A switch panel and a control system of a switch panel

Abstract

The embodiment of the application discloses a kind of switch panel and the control system of switch panel, including at least one switch element and the control unit electrically connected with switch element;Switch element includes first input, second input and output, and one input in first input and second input receives the first power supply signal provided by external power supply;Control unit is used to obtain trigger signal, and according to trigger signal control switches the input of switch element, so that first input and output switch to second input and output conduction, or, so that second input and output switch to first input and output conduction.The technical scheme provided in the embodiment of the application improves the intelligentization of switch panel, and can automatically turn off power when forgetting to close, to avoid power waste.

Description

Technical Field

[0001] This invention relates to the field of switch panel technology, and more particularly to a switch panel and a control system for the switch panel. Background Technology

[0002] Lighting loads constitute a significant portion of a substation's electrical load. If, due to human negligence, the power is forgotten to be turned off, and the substation is unattended, it can take up to a month for personnel to inspect the equipment and shut off the power. This prolonged neglect of lighting loads results in substantial energy waste. Summary of the Invention

[0003] This invention provides a switch panel and a control system for the switch panel to improve the intelligence of the switch panel and automatically shut off the power when the switch is forgotten to be turned off, thus avoiding power waste.

[0004] In a first aspect, embodiments of the present invention provide a switch panel, including at least one switch element and a control unit electrically connected to the switch element;

[0005] The switching element includes a first input terminal, a second input terminal, and an output terminal, wherein one of the first input terminal and the second input terminal receives a first power supply signal provided by an external power supply.

[0006] The control unit is used to acquire a trigger signal and control the switching of the input terminal of the switching element according to the trigger signal, so that the first input terminal and the output terminal are switched to the second input terminal and the output terminal being switched, or the second input terminal and the output terminal are switched to the first input terminal and the output terminal being switched.

[0007] In a second aspect, embodiments of the present invention also provide a control system for a switch panel, including the switch panel as described in the first aspect, and a dual-control switch element and at least one load respectively electrically connected to the switch panel;

[0008] The dual-control switch element includes at least one sub-dual-control switch element. The first end of the sub-dual-control switch element is electrically connected to the first power supply terminal of the external power supply, the second end of the sub-dual-control switch element is electrically connected to the first input terminal of the switch element, and the third end of the sub-dual-control switch element is electrically connected to the second input terminal of the switch element.

[0009] The sub-dual-control switch element is used to provide the first power supply signal to the first input terminal of the switch element when the first terminal and the second terminal are connected, or to provide the first power supply signal to the second input terminal of the switch element when the first terminal and the third terminal are connected;

[0010] The first end of the load is electrically connected to the output end of the switching element, and the second end is electrically connected to the second power supply end of the external power supply.

[0011] The switch panel is also connected to the second power supply terminal of the external power supply.

[0012] The voltage at the first power supply terminal of the external power supply is greater than the voltage at the second power supply terminal.

[0013] The technical solution of this invention involves setting one of the first and second input terminals of a switching element to receive a first power supply signal from an external power source. When this input terminal and output terminal are connected, power can be supplied to the load, enabling the load to operate. Upon receiving a trigger signal, the control unit can control the switching element's input terminal to switch from the first input terminal and output terminal being connected to the second input terminal and output terminal being connected, or vice versa. This prevents the switching element's output terminal from outputting the first power supply signal, thereby cutting off the power supply path to the load. This allows for automatic power shut-off when the switch is forgotten, avoiding power waste and improving the intelligence of the switch panel.

[0014] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a switch panel provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of another switch panel structure provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of another switch panel provided in an embodiment of the present invention;

[0024] Figure 9 A schematic diagram of the control system for a switch panel provided in an embodiment of the present invention;

[0025] Figure 10 This is a schematic diagram of the control system circuit structure of a practical switch panel provided in an embodiment of the present invention. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] Figure 1 This is a schematic diagram of the structure of a switch panel provided in an embodiment of the present invention, as shown below. Figure 1As shown, the switch panel 100 includes at least one switch element 10 and a control unit 20 electrically connected to the switch element 10; the switch element 10 includes a first input terminal X1, a second input terminal X2 and an output terminal Y, and one of the first input terminals X1 and X2 receives a first power supply signal provided by an external power supply; the control unit 20 is used to acquire a trigger signal and control the switching of the input terminals of the switch element 10 according to the trigger signal, so that the first input terminal X1 and the output terminal Y are switched to the second input terminal X2 and the output terminal Y being switched, or the second input terminal X2 and the output terminal Y are switched to the first input terminal X1 and the output terminal Y being switched.

[0029] Understandably, switches are typically connected between an external power source (not shown in the figure) and a load (not shown in the figure). When the switching element 10 is in the ON state and the output terminal Y has a first power supply signal, the power supply signal from the external power source can be transmitted to the load, enabling the load to operate normally. For example, if the load is a light fixture, the light fixture will be in the lighting state at this time. However, for some lighting loads, if the user forgets to turn them off after completing their work, leaving the load in a working state for an extended period, it will result in significant energy waste.

[0030] Specifically, one of the first input terminals X1 and X2 of the switching element 10 is electrically connected to an external power supply to obtain a first power supply signal, which is then provided to the load through the output terminal. The other input terminal can be considered to be in a floating state, meaning it cannot provide a first power supply signal to the load. At this time, when a trigger signal is received, the control unit 20 can control the switching element 10 to switch from having the first input terminal X1 and output terminal Y connected to having the second input terminal X2 and output terminal Y connected, or vice versa, so that the input terminal of the switching element 10 changes from being connected to the external power supply to being in a floating state. Consequently, the output terminal Y of the switching element 10 does not output a first power supply signal, thus disconnecting the power supply to the load and achieving the purpose of saving electricity.

[0031] The trigger signal can be considered as the trigger signal that triggers the switching element 10 to switch from having a power supply signal output to having no power supply signal output. In this embodiment of the invention, the generation method of the trigger signal is not limited in any way, such as being generated by user control or being generated by internal control of the switch panel 100.

[0032] It should be noted that the present invention does not limit the specific number of switching elements 10. Multiple switching elements 10 are connected in parallel, and the loads connected to each switching element 10 are also connected in parallel. In this way, the switch panel 100 can control multiple parallel loads, which is more intelligent and saves power.

[0033] In this embodiment of the invention, by setting one of the first and second input terminals of the switching element to receive a first power supply signal from an external power supply, power can be supplied to the load when the input terminal and output terminal are connected, enabling the load to operate. The control unit can, upon receiving a trigger signal, control the switching element to switch the connection between the first and second input terminals and the output terminal, or vice versa, so that the output terminal of the switching element no longer outputs the first power supply signal, thereby cutting off the power supply path to the load. This allows for automatic power shut-off when the switch is forgotten, avoiding power waste and improving the intelligence of the switch panel.

[0034] Optional, Figure 2 This is a schematic diagram of another switch panel structure provided in an embodiment of the present invention, as shown below. Figure 2 As shown, the switch panel 100 includes a trigger power supply 30; the first end of the trigger power supply 30 is electrically connected to the output end of the switch element 10, and the second end is electrically connected to the control unit 20. The trigger power supply 30 is used to generate a trigger command and provide it to the control unit 20 when it receives a first power supply signal; the control unit 20 is used to generate a trigger signal according to a set rule when it receives the trigger command.

[0035] The trigger power supply 30 may include multiple sub-trigger power supplies. The first end of each sub-trigger power supply is electrically connected to the output terminal Y of a switching element 10, so as to generate a trigger command based on the first power supply signal output by each switching element 10 and provide it to the control unit 20, thereby realizing independent trigger control of each switching element 10 and making the switch panel more intelligent.

[0036] Optionally, the trigger power supply 30 may also include an optocoupler, which can provide isolation to prevent noise or high-frequency interference signals from affecting the stability and reliability of the switch panel 100.

[0037] Specifically, when the trigger power supply 30 receives the first power supply signal, it generates a trigger command and provides it to the control unit 20. The control unit 20 then performs further analysis and processing based on the received trigger command. Specifically, it processes and analyzes the data according to the preset rules of the control unit 20 to generate a trigger signal. Then, based on the trigger signal, it controls the switching element 10 to switch the input terminals of the switching element 10. This switches the first input terminal X1 and the output terminal Y to the second input terminal X2 and the output terminal Y, or switches the second input terminal X2 and the output terminal Y to the first input terminal X1 and the output terminal Y. As a result, the output terminal Y of the switching element 10 no longer outputs the first power supply signal, cutting off the power supply path to the load, thereby achieving the beneficial effect of saving electricity.

[0038] It should be noted that the setting rules of the control unit 20 include, but are not limited to, timing the working time of the load or statistically analyzing the power consumption of the load, and generating a trigger signal when the timing duration or power consumption meets a preset value. Those skilled in the art can use any setting rules to make the control unit 20 generate a trigger signal, and this embodiment of the invention does not impose any limitations on this. In addition, the setting rules of the control unit may also be different depending on the load electrically connected to different switching elements 10, and this embodiment of the invention does not impose specific limitations on this either. Those skilled in the art can selectively set the rules according to the actual situation.

[0039] Optional, Figure 3 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 3 As shown, the switch panel 100 includes an interactive unit 40 electrically connected to the control unit 20; the interactive unit 40 is used to configure preset parameters according to external instructions, and generate a trigger command to provide to the control unit 20 after completing the configuration of the preset parameters; the control unit 20 is used to generate a trigger signal according to the set rules when it receives the trigger command.

[0040] Understandably, the interaction unit 40 can provide a miniature touch screen for networking, timer settings, information viewing, time setting and display, etc. Users can set the time (e.g., date), power consumption, number of switching times, etc. of the switch panel 100 through the human-computer interaction unit 40, making the switch panel 100 more intelligent.

[0041] Specifically, users can control the switch panel and configure preset parameters through the interaction unit 40, so that the control unit 20 in the switch panel 100 can control it according to the configured preset parameters. For example, preset parameters include load power-off time or preset power. After the user completes the preset parameter configuration through the interaction unit 40, the interaction unit 40 will generate a trigger command and provide it to the control unit 20. When the control unit receives the trigger command, it generates a trigger signal according to the set rules, and then controls the switch element 10 according to the trigger signal to switch the input terminals of the switch element 10, so that the first input terminal X1 and the output terminal Y are connected, and the second input terminal X2 and the output terminal Y are connected, or the second input terminal X2 and the output terminal Y are connected, and the first input terminal X1 and the output terminal Y are connected. This causes the output terminal Y of the switch element 10 to no longer output the first power supply signal, cuts off the power supply path of the load, and achieves the beneficial effect of saving electricity.

[0042] Based on any of the above embodiments, optionally, Figure 4 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 4As shown, the control unit 20 includes a timing subunit 21; the timing subunit 21 is used to start timing after receiving a trigger command; the control unit 20 is used to generate a trigger signal when the timing duration of the timing subunit 21 is longer than a preset duration.

[0043] Specifically, the trigger command can be generated by the trigger power supply 30 or by the interaction unit 40; this embodiment of the invention does not limit this. For example, taking the trigger command being generated by the trigger power supply 30 as an example, when the timing subunit 21 in the control unit 20 receives the trigger command, it starts timing, that is, it times the working time of the load. When the timing duration exceeds a preset duration, the control unit 20 controls the input terminal of the switching element 10 to switch the first input terminal X1 and output terminal Y to the second input terminal X2 and output terminal Y, or to switch the second input terminal X2 and output terminal Y to the first input terminal X1 and output terminal Y, thereby disconnecting the power supply path to the load and achieving the beneficial effect of saving electricity.

[0044] The specific value of the preset duration can be selectively set according to actual conditions, and this embodiment does not limit it. It is understood that the preset duration can be an internal setting value of the control unit 20, or a value configured by the user through the interaction unit 40, and this embodiment does not specifically limit it.

[0045] Optional, Figure 5 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 5 As shown, the control unit 20 also includes a parameter detection subunit 22; the parameter detection subunit 22 is electrically connected to the interaction unit 40; the parameter detection subunit 22 is used to obtain the first operating parameter of the switch panel 100 after receiving a trigger command; the control unit 20 is used to generate a trigger signal when the first operating parameter is greater than a preset parameter.

[0046] Specifically, when the switch panel 100 provides the first power supply signal to the load to enable the load to work normally, the parameter detection subunit 22 can detect the first operating parameter of the switch panel 100 in real time, and the control unit 20 compares the first operating parameter with the preset parameter. When the first operating parameter is greater than the preset parameter, the control unit 20 generates a trigger signal to control the input terminal of the switching element 10, so that the switch panel 100 can no longer transmit the first power signal to the load, thereby disconnecting the power supply path of the load and achieving the purpose of saving electricity.

[0047] Optionally, the preset parameters include a preset power consumption, the specific value of which can be configured by the user through the interaction unit 40. This embodiment of the invention does not impose specific limitations on this. The first operating parameter includes the power consumption. The power consumption of the switch panel 100 is obtained by the parameter detection subunit 22, and the control unit 20 controls the switching of the input terminal of the switch element 10 according to the relationship between the power consumption and the preset power consumption, which can further improve the precise control and intelligence level of the switch panel 100.

[0048] Optional, Figure 6 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 6 As shown, the switch panel 100 includes an external command acquisition unit 50 electrically connected to the control unit 20; the external command acquisition unit 50 is used to acquire external command signals input by the user and generate trigger signals based on the external command signals and provide them to the control unit 20.

[0049] The external command acquisition unit includes, but is not limited to, manual control switches, buttons, knobs, or touch buttons on the switch panel 100.

[0050] Specifically, the user can manually operate the switch panel 100. When the external command acquisition unit 50 acquires the external command signal input by the user, it will generate a trigger signal and provide it to the control unit 20. When the control unit 20 acquires the trigger signal, it controls the switch element 10 to switch from the first input terminal X1 and output terminal Y to the second input terminal X2 and output terminal Y, or from the second input terminal X2 and output terminal Y to the first input terminal X1 and output terminal Y. This causes the input terminal of the switch element 10 to switch from being connected to the external power supply to a floating state, thereby causing the output terminal Y of the switch element 10 to have no first power supply signal output, thus disconnecting the power supply to the load and achieving the purpose of saving electricity.

[0051] Optional, Figure 7 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 7 As shown, the switch panel 100 includes a communication unit 60 electrically connected to the control unit 20; the communication unit 60 is used to communicate with a remote electronic device to generate a trigger signal according to a remote control command and provide it to the control unit 20.

[0052] The communication unit 60 can be wireless or wired communication. Wireless communication includes, but is not limited to, Bluetooth, cellular networks, or ZigBee. This embodiment of the invention does not specifically limit this.

[0053] Specifically, the switch panel 100 can communicate with remote electronic devices (such as mobile phones, tablets, or computers) through the communication unit 60, allowing users to directly control the switch panel 100 through the remote electronic devices. If the user forgets to turn off the load, they can send a remote control command to the communication unit 60 through the remote electronic device. Upon receiving the remote control command, the communication unit 60 generates a trigger signal and provides it to the control unit 20. The control unit 20 then controls the switch element 10 to switch from the first input terminal X1 and output terminal Y to the second input terminal X2 and output terminal Y, or from the second input terminal X2 and output terminal Y to the first input terminal X1 and output terminal Y. This results in no first power supply signal output at the output terminal Y of the switch element 10, thereby disconnecting the power supply to the load and achieving the purpose of saving electricity.

[0054] Optionally, in any of the above embodiments, the switching element 10 includes a relay switch, which has advantages such as high reliability, low power consumption, low cost and long service life.

[0055] Optional, Figure 8 This is a schematic diagram of another switch panel provided in an embodiment of the present invention, such as... Figure 8 As shown, the switch panel 100 also includes a power supply unit 70, which is electrically connected to the first input terminal X1 and the second input terminal X2 of the switch element, respectively. The power supply unit 70 processes the acquired first power supply signal to provide control power for the normal operation of the control unit 20. At the same time, the power supply unit 70 includes a voltage conversion subunit, which can realize the conversion of electrical signals, for example, converting the first power supply signal of 220V to the control power of 5V for the control unit 20.

[0056] Based on the same inventive concept, embodiments of the present invention also provide a control system for a switch panel. Figure 9 This is a schematic diagram of the control system for a switch panel provided in an embodiment of the present invention, as shown below. Figure 9As shown, the system includes the switch panel 100 as described in any of the above embodiments, and a dual-control switch element 200 and at least one load 300, both electrically connected to the switch panel 100. The dual-control switch element 200 includes at least one sub-dual-control switch element 201. The first end of the sub-dual-control switch element 201 is electrically connected to the first power supply terminal L of an external power supply, the second end of the sub-dual-control switch element 201 is electrically connected to the first input terminal X1 of the switch element 10, and the third end of the sub-dual-control switch element 201 is electrically connected to the second input terminal X2 of the switch element 10. The switching element 201 is used to provide a first power supply signal to the first input terminal X1 of the switching element 10 when the first terminal and the third terminal are connected, or to provide a first power supply signal to the second input terminal X2 of the switching element 10 when the second terminal and the third terminal are connected; the first terminal of the load 300 is electrically connected to the output terminal Y of the switching element 10, and the second terminal is electrically connected to the second power supply terminal N of the external power supply; the switch panel 100 is also electrically connected to the second power supply terminal N of the external power supply; wherein, the voltage of the first power supply terminal L of the external power supply is greater than the voltage of the second power supply terminal N.

[0057] Specifically, the first power supply terminal L of the external power supply can be a live wire, and the second power supply terminal N can be a neutral wire. At this time, the voltage of the first power supply terminal L is greater than the voltage of the second power supply terminal N. Through the sub-double-control switch element 201 in the double-control switch element 200, the first power supply signal can be selected to provide a first power supply signal to the first input terminal X1 or the second input terminal X2 of the switch element 10 in the switch panel 100. For example, when the first and third terminals of the sub-dual control switch element 201 are connected, the first input terminal X1 of the switch element 10 receives the first power supply signal, while the second input terminal X2 can be considered to be in a floating state. When the first input terminal X1 of the switch element 10 is connected to the output terminal Y, the switch element 10 can further transmit the first power supply signal to the load 300. The load is in a normal working state. When the control unit 20 in the switch panel 100 receives the trigger signal, it controls the switch element 10 to switch from the first input terminal X1 and the output terminal Y being connected to the second input terminal X2 and the output terminal Y being connected. This causes the input terminal of the switch element 10 to switch from the state of being connected to the first power supply terminal L of the external power supply to the floating state, thereby causing the output terminal Y of the switch element 10 to have no first power supply signal output, thus disconnecting the power supply to the load 300 and achieving the purpose of saving electricity.

[0058] To give a specific example, Figure 10 A schematic diagram of the control system circuit structure of a practical switch panel is provided for an embodiment of the present invention, as shown below. Figure 10 As shown.

[0059] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. 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 principles of this invention should be included within the scope of protection of this invention.

Claims

1. A switch panel, characterized in that, It includes at least one switching element and a control unit electrically connected to the switching element; The switching element includes a first input terminal, a second input terminal, and an output terminal. One of the first input terminal and the second input terminal receives a first power supply signal provided by an external power supply, and the other input terminal is in a floating state. The control unit is used to acquire a trigger signal and control the switching of the input terminal of the switching element according to the trigger signal, so that the first input terminal and the output terminal are switched to be connected to the second input terminal and the output terminal, so that the input terminal of the switching element is switched from being connected to an external power supply to a floating state, and the output terminal stops outputting the first power supply signal; or, the second input terminal and the output terminal are switched to be connected to the first input terminal and the output terminal, so that the input terminal of the switching element is switched from being connected to an external power supply to a floating state, and the output terminal stops outputting the first power supply signal. Including the trigger power supply; The first end of the trigger power supply is electrically connected to the output end of the switching element, and the second end is electrically connected to the control unit. The trigger power supply is used to generate a trigger command and provide it to the control unit when the first power supply signal is received. The control unit is used to generate the trigger signal according to a set rule when it receives the trigger command; The step of generating the trigger signal according to the set rules includes: A trigger signal is generated when the load's operating time or the load's power consumption meets a preset value.

2. The switch panel according to claim 1, characterized in that, Includes an interaction unit electrically connected to the control unit; The interaction unit is used to configure preset parameters according to external instructions, and generate a trigger command to provide to the control unit after completing the configuration of the preset parameters; The control unit is used to generate the trigger signal according to a set rule when it receives the trigger command.

3. The switch panel according to claim 1 or 2, characterized in that, The control unit includes a timing subunit; The timing subunit is used to start timing after receiving the trigger command; The control unit is used to generate the trigger signal when the timing duration of the timing subunit exceeds the preset duration.

4. The switch panel according to claim 2, characterized in that, The control unit also includes a parameter detection subunit; The parameter detection subunit is electrically connected to the interaction unit; The parameter detection subunit is used to obtain the first operating parameters of the switch panel after receiving the trigger command; The control unit is used to generate the trigger signal when the first operating parameter is greater than the preset parameter.

5. The switch panel according to claim 4, characterized in that, The preset parameters include preset power consumption, and the first operating parameter includes power consumption.

6. The switch panel according to claim 1, characterized in that, Includes an external command acquisition unit electrically connected to the control unit; The external instruction acquisition unit is used to acquire external instruction signals input by the user, and generate trigger signals based on the external instruction signals and provide them to the control unit.

7. The switch panel according to claim 1, characterized in that, Includes a communication unit electrically connected to the control unit; The communication unit is used to communicate with a remote electronic device to generate a trigger signal according to a remote control command and provide it to the control unit.

8. The switch panel according to claim 1, characterized in that, The switching element includes a relay switch.

9. A control system for a switch panel, characterized in that, Includes a switch panel as described in any one of claims 1-8, and a dual-control switch element and at least one load respectively electrically connected to the switch panel; The dual-control switch element includes at least one sub-dual-control switch element. The first end of the sub-dual-control switch element is electrically connected to the first power supply terminal of the external power supply, the second end of the sub-dual-control switch element is electrically connected to the first input terminal of the switch element, and the third end of the sub-dual-control switch element is electrically connected to the second input terminal of the switch element. The sub-dual-control switch element is used to provide the first power supply signal to the first input terminal of the switch element when the first terminal and the second terminal are connected, or to provide the first power supply signal to the second input terminal of the switch element when the first terminal and the third terminal are connected; The first end of the load is electrically connected to the output end of the switching element, and the second end is electrically connected to the second power supply end of the external power supply. The switch panel is also electrically connected to the second power supply terminal of the external power supply. The voltage at the first power supply terminal of the external power supply is greater than the voltage at the second power supply terminal.

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