Smart home equipment based on ZigBee

Abstract

The utility model discloses intelligent household equipment based on ZigBee, which belongs to the field of Internet of Things, in the intelligent household equipment, a signal needing to be sent is amplified by a power amplifier chip and then is transmitted to an antenna of a change-over switch module, so as to complete the emission of the signal; when the antenna receives a signal and then transmits the signal to the ZigBee chip, the ZigBee chip controls the change-over switch to switch the antenna according to the intensity of the signal, so that the input antenna is the antenna with the best current signal intensity. The problems of low signal transmitting power and weak wall penetrating capability of micro-power intelligent equipment are solved through the power amplifier chip; by arranging a plurality of antennas, the problems of instability and unreliability caused by signal transmission depending on only one antenna are solved.

Description

Technical Field

[0001] The utility model belongs to the field of Internet of Things, and in particular relates to a ZigBee-based smart home device. Background Art

[0002] like Figure 3 As shown, the current size of smart switches and smart sockets is mostly 86*86cm. The antennas of most smart devices are installed on the bottom shell or panel 1, and the metal sheet metal 3 used to support the device supports and fixes the smart device. When the antenna is installed on the bottom shell, since the wall-embedded part 2 of the smart device needs to be embedded in the wall, the wall-embedded part 2 will attenuate the signal on the antenna. At the same time, the power supply of the smart device will also interfere with the antenna signal, which is prone to frequent disconnection and unstable signal. When the antenna is installed on the panel 1, the front signal is better, but it will cause the problem of poor signal on the back of the smart device body. At the same time, most of the existing smart devices based on ZigBee communication are micro-power solutions, that is, EIRP < 10dBm. The micro-power solution has low transmission power, low receiving sensitivity, weak wall penetration ability and is easily affected by other 2.4G wireless signals, which will also affect the communication effect of the smart device.

[0003] In summary, existing micro-power smart devices have unstable and unreliable communication performance because they rely on only one antenna for communication. Utility Model Content

[0004] The utility model aims to provide a ZigBee-based smart home device to solve the technical problem that low-power smart devices in the prior art rely on only one antenna for communication, resulting in unstable and unreliable communication performance.

[0005] To achieve the above purpose, the technical solution of ZigBee-based smart home equipment provided by the utility model is:

[0006] A ZigBee-based smart home device comprises an antenna for transmitting and receiving ZigBee signals and a ZigBee chip for controlling according to the transmitted and received ZigBee signals. The device comprises at least two antennas and a switching switch module connected to each antenna to switch different antennas for use. The switching switch module comprises an input terminal for receiving a signal to be transmitted, a control terminal connected to the ZigBee chip and at least two output terminals connected to each antenna. The ZigBee chip is used to control the switching switch module to switch antennas according to the strength of antenna signals received from the antennas.

[0007] As a further improvement, there are two antennas, namely a PCB antenna and an FPC antenna, and the transmitting and receiving directions of the PCB antenna and the FPC antenna are opposite.

[0008] As a further improvement, a power amplifier chip is also included, and the power amplifier chip includes an input end for receiving a signal to be transmitted and an output end connected to the input end of the switching module.

[0009] As a further improvement, a first filter circuit for eliminating high-order harmonics is provided between the output end of the power amplifier chip and the input end of the switching module.

[0010] As a further improvement, the first filtering circuit adopts an LC circuit.

[0011] As a further improvement, the power amplifier chip includes a control terminal connected to the ZigBee chip, so that the ZigBee chip can enable and control the power amplifier chip according to the signal to be transmitted.

[0012] The beneficial effect of the ZigBee-based smart home device of the utility model is that when the antenna receives a signal, it is transmitted to the ZigBee chip through the connection line between the switching switch module and the ZigBee chip. The ZigBee chip controls the switching switch to switch the antenna according to the strength of the signal, so that the antenna used is the antenna with the best current signal strength. By setting up multiple antennas, the problem of instability and unreliability of relying on only one antenna to transmit the signal is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the circuit structure of an embodiment of a ZigBee-based smart home device in the present utility model;

[0014] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of a ZigBee-based smart home device in the present utility model;

[0015] Figure 3 It is a structural schematic diagram of a prior art intelligent device;

[0016] Figure Number:

[0017] 1. Panel; 2. Wall-mounted part; 3. Metal sheet metal used to support the equipment. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is 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 used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] ZigBee-based smart home device implementation example:

[0020] like Figure 1 As shown, the ZigBee-based smart home device includes an antenna for transmitting and receiving ZigBee signals, a ZigBee chip, a power amplifier chip, and a switch module. The switch module uses a radio frequency switch.

[0021] The power amplifier chip includes an input end for receiving the signal to be transmitted, an output end connected to the input end of the switching module, and a control end connected to the ZigBee chip, so as to realize the enabling control of the power amplifier chip by the ZigBee chip according to the signal to be transmitted. The power amplifier chip is used to amplify the signal at the input end and transmit it to the input end of the switching module through the output end; by increasing the signal transmission power and improving its receiving sensitivity, it can offset the influence of some walls and metal devices, thereby ensuring the coverage of the wireless signal. The power amplifier chip uses the RFX2401C or AT2401C model chip.

[0022] The switch module includes an input terminal for receiving a signal to be transmitted, a control terminal connected to the ZigBee chip, and at least two output terminals connected to the antennas. The switch module transmits the signal at the output terminal through the antenna.

[0023] There are at least two antennas, preferably two antennas, namely a PCB antenna and an FPC antenna. The multiple antenna modules can be multiple antennas of the same type or multiple antennas of different types.

[0024] In order to improve the isolation of the antenna and make the signal-to-noise ratio of the received and transmitted signals better, the transmitting and receiving directions of the two antennas, the PCB antenna and the FPC antenna, are set in opposite directions. Preferably, one is set on the TOP layer of the PCB board signal layer, and the other is set on the Bottom layer of the PCB board signal layer. Preferably, the PCB antenna is set on the TOP layer of the PCB board signal layer, and the FPC antenna is set on the Bottom layer of the PCB board signal layer. Specifically, the Bottom layer is designed in the form of a coplanar waveguide and is connected to the PCB board-mounted antenna designed on the TOP layer through vias as link one, and the Bottom layer leads the FPC antenna to the bottom shell through the IPEX antenna seat as link two, and the switching of the two links is used to achieve the switching of the antenna input.

[0025] The ZigBee chip controls the switch module to switch the antenna according to the antenna signal strength received from the antenna. Generally, when the RSSI of the signal is less than -80dBm, the signal is considered weak and the antenna needs to be switched. If the signal strength received by the switched antenna is still very low, two or more antennas are compared to select the antenna with the strongest current signal for use. The ZigBee chip uses the NXP_JN5169 chip.

[0026] A first filter circuit for eliminating high-order harmonics is provided between the output end of the power amplifier chip and the input end of the switching module. The first filter circuit adopts an LC circuit. The inductance on the LC circuit includes Figure 1 L3, L4 on the LC circuit; the capacitors on the LC circuit include Figure 1 C21, C22, C23, C24 on.

[0027] A second filter circuit is connected in parallel to the power supply line of the power amplifier chip. The second filter circuit is composed of two capacitors connected in parallel. The two capacitors are Figure 1 C19 and C20.

[0028] Specifically, Figure 1 , Figure 2 As shown, the pins DIO2 and DIO3 on the ZigBee chip are respectively connected to the pins RXEN and TXEN on the power amplifier chip to realize the control connection of the ZigBee chip to the power amplifier chip; the pins ADC-DIO0 and ADC-DIO1 on the ZigBee chip are respectively connected to the pins V1 and V2 of the switching module to realize the connection between the ZigBee chip and the power amplifier chip. Figure 1 The E1Antenna on the top is a PCB antenna. Figure 1 The E2Antenna on the switch module is the FPC antenna. The pins RF1 and RF2 of the switch module are connected to the FPC antenna and the PCB antenna respectively; the ZigBee chip determines whether to switch the antenna according to the signal strength received by the current antenna, and sends a corresponding control signal to the switch module to control the switch module to switch the antenna. RF_PORT is the signal to be transmitted, which is amplified by the power amplifier chip and transmitted to the antenna of the switch module.

[0029] The transmission power of the smart device of the utility model is increased by about 6.4 times compared with the existing smart devices; the transmission power of this solution is 18dBm, and the transmission power of the existing solution is 10dBm, where 10dBm = 10mW, 18dBm = 64Mw. The communication distance between smart devices is increased by 1.7 times; the communication distance of this solution is about 850m, and the communication distance of the existing solution is about 500m.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A ZigBee-based smart home device, comprising an antenna for transmitting and receiving ZigBee signals and a ZigBee chip for controlling according to the transmitted and received ZigBee signals, characterized in that: There are at least two antennas, and a switching switch module connected to each antenna is included to switch different antennas into use; The switch module includes an input terminal for receiving a signal to be transmitted, a control terminal connected to the ZigBee chip, and at least two output terminals connected to each antenna; The ZigBee chip is used to control the switching module to switch the antenna according to the antenna signal strength received from the antenna.

2. The ZigBee-based smart home device according to claim 1, characterized in that: There are two antennas, namely a PCB antenna and an FPC antenna. The transmitting and receiving directions of the PCB antenna and the FPC antenna are opposite.

3. The ZigBee-based smart home device according to claim 1, characterized in that: It also includes a power amplifier chip, which includes an input end for receiving a signal to be transmitted and an output end connected to the input end of the switching module.

4. The ZigBee-based smart home device according to claim 3, characterized in that: A first filter circuit for eliminating high-order harmonics is arranged between the output end of the power amplifier chip and the input end of the switching module.

5. The ZigBee-based smart home device according to claim 4, characterized in that: The first filtering circuit adopts an LC circuit.

6. The ZigBee-based smart home device according to claim 3, characterized in that: The power amplifier chip includes a control terminal connected to the ZigBee chip, so as to realize the enabling control of the power amplifier chip by the ZigBee chip according to the signal to be transmitted.

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