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Fuelcell unit voltage measuring method

A voltage measurement, fuel cell technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of not being able to solve the problem of multiple serially connected single cell transmission measurement and common ground, parallel output, unable to detect at the same time, There are problems such as interference in the circuit, so as to save independent power supply or ground monitoring circuit, the circuit is simple, and the linearity is good.

Inactive Publication Date: 2004-01-28
上海新源动力有限公司
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Problems solved by technology

[0002] In the prior art, there are many methods for measuring the voltage of the fuel cell: 1. using a stepper to measure; 2. using a relay to measure; 3. using an isolation amplifier to measure. The obtained measured battery signal is sent to the automatic tester through the analog-to-digital conversion circuit, and the automatic tester performs a tour inspection on the measured value. Transmission measurement, common ground, and parallel output of multiple single cells connected in series; the signal of the measured battery needs to be converted from analog to digital, and there is interference between circuits; the circuit is complex

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Embodiment 1

[0038] Divide 18 series-connected single cells into 3 groups, each group has 6 single cells, and use 3 groups of differential linear isolation amplifiers, each group has 6 differential linear isolation amplifiers, and its input terminals are respectively connected to a The two ends of the 6 single cells connected in series are connected, and at the output of each differential linear isolation amplifier V 0 Measure the output value. See Table 1 for input and output values ​​and their differences.

Embodiment 2

[0040] Divide the 16 series-connected single-cell voltages into 2 groups, each group has 8 single-cells, and use 2 groups of differential linear isolation amplifiers, each group has 8 differential linear isolation amplifiers, and its input terminals are respectively connected with the resistors R1 and R2. A group of 8 cells connected in series are connected at both ends, at the output of each differential linear isolation amplifier V 0 Measure the output value. See Table 2 for input and output values ​​and their differences.

[0041] Group number

[0042] Group number

Embodiment 3

[0044] Divide 30 series-connected cell voltages into 3 groups, the first group has 10 cells, the second group has 8 cells, and the third group has 12 cells. Three groups of differential linear isolation amplifiers are used, and the input terminals pass through Resistors R1 and R2 are respectively connected to three sets of single cells connected in series, and at the output of each differential linear isolation amplifier V 0 Measure the output value. See Table 3 for input and output values ​​and differences.

[0045] Group number

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Abstract

The method for measuring voltage of single cell of fuel-cell is characterized by that several series-connected single-cells are grouped, two ends of every single-cell are connected with differential linear isolation amplifier, every group is independently power-supplied, and they are connected in the non-common earth mode, and their outputs are isolated and parallel common earth mode. The described differential linear isolation amplifier is formed from two-stage amplifier, capacitor C and resistors of R1-R7, its first amplifier is differential amplifier F1, its input end is connected with a group of single cells, second amplifier is linear isolation amplifier formed from negative feedback amplifier F2 and isolator F3, the secondary output end of photoelectric coupler V02 of isolator F3 is connected with independent power supply. Said invention possesses transmission measurement function of several series-connected single-cells, and possesses the advantages of common earth parallel output and anti-interference.

Description

technical field [0001] The invention relates to a voltage measurement technology, in particular to a single-cell voltage measurement method of a fuel cell. Background technique [0002] In the prior art, there are many methods for measuring the voltage of the fuel cell: 1. using a stepper to measure; 2. using a relay to measure; 3. using an isolation amplifier to measure. The obtained measured battery signal is sent to the automatic tester through the analog-to-digital conversion circuit, and the automatic tester performs a tour inspection on the measured value. Transmission measurement, common ground, and parallel output of multiple single cells connected in series; the signal of the battery under test needs to be converted from analog to digital, and there is interference between circuits; the circuit is complex. Contents of the invention [0003] In order to solve the above-mentioned shortcomings, the present invention provides a method for measuring the voltage of a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 刘云波张德禄韩明张恩浚衣宝廉
Owner 上海新源动力有限公司
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