CN216490485U - Bluetooth module - Google Patents
Bluetooth module Download PDFInfo
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- CN216490485U CN216490485U CN202121083943.7U CN202121083943U CN216490485U CN 216490485 U CN216490485 U CN 216490485U CN 202121083943 U CN202121083943 U CN 202121083943U CN 216490485 U CN216490485 U CN 216490485U
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Abstract
According to the Bluetooth module, the main control module, the power supply module, the storage module and the Bluetooth module are arranged, the Bluetooth module comprises the pi-shaped unit, the pi-shaped unit plays roles in receiving and transmitting Bluetooth signals and filtering, two grounding ends of the pi-shaped unit are grounded after being provided with the printed extension lines, the two printed extension lines are equivalent to two inductors, the filtering capability of the pi-shaped unit is enhanced, and the Bluetooth module can be well prevented from being influenced by external signal interference; meanwhile, as the two printed extension lines are equivalent to the two inductors, under the condition that the number of the electronic components forming the pi-shaped unit is not increased, the order of the pi-shaped unit is also increased, the integral filtering capability of the Bluetooth module is enhanced, and too much space of a PCB (printed circuit board) is not occupied.
Description
Technical Field
The utility model relates to the technical field of wireless transmission, in particular to a Bluetooth module.
Background
At present, the information technology is developed rapidly, and the wireless communication technology is seen everywhere in daily life. The wireless communication technology saves the limitation of a wired cable, and is convenient for people's terminal equipment to freely perform data interaction at any place. Bluetooth technology has been widely used as one of wireless communication technologies. The carrier of the bluetooth technology is electromagnetic wave, and the frequency spectrum of the electromagnetic wave is limited, so that the wireless communication products must be controlled to prevent the wireless communication products from interfering with each other.
The bluetooth module is invented based on bluetooth technology, and in order to prevent the bluetooth module from being interfered by other signals, the bluetooth module usually has a built-in radio frequency filter circuit to attenuate the interference signals. For the radio frequency filter circuit, a pi-type network is the most basic radio frequency filter circuit, the filtering capability of the pi-type radio frequency filter circuit is determined by the order, and the higher the order is, the stronger the filtering capability is. The order is in direct proportion to the number of electronic components of the pi-type radio frequency filter circuit, and the more the number of electronic components in the pi-type radio frequency filter circuit is, the higher the order is, the stronger the corresponding filtering capability is. However, if the number of electronic components of the pi-type rf filter circuit is increased, the manufacturing cost of the pi-type rf filter circuit is increased undoubtedly, that is, the manufacturing cost of the bluetooth module is increased, and meanwhile, the pi-type rf filter circuit with a high order also occupies too much PCB space.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide the Bluetooth module which has strong filtering capability, can well prevent the influence of external interference signals, has low manufacturing cost and does not occupy too much PCB space.
The purpose of the utility model is realized by the following technical scheme:
a bluetooth module, comprising:
a main control module;
the input end of the power supply module is used for being connected with external equipment, and the output end of the power supply module is connected with the main control module;
the storage module is connected with the output end of the power supply module; and
the Bluetooth module comprises a balun unit, a radio frequency voltage filtering unit and a pi-type unit, wherein the input end of the balun unit is connected with the output ends of the main control module and the radio frequency voltage filtering unit respectively, the input end of the radio frequency voltage filtering unit is connected with the output end of the power supply module, the pi-type unit is connected with the output end of the balun unit, and two grounding ends of the pi-type unit are grounded after being provided with a printed extension line.
In one embodiment, the balun unit includes a capacitor C32, a capacitor C36, a capacitor C31, an inductor L12, a capacitor C5, an inductor L10, and a capacitor C35, one end of the capacitor C32 and one end of the capacitor C36 are used as input ends of the balun unit, the other end of the capacitor C32 is connected to one end of the capacitor C31, the other end of the capacitor C31 is used as an output end of the balun unit, one end of the inductor L12 is connected to the other end of the capacitor C31, the other end of the inductor L12 is connected to the other end of the capacitor C36, one end of the capacitor C5 is connected to one end of the capacitor C32, the other end of the capacitor C5 is connected to the other end of the capacitor C36, one end of the inductor L10 is connected to the other end of the capacitor C32, the other end of the inductor L10 is grounded, one end of the capacitor C35 is connected to the other end of the capacitor C36, the other end of the capacitor C35 is grounded.
In one embodiment, the rf voltage filtering unit includes a resistor R24, an inductor L13, an inductor L14, a capacitor C42, and a capacitor C37, one end of the resistor R24 serves as an input end of the rf voltage filtering unit, the other end of the resistor R24 is connected to one end of the inductor L13 and one end of the inductor L14, the other end of the inductor L13 and the other end of the inductor L14 both serve as output ends of the rf voltage filtering unit, one end of the capacitor C42 is connected to one end of the inductor L13, the other end of the capacitor C42 is grounded, one end of the capacitor C37 is connected to one end of the inductor L14, and the other end of the capacitor C37 is grounded.
In one embodiment, the pi-type unit includes an inductor L1, a capacitor C1, and a capacitor C2, one end of the inductor L1 is connected to the output terminal of the balun unit, the other end of the inductor L1 is connected to the bluetooth antenna ANT, one end of the capacitor C1 is connected to one end of the inductor L1, the other end of the capacitor C1 is connected to one of the printed extension lines as one of the ground terminals of the pi-type unit and then grounded, one end of the capacitor C2 is connected to the other end of the inductor L1, and the other end of the capacitor C2 is connected to the other printed extension line as the other ground terminal of the pi-type unit and then grounded.
Compared with the prior art, the utility model at least has the following advantages and beneficial effects:
according to the Bluetooth module, the main control module, the power supply module, the storage module and the Bluetooth module are arranged, the Bluetooth module comprises the pi-shaped unit, the pi-shaped unit plays roles of receiving and transmitting Bluetooth signals and filtering, two grounding ends of the pi-shaped unit are grounded after being provided with the printed extension lines, the two printed extension lines are equivalent to two inductors, the filtering capability of the pi-shaped unit is enhanced, and the Bluetooth module can be well prevented from being influenced by external signal interference; meanwhile, as the two printed extension lines are equivalent to the two inductors, under the condition that the number of the electronic components forming the pi-shaped unit is not increased, the order of the pi-shaped unit is also increased, the integral filtering capability of the Bluetooth module is enhanced, and too much space of a PCB (printed circuit board) is not occupied.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic block diagram of a bluetooth module according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a Bluetooth module according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating transmission loss of a Bluetooth module before modification according to an embodiment of the present invention;
fig. 4 is a diagram illustrating an improved transmission loss of a bluetooth module according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a bluetooth module 10 includes a main control module 100, a power supply module 200, a storage module 300, and a bluetooth module 400.
Thus, it should be noted that the main control module 100 plays a role in signal transceiving and signal processing; the power supply module 200 plays a role of supplying power; the storage module 300 plays a role of storage; the bluetooth module 400 is used for transceiving bluetooth signals and filtering. Referring to fig. 1, an input end of the power supply module 200 is used for connecting with an external device, and an output end of the power supply module 200 is connected with the main control module 100.
Thus, it should be noted that the power supply module 200 plays a role of supplying power, and the power supply module 200 may be formed by a conventional voltage reduction chip commonly sold in the market.
Referring to fig. 1, the memory module 300 is connected to the output terminal of the power supply module 200.
Thus, it should be noted that the storage module 300 stores related program instructions of the bluetooth module 10, and is used in cooperation with the main control module 100.
Referring to fig. 1, the bluetooth module 400 includes a balun unit 410, a radio frequency voltage filtering unit 420, and a pi-type unit 430, wherein an input end of the balun unit 410 is connected to output ends of the main control module 100 and the radio frequency voltage filtering unit 420, an input end of the radio frequency voltage filtering unit 420 is connected to an output end of the power supply module 200, the pi-type unit 430 is connected to an output end of the balun unit 410, and two ground ends of the pi-type unit 430 are grounded after a printed extension line 431 is disposed.
Thus, it should be noted that the bluetooth module 400 includes the pi-type unit 430, the pi-type unit 430 plays roles of receiving, transmitting and filtering bluetooth signals, and since two grounding ends of the pi-type unit 430 are both provided with the printed extension lines 431 and then grounded, and the two printed extension lines 431 are equivalent to two inductors, the filtering capability of the pi-type unit 430 is enhanced, and the bluetooth module 10 can be well prevented from being influenced by external signal interference; meanwhile, as the two printed extension lines 431 are equivalent to the two inductors, under the condition that the number of the electronic components forming the pi-shaped unit 430 is not increased, the order of the pi-shaped unit 430 is also increased, the integral filtering capability of the Bluetooth module 10 is enhanced, and too much space of a PCB is not occupied.
Further, referring to fig. 2, in an embodiment, the balun unit 410 includes a capacitor C32, a capacitor C36, a capacitor C31, an inductor L12, a capacitor C5, an inductor L10, and a capacitor C35, one end of the capacitor C32 and one end of the capacitor C36 are both used as input ends of the balun unit 410, the other end of the capacitor C32 is connected to one end of the capacitor C31, the other end of the capacitor C31 is used as an output end of the balun unit 410, one end of the inductor L12 is connected to the other end of the capacitor C31, the other end of the inductor L12 is connected to the other end of the capacitor C36, one end of the capacitor C5 is connected to one end of the capacitor C32, the other end of the capacitor C5 is connected to the other end of the capacitor C36, one end of the inductor L10 is connected to the other end of the capacitor C32, the other end of the inductor L10 is grounded, one end of the capacitor C35 is connected to the other end of the capacitor C36, and the other end of the capacitor C35 is grounded.
In this way, the capacitor C32, the capacitor C36, the capacitor C31, the inductor L12, the capacitor C5, the inductor L10, and the capacitor C35 form a balun filter network, and perform filtering processing on the received and transmitted bluetooth signals.
Further, referring to fig. 2, in an embodiment, the rf voltage filtering unit 420 includes a resistor R24, an inductor L13, an inductor L14, a capacitor C42, and a capacitor C37, wherein one end of the resistor R24 is used as an input end of the rf voltage filtering unit 420, the other end of the resistor R24 is connected to one end of the inductor L13 and one end of the inductor L14, the other end of the inductor L13 and the other end of the inductor L14 are both used as output ends of the rf voltage filtering unit 420, one end of the capacitor C42 is connected to one end of the inductor L13, the other end of the capacitor C42 is grounded, one end of the capacitor C37 is connected to one end of the inductor L14, and the other end of the capacitor C37 is grounded.
In this way, it should be noted that the resistor R24, the inductor L13, the inductor L14, the capacitor C42 and the capacitor C37 form a filter network, and are used for filtering the voltage input from the power supply module 200 to eliminate the noise signal in the voltage.
Further, referring to fig. 2, in an embodiment, the pi cell 430 includes an inductor L1, a capacitor C1, and a capacitor C2, one end of the inductor L1 is connected to the output terminal of the balun 410, the other end of the inductor L1 is connected to the bluetooth antenna ANT, one end of the capacitor C1 is connected to one end of the inductor L1, the other end of the capacitor C1 is connected to one of the printed extension lines 431 as one of the ground terminals of the pi cell 430 and then grounded, one end of the capacitor C2 is connected to the other end of the inductor L1, and the other end of the capacitor C2 is connected to the other printed extension line 431 as the other ground terminal of the pi cell 430 and then grounded.
In this way, it should be noted that the inductor L1, the capacitor C1, and the capacitor C2 form a filter network, and perform filtering processing on the bluetooth signal received and transmitted by the bluetooth antenna ANT.
It should be noted that, as shown in fig. 3, which is a schematic diagram of the transmission loss of the bluetooth module 10 before the improvement (i.e. in the case that the pi-type unit 430 is not additionally provided with the printed extension 431 before the improvement), as can be seen from fig. 3, the absolute value of the attenuation value of the bluetooth module 10 before the improvement to the second harmonic is 19 db. Fig. 4 is a schematic diagram of transmission loss of the modified bluetooth module 10 (in the case of adding the printed extension 431 to the pi-shaped cell 430 before modification), and it can be seen from fig. 4 that the absolute value of the attenuation value of the bluetooth module 10 before modification for the second harmonic is 64 db. By comparing fig. 3 and fig. 4, in the case that the printed extension lines 431 are additionally arranged at both the two grounding ends of the pi-type unit 430 (that is, the other end of the capacitor C1 is connected to the ground after being connected to the printed extension line 431, and the other end of the capacitor C2 is connected to the ground after being connected to the printed extension line 431), the suppression capability of the bluetooth module 10 on the second harmonic wave can be greatly improved, that is, the overall filtering capability of the bluetooth module 10 can be enhanced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A Bluetooth module, comprising:
a main control module;
the input end of the power supply module is used for being connected with external equipment, and the output end of the power supply module is connected with the main control module;
the storage module is connected with the output end of the power supply module; and
the Bluetooth module comprises a balun unit, a radio frequency voltage filtering unit and a pi-type unit, wherein the input end of the balun unit is connected with the output ends of the main control module and the radio frequency voltage filtering unit respectively, the input end of the radio frequency voltage filtering unit is connected with the output end of the power supply module, the pi-type unit is connected with the output end of the balun unit, and two grounding ends of the pi-type unit are grounded after being provided with a printed extension line.
2. The bluetooth module according to claim 1, wherein the balun unit includes a capacitor C32, a capacitor C36, a capacitor C31, an inductor L12, a capacitor C5, an inductor L10, and a capacitor C35, one end of the capacitor C32 and one end of the capacitor C36 are used as input terminals of the balun unit, the other end of the capacitor C32 is connected to one end of the capacitor C31, the other end of the capacitor C31 is used as an output terminal of the balun unit, one end of the inductor L12 is connected to the other end of the capacitor C31, the other end of the inductor L12 is connected to the other end of the capacitor C36, one end of the capacitor C5 is connected to one end of the capacitor C32, the other end of the capacitor C5 is connected to the other end of the capacitor C36, one end of the inductor L10 is connected to the other end of the capacitor C32, the other end of the inductor L10 is grounded, and one end of the capacitor C35 is connected to the other end of the capacitor C36, the other end of the capacitor C35 is grounded.
3. The bluetooth module as claimed in claim 1, wherein the rf voltage filtering unit includes a resistor R24, an inductor L13, an inductor L14, a capacitor C42 and a capacitor C37, one end of the resistor R24 is used as an input terminal of the rf voltage filtering unit, the other end of the resistor R24 is connected to one end of the inductor L13 and one end of the inductor L14, the other end of the inductor L13 and the other end of the inductor L14 are both used as output terminals of the rf voltage filtering unit, one end of the capacitor C42 is connected to one end of the inductor L13, the other end of the capacitor C42 is grounded, one end of the capacitor C37 is connected to one end of the inductor L14, and the other end of the capacitor C37 is grounded.
4. The bluetooth module as claimed in claim 1, wherein the pi cell includes an inductor L1, a capacitor C1 and a capacitor C2, one end of the inductor L1 is connected to the output terminal of the balun cell, the other end of the inductor L1 is connected to the bluetooth antenna ANT, one end of the capacitor C1 is connected to one end of the inductor L1, the other end of the capacitor C1 is connected to one of the printed extension lines as one of the ground terminals of the pi cell and then grounded, one end of the capacitor C2 is connected to the other end of the inductor L1, and the other end of the capacitor C2 is connected to the other printed extension line as the other ground terminal of the pi cell and then grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121083943.7U CN216490485U (en) | 2021-05-19 | 2021-05-19 | Bluetooth module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121083943.7U CN216490485U (en) | 2021-05-19 | 2021-05-19 | Bluetooth module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216490485U true CN216490485U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121083943.7U Active CN216490485U (en) | 2021-05-19 | 2021-05-19 | Bluetooth module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216490485U (en) |
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2021
- 2021-05-19 CN CN202121083943.7U patent/CN216490485U/en active Active
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