Approximated sinusoidal waveform inverter
AssigneeNatus Technology Corp.
InventorsKantcho Mitev, Primo Favaro
Life of this patent
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Abstract
A DC-to-AC inverter includes a switch stage having a switch output, a switch controller coupled to the switch stage, and a filter coupled to the switch output. The switch stage includes switch means coupled to the switch output for switching the switch output between a pair of power supply rails. The switch controller is configured to cyclically linearly vary the duty cycle of the output signal at the switch output. The filter is configured to produce a piece-wise linear approximated sinusoidal output waveform from the output signal.
Claims24
A DC-to-AC inverter comprising:
- a switch stage including a switch output and switch means coupled to the switch output for switching the switch output between a pair of power supply rails;
- a switch controller coupled to the switch stage and being configured to cyclically linearly vary a duty cycle of an output signal at the switch output;
- and
- a filter coupled to the switch output for producing a piece-wise linear approximated sinusoidal output waveform from the output signal.
A DC-to-AC inverter comprising:
- a switch stage including a switch output and switch means coupled to the switch output, the switch means being configured to provide a switched constant-peak-amplitude output signal at the switch output;
- a switch controller coupled to the switch stage and being configured to cyclically linearly vary a duty cycle of the output signal;
- and
- a filter coupled to the switch output and configured to produce a piece-wise linear approximated sinusoidal output waveform from the output signal.
A method for converting DC power into AC power, comprising the steps of:
- with switch means generating with a pulse-width modulated output signal, the output signal having a cyclically linearly varying duty cycle and an amplitude varying between a pair of signal levels;
- and
- filtering the output signal in a manner to produce a piece-wise linear approximated sinusoidal output waveform.
Dependencies are inferred from the claim text.