposed as follows.

[0069] In an embodiment, the power supply base of the embodiments of the present application includes but is not limited to the power detection shutdown circuit of any of the above embodiments.

[0070] It is worth noting that since the power supply base of the embodiments of the present application includes the power detection shutdown circuit of any of the above embodiments, the specific implementation and technical effects of the power supply base of the embodiments of the present application can refer to the specific implementation and technical effects of the power detection shutdown circuit of any of the above embodiments.

[0071] In an embodiment, the powered device of the embodiments of the present application is used in matching with the power supply base of any of the above embodiments, and the power supply base is used to supply power to the powered device through the power detection shutdown circuit.

[0072] In an embodiment, the power receiving device can be fixed to the power supply base by magnetic attraction, or can be fixed to the power supply base by natural placement, and the application does not make specific limitations on this.

[0073] It should be understood that, in the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases of only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0074] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of units is only a logical functional division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed ones can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms. The units described as separate components can be or can not be physically separated, and the components displayed as units can be or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiment.

[0075] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A power supply detection and shutdown circuit, characterized in that, The power supply base is installed to supply power to the powered device. The powered device has a first contact terminal, a second contact terminal, and a power receiving interface, wherein the first contact terminal and the second contact terminal are electrically connected. The power detection and shutdown circuit includes: The power supply input terminal is used to connect to a power supply, and the power supply output terminal is used to be movably connected to the power receiving interface. A third contact terminal and a fourth contact terminal, wherein the third contact terminal is used to be movably connected to the first contact terminal, and the fourth contact terminal is used to be movably connected to the second contact terminal, wherein the third contact terminal is a ground terminal; A switch switching module is connected to the power input terminal, the power output terminal, and the fourth contact terminal, respectively. When the powered device is detached from the power supply base, the third contact terminal and the first contact terminal, as well as the fourth contact terminal and the second contact terminal, are disconnected, and the switch switching module cuts off the current flowing from the power supply input terminal to the power supply output terminal.

2. The power detection and shutdown circuit according to claim 1, characterized in that, When the powered device is placed on the power supply base, the third contact terminal is in contact with the first contact terminal and the fourth contact terminal is in contact with the second contact terminal, and the switch switching module conducts the current flowing from the power supply input terminal to the power supply output terminal.

3. A power supply detection and shutdown circuit, characterized in that, The power supply base is installed on the power supply base for supplying power to the powered device, and the powered device is provided with a power receiving interface; the power detection and shutdown circuit includes: The power supply input terminal is used to connect to a power supply, and the power supply output terminal is used to be movably connected to the power receiving interface. The third contact terminal, the fourth contact terminal, and the elastic component are provided, wherein the third contact terminal and the fourth contact terminal are used to achieve a conductive connection through the elastic component, and the third contact terminal is a ground terminal. A switch switching module is connected to the power input terminal, the power output terminal, and the fourth contact terminal, respectively. When the powered device is detached from the power supply base, the elastic component is in a first deformation state, the third contact end and the fourth contact end are no longer conductively connected, and the switch switching module cuts off the current flowing from the power supply input end to the power supply output end.

4. The power detection and shutdown circuit according to claim 3, characterized in that, When the powered device is placed on the power supply base, the elastic component switches from the first deformation state to the second deformation state, the third contact end and the fourth contact end are electrically connected, and the switch switching module conducts the current flowing from the power supply input end to the power supply output end.

5. The power detection and shutdown circuit according to any one of claims 1 to 4, characterized in that, The switching module includes a switching transistor, the input terminal of which is connected to the power supply input terminal, the output terminal of which is connected to the power supply output terminal, and the control terminal of which is connected to the fourth contact terminal.

6. The power detection and shutdown circuit according to claim 5, characterized in that, The switching transistor is a MOSFET, with its source connected to the power supply input terminal, its drain connected to the power supply output terminal, and its gate connected to the fourth contact terminal.

7. The power detection and shutdown circuit according to claim 5, characterized in that, The switching transistor is a bipolar junction transistor (BJT). The emitter of the BJT is connected to the power supply input terminal, the base of the BJT is connected to the power supply output terminal, and the collector of the BJT is connected to the fourth contact terminal.

8. The power detection and shutdown circuit according to claim 5, characterized in that, The switching module further includes a first voltage divider element and a second voltage divider element. The power supply input terminal is connected to the fourth contact terminal in sequence through the first voltage divider element and the second voltage divider element. The common connection terminal between the first voltage divider element and the second voltage divider element is connected to the control electrode of the switching transistor.

9. The power detection and shutdown circuit according to claim 8, characterized in that, Both the first voltage divider element and the second voltage divider element are resistive elements.

10. A power supply base, characterized in that, Includes the power detection and shutdown circuit as described in any one of claims 1 to 9.

11. A power receiving device, characterized in that, For use with the power supply base of claim 10, the power supply base being used to supply power to the powered device by means of the power detection and shutdown circuit.

12. The power receiving equipment according to claim 11, characterized in that, The power receiving device is fixed to the power supply base by magnetic attraction.

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