CN202384240U - Liquid starter and detection equipment comprising same - Google Patents
Liquid starter and detection equipment comprising same Download PDFInfo
- Publication number
- CN202384240U CN202384240U CN201120542934XU CN201120542934U CN202384240U CN 202384240 U CN202384240 U CN 202384240U CN 201120542934X U CN201120542934X U CN 201120542934XU CN 201120542934 U CN201120542934 U CN 201120542934U CN 202384240 U CN202384240 U CN 202384240U
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- contact
- liquid
- activated device
- output port
- resistance
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Abstract
The utility model relates to a liquid starter and detection equipment comprising the same; the liquid starter comprises an input port which is connected to an output pin of the equipment applying the starter, an output port which is connected to a detection pin of the equipment applying the starter, a first resistor (R1) which is arranged between the input port and the output port, an electronic switch which automatically connects or disconnects the grounding connecting end of the output port, and a first start contact and a second start contact which are contacted with both ends of the test piece of the equipment and are connected through liquid for power conduction; the first start contact is grounded through a second resistor (R3), and the second start contact is connected to the input port through a third resistor (R4), wherein when the first and the second start contacts are connected through the liquid for power conduction and the voltage of the first start contact is boosted to a regulated value, the electronic switch automatically connects the grounding connecting end of the output port.
Description
Technical field
The utility model relates to a kind of liquid activated device that is used to make device start work, and comprises this liquid activated Device Testing equipment.
Background technology
At present, a lot of liquid checkout equipments or device all can be provided with an independently switch, are used to start this checkout equipment and detect beginning.The setting of this independent switch has not only increased manufacturing cost, and this checkout equipment is started working at Best Times, thereby can cause power wastage.And for portable each class I liquid I checkout equipment or device, power consumption is particularly important.
In addition, some liquid checkout equipments are arranged also on the market, use the testing liquid that imports to start the built-in single-chip microcomputer of this checkout equipment, and then carry out testing through this single-chip microcomputer.Checkout gear like Chinese patent CN200820084258.4 record; Two metal contacts that comprise strip (sample pad) both sides that lay respectively at this checkout gear; When between these two metal contacts during liquid communication, the two metal sheets short circuit, circuit is connected; Drive the program circuit on the pcb board of this checkout gear, wake single-chip microcomputer up and start working.
For example; The schematic diagram of the start unit in this checkout gear is as shown in Figure 1, and this start unit is used in two pins (the first pin Pin9 and the second pin Pin10) of single-chip microcomputer, and the first pin Pin9 is an output pin; The output high level is set; For example about 3V, the second pin Pin10 is for detecting pin, and it passes through capacitor C
2Ground connection.This start unit comprises respectively the first metal contact PAD1 and the second metal contact PAD2 with two end in contact of the strip of the checkout gear of using this start unit: wherein; The second metal contact PAD2 is arranged between the first pin Pin9 and the second pin Pin10, between the first pin Pin9 and the second metal contact PAD2, is provided with resistance R
2(5.1M Ω) and between the second pin Pin10 and the second metal contact PAD2, be provided with resistance R
1(1K Ω), here R
1Only play metering function; The first metal contact PAD1 then passes through resistance R
3(1K Ω) ground connection.
Usually, when not adding liquid to be detected, metal contact PAD1 and PAD2 open circuit, also the no current R that flows through
2And R
1, this moment, the voltage at the second pin Pin10 and the second metal contact PAD2 place also was high level (about 3V).And after adding liquid to be detected; Pass through the liquid conducting at two metal contact PAD1 and PAD2; (during connection, start unit circuit theory reduced graph is as shown in Figure 2, makes the electric current I R that flows through to connect circuit between two metal contact PAD1 and PAD2, to form resistance (being designated hereinafter simply as Rs)
2, sample pad (Rs) and R
3).Because the electric current R that flows through is arranged
2, the voltage (U at the second pin Pin10 and the second metal contact PAD2 place
2) (voltage (the U at the first pin Pin9 place descends
1) deduct R
2The pressure drop that produces), as testing liquid application of sample amount U after a certain amount of
2The second pin Pin10 level generation trailing edge saltus step when dropping to about 0.9V, wake-up device this moment (single-chip microcomputer) work.Make U2 less than 0.9V, Rs should satisfy:
U
2=U
1-IR
2<0.9V formula 1.;
U
2=I (R
3+ Rs)<0.9V formula 2.;
1. 2. can get with formula based on above-mentioned formula,
Rs<0.9V/> [(U
1-0.9V)/R
2]-R
3Formula 3.;
Rs < 0.9V/> [(3-0.9V)/5.1 M Ω]-1K Ω ≈ 2.18 M Ω promptly.
There is following shortcoming in this liquid activated unit:
1. 1. 2. can know the voltage (U on the second pin Pin10 of single-chip microcomputer with formula according to above-mentioned formula
2) can change with the variation of liquid application of sample amount (Rs), be analog signal, so its poor anti jamming capability;
2. drop to 0.3 VDD (about 0.9 volt) when following from VDD (about 3 volts) when the voltage of this second pin Pin10, wake the single-chip microcomputer of checkout gear up and start working.Because of 1 of resistance R plays current limliting, so the voltage of the second pin Pin10 is identical with metal contact PAD2, promptly, when the voltage of metal contact PAD2 during, wake single-chip microcomputer up less than 0.9 volt, this moment according to above-mentioned formula 3., Rs < 2.18 M Ω;
By on can know the starting resistance of this liquid activated unit, promptly Rs (less than 2.18 M Ω) is less relatively, needs big (solution amount need more than about 50ul) so start solution amount accordingly, therefore required start-up time is also just longer.
It is thus clear that not only liquid application of sample amount demand is big for the liquid activated unit in this checkout gear, and the voltage that detects pin can change with the variation of application of sample amount, so jitter, poor anti jamming capability.
The utility model content
In order to overcome the above problems, the purpose of the utility model be to provide a kind of can make required liquid application of sample amount few, start liquid activated device fast, stable performance, and comprise this liquid activated Device Testing equipment.
According to the one side of the utility model, a kind of liquid activated device is provided, comprise the input port of the output pin that is connected to the equipment of using this starting drive; Be connected to the output port of the equipment testing pin of using this starting drive; Be arranged at first resistance between said input port and the said output port; Be used for being switched on or switched off automatically the electronic switch that the ground connection of said output port connects; Can be connected first of conduction through liquid with two end in contact of the strip of said equipment respectively starts contact and second and starts contact; Wherein, Said first starts contact through second grounding through resistance, and said second starts contact is connected to said input port through the 3rd resistance; Wherein, start contact and said second and start contact and is connected conduction when said first by liquid, and make said first start the contact place voltage when rising to setting, said electronic switch is the ground connection connection of the said output port of connection automatically.
The liquid activated device of the utility model, the ground connection of using electronic switch to be switched on or switched off said output port automatically connects, and said input port receives the high level from said output pin; When not adding liquid, first and second start contact opens circuit, and the voltage that the voltage of output port and second starts the contact place also is high level; And this moment, the voltage at the first startup contact place then is 0V, and said electronic switch fails to start; After adding liquid, first and second start contact through the liquid conducting, along with the increase of amount of liquid; Two start the resistance between the contact; The voltage at the said first startup contact place rises to setting after its resistance is lower than certain degree, and the ground connection that makes said electronic switch connect said output port automatically connects, and is delivered to said equipment testing pin thereby produce a low level signal.Said Equipment Inspection is promptly waken up to the level generation trailing edge saltus step on this detection pin.The liquid activated device of the utility model can join the moment of equipment such as checkout gear at liquid, and equipment is started working.Both practice thrift power consumption, do not influenced the operate as normal of equipment again.And because the voltage on this detection pin has only two states, low level or high level are digital signal, so its antijamming capability is strong.
In the utility model, said electronic switch comprises FET.
Adopt the utility model; Output port is switched on or switched off through FET realization and ground connection automatically, and when this FET started, output port ground connection connected; Its voltage drops to 0V, thereby makes Equipment Inspection to the level generation trailing edge saltus step that detects on the pin.
In the utility model, said FET is a N channel enhancement FET.
In the utility model, N channel enhancement FET noise is little, low in energy consumption, is easy to integratedly, and owing to only needs very little voltage (for example 1～2.5V) can open, therefore only need less amount of liquid just can realize the startup of equipment.
In the utility model, said setting is 1V.
In the utility model; When the voltage at the said first startup contact place rises to 1V; The ground connection that said electronic switch is automatically connected said output port connects, and therefore can start resistance between contacts unlocking electronic switch when big two, has reduced the amount of liquid that adds.
The liquid activated device of the utility model also comprises the current-limiting resistance that is arranged between said electronic switch and the said first startup contact.
In the utility model, first starts contact is connected to electronic switch through current-limiting resistance, because this current-limiting resistance only plays metering function, so can open this electronic switch during greater than setting when the voltage of the first startup contact.
The liquid activated device of the utility model also comprises and is arranged between said output port and the ground connection and first electric capacity parallelly connected with said electronic switch.
In the utility model, said first electric capacity can be used for storage of electrical energy.
The liquid activated device of the utility model comprises that also being arranged at said first starts between contact and the ground connection and second electric capacity parallelly connected with said second resistance.
In the utility model, said second electric capacity can be used for storage of electrical energy.
According to the utility model on the other hand, also provide and comprised aforesaid liquid activated Device Testing equipment.
This checkout equipment, it is convenient to start, and strong interference immunity, and can reduce the use amount of testing liquid.
In the utility model, said checkout equipment comprises single-chip microcomputer.
Adopt single-chip microcomputer, program-controlled property is strong, low in energy consumption, and is easy to be used in combination with the liquid activated device of the utility model.
Description of drawings
Fig. 1 is the schematic diagram of liquid activated device of the prior art;
Fig. 2 is the principle reduced graph of liquid activated device shown in Figure 1 when connecting;
Fig. 3 is the schematic diagram of the liquid activated device of example of the utility model;
Fig. 4 is the principle reduced graph of liquid activated device shown in Figure 3 when connecting;
Fig. 5 is the workflow sketch map of the liquid activated device of the utility model;
Fig. 6 is the sketch map that comprises the part of the liquid activated Device Testing device of the utility model;
Fig. 7 is the sketch map that the contact of the liquid activated device of the utility model contacts with strip.
Embodiment
Be elaborated below in conjunction with the liquid activated device of accompanying drawing to the utility model.
Adopt the liquid activated device of the utility model; After importing fluid sample to checkout gear; Need not any independently switch, can start through the liquid that imports, wake single-chip microcomputer up and get into operating state; And then detect, judge, work of treatment such as analysis, easy to operate and can reduce manufacturing cost.
Fig. 3 shows the schematic diagram of the example embodiment of the liquid activated device of the utility model.This liquid activated device is connected in treats starting device, and for example single-chip microcomputer (not shown) is used for single-chip microcomputer is started, and said single-chip microcomputer can be any suitable commercially available single-chip microcomputer, for example can select STM8L 101 single-chip microcomputers etc. for use.This liquid activated device has the input port 1 and output port 2 of two pins that are connected to single-chip microcomputer; The input port 1 of this liquid activated device is connected in the illustrated single-chip microcomputer first pin Pin9; The output port 2 of this liquid activated device then is connected in second pin (detection pin) Pin10 of single-chip microcomputer; Wherein the first pin Pin9 is an output pin, the output voltage (U of this first pin Pin9
1) be set to high level (for example about 3V), and the second pin Pin10 is an input pin, and have the external interrupt function.Between input port 1 and output port 2, resistance R is set
1(R in one example
1Be 200K Ω).
Referring to Fig. 6 and 7, this liquid activated device comprise respectively can with the metal contact (first starts contact PAD1 and second starts contact PAD2) of 3 liang of end in contact of strip of the checkout gear of using this starting drive.Second starts contact PAD2 passes through resistance R
4(R in one example
4Be 1K Ω) be connected to input port 1.Output port 2 is through FET Q1 ground connection, and promptly when field effect pipe Q1 started, output port 2 ground connection connected, its voltage U
2Drop to 0V.First starts contact PAD1 passes through resistance R
3(R in one example
3Be 2.7M Ω) ground connection.Usually, not when strip (sample pad) is gone up interpolation liquid (liquid for example to be detected), the first startup contact PAD1 and second starts contact PAD2 and opens circuit, at this moment voltage (the U of output port 2
2) and second start contact PAD2 place voltage also be high level (about 3V), and at this moment, the voltage at FET Q1 place and the first startup contact PAD1 voltage (U of place
3) then be 0V, fail to start FET Q1 this moment.In one example, FET Q1 is a N channel enhancement FET (N-channel enhancement mode field effect transistor), 2N7002 for example, and it only needs very little voltage (for example 1～2.5V) can open.In one example, first starts contact PAD1 through current-limiting resistance R
2(R in one example
2Be 1K Ω) be connected to FET Q1, because R
2Only play metering function, can open FET Q1 greater than 1V so work as the voltage of the first startup contact PAD1.
When after adding liquid on the sample pad; Two start contact PAD1 and pass through the liquid conducting with PAD2; Start at two and to form resistance (being designated hereinafter simply as Rs) between contact PAD1 and the PAD2 (during connection, the circuit theory reduced graph of this starting drive is as shown in Figure 4, makes the electric current I R that flows through to connect circuit
4, sample pad (Rs) and R
3).Because the electric current R that flows through is arranged
3, first starts no longer directly ground connection of contact PAD1, i.e. the voltage (U here
3) be R
3Pressure drop (the U promptly, that produces
3=IR
3), when liquid application of sample amount makes U after a certain amount of
3Rise to about 1V and open FET Q1, this moment, output port 2 was through FET Q
1Direct ground connection becomes the low level of 0V, and at this moment single-chip microcomputer detects the trailing edge saltus step of the detection pin Pin10 that links to each other with output port 2, can be by the work of waking up.
In preferred example, can be respectively between output port and the ground connection and first start that the configuration capacitor C is used for storage of electrical energy between contact PAD1 and the ground connection, electric capacity can the employing capacity be the electric capacity of 10nF.
FET Q1 comprises drain electrode (D), source electrode (S) and grid (G), and drain electrode (D) links to each other with output port 2, source electrode (S) ground connection, and grid (G) is through current-limiting resistance R
2Link to each other with the first startup contact PAD1; Adopting N channel enhancement FET to switch on and off output port 2 as electronic switch here is connected with ground connection; Adopting the reason of FET is that FET is a voltage controlled element; Its drive current less (the chances are triode 5% ~ 30%) so that it opens loss is low, plays energy-conservation effect.But should be understood that any electronics on-off action that can rise all is suitable for the structure that switches on and off output port 2 and be connected with ground connection.
Referring to Fig. 6 and Fig. 7, the testing liquid sample can import through well shown in Figure 64, for example imports on the sample pad 5 of a side that is arranged at strip 3, and the testing liquid sample of importing can contact with strip with the startup contact.After the certain amount of fluid sample imports well 4, this fluid sample be connected above-mentioned two when strip reacts and start contacts.Because the conductivity of liquid, formed the conduction between these two the original startup contacts that break off, two of disconnection start between contacts and have certain resistance (being about the megohm level), are equivalent to form a conductive resistance Rs.Increase along with the fluid sample amount that imports; Resistance R s between the two startup contacts diminishes;, its resistance make the voltage at the first startup contact PAD1 place rise to 1V after being lower than certain degree; And then as above-mentionedly open FET Q1, thereby make output port 2 produce low level signals, be sent to the second pin Pin10 of single-chip microcomputer.Single-chip microcomputer receives this low level signal through the second pin Pin10; Will be waken up the entering operating state by this low level signal, drive other modules, for example detecting unit etc.; Begin the reaction that takes place on the strip is detected, and then detected data are carried out analyzing and processing.
Analysis according to the front can be known, wants to let FET Q1 open, and must make the voltage (U at PAD1 place
3) greater than 1V, referring to principle reduced graph shown in Figure 4, Rs should satisfy:
U
3=U
1-I (R
4+ Rs)>The 1V formula 4.;
U
3=IR
3>The 1V formula 5.;
4. 5. can get with formula based on above-mentioned formula,
Rs<(U
1-1V)/(1V/R
3)-R
4Formula 6.;
Promptly, Rs (3V-1V)/(1V/2.7 M Ω)-1K Ω ≈ 5.4 M Ω.
It is thus clear that compared with prior art, the starting resistance Rs of the liquid activated device of the utility model (5.4 M Ω) is bigger, so corresponding required startup solution amount less (solution amount 20ul gets final product start-up circuit), required start-up time is also just shorter.
In addition, as above-mentioned, the voltage of the second pin Pin10 of the single-chip microcomputer that links to each other with output port 2 has only two states, and low level (0 volt) or high level (3 volts) are digital signal, so its antijamming capability is strong.
The concrete workflow of the liquid activated device of the utility model is as shown in Figure 5.Under initial condition; When promptly not adding fluid sample, open circuit between the first startup contact PAD1 and the second startup contact PAD2, and the output of the first pin Pin9 is made as high level; This moment, circuit broke off; The no current circuit of flowing through, the second pin Pin10 that therefore links to each other with output port also are high level, and this high level charges for capacitor C 1.After adding the certain amount of fluid sample; When this fluid sample and strip react; Because the conductivity of liquid, conducting starts contact PAD1, PAD2, after the resistance between startup contact PAD1, the PAD2 is reduced to a certain degree; FET Q1 opens, and produces a low level signal and is delivered to the second pin Pin10.The level generation trailing edge saltus step that single-chip microcomputer detects on the second pin Pin10 is promptly waken up, gets into and interrupts, and other functional modules of detection starting device begin to carry out each item work, for example detection, data judgement, processing etc.
The liquid activated device of the utility model adopts single-chip microcomputer to carry out all kinds of checkout gears or the equipment of work such as detection or chemical examination applicable to using liquid (so-called liquid for example can be saliva, blood or various secretion) as sample.
Claims (9)
1. a liquid activated device is characterized in that, comprising:
Be connected to the input port of the output pin of the equipment of using this starting drive;
Be connected to the output port of the equipment testing pin of using this starting drive;
Be arranged at first resistance between said input port and the said output port;
Be used for being switched on or switched off automatically the electronic switch that the ground connection of said output port connects;
Can be connected first of conduction through liquid with two end in contact of the strip of said equipment respectively starts contact and second and starts contact; Wherein, Said first starts contact through second grounding through resistance, and said second starts contact is connected to said input port through the 3rd resistance;
Wherein, start contact and said second and start contact and is connected conduction when said first by liquid, and make said first start the contact place voltage when rising to setting, said electronic switch is the ground connection connection of the said output port of connection automatically.
2. liquid activated device according to claim 1 is characterized in that said electronic switch comprises FET.
3. liquid activated device according to claim 2 is characterized in that, said FET is a N channel enhancement FET.
4. liquid activated device according to claim 3 is characterized in that, said setting is 1V.
5. liquid activated device according to claim 1 is characterized in that, also comprises being arranged at the current-limiting resistance that said electronic switch and said first starts between the contact.
6. liquid activated device according to claim 1 is characterized in that, also comprises being arranged between said output port and the ground connection and first electric capacity parallelly connected with said electronic switch.
7. liquid activated device according to claim 1 is characterized in that, comprises that also being arranged at said first starts between contact and the ground connection and second electric capacity parallelly connected with said second resistance.
8. a checkout equipment is characterized in that comprising each described liquid activated device in the claim 1～7.
9. checkout equipment according to claim 8 is characterized in that said checkout equipment comprises single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120542934XU CN202384240U (en) | 2011-12-22 | 2011-12-22 | Liquid starter and detection equipment comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120542934XU CN202384240U (en) | 2011-12-22 | 2011-12-22 | Liquid starter and detection equipment comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202384240U true CN202384240U (en) | 2012-08-15 |
Family
ID=46632726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120542934XU Expired - Fee Related CN202384240U (en) | 2011-12-22 | 2011-12-22 | Liquid starter and detection equipment comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202384240U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554173A (en) * | 2019-09-23 | 2019-12-10 | 三诺生物传感股份有限公司 | Blood glucose meter device |
| CN110632285A (en) * | 2019-09-23 | 2019-12-31 | 三诺生物传感股份有限公司 | Blood glucose meter device |
-
2011
- 2011-12-22 CN CN201120542934XU patent/CN202384240U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110554173A (en) * | 2019-09-23 | 2019-12-10 | 三诺生物传感股份有限公司 | Blood glucose meter device |
| CN110632285A (en) * | 2019-09-23 | 2019-12-31 | 三诺生物传感股份有限公司 | Blood glucose meter device |
| CN110554173B (en) * | 2019-09-23 | 2020-12-08 | 三诺生物传感股份有限公司 | Blood glucose meter device |
| CN110632285B (en) * | 2019-09-23 | 2022-09-06 | 三诺生物传感股份有限公司 | Blood glucose meter device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20191222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |