Universal input/output power supply with inherent near unity power factor
First Claim
1. A power converter for receiving a DC input and providing a variable AC output, said converter comprising:
- an input terminal and a return terminal for receiving said DC input;
an input inductor, an input capacitor, and a transformer having a primary and a secondary winding, said input inductor, said input capacitor, and said primary winding connected in series between said input terminal and said return terminal;
a controllable switch having a control terminal for receiving a control signal to open and close said switch at predetermined intervals, said switch connecting the junction of said input inductor and input capacitor with said return terminal; and
an output circuit comprising an output inductor, an output capacitor, and said secondary winding connected in series;
such that when said controllable switch is opened and closed at said predetermined intervals said capacitor is alternatively charged by said DC input and then discharged across said primary winding, which transfers the energy of said discharge to said secondary winding, and the inductors, capacitors, and transformer having parameters selected whereby a waveform of predetermined wave shape, amplitude, frequency, phase, and damping factor is created in said output circuit.
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Abstract
An electronic method and apparatus are described for an isolated, universal input, power supply in the form of a single-ended resonant converter that utilizes capacitive energy storage versus magnetic energy storage, for converting an ac or DC input voltage to a variable voltage and current DC output or a variable ac output voltage, current, frequency, or phase. The preferred topology is a direct ac to ac, single-ended resonant converter using a single switch (4) and integrated magnetic element (1) with inherent near-unity power factor. Advantages of this method include a significant reduction in global energy consumption, simpler circuitry, substantially lower cost, higher efficiency, and longer operational life.
54 Citations
31 Claims
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1. A power converter for receiving a DC input and providing a variable AC output, said converter comprising:
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an input terminal and a return terminal for receiving said DC input;
an input inductor, an input capacitor, and a transformer having a primary and a secondary winding, said input inductor, said input capacitor, and said primary winding connected in series between said input terminal and said return terminal;
a controllable switch having a control terminal for receiving a control signal to open and close said switch at predetermined intervals, said switch connecting the junction of said input inductor and input capacitor with said return terminal; and
an output circuit comprising an output inductor, an output capacitor, and said secondary winding connected in series;
such that when said controllable switch is opened and closed at said predetermined intervals said capacitor is alternatively charged by said DC input and then discharged across said primary winding, which transfers the energy of said discharge to said secondary winding, and the inductors, capacitors, and transformer having parameters selected whereby a waveform of predetermined wave shape, amplitude, frequency, phase, and damping factor is created in said output circuit. - View Dependent Claims (2, 3)
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4. A power converter for receiving an AC or DC input and providing a variable AC output, said converter comprising:
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a first input terminal and a second input terminal for receiving said input;
an input inductor, an input capacitor, and a first output inductor connected in series between said first input terminal and second input terminal with said input capacitor between said input inductor and said output inductor;
a controllable switch having a control terminal for receiving a control signal to open and close said switch at predetermined intervals;
a rectifier connecting the junction of said input inductor and said input capacitor with said second input terminal, the controllable switch in series with the current path through said rectifier connected such that a rectified signal biased in accordance with the polarity of said switch is impressed across said switch; and
an output circuit comprising an output capacitor connected in parallel with said first output inductor;
such that when said controllable switch is opened and closed at said predetermined intervals said input capacitor is alternatively charged by said input and then discharged through said first output inductor, and the inductors and capacitors having parameters selected whereby a waveform of predetermined wave shape, amplitude, frequency, phase, and damping factor is created in said output circuit. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A power converter for receiving a DC input and providing a variable AC output, said converter comprising:
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an input terminal and a return terminal for receiving said DC input;
an input inductor, an input capacitor, and a first output inductor connected in series between said input terminal and said return terminal with said input capacitor between said input inductor and said output inductor;
a controllable switch having a control terminal for receiving a control signal to open and close said switch at predetermined intervals, said switch connecting the junction of said input inductor and input capacitor with said return terminal; and
an output circuit comprising an output capacitor connected in parallel with said first output inductor;
so that when said controllable switch is opened and closed at said predetermined intervals said input capacitor is alternatively charged by said DC input and then discharged through said first output inductor, the inductors and capacitors having parameters selected whereby a waveform of predetermined wave shape, amplitude, frequency, phase, and damping factor is created in said output circuit. - View Dependent Claims (12, 13)
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14. A power converter for receiving an AC or DC input and providing a variable AC output, said converter comprising:
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an input stage and an output stage;
said input stage comprising;
input means for receiving said input;
a capacitor for storing energy from said input;
a means for transferring energy from said input stage to said output stage;
means for creating a charge path across said capacitor, said charge path comprising current regulation means in series with said capacitor;
means for creating a discharge path for said capacitor, said discharge pathcomprising said energy transferring means in series with said capacitor;
means for controllably charging and discharging said capacitor;
said output stage comprising;
means for receiving energy from said energy transferring means;
resonant circuit means responsive to said energy for creating an AC emf; and
output means for expressing said AC emf. - View Dependent Claims (15)
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16. A power converter for receiving an AC or DC input and providing a variable AC output, said converter comprising:
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a first input terminal and a second input terminal for receiving said input;
an input inductor, an input capacitor, and a transformer having a primary and a secondary winding, said input inductor, said input capacitor, and said primary winding connected in series between said first input terminal and second input terminal with said input capacitor between said input inductor and said primary winding;
a controllable switch having a control terminal for receiving a control signal to open and close said switch at predetermined intervals;
a rectifier connecting the junction of said input inductor and said input capacitor with said second input terminal, the controllable switch in series with the current path through said rectifier connected such that a rectified signal biased in accordance with the polarity of said switch is impressed across said switch; and
an output circuit comprising an output inductor, an output capacitor, and said secondary winding connected in series;
such that when said controllable switch is opened and closed at said predetermined intervals said input capacitor is alternatively charged by said input and then discharged across said primary winding, which transfers the energy of said discharge to said secondary winding, and the inductors, capacitors, and transformer having parameters selected whereby a waveform of predetermined wave shape, amplitude, frequency, phase, and damping factor is created in said output circuit. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification