Abstract: A method and apparatus are disclosed for preventing damage to an alternator of a genset resulting from high currents within the alternator. The method includes calculating, at a processor, a first quantity related to a current flowing through the alternator during a first time period, and comparing, at the processor, the first quantity with a first threshold. The method further includes calculating, at the processor, a second quantity related to the current flowing through the alternator during at least one of the first time period and a second time period, and comparing, at the processor, the second quantity with a second threshold. The method additionally includes indicating a current overload condition if at least one of the first quantity exceeds the first threshold or the second quantity exceeds the second threshold.

Abstract: An apparatus for use with a switch-mode rectifier for minimizing DC bus voltage without causing current distortion, the apparatus monitoring rectifier saturation and decreasing DC bus voltage until the rectifier is near a saturation point and then maintaining the DC bus voltage at that point.

Abstract: A method and/or apparatus for altering command voltages when a modulation index is greater than unity in order to maintain the linear relationship between the fundamental component of phase voltage and a sinusoidal command voltage in PWM inverter or converter usage. The method and/or apparatus calculates a command signal magnitude above which a command signal should be clamped to a peak carrier value in order to add volt-sec to an output phase voltage that are lost when the amplitude of the command signal exceeds that of a carrier signal. A modified command signal is provided which maintains said linear relationship.

Abstract: A method and/or apparatus for altering command voltages when a modulation index is greater than unity in order to maintain the linear relationship between the fundamental component of phase voltage and the command voltage in PWM inverter or converter usage. The method and/or apparatus calculates and provides an in phase waveform to be added to the command voltage prior to comparison of the command voltage to a carrier signal, the sum of the waveform and command voltage producing a modified command voltage which maintains said linear relationship.

Abstract: A method and/or apparatus for converting voltage using a pulse width modulator and an inverter/converter, the inverter/converter including three legs and a triangle signal generator providing a triangle signal having a peak magnitude. A plurality of sinusoidal reference signals are provided which are displaced from one another by a phase angle. The absolute values of the maximum and minimum values of the reference signals are detected, if the absolute value of the maximum signal is greater than or equal to the absolute value of the minimum signal, the maximum signal is subtracted from the peak magnitude to produce a modifier signal. If the absolute value of the maximum signal is less than the absolute value of the minimum signal, the inverted minimum signal is added to the negative of the peak magnitude of the carrier to produce the modifier signal.