CN201477129U - A Measuring System Realizing Interface Discharge - Google Patents
A Measuring System Realizing Interface Discharge Download PDFInfo
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- CN201477129U CN201477129U CN2009201607548U CN200920160754U CN201477129U CN 201477129 U CN201477129 U CN 201477129U CN 2009201607548 U CN2009201607548 U CN 2009201607548U CN 200920160754 U CN200920160754 U CN 200920160754U CN 201477129 U CN201477129 U CN 201477129U
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- 238000005259 measurement Methods 0.000 description 8
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Abstract
一种可实现接口放电的测量系统,包括接口(20),接口电路(21),测量仪器(22)。接口(20)包括信号接口端(201),地接口端(202)。接口电路(21)包括第一放电尖端(211),第二放电尖端(212),放电间隙(213)和阻焊窗(214),第一放电尖端(211)与信号接口端(201)连接,第二放电尖端(212)与地接口端(202)连接,阻焊窗(214)使第一放电尖端(211),第二放电尖端(212)以及放电间隙(213)充分裸露在空气中,根据安全标准或实际设计要求调整放电间隙(213)的大小。当接口(20)产生静电时,放电尖端击穿空气,对地放电,从而抑制静电放电,保护仪器内部部件。本实用新型具有结构简单,输入电容小,价格低廉等特点。
A measuring system capable of realizing interface discharge, comprising an interface (20), an interface circuit (21), and a measuring instrument (22). The interface (20) includes a signal interface end (201) and a ground interface end (202). The interface circuit (21) includes a first discharge tip (211), a second discharge tip (212), a discharge gap (213) and a solder resist window (214), and the first discharge tip (211) is connected to the signal interface terminal (201) , the second discharge tip (212) is connected to the ground interface (202), and the solder resist window (214) makes the first discharge tip (211), the second discharge tip (212) and the discharge gap (213) fully exposed in the air , adjusting the size of the discharge gap (213) according to safety standards or actual design requirements. When the interface (20) generates static electricity, the discharge tip breaks through the air and discharges to the ground, thereby suppressing static electricity discharge and protecting internal components of the instrument. The utility model has the characteristics of simple structure, small input capacitance, low price and the like.
Description
技术领域technical field
本实用新型涉及测量电变量的系统领域,特别涉及到可实现接口电路放电的测量电变量的系统领域。The utility model relates to the field of systems for measuring electric variables, in particular to the field of systems for measuring electric variables that can realize interface circuit discharge.
背景技术Background technique
日常生活中,静电可谓无处不在,从两个不同物体的接触与分离,到干燥空气的流动,都是静电产生的原因。如果条件适宜,静电瞬间即可发生,而且,静电的产生也会对电子元器件造成危害。静电放电(ESD)对电子元器件造成的危害可以引发多种问题,严重的可损坏产品的重要部件。In daily life, static electricity can be said to be everywhere. From the contact and separation of two different objects to the flow of dry air, it is the cause of static electricity. If the conditions are suitable, static electricity can occur instantly, and the generation of static electricity will also cause harm to electronic components. The harm caused by electrostatic discharge (ESD) to electronic components can cause a variety of problems, and serious damage can damage important parts of the product.
各种测量仪器的接口都是可能遭受静电放电的地方,当人们携带静电去接触仪器接口,或用携带静电的物体接触仪器接口都可能使接口带静电,并且传送到仪器内部,如果没有加以保护,仪器内部的器件很容易遭到损坏。为了解决上述问题,现有技术中提供了一种可以对接口进行放电的测量系统,下面结合附图1对该系统作简要介绍。The interface of various measuring instruments is a place that may be subject to electrostatic discharge. When people carry static electricity to touch the instrument interface, or touch the instrument interface with an object carrying static electricity, the interface may be charged with static electricity and transmitted to the inside of the instrument. If there is no protection , the components inside the instrument are easily damaged. In order to solve the above problems, a measurement system capable of discharging the interface is provided in the prior art. The system will be briefly introduced below with reference to FIG. 1 .
请参考图1,系统1包括接口10,接口电路11,示波器12。接口10中包括信号接口端101,地接口端102。接口电路11中包括压敏电阻111。Please refer to FIG. 1 , a
接口10、接口电路11和示波器12依次串联连接,压敏电阻111连接在信号接口端和地接口端之间,信号接口端101将接收到的信号送到示波器12中。The
压敏电阻111是“在一定电流电压范围内电阻值随电压而变”或者说“电阻值对电压敏感”的阻器。它的最大特点是当加在它上面的电压低于它的阈值UN时,流过它的电流极小,相当于一只关死的阀门,当电压超过阈值UN时,流过它的电流激增,相当于阀门打开。系统1正是利用压敏电阻111的这种特性,将其设置在信号接口端101和地接口端102之间。如果接口电路10遭受静电放电时,压敏电阻111的阻值急剧变小,静电电流通过压敏电阻111流向地,从而保护了接口电路10后面的器件的安全。The
在系统1中,接口电路10主要用于接收各种输入信号,它可以是仪器的信号输入端,SMA,SMB或USB等输入接口。测量仪器12可以是示波器、万用表或信号发生器等各种电测量仪器。In the
可见,上面提到的现有技术能够对测量设备的静电放电起到保护作用。但是,对于一些测量设备,由于高阻输入,输入电容的大小对带宽影响较大,所以如果信号接口端101和地接口端102之间连接的压敏电阻电容较大,就会影响到接口10的输入电容,以至减小带宽,从而给设计带来困难。如果要解决上述问题,就需要选用电容特别小的压敏电阻,但这样的压敏电阻一般价格都较高。It can be seen that the prior art mentioned above can protect the measuring equipment from electrostatic discharge. However, for some measuring equipment, due to the high-impedance input, the size of the input capacitance has a greater impact on the bandwidth, so if the piezoresistor capacitance connected between the
实用新型内容Utility model content
本实用新型的目的在于克服现有技术中存在的缺点,提供了一种用可实现接口电路放电的测量系统。The purpose of the utility model is to overcome the shortcomings in the prior art and provide a measurement system capable of realizing discharge of the interface circuit.
一种可实现接口电路放电的测量系统,包括一接口,一接口电路,一测量仪器,所述的接口包括一用于接收信号的信号接口端,一用于接地的地接口端,所述的接口电路串联在所述的接口和所述的测量仪器中间,所述的信号接口端将接收到的信号送到所述的测量仪器,A measurement system capable of realizing the discharge of an interface circuit, comprising an interface, an interface circuit, and a measuring instrument, the interface includes a signal interface end for receiving signals, and a ground interface end for grounding, the described The interface circuit is connected in series between the interface and the measuring instrument, and the signal interface port sends the received signal to the measuring instrument,
在所述的接口电路中,包括一第一放电尖端、一第二放电尖端、一放电间隙和一阻焊窗,所述的第一放电尖端与所述的信号接口端连接,所述的第二放电尖端与所述的地接口端连接,所述的第一放电尖端和所述的第二放电尖端不连接,所述的第一放电尖端的未连接端和所述的第二放电尖端的未连接端相对,所述的放电间隙处于所述的第一放电尖端的未连接端和所述的第二放电尖端的未连接端之间,所述的阻焊窗覆盖在所述的第一放电尖端、所述的第二放电尖端以及所述的放电间隙的上面,In the interface circuit, it includes a first discharge tip, a second discharge tip, a discharge gap and a solder resist window, the first discharge tip is connected to the signal interface port, and the first discharge tip is connected to the signal interface port. The two discharge tips are connected to the ground interface, the first discharge tip is not connected to the second discharge tip, and the unconnected end of the first discharge tip is connected to the second discharge tip. The unconnected ends are opposite, the discharge gap is between the unconnected end of the first discharge tip and the unconnected end of the second discharge tip, and the solder resist window covers the first above the discharge tip, the second discharge tip and the discharge gap,
所述的第一放电尖端和所述的第二放电尖端在所述的接口产生静电时对地放电,The first discharge tip and the second discharge tip discharge to the ground when static electricity is generated at the interface,
所述的阻焊窗使所述的第一放电尖端、所述的第二放电尖端以及所述的放电间隙充分暴露于空气中。The solder resist window fully exposes the first discharge tip, the second discharge tip and the discharge gap to the air.
本实用新型所述的测量系统,所述的第一放电尖端和第二放电尖端可以是由PCB走线构成的。In the measurement system described in the present invention, the first discharge tip and the second discharge tip may be formed by PCB traces.
本实用新型所述的测量系统,不仅可以实现接口电路放电,而且具有结构简单,输入电容小,价格低廉等特点。The measurement system described in the utility model not only can realize the discharge of the interface circuit, but also has the characteristics of simple structure, small input capacitance and low price.
附图说明Description of drawings
图1是现有技术中测量系统1的结构示意图。Fig. 1 is a schematic structural diagram of a
图2是本实用新型最佳实施例中测量系统2的结构示意图。Fig. 2 is a schematic structural diagram of the
图3是最佳实施例中直型BNC接口3的立体图。Fig. 3 is a perspective view of the
图4是最佳实施例中BNC焊盘4的结构示意图。Fig. 4 is a schematic diagram of the structure of the
具体实施方式Detailed ways
以下结合附图说明本实用新型的最佳实施方式。The best embodiment of the present utility model is described below in conjunction with accompanying drawing.
请参照图2,本实施例所选用的测量系统2,包括接口20,接口电路21,示波器22。接口20包括信号接口端201,地接口端202,接口电路21包括第一放电尖端211,第二放电尖端212,放电间隙213和阻焊窗214。Please refer to FIG. 2 , the
其中,信号接口端201与示波器22连接,地接口端202与地连接,第一放电尖端211与信号接口端201连接,第二放电尖端212与地接口端202连接,放电间隙213处于第一放电尖端211和第二放电尖端212之间,阻焊窗214覆盖在第一放电尖端211、第二放电尖端212以及放电间隙213的上面。Wherein, the signal interface end 201 is connected to the
在本实施例中,In this example,
信号接口端201用于接收信号,并将其送入到示波器22中,进行信号处理,第一放电尖端211和第二放电尖端212在接口20发生静电时通过放电间隙213对地放电,阻焊窗214使第一放电尖端211、第二放电尖端212以及放电间隙213充分暴露于空气中,利于放电。The signal interface terminal 201 is used to receive the signal and send it to the
在本实施例中,In this example,
请参照图3,接口20选用示波器的信号输入接口,即直型BNC接口,该直型BNC接口3包括信号连接引脚31,接地引脚32,接地引脚33,接地引脚34和接地引脚35。其中信号连接引脚31用于接收信号,接地引脚32,接地引脚33,接地引脚34和接地引脚35分别与地连接。Please refer to Fig. 3, the
在本实施例中,In this example,
请参照图4,BNC焊盘4包括焊孔41、焊孔42、焊孔43、焊孔44、焊孔45、第一放电尖端211、第二放电尖端212和阻焊窗214。Referring to FIG. 4 , the
通过PCB走线的方式使焊孔41和焊孔42分别伸出第一放电尖端211和第二放电尖端212,阻焊窗214使第一放电尖端211和第二放电尖端212裸露于空气中,不被阻焊层覆盖。这里所说的阻焊层是用来涂敷阻焊绿油等阻焊材料,从而防止不需要焊接的地方沾染焊锡。阻焊窗214是指在阻焊层上露出需要焊接的地方,这些地方不需要涂敷阻焊绿油等阻焊材料。The
在本实施例中,In this example,
结合参考图3和图4,直型BNC接口3的信号连接引脚31,接地引脚32,接地引脚33,接地引脚34和接地引脚35,分别与BNC焊盘4的焊孔41、焊孔42、焊孔43、焊孔44和焊孔45连接。并且焊孔43、焊孔44和焊孔45同焊孔42的作用相同。Referring to Fig. 3 and Fig. 4, the
在本实施例中,In this example,
放点间隙213是根据具体的设计要求或应遵循的安全标准得到,例如,可根据“GB4793.1-2007测量、控制和实验室用电气设备的安全要求第1部分:通用要求”中放电间隙的爬电距离进行定性计算,具体的距离可以通过在直型BNC接口3上加高压,观察漏电流是否达到需要的安全电流从而得到。The
当接口20有静电出现时,第一放电尖端211和第二放电尖端212上积聚大量的电荷,达到一定程度时,第一放电尖端211和第二放电尖端212之间的空气被击穿,对地进行放电,从而有效抑制了静电放电。When there is static electricity in the
由于第一放电尖端211和第二放电尖端212的相对面积很小,它们之间的寄生电容就非常小,所以对示波器输入电容的影响很小。Since the relative area of the
作为举例说明,接口20可以是各种电子测量仪器的接口,例如SMA,SMB或USB等接口。As an example, the
作为举例说明,接口电路21可以是输入放大电路,通讯接口电路或驱动电路等。As an example, the
作为举例说明,第一放电端211和第二放电端212可以由PCB走线构成,也可以由其他方式构成,只要两个放电端为铜皮制成,并且两个放电端相对即可。As an example, the
以上具体实施方式仅用于说明本实用新型,而非用于限定本实用新型。The above specific embodiments are only used to illustrate the present utility model, but not to limit the present utility model.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103473203A (en) * | 2013-09-12 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | USB (universal serial bus) interface circuit with electrostatic protection |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103473203A (en) * | 2013-09-12 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | USB (universal serial bus) interface circuit with electrostatic protection |
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