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Voltage itinerant measurement circuit of low-power methanol fuel cell

A methanol fuel cell and measurement circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve problems such as difficult to detect, stack collapse, uneven gas pressure, etc., and achieve the effect of avoiding collapse

Inactive Publication Date: 2010-10-20
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

When the number of battery cells is relatively large, the internal gas pipeline of the battery is relatively long and the pressure drop is relatively large. The unevenness of the multi-cell battery due to processing can also lead to extremely uneven gas pressure entering the battery cavity, which will cause each unit Section voltage is not uniform
The obvious single-cell voltage drop is often very individual, and this change is difficult to detect in the total voltage. The death of a single battery will cause the collapse of the entire stack

Method used

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  • Voltage itinerant measurement circuit of low-power methanol fuel cell
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  • Voltage itinerant measurement circuit of low-power methanol fuel cell

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Embodiment Construction

[0020] The single-cell battery voltage sampling circuit of the present invention is shown in figure 2 , this circuit includes two analog multi-way switches AD7506, a small signal operational amplifier AD620 and 16 current limiting resistors, the analog multi-way switches and operational amplifiers are powered by an isolated power supply with ±15V output, this circuit can measure 15 single-cell voltages . The 4 address input lines are input to the address selection line of the analog switch (A0, A1, A2, A3 port of AD7506) through the optocoupler, and the enabling terminal of the analog switch (EN port of AD7506) is directly connected to the power supply VDD, and the analog switch has 16 channels (S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16 of AD7506) CMOS analog switch. An analog signal sampling circuit with 16 differential inputs composed of two analog switches, one of which is a reference circuit composed of a reference power supply is connecte...

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Abstract

The invention discloses a voltage itinerant measurement circuit of a low-power methanol fuel cell. Generally, a fuel cell stack consists of a plurality of single cells; and because each single cell of the fuel cell stack needs real-time accurate measurement, high-speed itinerant sampling for each single cell is finished by adopting cooperation of an analog multi-way switch and a small signal operational amplifier. Isolation measurement finished by adopting an isolation amplifier is isolation control of the analog multi-way switch finished by a controller through a photoelectric coupler. The voltage itinerant measurement circuit avoids the problems of breakdown of the whole stack caused by the death of the single cell and the like in time by itinerantly monitoring the working voltage of each single cell of the fuel cell stack and designing fault alarm, and is compact and practical.

Description

technical field [0001] The invention relates to a circuit for voltage measurement of a new energy fuel cell, in particular to a voltage circuit measurement circuit for a methanol fuel cell stack. Background technique [0002] With the large consumption of energy in the development of modern society, traditional energy is increasingly unable to meet the requirements of human beings. Especially today when sustainable development and environmental protection are proposed, the development and utilization of new energy has become an extremely important topic for human beings. Among them, the fuel cell is one of the new energy sources being developed and utilized at present. Its mechanism is to use the fuel to chemically react with the oxygen in the air to generate water and carbon dioxide while generating electricity. Energy with high energy utilization efficiency and no pollution to the environment has broad application prospects in fuel cell power stations, electric vehicles, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R31/36
Inventor 曾洁郭永伟贾世杰邹娟
Owner DALIAN JIAOTONG UNIVERSITY
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