H02P 9/44
Control of frequency and voltage in predetermined relation
Official title: Control of frequency and voltage in predetermined relation, e.g. constant ratio
H02P9/44 (Control of frequency and voltage in predetermined relation) appears on 30 US grants and 24 published applications in this corpus.
Search patents in H02P- Granted patents
- 30
- Published applications
- 24
- Assignees
- 31
- Inventors
- 83
- Latest grant
- 8 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 1 | 6 |
| 2019 | 3 | 4 |
| 2020 | 5 | 0 |
| 2021 | 2 | 2 |
| 2022 | 1 | 3 |
| 2023 | 2 | 1 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Wind turbine, and control method and apparatus for converter of wind turbine8 Jul 2025US 12,355,248 B2Goldwind Science & Technology Co., Ltd.
- Dynamic frequency to voltage ratio for regulator machine26 Mar 2024US 11,942,891 B2Kohler Co.
- Saturable reactors in generator control units5 Mar 2024US 11,923,800 B2Hamilton Sundstrand Corporation
- Electric power generation system (EPGS) controller excitation system architecture for variable frequency generators25 Jul 2023US 11,711,036 B1Hamilton Sundstrand Corporation
- Electric vehicle sound enhancement30 May 2023US 11,660,969 B2GM Global Technology Operations LLC
- Wind turbine, and control method and apparatus for converter of wind turbine24 Apr 2025US 2025/0132567 A1Goldwind Science & Technology Co., Ltd.
- Dynamic frequency to voltage ratio for regulator machine6 Jun 2024US 2024/0186925 A1Kohler Co.
- Saturable reactors in generator control units9 Nov 2023US 2023/0361700 A1Hamilton Sundstrand Corporation
- Dynamic frequency to voltage ratio for regulator machine15 Dec 2022US 2022/0399840 A1Kohler Co.
- Variable-frequency generator set integrated system driven by internal combustion engine28 Jul 2022US 2022/0239192 A1Chongqing Lihua Automation Technology Co., Ltd.
Most cited
By later US patents
- Modulated induction generator25US 3,958,174 ABorg-Warner Corporation · 1976
- Load control for wind-driven electric generators22US 4,146,264 A1979
- Excitation control apparatus for synchronous machine14US 5,440,222 AMitsubishi Denki Kabushiki Kaisha · 1995
- Variable speed/variable voltage generator set12US 4,926,108 A1990
- Method for regulating the voltage of an electric generator and a system for the application of said method8US 4,219,768 AMoteurs Leroy-Somer · 1980