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US 10,819,260 B2Granted
Frequency and load balance compensated, gate firing phase shift delay line
AssigneeRockwell Automation Technologies, Inc.
InventorsJoseph V. Kreinbrink, James Huang, Joseph S. Klak, Mark S. Ruetty
Life of this patent
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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.
Claims19
An apparatus comprising:
- a phase delay circuit that creates a phase delay for a gate signal for a switching cycle, the gate signal for a switch of 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 multi-pulse motor drive comprising an un-delayed rectifier and one or more phase delayed rectifiers and the gate signal is applied to a switch of the one or more phase delayed rectifiers, wherein the phase delay is based on a fundamental frequency of a power source feeding the multi-pulse motor drive;
- an alpha trim circuit that modifies the phase delay with an alpha trim adjustment to create an adjusted phase delay for the switching cycle, wherein the alpha trim adjustment adds delay to or subtracts delay from the phase delay and wherein the alpha trim adjustment is based on current and/or voltage differences between one or more switches of the un-delayed rectifier and one or more switches of a phase delayed rectifier of the one or more phase delayed rectifiers;
- and
- a delay application circuit that applies the adjusted phase delay to the gate signal.
1 more element
An apparatus comprising:
- a first delay circuit that delays a gate signal by 30 degrees plus a first alpha trim adjustment for a first switching cycle, the gate signal 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;
- a second delay circuit that delays the gate signal by 30 degrees plus a second alpha trim adjustment for another switching cycle, wherein the alpha trim adjustment adds delay to or subtracts delay from the 30 degree gate signal delay;
- a setup switch that changes between a first position that connects the first delay circuit while disconnected from the second delay circuit and a second position that connects the second delay circuit while disconnected from the first delay circuit;
- a setup switch controller that changes the setup switch between the first position and the second position during a non-switching period between switching cycles;
- an average current circuit that measures current from two or more phases feeding a 0-degree rectifier of the multi-pulse motor drive and that measures current from two or more phases feeding a 30-degree rectifier of the multi-pulse motor drive and that averages the currents from the phases of feeding the 0-degree rectifier and averages the currents from the phases feeding the 30-degree rectifier;
- and
- an alpha trim circuit that adjusts the second alpha trim adjustment while the setup switch is in the first position and that sets the first alpha trim adjustment while the setup switch is in the second position in response to an amplitude difference between the average current from the 0-degree rectifier and the average current from the 30-degree rectifier.
4 more elements
A multi-pulse motor controller comprising:
- a 0-degree rectifier comprising a plurality of drive switches each driven by a gate signal, the 0-degree rectifier fed by non-phase-shifted phases of a power source;
- a 30-degree rectifier comprising a plurality of drive switches each driven by a gate signal, the 30-degree rectifier fed by phase-shifted phases of a power source,
- wherein outputs of the 0-degree rectifier and the 30-degree rectifier feed a direct current (“DC”) motor, wherein each drive switch of the 30-degree rectifier comprises:
- a first delay circuit that delays a gate signal by 30 degrees plus a first alpha trim adjustment for a first switching cycle, wherein the first alpha trim adjustment adds delay to or subtracts delay from the 30 degree gate signal delay;
- a second delay circuit that delays the gate signal by 30 degrees plus a second alpha trim adjustment for another switching cycle, wherein the second alpha trim adjustment adds delay to or subtracts delay from the 30 degree gate signal delay;
- and
- a setup switch that changes between a first position that connects the first delay circuit while disconnecting the second delay circuit and a second position that connects the second delay circuit while disconnecting the first delay circuit;
- a setup switch controller that changes the setup switch of a drive switch between the first position and the second position during a non-switching period between switching cycles of the drive switch;
- and
- an alpha trim circuit that, for each drive switch, adjusts the second alpha trim adjustment while the setup switch of the drive switch is in the first position and that sets the first alpha trim adjustment while the setup switch for the drive switch is in the second position.
7 more elements
Dependencies are inferred from the claim text.