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US 2013/0328515 A1Published application
Motor drive add-on pre-charge capacitive module and method
AssigneeRockwell Automation Technologies, Inc.
InventorJeremiah John Kopiness
Life of this patent
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Abstract
A method for pre-charging a motor drive system includes: pre-charging a motor drive through a motor DC bus where desired, pre-charging an add-on capacitive module through a resistor after a time delay, pre-charging the add-on capacitive module and bypassing the resistor, and disconnecting the add-on capacitive module from the motor DC bus when a fault condition has been detected.
Claims20
An add-on motor drive capacitive module comprising:
- a module DC bus configured to be coupled to a motor DC bus of one or more motor drives;
- a capacitive circuit across first and second legs of the DC bus and configured to store energy when pre-charged;
- a first switch coupled in the first leg of the DC bus;
- an input voltage sensing circuit;
- a module voltage sensing circuit;
- a pre-charge resistor in the first leg of the DC bus;
- a second switch in parallel with the pre-charge resistor and in series with the first switch;
- and
- control circuitry coupled to the voltage sensing circuits and to the first and second switches, and configured to close the first switch based upon a charge state of the one or more motor drives, and to close the second switch based upon a charge state of the capacitive circuit.
6 more elements
A motor drive system comprising:
- a motor drive comprising a rectifier circuit, an inverter circuit, and a motor DC bus coupled between the rectifier circuit and the inverter circuit, a motor drive capacitive circuit coupled across the motor DC bus, and a motor drive pre-charge circuit to the motor drive capacitive circuit and configured to control charging of the motor drive capacitive circuit;
- and
- an add-on capacitive module comprising a module DC bus configured to be coupled to the motor DC bus, a capacitive circuit across of the module DC bus and configured to store energy when pre-charged, an input voltage sensing circuit, a module voltage sensing circuit, a pre-charge resistor coupled to a first leg of the DC bus, a first switch in the first leg of the DC bus, a second switch in parallel with the pre-charge resistor and in series with the first switch, and control circuitry coupled to the voltage sensing circuits and to the first and second switches, and configured to close the first switch based upon a charge state of the motor drive, and to close the first switch based upon a change state of the capacitive circuit.
A method for pre-charging a motor drive system, comprising:
- pre-charging a motor drive through a motor DC bus;
- pre-charging an add-on capacitive module through a resistor after a time delay;
- pre-charging the add-on capacitive module and bypassing the resistor;
- detecting a fault condition;
- and
- disconnecting the add-on capacitive module from the motor DC bus when the fault condition has been detected.
3 more elements
Dependencies are inferred from the claim text.