DC-AC Soft-Switching Inverter

This invention has been selected as one of 25 national semifinalists in the 2007 History Channel/Modern Marvels Invent Now Challenge

US Patent # 7157884

New power control circuit and topology for charging or discharging high-capacitance capacitors to and from very high voltages, respectively.

Can be used for regenerative braking devices and load-leveling in an HEV, EV, PHEV, or fuel-cell cars. It is the simplest and probably the only control circuit that can effectively control EEStor's ESU (or any other high voltage capacitive energy storage device) so it can be used commercially without causing deadly injury.

The unique, patented placement of an inductive load device (transformer primary) in series with a control capacitor gives circuits using this topology both zero-current and zero-voltage switching characteristics to ease the electrical burden on the switches.  On a more interesting note, this circuitry provides a solution to the classical "two capacitor dilemma" where half the energy is mysteriously lost when charging one capacitor from another.  That means if this circuit topology and technology is not used as a DC-AC inverter or a DC-AC-DC converter, then half the stored energy will be wasted and will never reach the load device.  Any load device connected in series with a control capacitor if used in any type of electronic inversion or conversion device will infringe on this patent, and such circuitry is desperately needed now and in the future for high-voltage mobile and fixed electrical applications.  Also, all aspects of power control and conditioning for high-voltage direct current transmission lines can be accomplished with this circuitry.  HVDC transmission lines are an absolute necessity for future renewable-energy distributed-power generation systems (mini-grids) for wind, wave, and photovoltaic power scavenging.

SUMMARY

The present invention provides a method and circuit for transferring electric energy to a high voltage electric energy storage device such as a capacitor or other novel high voltage, high energy density electric energy storage device of the future from a high-voltage electric power source in a safe, effective, and efficient manner. It is also the object of the present invention to provide a method and circuit for transferring electric energy from an energized high voltage electric energy storage device such as a capacitor or other novel high voltage, high energy density electric energy storage device of the future to an electrical load device.

Objects and Advantages

Accordingly, besides the objects and advantages of the method and circuit for energizing and de-energizing an electric energy storage device to and from high voltages respectively, as described above, several other objects and advantages of the present invention are: (a) to provide a safe method and circuit for retrieving stored electrical energy from an electrical energy storage device that has been energized to many thousands of volts dc by preventing excessive and destructive electric current from flowing at any time; (b) to provide a safe method and circuit for supplying electrical energy to an electrical energy storage device that will be energized to many thousands of volts dc by preventing excessive and destructive electric current from flowing at any time; (c) to provide a more effective method and circuit for retrieving stored electrical energy from an electrical energy storage device that has been energized to many thousands of volts dc by eliminating the use of, and need for, bulky and expensive gas-filled tubes or other unreasonably large electrical components; (d) to provide a more effective method and circuit for supplying electrical energy to an electrical energy storage device that will be energized to many thousands of volts dc by eliminating the use of, and need for, bulky and expensive gas-filled tubes or other unreasonably large electronic components; (e) to provide an efficient method and circuit for retrieving electrical energy from an electrical energy storage device that will be energized to many thousands of volts dc by transferring with relatively few losses, a large percentage of electrical energy to the electrical load device where useful work can be performed. (f) to provide an efficient method and circuit for supplying electrical energy to an electrical energy storage device that will be energized to many thousands of volts dc by transferring with relatively few losses, a large percentage of electrical energy supplied by the electric power source;

For more information about licensing or manufacturing this product please contact:

FIG. 1 shows a schematic view of a circuit comprised of blocks of electrical components that work together to execute the method identified as one aspect of the present invention:

Fig. 1

Name: Jim Hacsi
Phone: (719) 561-4138
Email: jjhasi@comcast.net