CN111711458B - Double-frequency-point tire pressure sensor frequency band compatibility method based on digital switch - Google Patents
Double-frequency-point tire pressure sensor frequency band compatibility method based on digital switch Download PDFInfo
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- CN111711458B CN111711458B CN202010584078.8A CN202010584078A CN111711458B CN 111711458 B CN111711458 B CN 111711458B CN 202010584078 A CN202010584078 A CN 202010584078A CN 111711458 B CN111711458 B CN 111711458B
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- frequency
- pressure sensor
- tire pressure
- digital switch
- capacitor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a frequency band compatibility method of a double-frequency tire pressure sensor based on a digital switch, which comprises the following steps: (1) the output end of the tire pressure sensor is connected with an antenna transmitting network; (2) the tire pressure sensor outputs a first frequency point signal; (3) the digital switch is closed, and the antenna transmitting network performs impedance matching and enters a first capacitance mode; (4) the tire pressure sensor outputs a second frequency point signal; (5) and the digital switch is opened, and the antenna transmitting network performs impedance matching and enters a second capacitance mode. The frequency band compatibility method of the double-frequency tire pressure sensor based on the digital switch provided by the invention realizes compatibility of 433.92MHz and 315MHz frequency bands of an antenna transmitting network of the tire pressure sensor.
Description
Technical Field
The invention relates to an antenna transmitting network of a tire pressure sensor, in particular to a frequency band compatibility method of a double-frequency tire pressure sensor based on a digital switch.
Background
With the popularization of automobiles and the advancement of automobile digitization, the types and the number of sensors on automobiles are increasing, and a tire pressure sensor is one of the sensors. Different tire pressure sensors are derived from different manufacturers and different vehicle types in different areas. The radio frequency channel of the sensor is divided into two frequency bands of 433.92MHz and 315 MHz.
However, since the signals at 433.92MHz and 315MHz are incompatible, the signal transmission strength is insufficient, and the signal attenuation is caused, the existing solutions mainly include two solutions: (1) the single frequency point antenna transmission network is used, and the signal amplifier is used to increase the transmission intensity of the radio frequency signal. To offset the attenuation of the antenna network to the signal, so that the signal strength of 433.92MHz and 315MHz reaches the design requirement. (2) The length of the transmitting antenna of the sensor is increased, and the transmitting bandwidth of the radio frequency antenna network of the sensor is increased, so that the compatibility of signals of 433.92MHz and 315MHz is achieved.
The scheme of using the signal amplifier can increase the transmission power consumption of the sensor and further reduce the service life of the sensor. The length of the transmitting antenna of the sensor is increased, and the signals of 433.92MHz and 315MHz are not on the optimal matching network of the antenna transmitting network while the volume of the sensor is increased.
Disclosure of Invention
In view of this, the invention provides a frequency band compatibility method of a dual-frequency tire pressure sensor based on a digital switch, which realizes compatibility of 433.92MHz and 315MHz frequency bands of an antenna transmission network of the tire pressure sensor.
Therefore, the invention provides a frequency band compatible method of a double-frequency tire pressure sensor based on a digital switch, which comprises the following steps:
(1) the output end of the tire pressure sensor is connected with an antenna transmitting network;
(2) the tire pressure sensor outputs a first frequency point signal;
(3) the digital switch is closed, and the antenna transmitting network performs impedance matching and enters a first capacitance mode;
(4) the tire pressure sensor outputs a second frequency point signal;
(5) and the digital switch is opened, and the antenna transmitting network performs impedance matching and enters a second capacitance mode.
Further, when the voltage at the I01 port of the digital switch is at a high level, the digital switch is closed; when the voltage at the port I01 of the digital switch is low, the digital switch is opened.
Further, the first frequency point signal is a signal of 315MHz frequency band.
Further, in the step (3), in the first capacitor mode, the capacitor C8 in the antenna transmission network is short-circuited, the capacitor C4, the capacitor C10 and the capacitor C9 are connected in parallel, and the signal impedance of the first frequency point signal in the antenna transmission network is minimum.
Further, the second frequency point signal is a 433.92MHz frequency band signal.
Further, in the step (5), in the second capacitance mode, the capacitor C8 in the antenna transmission network is not short-circuited, the capacitor C10 and the capacitor C9 are connected in parallel, the capacitor C8 is connected in series between the capacitor C10 and the capacitor C9, and the signal impedance of the second frequency point signal in the antenna transmission network is minimum.
The invention provides a frequency band compatible method of a double-frequency tire pressure sensor based on a digital switch, which is characterized in that two groups of antenna capacitance parameters are compared by respectively matching an antenna transmitting network of 433.92HMz and an antenna transmitting network of 315HMz of the tire pressure sensor, and the difference of the capacitance parameters is found out. The capacitance parameters in the two antenna networks are modified, so that the impedance matching of the antenna transmitting networks is ensured to be optimal, and the difference points of the two networks are reduced. And finally, the two antenna networks are combined into one by utilizing the switching function of the digital sub-switch, so that the purpose that one tire pressure sensor is compatible with 433.92MHz and 315MHz frequency bands is achieved.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a circuit diagram of a frequency band compatibility method of a dual-frequency tire pressure sensor based on a digital switch according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The first embodiment is as follows:
referring to fig. 1, a frequency band compatibility method of a dual-frequency tire pressure sensor based on a digital switch according to a first embodiment of the present invention is shown, and includes the following steps:
(1) the output end of the tire pressure sensor is connected with an antenna transmitting network;
(2) the tire pressure sensor outputs a first frequency point signal;
(3) the digital switch is closed, and the antenna transmitting network performs impedance matching and enters a first capacitance mode;
(4) the tire pressure sensor outputs a second frequency point signal;
(5) and the digital switch is opened, and the antenna transmitting network performs impedance matching and enters a second capacitance mode.
Specifically, referring to fig. 1, when the voltage at the I01 port of the digital switch is at a high level, the digital switch is closed; when the voltage at the port I01 of the digital switch is low, the digital switch is opened.
Specifically, referring to fig. 1, the first frequency point signal is a signal in a 315MHz frequency band.
Further, in the step (3), in the first capacitance mode, the capacitor C8 in the antenna transmission network is short-circuited, the capacitor C4, the capacitor C10 and the capacitor C9 are connected in parallel, and the signal impedance of the signal at the first frequency point in the antenna transmission network is minimum.
Specifically, referring to fig. 1, the second frequency point signal is a 433.92MHz frequency band signal.
Specifically, referring to fig. 1, in step (5), in the second capacitance mode, the C8 capacitor in the antenna transmission network is not short-circuited, the C10 capacitor and the C9 capacitor are connected in parallel, the C8 capacitor is connected in series between the C10 capacitor and the C9 capacitor, and the signal impedance of the second frequency point signal in the antenna transmission network is minimum.
The invention provides a frequency band compatible method of a double-frequency tire pressure sensor based on a digital switch, which is characterized in that two groups of antenna capacitance parameters are compared by respectively matching an antenna transmitting network of 433.92HMz and an antenna transmitting network of 315HMz of the tire pressure sensor, and the difference of the capacitance parameters is found out. The capacitance parameters in the two antenna networks are modified, so that the impedance matching of the antenna transmitting networks is ensured to be optimal, and the difference points of the two networks are reduced. And finally, the two antenna networks are combined into one by utilizing the switching function of the digital sub-switch, so that the purpose that one tire pressure sensor is compatible with 433.92MHz and 315MHz frequency bands is achieved.
Referring specifically to the description of figure 1: u2 is a digital switch, when the voltage of the I01 port is high level, the RF1, the RF2 and the RFC port are conducted mutually, namely the C8 capacitor is short-circuited, and the C4 capacitor is connected with the C10 in parallel, so that the parameters of the antenna network are changed. When the digital switch does not work, the impedance of the antenna network parameter formed by the C10, the C8 and the C9 to the 433.92MHz signal is minimum, and the loss of the frequency point signal is minimum under the parameter. After the digital switch works, the C10, the C4 and the C9 form a new antenna network parameter with minimum signal impedance to 315MHz, and the circuit design of the double-frequency point tire pressure sensor of the digital switch is realized.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A double-frequency tire pressure sensor frequency band compatible method based on a digital switch is characterized by comprising the following steps:
(1) the output end of the tire pressure sensor is connected with an antenna transmitting network;
(2) the tire pressure sensor outputs a first frequency point signal;
(3) when a digital switch is closed, the voltage of an IO1 port of the digital switch is at a high level, the antenna transmitting network performs impedance matching and enters a first capacitance mode, a C8 capacitor in the antenna transmitting network is short-circuited in the first capacitance mode, a C4 capacitor, a C10 capacitor and a C9 capacitor are connected in parallel, and the signal impedance of the first frequency point signal in the antenna transmitting network is minimum;
(4) the tire pressure sensor outputs a second frequency point signal;
(5) the digital switch is turned on, the voltage of an IO1 port of the digital switch is low level, the antenna transmitting network performs impedance matching and enters a second capacitance mode, a C8 capacitor in the antenna transmitting network is not short-circuited in the second capacitance mode, a C10 capacitor and a C9 capacitor are connected in parallel, a C8 capacitor is connected in series between a C10 capacitor and a C9 capacitor, and the signal impedance of a second frequency point signal in the antenna transmitting network is minimum.
2. The method for frequency band compatibility of the dual-frequency tire pressure sensor based on the digital switch of claim 1, wherein the first frequency signal is a signal in a 315MHz frequency band.
3. The method for frequency band compatibility of the dual-frequency tire pressure sensor based on the digital switch of claim 1, wherein the second frequency signal is a 433.92MHz frequency band signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010584078.8A CN111711458B (en) | 2020-06-23 | 2020-06-23 | Double-frequency-point tire pressure sensor frequency band compatibility method based on digital switch |
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| CN202010584078.8A CN111711458B (en) | 2020-06-23 | 2020-06-23 | Double-frequency-point tire pressure sensor frequency band compatibility method based on digital switch |
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| CN111711458A CN111711458A (en) | 2020-09-25 |
| CN111711458B true CN111711458B (en) | 2022-06-07 |
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| CN114039612B (en) * | 2021-11-15 | 2023-05-02 | 中国电力科学研究院有限公司 | Dual-frequency wireless multiplexing transmitting system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101644616B (en) * | 2009-05-20 | 2011-06-22 | 中国科学院声学研究所 | Integrated surface acoustic wave wireless pressure sensor applied to TPMS |
| CN102130656B (en) * | 2010-01-12 | 2015-04-08 | 东南大学 | Novel integrated circuit structure of full-integrated dual frequency band low-noise amplifier |
| US20140065982A1 (en) * | 2012-09-05 | 2014-03-06 | Seong-Youp Suh | Plug-and-play time-variant antenna module for wireless communication devices |
| CN104640011A (en) * | 2014-12-11 | 2015-05-20 | 福建星网锐捷网络有限公司 | Dual-frequency power amplification device applied to AP (access point) and AP equipment |
| CN105471397A (en) * | 2015-12-11 | 2016-04-06 | 锐迪科创微电子（北京）有限公司 | Double-frequency radio frequency power amplification module |
| US10389392B1 (en) * | 2016-11-03 | 2019-08-20 | Hrl Laboratories, Llc | High-Q quartz-based inductor array for antenna matching |
| TWM549458U (en) * | 2017-07-06 | 2017-09-21 | Keycore Tech Corp | Antenna impedance matching circuit having multiple specific frequency bands and tire pressure detection device |
| CN109150206A (en) * | 2018-09-14 | 2019-01-04 | 深圳传音通讯有限公司 | Antenna-matching circuit, terminal device and impedance matching methods |
| CN110380740A (en) * | 2019-06-24 | 2019-10-25 | 西安联乘智能科技有限公司 | A kind of vehicle intelligent antenna system |
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