IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0041784
(2011-03-07)
|
등록번호 |
US-8674555
(2014-03-18)
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발명자
/ 주소 |
- Galm, James M.
- Butkus, Ged
- Bhanoo, Milind M.
|
출원인 / 주소 |
- LayerZero Power Systems, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
17 |
초록
▼
A hybrid neutral transfer switch in an electrical system to transfer a load between multiple AC power sources is provided. The hybrid neutral transfer switch includes a neutral gate controlled device connected to a neutral input of each of the multiple power sources and a mechanical transfer switch
A hybrid neutral transfer switch in an electrical system to transfer a load between multiple AC power sources is provided. The hybrid neutral transfer switch includes a neutral gate controlled device connected to a neutral input of each of the multiple power sources and a mechanical transfer switch that switches between the neutral input of each of the power sources. During the transfer of power from one power source to another power source, the neutral gate controlled devices are activated and/or deactivated in conjunction with the switching of the mechanical transfer switch from one neutral input to another neutral input.
대표청구항
▼
1. A neutral transfer switch in an electrical system to transfer a load between a plurality of AC power sources, the neutral transfer switch comprising: a gate controlled device connected to a neutral input of each of the plurality of power sources;a mechanical transfer switch switchably connected t
1. A neutral transfer switch in an electrical system to transfer a load between a plurality of AC power sources, the neutral transfer switch comprising: a gate controlled device connected to a neutral input of each of the plurality of power sources;a mechanical transfer switch switchably connected to the neutral input of each of the plurality of power sources;wherein when one of the plurality of power sources is active and supplying power to the load, the gate controlled device associated with the active power source is active, the mechanical transfer switch is connected to the neutral input of the active power source, the mechanical transfer switch is connected in parallel with the gate controlled device associated with the active power source, and current from the active power source is flowing through the mechanical transfer switch to the load. 2. The neutral transfer switch of claim 1, wherein when one of the plurality of power sources is supplying power to the load and a transfer command is initiated to transfer power from the one of the plurality of power sources to another of the plurality of power sources, at a time t0, transfer of the mechanical transfer switch is initiated, deactivation of the gate controlled device associated with the off going power source is initiated, and activation of the gate controlled device associated with the oncoming power source is initiated such that the neutral input of the off going power source and the neutral input of the on coming power source are temporarily connected and current flows through the oncoming gate controlled device to the load, and wherein at a time t1, deactivation of the off going gate controlled device is complete. 3. The neutral transfer switch of claim 2, wherein at a time t2, the mechanical transfer switch is disconnected from the neutral input of the off going power source thereby disconnecting the neutral inputs of the off going power and the on coming power source, and wherein at a time t3, the mechanical transfer switch is connected to the neutral input of the on coming power source and the current from the neutral input of the oncoming power source is diverted from the oncoming gate controlled device through the mechanical transfer switch to the load. 4. The neutral transfer switch of claim 3, wherein the off going gate controlled device includes a first set of plurality of silicon controlled rectifiers connected in parallel, and wherein the oncoming gate controlled device includes a second set of plurality of silicon controlled rectifiers connected in parallel. 5. The neutral transfer switch of claim 4, wherein a main controller and a gate array controller are provided to control the activation and deactivation of the gate controlled devices connected to the neutral input of the plurality of power sources and the switching of the mechanical transfer switch. 6. A hybrid transfer switch in an electrical system to transfer a load from a first power source to a second power source, the hybrid transfer switch comprising: a first gate controlled device connected to the first power source;a second gate controlled device connected to the second power source;a mechanical transfer switch switchably connected to the first power source and the second power source,wherein when the first power source is supplying power to the load, the first gate controlled device is active, the mechanical transfer switch is connected to the first power source, the mechanical transfer switch is connected in parallel with the first gate controlled device, and current from the first power source is flowing through the mechanical transfer switch to the load, andwherein when the second power source is supplying power to the load, the second gate controlled device is active, the mechanical transfer switch is connected to the second power source, the mechanical transfer switch is connected in parallel with the second gate controlled device, and current from the second power source is flowing through the mechanical transfer switch to the load. 7. The hybrid transfer switch of claim 6, wherein the first gate controlled device is connected to a first neutral input of the first power source, the second gate controlled device is connected to a second neutral input of the second power source, and the mechanical transfer switch switches between the first neutral input and the second neutral input. 8. The hybrid transfer switch of claim 7, wherein when the first power source is active and supplying power to the load and a transfer command is initiated to transfer power from the first power source to the second power source, at a time t0, transfer of the mechanical transfer switch is initiated, deactivation of the first gate controlled device is initiated, and the second gate controlled device is activated such that the first neutral input of the first power source and the second neutral input of the second power source are temporarily connected and current flows through the second gate controlled device to the load, and wherein at a time t1, deactivation of the first gate controlled device is complete. 9. The hybrid transfer switch of claim 8, wherein at a time t2, the mechanical transfer switch is connected to the second neutral input and the current from the second neutral input is diverted from the second gate controlled device through the mechanical transfer switch to the load, and wherein at a time t3, the mechanical transfer switch is disconnected from the first neutral input. 10. The hybrid transfer switch of claim 9, wherein the first gate controlled device includes a first pair of silicon controlled rectifiers connected in parallel, and wherein the second gate controlled device includes a second pair of silicon controlled rectifiers connected in parallel. 11. The hybrid transfer switch of claim 10, wherein a main controller and a gate array controller are provided to control the activation and deactivation of the first gate controlled device and the second gate controlled device and the switching of the mechanical transfer switch. 12. A switching apparatus to transfer power to a load from a first power source to a second power source comprising: a first set of phase gate controlled devices connected to a first set of phase inputs of the first power source;a second set of phase gate controlled devices connected to a second set of phase inputs of the second power source;a first neutral gate controlled device connected to a first neutral input of the first power source;a second neutral gate controlled device connected to a second neutral input of the second power source;a mechanical transfer switch switchably connected to the first neutral input of the first power source and the second neutral input of the second power source,wherein when the first power source is supplying power to the load, the first neutral gate controlled device is active, the mechanical transfer switch is connected to the first neutral input of the first power source, the mechanical transfer switch is connected in parallel with the first neutral gate controlled device, and current from the first neutral input of the first power source is flowing through the mechanical transfer switch to the load, andwherein when the second power source is supplying power to the load, the second neutral gate controlled device is active, the mechanical transfer switch is connected to the second neutral input of the second power source, the mechanical transfer switch is connected in parallel with the second neutral gate controlled device, and current from the second neutral input of the second power source is flowing through the mechanical transfer switch to the load. 13. The switching apparatus of claim 12, wherein when the first power source is active and supplying power to the load and a transfer command is initiated to transfer power from the first power source to the second power source, at a time t0, transfer of the mechanical transfer switch is initiated, deactivation of the first set of phase gate controlled devices is initiated, deactivation of the first gate controlled device is initiated, and the second gate controlled device is activated such that the first neutral input of the first power source and the second neutral input of the second power source are temporarily connected and a current flows through the second gate controlled device to the load. 14. The switching apparatus of claim 13, wherein at a time t1, the second set of phase gate controlled devices are activated and deactivation of the first set of phase gate controlled devices and the first gate controlled device is complete. 15. The switching apparatus of claim 14, wherein at a time t2, the mechanical transfer switch is disconnected from the first neutral input thereby disconnecting the first neutral input and the second neutral input, and wherein at a time t3, the mechanical transfer switch is connected to the second neutral input and current from the second neutral input is diverted from the second neutral gate controlled device through the mechanical transfer switch to the load. 16. A method to transfer power to a load from an active power source to an inactive power source comprising: at time t0 initiating a transfer of a mechanical transfer switch;deactivating an active set of gate controlled devices connected to a first set of inputs of the active power source;activating an inactive neutral gate controlled device connected to a neutral input of the inactive power source;at time t1 activating an inactive set of phase gate controlled devices connected to a second set of phase inputs of the inactive power source;at time t2 disconnecting the mechanical transfer switch from a neutral input of the active power source or connecting the mechanical transfer switch to the neutral input of the inactive power source; andat time t3 connecting the mechanical transfer switch to the neutral input of the inactive power source or disconnecting the mechanical transfer switch from a neutral input of the active power source. 17. The method of claim 16 further comprising diverting current from the inactive neutral gate controlled device of the inactive power source through the mechanical transfer switch. 18. The method of claim 17, wherein deactivating an active set of gate controlled devices includes: deactivating an active set of phase gate controlled devices connected to a first set of phase inputs of the active power source; anddeactivating an active neutral gate controlled device connected to the neutral input of the active power source. 19. The method of claim 18, wherein at time t0, upon activating the inactive neutral gate controlled device connected to the neutral input of the inactive power source, the neutral input of the active power source and the neutral input of the inactive power are temporarily connected. 20. The method of claim 19, wherein at time t2, upon disconnecting the mechanical transfer switch from the neutral input of the active power source, the neutral input of the active power source and the neutral input of the inactive power source are disconnected.
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