CN216391433U

CN216391433U - ZigBee module

Info

Publication number: CN216391433U
Application number: CN202123257765.8U
Authority: CN
Inventors: 秦国华; 孙国良
Original assignee: Beike Technology Co Ltd
Current assignee: Beike Technology Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-04-26
Anticipated expiration: 2031-12-20

Abstract

The utility model provides a ZigBee module, comprising: the network matching unit comprises a first port, a second port, n inductors and n +1 capacitors, wherein the n inductors are connected between the first port and the second port in series, the first ends of the n +1 capacitors are connected to the ends of the n inductors, and the second ends of the n inductors are grounded, wherein n is an integer more than 2; an MCU unit including an RF module having a PA/LNA circuit in which a PA and an LNA are connected in parallel, the PA/LNA circuit being connected to the first port; and an antenna combining unit connected to the second port. The utility model can realize that the single ZigBee module can simultaneously meet the requirements of gateway products and sub-equipment products, thereby improving the applicability of the single ZigBee module.

Description

ZigBee module

Technical Field

The utility model relates to the field of smart homes, in particular to a ZigBee module.

Background

In the smart home market, the ZigBee wireless communication technology has been widely popularized by virtue of its advantages of low power consumption, low cost, large network capacity, safety, reliability, and the like. Through being applied to intelligent house field with zigBee wireless communication technology, can improve the convenience of house operation on the one hand, reduce the house cost, on the other hand can improve people's life and live and experience. In addition, the ZigBee wireless communication technology can also realize an effective signal anti-interference function, thereby creating convenience for people and simultaneously reducing signal interference to other users.

ZigBee devices are generally divided into gateway products and sub-device products. In order to meet the requirements of code stream control function and long communication distance, the gateway product needs to adopt a module with high transmission power and a hardware flow control function. Since the sub-device product does not have the above requirements, a module with low transmission power and no hardware current control function is used to save cost.

In the prior art, corresponding ZigBee modules can be separately designed according to the specific requirements of a gateway product and a sub-device product. Therefore, the type and the management cost of the ZigBee device are increased. Therefore, there is a need to optimize the structure of the existing ZigBee module to overcome the above disadvantages.

It is to be noted that the information disclosed in the background section above is only for enhancement of understanding of the background of the utility model and therefore it may contain information that does not constitute prior art that is already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a ZigBee module which can meet the requirements of more than two types of power transmission through flexible network configuration and power setting, thereby overcoming the problems in the prior art.

The present invention generally provides a ZigBee module, which mainly includes: the network matching unit comprises a first port, a second port, n inductors and n +1 capacitors, wherein the n inductors are connected between the first port and the second port in series, the first end of each capacitor in the n +1 capacitors is connected to each end of the n inductors, the second end of each capacitor is grounded, and n is an integer more than 2; an MCU unit including an RF module having a PA/LNA circuit formed by connecting a PA and an LNA in parallel, the PA/LNA circuit being connected to the first port; and an antenna combining unit connected to the second port.

According to an embodiment of the present invention, the n inductors may include: a first end of the first inductor is connected to the first port; and a second inductor, a first end of the second inductor being connected to the second port, and a second end of the second inductor being connected to a second end of the first inductor, the n +1 capacitors including: a first end of the first capacitor is connected to the first port and a first end of the first inductor, and a second end of the first capacitor is grounded; a first end of the second capacitor is connected to the second end of the first inductor and the second end of the second inductor, and the second end of the second capacitor is grounded; and a third capacitor, wherein a first end of the third capacitor is connected to the first end of the second inductor and the second port, and a second end of the third capacitor is grounded.

According to an embodiment of the present invention, the transmission power of the ZigBee module can be selectively set to 10dBm or 20 dBm.

According to an embodiment of the present invention, the antenna assembly unit may include a fourth-generation IPEX base connected to the second port and a copper pillar antenna disposed on the fourth-generation IPEX base.

According to an embodiment of the present invention, the MCU unit may further include a GPIO module, and the GPIO module is connected to the hardware flow control serial port unit to implement interaction between the MCU unit and the application processor.

According to an embodiment of the present invention, the GPIO module may further be connected to the clock unit and the three-way PWM unit, respectively.

According to an embodiment of the present invention, the clock unit may provide a 38.4MHZ clock signal to the MCU unit; the three-way PWM unit may include a three-way PWM circuit connected to the GPIO module and an LED indicator lamp connected to the three-way PWM circuit, so as to implement PWM signals of different frequencies and duty ratios by means of a timer circuit in the MCU unit, thereby driving the LED indicator lamp.

According to an embodiment of the present invention, the MCU unit may further include an ADC module, and the ADC module may be connected to a 12-bit ADC interface.

According to an embodiment of the present invention, the MCU unit may further include a power module, and the power module may be connected to a power supply circuit unit, and the power supply circuit unit supports a voltage input of 2V to 3.8V.

According to an embodiment of the present invention, the MCU unit may be embedded with an EFR32MG21 chip.

According to the utility model, the single ZigBee module can meet the requirements of gateway products and sub-equipment products, the applicability of the ZigBee module is improved, and the management cost is reduced.

Drawings

The above and other features of the present invention will be described in detail below with reference to certain exemplary embodiments thereof, which are illustrated in the accompanying drawings, and which are given by way of illustration only, and thus are not limiting of the utility model, wherein:

fig. 1 shows a block diagram of a ZigBee module according to an embodiment of the present invention.

Fig. 2 shows a circuit diagram of a network matching unit according to an embodiment of the utility model.

Description of the symbols

10 ZigBee module

1 MCU unit

2 network matching unit

3 antenna combined unit

4 power supply circuit unit

5 clock unit

6 three-way PWM unit

7 hardware flow control serial port unit

8 ADC unit

Detailed Description

The present invention is described in detail below with reference to specific examples so that those skilled in the art can easily practice the present invention based on the disclosure of the present specification. The embodiments described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by a person skilled in the art on the basis of the embodiments described in the present specification without inventive step are within the scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present specification may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

The ZigBee module of the utility model utilizes a flexible network matching Unit and combines with an RF (Radio Frequency) module in an MCU (micro controller Unit), thereby enabling the single ZigBee module to simultaneously meet the requirements of gateway products and sub-equipment products on different transmitting powers. Specifically, the ZigBee module of the present invention includes a network matching unit, an MCU unit connected to a first port of the network matching unit, and an antenna combining unit connected to a second port of the network matching unit. N (n is an integer of 2 or more) inductors are connected in series between the first port and the second port, a capacitor (n +1 in total) is connected to an end of each inductor, and the other end of each capacitor is grounded. Therefore, different transmitting Power configurations can be realized by conveniently adjusting the states of certain inductor and capacitor in the network matching unit and controlling the Power of the PA (Power Amplifier) by using software.

The ZigBee module 10 according to an embodiment of the utility model is described below with reference to fig. 1 and 2. Fig. 1 is a block diagram of a ZigBee module 10 according to an embodiment of the present invention. Fig. 2 is a circuit diagram of the network matching unit 2 in the ZigBee module 10.

As shown in fig. 1, the ZigBee module 10 of the present embodiment includes an MCU unit 1, a network matching unit 2 connected to the MCU unit 1, and an antenna combining unit 3 connected to the network matching unit 2, and the MCU unit 1 may include an RF module having a circuit (hereinafter, referred to as a PA/LNA circuit) in which a PA and an LNA (Low Noise Amplifier) are connected in parallel. Specifically, as shown in fig. 2, the PA/LNA circuit of the MCU unit 1 may be connected to the first port RF of the network matching unit 2_2G4The antenna combination unit 2 may be connected to a second port RF of the antenna combination unit 3_ANTIn the present embodiment, it is preferable to set the impedance to 50 Ω by the laminated structure and the track width pitch.

In addition, although not shown, those skilled in the art may know that the LNA of the reception path and the PA of the transmission path may be connected to the first port RF of the network matching unit 2 via a duplexer_2G4The diplexer can separate the two signals and prevent the relatively strong PA output from overloading the sensitive LNA input.

In the present embodiment, the network matching unit 2 is a two-stage network matching unit. In particular, as shown in fig. 2, the network matching unit 2 may comprise a serial connection to the first port RF_2G4And a second port RF_ANTA first inductor L1 and a second inductor L2 in between, and one end connected to the first port RF_2G4And a second port RF_ANTFirst C1, second C2 and third C3 capacitors in between. The first terminal of the first inductor L1 is connected to the first port RF_2G4The second inductor L2 is connected in series to the first inductor L1 and has a first end connected to the second port RF_ANTThe first end of the first capacitor C1 is connected to the first endOral RF_2G4And a first terminal of a first inductor L1, a first terminal of a second capacitor C2 is connected to the second terminal of the first inductor L1 and the second terminal of the second inductor L2, and a first terminal of a third capacitor C3 is connected to the first terminal of the second inductor L2 and the second port RF_ANTAnd the second terminals of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all grounded.

Through such a design, when the ZigBee module 10 is used in a gateway product, the network matching unit 2 can achieve a transmission power of 20 dBm. When the ZigBee module 10 is used in a sub-device product, in order to be compatible with the situation that the requirement on the transmission power in the sub-device product is not high, the PA power can be controlled by the RF module software in the MCU unit 1, the resistance of the second inductor L2 is adjusted to 0 Ω, and the third capacitor C3 is switched to the transmission power of 10dBm (without being attached to a patch). Therefore, the function of flexibly configuring the transmitting power is realized, the requirement of a gateway product with high transmitting power requirement can be met, and the requirement of a sub-equipment product with low transmitting power requirement can also be met.

It should be noted that, although in the present embodiment, the transmission power of 10dBm and 20dBm is realized by adopting, as the network matching unit 2, a two-stage network matching unit having two inductors connected in series and three capacitors connected in parallel with one end connected to the inductor and the other end grounded. However, the present invention is not limited thereto, and various transmission powers may be realized by using, for example, a three-stage network matching unit of three inductors connected in series and four capacitors connected in parallel with one end connected to the inductor and the other end grounded, as necessary. In the present invention, the mentioned inductance and capacitance constitute a matching circuit used as an impedance transformation.

In addition, as shown in fig. 1, the ZigBee module 10 of this embodiment may further include a power supply circuit unit 4, a clock unit 5, a three-way PWM unit 6, a hardware current control serial port unit 7, and an ADC (Analog-to-Digital Converter) unit 8. The MCU unit 1 may further include a GPIO (General-purpose input/output) module, an ADC module, and a POWER supply (POWER) module. In particular, the GPIO module may be connected to the clock unit 5. The clock unit 5 may preferably provide the MCU unit 1 with a high speed clock signal of 38.4 MHZ. In the present embodiment, the load capacitance of the clock unit 5 is preferably 10pF, and the ESR is 40 Ω at maximum. In addition, preferably, the GPIO module is also connected to the three-way PWM unit 6. The three-way PWM unit 6 includes a three-way PWM (PWM1, PWM2, PWM3) circuit and an LED indicator for implementing PWM signals of different frequencies and duty ratios by means of a timer circuit in the MCU unit 1, thereby directly driving the LED indicator. In this embodiment, it is particularly preferable that the GPIO module is connected to the hardware flow control serial port unit 7. The hardware flow control serial port unit 7 can enable the ZigBee module 10 to add a flow control function, thereby conveniently realizing interaction between the MCU unit 1 and an application processor (also referred to as an AP chip). Therefore, the requirement of a gateway product for having a hardware flow control function can be met, and when the gateway product is used for a sub-device product, the hardware flow control serial port unit 7 is omitted. Further, preferably, the ADC module is connected to the ADC unit 8. In this embodiment, the ADC unit 8 is an ADC interface (i.e. an interface for converting analog to digital), preferably a 12-bit ADC interface, and by connecting the ADC unit, monitoring of analog quantities such as battery voltage in a battery product can be conveniently achieved. In addition, the power supply module may be connected to the power supply circuit unit 4 and supplied with power by the power supply circuit unit 4. In the present embodiment, it is preferable that the power supply circuit unit 4 supports a wide-width voltage input of 2-3.8V.

As shown in fig. 1, the MCU unit 1 of the ZigBee module 10 of the present embodiment preferably has an EFR32MG21 chip built therein, so that the ZigBee/Thread protocol stack can be directly run, and the ZigBee/Thread module is particularly suitable for use in the field of lighting.

In addition, the antenna combination unit 3 of the present embodiment preferably includes a connection to the second port RF_ANTThe four-generation IPEX base and a copper column antenna arranged on the four-generation IPEX base. Because the copper cylinder antenna is low in price, the product cost can be reduced by adopting the copper cylinder antenna. The height of the fourth generation IPEX base is far lower than that of the first generation IPEX base, so that the height of the module matched with the antenna can be reduced on the whole.

In summary, according to the technical solution of the present invention, the following technical effects are provided:

(1) by providing two or more stages of network matching units having two or more inductors and three or more capacitors connected in a specific manner, the PA power can be appropriately controlled by software, and thus, requirements for different transmission powers such as 10dBm and 20dBm can be met. Therefore, the requirements of gateway products and sub-equipment products can be met simultaneously, the applicability of the ZigBee module is improved, and the management cost is reduced.

(2) The hardware flow control serial port unit connected with the GPIO module is arranged, so that the requirement of a gateway product on a hardware flow control function can be met, and the gateway product can be ignored when being used for a sub-device product. Therefore, the requirements of gateway products and sub-equipment products can be easily met.

(3) By arranging the ADC interface, the monitoring of analog quantities such as battery voltage in a product with a battery can be conveniently realized.

(4) By adopting the copper cylinder antenna in the antenna combination unit 8, the cost of the product can be reduced. By adopting the four-generation IPEX base in the antenna combination unit 8, the height of the module matched with the antenna can be reduced, and the miniaturization of a product is facilitated.

It is to be understood that the features listed above for the different embodiments may be combined with each other to form further embodiments within the scope of the utility model, where technically feasible. Furthermore, the particular examples and embodiments described herein are non-limiting, and various modifications of the structure, dimensions, and materials set forth above may be made without departing from the scope of the utility model.

In this application, the use of the conjunction of the contrary intention is intended to include the conjunction. The use of definite or indefinite articles is not intended to indicate cardinality. In particular, references to "the" object or "an" and "an" object are intended to mean one of many such objects possible. Furthermore, the conjunction "or" may be used to convey simultaneous features, rather than mutually exclusive schemes. In other words, the conjunction "or" should be understood to include "and/or". The term "comprising" is inclusive and has the same scope as "comprising".

The above-described embodiments, particularly any "preferred" embodiments, are possible examples of implementations, and are presented merely for a clear understanding of the principles of the utility model. Many variations and modifications may be made to the above-described embodiments without departing substantially from the spirit and principles of the technology described herein. All such modifications are intended to be included within the scope of this disclosure.

All documents mentioned in this specification are herein incorporated by reference as if each were incorporated by reference in its entirety.

Furthermore, it should be understood that various changes or modifications can be made by those skilled in the art after reading the above description of the present invention, and such equivalents also fall within the scope of the present invention.

Claims

1. A ZigBee module is characterized by comprising:

the network matching unit comprises a first port, a second port, n inductors and n +1 capacitors, wherein the n inductors are connected between the first port and the second port in series, the first end of each capacitor in the n +1 capacitors is connected to each end of the n inductors, the second end of each capacitor is grounded, and n is an integer more than 2;

the MCU unit comprises an RF module, the RF module is provided with a PA/LNA circuit formed by connecting a PA and an LNA in parallel, and the PA/LNA circuit is connected to the first port; and

an antenna combining unit connected to the second port.

2. The ZigBee module of claim 1, wherein the n inductors comprise:

a first end of the first inductor is connected to the first port; and

a second inductor having a first end connected to the second port and a second end connected to the second end of the first inductor,

the n +1 capacitors include:

a first end of the first capacitor is connected to the first port and a first end of the first inductor, and a second end of the first capacitor is grounded;

a first end of the second capacitor is connected to the second end of the first inductor and the second end of the second inductor, and the second end of the second capacitor is grounded; and

and the first end of the third capacitor is connected to the first end of the second inductor and the second port, and the second end of the third capacitor is grounded.

3. The ZigBee module according to claim 2, characterized in that the transmission power of the ZigBee module is selectively set to 10dBm or 20 dBm.

4. The ZigBee module according to any one of claims 1-3, wherein the antenna combination unit comprises a fourth generation IPEX base connected to the second port and a copper pillar antenna disposed on the fourth generation IPEX base.

5. The ZigBee module according to any one of claims 1-3, wherein the MCU unit further comprises a GPIO module, and the GPIO module is connected to the hardware flow control serial port unit to realize interaction between the MCU unit and the application processor.

6. The ZigBee module of claim 5, wherein the GPIO modules are further connected to a clock unit and a three-way PWM unit, respectively.

7. The ZigBee module of claim 6, wherein the clock unit provides a 38.4MHZ clock signal to the MCU unit;

the three-way PWM unit comprises a three-way PWM circuit connected with the GPIO module and an LED indicator lamp connected with the three-way PWM circuit, and PWM signals with different frequencies and duty ratios are realized by means of a timer circuit in the MCU unit, so that the LED indicator lamp is driven.

8. The ZigBee module of claim 5, wherein the MCU unit further comprises an ADC module, and the ADC module is connected to a 12-bit ADC interface.

9. The ZigBee module according to any one of claims 1-3, wherein the MCU unit further comprises a power supply module, the power supply module is connected to a power supply circuit unit, and the power supply circuit unit supports a voltage input of 2V-3.8V.

10. The ZigBee module according to any one of claims 1-3, wherein the MCU unit is built with an EFR32MG21 chip.