US 6,639,815 B1Granted

Precision switching power amplifier comprising instantaneously interruptible power source

OwnerJeff Gucyskiinventor

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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.

Claims20

Dependent claims

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.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/139,691Filed 4 May 2002
Published: US 2003/0206422 A16 Nov 2003
Granted: 28 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02M 1/34
Means for protecting converters other than automatic disconnection: snubber circuits
H02M 1/088
Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters: for the…
H02M 7/537
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only, e.g. single…
H03F 3/2173
Class D power amplifiers; Switching amplifiers: of the bridge type