DC high voltage to DC low voltage converter

• US 20060262574A1
• Filed: 05/20/2005
• Published: 11/23/2006
• Est. Priority Date: 05/20/2005
• Status: Abandoned Application

• Current Assignee: Stonepath Power Systems Ltd.
• Original Assignee: Stonepath Power Systems Ltd.
• Inventors: Kelly, David
• Application Number:
  US11/133,189
• Publication Number:
  US 20060262574A1
• Time in Patent Office: Days
• US Class Current: 363/17
• CPC Class Codes: H02M 1/0074 Plural converter units whose inputs are connected in series
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer

Abstract

A high voltage DC to low voltage converter having a plurality of switches, connected in series, paired to form half bridges, inputs connected in series across a high voltage DC source, with outputs summed together using one or more primaries of one or more transformers, with one or more secondaries rectified and filtered to form an isolated DC output at a lower voltage. Each half bridge has an input voltage that is less than the overall input voltage.

Claims

1. A high voltage DC to low voltage converter comprising a plurality of switches adapted to connect in series to a high voltage DC source, the switches operated in pairs as half bridges, each half bridge coupled through a plurality of capacitors to a primary of a transformer having an isolated secondary, which is rectified and filtered into low voltage power.

2. The high voltage DC to low voltage converter as in claim 1, wherein the plurality of switches are paired, each pair of switches forming a half bridge and coupled through a capacitor to separate primaries of an isolation transformer with one or more secondaries rectified and filtered into a low voltage DC supply.

3. The high voltage DC to low voltage converter as in claim 1, wherein the plurality of switches are paired, coupled through a capacitor to one side of a primary of an isolation transformer, and the other side of the primary coupled to another half bridge switch pair which is operated in opposite phase to the half bridge on the opposite side of the primary, thus forming a full bridge, of which there are one or more each with separate primaries of an isolation transformer with one or more isolated secondaries rectified and filtered into a low voltage supply.

4. The high voltage DC to low voltage converter as in claim 1, where the plurality of switches are paired, each pair of switches forms a half bridge and is coupled through a capacitor to a common primary of a transformer which has one or more isolated secondaries rectified by diodes forming a rectified pulsing DC supply which is then filtered by an inductor and capacitor in to a low voltage DC supply which is substantially equal to the average of the pulsating DC input, and a control circuit that provides a feedback signal to a PWM MODULE that generates a pulse width modulated signal in relation to the feedback provided to a SWITCH DRIVER that turns the switches on and off with a time period governed by the PWM signal, and control electronics adapted to be powered by a START MODULE powered temporarily at starting by a start-up capacitor and after starting by an isolated secondary of the transformer.

5. The high voltage DC to low voltage converter as in claim 4, wherein the START MODULE is powered by an external DC power source.

6. The high voltage DC to low voltage converter as in claim 4, wherein the START MODULE is powered by an external AC power source.

7. The high voltage DC to low voltage converter as in claim 4, wherein the START MODULE is powered by an external DC power source provided by a low voltage, isolated, DC to DC half bridge.

8. The high voltage DC to low voltage converter as in claim 5, wherein the START MODULE is powered by an external DC power source provided by a low voltage, isolated, AC to DC half bridge.

9. The high voltage DC to low voltage converter as in claim 4, wherein each half bridge is coupled through a capacitor to separate primaries of an isolation transformer.

10. The high voltage DC to low voltage converter as in claim 4, where each half bridge is coupled through a capacitor to one side of a primary of an isolation transformer and the other side of the primary is coupled through a capacitor to another half bridge switch pair operated in opposite phase to the half bridge on the opposite side of the primary, all forming a full bridge, with one or more full bridges in series, operated with each coupled and appropriately phased to a common primary of an isolation transformer.

11. The high voltage DC to low voltage converter as in claim 1, wherein the SWITCH DRIVE may be turned OFF and ON by an external control signal.

12. The high voltage DC to low voltage converter as in claim 1, which operates from a common high voltage distribution bus and is enabled on demand to convert available high voltage DC to low voltage power to operate a low voltage device.

13. The high voltage DC to low voltage converter as in claim 1, adapted to operate a solid state RF amplifier to replace a high voltage vacuum RF amplifying device.

14. The high voltage DC to low voltage converter as in claim 1, adapted to operate an electric motor.

15. The high voltage DC to low voltage converter as in claim 14, wherein the electric motor is adapted to operate in a vehicle.

16. The high voltage DC to low voltage converter as in claim 1, adapted to convert the output of a high voltage battery to low voltage electricity upon demand.

17. The high voltage DC to low voltage converter as in claim 1, where the high voltage DC to low voltage converter is adapted to operate, on demand, a solid state laser module or subcomponents of a large solid state laser array.

18. The high voltage DC to low voltage converter as in claim 1, adapted to operate a solid state RF amplifier as a replacement for a high voltage vacuum tube-type RF amplifying device.

19. The high voltage DC to low voltage converter as in claim 1, adapted to operate an electric motor in a vehicle.

20. The high voltage DC to low voltage converter as in claim 1, adapted to convert the output of a high voltage battery to a low voltage power upon demand.

21. The high voltage DC to low voltage converter as in claim 4, wherein the SWITCH DRIVE is powered by the START MODULE.

22. The high voltage DC to low voltage converter as in claim 5, wherein the SWITCH DRIVE is powered by the START MODULE.

23. The high voltage DC to low voltage converter as in claim 6, wherein the SWITCH DRIVE is powered by the START MODULE.

24. The high voltage DC to low voltage converter as in claim 7, wherein the SWITCH DRIVE is powered by the START MODULE.

25. The high voltage DC to low voltage converter as in claim 8, wherein the SWITCH DRIVE is powered by the START MODULE.