CN101335352A - Electronic load of fuel cell and manufacturing method - Google Patents
Electronic load of fuel cell and manufacturing method Download PDFInfo
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- CN101335352A CN101335352A CNA2007100119114A CN200710011911A CN101335352A CN 101335352 A CN101335352 A CN 101335352A CN A2007100119114 A CNA2007100119114 A CN A2007100119114A CN 200710011911 A CN200710011911 A CN 200710011911A CN 101335352 A CN101335352 A CN 101335352A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to an electronic load preparation method of a fuel cell. The method adopts low on-resistance property of a power MOSFET as the electronic load of the fuel cell. The on-resistance can be randomly adjusted by controlling the voltage between grid source electrodes of the electronic load, thereby changing the load. The parallel connection of a plurality of power MOSFETs can realize low-voltage heavy-current discharge of the fuel cell. The electronic load obtained from the method can fully meet the technological requirement for the evaluation of the fuel cell, has the advantages of low on-resistance, heavy current discharge, high control precision, and high resistance to interference etc., and particularly has very low manufacturing cost.
Description
Technical field
The present invention relates to fuel cell technology, particularly a kind of manufacture method of electronic load of fuel cell.
Background technology
Fuel cell is the battery pack of forming with a plurality of monolithic batteries.When developing novel battery, in order to reduce development cost, way is earlier monolithic battery to be studied usually, produces the less monolithic battery of area, carries out performance evaluation then, and performance is amplified after reaching requirement more in proportion, makes applicable battery pack.
The performance evaluation of battery be unable to do without load.Stable performance, adjustability are good, adaptability is by force the key index of cell load.The characteristics of monolithic fuel cell are, low-voltage and high-current, and voltage is 1V when unloaded, voltage dropped to below the 0.2V when discharging current was maximum.If the area that monolithic battery is done is smaller, maximum discharge current is less than 10A, and load resistance can satisfy the discharge requirement less than 0.02 Ω, and therefore, selecting resolution for use is 0.01 Ω.The standard DC resistance box can do the load of estimating battery.
But the sample battery performance that area is less and the battery of practical application also have gap, in order to guarantee that evaluation result to the monolithic battery newly developed more near the battery performance of practical application, must add the area of macrocell.Like this, and though below the voltage 0.2V when the monolithic battery discharging current after area amplifies is maximum discharging current can reach more than the 60A, the load resistance of discharge must be less than 0.003 Ω.With slide wire resistor or standard DC resistance box obviously dying, because the contact resistance of sliding end is just much larger than this value.Must find the especially little load of resistance, this is a big problem in fuel cell technology field, in the electronic load patent of invention, seldom has to satisfy to be fit to the electronic load that fuel cell is used at home.
Document (1) (application number: 02124911.3, publication number CN1464578A) mentions the electronic load of the low on-resistance characteristic of employing power field effect pipe MOSFET as fuel cell, can adjust the size of conducting resistance arbitrarily by controlling its grid voltage between source electrodes, promptly change the size of load.This method is in order to improve the anti-interference of power field effect pipe (MOSFET), 0-4V control signal with intelligent controller output, by accurate isolated amplifier, receive the grid-control voltage of power field effect pipe MOSFET again, to improve the accuracy and the anti-interference of control signal.
The applicant finds that electronic component power field effect pipe (MOSFET) has following characteristics:
Drain current I
D, the current capacity of sign power field effect pipe MOSFET, its test condition is U
GSFor=10V, U
DSDrain current during for certain appropriate value.Electric current I in the practical application
dShould be less than 60%I
DMove reliable.
Drain-source breakdown voltage U
(BR) DS, the withstand voltage limit of sign power MOSFET.U
GS=0 o'clock, the drain-source voltage the when reverse leakage current between the drain-source reaches a certain setting.
Grid source puncture voltage U
(BR) GS, characterizing the ceiling voltage that can bear between power MOSFET grid source, its value is generally scholar 20V.
Cut-in voltage U
GS (th), the minimum gate source voltage when it refers to and levies power MOSFET and flow through a certain amount of drain current.When gate source voltage equaled cut-in voltage, power field effect pipe MOSFET began conducting.The cut-in voltage that shows among Fig. 1 is less than 2V.Power MOSFET belongs to the voltage-type control device, as long as the voltage that applies between grid and the source electrode will conducting above its threshold voltage.Because there is junction capacitance in MOSFET, the unexpected rising of its drain-source both end voltage will produce interference voltage by junction capacitance during shutoff at two ends, grid source, so anti-interference is relatively poor.
In order to improve the anti-interference of power field effect pipe (MOSFET), 0-4V control signal with intelligent controller output, by accurate isolated amplifier U1, receive the grid-control voltage of power field effect pipe MOSFET again, to improve the accuracy and the anti-interference of control signal.
Conducting resistance R
ON, be meant at definite gate source voltage U
GS, the D.C. resistance when power MOSFET is in the constant current district, it and output characteristic are closely related, are the important parameters of power output of having the greatest impact.
If make electronic load, can satisfy fuel cell to the such requirement of the small resistance of low-voltage and high-current with one group of MOSFET.
Summary of the invention
The manufacture method that the purpose of this invention is to provide a kind of electronic load of fuel cell, to realize the low-voltage and high-current discharge of fuel cell, it is low to have conducting resistance, and discharging current is big, control precision height, characteristics such as strong interference immunity.
For achieving the above object, solution of the present invention is to adopt the electronic load of power field effect pipe (MOSFET) low on-resistance characteristic as fuel cell, can adjust the size of conducting resistance arbitrarily by controlling its grid voltage between source electrodes, promptly change the size of load.
A kind of electronic load of fuel cell adopts the electronic load of the low on-resistance characteristic of power field effect pipe MOSFET as fuel cell; Its core parts are exactly MOSFET, in order to improve the anti-interference of power field effect pipe (MOSFET), 0-4V control signal with intelligent controller output, by accurate isolated amplifier U1, receive the grid-control voltage of power field effect pipe MOSFET again, to improve the accuracy and the anti-interference of control signal.
A kind of manufacture method of electronic load of fuel cell can be adjusted the size of conducting resistance arbitrarily by controlling its grid voltage between source electrodes, promptly changes the size of load:
The first step is at first determined power parameter, determines the voltage and current value, calculates load resistance and should reach how many ohmages, just can reach the discharge requirement;
In second step, select power field effect pipe MOSFET according to calculating gained load resistance resistance;
In the 3rd step, the design circuit plate will be no less than two power field effect pipe MOSFET parallel connection, and the minimum resistance after the calculating parallel connection judges whether to meet the electronic load requirement;
In the 4th step, Circuit Design designs an intelligent controller; The rarest two road A/D conversion of controller, one road D/A conversion; Be respectively applied for measuring voltage, electric current, output 0-4V voltage by accurate isolated amplifier, is received the grid-control voltage of power field effect pipe MOSFET again, is used for the control gate pole tension, changes the conducting resistance of power field effect pipe MOSFET;
In the 5th step, the software programming of intelligent controller can be set the watt level of load and the Changing Pattern of real-time detection electric current in software.
The 6th step, machine debugging.
Described a kind of electronic load of fuel cell manufacture method, the overcurrent in order to prevent device fault, overcurrent protection resistance of string in each loop.In order to improve the anti-interference of power field effect pipe (MOSFET), 0-4V control signal with intelligent controller output, by accurate isolated amplifier, receive the grid-control voltage of power field effect pipe MOSFET again, to improve the accuracy and the anti-interference of control signal.
The electronic load that utilizes this method to make can satisfy the specification requirement that fuel cell is estimated fully, and it is low to have conducting resistance, and discharging current is big, control precision height, characteristics such as strong interference immunity, the needs of very suitable fuel cell heavy-current discharge.And cost of manufacture is low especially.
Description of drawings
Fig. 1 is power field effect pipe MOSFET gate source voltage U
GSWith drain current I
DIts relation curve;
Fig. 2 is the schematic diagram of electronic load of fuel cell example.
Embodiment
Example 1.200W electronic load making step.
At first determine power parameter, voltage 0-3V, electric current 0-80A.Load resistance should reach 0.0375 Ω, just can reach the discharge requirement;
Second step, select the technical parameter of power field effect pipe MOSFET 2SK2690 to be according to load resistance, conducting resistance is 0.01 Ω, and maximum power is 125W, and maximum current is 80A.
In the 3rd step, the design circuit plate is with 10 2SK2690 parallel connections, as Fig. 2.Calculating can get, and the minimum resistance after the parallel connection is to reach 0.001 Ω.The overcurrent in order to prevent device fault, overcurrent protection resistance R S 1～RS 10 of string in each loop.
The 4th step, Circuit Design.With intelligent controller of 51 series monolithics design.Controller is the rarest two tunnel 12 A/D conversions, one tunnel 8 D/A.Be respectively applied for measuring voltage, electric current, output 0-4V voltage by accurate isolated amplifier U1, is received the grid-control voltage of power field effect pipe MOSFET again, is used for the control gate pole tension, changes the conducting resistance of power field effect pipe MOSFET.
The 5th step, the software programming of intelligent controller.
In the 6th step, machine debugging can be set the watt level and the Changing Pattern of load in software.
According to above-mentioned six steps, a 200W electronic load will be finished.
Actual battery is estimated result of use and is reached requirement fully.
Fig. 1 is gate source voltage U
GSWith drain current I
DIts relation curve.As can be seen, change U
GSSize, pass through electric current I between can power controlling field effect transistor MOSFET drain-source
D, and controllability is very good, is well suited for doing load.
Fig. 2 is the schematic diagram of successful electronic load of fuel cell example.This system is composed in parallel by 10 power field effect pipe MOSFET, and each power MOSFET allows operating current I
D=80A, the maximum drain-source voltage U that allows
DS=60V, maximum power dissipation P
D=125W, on state resistance R
ON=0.01 Ω.Theoretical all-in resistance after the parallel connection can reach 0.001 Ω, but owing to connect the influence of conductor resistance, loop resistance still can satisfy the specification requirement of front monolithic fuel cell less than 0.003 Ω greater than theoretical value.RS1-RS10 is a current-limiting resistance, when the power MOSFET failed shorted, can limit electric current; The resistance R 1-R10 of the 10K Ω of grid serial connection of every power field effect pipe MOSFET can reduce influencing each other between each device of back in parallel.With the 0-4V control signal of intelligent controller output, by accurate isolated amplifier U1, receive the grid-control voltage of power field effect pipe MOSFET again, to reach the accuracy of control signal, reduce the interference of other signals.
Intelligent controller is made up of monolithic computer, and A/D and D/A change-over circuit are arranged, and can record the voltage and the discharge total current of battery, and calculate power.Based Intelligent Control is exported the voltage of 0-4V according to predefined program, promptly regulates the grid-control voltage of power MOSFET, just changes the power and the characteristic of electronic load.Control mode that it had such as constant-current discharge control, constant voltage discharge control, control discharge time etc. are realized by computer software entirely.
Device technique index measured result: the grid voltage U of setting power field effect transistor MOSFET
GS, when the electric current I of individual devices
DDuring=10A, drain-source voltage U
DS=0.17V satisfies the specification requirement that monolithic battery is estimated fully.
Though foregoing just at monolithic battery evaluation load, actual this device is the battery pack that is common to below 10.
When making the electronic load of large-sized battery pack, as long as select conducting resistance R for use according to voltage
ONHigh power field effect pipe MOSFET device is determined the quantity of needs device in parallel according to electric current.Add some protective circuits and software protection, interlock in addition again.
Claims (4)
1. an electronic load of fuel cell is characterized in that, adopts the electronic load of the low on-resistance characteristic of power field effect pipe MOSFET as fuel cell; With the 0-4V control signal of intelligent controller output, by accurate isolated amplifier U1, receive the grid-control voltage of power field effect pipe MOSFET again, can adjust the size of conducting resistance arbitrarily by controlling its grid voltage between source electrodes, promptly change the size of load.
2. the manufacture method of an electronic load of fuel cell is characterized in that, can adjust the size of conducting resistance arbitrarily by controlling its grid voltage between source electrodes, promptly changes the size of load:
The first step is at first determined power parameter, determines the voltage and current value, calculates load resistance and should reach how many ohmages, just can reach the discharge requirement;
In second step, select power field effect pipe MOSFET according to calculating gained load resistance resistance;
In the 3rd step, the design circuit plate will be no less than two power field effect pipe MOSFET parallel connection, and the minimum resistance after the calculating parallel connection judges whether to meet the electronic load requirement;
In the 4th step, Circuit Design designs an intelligent controller; The rarest two road A/D conversion of controller, one road D/A conversion; Be respectively applied for measuring voltage, electric current, output 0--4V voltage by accurate isolated amplifier, is received the grid-control voltage of power field effect pipe MOSFET again, is used for the control gate pole tension, changes the conducting resistance of power field effect pipe MOSFET;
In the 5th step, the software programming of intelligent controller can be set the watt level of load and the Changing Pattern of real-time detection electric current in software;
The 6th step, machine debugging.
3. electronic load of fuel cell manufacture method as claimed in claim 2 is characterized in that, the overcurrent in order to prevent device fault, overcurrent protection resistance of string in each loop.
4. electronic load of fuel cell manufacture method as claimed in claim 2, it is characterized in that, in order to improve the anti-interference of power field effect pipe (MOSFET), 0-4V control signal with intelligent controller output, by accurate isolated amplifier, receive the grid-control voltage of power field effect pipe MOSFET again, to improve the accuracy and the anti-interference of control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100119114A CN101335352A (en) | 2007-06-29 | 2007-06-29 | Electronic load of fuel cell and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100119114A CN101335352A (en) | 2007-06-29 | 2007-06-29 | Electronic load of fuel cell and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101335352A true CN101335352A (en) | 2008-12-31 |
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ID=40197758
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100119114A Pending CN101335352A (en) | 2007-06-29 | 2007-06-29 | Electronic load of fuel cell and manufacturing method |
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|---|---|
| CN (1) | CN101335352A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108172873A (en) * | 2016-12-07 | 2018-06-15 | 中国科学院大连化学物理研究所 | A kind of fuel cell pressure limiting method based on constant voltage mode DC Electronic Loads |
| CN116046849A (en) * | 2023-01-28 | 2023-05-02 | 华北电力大学 | Electrolytic cell impedance spectrum test system for producing hydrogen by electrolyzing water and application thereof |
-
2007
- 2007-06-29 CN CNA2007100119114A patent/CN101335352A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108172873A (en) * | 2016-12-07 | 2018-06-15 | 中国科学院大连化学物理研究所 | A kind of fuel cell pressure limiting method based on constant voltage mode DC Electronic Loads |
| CN108172873B (en) * | 2016-12-07 | 2020-08-04 | 中国科学院大连化学物理研究所 | Fuel cell voltage limiting method based on constant voltage mode direct current electronic load |
| CN116046849A (en) * | 2023-01-28 | 2023-05-02 | 华北电力大学 | Electrolytic cell impedance spectrum test system for producing hydrogen by electrolyzing water and application thereof |
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Open date: 20081231 |