Multiple port power converter device

1. A power converter comprising:

at least two bi-directional power conversion circuit modules each having an AC port for AC input or output, a DC input or output and at least two DC ports;

each of said two bi-directional power conversion circuit modules comprising at least two switches for selectively connecting said DC input or output to one of said at least two DC ports;

a switch controller for controlling said switches of said power conversion circuit modules.

2. The power converter of claim 1 , wherein said at least two bi-directional power conversion circuit modules further comprise a DC to DC conversion circuit.

3. The power converter of claim 2 , wherein said DC to DC conversion circuit is a buck/boost DC to DC converter circuit.

4. The power converter of claim 1 , wherein said at least two DC ports are connected to at least two electric vehicle connections.

5. The power converter of claim 1 , wherein said at least two bi-directional power conversion circuits modules have a multilevel converter topology.

6. The power converter of claim 1 , wherein said at least two bi-directional power conversion circuit modules comprise:

an AC input connected to said AC port through said plurality of switches;

at least one high-voltage capacitor for storing power;

an inductor connected in series with said AC input,

a low-voltage capacitor,

two high-voltage switches connected between a first AC input terminal and opposed ends of said high-voltage capacitor,

two intermediate low-voltage power switches connected between said opposed end of said high-voltage capacitor and opposed ends of said low-voltage capacitor, and

two terminal low-voltage power switches connected between said opposed ends of said low-voltage capacitor and a second AC terminal,

wherein a DC load can be connected to said opposed ends of said high voltage capacitor;

a modulator receiving a reference signal from a converter controller;

a state selection circuit receiving said at least one comparison signal and outputting a state signal;

a switching pulse generator receiving said state signal and connected to gates of said power switches.

7. The power converter of claim 6 , wherein said inductor is connected in series with said AC input, said low-voltage capacitor, said two high-voltage power switches connected between said first AC terminal of said AC port and opposed ends of said high-voltage capacitor, said two intermediate low-voltage power switches connected between said opposed end of said high-voltage capacitor and opposed ends of said low-voltage capacitor, and said two terminal low-voltage power switches connected between said opposed ends of said low-voltage capacitor and said second AC terminal of said AC port;

wherein each of said plurality of DC ports be connected to said opposed ends of said high-voltage capacitor; and

wherein said controller works in an inverter mode to generate and apply to said two high-voltage power switches, said two intermediate low-voltage power switches and said two terminal low-voltage power switches signal waveforms comprising a first control signal for causing said low-voltage capacitor to be series connected with said DC port and said AC port and charged to a predetermined value proportional to a Voltage of said DC port, and a second control signal for causing said low-voltage capacitor to be disconnected from the DC port and series connected with the AC port, thereby causing the low-voltage capacitor to be discharged.

8. The power converter of claim 1 , further comprising an interface for communicating with said switch controller.

9. The power converter of claim 1 , wherein said switch controller is integrated in a main controller.

10. The apparatus of claim 1 , wherein the switch controller is selectively operable to:

connect the AC port to any of said at least two DC ports via one of said at least two bi-directional power conversion circuit modules;

connect the AC port to any of said at least two DC ports via two or more of said at least two bi-directional power conversion circuits modules connected to each other by said at least two switches; and

connect one of said at least two DC ports to the AC port via one of said at least two bi-directional power conversion circuits modules, and the AC port to another of at least two DC ports via another of said at least two bi-directional power conversion circuit modules.

11. A power converter comprising:

a plurality of on-board DC ports for receiving and delivering DC current at variable voltages;

a plurality of switches receiving current from a first port of said plurality of DC ports and delivering to at least a second port of said plurality of DC ports;

at least one power conversion circuit connecting to said plurality of switches to receive current from said first port and said second port;

at least one on-board AC port connecting to said at least one power conversion circuit for receiving and delivering AC current; and

a switch controller for controlling said plurality of switches wherein said switch controller determines a first-selected group and a second selected group of switches,

wherein said at least one conversion circuit is at least two power conversion circuits and wherein said plurality of switches are located on different power conversion circuits.

12. The power converter of claim 11 , wherein said plurality of on-board DC ports comprises a solar panel connection for receiving DC current from a solar panel.

13. The power converter of claim 11 , further comprising a connector backplane having plurality of module connectors, and wherein said at least one power conversion circuit is a conversion module connecting to said module connectors.

14. The power converter of claim 11 , wherein said at least one power conversion circuit further comprises at least one off-board component.

15. The power converter of claim 14 , wherein said at least one off-board components connects to said at least one power conversion circuit by said connector backplane.