Constant voltage discharge adjusting device of fuel cell and adjusting method thereof

Abstract

The invention relates to a constant voltage discharge adjusting device of a fuel cell and an adjusting method thereof, and the constant voltage discharge adjusting device comprises a controller, an analog-digital conversion circuit, a digital-analog conversion circuit, a voltage sampling circuit, a voltage comparing circuit and a current regulating circuit, wherein the analog-digital conversion circuit is connected into analog quantity sampled voltage output by the voltage sampling circuit; the controller is connected into digital quantity sampled voltage output by the analog-digital conversion circuit; the digital-analog conversion circuit is connected into adjusted voltage output by the controller; the voltage comparing circuit is connected into analog quantity voltage output by the voltage sampling circuit and analog quantity adjusted voltage output by the digital-analog conversion circuit respectively, and control voltage is output after comparison and then connected into the current regulating circuit; and the current regulating circuit is connected with the fuel cell in series for forming a discharge loop. By adopting the adjusting device and the adjusting method, the fuel cell can be quickly and accurately controlled to set voltage for performing constant voltage discharge, thereby well overcoming the shortcoming of long constant voltage discharge adjustment time of thefuel cell.

Description

technical field [0001] The invention relates to a fuel cell discharge adjustment technology, in particular to a fuel cell constant voltage discharge adjustment device and an adjustment method thereof. Background technique [0002] In the process of preparing the fuel cell, it is necessary to obtain the polarization curve of the fuel cell through electronic loading, so as to evaluate the discharge performance of the fuel cell. Usually the electronic load provides constant current discharge, constant voltage discharge, constant resistance discharge, constant power discharge and other discharge modes to test the discharge performance of the fuel cell. Before the electronic load can impart a certain constant discharge pattern to the fuel cell, the electronic load must undergo appropriate conditioning steps in order to obtain this constant discharge pattern. [0003] As far as the constant voltage discharge mode is concerned, within the range of 0V to the open circuit voltage of...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned constant voltage adjustment step, the voltage of the fuel cell is gradually adjusted from high to low at a faster speed, while the speed of the fuel cell's voltage to be gradually increased from low to low; due to the asymmetry of the fuel cell voltage adjustment , if a symmetrical adjustment method is used for constant voltage adjustment, that is, when the voltage of the fuel cell is higher than the set voltage, gradually increase the current of the fuel cell discharge circuit to gradually reduce the voltage of the fuel cell, and when the voltage of the fuel cell is lower than the set voltage Voltage, gradually reduce the current of the fuel cell discharge circuit to gradually increase the fuel cell voltage, then the constant voltage adjustment time will be very long; when the pressure difference between the set voltage and the fuel cell open circuit voltage is small, the constant voltage adjustment time will be short will be longer

Images