Patent ID: 11951855
Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO ELEAPPOWER LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 8:
9. The circuit of claim 4, wherein each phase of the CSC is associated with two switches, an upper switch corresponding to the phase and a lower switch corresponding to the phase, each of the upper switch and the lower switch corresponding to the phase comprising a first and a second series connected sub-switches with an accessible mid-point, the first sub-switch providing positive voltage blocking capability and the second sub-switch providing negative voltage blocking capability; wherein, the polarity inversion circuit includes a first three phase switch network and a second three phase switch network, with each three phase switch network including at least four switches, three switches for each phase and one master switch that is to controllable; wherein the positive CSC DC terminal and the positive VSC1 DC terminal are electrically bonded, and the negative CSC DC terminal and the negative VSC2 DC terminal are electrically bonded; and
wherein the first three phase switch network couples a mid-point of three upper sub-switches to the dual inverter drive system;
wherein the second three phase switch network couples a mid-point of three lower sub-switches to the dual inverter drive system;
wherein the polarity inversion circuit has a first state and a second state: in the first state, the first and second master control switches are controlled to be off and the first and second phase switch network are not active; in the second state, the first and second master control switches are controlled to be on and the first and second phase switch network are active;
wherein in the first state, power is directed to the vehicle; and
wherein in the second state, power is directed to the AC grid.