Current Zero Crossing in an Inverter

摘要

Power electronics unit, which comprises a controller and at least one half bridge with a first switching element and with a second switching element, and has a phase current output between the two switching elements, at which phase current output the first switching element and the second switching element can be switched in the push-pull mode for a switching time at a cycle frequency, and at which the controller sets the switching time and/or the cycle frequency as a control variable, in order to provide, at the phase current output, a specified amplitude, frequency and phase position of the phase current in a switching cycle, so that the amplitude, the frequency and the phase position at the phase current output can be predicted at the phase current output for the switching cycle, the polarity of the phase current is used as an observation variable, and the determined switching time for the switching cycle is a function of the direction of the predicted phase current.

主权项

1. A power electronics unit comprising a controller and at least one half bridge with a first switching element and with a second switching element, and having a phase current output between the two switching elements, at which phase current output the first switching element and the second switching element can be switched in the push-pull mode for a switching time at a cycle frequency, and at which the controller sets the switching time and/or the cycle frequency as a control variable in order to provide, at the phase current output, a specified amplitude, frequency and phase position of the phase current within an imminent switching cycle, wherein
the amplitude, the frequency and the phase position of the phase current at the phase current output can be predicted, the direction of the predicted phase current is used as an observation variable of the controller, and the controller determines the switching time for the imminent switching cycle as a function of the direction of the predicted phase current.