Constant Current Source

• US 20140177304A1
• Filed: 12/24/2013
• Published: 06/26/2014
• Est. Priority Date: 12/24/2012
• Status: Abandoned Application

• Current Assignee: Laurence P. Sadwick
• Original Assignee: Laurence P. Sadwick
• Inventors: Sadwick, Laurence P.
• Application Number:
  US14/140,453
• Publication Number:
  US 20140177304A1
• Time in Patent Office: Days
• US Class Current: 363/126
• CPC Class Codes: H02M 1/14 Arrangements for reducing ripples from dc input or output
• CPC Class Codes: H02M 7/05 Capacitor coupled rectifiers
• CPC Class Codes: H02M 7/06 using discharge tubes without control electrode or semiconductor devices without control electrode

Abstract

A constant current source includes an alternating current input, a pair of capacitors connected in parallel with a load output, a pair of diodes connected in parallel with the pair of capacitors, wherein a first lead of the alternating current input is connected between the pair of diodes and a second lead of the alternating current input is connected between the pair of capacitors, and wherein capacitances of the pair of capacitors are selected to produce a substantially constant current to the load output at a voltage lower than that of the alternating current input.

Claims

1. An apparatus for providing constant current comprises:

an alternating current input;

a pair of capacitors connected in parallel with a load output; and

a pair of diodes connected in parallel with the pair of capacitors, wherein a first lead of the alternating current input is connected between the pair of diodes and a second lead of the alternating current input is connected between the pair of capacitors, and wherein capacitances of the pair of capacitors are selected to produce a substantially constant current to the load output at a voltage lower than that of the alternating current input.