A.C. to A.C. power converter for the adaptive correction of waveform abnormalities
First Claim
1. A device for controlling energy being delivered to an AC output from an AC supply, comprising:
- a plurality of input sensors connectable to the AC supply for monitoring frequency and voltage of the AC supply and generating input signals proportional thereto;
a power amplifier module connectable to the AC supply, said power amplifier module having means for converting an AC supply to DC and having a pulse width modulator for convening the DC to an AC output,a plurality of output sensors connected the AC output for monitoring frequency and current of the AC output and generating output signals proportional thereto, said AC output connectable to an AC load; and
a control module in communication with the plurality of input sensors and the plurality of output sensors for receiving said input signals and said output signals and with the power amplifier module, said control module having a look up table having stored therein a plurality of pulse width modulation sequences for triggering said pulse width modulator to generate an AC waveform, said control module having an electronic memory comprising an active section and a standby section, the control module selects from said look up table a pulse width modulation sequence for initially triggering said pulse width modulator to convert the DC to the AC output and stores said pulse width modulation sequence in said active section of the memory to trigger said pulse width modulator, said control module continuously receives and compares the input signals and the output signals to responsively select another pulse width modulation sequence from the look-up table and store said another pulse width sequence in said standby section, said control module switches between the standby section and the active section at a next zero crossing of the AC supply to maintain a current being drawn by the AC load substantially in phase relative to the voltage of the AC supply.
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Accused Products
Abstract
A device for controlling an AC output with an AC load from an AC supply comprises a power amplifier module connected to the AC supply and a control module in communication with the AC supply and the power amplifier module. The power amplifier module converts an AC supply to DC and then converts the DC to an AC output. The control module extracts predetermined characteristics, such as current, voltage and frequency from the AC supply and compares the predetermined characteristics with stored load characteristics of the AC load. The control module responsively triggers the power amplifier module to generate an output waveform of the AC output substantially in phase with respect to the AC supply.
61 Citations
15 Claims
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1. A device for controlling energy being delivered to an AC output from an AC supply, comprising:
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a plurality of input sensors connectable to the AC supply for monitoring frequency and voltage of the AC supply and generating input signals proportional thereto; a power amplifier module connectable to the AC supply, said power amplifier module having means for converting an AC supply to DC and having a pulse width modulator for convening the DC to an AC output, a plurality of output sensors connected the AC output for monitoring frequency and current of the AC output and generating output signals proportional thereto, said AC output connectable to an AC load; and a control module in communication with the plurality of input sensors and the plurality of output sensors for receiving said input signals and said output signals and with the power amplifier module, said control module having a look up table having stored therein a plurality of pulse width modulation sequences for triggering said pulse width modulator to generate an AC waveform, said control module having an electronic memory comprising an active section and a standby section, the control module selects from said look up table a pulse width modulation sequence for initially triggering said pulse width modulator to convert the DC to the AC output and stores said pulse width modulation sequence in said active section of the memory to trigger said pulse width modulator, said control module continuously receives and compares the input signals and the output signals to responsively select another pulse width modulation sequence from the look-up table and store said another pulse width sequence in said standby section, said control module switches between the standby section and the active section at a next zero crossing of the AC supply to maintain a current being drawn by the AC load substantially in phase relative to the voltage of the AC supply. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11, 12)
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7. A method of transferring an AC supply to an AC output with an AC load, the method comprising the steps of
monitoring frequency and voltage of the AC supply and generating input signals proportional thereto, converting the AC supply to DC, selecting from a look up table a pulse modulation sequence, storing the selected pulse modulation sequence in an active section of a memory and applying the selected pulse modulation sequence to the DC to initially generate an AC output, monitoring frequency and current of the AC output and generating output signals proportional thereto, analyzing the input signals of the AC supply and the output signals of the AC output, to determine a shape and amplitude of the AC supply and the AC output and responsively modifying the pulse width modulation sequence by determining whether the AC output is substantially in phase with the AC supply, and if substantially in phase, adjusting the voltage output waveform responsive to an amount of current being drawn by the AC load, and if out of phase, comparing the shape and amplitude of the AC output with stored shapes and amplitudes of known loads and selecting a closest one of said stored shapes and amplitudes and selecting from the look up table a pulse width modulation sequence corresponding to said closest one, storing the corresponding pulse width modulation sequence in a standby section of a memory and switching between the active section and the standby section at a next zero crossing of the AC supply to apply the corresponding pulse width modulation sequence to the DC, and repeating the steps of analyzing and modifying until the current of the AC output is substantially in phase with the voltage of the AC supply.
Specification