Source: http://www.google.de/patents/US6285251
Timestamp: 2017-11-25 05:57:46
Document Index: 302768331

Matched Legal Cases: ['application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 09']

Patent US6285251 - Amplification systems and methods using fixed and modulated power supply ... - Google Patentsuche
A signal of varying amplitude in a first saturated power amplifier that operates from a fixed voltage power supply to produce a first output signal of constant amplitude. The signal of varying amplitude also is amplified in a second saturated power amplifier that operates from a modulated voltage power...http://www.google.de/patents/US6285251?utm_source=gb-gplus-sharePatent US6285251 - Amplification systems and methods using fixed and modulated power supply voltages and buck-boost control
Veröffentlichungsnummer US6285251 B1
Anmeldenummer US 09/640,408
Eingetragen 17. Aug. 2000
Auch veröffentlicht unter CN1264274C, CN1493106A, CN1893258A, CN100557948C, DE60140381D1, EP1364456A2, EP1364456B1, US6369651, US20010030581, WO2002015387A2, WO2002015387A3
Veröffentlichungsnummer 09640408, 640408, US 6285251 B1, US 6285251B1, US-B1-6285251, US6285251 B1, US6285251B1
Erfinder Paul Wilkinson Dent, William O. Camp, Jr.
Patentzitate (54), Nichtpatentzitate (13), Referenziert von (195), Klassifizierungen (39), Juristische Ereignisse (4)
US 6285251 B1
1. A method of amplifying a signal of varying amplitude comprising:
amplifying the signal of varying amplitude in a first saturated power amplifier that operates from a fixed voltage power supply to produce a first output signal of constant amplitude;
amplifying the signal of varying amplitude in a second saturated power amplifier that operates from a modulated voltage power supply to produce a second output signal of amplitude that depends on the signal of varying amplitude, the modulated power supply voltage and on an invert/noninvert control signal;
combining the first and second output signals into a load; and
modulating the modulated voltage power supply while generating the invert/noninvert control signal such that the combined first and second output signals into the load amplify the signal of varying amplitude.
2. The method according to claim 1 wherein the signal of varying amplitude is of varying amplitude and varying phase.
wherein the signal of varying amplitude includes an in-phase component and a quadrature-phase component;
wherein the amplifying the signal of varying amplitude in a first saturated power amplifier comprises amplifying the in-phase component of the signal of varying amplitude in a first saturated power amplifier that operates from a first fixed voltage power supply to produce a first output signal of constant amplitude;
wherein the amplifying the signal of varying amplitude in a second saturated power amplifier comprises amplifying the in-phase component of the signal of varying amplitude in a second saturated power amplifier that operates from a first modulated voltage power supply to produce a second output signal of amplitude that depends on the in-phase component of the signal of varying amplitude, the first modulated power supply voltage and on a first invert/noninvert control signal;
amplifying the quadrature-phase component of the signal of varying amplitude in a third saturated power amplifier that operates from a second fixed voltage power supply to produce a third output signal of constant amplitude; and
amplifying the quadrature-phase component of the signal of varying amplitude in a fourth saturated power amplifier that operates from a second modulated voltage power supply to produce a fourth output signal of amplitude that depends on the quadrature-phase component of the signal of varying amplitude, the second modulated power supply voltage and on a second invert/noninvert control signal;
wherein the combining comprises combining the first, second, third and fourth output signals into a load; and
wherein the modulating comprises modulating the first and second modulated voltage power supplies while generating the first and second invert/noninvert control signals such that the combined first, second, third and fourth output signals into the load amplify the signal of varying amplitude.
11. A system for amplifying a signal of varying amplitude, comprising:
a fixed voltage power supply;
a modulated voltage power supply;
a first saturated power amplifier that is responsive to the signal of varying amplitude and that is powered by the fixed voltage power supply to produce a first output signal of constant amplitude;
a second saturated power amplifier that is responsive to the signal of varying amplitude and to an invert/noninvert control signal and that is powered by the modulated voltage power supply to produce a second output signal of amplitude that depends on the signal of varying amplitude, the modulated power supply voltage and on the invert/noninvert control signal;
a coupler that couples the first and second output signals to a load; and
a controller that modulates the modulated voltage power supply while generating the invert/noninvert control signal.
12. The system according to claim 11 wherein the signal of varying amplitude is of varying amplitude and varying phase.
a switch controller that simultaneously closes the first switch and opens the second switch, that simultaneously opens the first switch and closes the second switch and that maintains the first switch closed and the second switch open for a percentage of time that approximates a ratio of the second voltage to the first voltage.
20. The system according to claim 11:
wherein the first saturated power amplifier is responsive to the in-phase component of the signal of varying amplitude and is powered by the fixed voltage power supply to produce the first output signal of constant amplitude;
wherein the second saturated power amplifier is responsive to the in-phase component of the signal of varying amplitude and to the invert/noninvert control signal and is powered by the modulated voltage power supply to produce the second output signal of amplitude that depends on the signal of varying amplitude, the modulated power supply voltage and on the invert/noninvert control signal;
a third saturated power amplifier that is responsive to the quadrature-phase component of the signal of varying amplitude and that is powered by a second fixed voltage power supply to produce a third output signal of constant amplitude; and
a fourth saturated power amplifier that is responsive to the quadrature-phase component of the signal of varying amplitude and that is powered by a second modulated voltage power supply to produce a fourth output signal of amplitude that depends on the quadrature-phase component of the signal of varying amplitude, the second modulated power supply voltage and on a second invert/noninvert control signal;
wherein the coupler couples the first, second, third and fourth output signals into a load; and
wherein the controller modulates the first and second modulated voltage power supplies while generating the first and second invert/noninvert control signals such that the combined first, second, third and fourth output signals into the load amplify the signal of varying amplitude.
21. A system for amplifying a signal of varying amplitude, comprising:
first means for amplifying the signal of varying amplitude from a fixed voltage power supply to produce a first output signal of constant amplitude;
second means for amplifying the signal of varying amplitude from a modulated voltage power supply to produce a second output signal of amplitude that depends on the signal of varying amplitude, the modulated power supply voltage and on an invert/noninvert control signal;
means for combining the first and second output signals into a load; and
means for modulating the modulated voltage power supply while generating the invert/noninvert control signal such that the combined first and second output signals into the load amplify the signal of varying amplitude.
22. The system according to claim 21 wherein the signal of varying amplitude is of varying amplitude and varying phase.
wherein the first means for amplifying comprises first means for amplifying the in-phase component of the signal of varying amplitude from a first fixed voltage power supply to produce a first output signal of constant amplitude;
wherein the second means for amplifying comprises second means for amplifying the in-phase component of the signal of varying amplitude from a first modulated voltage power supply to produce a second output signal of amplitude that depends on the in-phase component of the signal of varying amplitude, the first modulated power supply voltage and on a first invert/noninvert control signal;
third means for amplifying the quadrature-phase component of the signal of varying amplitude from a second fixed voltage power supply to produce a third output signal of constant amplitude; and
fourth means for amplifying the quadrature-phase component of the signal of varying amplitude from a second modulated voltage power supply to produce a fourth output signal of amplitude that depends on the quadrature-phase component of the signal of varying amplitude, the second modulated power supply voltage and on a second invert/noninvert control signal;
wherein the means for combining comprises means for combining the first, second, third and fourth output signals into a load; and
wherein the means for modulating comprises means for modulating the first and second modulated voltage power supplies while generating the first and second invert/noninvert control signals such that the combined first, second, third and fourth output signals into the load amplify the signal of varying amplitude.
31. A method of amplifying a signal, comprising:
generating a first input signal, a second input signal, an invert/noninvert control signal and a variable power supply voltage from the signal;
amplifying the first input signal using a fixed power supply voltage, to produce a first output signal;
selectively invertingly and noninvertingly amplifying the second input signal using the variable power supply voltage in response to the invert/noninvert control signal, to produce a second output signal; and
coupling the first and second output signals into a load to thereby amplify the signal.
32. The method according to claim 31 wherein the selectively invertingly and noninvertingly amplifying the second input signal comprises selectively drawing current from the modulated voltage power supply and selectively supplying current to the modulated voltage power supply.
wherein the signal includes an in-phase component and a quadrature-phase component;
wherein the generating comprises generating a first in-phase input signal, a second in-phase input signal, a third quadrature-phase input signal and a fourth quadrature-phase input signal, a first invert/noninvert control signal, a second invert/noninvert control signal, a first variable power supply voltage and a second variable power supply voltage from the in-phase component and the quadrature-phase component;
wherein the amplifying the first input signal comprises amplifying the first in-phase input signal using a first fixed power supply voltage, to produce the first output signal;
wherein the selectively invertingly and noninvertingly amplifying the second input signal comprises selectively invertingly and noninvertingly amplifying the second in-phase input signal using the first variable power supply voltage in response to the first invert/noninvert control signal, to produce the second output signal;
amplifying the third quadrature-phase input signal using a second fixed power supply voltage, to produce a third output signal; and
selectively invertingly and noninvertingly amplifying the fourth quadrature-phase input signal using the second variable power supply voltage in response to the second invert/noninvert control signal, to produce a fourth output signal; and
wherein the coupling step comprises coupling the first, second, third and fourth output signals into a load to thereby amplify the signal.
37. A system for amplifying a signal, comprising:
means for generating a first input signal, a second input signal, an invert/noninvert control signal and a variable power supply voltage from the signal;
means for amplifying the first input signal using a fixed power supply voltage, to produce a first output signal;
means for selectively invertingly and noninvertingly amplifying the second input signal using the variable power supply voltage in response to the invert/noninvert control signal, to produce a second output signal; and
means for coupling the first and second output signals into a load to thereby amplify the signal.
38. The system according to claim 37 wherein the means for selectively invertingly and noninvertingly amplifying the second input signal comprises means for selectively drawing current from the variable power supply voltage and for selectively supplying current to the variable power supply voltage.
wherein the means for generating comprises means for generating a first in-phase input signal, a second in-phase input signal, a third quadrature-phase input signal and a fourth quadrature-phase input signal, a first invert/noninvert control signal, a second invert/noninvert control signal, a first variable power supply voltage and a second variable power supply voltage from the in-phase component and the quadrature-phase component;
wherein the means for amplifying the first input signal comprises means for amplifying the first in-phase input signal using a first fixed power supply voltage, to produce the first output signal;
wherein the means for selectively invertingly and noninvertingly amplifying the second input signal comprises means for selectively invertingly and noninvertingly amplifying the second in-phase input signal using the first variable power supply voltage in response to the first invert/noninvert control signal, to produce the second output signal; the system further comprising:
means for amplifying the third quadrature-phase input signal using a second fixed power supply voltage, to produce a third output signal; and
means for selectively invertingly and noninvertingly amplifying the fourth quadrature-phase input signal using the second variable power supply voltage in response to the second invert/noninvert control signal, to produce a fourth output signal; and
wherein the means for coupling comprises means for coupling the first, second, third and fourth output signals into a load to thereby amplify the signal.
43. A system for amplifying a signal, comprising:
a signal generator that generates a first input signal, a second input signal, an invert/noninvert control signal and a variable power supply voltage from the signal;
a first power amplifier that amplifies the first input signal using a fixed power supply voltage, to produce a first output signal;
a second power amplifier that selectively invertingly and noninvertingly amplifies the second input signal using the variable power supply voltage in response to the invert/noninvert control signal, to produce a second output signal; and
a coupler that couples the first and second output signals into a load to thereby amplify the signal.
44. The system according to claim 43 wherein the second power amplifier selectively draws current from the modulated voltage power supply and selectively supplies current to the modulated voltage power supply.
wherein the signal generator generates a first in-phase input signal, a second in-phase input signal, a third quadrature-phase input signal and a fourth quadrature-phase input signal, a first invert/noninvert control signal, a second invert/noninvert control signal, a first variable power supply voltage and a second variable power supply voltage from the in-phase component and the quadrature-phase component;
wherein the first power amplifier amplifies the first in-phase input signal using a first fixed power supply voltage, to produce the first output signal;
wherein the second power amplifier selectively invertingly and noninvertingly amplifies the second in-phase input signal using the first variable power supply voltage in response to the first invert/noninvert control signal, to produce the second output signal;
a third power amplifier that amplifies the third quadrature-phase input signal using a second fixed power supply voltage, to produce a third output signal; and
a fourth power amplifier that selectively invertingly and noninvertingly amplifies the fourth quadrature-phase input signal using the second variable power supply voltage in response to the second invert/noninvert control signal, to produce a fourth output signal; and
wherein the coupler couples the first, second, third and fourth output signals into a load to thereby amplify the signal.
49. The system according to claim 43 wherein the signal generator comprises a bidirectional Direct Current (DC) power conversion circuit that transfers DC power in a forward direction from a first terminal at a first voltage to a second terminal at a second voltage, wherein the first voltage is higher than the second voltage relative to a common voltage at a common terminal, and in a reverse direction from the second terminal at the second voltage to the first terminal at the first voltage, the bidirectional DC power conversion circuit comprising:
50. A method of amplifying a signal, comprising:
generating first and second input signals and first and second variable power supply voltages from the signal;
amplifing the first input signal using the first variable power supply voltage, to produce a first output signal;
amplifying the second input signal using the second variable power supply voltage, to produce a second output signal; and
51. The method according to claim 50 wherein the coupling comprises coupling one of the first and second output signals directly to the load and coupling the other of the first and second output signals to the load via an isolation transformer.
means for generating first and second input signals and first and second variable power supply voltages from the signal;
first means for amplifying the first input signal using the first variable power supply voltage, to produce a first output signal;
second means for amplifying the second input signal using the second variable power supply voltage, to produce a second output signal; and
54. The system according to claim 53 wherein the means for coupling comprises means for coupling one of the first and second output signals directly to the load and means for coupling the other of the first and second output signals to the load via an isolation transformer.
a signal generator that generates first and second input signals and first and second variable power supply voltages from the signal;
a first power amplifier that amplifies the first input signal using the first variable power supply voltage, to produce a first output signal;
a second power amplifier that selectively amplifies the second input signal using the second variable power supply voltage, to produce a second output signal; and
57. The system according to claim 56 wherein the coupler comprises a direct connector of one of the first and second output signals to the load and an isolation transformer that connects the other of the first and second output signals to the load.
With a varying output signal power P(t)=A2(t), the average efficiency can be estimated to be: Max   efficiency × average   of   ( P  ( t ) / P   max ) average   of   square   root   ( P  ( t ) / P   max ) or Max   efficiency × average   of   ( A  ( t ) / A   max ) 2 average   of   ( A  ( t ) / A   max ) .
If the power amplifiers generate relatively phased currents Vcc·EXP(jα) and Vcc·EXP(−jα), then the total output current is: Io = VCC  ( ( EXP  ( jα ) Zo + EXP  ( - jα ) Zo ) = 2  Vcc · Cos  ( α ) / Zo ,
That the theoretical efficiency using ideal bilateral devices is 100% may be understood in the context of a single ended push-pull output stage, as shown in FIG. 6. In region “a” from 0 to (π−α), the current flows from −Vcc/2 to the load, while the N-type device is on, pulling down. This is delivering energy from −Vcc/2 source 328 b to the load. In region “b”, current is still negative, but the P-type device is on. That means current and energy are flowing back towards the +Vcc/2 source 328 a. In region “c”, current is flowing from the Vcc/2 328 a source to the load while the P-type device is on, and in region “d”, current is still negative when the N-type device comes on, sending current and energy back to the −Vcc/2 source 328 b. The mean currents are thus: Ipk 2  π  [ ∫ 0 π - α  sin  ( θ )  δθ - ∫ 0 α  sin  ( θ )  δθ ] = I pk  cos  ( α ) / π
The loud power is thus ½×peak current×peak voltage: = 2  Vcc 2 · R L ( π · Zo 2 ) ( 4 )
and e(jwt+φ4)
a desired complex waveform and the largest |φ(k)| is minimized.
a desired complex waveform and ∑ k = 1 N   φ .  ( k )  2
Splitting the above complex equation involving Z into its real and imaginary constituent waveforms I and Q, and defining the 2×N matrix A as: [ A ] = [ cos  ( φ1 )  cos  ( φ2 )   …   cos  ( φ N ) sin  ( φ1 )  sin  ( φ2 )   …   sin  ( φ N ) ]
The above equation is a set of N, non-linear differential equations which can in principle be solved for the N phase waveforms, given the desired complex signal waveform Z(t), in terms of its real part I(t) and its imaginary part Q(t). Such a solution may be onerous to perform in real time, but as digital processors become ever more powerful and the real-time solution method may soon, if not already, be an economically practical implementation. The problem can be stated in discrete time steps of dt to obtain phase waveform samples in steps of dt, given the values of Z(t) at discrete steps dt as
The values of the phases at time step number “i” can then be derived from the above differential equation to be: ( φ1 φ2 ⋮ φ N ) i = A #  [ A · A # ] - 1  ( Q  ( i ) - Q _  ( i - 1 ) I _  ( i - 1 ) - I  ( i ) ) ) + ( φ1 φ2 ⋮ φ N ) i - 1
where {overscore (I, Q)} are the previously achieved values given by I _  ( I - 1 ) + j   Q _  ( I - 1 ) = ∑ k = 1 N   jφ   k  ( i - 1 ) .
The current in an inductor does not reduce to zero immediately and therefore the voltage on D1 flies negatively until D1 clamps it just below ground potential. The current for the remainder of the switching cycle flows from ground potential. The current I flows from the source for a fraction Vcc2/Vcc1 of the time at the source voltage of Vcc2. The average power supplied by the source 2110 is thus (Vcc2/Vcc1) ×Vcc1×I=Vcc2×I. The current I flows continuously into the amplifier 2120 at a voltage of Vcc2, so the power consumed is Vcc2×I, equal to the power delivered by the source. The efficiency of conversion from voltage Vcc1 to voltage Vcc2 is thus 100% when losses such as the diode drop of D1 are neglected. The switch controller 2130 preferably senses the voltage Vcc2 at the amplifier and controls the switch on/off ratio to achieve the desired value, thereby forming a feedback control system.
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US-Klassifikation 330/127, 330/124.00R
Internationale Klassifikation H03F3/04, H02M3/158, H03F1/02, H03G3/00, H03F3/68, H03F, H03F1/32, H04L27/20, H03F3/217, H03F3/189
Unternehmensklassifikation H03F2200/543, H03F1/0288, H03G3/004, H03F2200/504, H03F1/0227, H03F2200/331, H03G3/3042, H03F2200/336, H03F2200/432, H03F2200/324, H03F2200/198, H03F2203/21142, H03F1/0294, H03F3/211, H03F2200/516, H03F3/602, H02M3/1582, H03F2200/537, H03F2200/541
Europäische Klassifikation H02M3/158B, H03F1/02T5, H03F1/02T1C1K, H03F1/02T6, H03G3/30D2, H03F3/21C, H03F3/60C, H03G3/00P
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DENT, PAUL WILKINSON;CAMP, WILLIAM O., JR.;REEL/FRAME:011026/0049;SIGNING DATES FROM 20000808 TO 20000811