CN104993695A - Bias circuit capable of improving charge collection efficiency of pole plate - Google Patents
Bias circuit capable of improving charge collection efficiency of pole plate Download PDFInfo
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- CN104993695A CN104993695A CN201510466895.2A CN201510466895A CN104993695A CN 104993695 A CN104993695 A CN 104993695A CN 201510466895 A CN201510466895 A CN 201510466895A CN 104993695 A CN104993695 A CN 104993695A
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Abstract
The invention discloses a bias circuit capable of improving the charge collection efficiency of a pole plate, and relates to the technical field of circuit design. The bias circuit is characterized in that W7805 is an integrated serial voltage stabilizer which is a three-terminal integrated voltage stabilizing device with the output voltage being 5V. The integrated serial voltage stabilizer is provided with three pins in total, wherein the pin 1 is an input terminal, the pin 2 is an output terminal, and the pin 3 is a voltage regulating terminal which is called a regulating terminal in short. The bias circuit adopts a MAX641 chip produced by a MAXIM company in America, wherein the MAX641 chip is a step-up DC-DC converter and is also a CMOS constructed external pressure switching voltage stabilizer. The power consumption is low, and the input and output range is wide. The bias circuit provided by the invention can adjust output voltage of the MAX641 chip.
Description
Technical field
The present invention relates to technical field of circuit design, be specifically related to a kind of biasing circuit improving the efficiency of pole plate collection electric charge.
Background technology
So-called ionization is exactly force gas to be measured " division " with the energy greater than or equal to gas to be measured, the electron excitation in gas to be measured out, each part of " division " is with corresponding electric charge, in PID, excite the source of gas ionization to be measured to be exactly uviol lamp in ionization chamber, when the IP value of gas to be measured exports energy less than or equal to uviol lamp, gas molecule Absorbable rod photon to be measured ionizes, result after ionization is the ion forming positively charged, ejected electron, the battery lead plate connecting high voltage source is equipped with in ionization chamber, electronics after ionization and ion are through this battery lead plate, due to the effect of extra electric field, ion and electronics are moved rapidly, the low current signal that can be detected is formed between two pieces of pole plates.
In order to the collection efficiency of the sensitivity and pole plate collection of ions galvanic current signal that improve PID, the overall volume of ionization chamber is unsuitable excessive, in addition, inlet/outlet for gas circulation to be measured should ensure that air-flow is unobstructed, improve the collection efficiency of passive electrode, from Gauss theorem: when the area of collecting plate increases, collected electric charge increases thereupon, in other words, in theory, the area of collecting plate is larger, ionization current is larger, the sensitivity of ionization chamber is also higher, ion total charge dosage is directly proportional to measurement volumes, namely measurement volumes is larger, the total amount of electric charge produced in ionization process is larger.But actual conditions with theory analysis and non-fully conform to, gas to be measured can not as desired in theory completely collected by pole plate at the ion produced in ionization process in ionization chamber, but negative ions there occurs compound phenomenon in ion displacement process, thus decrease the collection efficiency of electrode.
From Boag theory, the collection efficiency of pole plate is:
f＝(1+ξ
2/6)
-1＝(1+m
2·d
4·q·/6V
2)
-1
In formula: ξ=md
2q
0.5/ V
D---positive and negative electrode spacing
V---voltage across poles
The ionization rate of q---air
M---temperature, air pressure correction factor
From formula, the distance d that pole plate is collected between the efficiency f of electric charge and positive and negative polarities plate is inversely proportional to, that is, polar plate spacing is from larger, the collection efficiency of pole plate is less, and in addition, the efficiency that electric charge collected by pole plate is also directly proportional to bias voltage, can reach a conclusion thus, the collection efficiency of pole plate is improved by strengthening voltage across poles (i.e. bias voltage).
Summary of the invention
The object of this invention is to provide a kind of biasing circuit improving the efficiency of pole plate collection electric charge, the output voltage of its adjustable MAX641 chip.
In order to solve the problem existing for background technology, the present invention is by the following technical solutions: improve the biasing circuit that the efficiency of electric charge collected by pole plate, it is characterized in that wherein W7805 is integrated series type pressurizer, be the integrated output voltage of three ends be 5V voltage-stabilizing device, have three pins, wherein 1 pin is input, 2 pin are output, 3 pin are Voltage Cortrol end (being called for short adjustment end), W7805 output voltage is 5V, maximum output current is 1.5A, easily inductive effect is caused when input line is longer, therefore electric capacity C7 is adopted to offset inductive effect, avoid self-oscillation occurs, electric capacity C6 then can suppress the high-frequency noise in output voltage, wherein adopt the MAX641 chip that MAXIM company of the U.S. produces, it is a kind of step-up DC ~ DC converter, also be the external pressure switching regulator that a kind of CMOS constructs, low in energy consumption, input and output wide ranges, application MAX641 chip not only can provide fixing+5V direct-flow steady voltage for circuit, the direct voltage of output can also be changed by connecting peripheral components, the outstanding advantage of MAX641 chip is that the peripheral components needed for it is few, and chip entirety is small and exquisite, is applicable to make portable instrument.
Accompanying drawing illustrates:
Fig. 1 is structural representation of the present invention.
Embodiment
With reference to Fig. 1, wherein W7805 is integrated series type pressurizer, be the integrated output voltage of three ends is 5V voltage-stabilizing device, have three pins, wherein 1 pin is input, and 2 pin are output, and 3 pin are Voltage Cortrol end (being called for short adjustment end), W7805 output voltage is 5V, maximum output current is 1.5A, easily causes inductive effect when input line is longer, therefore adopts electric capacity C7 to offset inductive effect, avoid self-oscillation occurs, electric capacity C6 then can suppress the high-frequency noise in output voltage.
The MAX641 chip that MAXIM company of the U.S. produces is adopted in biasing circuit, it is a kind of step-up DC ~ DC converter, also be the external pressure switching regulator that a kind of CMOS constructs, low in energy consumption, input and output wide ranges, application MAX641 chip not only can provide fixing+5V direct-flow steady voltage for circuit, the direct voltage of output can also be changed by connecting peripheral components, the outstanding advantage of MAX641 chip is that the peripheral components needed for it is few, and chip entirety is small and exquisite, be applicable to make portable instrument, MAX641 chip has eight pins, the function of each pin is:
The full name of 1 pin LBI:LBI is Low Battery Input, and obviously, this pin is that low battery voltages detects input;
The full name of 2 pin LBO:LBO is Low Battery Output, corresponding with 1 pin, this pin is that low battery voltages detects output, in application process, the threshold value of low battery detector is 1.31V, if the voltage on 1 pin LBI is lower than this threshold value, 2 pin just can export the signal that battery is changed in a warning;
3 pin GND: earth terminal;
4 pin LX: when carrying out low-voltage conversion, this pin can drive the N-type power MOSFET of external inductance and MAX641 chip internal, and therefore require that this pin output resistance is 6 Ω, peak current rating is 450mA;
5 pin VOUT: when applying the N-type power MOSFET of MAX641 chip internal, the output voltage of the adjustable DC ~ DC converter of this pin, when applying the diode of MAX641 chip exterior, this pin can be used as the input of supply voltage;
6 pin EXT: this pin is for driving external power MOSFET or bipolar transistor, and this pin and 4 pin LX are closely related: when 4 pin LX are unsettled, EXT is low level; When 4 pin LX connect, EXT is high level;
7 pin VFB: this pin, as pressure feedback port, plays regulatory role output voltage, when this pin ground connection, MAX641 chip exports+5V direct current fixed voltage, and when this pin connects external voltage voltage divider, then output voltage is adjustable;
8 pin COMP: this pin is as the voltage compensation end of MAX641 chip, and when this pin is connected to builtin voltage voltage divider, MAX641 can according to other direct voltages beyond regulation output+5V.
The output of chip is directly connected with input voltage by the present invention, 7 pin VFB are connected with peripheral two divider resistances simultaneously, so, just the output voltage of adjustable MAX641 chip, two divider resistances are respectively R3 and R4, these two divider resistances directly determine its magnitude of voltage exported, and concrete dividing potential drop is closed and is:
V
o＝1.31(R
3/R
4+1)
Resistance size by changing divider resistance R3 and R4 reaches the object of regulation output voltage.
Claims (1)
1. improve the biasing circuit that the efficiency of electric charge collected by pole plate, it is characterized in that wherein W7805 is integrated series type pressurizer, be the integrated output voltage of three ends be 5V voltage-stabilizing device, have three pins, wherein 1 pin is input, 2 pin are output, 3 pin are Voltage Cortrol end (being called for short adjustment end), W7805 output voltage is 5V, maximum output current is 1.5A, easily causes inductive effect when input line is longer, therefore adopts electric capacity C7 to offset inductive effect, avoid self-oscillation occurs, electric capacity C6 then can suppress the high-frequency noise in output voltage; Wherein adopt the MAX641 chip that MAXIM company of the U.S. produces, it is a kind of step-up DC ~ DC converter, also be the external pressure switching regulator that a kind of CMOS constructs, low in energy consumption, input and output wide ranges, application MAX641 chip not only can provide fixing+5V direct-flow steady voltage for circuit, the direct voltage of output can also be changed by connecting peripheral components, the outstanding advantage of MAX641 chip is that the peripheral components needed for it is few, and chip entirety is small and exquisite, is applicable to make portable instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510466895.2A CN104993695A (en) | 2015-07-31 | 2015-07-31 | Bias circuit capable of improving charge collection efficiency of pole plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510466895.2A CN104993695A (en) | 2015-07-31 | 2015-07-31 | Bias circuit capable of improving charge collection efficiency of pole plate |
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| Publication Number | Publication Date |
|---|---|
| CN104993695A true CN104993695A (en) | 2015-10-21 |
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|---|---|---|---|
| CN201510466895.2A Pending CN104993695A (en) | 2015-07-31 | 2015-07-31 | Bias circuit capable of improving charge collection efficiency of pole plate |
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| CN (1) | CN104993695A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253664A (en) * | 2016-08-12 | 2016-12-21 | 安徽中杰信息科技有限公司 | The biasing means of electric charge efficiency collected by a kind of pole plate that improves |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201750187U (en) * | 2010-08-07 | 2011-02-16 | 青岛理工大学 | Solar-energy charging device |
| CN201758360U (en) * | 2010-07-21 | 2011-03-09 | 上海仁机仪器仪表有限公司 | High-voltage power supply module of radioactivity detector probe |
| CN102322668A (en) * | 2011-09-30 | 2012-01-18 | 芦福贵 | Solar air-conditioner |
| CN202456202U (en) * | 2011-12-19 | 2012-10-03 | 青特集团有限公司 | Laser bird repelling device |
| CN102855851A (en) * | 2011-06-30 | 2013-01-02 | 北京众智同辉科技有限公司 | Polymer dispersed crystal liquid film driving method and direct-current power source driving device |
-
2015
- 2015-07-31 CN CN201510466895.2A patent/CN104993695A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758360U (en) * | 2010-07-21 | 2011-03-09 | 上海仁机仪器仪表有限公司 | High-voltage power supply module of radioactivity detector probe |
| CN201750187U (en) * | 2010-08-07 | 2011-02-16 | 青岛理工大学 | Solar-energy charging device |
| CN102855851A (en) * | 2011-06-30 | 2013-01-02 | 北京众智同辉科技有限公司 | Polymer dispersed crystal liquid film driving method and direct-current power source driving device |
| CN102322668A (en) * | 2011-09-30 | 2012-01-18 | 芦福贵 | Solar air-conditioner |
| CN202456202U (en) * | 2011-12-19 | 2012-10-03 | 青特集团有限公司 | Laser bird repelling device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253664A (en) * | 2016-08-12 | 2016-12-21 | 安徽中杰信息科技有限公司 | The biasing means of electric charge efficiency collected by a kind of pole plate that improves |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151021 |