DC energy transfer apparatus, applications, components, and methods
View Patent ↗This discloses apparatus including, but not limited to, an all Direct Current (DC) energy transfer circuit, a energy transfer controller, an all-DC energy transfer network, components of use in such circuits, and application apparatus that benefits from including and/or using the all-DC energy transfer device and methods of operating the above in accord with this invention. The application apparatus may include, but are not limited to, a hybrid electric vehicle, an electric vehicle, and/or a solar power device, in particular, a hybrid electric/internal combustion engine automobile.
1. An apparatus, comprising an energy transfer device including
an input DC terminal receiving short time-window time-varying power energy, a common terminal, a service terminal, and an output DC terminal;
a first capacitive device, a second capacitive device, a switch and an inductive device;
a control terminal coupling the switch to an energy transfer controller controlling an open or closed state of the switch relative to the common terminal;
an all-DC energy transfer network coupled among the input DC terminal, the service terminal, and the common terminal, wherein at least one instance of the energy transfer device is adapted to contribute to an energy transfer between the input DC terminal and the service terminal, and wherein the input DC terminal includes a voltage of at least 36 volts, and an output DC voltage includes a voltage of at least twelve volts, the first capacitive devices includes a capacitance of at least 500 micro Farads with a working voltage of at least 800 volts, the second capacitive device includes a capacitance of at least 1500 micro Farads and is adapted for energy transfers between the input DC terminal and the output DC terminal of at least K % efficiency of energy transfer, wherein K is at least 65.
2. The apparatus of claim 1 , wherein a power spectrum of the short time window is concentrated in the DC or near 0 frequency component.
3. The apparatus of claim 2 , wherein the short time window may have a duration in a range of at least several minutes down to 16 ms.
4. The apparatus of claim 1 , wherein the switch comprises a switching circuit, and further comprising:
a plurality of step down stages, each step down stage having a connection to the input DC terminal, the output DC terminal, the control terminal, and the common terminal, and each step down stage having an additional inductor, and additional capacitive device, and an additional switch of the switching circuit, wherein the additional switch of a respective step down stage allows a respective capacitive device to be charged with or separately from the first capacitive device and second capacitive device; and
a shared inductor coupled between an output of the plurality of step down stages and the output DC terminal.
5. The apparatus of claim 4 , wherein the inductive device includes a cooling layer comprising a liquid dielectric suitable for use in high energy transfer applications.
6. The apparatus of claim 5 , wherein the switch is closed by the energy transfer controller when the first capacitor reaches its charged threshold.
7. The apparatus of claim 1 , wherein at least one instance of the energy transfer device is adapted to contribute to an energy transfer between the input DC terminal and the service terminal of at least one million Joules.
8. The apparatus of claim 7 , wherein the energy transfer between the input DC terminal and the service terminal is at least two million Joules.
9. The apparatus of claim 1 , wherein the device is an all-DC energy transfer device and the output terminal is coupled to one or more all-DC step down stages, each step down stage comprising an additional switch, an additional inductor, and an additional capacitor, and further wherein an open or closed state of both the switch and additional switch control charging and discharging of both the second and additional capacitor.
10. The apparatus of claim 1 , wherein the input terminal is coupled to a generator that provides electrical output to the device, the output terminal is coupled to an electric motor to power a mechanical drive system.