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System and methods for providing power to a generator control circuit are provided. Aspects include a generator, a first power converter comprising a first input and a first output, the first input coupled to an output of the generator and the first output coupled to a valve circuit, a second power converter comprising a second input and a second output, the second input coupled to the output of the generator and the second output coupled to the valve circuit, and a controller configured to monitor a characteristic associated with the generator, cause the first power converter to provide power to the valve circuit when the characteristic of the generator is within a first range of characteristic values, and cause the second power converter to provide power to the valve circuit when the characteristic of the generator is within a second range of characteristic values.

Titel:	Low-power bias supply to facilitate the low-RPM startup of three-phase AC aircraft generators
Autor/in / Beteiligte Person:	Hamilton Sundstrand Corporation
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2022
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 11527,975 Publication Date: December 13, 2022 Appl. No: 17/194681 Application Filed: March 08, 2021 Assignees: HAMILTON SUNDSTRAND CORPORATION (Charlotte, NC, US) Claim: 1. A power supply for a generator control circuit comprising: a generator; a low-power bias supply comprising a first input and a first output, the first input coupled to an output of the generator and the first output coupled to a valve circuit; a generator control unit (GCU) main internal power supply comprising a second input and a second output, the second input coupled to the output of the generator and the second output coupled to the valve circuit; and a controller configured to: monitor a characteristic associated with the generator; cause the low-power bias supply to provide power to the valve circuit when the characteristic of the generator is within a first range of characteristic values; and cause the GCU main internal power supply to provide power to the valve circuit when the characteristic of the generator is within a second range of characteristic values. Claim: 2. The power supply of claim 1 , wherein the first range of characteristic values is lower than the second range of characteristic values. Claim: 3. The power supply of claim 1 , wherein the first range of characteristic values overlaps with the second range of characteristic values. Claim: 4. The power supply of claim 1 , wherein the first range of characteristic values does not overlap with the second range of characteristic values. Claim: 5. The power supply of claim 1 , wherein the valve circuit comprises a servo-valve or servo-valve drive circuit. Claim: 6. The power supply of claim 1 , wherein the second output is further coupled to a GCU control circuit. Claim: 7. The power supply of claim 1 , wherein providing power to the valve circuit by the low-power bias supply responsive to a characteristic value of the generator being within a first range of characteristic values comprises: operating one or more switches coupled between the first output and the valve circuit to allow for power to be supplied to the valve circuit from the low-power bias supply. Claim: 8. The power supply of claim 1 , wherein providing power to the valve circuit by the second power converter responsive to the characteristic value of the generator being within the second range of characteristic values comprises: operating one or more switches coupled between the second output and the valve circuit to allow for power to be supplied to the valve circuit from GCU main internal power supply. Claim: 9. The power supply of claim 1 , wherein the generator comprises a permanent magnet generator. Claim: 10. The power supply of claim 1 , wherein the low-power bias supply comprises a low-power converter. Claim: 11. The power supply of claim 1 , wherein the characteristic associated with the generator comprises an output voltage. Claim: 12. The power supply of claim 1 , wherein the characteristic associated with the generator comprises a generator shaft speed. Claim: 13. The power supply of claim 1 , wherein the characteristic associated with the generator comprises a frequency of the generator. Claim: 14. A method comprising: providing a generator; providing a low-power bias supply comprising a first input and a first output, the first input coupled to an output of the generator and the first output coupled to a valve circuit; providing a generator control circuit (GCU) main internal power supply comprising a second input and a second output, the second input coupled to the output of the generator and the second output coupled to the valve circuit; monitoring, by a controller, a characteristic associated with the generator; causing, by the controller, the low-power bias supply to provide power to the valve circuit when the characteristic of the generator is within a first range of characteristic values; and causing, by the controller, the GCU main internal power supply to provide power to the valve circuit when the characteristic value of the generator being within a second range of characteristic values. Claim: 15. The method of claim 14 , wherein the first range of characteristic values is lower than the second range of characteristic values. Claim: 16. The method of claim 14 , wherein the first range of characteristic values overlaps with the second range of characteristic values. Claim: 17. The method of claim 14 , wherein the valve circuit comprises a servo-valve or servo-valve drive circuit. Claim: 18. The method of claim 14 , wherein the second output is further coupled to a GCU control circuit. Claim: 19. The method of claim 14 , wherein providing power to the valve circuit by the low-power bias supply responsive to a characteristic value of the generator being within a first range of characteristic values comprises: operating one or more switches coupled between the first output and the valve circuit to allow for power to be supplied to the valve circuit from the low-power bias supply. Claim: 20. The method of claim 14 , wherein providing power to the valve circuit by the GCU main internal power supply responsive to the characteristic value of the generator being within the second range of characteristic values comprises: operating one or more switches coupled between the second output and the valve circuit to allow for power to be supplied to the valve circuit from the GCU main internal power supply. Patent References Cited: 5153498 October 1992 Parro ; 6674274 January 2004 Hobrecht et al. ; 7370213 May 2008 Odaohhara ; 10498273 December 2019 Gao et al. ; 20100133813 June 2010 Cote ; 20120091716 April 2012 Cote et al. ; 20190352017 November 2019 Knope et al. ; 2510121 July 2014 Other References: European Search Report for Application No. 22160878.9, dated Jul. 26, 2022, 10 pages. cited by applicant Primary Examiner: Cavallari, Daniel Attorney, Agent or Firm: Cantor Colburn LLP

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Low-power bias supply to facilitate the low-RPM startup of three-phase AC aircraft generators