Hybrid bridge transfer switch system and methods

A computer-implemented method for operating a transfer switch including a first switch and a second switch, the method comprising:

• determining, by a controller, an abnormal condition at a first power source in electrical connection with the transfer switch;
• sending, by the controller and based on a first logic, a first set of gate signals to the first switch to open at least one first SSSD pair in response to detecting the abnormal condition at the first power source;
• and
• following a time delay, sending, by the controller and based on a second logic, a second set of gate signals to the second switch to close at least one second SSSD pair and to connect a load to a second power source,
• wherein the at least one first SSSD pair comprises a different type of switching devices relative to the at least one second SSSD pair.

A system comprising:

• a first power source;
• a second power source;
• an electrical load;
• a transfer switch comprising:
• a first switch comprising a plurality of first SSSD pairs connected in parallel between the first power source and the electrical load, and
• a second switch comprising a plurality of second SSSD pairs connected in parallel between the second power source and the electrical load,
• wherein the plurality of first SSSD pairs comprises different type of switching devices relative to the plurality of second SSSD pairs;
• and
• a controller comprising:
• a processor, and
• a non-transitory computer readable medium having stored thereon instructions executable by the processor to enable the controller to perform operations comprising:
• determine an abnormal condition at the first power source in
• electrical connection with the transfer switch,
• send a first set of gate signals to the plurality of first SSSD pairs to open the first switch in response to detecting an abnormal condition at the first power source, and
• after a time delay, sending a second set of gate signals to the plurality of second SSSD pairs to close the second switch and to connect the electrical load to the second power source.