CN112383132A - 一种双源可视卡 - Google Patents
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- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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Abstract
本发明公开了一种双源可视卡,其包括主控芯片、显示芯片、电子纸屏、NFC模块和电池模块,电池模块、主控芯片、显示芯片、电子纸屏依次连接,NFC模块用于在近场环境下将外部信号转化成电能为主控芯片供电,电池模块用于直接向主控芯片供电,主控芯片将电能传输至显示芯片,显示芯片驱动电子纸屏进行显示,当NFC模块和电池模块均可供电时,优先使用NFC模块进行供电。本发明双源可视卡通过电源模块和NFC模块的结合设计,可以减少电池损耗,延长电池寿命,又能够保证在外场强度不够的情况下,依然有足够的电流去驱动屏幕,保证正常显示。
Description
技术领域
本发明涉及可视卡技术领域,特别涉及一种双源可视卡。
背景技术
当前可视卡分为有源可视卡和无源可视卡,有源可视卡通过卡内内置电源模块向控制芯片供电,驱使电子纸屏显示信息,读写稳定;无源可视卡无内置电源,其通信是通过内置NFC模块感应外部信号,转换为电能从而进行屏幕读写。
有源可视卡在高温或低温下电池不能正常工作,电池为一次性,无法更换。电池寿命为7-10年,根据卡的使用次数以及使用环境,实际工程中,有源可视卡的使用寿命可能更短。
无源可视卡由于没有内置电源,卡和读写器之间的距离受限,并且由于用户刷卡习惯的不同,当无源卡贴近读写器的时间不够、距离过远或者刷卡过程中移动卡,都容易造成感应电流过小,不足以驱动显示屏显示数字信息。在卡做交易的时侯,交易时间是比较短的,即使用户将卡贴近POS机马上移开,交易也足够完成。但是可是卡的控制屏显示时间较长,时间达到1S以上,这样一来用户如果将卡靠近POS机后,立马撤走,这时流程还没走完,交易失败,甚至屏只显示了一半,残留在屏幕上的是未显示完成的乱码。这样就给用户带来困扰,带来不好的用户体验。
发明内容
本发明要解决的问题是提供一种可减少电池损耗、工作寿命长的双源可视卡。
为了解决上述问题,本发明提供了一种双源可视卡,包括主控芯片、显示芯片、电子纸屏、NFC模块和电池模块,所述电池模块、主控芯片、显示芯片、电子纸屏依次连接,所述NFC模块用于在近场环境下将外部信号转化成电能为所述主控芯片供电,所述电池模块用于直接向所述主控芯片供电,所述主控芯片将电能传输至显示芯片,所述显示芯片驱动所述电子纸屏进行显示,当NFC模块和电池模块均可供电时,优先使用所述NFC模块进行供电。
作为本发明的进一步改进,所述NFC模块包括NFC芯片、NFC线圈和NFC供电电路,所述电池模块包括电池和电池供电电路,所述NFC供电电路包括整流管D3,所述NFC线圈获取的交流电通过整流管D3转化成直流电提供给所述主控芯片,所述电池供电电路包括电阻R1、电阻R2、NMOS管Q1和PMOS管Q2,电阻R1的第一端和PMOS管Q2的S端接入所述电池的正极,所述电池的负极接地,所述电池的电能由PMOS管Q2的D端提供给所述主控芯片,PMOS管Q2的G端和NMOS管Q1的D端均与电阻R1的第二端连接,NMOS管Q1的S端接地,NMOS管Q1的G端和电阻R2的第二端均与使能信号端连接,所述使能信号端的使能信号由所述主控芯片输出。
作为本发明的进一步改进,所述NFC供电电路还包括防倒灌二极管D2,整流管D3通过防倒灌二极管D2与所述主控芯片连接。
作为本发明的进一步改进,所述电池供电电路还包括防倒灌二极管D1,PMOS管Q2的D端通过防倒灌二极管D1与所述主控芯片连接。
作为本发明的进一步改进,所述NFC模块的供电电压大于所述电池模块的供电电压,当NFC模块和电池模块均可供电时,优先使用供电电压高的模块进行供电。
作为本发明的进一步改进,所述NFC模块的供电电压为4V-4.5V,所述电池模块的供电电压为3V-3.7V。
本发明的有益效果:
本发明双源可视卡通过电源模块和NFC模块的结合设计,可以减少电池损耗,延长电池寿命,又能够保证在外场强度不够的情况下,依然有足够的电流去驱动屏幕,保证正常显示。
上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段,而可依照说明书的内容予以实施,并且为了让本发明的上述和其他目的、特征和优点能够更明显易懂,以下特举较佳实施例,并配合附图,详细说明如下。
附图说明
图1是本发明优选实施例中双源可视卡的结构示意图;
图2是本发明优选实施例中双源可视卡中NFC供电电路和电池供电电路的电路图。
具体实施方式
下面结合附图和具体实施例对本发明作进一步说明,以使本领域的技术人员可以更好地理解本发明并能予以实施,但所举实施例不作为对本发明的限定。
如图1所示,为本发明优选实施例中的双源可视卡,该双源可视卡包括主控芯片、显示芯片、电子纸屏、NFC模块和电池模块,电池模块、主控芯片、显示芯片、电子纸屏依次连接,NFC模块用于在近场环境下将外部信号转化成电能为主控芯片供电,电池模块用于直接向主控芯片供电,主控芯片用于将电能传输至显示芯片,并发送控制命令驱动显示芯片工作,显示芯片用于将待显示的数据和电能发送至电子纸屏,电子纸屏用于将待显示数据显示,当NFC模块和电池模块均可供电时,优先使用NFC模块进行供电。
在本实施例中,NFC模块的供电电压大于电池模块的供电电压,当NFC模块和电池模块均可供电时,优先使用供电电压高的模块进行供电。进一步的,NFC模块的供电电压为4V-4.5V,电池模块的供电电压为3V-3.7V。
在本实施例中,NFC模块包括NFC芯片、NFC线圈和NFC供电电路,电池模块包括电池和电池供电电路。
如图2所示,NFC供电电路包括整流管D3,NFC线圈获取的交流电通过整流管D3转化成直流电提供给主控芯片,电池供电电路包括电阻R1、电阻R2、NMOS管Q1和PMOS管Q2,电阻R1的第一端和PMOS管Q2的S端接入电池的正极,电池的负极接地,电池的电能由PMOS管Q2的D端提供给主控芯片,PMOS管Q2的G端和NMOS管Q1的D端均与电阻R1的第二端连接,NMOS管Q1的S端接地,NMOS管Q1的G端和电阻R2的第二端均与使能信号端连接,使能信号端的使能信号BATT_ON由主控芯片输出。
因为电池不能直接给控制芯片供电,否则在不使用卡的时侯,控制芯片一直在耗电,虽然控制芯片可以进入睡眠模式,但也有100uA左右的漏电流,这对可视卡来说已经是一个比较大的功耗了,因此,NMOS管Q1和PMOS管Q2作为电池的开关。
在本实施例中,NFC供电电路还包括防倒灌二极管D2,整流管D3通过防倒灌二极管D2与主控芯片连接。电池供电电路还包括防倒灌二极管D1,PMOS管Q2的D端通过防倒灌二极管D1与主控芯片连接。由于是两个电源供电,如果两个电源接到一起,由于电压不同,会发生电流倒灌的异常,因此利用防倒灌二极管D1和D2来防止电流倒灌。
本实施例中可视卡的工作逻辑如下:
在可视卡没有进入NFC场时,控制芯片不工作,BATT_ON的电平被电阻R2拉到地,即低电平,则NMOS管Q1的Vgs=0,NMOS管Q1关闭,进一步可以得出PMOS管Q2的Vgs=0,PMOS管Q2关闭,即电池的电能不能向后提供到控制芯片。
当可视卡进入NFC场时,控制芯片从NFC线圈获取电能,控制芯片开始工作,同时拉高使能信号BATT_ON,使NMOS管Q1和PMOS管Q2打开,则电池可向控制芯片供电。
在电子纸屏执行完显示流程后,控制芯片将控制信号BATT_ON拉低,这样,如果将可视卡从场中撤走后,电池也不会给控制芯片供电,从而增加电池的使用总时长。
具体的,当可视卡靠近POS机时,先用短暂的时间完成交易,接下来处理显示流程,如果显示流程还未结束就将可视卡撤走,则电池供电保证将显示流程走完。
本发明双源可视卡通过电源模块和NFC模块的结合设计,可以减少电池损耗,延长电池寿命,又能够保证在外场强度不够的情况下,依然有足够的电流去驱动屏幕,保证正常显示。
以上实施例仅是为充分说明本发明而所举的较佳的实施例,本发明的保护范围不限于此。本技术领域的技术人员在本发明基础上所作的等同替代或变换,均在本发明的保护范围之内。本发明的保护范围以权利要求书为准。
Claims (6)
1.一种双源可视卡,其特征在于,包括主控芯片、显示芯片、电子纸屏、NFC模块和电池模块,所述电池模块、主控芯片、显示芯片、电子纸屏依次连接,所述NFC模块用于在近场环境下将外部信号转化成电能为所述主控芯片供电,所述电池模块用于直接向所述主控芯片供电,所述主控芯片将电能传输至显示芯片,所述显示芯片驱动所述电子纸屏进行显示,当所述NFC模块和电池模块均可供电时,优先使用所述NFC模块进行供电。
2.如权利要求1所述的双源可视卡,其特征在于,所述NFC模块包括NFC芯片、NFC线圈和NFC供电电路,所述电池模块包括电池和电池供电电路,所述NFC供电电路包括整流管D3,所述NFC线圈获取的交流电通过整流管D3转化成直流电提供给所述主控芯片,所述电池供电电路包括电阻R1、电阻R2、NMOS管Q1和PMOS管Q2,电阻R1的第一端和PMOS管Q2的S端接入所述电池的正极,所述电池的负极接地,所述电池的电能由PMOS管Q2的D端提供给所述主控芯片,PMOS管Q2的G端和NMOS管Q1的D端均与电阻R1的第二端连接,NMOS管Q1的S端接地,NMOS管Q1的G端和电阻R2的第二端均与使能信号端连接,所述使能信号端的使能信号由所述主控芯片输出。
3.如权利要求2所述的双源可视卡,其特征在于,所述NFC供电电路还包括防倒灌二极管D2,整流管D3通过防倒灌二极管D2与所述主控芯片连接。
4.如权利要求2所述的双源可视卡,其特征在于,所述电池供电电路还包括防倒灌二极管D1,PMOS管Q2的D端通过防倒灌二极管D1与所述主控芯片连接。
5.如权利要求1所述的双源可视卡,其特征在于,所述NFC模块的供电电压大于所述电池模块的供电电压,当NFC模块和电池模块均可供电时,优先使用供电电压高的模块进行供电。
6.如权利要求5所述的双源可视卡,其特征在于,所述NFC模块的供电电压为4V-4.5V,所述电池模块的供电电压为3V-3.7V。
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