CN111342795B - 胎压监测传感器的射频匹配装置 - Google Patents
胎压监测传感器的射频匹配装置 Download PDFInfo
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- H—ELECTRICITY
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- 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
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- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
- H03H7/40—Automatic matching of load impedance to source impedance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0452—Antenna structure, control or arrangement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2241—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in or for vehicle tyres
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
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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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/709—Correlator structure
- H04B1/7093—Matched filter type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
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- B60Y2400/306—Pressure sensors
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Abstract
本发明提供一种胎压感测器的射频匹配装置,依序包括系统控制单元、射频控制单元、射频匹配单元及多频天线,其中射频匹配单元依序包括谐振部、滤波部及匹配部,其中谐振部连接到射频控制单元,调整到所需的多种频段的起始频率与截止频率,滤波部连接在谐振部与匹配部之间,以抑制及消除杂讯与不需要的倍频频率讯号,而匹配部则是让多频射频讯号最大功率转移到多频天线,使得多频天线可以传送多个不同频率的射频讯号。
Description
技术领域
本发明是有关于射频匹配装置,尤指一种设置在胎压监测传感器中无需任何切换电路,即可匹配多频射频天线所需的匹配电路的射频匹配装置。
背景技术
一般而言,胎压检测系统主要有两个部分,安装在车内的监控主机及安装在轮胎中的胎压监测传感器,监控主机与胎压监测传感器之间传送无线信号的通用的无线射频频率,大致为315MHz或433.92MHz等两种频率,因此,为了让胎压监测传感器可以适用在不同频率的监控主机,或者让监控主机可以接收不同频率的胎压监测传感器的信号。业者最惯用的手法是让依销售国家或地区的开放频段分别选用单一频率的胎压监测传感器搭配相同频率的监控主机来销售,造成销售预估及库存管理的困难。
基于上述的原因,有些业者针对此一问题,分别提出不同的改良技术并且申请专利,例如英国施拉德电子公司(Schrader ElectronicsLtd)所申请的美国专利(US9333815),其名称为一种多频胎压监测器,此美国专利使用切换电路分别切换到两个不同的频率的匹配电路,再由同一个天线将信号传送出去。但有其他业者认为使用两个匹配电路的设计,仍有改善的空间,因此提出改良方案,例如为升电装工业股份有限公司所申请的中国台湾发明专利(TWI625043),其名称为双频胎压监测传感器的匹配部,此中国台湾专利是在匹配单元上耦接一个二极体,透过微控单元控制二极体的工作状态,而切换匹配电路的阻抗。
但是上述的中国台湾专利或美国专利还是都需要一个切换的手段,来调整匹配电路的阻抗,进而从天线发射出信号,此种电路设计的方式,匹配电路还是需要切换不同频率所需的阻抗,而切换动作会增加胎压监测传感器的电力消耗,且电路动作效率较低及成本较高的缺点,因此,实有必要改善此一问题。
发明内容
有鉴于先前技术的问题,本发明之一目的是提供胎压监测传感器的射频匹配装置在无需切换电路的架构下,即可匹配多频段信号,以达到减少电力消耗及成本的目的。
根据本发明之一目的,是提供一种胎压监测传感器的射频匹配装置,包括系统控制单元、射频控制单元、射频匹配单元及多频天线,其中系统控制单元连接射频控制单元,并负责决定射频控制单元要发出多个不同频率信号的其中一个,而射频匹配单元连接在射频控制单元及多频天线之间,且射频匹配单元依序包括谐振部、滤波部及匹配部,其中谐振部连接到射频控制单元,调整到所需的多种频段的起始频率与截止频率,滤波部连接在谐振部与匹配部之间,以抑制杂讯与不需要的倍频频率信号,而匹配部则是让射频信号可以最大功率传输到多频天线,使得多频天线可以传送多个不同频率的射频信号。
其中,谐振部包括复数个被动元件,各被动元件之间以串联及并联的其中之一或两者方式连接在一起,以调整电路匹配所需多种频段的起始频率与截止频率。
其中,滤波部是为滤波器,尤其是低通滤波器或带通滤波器或频阻滤波器,使得不需要的杂讯及倍频频率信号被抑制。
其中,射频匹配单元包括复数个被动元件,各被动元件之间以串联及并联的其中之一或两者方式连接在一起,并且能匹配于射频控制单元要发出各个频率信号。
据上所述本发明具有下述之一或多个特点:
1、无须任何切换开关元件,提升整体电路动作效率,减少占用电路设计空间。
2、多频天线只需要谐振部调试出所需频段的谐振点,即匹配于发射不同频率的射频信号。
3、由于没有切换开关元件,可节省零件成本,降低功率消耗,提高胎压监测传感器电池的使用时间。
附图说明
图1为本发明的架构示意图。
图2为本发明的射频匹配单元的实施例示意图。
图3为图2的实施例经谐振部的信号分析示意图。
图4为图2的实施例经谐振部的第一频率的其倍频频率信号分析示意图。
图5为图2的实施例经谐振部的第二频率的其倍频频率信号分析示意图。
图6为图2的实施例经谐振部及滤波部的信号分析示意图。
图7为图2的实施例经谐振部及滤波部的信号分析示意图。
图8为图2的实施例经谐振部及滤波部的信号分析示意图。
图9为图2的实施例经谐振部及滤波部的信号分析示意图。
图10为图2的实施例经谐振部及滤波部的信号分析示意图。
具体实施方式
请参阅图1所示,本发明是一种胎压监测传感器的射频匹配装置,包括系统控制单元1、射频控制单元2、射频匹配单元3及多频天线4,其中系统控制单元1连接射频控制单元2,并负责决定射频控制单元2要发出多个不同频率信号的其中一个,而射频匹配单元3连接在射频控制单元2及多频天线4之间。
在本发明中,射频匹配单元3依序包括谐振部30、滤波部31及匹配部32,其中谐振部30连接到射频控制单元2,调整到所需的多种频段的起始频率与截止频率,滤波部31连接在谐振部30与匹配部32之间,系抑制及消除杂讯,而匹配部32则是让射频信号的能量(信号功率)最大功率可以传输到多频天线4,使得多频天线4可以传送多个不同频率的射频信号。
在本发明中,请参阅图2所示,谐振部30包括复数个被动元件(1~4),各被动元件之间以串联及并联的其中之一或两者方式连接在一起,以调整射频信号到达所需多种频段的起始频率与截止频率。滤波部31是为滤波器,尤其是低通滤波器或带通滤波器或频阻滤波器,使得所需的多种频率的倍频频率信号被截止。射频匹配单元32包括复数个被动元件(A~D),各被动元件之间以串联及并联的其中之一或两者方式连接在一起,并且能匹配于射频控制单元要发出各个频率信号。
为了更进一步了解本案,乃提出依图2所示的实施例进行说明如下:
在本实施例中,谐振部30包括第一电容301、第一电感302、第二电感303及第二电容304,而匹配部32包括第三电容321、第三电感323、第四电感322及第四电容324,其中第一电容301的一端接地,第一电感302的一端连接射频控制单元2,第一电容301的另端连接在第一电感302与射频控制单元之间,第一电感302的另端连接第二电容304的一端,第二电感303的一端电源,另端连接在第一电感302与第二电容304之间,第二电容304的另端连接滤波器310的一端,滤波器310的另端连接第三电容321的一端,第三电容321的另端连接第三电感323的一端,第三电感323的另端连接第四电感322的一端及第四电容324的一端,第四电感322的另端及第四电容324的另端都接地,且第四电容324的一端也连接到天线单元。
其中,第三电容321、第三电感323、第四电感322及第四电容324根据机构外壳的装置设计与PCB板材、走线、阻抗、零件配置的实际情形,逐一调试出适当摆放位置与适当零件值,让匹配部32可同时匹配于第一频率(315MHz)与第二频率(433.92MHz),并将的串接于滤波器310之后。再者,以上不同种类的电阻或电容或电感,并以串联或并联摆放或调整元件值等调试方式,调试出一个或一个以上所需频段的谐振点,谐振点可于网路分析仪S11参数看出,如此即可让多频天线可以发射出多个频率的射频信号。
请参阅图3所示,系统控制单元1决定射频控制单元2要发出第一频率及第二频率的其中一个,但在未经过滤波部31前,可以从图3看到在0~-20dBm之间的频宽为300MHz~1GHz。请参阅图4所示,第一频率已经可以顺利发射出去,但第一频率的二倍及三倍的倍频频率的信号强度还是太强。请参阅图5所示,第二频率已经可以顺利发射出去,但第二频率的二倍的倍频频率的信号强度还是太强,为能正常动作并避免影响其他装置的运作,请参阅图6所示,再透过滤波器310来滤除、抑制后,0~-20dBm之间的频宽为300MHz~550MHz,而且第一频率的二倍及三倍的倍频频率的信号已经有效的被抑制(如图7所示),再者,第二频率的二倍的倍频频率的信号也有效的被抑制(如图8所示),最后,请参阅图9及10所示,再经由匹配部32可以看到第一频率及第二频率都可以顺利的在很少杂讯及倍频频率的干扰下有效的发射出去。
据上所述,本发明无须任何切换开关元件,提升整体电路动作效率,减少占用电路设计空间。多频天线只需要利用谐振部30调试出所需频段的谐振点,而匹配于发射不同频率的射频信号。再者,本发明不需要切换开关元件,即可节省零件成本,有效降低功率消耗,提高胎压监测传感器的电池的使用时间。
【符号说明】
1:控制单元
2:射频控制单元
3:射频匹配单元
4:多频天线
30:谐振部
301:第一电容
302:第一电感
303:第二电感
304:第二电容
31:滤波部
310:滤波器
32:匹配部
321:第三电容
322:第四电感
323:第三电感
324:第四电容。
Claims (3)
1.一种胎压监测传感器的射频匹配装置,其特征在于,包括:
一射频控制单元;
一多频天线;
一系统控制单元,所述系统控制单元连接所述射频控制单元,并负责决定所述射频控制单元要发出多个不同频率信号的其中一个;
一射频匹配单元,所述射频匹配单元连接在所述射频控制单元及所述多频天线之间,无须切换电路,并包括:
一谐振部,所述谐振部连接到所述射频控制单元,调整到所需的多种频段的起始频率与截止频率之间的频率宽度,
一滤波部,所述滤波部连接在所述谐振部,以抑制噪声与倍频频率信号;及
一匹配部,所述匹配部连接所述滤波部,让所述滤波部输出的各射频信号以最大功率从所述多频天线输出;所述滤波部为滤波器;所述谐振部分包括第一电容、第一电感、第二电感和第二电容,第一电容的一端接地,第一电感的一端连接射频控制单元,第一电容的另一端连接在第一电感和射频控制单元之间,第一电感的另一端连接第二电容的一端,第二电感的一端连接电源,第二电感另一端为连接到在第一个电感和第二个电容之间,第二电容的另一端连接到滤波器的一端,用于调节射频频率所需的各频段的初始频率和截止频率匹配。
2.如权利要求1所述的胎压监测传感器的射频匹配装置,其特征在于,所述滤波器是为低通滤波器或带通滤波器或频阻滤波器。
3.如权利要求1所述的胎压监测传感器的射频匹配装置,其特征在于,所述射频匹配单元包括复数个被动元件,各所述被动元件间以串联及并联的其中之一或两者方式连接在一起,并且能匹配于所述射频控制单元要发出各个频率信号。
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