[introduction] hydrogen can be wind, light, water but the important changeover hub of second birth the sources of energy, and in include make, store, the carry, hydrogen that uses many segment can in industrial catenary, hydrogenous fuel cell serves as hydrogen can the crucial technology of translate into electric energy, have very important place. In all sorts of fuel cell, cell of fuel of proton exchange film has power density tall, without electrolyte leak risk, can fall to be opened quickly at room temperature stop wait for an advantage, in traffic, portable generate electricity, in miniature stationary generates electricity wait for applied setting to have wide applied perspective.

Its drive means returns the electric motor-car of hydrogenous fuel cell is electric machinery, hydrogen just uses the sources of energy that reaction generates electricity, with oxygen reaction produces electric energy finally, drive car travel. The voltage of fuel cell monomer is less than 1V, output voltage to rise, need to comprise series of pile of monomer of many fuel cell caboodle of fuel cell report commonly. To assure fuel cell move normally, still need the caboodle that it is report to match accessory system, in order to last to fuel cell supply the reactant of proper temperature, pressure, discharge, humidity, eduction gives birth to become water and quantity of heat.

Electric caboodle and accessory system form fuel cell system jointly, the health of fuel cell basically is mirrorred on its monomer voltage, too too dry, wet, be short of the element such as the undesirable operation condition such as gas and damage to all can make the monomer voltage of fuel cell produces a change. Accordingly, if want to diagnose the condition of fuel cell or support monomer voltage,undertake fuel cell system is controlled, know the monomer voltage of fuel cell with respect to need, cooperate to use fuel cell (report piles) with check of make one’s rounds.

Check of voltage make one’s rounds collects the monomer batteries on line and caboodle of fuel cell report to have link through signal of check of make one’s rounds, in order to realize the collection of voltage, news report of check of make one’s rounds is carried in check of voltage make one’s rounds (like communication of CAN bus line) wiring harness transmits communication tool, news report is carried after tool and go up a machine join, the report that direct monitoring or record collect piles monomer voltage.        

Well-known, lithium battery bag is charging batteries of the need when discharge runs a system (BMS) , basically be to detect the parameter of temperature of voltage electric current of lithium battery; Assure lithium battery can safety is used; Same fuel cell also needs to undertake detecting to its condition when the job, ensure the function is safe. Fuel cell is different from the discharge principle of lithium battery as a result of its, when its detect, basically detect the voltage of batteries, the parameter such as temperature namely fuel cell report piles check of make one’s rounds (CVM) .

Because fuel cell is doing proton,proton can appear to exchange velar polarity to invert now and then when exchange generates electricity, so plan of traditional lithium battery BMS no longer applicable undertake detecting to fuel cell. Pile issue of check of make one’s rounds to solve fuel cell report, domestic share company uses imitate depart plan to solve this one problem.

Characteristic of imitate depart plan

Use multichannel voltage carry puts Gao Gongmo and 12Bit ADC collects batteries voltage, batteries and collect board segregation uses high-pressured smooth Ou to do segregation; Batteries passageway switch uses encoder. Collect board and advocate accuse MCU to do segregation, collect board use segregation CAN communication with car main engine.

Link of this plan signal is as follows:

This plan characteristic:

●  Carry puts 8 Gao Gongmo, smooth Ou of multichannel high pressure can measure cell of fuel of 120 series connection

●  The passageway measures range: ± 4V

●  Keep apart power supply of 5V only power source

●  2 CAN

●  Always measure an error to be 15mV

●  Communication cycle 100ms

●  Working temperature: – 40-85 ℃

ADI AFE compositive solution

Be aimed at fuel cell market, ADI rolled out the AFE compositive solution with only industry, LTC6806.

LTC6806 is monitor of cell of a fuel, measurable amount to cell of fuel of 144 series connection, always measure an error to be less than 15mV. LTC6806 includes 36 inputs channel, every passageway has ± 5V to measure range, allow every passageway to measure the 1 fuel cell that establishs ties to 4.

   

The characteristic of this plan:

●  36 measure a passageway but monitoring amounts to cell of fuel of 144 series connection

●  The passageway measures range: ± 5V

●  Limits of batteries group voltage: – 80V comes 150V

●  Power supply of 5V only power source

●  But pile framework supports group of large fuel cell

●  Inside buy type IsoSPI? Interface

●  Always measure an error to be 15mV

●  Need 6.75ms to be able to measure all unit in the system only

●  Have inside the Δ of buy noise filter – Σ converter

●  I/O of 6 current figures or imitate are inputted

●  Temperature or other sensor are inputted (but indicator light of drive discharge, breakdown)

●  Working temperature: – 40-125 ℃        

The advantage of this plan:

●  Compositive spent lofty quantity to reduce module of power source of high-pressured smooth Ou, encoder, segregation use, reduce cost while can reduce PCB Layout difficulty, reduce PCB size

●  Filter of the buy inside LTC6806 can reduce the noise interference when the car is started effectively

●  Interface of ISO SPI of the buy inside LT6806, can make chrysanthemum catenary communication; Convenient much chip is much perhaps modular group cascade

●  Whole system is convenient do miniaturization, modular design; Match the team of hydrogenous fuel cell of car plant more easily

To let the assessment with easier user the function of LTC6806, shorten project development cycle, ADI is offerred demonstrate DEMO, convenient client checks test and verify, shorten development cycle.

Summary

Relative to the separate plan at the tradition, LTC6806 can provide more superior performance and more multiple protection; Also raised voltage to measure precision at the same time, reduce the cost of whole system. The AFE technology with compositive height is in convenient modular miniaturization design, supportive much module is transverse cascade and vertical stroke install means to cascade, convenient user random expands a number, installation is agile, apply freely.

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