Power control system
First Claim
1. A power supply for providing an output voltage amplitude modulated by a command signal, comprising:
- first rectifier means for rectifying said command signal;
means for providing a plurality of reference voltages;
a plurality of comparator means for comparing the level of said rectified command signal individually with said plurality of reference voltages, respectively, each one of said plurality of comparator means changing the level of its output signal from "low" to "high" in response to said rectified command signal exceeding the level of the associated one of said reference voltages, respectively;
a plurality of output transformers each including a primary winding, and each sharing at least one common secondary winding, one end of each primary winding being connected in common;
a source of +E and -E volts DC;
first switching means for alternately and successively applying at a predetermined frequency +E and -E volts, respectively, to said one end of each one of said plurality of primary windings;
a plurality of second switching means, each having an output terminal connected individually to the other ends of said plurality of primary windings, for alternately and successively applying at said predetermined frequency +E and -E volts, respectively, to said other ends of each one of said plurality windings, respectively;
first control means responsive to the level of the output signals from said plurality of comparator means associated with individual ones of said plurality of second switching means, respectively, for (1) when a given one of said comparator means has a high output level operating the associated one of said plurality of second switching means for alternately and successively applying +E and -E volts across the associated said primary winding, in opposite polarity over each half-cycle of operation, for adding the voltage contribution from the associated primary winding to said secondary winding, and (2) when a given one of said comparator means has a low output level operating the associated one of said plurality of second switching means substantially asynchronously with said first switching means, for alternately and successively connecting the ends of an associated one of said primary windings to +E or -E volts over each half-cycle of operation, respectively, for removing that said primary windings voltage contribution from said secondary winding, thereby producing in said secondary winding a pulsed voltage waveform at said predetermined frequency, amplitude modulated by said command signal.
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Accused Products
Abstract
A power supply for providing an output voltage amplitude modulated by a command signal, includes a rectifier for rectifying the command signal, a comparator network for comparing the instantaneous rectified level of the command signal with a plurality of predetermined reference voltages, for producing a plurality of phasing signals, respectively, for operating a switching network to (1) alternately and successively connect positive and negative polarity DC voltages to the one ends of a primary windings of a plurality of transformers, and to (2) connect either the positive or the negative DC voltage to the other ends of the primary windings in different combinations, over each half-cycle of a clock signal, for producing in a common secondary winding for the transformers the amplitude modulated output voltage. Another rectifier may be provided for rectifying the AC output voltage, for producing a DC output voltage amplitude modulated by the command signal.
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Citations
17 Claims
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1. A power supply for providing an output voltage amplitude modulated by a command signal, comprising:
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first rectifier means for rectifying said command signal; means for providing a plurality of reference voltages; a plurality of comparator means for comparing the level of said rectified command signal individually with said plurality of reference voltages, respectively, each one of said plurality of comparator means changing the level of its output signal from "low" to "high" in response to said rectified command signal exceeding the level of the associated one of said reference voltages, respectively; a plurality of output transformers each including a primary winding, and each sharing at least one common secondary winding, one end of each primary winding being connected in common; a source of +E and -E volts DC; first switching means for alternately and successively applying at a predetermined frequency +E and -E volts, respectively, to said one end of each one of said plurality of primary windings; a plurality of second switching means, each having an output terminal connected individually to the other ends of said plurality of primary windings, for alternately and successively applying at said predetermined frequency +E and -E volts, respectively, to said other ends of each one of said plurality windings, respectively; first control means responsive to the level of the output signals from said plurality of comparator means associated with individual ones of said plurality of second switching means, respectively, for (1) when a given one of said comparator means has a high output level operating the associated one of said plurality of second switching means for alternately and successively applying +E and -E volts across the associated said primary winding, in opposite polarity over each half-cycle of operation, for adding the voltage contribution from the associated primary winding to said secondary winding, and (2) when a given one of said comparator means has a low output level operating the associated one of said plurality of second switching means substantially asynchronously with said first switching means, for alternately and successively connecting the ends of an associated one of said primary windings to +E or -E volts over each half-cycle of operation, respectively, for removing that said primary windings voltage contribution from said secondary winding, thereby producing in said secondary winding a pulsed voltage waveform at said predetermined frequency, amplitude modulated by said command signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power supply for an audio amplifier, for supplying a voltage varying in accordance with an audio signal being amplified by said audio amplifier, comprising:
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first rectifier means for rectifying said audio signal; oscillator means for producing X and Y clock signals, the X clock signals being 180°
out of phase with the Y clock signals;means for producing a plurality of DC reference voltages of successively lower predetermined DC levels; a DC source of +E volts and -E volts; a plurality of comparator means for comparing levels of reference voltages with the level of said rectified audio signals, respectively, each one of said comparator means changing its output signal from a "low" to a "high" level whenever the level of its associated reference voltage is exceeded by the level of said rectified audio signal; a plurality of transformers each including a primary winding, and each sharing at least one secondary winding, one end of each one of said primary windings being connected in common; a plurality of pairs of gating means, each pair being responsive to the output signal from an individual one of said plurality of comparator means, respectively, being either (1) "low" for passing the X and Y clock signals, or (2) "high" for inverting said X and Y clock signals, and outputting the gated clock signals on first and second signal lines, respectively; first complementary switching means directly responsive to said X and Y clock signals, for applying (1) +E volts to said one ends of said plurality of primary windings, whenever X is "low" and "Y" is "high", and (2) -E volts thereto whenever X is "high" and Y is "low"; a plurality of second complementary switching means each individually responsive to the signals on said first and second signal lines from individual ones of said pairs of gating means, respectively, for applying individually to the other ends of said plurality of primary windings, respectively, (1) +E volts whenever the associated ones of said first and second signal lines are "low" and "high", and (2) -E volts whenever said first and second signal lines are "high" and "low", respectively, thereby in combination with said plurality of first complementary switching means, causing either (1) said plurality of primary windings to be shorted whenever an associated one of said plurality of comparator means has a "low" output signal, respectively, preventing any voltage contribution from that primary winding to said secondary winding, or (2) said plurality of primary windings to alternately and successively have opposite polarity voltage pulses connected thereacross over each half-cycle of said X and Y clock signals, whenever an associated one of said plurality of comparator means has a "high" output signal, respectively, whereby a pulsed AC signal amplitude modulated by said audio signal is induced in said secondary winding; and second rectifier means connected across said secondary winding, for rectifying the voltage developed in said secondary winding to provide said amplitude modulated DC voltage. - View Dependent Claims (13, 14)
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15. A power supply for an audio amplifier, for supplying a voltage varying in accordance with an audio signal being amplified by said audio amplifier, comprising:
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first rectifier means for rectifying said audio signal; means for producing a plurality of DC reference voltages of successively lower predetermined DC levels; a source of direct voltage; a plurality of comparator means for comparing levels of reference voltages with the level of said rectified audio signals, respectively, each one of said comparator means changing its output signal from a "low" to a "high" level whenever the level of its associated reference voltage is exceeded by the level of said rectified audio signal; a plurality of transformers each having a primary winding, and each sharing a common secondary winding; switching means for (1) selectively rendering ineffective either one or a combination of said plurality of primary windings, and (2) periodically applying said direct voltage across the remaining ones of said plurality of primary windings for causing pulses of current to flow through these windings in a given direction, thereby causing voltage pulses of desired amplitude, polarity, and duration to be induced into said secondary winding; and control means for operating said switching means at a predetermined frequency and responsive to the output signals from said plurality of comparator means, respectively, for producing said voltage pulses in said secondary winding at said predetermined frequency and amplitude modulated in correspondence with said command signal. - View Dependent Claims (16, 17)
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Specification