Patent ID: 9017889
Filing Date: 2015-04-28
Classification: G01R,H01M,H04Q,Y02E

Abstract:
1. A method for monitoring voltages of fuel cells in a fuel cell group, said method comprising: providing a sequence of voltage signals representative of the voltages of the fuel cells in the group, where the sequence of voltage signals are provided in order of the position of the fuel cells in the group; providing a sequence of synchronization and calibration pulses that define a predetermined voltage; combining the sequence of voltage signals and the sequence of calibration pulses so that the calibration pulses are provided before a voltage signal of a first cell in the group; and modulating the combined sequence of the voltage signals and the calibration pulses to provide a pulse width modulation (PWM) signal where a width of pulses representing the voltage signals in the PWM signal is proportional to a width of pulses representing the calibration pulses in the PWM signal, and where the modulated calibration pulses are four calibration pulses having a pattern of a narrow width high voltage pulse followed by a wide width low voltage pulse followed by a narrow width high voltage pulse followed by a wide width low voltage pulse.