Precision switching power amplifier comprising instantaneously interruptible power source
First Claim
1. Switching power apparatus providing an AC output voltage in response to an AC input signal comprising:
- a power supply means for providing at least one supply voltage;
a first and second inductive means for attaining a first and second corrective currents, and providing a first and second return voltages respectively;
a first and second rectifying means for limiting the first and second return voltages respectively;
a capacitive means for providing the AC output voltage;
a first switching means having a first reference terminal and a first supply terminal, and coupled in series with the first inductive means for selectively applying the first corrective current between the power supply means and the capacitive means;
a second switching means having a second reference terminal and a second supply terminal, and coupled in series with the second inductive means for selectively applying the second corrective current between the power supply means and the capacitive means; and
a converter means having a first and second input terminals for converting a voltage appearing therebetween and providing a supply current to at least one supply terminal, wherein the first input terminal is coupled to one of the terminals of the first switching means and the second input terminal is coupled to one of the terminals of the second switching means.
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Abstract
The amplifier comprises instantaneously interruptible power source (I2PS) for producing a precise AC output voltage. A continuous mode I2PS can be built using only 7 power components, including two inductors and an output capacitor. The I2PS can instantaneously interrupt the correction and become idle. The inductors each attain a corrective current and provide a return voltage. Two switches are separately coupled in series with the inductors for selectively applying the respective corrective currents between the power supply and the output capacitor. Two diodes limit the return voltages. A converter converts the supply voltage or an internal voltage into an internal supply current. A fine amplifier can employ two low power transistors to rapidly deliver a fine current to the output capacitor. This dramatically reduces output noise and improves accuracy. The converter and the fine amplifier can be combined or used separately. The I2PS having unity gain is most accurate and requires a simple preamplifier.
30 Citations
20 Claims
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1. Switching power apparatus providing an AC output voltage in response to an AC input signal comprising:
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a power supply means for providing at least one supply voltage;
a first and second inductive means for attaining a first and second corrective currents, and providing a first and second return voltages respectively;
a first and second rectifying means for limiting the first and second return voltages respectively;
a capacitive means for providing the AC output voltage;
a first switching means having a first reference terminal and a first supply terminal, and coupled in series with the first inductive means for selectively applying the first corrective current between the power supply means and the capacitive means;
a second switching means having a second reference terminal and a second supply terminal, and coupled in series with the second inductive means for selectively applying the second corrective current between the power supply means and the capacitive means; and
a converter means having a first and second input terminals for converting a voltage appearing therebetween and providing a supply current to at least one supply terminal, wherein the first input terminal is coupled to one of the terminals of the first switching means and the second input terminal is coupled to one of the terminals of the second switching means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
a third inductive means coupled to the first inductive means for providing a third return voltage;
a third rectifying means for applying the first return voltage to the second supply terminal, wherein the first rectifying means limits the third return voltage, further wherein the first reference terminal is coupled to the power supply means and the first input terminal is coupled to the first inductive means, and still further wherein the second reference terminal and the second input terminal are coupled to the capacitive means.
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3. Switching power apparatus of claim 1 wherein the converter means includes:
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a third inductive means for attaining the supply current and providing a third return voltage;
a third switching means for selectively applying the voltage appearing between the first and second input terminals to the third inductive means; and
a third rectifying means for limiting the third return voltage.
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4. Switching power apparatus of claim 3 wherein at least one reference terminal is coupled to the capacitive means,
further wherein the supply voltage is applied between the first and second input terminals, and still further wherein the third rectifying means is coupled to the third switching means for applying the supply current to at least one supply terminal. -
5. Switching power apparatus of claim 1 wherein the first and second reference terminals are coupled to the power supply means,
and further wherein the first and second input terminals are coupled to the first and second supply terminals respectively. -
6. Switching power apparatus of claim 1 wherein the first and second reference terminals are coupled to the power supply means, and
further the converter means includes a current source means for providing the supply current. -
7. Switching power apparatus of claim 1 wherein the first and second reference terminals are coupled to the capacitive means, and
further wherein the first and second supply terminals are coupled to each other. -
8. Switching power apparatus of claim 1 wherein the converter means includes at least one additional switching means separately coupled to one of first said switching means for selectively applying the respective corrective current to the supply terminal of the one switching means.
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9. Switching power apparatus of claim 8 wherein the additional switching means is coupled in series with the one switching means and includes an additional rectifying means for applying the respective corrective current to the supply terminal of the one switching means.
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10. Switching power apparatus of claim 8 wherein the additional switching means is coupled to the one switching means and includes a series coupled resistive means for limiting the respective corrective current.
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11. Switching power apparatus of claim 1 wherein the converter means includes:
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at least one additional inductive means each for attaining an additional corrective current and providing an additional return voltage;
at least one additional switching means coupled in series with one of the additional inductive means for selectively applying the respective additional corrective current between the power supply means and the capacitive means; and
at least one additional rectifying means separately coupled to one of the additional inductive means for applying the respective additional return voltage to at least one supply terminal.
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12. Switching power apparatus of claim 1 wherein the converter means includes:
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at least one additional capacitive means separately coupled to one of the switching means for applying the respective corrective current to the supply terminal of the one switching means; and
at least one additional rectifying means separately coupled to the one additional capacitive means for limiting a voltage appearing thereacross.
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13. Switching power apparatus of claim 12 wherein the converter means includes:
at least one additional inductive means separately coupled to one of the additional rectifying means for limiting a current applied thereto.
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14. Switching power apparatus of claim 1 further including a comparator means for comparing the AC input signal against the AC output voltage and providing a comparator signal,
wherein the first and second switching means, and the converter means are responsive to the comparator signal.
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15. Switching power apparatus providing an AC output voltage in response to an AC input signal comprising:
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a power supply means for providing at least one supply voltage;
a pair of inductive means each for attaining a corrective current and providing a return voltage;
a pair of rectifying means separately coupled to the inductive means for limiting the respective return voltages;
a capacitive means for providing the AC output voltage;
a pair of switching means separately coupled in series with the inductive means for selectively applying the respective corrective currents between the power supply means and the capacitive means;
an amplifier means for providing a fine current to the capacitive means in response to the AC input signal and the AC output voltage. - View Dependent Claims (16, 17, 18, 19, 20)
an additional inductive means for attaining the additional current and providing an additional return voltage;
an additional switching means coupled in series with the additional inductive means for selectively conducting the additional current; and
an additional rectifying means for limiting the additional return voltage.
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18. Switching power apparatus of claim 17 wherein the amplifier means includes at least one controllable current source means separately coupled between the power supply means and the capacitive means for providing an additional current that is at least a portion of the fine current.
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19. Switching power apparatus of claim 18 wherein the controllable current source means includes:
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an additional inductive means for attaining the additional current and providing an additional return voltage;
an additional switching means coupled in series with the additional inductive means for selectively conducting the additional current; and
an additional rectifying means for limiting the additional return voltage.
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20. Switching power apparatus of claim 15 further including a comparator means for comparing the AC input signal against the AC output voltage and providing a comparator signal,
wherein each switching means and the amplifier means are responsive to the comparator signal.
Specification