Power-level waveform generation method

摘要

The present invention relates to a method of generating various alternating current waveforms, at power level. The AC mains power supply is rectified, processed by various circuits, controlled by a control unit and inverted as required at the output. This method may be employed with converter isolation from the mains. It is also possible to employ the system so that the input current is sinusoidal and the power factor of the converter is unity. The present invention produces preferably the sinusoidal output waveform with fundamental component at the desired frequency, where this waveform is produced employing a DC bus from which output voltage with the fundamental component at the desired shape and frequency is obtained using pulse width modulation techniques. The output stage is simply an inverter which inverts this waveform at zero-crossings of the rectified waveform to obtain an AC output.

主权项

1. A waveform generation method for generating a desired waveform, with isolation and with sinusoidal input current, comprising the steps:
rectifying AC input and as a result of this step generating a rectified waveform; sending the rectified waveform to a step up DC to DC converter through a DC bus, wherein the step up DC to DC converter is capable of providing accommodation of sinusoidal input; processing the rectified waveform via the step up DC to DC converter; sending the processed waveform output from the step up DC to DC converter to a step down DC to DC converter with isolation through a regulated DC bus, wherein the step down DC to DC converter with isolation is capable of providing isolation of the mains and the output; processing the processed waveform output from the step up DC to DC converter via the step down DC to DC converter with isolation; sending the processed waveform output from the step down DC to DC converter with isolation to a synchronous buck converter through an intermediate regulated DC bus, wherein the synchronous buck converter is capable of providing full wave rectified sinusoidal waveform or any desired waveform; processing the processed waveform output from the step down DC to DC converter with isolation via the synchronous buck converter; sending the processed waveform output from the synchronous buck converter to an inverter; and inverting the processed waveform at zero-crossings via the inverter.