G01R 31/42
Ac power supplies
Official title: AC power supplies
G01R31/42 (Ac power supplies) appears on 836 US grants and 968 published applications in this corpus.
Search patents in G01R- Granted patents
- 836
- Published applications
- 968
- Assignees
- 467
- Inventors
- 2,088
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 10 | 0 |
| 1996 | 12 | 0 |
| 1997 | 5 | 0 |
| 1998 | 12 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 7 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 5 |
| 2005 | 3 | 5 |
| 2006 | 3 | 6 |
| 2007 | 4 | 10 |
| 2008 | 9 | 10 |
| 2009 | 9 | 16 |
| 2010 | 12 | 24 |
| 2011 | 15 | 28 |
| 2012 | 24 | 47 |
| 2013 | 19 | 39 |
| 2014 | 34 | 48 |
| 2015 | 35 | 68 |
| 2016 | 51 | 60 |
| 2017 | 70 | 56 |
| 2018 | 41 | 61 |
| 2019 | 59 | 60 |
| 2020 | 59 | 60 |
| 2021 | 55 | 46 |
| 2022 | 54 | 56 |
| 2023 | 43 | 43 |
| 2024 | 46 | 106 |
| 2025 | 84 | 65 |
| 2026 | 34 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and device for detecting a short circuit of a semiconductor switch element in an inverter for energizing an electric drive in an electric vehicle or hybrid vehicle; inverter comprising such a device1 Sep 2026US 12,724,088 B2ZF Friedrichshafen AG
- Insulation detection method and apparatus for conversion system25 Aug 2026US 12,716,931 B2Delta Electronics (Shanghai) Co., Ltd.
- Method for power calibration18 Aug 2026US 12,710,458 B2ElectDis AB
- Photovoltaic inverter18 Aug 2026US 12,712,464 B2Delta Electronics, Inc.
- Current-detecting method for overcoming the limitations of lower-arm current detection11 Aug 2026US 12,704,531 B2Delta Electronics, Inc.
- Method and computer program for detecting a short-circuit in a power converter, controller for controlling a power converter, and computer-readable medium8 Oct 2026US 2026/0309803 A1
- Energy storage systems and methods for predictive health monitoring and fault detection for a power conversion system8 Oct 2026US 2026/0312404 A1LG Energy Solution, Ltd.
- Power converter, method and apparatus for insulation detection thereof17 Sep 2026US 2026/0276690 A1Sungrow Power Supply Co., Ltd.
- Ac power generation comprising a non-inductive overvoltage protection device10 Sep 2026US 2026/0269603 A1
- System and method for performing element-based line-wise power flow analysis for multi-phase AC-DC power System10 Sep 2026US 2026/0269645 A1
Most cited
By later US patents
- Digital ac monitor152US 4,672,555 AMassachusetts Institute of Technology · 1987
- Diagnostic circuit protection device95US 5,452,173 AChallenge Technologies, Inc. · 1995
- Power monitoring module with display unit for electrical power source device87US 6,476,729 B12002
- Method and system for testing electric automotive drive systems77US 8,310,272 B2GM Global Technology Operations LLC · 2012
- Apparatus and method for power disturbance analysis and storage of power quality information71US 5,899,960 AReliable Power Meters, Inc. · 1999