Voltage waveform synthesizer and a system that includes the same
First Claim
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1. An electronic waveform synthesizer having, in combination:
- a first unit comprising a stage that includes dc or unidirectional supply voltage means whose output voltage is at the amplitude E and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage;
a second unit comprising a stage that includes dc or unidirectional supply voltage means whose output voltage is at the amplitude E and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage;
electronic mixer means connected to the first unit and the second unit, said electronic mixer means comprising a plurality of bilateral mixer switches connected to receive the dc or unidirectional electric potential of the dc or unidirectional supply voltage means of the stage of each unit and operable to process the same in a determined and programmable fashion so that there appears at an output port of the electronic waveform synthesizer a waveform that is alternating in nature even though the supply voltage means of each stage and each unit is dc or unidirectional in nature the output of the electronic mixer means being the output that appears at said output port; and
control logic means that serves to activate the bilateral stage switch means of both the first unit and the second unit, as well as the electronic mixer switch means, in a programmable fashion.
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Abstract
A voltage waveform synthesizer whereby an ac waveform (which may be varied in frequency) is synthesized from dc or unidirectional voltages in a programmable fashion, the power carried by the waveform being controllable from zero to some maximum value and the harmonic content of the waveform also being controllable. The synthesizer per se is described and it is shown in combination with a rotating electric machine to provide, for example, a variable speed drive mechanism.
35 Citations
43 Claims
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1. An electronic waveform synthesizer having, in combination:
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a first unit comprising a stage that includes dc or unidirectional supply voltage means whose output voltage is at the amplitude E and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage; a second unit comprising a stage that includes dc or unidirectional supply voltage means whose output voltage is at the amplitude E and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage; electronic mixer means connected to the first unit and the second unit, said electronic mixer means comprising a plurality of bilateral mixer switches connected to receive the dc or unidirectional electric potential of the dc or unidirectional supply voltage means of the stage of each unit and operable to process the same in a determined and programmable fashion so that there appears at an output port of the electronic waveform synthesizer a waveform that is alternating in nature even though the supply voltage means of each stage and each unit is dc or unidirectional in nature the output of the electronic mixer means being the output that appears at said output port; and control logic means that serves to activate the bilateral stage switch means of both the first unit and the second unit, as well as the electronic mixer switch means, in a programmable fashion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 37, 38, 39)
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26. An electronic ac waveform synthesizer having, in combination:
- a plurality of stages, each stage comprising dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage as well as to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage; and
control logic means that serves to activate the bilateral stage switch means to determine the shape of said ac waveform, the control logic means controlling the switching of the bilateral stage switch means such that the waveform synthesized comprises a plurality of steps forming each half wavelength thereof, the steps that form each half wavelength of the synthesized ac waveform comprising substantially fixed amplitude pulses whose pulse widths are much less than half the wavelength of the ac waveform synthesized, at least one of the pulse width and the pulse timing being controlled by the control logic means to establish an acceptable level of harmonic content in the waveform. - View Dependent Claims (27, 28, 40, 41, 42)
- a plurality of stages, each stage comprising dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage as well as to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage; and
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29. An electronic rotating machine that comprises, in combination:
- a plurality of electronic waveform synthesizers each of which comprises a plurality of stages, each stage comprising dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage as well as to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage, and control logic means that serve to activate the bilateral stage switch means to determine the shape of said waveform, the control logic means controlling the switching of the bilateral stage switch means such that the waveform synthesized is quasi-sinusoidal and comprises square waves whose widths are variable over a wide range to control the rms voltage of the waveform and hence the power delivered by the synthesizers, each half cycle of the wave synthesized comprising a plurality of said square waves, which square waves comprise many pulses whose widths are much less than the half wavelength of the synthesized at least one of the pulse width and the pulse timing being controlled by the control logic means to establish an acceptable level of harmonic content in the waveforms; and
a polyphase rotating electric machine connected to the plurality of waveform synthesizers. - View Dependent Claims (30, 31)
- a plurality of electronic waveform synthesizers each of which comprises a plurality of stages, each stage comprising dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage as well as to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage, and control logic means that serve to activate the bilateral stage switch means to determine the shape of said waveform, the control logic means controlling the switching of the bilateral stage switch means such that the waveform synthesized is quasi-sinusoidal and comprises square waves whose widths are variable over a wide range to control the rms voltage of the waveform and hence the power delivered by the synthesizers, each half cycle of the wave synthesized comprising a plurality of said square waves, which square waves comprise many pulses whose widths are much less than the half wavelength of the synthesized at least one of the pulse width and the pulse timing being controlled by the control logic means to establish an acceptable level of harmonic content in the waveforms; and
- 32. An electronic alternating waveform synthesizer having, in combination, dc or unidirectional supply voltage means comprising a plurality of dc or unidirectional electric power supplies, switch means operable to connect the dc or unidirectional power supplies to an output port of the synthesizer, control logic means connected to activate the switch means in a programmable fashion so that there appears at said output port an electric waveform that is alternating in nature even though the supply voltage means is dc or unidirectional in nature, each half cycle of the waveform being formed solely of a plurality of steps or square waves of electric energy from the dc or unidirectional supply voltage means, said control logic means being adapted to control the width of said steps or square waves to monitor the interchange of electric energy at said port, each half-cycle of the waveform synthesized comprising many substantially fixed amplitude pulses, at least one of pulse width and pulse timing being controllable by the control logic means to establish an acceptable level of harmonic content in the waveform, the control logic means being operable to control the switch means to generate said pulses with pulse widths of the pulses forming each half-cycle much less than half the wavelength of the ac waveform synthesized.
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34. Apparatus that comprises, in combination:
- a polyphase load and a voltage waveform synthesizer interconnected to permit the apparatus to connect to a single phase line, one phase of the polyphase load being adapted to connect directly to the single phase line and another phase thereof being connected through the voltage waveform synthesizer to the single phase line, said synthesizer comprising a first unit comprising a stage that includes dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage, a second unit comprising a stage that includes dc or unidirectional supply voltage means and bilateral stage switch means, the bilateral stage switch means serving to control electric current flow in the dc or unidirectional supply voltage means of the stage and serving as well to effect an electrical bypass of the dc or unidirectional supply voltage means of the stage, electronic mixer means connected to the first unit and the second unit, said electronic mixer means comprising a plurality of bilateral mixer switches connected to receive the dc or unidirectional electric potential of the dc or unidirectional supply voltage means of the stage of each unit and operable to process the same in a determined and programmable fashion so that there appears at an output port of the electronic waveform synthesizer a waveform that is alternating in nature even though the supply voltage means of each stage and each unit is dc or unidirectional in nature, and control logic means that serves to activate the bilateral stage switch means of both the first unit and the second unit, as well as the electronic mixer switch means, in a programmable fashion.
- View Dependent Claims (35, 36)
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43. An electronic waveform synthesizer having, in combination a plurality of dc sources, switch means operable to connect the plurality of dc sources to an output port of the synthesizer, control logic means connected to activate the switch means in a programmable fashion so that there appears at said output port and electric waveform as a plurality of square waves of electric energy formed solely by combining the dc sources, said control logic means being operable to control the width of said square waves and being operable, as well, to form a square wave of a plurality of fixed amplitude pulses, at least one of pulse width and pulse timing being controllable by the control logic means to establish an acceptable level of harmonic content in said square wave, the control logic means being operable to control the switch means to generate said pulses with pulse widths of the pulses forming said square wave much less than the width of the square wave.
Specification