Smart transfer switch devices, systems, and methods using double-base bipolar transistors
Methods and systems for smart transfer switch circuits and operation, and for operation of transfer and/or cutoff switches in combination with a power-packet-switching-architecture (PPSA) power converter. The transistors of the transfer and cutoff switches, and the transistors of the phase legs of the PPSA power converter if present, preferably all use double-base bipolar transistors which have low on-state series resistance as the switching elements.
1. A method for power conversion, comprising:
operating a power-packet-switching-architecture power converter which has, in each of multiple phase legs at both first and second ports, a plurality of four-terminal symmetrically bidirectional bipolar junction transistors, to provide power transfer between the first and second ports, with conversion of voltage, current, phase, and/or frequency as selected; and
using a first cutoff switch comprising multiple four-terminal symmetrically bidirectional bipolar junction transistors connected to selectably interrupt all connection to the power converter through the first port, and a second cutoff switch comprising multiple four-terminal symmetrically bidirectional bipolar junction transistors connected to selectably interrupt all connection to the power converter through the second port;
wherein the transistors of the phase legs of the first port are matched to, and are controlled synchronously with, the transistors of the first cutoff switch;
and wherein the transistors of the phase legs of the second port are matched to, and are controlled synchronously with, the transistors of the second cutoff switch.
2. The method of claim 1 , wherein the converter includes a link transformer, and wherein the first and second ports are connected to different sides of the link transformer, and wherein the transistors of the first cutoff switch are not matched to the transistors of the second cutoff switch.
3. The method of claim 1 , wherein the converter includes a single link inductor which is not a transformer, and wherein the transistors of the first cutoff switch are matched to the transistors of the second cutoff switch.
4. The method of claim 1 , wherein each port of the converter includes at least three distinct lines, which are separately connected through distinct transistors of the corresponding switch.