H02H 7/1216
For ac-ac converters
Official title: {for AC-AC converters}
H02H7/1216 (For ac-ac converters) appears on 158 US grants and 132 published applications in this corpus.
Search patents in H02H- Granted patents
- 158
- Published applications
- 132
- Assignees
- 93
- Inventors
- 356
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 1 |
| 2003 | 1 | 2 |
| 2004 | 2 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 3 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 2 |
| 2010 | 2 | 1 |
| 2011 | 3 | 3 |
| 2012 | 1 | 3 |
| 2013 | 2 | 8 |
| 2014 | 3 | 5 |
| 2015 | 6 | 12 |
| 2016 | 7 | 9 |
| 2017 | 13 | 11 |
| 2018 | 15 | 18 |
| 2019 | 12 | 13 |
| 2020 | 12 | 13 |
| 2021 | 17 | 7 |
| 2022 | 5 | 5 |
| 2023 | 11 | 6 |
| 2024 | 3 | 3 |
| 2025 | 3 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Method for detecting earth faults and frequency converter system with earth fault detection30 Dec 2025US 12,510,606 B2Hitachi Energy Ltd
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- Resistive sub-module hybrid MMC and direct current fault processing strategy thereof16 Jul 2024US 12,040,606 B2Zhejiang University
- Rectifier with inrush protection bypass passing current in one direction only and method for starting up power supply to a rectifier27 Aug 2026US 2026/0254228 A1
- Method for detecting earth faults and frequency converter system with earth fault detection14 Aug 2025US 2025/0258249 A1Hitachi Energy Ltd
- Pre-charge circuits for direct current bus transient voltage protection26 Jun 2025US 2025/0210969 A1
- Overcurrent protection20 Mar 2025US 2025/0093392 A1Infineon Technologies Austria AG
- Intelligent power distribution and regulation28 Nov 2024US 2024/0396464 A1Amber Semiconductor, Inc.
Most cited
By later US patents
- Method and apparatus for controlling refrigerator cycle115US 5,483,141 AKabushiki Kaisha Toshiba · 1996
- Current limiter device70US 5,796,568 AAsea Brown Boveri AG · 1998
- Ride-through protection circuit for a voltage source inverter traction motor drive60US 5,127,085 AGeneral Motors Corporation · 1992
- Coordinated load commutated inverter protection system51US 4,475,150 AGeneral Electric Company · 1984
- Conversion circuit for limiting inrush current48US 4,864,482 AEtta Industries, Inc. · 1989