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US 5,668,715 AGranted
Multiple output, zero voltage switching, series resonant VHF inverter
AssigneeHughes Electronics Corporation
InventorsWilbur E. Hong, David M. Lusher, William B. Hwang
Life of this patent
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Abstract
VHF DC to AC inverters which include switching circuitry (13, 115, 125) and multiple resonant waveshaping networks (C11, L11, C12; C21, L21, C22; C111, L111; C221, L221; C331, L331; C441, L441) connected between the switching circuitry and respective load circuits (33, 43, 133, 143).
Claims10
A VHF DC to AC inverter comprising:
- switching means connected between a supply voltage and a reference voltage, wherein said switching means includes a transistor having a first terminal and a second terminal, and an inductor connected between said first terminal and the supply voltage;
- a first resonant waveshaping network responsive to said switching means, wherein said first resonant circuit includes a first resonant circuit first capacitor connected between said first terminal and said second terminal, and a first resonant circuit inductor and a first resonant circuit second capacitor connected to said first terminal;
- a first load circuit responsive to said resonant waveshaping network;
- a second resonant waveshaping network responsive to said switching means, wherein said second resonant circuit includes a second resonant circuit first capacitor connected between said first terminal and said second terminal, and a second resonant circuit inductor and a second resonant circuit second capacitor connected to said first terminal;
- and
- a second load circuit responsive to said second resonant waveshaping network.
3 more elements
A DC to AC inverter comprising:
- a first resonant waveshaping network comprised of a first capacitor and a first inductor connected in series between a first supply voltage node and a first central node, said first supply voltage node being at a positive voltage relative to ground;
- a second resonant waveshaping network comprised of a second capacitor and a second inductor connected in series between the first supply voltage node and a second central node;
- first switching means connected across said first capacitor and said second capacitor, said first switching means being driven with a first periodic drive signal of a predetermined frequency;
- a third resonant waveshaping network comprised of a third capacitor and a third inductor connected in series between a second supply voltage node and the first central node, said second supply voltage node being at a voltage that is less than said positive voltage;
- a fourth resonant waveshaping network comprised of a fourth capacitor and a fourth inductor connected in series between the second supply voltage node and the second central node, said second supply voltage node being at a voltage that is less than said positive voltage;
- second switching means connected across said third and fourth capacitors, said second switching means being driven with a second periodic signal of said predetermined frequency and being out of phase by 180 degrees relative to said first periodic drive signal;
- a first bandpass filter connected to said first central node and responsive to said first resonant waveshaping network and said third resonant waveshaping network;
- a first load circuit responsive to said first bandpass circuit;
- a second bandpass filter connected to said second central node and responsive to said second resonant waveshaping network and said fourth resonant waveshaping network;
- and
- a second load circuit responsive to said second bandpass filter.
8 more elements
Dependencies are inferred from the claim text.