CN107121576A - A kind of adjustable resistor type testing device of mobile terminal - Google Patents
A kind of adjustable resistor type testing device of mobile terminal Download PDFInfo
- Publication number
- CN107121576A CN107121576A CN201610100820.7A CN201610100820A CN107121576A CN 107121576 A CN107121576 A CN 107121576A CN 201610100820 A CN201610100820 A CN 201610100820A CN 107121576 A CN107121576 A CN 107121576A
- Authority
- CN
- China
- Prior art keywords
- resistance
- test interface
- triode
- adjustable
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
Abstract
The invention discloses a kind of adjustable resistor type testing device of mobile terminal, including test interface, operational amplifier, triode, first resistor, 0 Europe resistance and electric capacity；The positive input of operational amplifier and the first end of adjustable resistance are connected, and the reverse input end of operational amplifier passes through the first end of first resistor connecting test interface, the base stage of the output end connecting triode of operational amplifier；The colelctor electrode of triode and the second end of test interface are connected, and the transmitting collection of triode passes through the first end of first resistor connecting test interface, also passes through capacity earth；Second end of adjustable resistance passes through the colelctor electrode of 0 Europe resistance connecting triode and the second end of test interface, the first end of the three-terminal link test interface of adjustable resistance；The three-terminal link power supply of test interface.The present invention, by adjusting the resistance of adjustable resistance, changes the actual resistance of test device, so as to meet the requirement of the test resistance of different annexes in the case where resistance is constant.
Description
Technical field
The present invention relates to a kind of resistance of mobile terminal test, the adjustable resistor type of more particularly to a kind of mobile terminal is tested
Device.
Background technology
At present when mobile phone and Mobile phone accessory are tested, different resistance values are often used.Such as carrying out charger survey
During examination, the resistance of some special resistances can be used, and these tests have certain want to the power and precision of this resistance
Ask.
In order to test, it is necessary to specially do some different test fixtures to adapt to the requirement of different resistance values, testing
Need constantly to change the resistance of resistance in journey, so as to cause often change test fixture, so have impact on the testing time, and
And be likely to influence measuring accuracy.
Thus prior art could be improved and improve.
The content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of adjustable resistance of mobile terminal
Formula test device, the resistance of test device can be adjusted as needed.
In order to achieve the above object, this invention takes following technical scheme：
A kind of adjustable resistor type testing device of mobile terminal, including test interface, operational amplifier, triode, first resistor,
0 Europe resistance and electric capacity；The first end of the positive input of operational amplifier and adjustable resistance is connected, operational amplifier it is reverse defeated
Enter first end of the end by first resistor connecting test interface, the base stage of the output end connecting triode of operational amplifier；Three poles
The colelctor electrode of pipe and the second end of test interface are connected, and the transmitting collection of triode passes through the first of first resistor connecting test interface
Hold, also pass through capacity earth；Second end of adjustable resistance pass through the colelctor electrode of 0 Europe resistance connecting triode and test interface
Two ends, the first end of the three-terminal link test interface of adjustable resistance；The three-terminal link power supply of test interface, test interface
4th end is grounded.
The adjustable resistor type testing device of described mobile terminal, wherein, the gain of the operational amplifier is more than 60db.
The adjustable resistor type testing device of described mobile terminal, wherein, the operational amplifier is negative using Voltage Series
Feedback model.
The adjustable resistor type testing device of described mobile terminal, wherein, triode is NPN triode.
The adjustable resistor type testing device for the mobile terminal that the present invention is provided, is to utilize test interface, adjustable resistance, computing
The active circuit that amplifier, triode, first resistor, 0 Europe resistance and electric capacity are built, the operational amplifier it is positive defeated
Enter end to be connected with the first end of the adjustable resistance, the reverse input end of operational amplifier connects described by the first resistor
The first end of test interface, the output end of operational amplifier connects the base stage of the triode；The colelctor electrode of the triode with
The second end connection of the test interface, the transmitting collection of triode by the first end of the first resistor connecting test interface,
Also pass through capacity earth；Second end of the adjustable resistance passes through the colelctor electrode of 0 Europe resistance connecting triode and test interface
Second end, the first end of the three-terminal link test interface of adjustable resistance；The three-terminal link power supply of the test interface, test
The 4th end ground connection of interface.In the case where resistance is constant, by adjusting the resistance of adjustable resistance, change test device
Actual resistance, so as to meet the requirement of the test resistance of different annexes, implementation is very simple, and the electricity of test device
Line structure is simple, and cost is low.
Brief description of the drawings
Fig. 1 is the circuit diagram of adjustable resistor type testing device of the present invention.
Embodiment
The present invention provides a kind of adjustable resistor type testing device of mobile terminal, is to utilize test interface, adjustable resistance, fortune
The active circuit that calculation amplifier, triode, first resistor, 0 Europe resistance and electric capacity are built, the adjustable resistor type testing device
The electrical characteristic embodied is resistance.
That is, the adjustable resistor type testing device can be used as a resistance, and the adjustable resistor type
The output resistance of test device only need to can just reach modification test device by changing the parameter of the adjustable resistance in circuit
The purpose of resistance value.The adjustable resistor type testing device of mobile terminal of the present invention can be used needs the field of different resistance various
Close, and regulative mode is very simple.
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, referring to the drawings and give an actual example to this
Invention is further described.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention
The fixed present invention.
Referring to Fig. 1, adjustable resistor type testing device of the present invention includes a housing（Not shown in figure）, in the housing
It is provided with test interface J1, adjustable resistance RV1, operational amplifier A 1, triode Q1, first resistor R3,0 Europe resistance R01 and electricity
Hold C1.
Wherein, adjustable resistance RV1 includes three terminals, respectively first end a, the second end b and the 3rd end c, and can
Adjusting resistance RV1 resistance can select larger, for example, 100 kilohms, and the resistance that adjustable resistance RV1 is inputted in circuit can be with
Regulation as needed.
In the present embodiment, it is assumed that the 3rd end c of adjustable resistance in some intermediateness of adjustable resistance, its top
Resistance is R1, and the resistance of bottom is R2.
The operational amplifier A 1 is Differential Input, the amplifier of Single-end output, its positive input and the adjustable resistance
RV1 first end a connections, the reverse input end of operational amplifier A 1 passes through the first resistor R1 connections test interface J1
First end, the output end of operational amplifier A 1 connects the base stage of the triode Q1.
The colelctor electrode of the triode Q1 is connected with the second end of the test interface J1, and triode Q1 transmitting collection passes through
The first end of the first resistor R01 connecting test interfaces J1, also it is grounded by electric capacity C1；The second of the adjustable resistance RV1
End b passes through 0 Europe resistance R01 connecting triodes Q1 colelctor electrode and test interface J1 the second end, adjustable resistance RV1 the 3rd end
C connecting test interfaces J1 first end；The three-terminal link power Vcc of the test interface J1, test interface J1 the 4th end
Ground connection.
It should be noted that test interface J1 is conventional test interface, to each wiring in the test interface in accompanying drawing
The index order at end is not offered as the order of each terminals.
The circuit operation principle of the adjustable resistor type testing device of mobile terminal of the present invention is described in detail below：
In the circuit, triode Q1 mainly plays on-off action in circuit, and it uses NPN（The model of triode）Triode,
Also, the current direction first resistor R3 of transistor emitter and the reverse input end of operational amplifier A 1.0 Europe resistance R01 its
Resistance is 0 ohm, mainly plays buffer action, it is ensured that stable testing is leaned on, the electric capacity C1 strobes, and can likewise ensure that survey
Examination is stable to lean on.
Operational amplifier A 1 uses series voltage negtive backword pattern, and its gain is more than 60db（Decibel, decibel）, that is, put
Big multiple is more than 1000 times.So, the operational amplifier A 1 that the present embodiment is used is ideal operational amplifier, and its characteristic is：Times magnification
Number is infinitely great, and input impedance is infinitely great.
The voltage of the positive input of operational amplifier A 1 is by adjustable resistance RV1 partial pressures（That is R2 voltage-to-ground）,
Pressure drop of the voltage of the reverse input end of operational amplifier A 1 on first resistor R3, and the voltage of reverse input end is anti-
Feedthrough voltage.So the voltage difference of the positive input of operational amplifier A 1 and reverse input end be adjustable resistance RV1 on partial pressure with
The difference of pressure drop on first resistor R3, it is assumed that be, the multiplication factor of operational amplifier A 1 is A（A>1000）, therefore operation amplifier
Device A1 output end driving triode Q1 voltage is that the maximum of the voltage is the operating voltage Vcc of operational amplifier A 1（Cause
The operating voltage that maximum voltage, i.e. saturation voltage are operational amplifier is exported for operational amplifier A 1）.
Therefore, it is possible to obtain；Again because the multiplication factor A of operational amplifier A 1 is more than 1000, and its multiplication factor is unusual
Greatly, it is thus very small, it can be ignored.Therefore the voltage of the positive input of operational amplifier A 1 is eventually reversely defeated with it
The voltage for entering end is equal.
According to above-mentioned principle, pressure drops of the adjustable resistance RV1 on R2 is that the electric current that the voltage is eventually equal to triode Q1 exists
Pressure drop on R3 is；
I.e.：…………………………
By formulaIt can obtain：…………………………
It is assumed that the actual impedance of the adjustable resistor type testing device of mobile terminal is RX（The resistance value entered from Fig. 1 in terms of Rx ends
For the practical impedance representated by whole circuit）, and ... ...,
By formulaSubstitute into formulaIn, thus have ... ... ... ... ...。
FormulaIn, the resistance value calculated is the actual resistance for the adjustable resistor type testing device entered in terms of Rx ends
Value.
By formulaAs can be seen that in the case where first resistor R3 is fixed, as long as the value in modification adjustable resistance RV1, just
The resistance that can change, so as to reach the purpose for changing resistance.
In summary, the adjustable resistor type testing device for the mobile terminal that the present invention is provided, in the feelings that resistance is constant
Under condition, by adjusting the resistance of adjustable resistance, change the actual first resistor value of test device, so as to meet the survey of different annexes
The requirement of resistance is tried, and implementation is very simple, is adapted to use in the test occasion that various needs switch different resistance.
It is understood that for those of ordinary skills, can be with technique according to the invention scheme and its hair
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect scope.
Claims (4)
1. a kind of adjustable resistor type testing device of mobile terminal, including test interface and adjustable resistance, it is characterised in that also wrap
Include operational amplifier, triode, first resistor, 0 Europe resistance and electric capacity；The positive input of the operational amplifier with it is described can
Adjust the first end connection of resistance, the reverse input end of operational amplifier connects the of the test interface by the first resistor
One end, the output end of operational amplifier connects the base stage of the triode；The colelctor electrode of the triode and the test interface
The connection of the second end, the transmitting collection of triode by electric capacity by the first end of the first resistor connecting test interface, also connect
Ground；Second end of the adjustable resistance passes through the colelctor electrode of 0 Europe resistance connecting triode and the second end of test interface, adjustable electric
The first end of the three-terminal link test interface of resistance；The three-terminal link power supply of the test interface, the 4th end of test interface
Ground connection.
2. the adjustable resistor type testing device of mobile terminal according to claim 1, it is characterised in that the operation amplifier
The gain of device is more than 60db.
3. the adjustable resistor type testing device of mobile terminal according to claim 1, it is characterised in that the operation amplifier
Device uses series voltage negtive backword pattern.
4. the adjustable resistor type testing device of mobile terminal according to claim 1, it is characterised in that triode is NPN
Triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100820.7A CN107121576A (en) | 2016-02-24 | 2016-02-24 | A kind of adjustable resistor type testing device of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610100820.7A CN107121576A (en) | 2016-02-24 | 2016-02-24 | A kind of adjustable resistor type testing device of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107121576A true CN107121576A (en) | 2017-09-01 |
Family
ID=59717643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610100820.7A Pending CN107121576A (en) | 2016-02-24 | 2016-02-24 | A kind of adjustable resistor type testing device of mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107121576A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884604A (en) * | 2017-12-14 | 2018-04-06 | 池州职业技术学院 | A kind of optoelectronic switch break-make level sensitive circuit |
| CN113219316A (en) * | 2021-05-18 | 2021-08-06 | 北京轩宇空间科技有限公司 | Triode amplification factor test circuit based on negative feedback |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362684B1 (en) * | 2000-02-17 | 2002-03-26 | Lattice Semiconductor Corporation | Amplifier having an adjust resistor network |
| CN102253259A (en) * | 2010-07-30 | 2011-11-23 | 惠州Tcl移动通信有限公司 | Adjustable resistance type testing device for mobile terminal |
-
2016
- 2016-02-24 CN CN201610100820.7A patent/CN107121576A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6362684B1 (en) * | 2000-02-17 | 2002-03-26 | Lattice Semiconductor Corporation | Amplifier having an adjust resistor network |
| CN102253259A (en) * | 2010-07-30 | 2011-11-23 | 惠州Tcl移动通信有限公司 | Adjustable resistance type testing device for mobile terminal |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884604A (en) * | 2017-12-14 | 2018-04-06 | 池州职业技术学院 | A kind of optoelectronic switch break-make level sensitive circuit |
| CN107884604B (en) * | 2017-12-14 | 2024-04-05 | 池州职业技术学院 | Photoelectric switch on-off level detection circuit |
| CN113219316A (en) * | 2021-05-18 | 2021-08-06 | 北京轩宇空间科技有限公司 | Triode amplification factor test circuit based on negative feedback |
| CN113219316B (en) * | 2021-05-18 | 2022-10-14 | 北京轩宇空间科技有限公司 | Triode amplification factor test circuit based on negative feedback |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103560760B (en) | Amplifying circuit and measuring device | |
| CN104106269B (en) | Circuit for the loudspeaker of portable set | |
| US4061932A (en) | Window comparator | |
| CN103424580A (en) | Electronic load | |
| CN107121576A (en) | A kind of adjustable resistor type testing device of mobile terminal | |
| US4185211A (en) | Electrical circuits | |
| GB845281A (en) | Improvements in or relating to transistor circuit arrangements for converting impedances | |
| CN104635052B (en) | Apply the on-off circuit in electromagnetic relay contact resistance test equipment | |
| CN109164290B (en) | Suspension voltage sampling circuit and method | |
| US6204647B1 (en) | Battery emulating power supply | |
| CN104280679B (en) | High speed operation amplifier test circuit based on FLEX | |
| CN211878070U (en) | Test module | |
| CN102955070A (en) | Resistance measuring circuit | |
| CN214335032U (en) | Program-controlled composite voltage current source circuit | |
| CN108693912A (en) | With the band-gap reference circuit for being inverted band gap pair | |
| CN106018916B (en) | A kind of switch pressure drop can configure current detecting accurately power switch circuit structure | |
| US20070103187A1 (en) | Impedance circuit, power supply device | |
| CN111010021B (en) | Load line circuit and electronic equipment | |
| CN102253259B (en) | Adjustable resistance type testing device for mobile terminal | |
| CN211928867U (en) | Middle school magnetic bioelectricity physical experiment device | |
| CN108267640B (en) | Single-power-supply resistance measuring device | |
| CN102496360A (en) | Music drive circuit | |
| CN212811640U (en) | Multifunctional amplifier | |
| CN216696585U (en) | Lithium battery high-voltage constant-current detection circuit | |
| CN212115425U (en) | Fatigue testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170901 |