Phase modulated switchmode power amplifier and waveform generator
First Claim
Patent Images
1. A phase modulated switchmode amplifier apparatus comprising:
- input power terminals adapted to be connected to a source of electrical power;
transformer means having primary winding and secondary winding means;
first electronic switch means for connecting said primary winding means to said input power terminals;
reference signal means connected for selectively switching said first switch means so that an alternating type current is induced in said secondary winding means;
an output circuit adapted to be connected to suitable load means;
second electronic switch means connecting said secondary winding means to said output circuit;
second phase-displaced signal means connected for switching said second switch means, said second signal normally being phase-displaced by 90°
from said reference signal to cause switching of said second switch means to occur 90°
displaced from the switching of said first switch means; and
,phase modulation means connected to said second signal means for shifting the phase displacement of said second signal to 90°
±
ρ
°
in response to a modulation signal where ρ
is any number of degrees from 0 to 90.
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Abstract
A phase modulated DC-to-AC or a DC-to-DC power converter utilizes input terminals connected to a source of power and output terminals connected to a suitable load. The transfer of power between the power source and the load or from the load back to the power source is accomplished by electronic switching that is phase displaced controlled in all four quadrants.
186 Citations
13 Claims
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1. A phase modulated switchmode amplifier apparatus comprising:
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input power terminals adapted to be connected to a source of electrical power; transformer means having primary winding and secondary winding means; first electronic switch means for connecting said primary winding means to said input power terminals; reference signal means connected for selectively switching said first switch means so that an alternating type current is induced in said secondary winding means; an output circuit adapted to be connected to suitable load means; second electronic switch means connecting said secondary winding means to said output circuit; second phase-displaced signal means connected for switching said second switch means, said second signal normally being phase-displaced by 90°
from said reference signal to cause switching of said second switch means to occur 90°
displaced from the switching of said first switch means; and
,phase modulation means connected to said second signal means for shifting the phase displacement of said second signal to 90°
±
ρ
°
in response to a modulation signal where ρ
is any number of degrees from 0 to 90. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11)
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10. A phase modulated switchmode amplifier apparatus comprising:
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input power terminals adapted to be connected to a source of electrical power; transformer means having primary winding and secondary winding means; first and second electronic switch means for connecting said primary winding means to said input power terminals; reference signal means connected in controlling relation to said first and second switch means for alternately switching "on" said first and second switch means so that an alternating type current is induced in said secondary winding means;
an output circuit adapted to be connected to suitable load means;third and fourth electronic switch means connecting said secondary winding means to said output circuit; second phase-displaced signal means connected to said third and fourth switch means for inversely switching said third and fourth switch means, said second signal normally being phase-displaced by 90°
from said reference signal to cause switching of said third and fourth switch means to occur 90°
displaced from the switching of said first and second switch means; and
,phase modulation means connected to said second signal means for shifting the phase displacement of said second signal to 90°
±
ρ
°
in response to a modulation signal where ρ
is any number of degrees from 0 to 90. - View Dependent Claims (12)
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13. Harmonic distortion reduction apparatus for AC power lines comprising:
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current sensing means for measuring the power lines supply current and any harmonic content thereof; digital filter means for extracting a true sinusoidal signal from the measured current waveform; subtraction means for subtracting the extracted true sinusoidal signal from the measured current waveform to form a measurement of the harmonic residual; switchmode power amplifier means to reproduce the residual harmonic current with opposite phase for introduction into said power lines, said switchmode power amplifier means comprising; input power terminals adapted to be connected to a source of electrical power; transformer means having primary winding and secondary winding means; first electronic switch means for connecting said primary winding means to said input power terminals; reference signal means connected for selectively switching said first switch means so that an alternating type current is induced in said secondary winding means; an output circuit adapted to be connected to said power lines for introducing the cancelling harmonic current into said power lines; second electronic switch means connecting said secondary winding means to said output circuit; second phase-displaced signal means connected for switching said second switch means, said second signal normally being phase-displaced by 90°
from said reference signal to cause switching of said second switch means to occur 90°
displaced from the switching of said first switch means; and
,phase modulation means connected to said second signal means for shifting the phase displacement of said second signal to 90°
±
ρ
°
in response to a modulation signal where ρ
is any number of degrees from 0 to 90.
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Specification