High power factor ac to dc converter circuit

Claim 2

A high power factor AC to DC converter circuit comprising: a load circuit; switching regulator means for providing a DC potential, said switching regulator means including an oscillator circuit coupled to a control circuit with said oscillator circuit having an output circuit with a series connected inductor and capacitor, said capacitor coupled to said load circuit and said inductor coupled to a DC restorer connected to said oscillator circuit; rectifier means for providing a full-wave rectified pulsating DC potential coupled to said switching regulator means; a source of AC potential coupled to said rectifier means; and a radio frequency current filter means connected in circuit with said rectifier means and switching regulator means, said filter means including a radio frequency responsive capacitor shunting said rectifier means a pulsating current flow in phase with and of at least 50% duration of said potential available from said AC potential source a power factor of at least 90%.

Claim 3

The high power factor AC to DC converter circuit of claim 1 wherein said switching regulator means includes an oscillator circuit coupled to a control circuit.

Claim 4

The high power factor AC to DC converter circuit of claim 1 wherein said radio frequency current filter includes a capacitor shunting said rectifier means and coupled to said switching regulator means and an inductor coupling said rectifier means to said source of AC potential.

Claim 5

The high power factor AC to DC converter circuit of claim 1 wherein said switching regulator means includes an oscillator circuit coupled to a control circuit having fast turn on and fast turn off networks coupled to said oscillator circuit.

Claim 6

The high power factor AC to DC converter circuit of claim 1 wherein said radio frequency current filter means has a 3db attenuation point at a frequency greater than the frequency of said full-wave rectified pulsating DC potential and less than the switching frequency of said switching regulator means.

Claim 7

The high power factor AC to DC converter circuit of claim 1 wherein said switching regulator means includes a switching electron device and a positive feedback network coupled thereto for effecting rapid turn-on or conduction.

Claim 8

An AC to DC converter circuit with a high power factor comprising: means for providing an AC potential; means coupled to said means for providing an AC potential for providing a rectified full-wave pulsating DC potential; means coupled to said means for providing a rectified full-wave pulsating DC potential for providing a DC potential, said means effecting a radio frequency pulsating current flow therein and including a switching regulator having a switching electron device coupled to an output circuit including a series connected inductor and capacitor and to a control circuit means, said control circuit means having a DC restorer circuit means coupled to said inductor of said output circuit and to said switching electron device to provide a substantially constant DC potential to said switching electron device; and means connected in circuit with said means for providing a rectified full-wave pulsating DC potential and said means for providing a DC potential said means including a radio frequency capacitor shunting said means for providing a rectified full-wave pulsating DC potential whereby a pulsating DC current in phase with and of at least 50% duration of said potential available from said AC potential causes said means for providing an AC potential to have a power factor of about 90%.

Claim 9

An AC to DC converter circuit with a high power factor comprising: means for providing an AC potential; means coupled to said means for providing an AC potential for providing a rectified full-wave pulsating DC potential; means coupled to said means for providing a rectified full-wave pulsating DC potential for providing a DC potential, said means effecting a radio frequency pulsating current flow therein and including a switching regulator having a switching electron device coupled to an output circuit including a series connected inductor and capacitor and to a control circuit means, said control circuit means having a DC restorer circuit means coupled to said inductor of said output circuit and to said switching electron device to provide a substantially constant DC potential to said switching electron device; and means connected in circuit with said means for providing a rectified full-wave pulsating DC potential and said means for providing a DC potential said means including a radio frequency capacitor shunting said means for providing a rectified full-wave pulsating DC potential whereby a pulsating DC current in phase with and of at least 50% duration of said potential available from said AC potential causes said means for providing an AC potential to have a power factor of about 90%.