Flyback type power supply

A power supply circuit for charging a capacitive element in response to a source of current comprising:

• first switching means coupled to said source of current,
• inductive means coupled to said first switching means,
• capacitive means coupled between said inductive means and said source of current, said inductive means and said capacitive means forming a first resonant circuit with said capacitive means for storing current passed through said first switching means,
• transformer means having first and second winding with said first winding coupled to said capacitive means, and said second winding coupled to said capacitive element to provide a current path thereto, said first winding and said capacitive means forming a second resonant circuit,
• second switching means coupled between said first winding and said capacitive means for passing current from said capacitive means, said transformer means storing as magnetic current said current passed through said second switching means, and
• rectifier means coupled in the current path of said second winding.

A power supply circuit for charging a capacitive element comprising:

• a source of current,
• first switching means coupled to said source,
• a first resonant circuit coupled to said switching means and including capacitive means,
• a second circuit coupled to said capacitive means, said second circuit including a first transformer winding and being resonant with said capacitive means,
• second switching means coupled in said second circuit for switching the current from said capacitive means to said first transformer winding and for being substantially biased out of conduction in response to the substantial discharge of said capacitive means,
• a second transformer winding coupled to said first transformer winding, and
• third switching means coupled between said second winding and said capacitive element for passing the current from said first transformer winding to said capacitive element when said first and second switching means are substantially nonconductive.

A circuit for charging a capacitive element from a power source having first and second terminals comprising:

• first switching means having an input and an output terminal with said input terminal coupled to the first terminal of said power source,
• inductive means having first and second terminals with the first terminal coupled to the output terminal of said first switching means,
• capacitive means having first and second terminals respectively coupled between the second terminal of said inductive means and the second terminal of said power source, said inductive means and said capacitive means forming a first resonant circuit,
• a transformer having first and second windings, said first winding having first and second terminals with the first terminal coupled to the first terminal of said capacitive means, said first winding and said capacitive means forming a second resonant circuit,
• second switching means having an input and output terminal respectively coupled between the second terminal of said first winding and the second terminal of said capacitive means, and
• rectifying means coupled between said second winding and said capacitive element.

A circuit for charging a capacitive network from a power source having first and second terminals comprising:

• first switching means having an input and an output terminal with said input terminal coupled to the first terminal of said power source,
• an inductor having first and second terminals with the first terminal coupled to the output terminal of said first switching means,
• first capacitive means having first and second terminals respectively coupled between the second terminal of said inductive means and the second terminal of said power source,
• a plurality of second capacitive means coupled in series between the second terminal of said inductive means and the second terminal of said power source,
• a transformer having a plurality of first winding means and second winding means, said first winding means including first and second end winding means,
• a plurality of second switching means with one coupled between each two adjacent series coupled first winding means, one coupled between said first end winding means and said second terminal of said power source, and with a coupling between a selected terminal of a selected first winding means and said plurality of second capacitive means, and
• rectifying means coupled between said second winding means and said capacitive network.

A power supply circuit for charging a capacitive element comprising:

• a source of current,
• a first resonant circuit coupled to said source and including first switching means and capacitive means,
• a second resonant circuit including a first transformer winding and second switching means with said first transformer winding coupled to said capacitive means and said second switching means coupled between said first transformer winding and said source of current,
• a second transformer winding coupled to said first transformer winding and being formed of segments, and
• rectifying means coupled between said segments, and between a first end segment and said capacitive element.