PWM inverter controller with waveform memory
AssigneeSimmonds Precision Products, Inc.
InventorsDavid F. Flanagan, Keith E. Iholts, John R. Lindbery
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Abstract
A programmed PWM controller for controlling an inverter is provided which includes memory means for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word including a driveword and a drivetime word, the drivewords being used to operate the inverter; first digital means for selectively retrieving each of the plurality of drive data words from the memory means according to the pulsewidth modulation sequence in response to a next drive data word request signal; and second digital means governed by the drivetime word for generating the next drive data word request signal.
Claims33
A pulsewidth modulation (PWM) controller for operating an inverter, said controller comprising:
- memory means for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word comprising a driveword and a drivetime word, said drivewords being used to operate said inverter;
- first digital means for selectively retrieving each of said plurality of drive data words from said memory means according to said pulsewidth modulation sequence in response to a next drive data word request signal;
- and
- second digital means governed by said drivetime word for generating said next drive data word request signal.
An energy conversion system, comprising a pulsewidth modulation (PWM) controller for operating an inverter said controller comprising:
- memory means for storing a plurality of drive data words representing a pulsewidth modulation sequence, each drive data word comprising a driveword and a drivetime word, said drivewords being used to operate said inverter;
- first digital means for selectively retrieving each of said plurality of drive data words from said memory means according to said pulsewidth modulation sequence in response to a next drive data word request signal;
- and
- second digital means governed by said drivetime word for generating said next drive data word request signal;
- said system further comprising an AC source, rectifier means for rectifying the output of said AC source, and said rectified output serving as a DC voltage input to said inverter.
A synchronization system, comprising:
- a pulsewidth modulation (PWM) controller for operating an inverter for providing power to a load, said controller including
- memory means for storing at least a first plurality and a second plurality of drive dam words, each plurality representing a pulsewidth modulation sequence which effects a different output of said inverter;
- means for retrieving said drive data words from said memory means to said inverter;
- means for sensing a phase characteristic of the power delivered to said load relative to the output of the inverter;
- and
- means governed by said means for sensing for selecting which of said pluralities of drive dam words are accessed by said means for retrieving.
A method for providing pulsewidth modulated (PWM) control to an inverter using a plurality of drive data words stored in memory which represent a PWM sequence, each drive data word comprising a driveword and a drivetime word, said method comprising the steps of:
- selectively retrieving a first of said drive data words from said memory and providing a gating signal to said inverter as a function of said driveword included therein;
- comparing said drivetime included in said first of said drive data words with a cycle reference time;
- and
- based on said comparing step, selectively retrieving a second of said drive data words from said memory and providing a different gating signal to said inverter as a function of said driveword included therein.
A regulator system, comprising:
- a pulsewidth modulation (PWM) controller for operating an inverter to provide power to a lead, said controller including
- memory means for Storing at least a first plurality and a second plurality of drive data words, each plurality representing a pulsewidth modulation sequence which effects a different output of said inverter;
- means for retrieving said drive dam words from said memory means to operate said inverter;
- means for sensing a characteristic of the power delivered to said load;
- means governed by said means for sensing for selecting which of said pluralities of drive data words are accessed by said means for retrieving;
- and
- wherein said inverter comprises at least one switch and each Of said drive data words comprises a driveword representing a desired state of said at least one switch, and a drivetime word representative of a time when a switch in said inverter is to change state.
Dependencies are inferred from the claim text.