| Sonstiges: |
- Nachgewiesen in: USPTO Patent Grants
- Sprachen: English
- Patent Number: 9,651,977
- Publication Date: May 16, 2017
- Appl. No: 14/206389
- Application Filed: March 12, 2014
- Assignees: HiQ Solar, Inc. (Santa Clara, CA, US)
- Claim: 1. An apparatus including a system for controlling power factor correction (PFC) for three-phase AC power having a power signal frequency and one or more voltage-current (V-I) phase offsets, comprising: frequency control logic responsive to a plurality of data by providing frequency control data, by processing at least one of initial frequency data and aggregate phase data for said three-phase AC power with first measured power data related to respective phases of one of voltage and current of said three-phase AC power, and synthesized frequency data corresponding to said power signal frequency; frequency synthesizer logic coupled to said frequency control logic and responsive to said frequency control data by providing said synthesized frequency data; phase control logic coupled to said frequency synthesizer logic and responsive to another plurality of data by providing phase control data, by processing at least one of initial phase offset data and desired phase offset data for said three-phase AC power with said synthesized frequency data and second measured power data related to another of said voltage and current of said three-phase AC power; and waveform synthesizer logic coupled to said phase control logic and responsive to said phase control data by providing synthesized waveform data corresponding to respective phases of said three-phase AC power, wherein said phase control logic selectively operates in one of a plurality of correction modes, wherein said plurality of correction modes includes a frequency-based mode and a direct input-based mode, wherein in said frequency-based mode, said phase control logic reads a line frequency, compares said line frequency to a center frequency, and calculates a needed power factor phase offset based on comparing said line frequency and said center frequency.
- Claim: 2. The apparatus of claim 1 , wherein said frequency control logic, frequency synthesizer logic, phase control logic and waveform synthesizer logic together comprise at least one of a microprocessor and a programmable gate array.
- Claim: 3. The apparatus of claim 1 , wherein said frequency control logic comprises: a plurality of latches responsive to said first measured power data by latching said synthesized frequency data to provide latched frequency data; combining logic responsive to at least said latched frequency data by providing combined frequency data; and filter logic responsive to said combined frequency data by providing filtered frequency data.
- Claim: 4. The apparatus of claim 1 , wherein said frequency synthesizer logic comprises a direct digital synthesizer.
- Claim: 5. The apparatus of claim 1 , wherein said phase control logic comprises: first combining logic responsive to at least said synthesized frequency data and said desired phase offset data by providing combined phase data; correlation logic responsive to said combined phase data and said second measured power data by providing correlated phase data; filter logic responsive to said correlated phase data by providing filtered phase data; and second combining logic responsive to at least said synthesized frequency data and said filtered phase data by providing said phase control data.
- Claim: 6. The apparatus of claim 1 , wherein said waveform synthesizer logic comprises a lookup table responsive to said phase control data by providing said synthesized waveform data.
- Claim: 7. An apparatus including a programmable system for controlling power factor correction (PFC) for three-phase AC power having a power signal frequency and one or more voltage-current (V-I) phase offsets, comprising logic circuitry programmed to: respond to a plurality of data by providing frequency control data, by processing at least one of initial frequency data and aggregate phase data for said three-phase AC power with first measured power data related to respective phases of one of voltage and current of said three-phase AC power, and synthesized frequency data corresponding to said power signal frequency; respond to said frequency control data by providing said synthesized frequency data; respond to another plurality of data by providing phase control data, by processing at least one of initial phase offset data and desired phase offset data for said three-phase AC power with said synthesized frequency data and second measured power data related to another of said voltage and current of said three-phase AC power; and respond to said phase control data by providing synthesized waveform data corresponding to respective phases of said three-phase AC power, wherein said logic circuitry programmed to respond to said another plurality of data selectively operates in one of a plurality of correction modes, wherein said plurality of correction modes includes a frequency-based mode and a direct input-based mode, wherein in said frequency-based mode, said phase control logic reads a line frequency, compares said line frequency to a center frequency, and calculates a needed power factor phase offset based on comparing said line frequency and said center frequency.
- Claim: 8. The apparatus of claim 7 , wherein said logic circuitry comprises at least one of a microprocessor and a programmable gate array.
- Claim: 9. The apparatus of claim 7 , wherein said logic circuitry is programmed to respond to a plurality of data by providing frequency control data by: responding said first measured power data by latching said synthesized frequency data to provide latched frequency data; combining at least said latched frequency data to provide combined frequency data; and filtering said combined frequency data to provide filtered frequency data.
- Claim: 10. The apparatus of claim 7 , wherein said logic circuitry is programmed to respond to said frequency control data by providing said synthesized frequency data by direct digital synthesis.
- Claim: 11. The apparatus of claim 7 , wherein said logic circuitry is programmed to respond to another plurality of data by providing phase control data by: combining at least said synthesized frequency data and said desired phase offset data to provide combined phase data; correlating said combined phase data and said second measured power data to provide correlated phase data; filtering said correlated phase data to provide filtered phase data; and combining at least said synthesized frequency data and said filtered phase data to provide said phase control data.
- Claim: 12. The apparatus of claim 7 , wherein said logic circuitry is programmed to said phase control data by providing synthesized waveform data by accessing a lookup table with said phase control data to provide said synthesized waveform data.
- Claim: 13. A method for controlling power factor correction (PFC) for three-phase AC power having a power signal frequency and one or more voltage-current (V-I) phase offsets, comprising: responding to a plurality of data by providing frequency control data, by processing at least one of initial frequency data and aggregate phase data for said three-phase AC power with first measured power data related to respective phases of one of voltage and current of said three-phase AC power, and synthesized frequency data corresponding to said power signal frequency; responding to said frequency control data by providing said synthesized frequency data; responding to another plurality of data by providing phase control data, by processing at least one of initial phase offset data and desired phase offset data for said three-phase AC power with said synthesized frequency data and second measured power data related to another of said voltage and current of said three-phase AC power; and responding to said phase control data by providing synthesized waveform data corresponding to respective phases of said three-phase AC power, wherein said responding to said another plurality of data includes selectively operating in one of a plurality of correction modes, wherein said plurality of correction modes includes a frequency-based mode and a direct input-based mode, wherein in said frequency-based mode, said phase control logic reads a line frequency, compares said line frequency to a center frequency, and calculates a needed power factor phase offset based on comparing said line frequency and said center frequency.
- Claim: 14. The method of claim 13 , wherein said responding to a plurality of data, responding to said frequency control data, said responding to another plurality of data and said responding to said phase control data together comprise processing said data with at least one of a microprocessor and a programmable gate array.
- Claim: 15. The method of claim 13 , wherein said responding to a plurality of data by providing frequency control data comprises: responding to said first measured power data by latching said synthesized frequency data to provide latched frequency data; combining at least said latched frequency data to provide combined frequency data; and filtering said combined frequency data to provide filtered frequency data.
- Claim: 16. The method of claim 13 , wherein said responding to said frequency control data by providing said synthesized frequency data comprises direct digital synthesizing.
- Claim: 17. The method of claim 13 , wherein said responding to another plurality of data by providing phase control data comprises: combining at least said synthesized frequency data and said desired phase offset data to provide combined phase data; correlating said combined phase data and said second measured power data to provide correlated phase data; filtering said correlated phase data to provide filtered phase data; and combining at least said synthesized frequency data and said filtered phase data to provide said phase control data.
- Claim: 18. The method of claim 13 , wherein said responding to said phase control data by providing synthesized waveform data corresponding to respective phases of said three-phase AC power comprises accessing a lookup table with said phase control data to provide said synthesized waveform data.
- Patent References Cited: 5278490 January 1994 Smedley ; 5467294 November 1995 Hu ; 6072302 June 2000 Underwood ; 7012505 March 2006 Arden ; 8624436 January 2014 Willis ; 2004/0062058 April 2004 Hann et al. ; 2005/0017695 January 2005 Stanley ; 2007/0058401 March 2007 Tan et al. ; 2007/0253223 November 2007 Neidorff et al. ; 10-2010-0033656 March 2010 ; 0013285 March 2000
- Other References: International Search Report and Written Opinion in PCT/US2014/026165 issued on Jul. 21, 2014, 9 pages. cited by applicant ; E. Troester; New German Grid Codes for Connecting PV Systems to the Medium Voltage Power Grid; 2nd International Workshop on Concentrating Photovoltaic Power Plants: Optical Design, Production, Grid Connection; pp. 1-4; Germany. cited by applicant ; P. Mantovanelli Barbosa; Dissertation submitted to the Faculty of the Virginia Polytechnic Institute and State University entitled Three-Phase Power Factor Correction Circuits for Low-Cost Distributed Power Systems; Jul. 31, 2002; pp. 1-245; Blacksburg, VA. cited by applicant ; L. Moran, J. Dixon, R. Wallace; A Three-Phase Active Power Filter Operating with Fixed Switching Frequency for Reactive Power and Current Harmonic Compensation; IEEE Transactions on Industrial Electronics; Aug. 1995; pp. 402-408; vol. 42, No. 4. cited by applicant ; Wikipedia; Definition of atan2; pp. 1-7. cited by applicant ; Extended European Search Report dated Dec. 6, 2016 for EP Appln. 14774479.1; 8 pages. cited by applicant
- Assistant Examiner: Mata, Monica
- Primary Examiner: Dole, Timothy J
- Attorney, Agent or Firm: Fountainhead Law Group P.C.
|
