Fuel cell monolithic voltage monitor of vehicle

Abstract

A device for monitoring single plate voltage of vehicle fuel cell is featured as connecting input end of optical couple gating communication circuit to each single plate of fuel cell in sequence, connecting output end to isolation circuit input end, inputting signal to monolithic computer through absolute value circuit after isolation treatment, controlling four I / O pin signals by said computer and using hardware interlocking circuit to ensure uniqueness of gating channel, carrying out communication with external main controller by monolithic computer through CAN communication circuit.

Description

technical field [0001] The invention belongs to a fuel cell voltage monitoring device, in particular to a vehicle fuel cell monolithic voltage monitoring device. Background technique [0002] Fuel cell monolithic voltage is one of the important indicator parameters of fuel cell performance. By measuring its value, the working state of the fuel cell stack can be monitored to achieve the purpose of protecting the fuel cell. [0003] The operating range of fuel cell single chip voltage is generally less than 1V, and it can be slightly higher than 1V at no-load. As a single-chip voltage monitoring device for vehicle fuel cells, the following technical requirements need to be met: [0004] (1) Fast measurement speed: Due to power requirements, fuel cells for vehicles are generally composed of hundreds or thousands of monoliths. To ensure real-time measurement, the measurement speed of each monolith should be as fast as possible, generally less than 1ms , to complete all single-...

AI Technical Summary

Problems solved by technology

However, these methods all have certain deficiencies. For example, when the resistance voltage division method measures a large number of single chips, the error is too large; the method of applying a linear isolated differential operational amplifier requires that each single cell be equipped with an isolated differential operational amplifier, and the system cost High, bulky, complex wiring

Now the method of photoelectric isolation relay is widely used. It directly measures each single chip through the method of optocoupler gating. It has high precision, but its safety is not perfect, especially the stack measurement reference ground and The isolation problem between the power supply and ground of the measurement circuit needs to be improved. If this problem is not solved properly, it is easy to cause the circuit of the single chip to be burned.

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