Control circuit, printed circuit board and equipment for realizing remote wireless switch

Abstract

The utility model belongs to the technical field of wireless control circuits, and particularly relates to a control circuit, a printed circuit board and equipment for realizing remote wireless switching, and the circuit comprises a wireless transmission and micro-control unit, an antenna, an impedance matching unit, a crystal oscillator, a capacitor unit, a power supply unit, a first input unit, a second input unit and a third input unit. The power supply unit is connected to a power supply terminal and a radio frequency power supply terminal of the wireless transmission and micro-control unit, and is also connected to the ground through the capacitor unit; the antenna is connected to a radio frequency signal terminal of the wireless transmission and micro-control unit through the impedance matching unit; the crystal oscillator is connected between a clock input terminal and a clock output terminal of the wireless transmission and micro-control unit; the first input unit, the second input unit and the third input unit are respectively connected to the first voltage input terminal, the second voltage input terminal and the third voltage input terminal of the wireless transmission and micro-control unit. According to the utility model, the stability, reliability and expandability of the wireless switch can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless control circuits, in particular to a control circuit, a printed circuit board and a device for realizing a remote wireless switch. Background Art

[0002] With the rapid development of science and technology, wireless communication technology has been widely used in various fields, bringing great convenience to people's lives. In the fields of smart home, industrial automation, remote monitoring, etc., wireless switches, as a flexible and convenient control method, have received widespread attention and application.

[0003] However, traditional wireless switches still have certain limitations in terms of communication stability, reliability, and scalability, and are difficult to meet complex and changing application requirements.

[0004] Therefore, a control circuit, a printed circuit board and a device for implementing a remote wireless switch are needed to improve the stability, reliability and scalability of the wireless switch. Utility Model Content

[0005] In order to solve the problems that traditional wireless switch communications are easily affected, have poor reliability, and are difficult to expand subsequently, the embodiments of the utility model provide a control circuit, a printed circuit board, and a device for realizing a remote wireless switch, which can improve the stability, reliability, and scalability of the wireless switch.

[0006] In the first aspect, an embodiment of the utility model provides a control circuit for realizing a remote wireless switch, the circuit comprising: a wireless transmission and micro control unit, an antenna, an impedance matching unit, a crystal oscillator, a capacitor unit, a power supply unit, a first input unit, a second input unit and a third input unit; the power supply unit is connected to the power terminal and the radio frequency power terminal of the wireless transmission and micro control unit; the power supply unit is also connected to the ground through the capacitor unit; the antenna is connected to the radio frequency signal terminal of the wireless transmission and micro control unit through the impedance matching unit; the crystal oscillator is connected between the clock input terminal of the wireless transmission and micro control unit and the clock output terminal of the wireless transmission and micro control unit; the first input unit, the second input unit and the third input unit are respectively connected to the first voltage input terminal, the second voltage input terminal and the third voltage input terminal of the wireless transmission and micro control unit.

[0007] Preferably, the capacitor unit includes a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected to form a parallel circuit, a first terminal of the parallel circuit is connected to the power supply unit, and a second terminal of the parallel circuit is connected to the ground.

[0008] Preferably, the impedance matching unit comprises a signal matching circuit, a first terminal of the signal matching circuit is connected to the antenna and the radio frequency signal terminal, and a second terminal of the signal matching circuit is connected to ground.

[0009] Preferably, the power supply unit is a battery.

[0010] Preferably, the first input unit, the second input unit and the third input unit are key switches; the key switch of the first input unit includes a first contact group and a second contact group, the first contact group is connected to the first voltage input terminal, and the second contact group is connected to the ground; the key switch of the second input unit includes a third contact group and a fourth contact group, the third contact group is connected to the second voltage input terminal, and the fourth contact group is connected to the ground; the key switch of the third input unit includes a fifth contact group and a sixth contact group, the fifth contact group is connected to the third voltage input terminal, and the sixth contact group is connected to the ground.

[0011] Preferably, the wireless transmission and microcontroller unit is an integrated control chip in which an MCU chip and a wireless transmission unit are sealed together.

[0012] Preferably, the circuit includes a first de-jitter unit, a second de-jitter unit and a third de-jitter unit, the first de-jitter unit is connected between the first input unit and the first voltage input terminal, the second de-jitter unit is connected between the second input unit and the second voltage input terminal, and the third de-jitter unit is connected between the third input unit or the third voltage input terminal; the first de-jitter unit includes a first resistor and a third capacitor, the first resistor is connected between the power supply unit and the first voltage input terminal, and the third capacitor is connected in parallel at both ends of the first input unit; the second de-jitter unit includes a second resistor and a fourth capacitor, the second resistor is connected between the power supply unit and the second voltage input terminal, and the fourth capacitor is connected in parallel at both ends of the second input unit; the third de-jitter unit includes a third resistor and a fifth capacitor, the third resistor is connected between the power supply unit and the third voltage input terminal, and the fifth capacitor is connected in parallel at both ends of the third input unit.

[0013] Preferably, the circuit includes a protection unit, which includes a gas discharge tube, a sixth capacitor and an electrostatic protection tube, the sixth capacitor is connected between the antenna and the radio frequency signal terminal, the first connection point between the sixth capacitor and the antenna is connected to one end of the gas discharge tube, and the other end of the gas discharge tube is grounded; the second connection point between the sixth capacitor and the radio frequency signal terminal is connected to one end of the electrostatic protection tube, and the other end of the electrostatic protection tube is grounded.

[0014] On the other hand, a printed circuit board is provided, comprising a control circuit for realizing a remote wireless switch as described in any one of the above items, wherein a power supply placement area, a general placement area and an input unit placement area are arranged in sequence on the top layer of the printed circuit board; the power supply placement area is used to place a power interface, and the power supply unit is detachably arranged on the power interface; the general placement area comprises a control chip placement area, an impedance matching unit placement area, a crystal oscillator placement area, a capacitor unit placement area, and an antenna placement area, which are respectively used to place the wireless transmission and micro control unit, the impedance matching unit, the crystal oscillator, the capacitor unit and the antenna; the input unit placement area comprises a first input unit placement area, a second input unit placement area and a third input unit placement area, which are respectively used to place the first input unit, the second input unit and the third input unit.

[0015] On the other hand, a wireless switch device is provided, the device comprising any of the circuits described above, or comprising the printed circuit board described above.

[0016] To sum up, the beneficial effects of the utility model are as follows: since the utility model adopts wireless transmission and a microcontroller unit, it can be used to realize the wireless remote control function, which is beneficial to provide users with a more convenient operation experience; by optimizing the power supply design, the power supply unit is grounded through the capacitor unit, which effectively filters out the power supply noise and improves the stability and reliability of the circuit; in addition, the antenna is connected to the RF signal terminal of the chip through an impedance matching unit, and the impedance matching unit reduces the signal loss during transmission and improves the communication quality; the application of the crystal oscillator ensures the accuracy of the chip clock and further improves the stability and reliability of the communication; the circuit also has a multi-input unit design, which can receive multiple signal inputs. The combination of multiple input signals makes the expansion of functions possible, provides convenience for product upgrades, and is conducive to meeting the needs of different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings required for use in the embodiment of the utility model will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the utility model.

[0018] Figure 1 It is a schematic diagram of the connection mode of the control circuit for realizing the remote wireless switch in the embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the circuit principle of the capacitor unit of the embodiment of the utility model.

[0020] Figure 3It is a schematic diagram of the circuit principle of the impedance matching unit of the embodiment of the utility model.

[0021] Figure 4 It is a schematic diagram of the circuit principle of the power supply unit of the embodiment of the utility model.

[0022] Figure 5 It is a schematic diagram of the circuit principle of the wireless transmission and microcontroller unit, crystal oscillator, antenna, etc. of the embodiment of the utility model.

[0023] Figure 6 It is a schematic diagram of the circuit principles of the first input unit, the second input unit and the third input unit of an embodiment of the utility model.

[0024] Figure 7 It is a schematic structural diagram of a printed circuit board according to an embodiment of the utility model.

[0025] Figure 8 It is a schematic diagram of a wireless switch device according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0028] Example 1

[0029] like Figure 1As shown, an embodiment of the utility model provides a control circuit for realizing a remote wireless switch, and the method can be used in various scenarios such as home remote control and industrial control.

[0030] The control circuit 100 for implementing a remote wireless switch includes:

[0031] The wireless transmission and micro control unit 110 , the antenna 120 , the impedance matching unit 130 , the crystal oscillator 160 , the capacitor unit 150 , the power supply unit 140 , the first input unit 170 , the second input unit 180 and the third input unit 190 .

[0032] The wireless transmission and microcontroller unit 110 may be any chip that uses wireless transmission technology to achieve data transmission, including a radio frequency chip, which may include various types, such as a transceiver radio frequency chip, a single-transmitter radio frequency chip, an active RFID single-transmitter radio frequency chip, etc. The wireless transmission and microcontroller unit 110 may be used to modulate a digital signal into a radio frequency signal for wireless transmission, or to demodulate a received radio frequency signal into a digital signal. Figure 2 As shown, the wireless transmission and micro control unit 110 includes a power terminal VDD, a radio frequency power terminal RF_VDD, a radio frequency signal terminal ANT, a clock input terminal XTALI, a clock output terminal XTALO, a first voltage input terminal K1_IN, a second voltage input terminal K2_IN and a third voltage input terminal K3_IN, etc.

[0033] Preferably, the wireless transmission and micro control unit 110 may be an integrated control chip U1 in which an MCU chip and an RF wireless transmission unit are co-sealed. In the control circuit for realizing a remote wireless switch, the use of an integrated control chip in which an MCU chip and a wireless transmission unit are co-sealed not only helps to reduce the volume of the circuit board, but also simplifies the production process and improves production efficiency. The model of the wireless transmission and micro control unit 110 may be MC2412A2K.

[0034] The antenna 120 may be a circular polarization antenna, a linear polarization antenna, etc. In terms of implementation, the antenna 120 may be a coil antenna, a patch antenna, a sheet antenna, a PCB antenna, etc. The antenna 120 may be used to receive and transmit wireless signals.

[0035] The impedance matching unit 130 is a circuit or device for achieving impedance matching between a signal source (antenna) and a load (wireless transmission and microcontroller unit). The impedance matching unit 130 can reduce reflection and loss of signals during transmission, thereby improving signal transmission efficiency. The impedance matching unit 130 can include at least one of an L-type matching network and a π-type matching network. In some embodiments, Figure 3As shown, the impedance matching unit includes a signal matching circuit, for example, a potentiometer RW1, the first terminal of the potentiometer RW1 is connected to the antenna and the RF signal terminal, and the second terminal of the potentiometer is connected to the ground GND. Through the potentiometer, the load impedance can be matched with the internal resistance of the excitation source, thereby reducing energy loss and improving the efficiency of the overall circuit; as an impedance matching unit, the potentiometer can adjust the impedance within a certain range to adapt to the working requirements at different frequencies, which enables the circuit to maintain stable performance in a wider frequency range.

[0036] The antenna 120 is connected to the radio frequency signal terminal of the wireless transmission and micro control unit 110 through the impedance matching unit 130 .

[0037] In some embodiments, the control circuit 100 for implementing a remote wireless switch also includes a protection unit, which is a component or circuit used to protect the antenna and circuit from lightning, static electricity, etc. The protection unit includes a gas discharge tube (GDT), a sixth capacitor and an electrostatic protection tube (ESD), the sixth capacitor is connected between the antenna and the RF signal terminal, the first connection point between the sixth capacitor and the antenna is connected to one end of the gas discharge tube, and the other end of the gas discharge tube is grounded; the second connection point between the sixth capacitor and the RF signal terminal is connected to one end of the electrostatic protection tube, and the other end of the electrostatic protection tube is grounded. The gas discharge tube can be a GDT ceramic gas discharge tube, etc. The electrostatic protection tube (ESD) can include at least one of a TVS diode, a diode array, etc.

[0038] The utility model introduces a protection unit, and the gas discharge tube in the protection unit plays the role of overvoltage protection and overcurrent protection. When the voltage or current in the circuit exceeds the set value, the gas discharge tube will be turned on to discharge the excess voltage or current to the ground, thereby preventing the components in the circuit from being damaged due to overvoltage or overcurrent; the sixth capacitor can filter out high-frequency noise in the circuit to ensure the stability of signal transmission; the electrostatic protection tube can quickly respond to electrostatic discharge events and discharge electrostatic energy to the ground, thereby protecting other components in the circuit from electrostatic damage.

[0039] The power supply unit 140 can be used to provide a DC power supply for wireless transmission and the microcontroller unit 110 or other components, and can include at least one of an external power supply (such as a battery or a DC voltage input converted by an adapter, etc.), an LDO device, etc. In some embodiments, the power supply unit is a battery, such as a button battery with a nominal voltage of 3.3V, such as Figure 4 As shown, the button battery BAT+ provides a 3.3V DC voltage to the outside. The button battery has the characteristics of small size and light weight, which can make the entire wireless switch circuit more compact and portable, and provide convenience for the wireless control application of the wireless switch circuit in smart homes and industrial equipment.

[0040] The power supply unit 140 is connected to the power supply terminal and the radio frequency power supply terminal of the wireless transmission and micro control unit 110 ; the power supply unit 140 is also connected to the ground through the capacitor unit 150 .

[0041] The capacitor unit 150 can be used to filter ripples for the power supply 140 and can include any type of electrolytic capacitor, ceramic capacitor, etc.

[0042] In some embodiments, Figure 5 As shown, the capacitor unit includes a first capacitor C2 and a second capacitor C3. The first capacitor C2 and the second capacitor C3 can be connected to form a parallel circuit, the first terminal of the parallel circuit is connected to the power supply unit, and the second terminal of the parallel circuit is connected to the ground. Capacitors connected in parallel can increase the capacity of the circuit, reduce the impedance of the circuit, and thus reduce the interference of the circuit and improve the stability and reliability of the circuit.

[0043] The crystal oscillator 160 may be any type, such as an active crystal oscillator, a passive crystal oscillator, a temperature-compensated crystal oscillator, a voltage-controlled crystal oscillator, etc., and may be used to provide a stable clock signal for wireless transmission and the micro control unit 110 .

[0044] like Figure 2 As shown, the passive crystal oscillator X1 is connected between a clock input terminal of the wireless transmission and micro control unit 110 and a clock output terminal of the wireless transmission and micro control unit 110 .

[0045] The first input unit 170, the second input unit 180, and the third input unit 190 can be used to input a specified signal to the wireless transmission and micro control unit 110. For example, when the user of the wireless switch operates the first input unit 170, the second input unit 180, and the third input unit 190, the operated input unit generates a corresponding electrical signal and transmits it to the wireless transmission and micro control unit 110, and generates a corresponding radio frequency signal according to the internal logic of the wireless transmission and micro control unit 110, so as to realize the remote control of smart home or industrial equipment in a wireless manner. The first input unit 170, the second input unit 180, and the third input unit 190 may include any type of physical buttons that can generate voltage signals, rotary potentiometers or encoders, analog joysticks, digital joysticks, etc.

[0046] The first input unit 170, the second input unit 180 and the third input unit 190 are connected to the first voltage input terminal, the second voltage input terminal and the third voltage input terminal of the wireless transmission and micro control unit 110 respectively. Figure 6As shown, the first input unit, the second input unit and the third input unit are key switches; the key switch K1 of the first input unit includes a first contact group (contacts 1 and 3) and a second contact group (contacts 2 and 4), the first contact group is connected to the first voltage input terminal, and the second contact group is connected to the ground; the key switch of the second input unit K2 includes a third contact group and a fourth contact group, the third contact group is connected to the second voltage input terminal, and the fourth contact group is connected to the ground; the key switch of the third input unit K3 includes a fifth contact group and a sixth contact group, the fifth contact group is connected to the third voltage input terminal, and the sixth contact group is connected to the ground.

[0047] In some embodiments, the first input unit, the second input unit and the third input unit are keys. The control circuit 100 for implementing a remote wireless switch further includes a first de-jitter unit, a second de-jitter unit and a third de-jitter unit for de-jittering the corresponding keys to avoid voltage jitter at the moment when the keys are closed and opened.

[0048] The first de-jitter unit is connected between the first input unit and the first voltage input terminal, the second de-jitter unit is connected between the second input unit and the second voltage input terminal, and the third de-jitter unit is connected between the third input unit and the third voltage input terminal.

[0049] The first debouncing unit includes a first resistor and a third capacitor, the first resistor is connected between the power supply unit and the first voltage input terminal, and the third capacitor is connected in parallel to both ends of the first input unit. When the first input unit is a key switch, one end of the third capacitor is connected to the first contact group, and the other end of the third capacitor is connected to the second contact group.

[0050] The second debouncing unit includes a second resistor and a fourth capacitor, the second resistor is connected between the power supply unit and the second voltage input terminal, and the fourth capacitor is connected in parallel to both ends of the second input unit. When the second input unit is a key switch, one end of the fourth capacitor is connected to the third contact group, and the other end of the fourth capacitor is connected to the fourth contact group.

[0051] The third debouncing unit includes a third resistor and a fifth capacitor, the third resistor is connected between the power supply unit and the third voltage input terminal, and the fifth capacitor is connected in parallel to both ends of the third input unit. When the third input unit is a key switch, one end of the fifth capacitor is connected to the fifth contact group, and the other end of the fifth capacitor is connected to the sixth contact group.

[0052] The utility model introduces a first debouncing unit, a second debouncing unit and a third debouncing unit, which perform debouncing processing on corresponding keys, thereby avoiding voltage jitter generated at the moment when the keys are closed and opened, and can significantly reduce the false touch rate of the keys during rapid or continuous operation, thereby ensuring accurate judgment of the switch state, improving the stability and reliability of the control system, and reducing operational errors caused by misjudgment.

[0053] The utility model adopts wireless transmission and a microcontroller unit, so it can be used to realize a wireless remote control function, which is beneficial to provide users with a more convenient operation experience; by optimizing the power supply design, the power supply unit is grounded through a capacitor unit, which effectively filters out power supply noise and improves the stability and reliability of the circuit; in addition, the antenna is connected to the RF signal terminal of the chip through an impedance matching unit, which reduces the signal loss during transmission and improves the communication quality; the application of the crystal oscillator ensures the accuracy of the chip clock and further improves the stability and reliability of the communication; the circuit also has a multi-input unit design, which can receive multiple signal inputs, and the combination of multiple input signals makes it possible to expand the function, provides convenience for product upgrades, and is beneficial to meeting the needs of different application scenarios.

[0054] Example 2

[0055] Figure 7 The connection structure diagram of the printed circuit board provided by the embodiment of the utility model is shown. The printed circuit board includes the control circuit for realizing the remote wireless switch as described in some embodiments of the embodiment 1.

[0056] like Figure 7 As shown, the top layer of the printed circuit board is provided with a power supply placement area 710, a general placement area 720 and an input unit placement area 730 arranged in sequence;

[0057] The power placement area 710 is used to place a power interface, and the power unit is detachably disposed on the power interface.

[0058] The general placement area 720 includes a control chip placement area, an impedance matching unit placement area, a crystal oscillator placement area, a capacitor unit placement area, and an antenna placement area, which are respectively used to place the wireless transmission and micro control unit, the impedance matching unit, the crystal oscillator, the capacitor unit, and the antenna.

[0059] The input unit placement area 730 includes a first input unit placement area, a second input unit placement area, and a third input unit placement area, which are used to place the first input unit, the second input unit, and the third input unit, respectively.

[0060] For more information about each unit, module or component, please refer to the relevant description in Example 1.

[0061] The printed circuit board provided by the embodiment of the utility model divides the top layer of the circuit board into a power placement area, a general placement area and an input unit placement area, so that different types of components are relatively concentrated in physical positions, which is convenient for component placement during production and subsequent maintenance operations, and each area is used to place components of a specific type, so that the space of the entire circuit board is efficiently utilized. This partitioning avoids space waste between components and makes the entire circuit board more compact; in each placement area, similar components are relatively concentrated, which helps to reduce the length of the connection between components, which is not only beneficial to reducing the space occupied on the circuit board, but also helps to reduce the loss of signal transmission and improve the performance of the circuit; by separating the power placement area from other functional areas, on the one hand, it helps to reduce the interference of power supply noise on other components and improve the electromagnetic compatibility of the entire circuit, and on the other hand, it can keep a certain distance from other components and reduce the impact of heat on other components.

[0062] Example 3

[0063] Figure 8 The schematic diagram of the wireless switch device provided by the embodiment of the utility model is shown. The wireless switch device includes the control circuit for realizing remote wireless switch as described in some embodiments of embodiment 1, or includes the printed circuit board as described in embodiment 2.

[0064] like Figure 8 As shown, the outside of the wireless switch device is provided with a battery cover 810 and a key 1 820, a key 2 830 and a key 3 840 arranged in sequence.

[0065] The internal area of ​​the device covered by the battery cover 810 is provided with a power interface, a button battery can be detachably installed, and the key 1 820, key 2 830 and key 3 840 correspond to the first input unit, the second input unit and the third input unit respectively. Other components of the circuit or the printed circuit board are arranged inside the wireless switch device.

[0066] For more information about each unit, module, component, and printed circuit board, please refer to the relevant description in Example 1 or Example 2.

[0067] It should be clear that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of simplicity, a detailed description of the known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0068] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present utility model are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0069] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0070] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention.

Claims

1. A control circuit for realizing a remote wireless switch, characterized in that: The circuit comprises: Wireless transmission and micro control unit, antenna, impedance matching unit, crystal oscillator, capacitor unit, power supply unit, first input unit, second input unit and third input unit; The power supply unit is connected to the power supply terminal and the radio frequency power supply terminal of the wireless transmission and micro control unit; the power supply unit is also connected to the ground through the capacitor unit; The antenna is connected to the radio frequency signal terminal of the wireless transmission and micro control unit through the impedance matching unit; The crystal oscillator is connected between a clock input terminal of the wireless transmission and micro control unit and a clock output terminal of the wireless transmission and micro control unit; The first input unit, the second input unit and the third input unit are respectively connected to a first voltage input terminal, a second voltage input terminal and a third voltage input terminal of the wireless transmission and micro control unit.

2. The circuit according to claim 1, characterized in that The capacitor unit includes a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected to form a parallel circuit, a first terminal of the parallel circuit is connected to the power supply unit, and a second terminal of the parallel circuit is connected to the ground.

3. The circuit according to claim 1, characterized in that The impedance matching unit includes a signal matching circuit, a first terminal of the signal matching circuit is connected to the antenna and the radio frequency signal terminal, and a second terminal of the signal matching circuit is connected to the ground.

4. The circuit according to claim 1, characterized in that The power supply unit is a battery.

5. The circuit according to claim 1, characterized in that The first input unit, the second input unit, and the third input unit are key switches; The key switch of the first input unit includes a first contact group and a second contact group, the first contact group is connected to the first voltage input terminal, and the second contact group is connected to the ground; The key switch of the second input unit includes a third contact group and a fourth contact group, the third contact group is connected to the second voltage input terminal, and the fourth contact group is connected to the ground; The key switch of the third input unit includes a fifth contact group and a sixth contact group, the fifth contact group is connected to the third voltage input terminal, and the sixth contact group is connected to the ground.

6. The circuit according to claim 1, characterized in that The wireless transmission and micro control unit is an integrated control chip that is sealed with an MCU chip and a wireless transmission unit.

7. The circuit according to claim 1, characterized in that The types of the first input unit, the second input unit and the third input unit are keys; The circuit further includes a first de-jitter unit, a second de-jitter unit and a third de-jitter unit, wherein the first de-jitter unit is connected between the first input unit and the first voltage input terminal, the second de-jitter unit is connected between the second input unit and the second voltage input terminal, and the third de-jitter unit is connected between the third input unit and the third voltage input terminal; The first de-jitter unit includes a first resistor and a third capacitor, the first resistor is connected between the power supply unit and the first voltage input terminal, and the third capacitor is connected in parallel to both ends of the first input unit; The second de-jitter unit includes a second resistor and a fourth capacitor, the second resistor is connected between the power supply unit and the second voltage input terminal, and the fourth capacitor is connected in parallel to both ends of the second input unit; The third de-jitter unit includes a third resistor and a fifth capacitor, the third resistor is connected between the power supply unit and the third voltage input terminal, and the fifth capacitor is connected in parallel to both ends of the third input unit.

8. The circuit according to any one of claims 1 to 6, characterized in that: The circuit further includes a protection unit, which includes a gas discharge tube, a sixth capacitor and an electrostatic protection tube. The sixth capacitor is connected between the antenna and the RF signal terminal. The first connection point between the sixth capacitor and the antenna is connected to one end of the gas discharge tube, and the other end of the gas discharge tube is grounded; A second connection point between the sixth capacitor and the radio frequency signal terminal is connected to one end of the electrostatic protection tube, and the other end of the electrostatic protection tube is grounded.

9. A printed circuit board, characterized in that: The printed circuit board comprises a control circuit for realizing a remote wireless switch as claimed in any one of claims 1 to 6, and a top layer of the printed circuit board is provided with a power supply placement area, a general placement area and an input unit placement area arranged in sequence; The power supply placement area is used to place a power supply interface, and the power supply unit is detachably arranged on the power supply interface; The general placement area includes a control chip placement area, an impedance matching unit placement area, a crystal oscillator placement area, a capacitor unit placement area, and an antenna placement area, which are respectively used to place the wireless transmission and micro control unit, the impedance matching unit, the crystal oscillator, the capacitor unit, and the antenna; The input unit placement area includes a first input unit placement area, a second input unit placement area and a third input unit placement area, which are used to place the first input unit, the second input unit and the third input unit respectively.

10. A wireless switch device, characterized in that: The device comprises a circuit as claimed in any one of claims 1 to 8, or comprises a printed circuit board as claimed in claim 9.

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