초록 ▼

An automatic transfer switch for a power system receiving multiple alternating current sources and delivering multiple alternating current output is described. A transfer switch control circuit can sense a power loss in one or both AC sources. Each power supply can deliver current to drive a load bu

An automatic transfer switch for a power system receiving multiple alternating current sources and delivering multiple alternating current output is described. A transfer switch control circuit can sense a power loss in one or both AC sources. Each power supply can deliver current to drive a load but, if one of the power supplies fails, the other can supply power to drive both loads.

대표청구항 ▼

1. A transfer switch with arc suppression circuitry, the transfer switch comprising: at least one microprocessor;a first solid state switch and a first relay in parallel, wherein the at least one microprocessor is in switch control communication with the first solid state switch and the first relay,

1. A transfer switch with arc suppression circuitry, the transfer switch comprising: at least one microprocessor;a first solid state switch and a first relay in parallel, wherein the at least one microprocessor is in switch control communication with the first solid state switch and the first relay, and wherein the first solid state switch and the first relay are connectable to a first outlet;a first power source input connectable to a first power source, the first power source input in power supply communication with the first solid state switch and the first relay;a second solid state switch and a second relay in parallel, wherein the at least one microprocessor is in switch control communication with the second solid state switch and the second relay, and wherein the second solid state switch and the second relay are connectable to the first outlet;a second power source input connectable to a second power source, the second power source input in power supply communication with the second solid state switch and the second relay; anda non-transitory memory having instructions stored thereon that when executed by the at least one microprocessor cause the at least one microprocessor, upon detection of an interruption in the first power source to the first power source input resulting in a disruption of power to the first outlet, to switch the first outlet over to the second power source input that was not previously supplying power to the first outlet by: activating the first solid state switch to shunt current around the first relay while opening the first relay;activating the second solid state switch while closing the second relay to supply power from the second power source to the first outlet through the second solid state switch; anddeactivating the first and second solid state switches so that the second relay channels power to the first outlet. 2. The transfer switch of claim 1, wherein the first and second solid state switches are triacs. 3. The transfer switch of claim 1, further comprising: a third solid state switch and a third relay in parallel, wherein the at least one microprocessor is in switch control communication with the third solid state switch and the third relay, and wherein the third solid state switch and the third relay are connectable to a second outlet;a fourth solid state switch and a fourth relay in parallel, wherein the at least one microprocessor is in switch control communication with the fourth solid state switch and the fourth relay, and wherein the fourth solid state switch and the fourth relay are connectable to the second outlet. 4. The transfer switch of claim 3, wherein the third and fourth solid state switches are triacs. 5. A transfer switch with arc suppression circuitry, the transfer switch comprising: a first power source input configured to receive power from a first power source;a second power source input configured to receive power from a second power source;a first relay;a second relay;a first solid state switch in parallel with the first relay, wherein the first relay is electrically connected to the first power source input and initially, when in a first position, is operative to direct power from the first power source input to one or more outlets;a second solid state switch in parallel with the second relay, wherein the second relay is electrically coupled with the second power input and the one or more outlets;means for automatically monitoring for interruptions in the first power source; andat least one microprocessor programmed to control the first and second solid state switches and the first and second relays, wherein in response to an interruption of power from the first power source to the first power source input, the at least one microprocessor is further programmed to: cause the first solid state switch to energize;cause the first relay to switch from the first position to a second position; andcause the second solid state switch to energize, thereby allowing the second solid state switch to provide the power received by the second power input to the one or more outlets. 6. The transfer switch of claim 5, further comprising a first electrical load initially configured to receive power from the first power source through one of the first solid state switch and the first relay. 7. The transfer switch of claim 1, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the first relay is opened before deactivating the first solid state switch. 8. The arc suppression circuit of claim 7, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the second relay is closed before deactivating the second solid state switch. 9. The transfer switch of claim 1, wherein the first power source and the second power source are two different phases of a three phase power source. 10. A power distribution unit comprising: a housing;a first power input and a second power input each penetrating the housing;a plurality of power outlets disposed on a surface of the housing; andcircuitry enclosed in the housing interconnecting the first power input and the second power input with the plurality of power outlets, wherein the circuitry includes a transfer switch having an arc suppression circuit, the transfer switch comprising: at least one processing device;a first solid state switch and a first relay in parallel, wherein the at least one processing device is communicably coupled with the first solid state switch and the first relay, and wherein the first solid state switch and the first relay are connectable to the plurality of power outlets;a first power source input connectable to the first power input, the first power source input in power supply communication with the first solid state switch and the first relay;a second solid state switch and a second relay in parallel, wherein the at least one processing device is communicably coupled with the second solid state switch and the second relay, and wherein the second solid state switch and the second relay are connectable to the plurality of power outlets;a second power source input connectable to the second power input, the second power source input in power supply communication with the second solid state switch and the second relay; anda non-transitory memory having instructions stored thereon that when executed by the at least one processing device cause the at least one processing device, upon detection of an interruption in power supplied through the first power input, to: temporarily activate the first solid state switch to shunt current around the first relay while opening the first relay;temporarily activate the second solid state switch while closing the second relay to supply power from a second power source through the second power input; anddeactivate the first and second solid state switches so that the second power source is providing power through the second relay to the plurality of power outlets. 11. The power distribution unit of claim 10, further comprising a communication port to communicate information to, or receive information from, other devices. 12. The power distribution unit of claim 10, wherein the first and second solid state switches are triacs. 13. The power distribution unit of claim 10, further comprising at least one selection device allowing a user to select a nominal voltage range for an operating voltage of the first power input and the second power input. 14. The power distribution unit of claim 10, further comprising one or more displays located on the housing. 15. The power distribution unit of claim 10, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one processing device further cause the at least one processing device to confirm that the first relay is opened before deactivating the first solid state switch. 16. The power distribution unit of claim 15, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one processing device further cause the at least one processing device to confirm that the second relay is closed before deactivating the second solid state switch. 17. The power distribution unit of claim 10, wherein the first power source and the second power source are two different phases of a three phase power source. 18. A method to transfer one or more electrical loads between two sources of power using a transfer switch having a first solid state switch and a first relay in parallel, a first source of power, a second solid state switch and a second relay in parallel, and a second source of power, the method comprising: receiving an indication of an interruption in power supplied by the first source of power;temporarily activating, upon receiving the indication of the interruption in power supplied by the first source of power, the first solid state switch to shunt current around the first relay while opening the first relay;temporarily activating the second solid state switch while closing the second relay to provide power from the second source of power; anddeactivating the first and second solid state switches so that the second source of power is providing power to one or more electrical loads attached to one or more power outlets. 19. The method of claim 18, wherein there is a minimum delay before deactivating the first solid state switch. 20. The method of claim 19, wherein the minimum delay is less than eight milliseconds. 21. The method of claim 18, further comprising confirming that the first relay is opened before deactivating the first solid state switch. 22. The method of claim 18, further comprising confirming that the second relay is closed before deactivating the second solid state switch. 23. The method of claim 18, wherein the interruption in power supplied by the first power source is a loss of power. 24. The method of claim 23, further comprising confirming that the first relay is opened before deactivating the first solid state switch. 25. The method of claim 24, further comprising confirming that the second relay is closed before deactivating the second solid state switch. 26. The method of claim 18, wherein the first power source and the second power source are two different phases of a three phase power source. 27. A transfer switch with arc suppression circuitry, comprising: at least one microprocessor;a first solid state switch and a first relay in parallel, wherein the at least one microprocessor is in switch control communication with the first solid state switch and the first relay, and wherein the first solid state switch and the first relay are connectable to an outlet;a first power source input connectable to a first power source, the first power source input in power supply communication with the first solid state switch and the first relay;a second solid state switch and a second relay in parallel, wherein the at least one microprocessor is in switch control communication with the second solid state switch and the second relay, and wherein the second solid state switch and the second relay are connectable to the outlet;a second power source input connectable to a second power source, the second power source input in power supply communication with the second solid state switch and the second relay; anda non-transitory memory having instructions stored thereon that when executed by the at least one microprocessor cause the at least one microprocessor, upon detection of an interruption in the first power source, to, in order: i. activate the first solid state switch to shunt current around the first relay;ii. open the first relay;iii. deactivate the first solid state switch after the first relay is opened;iv. activate the second solid state switch;v. close the second relay; andvi. deactivate the second solid state switch after the second relay is closed so that the second relay channels power to the outlet. 28. The transfer switch of claim 27, wherein the first and second solid state switches are triacs. 29. The transfer switch of claim 27, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the first relay is opened before deactivating the first solid state switch. 30. The transfer switch of claim 29, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that voltage from the second power source is available at the outlet before deactivating the second solid state switch. 31. The transfer switch of claim 30, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to impose a minimum delay before deactivating the first solid state switch. 32. The transfer switch of claim 31, wherein the minimum delay is less than eight milliseconds. 33. The transfer switch of claim 27, wherein the first power source and the second power source are two different phases of a three phase power source. 34. A transfer switch with arc suppression circuitry, comprising: at least one microprocessor;a first solid state switch and a first relay in parallel, wherein the at least one microprocessor is in switch control communication with the first solid state switch and the first relay, and wherein the first solid state switch and the first relay are connectable to an outlet;a first power source input connectable to a first power source, the first power source input in power supply communication with the first solid state switch and the first relay;a second solid state switch and a second relay in parallel, wherein the at least one microprocessor is in switch control communication with the second solid state switch and the second relay, and wherein the second solid state switch and the second relay are connectable to the outlet;a second power source input connectable to a second power source, the second power source input in power supply communication with the second solid state switch and the second relay; anda non-transitory memory having instructions stored thereon that when executed by the at least one microprocessor cause the at least one microprocessor, upon detection of an interruption in the first power source, to: temporarily activate the first solid state switch to shunt current around the first relay while opening the first relay;temporarily activate the second solid state switch while closing the second relay so that the second relay channels power to the outlet. 35. The transfer switch of claim 34, wherein the first and second solid state switches are triacs. 36. The transfer switch of claim 34, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the first relay is opened before deactivating the first solid state switch. 37. The transfer switch of claim 36, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the second power source is providing power to the outlet before deactivating the second solid state switch. 38. The transfer switch of claim 37, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to impose a minimum delay before deactivating the first solid state switch. 39. The transfer switch of claim 38, wherein the minimum delay is less than eight milliseconds. 40. The transfer switch of claim 34, wherein the first power source and the second power source are two different phases of a three phase power source. 41. A transfer switch with arc suppression, comprising: at least one microprocessor;a first solid state switch and a first relay in parallel, wherein the at least one microprocessor is in communication with the first solid state switch and the first relay, and wherein the first solid state switch and the first relay are connected to an outlet;a second solid state switch and a second relay in parallel, wherein the at least one microprocessor is in switch control communication with the second solid state switch and the second relay, and wherein the second solid state switch and the second relay are connected to the outlet;a pair of power source inputs each including at least two phases from different three phase power sources, a first pair of phases from a three phase power source connected to a first power source input and a second pair of phases from a different three phase power source connected to a second power source input, the first power source input connected to the first solid state switch and the first relay and the second power source input connected to the second solid state switch and the second relay; anda non-transitory memory having instructions stored thereon that when executed by the at least one microprocessor cause the at least one microprocessor, upon detection of an interruption in the first power source, to: activate the first solid state switch to shunt current around the first relay while opening the first relay;deactivate the first solid state switch after the first relay is opened;activate the second solid state switch while closing the second relay; anddeactivate the second solid state switch after the second relay is closed so that voltage is available to the outlet via the second relay. 42. The transfer switch of claim 41, wherein the first and second solid state switches are triacs. 43. The transfer switch of claim 41, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the first relay is opened before deactivating the first solid state switch. 44. The transfer switch of claim 43, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to confirm that the second relay is closed before deactivating the second solid state switch. 45. The transfer switch of claim 44, wherein the non-transitory memory has instructions stored thereon that when executed by the at least one microprocessor further cause the at least one microprocessor to impose a minimum delay before deactivating the first solid state switch. 46. The transfer switch of claim 45, wherein the minimum delay is less than eight milliseconds.