POWER CONVERSION SYSTEM

• US 3,614,581 A
• Filed: 02/10/1970
• Issued: 10/19/1971
• Est. Priority Date: 02/10/1970
• Status: Expired due to Term

• Current Assignee: Emerson L. Frost
• Original Assignee: Emerson L. Frost
• Inventors: Frost, Emerson L.
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Gunther, John M.
• Application Number:
  US05/010,166
• Time in Patent Office: 616 Days
• Field of Search: 320/39,DIG.2,40,21,1 321/2,49 323/83 307/72-74,81,85,149
• US Class Current: 320/140
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y10S 320/23 Capacitor
• CPC Class Codes: Y10S 320/24 Inductor

Abstract

This invention relates to a power conversion system wherein energy from a high-voltage direct current source is caused to charge a relatively small high-voltage capacitor and the energy stored in said capacitor is transferred periodically through a resonant discharge circuit and rectifier to supply a low-voltage direct current to a load which may, for example, be a large capacitor or a battery whose charge is to be maintained relatively constant.

Claims

1. An energy conversion system comprising a high-voltage direct current source, a charging capacitor, switching means including means for connecting said charging capacitor to said source to charge said capacitor from said source during a first interval;

and a series resonant discharge circuit including said charging capacitor, an inductor, a rectifier, and a load;

said switching means further including means for discharging said charging capacitor through said resonant discharge circuit during a second interval.

2. An energy conversion means according to claim 1 wherein said load is a battery.

3. An energy conversion means according to claim 1 wherein said load is a second capacitor the capacitance of which is large compared to the capacitance of said charging capacitor.

4. An energy conversion system according to claim 1 further including a charging impedance combining with said charging capacitor to comprise a resonant charging circuit.

5. An energy conversion system according to claim 1 wherein said switching means is cycled to periodically charge said charging capacitor and transfer the energy stored in said charging capacitor to said load.