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Safety and precise fuel cell voltage monitoring apparatus

A fuel cell and voltage monitoring technology, applied in measuring devices, measuring current/voltage, measuring electricity, etc., can solve the problems of reducing communication reliability, unable to judge in real time whether the fuel cell electrodes are working normally, burning electrodes, etc. The effect of data communication volume, reduction of data processing volume, and improvement of measurement accuracy

Active Publication Date: 2009-02-25
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The controller cannot judge in real time whether the electrodes of the fuel cell are working normally
[0017] 2. A large amount of data is transmitted on the CAN bus, which reduces the reliability of communication
[0019] 4. Increasing the number of monitoring points cannot fully compensate for the lack of communication speed. At the same time, when a fuel cell electrode fails, it is impossible to determine which electrode is faulty because one monitoring point measures too many electrodes.
However, when the single-chip CPU is disturbed, the signal on the I / O port controlling the photoelectric switch may be reversed, changing from 0 to 1 or from 1 to 0. When the signal is changed from 0 to 1, it will cause The two electrodes whose signal is the same as 1 are short-circuited, so that the single-electrode voltage of this road is also connected to the CPU in series.
A higher voltage is applied to the CPU, which may cause the burning of the CPU in light cases, or cause the electrodes to be burned out in severe cases.

Method used

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  • Safety and precise fuel cell voltage monitoring apparatus
  • Safety and precise fuel cell voltage monitoring apparatus
  • Safety and precise fuel cell voltage monitoring apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The method of the present invention is further described in conjunction with specific component models.

[0048] combine figure 2 , the differential amplifier adopts INA148±200V common-mode voltage differential amplifier, and the CPU adopts LPC2119 single-chip 32-bit ARM chip of PHILIPS Company, which has 4 A / D converters and CAN bus interface, and the multi-channel switch adopts 74HC4051 eight-channel multi-channel Road converter, its working process is as follows:

[0049] 1. Use INA148 to measure the voltage difference V between two electrodes o =(Vin+)—(Vin-)

[0050] 2. Use 8 to 1 multi-way switch to switch between 8 electrodes in turn.

[0051] 3. Put V o Send A / D for conversion.

[0052] 4. Correspond the converted digital quantity with the voltage value.

[0053] 5. Repeat the above steps 1-4 to get the voltage value of 32 electrodes.

[0054] 6. Add the voltage difference between each electrode to get the total voltage by program.

Embodiment 2

[0056] The method of the present invention will be further described in conjunction with the embodiment of measuring the voltage difference between the 4th and 5th electrodes of the fuel cell stack.

[0057] combine figure 2 , when it is necessary to measure the voltage difference between the 4 and 5 electrodes of the fuel cell stack, the working process is as follows:

[0058] 1. The INA148 connected between the two electrodes 4 and 5 gets the analog signal V of the voltage difference between electrode 4 and electrode 5 o =(Vin+)-(Vin-).

[0059] 2. Use the three I / O ports P0.16, P0.17, and P0.18 of LPC2119 to gate the multi-way switch 1, and the gate status table is as follows:

[0060] P0.18 P0.17 P0.16 Gated electrode electrode voltage difference 0 0 0 1, 2 electrode voltage difference 0 0 1 2, 3 electrode voltage difference 0 1 0 3, 4 electrode voltage difference 0 1 1 4, 5 electrode voltage difference 1 0 0 5, 6 ele...

Embodiment 3

[0067] The method of the present invention will be further described in conjunction with the embodiment in which the single-chip computer analyzes the monitoring information of the fuel cell voltage.

[0068] combine Figure 4 , the specific implementation process of the single-chip microcomputer analyzing the monitoring information of the fuel cell voltage is as follows:

[0069] 1. Sampling filter

[0070] The single-chip microcomputer selects the measurement point through chip selection, and samples each monitoring point in the fuel cell stack 301 once every 5 ms, that is, 200 samples per second. For every 20 measured values, remove the maximum value and the minimum value and calculate the average value by weighting to obtain the measured value. In this way, a measured value is obtained every 100ms.

[0071] 2. Data communication

[0072] First add up the above measured values ​​to get the total voltage. Calculate the serial number and voltage value of the monitoring p...

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Abstract

The invention relates to a safe and exact fuel battery voltage detect device, which include single battery voltage detect device, fuel battery controller. The single battery voltage detect device include some difference amplifiers, some multiple-way switch, SCM having CAN bus communication interface. The SCM include an ADC and CPU. The difference amplifiers connect with single battery one by one corresponding, to measure the voltage difference between the two single poles of the fuel battery galvanic pile. The multiple-way switch is on or off by the control of the CPU. The ADC transforms the voltage signals outputted from the difference amplifiers to digital signals. The CPU analyzes the digital signals and gets the monitoring information, then the SCM sends the information out to fuel battery controller.

Description

technical field [0001] The invention relates to fuel cells, in particular to a safe and accurate fuel cell voltage monitoring device. Background technique [0002] An electrochemical fuel cell is a device that converts hydrogen and oxidants into electrical energy and reaction products. The internal core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode (MEA) is composed of a proton exchange membrane and two porous conductive materials, such as carbon paper, sandwiched between the two sides of the membrane. On the two boundary surfaces of the membrane and the carbon paper, there are even and finely dispersed catalysts for initiating electrochemical reactions, such as metal platinum catalysts. Conductive objects can be used on both sides of the membrane electrode to draw the electrons generated during the electrochemical reaction through an external circuit to form a current loop. [0003] At the anode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36G01R19/00
Inventor 王立明付明竹葛栩栩胡里清
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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