Abstract: An apparatus for an alpha trim adjustment includes a phase delay circuit that creates a phase delay for a gate signal for a switching cycle. The gate signal is for a phase of a three-phase, phase shifted alternating current (“AC”) input of a multi-pulse motor drive powering a direct current (“DC”) motor. The apparatus includes an alpha trim circuit that modifies the phase delay with an alpha trim adjustment to create an adjusted phase delay for the switching cycle, a delay application circuit that applies the adjusted phase delay to the gate signal.

Abstract: An apparatus for an alpha trim adjustment includes a phase delay circuit that creates a phase delay for a gate signal for a switching cycle. The gate signal is for a phase of a three-phase, phase shifted alternating current (“AC”) input of a multi-pulse motor drive powering a direct current (“DC”) motor. The apparatus includes an alpha trim circuit that modifies the phase delay with an alpha trim adjustment to create an adjusted phase delay for the switching cycle, a delay application circuit that applies the adjusted phase delay to the gate signal.

Abstract: Systems and methods detect when a transition from a first power module to a second power module is taking place and generates a lockout pulse when the transition is detected. The lockout pulse initiates the blocking of a predetermined number of gate pulses from reaching the second power module. When the predetermined number of gate pulses are blocked, the systems and methods reset to allow complete gate pulses to reach the second module, and continues to detect when the next transition takes place.

Abstract: A gate firing phase shift delay line technique is described for use in DC motor drive systems and is easily adaptable for controlling a plurality of electronically coupled power modules. A drive regulator is configured to produce a master gate firing timing signal for controlling the gate firing pattern of switching devices for a first power module. One or more delay blocks are configured to generate slave gate firing timing signals that are phase locked and identical but delayed in time with respect to the master signal. Each additional delay block is coupled to an additional power module having a set of switching devices controllable by the slave signals. The current output of each power module is summed via summing circuitry to deliver an output suitable to drive motors or other electrical loads in high power applications. The power modules can also be connected in series to combine (sum) the voltages for delivery to an electrical load.

Abstract: Systems and methods detect when a transition from a first power module to a second power module is taking place and generates a lockout pulse when the transition is detected. The lockout pulse initiates the blocking of a predetermined number of gate pulses from reaching the second power module. When the predetermined number of gate pulses are blocked, the systems and methods reset to allow complete gate pulses to reach the second module, and continues to detect when the next transition takes place.

Abstract: A gate firing phase shift delay line technique is described for use in DC motor drive systems and is easily adaptable for controlling a plurality of electronically coupled power modules. A drive regulator is configured to produce a master gate firing timing signal for controlling the gate firing pattern of switching devices for a first power module. One or more delay blocks are configured to generate slave gate firing timing signals that are phase locked and identical but delayed in time with respect to the master signal. Each additional delay block is coupled to an additional power module having a set of switching devices controllable by the slave signals. The current output of each power module is summed via summing circuitry to deliver an output suitable to drive motors or other electrical loads in high power applications. The power modules can also be connected in series to combine (sum) the voltages for delivery to an electrical load.