| 摘要 |
An electrical power inverter having an output voltage waveform that closely corresponds to a reference waveform under a wide range of load conditions is disclosed. The present invention allows for excess energy present at the output port of the electrical power inverter to be coupled back to the input port to maintain the correspondence of the output voltage waveform with the reference waveform when the inverter is providing power to inductive or light resistive loads. The electrical power inverter comprises an input port for receiving a unipolar input voltage and an output port for providing electrical energy to a load, a circuit for generating a reference waveform, a power converter for generating an output voltage at the output port having a waveform that approximately corresponds to the reference waveform, an energy return circuit for selectively coupling energy from the output port to the input port, and a controller for enabling said energy return circuit to selectively couple excess energy from the output port such that the output voltage waveform more closely corresponds to the reference waveform under a wide range of load conditions.
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