H02M 1/4208
Arrangements for improving power factor of ac input
Official title: {Arrangements for improving power factor of AC input}
H02M1/4208 (Arrangements for improving power factor of ac input) appears on 4,379 US grants and 4,483 published applications in this corpus.
Search patents in H02M- Granted patents
- 4,379
- Published applications
- 4,483
- Assignees
- 1,378
- Inventors
- 6,717
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 6 | 0 |
| 1988 | 6 | 0 |
| 1989 | 11 | 0 |
| 1990 | 20 | 0 |
| 1991 | 24 | 0 |
| 1992 | 18 | 0 |
| 1993 | 18 | 0 |
| 1994 | 33 | 0 |
| 1995 | 48 | 0 |
| 1996 | 42 | 0 |
| 1997 | 69 | 0 |
| 1998 | 73 | 0 |
| 1999 | 74 | 0 |
| 2000 | 92 | 0 |
| 2001 | 79 | 11 |
| 2002 | 51 | 56 |
| 2003 | 49 | 51 |
| 2004 | 51 | 63 |
| 2005 | 49 | 86 |
| 2006 | 66 | 63 |
| 2007 | 45 | 57 |
| 2008 | 46 | 69 |
| 2009 | 52 | 84 |
| 2010 | 53 | 128 |
| 2011 | 70 | 148 |
| 2012 | 113 | 168 |
| 2013 | 137 | 219 |
| 2014 | 166 | 262 |
| 2015 | 208 | 273 |
| 2016 | 270 | 229 |
| 2017 | 251 | 218 |
| 2018 | 263 | 213 |
| 2019 | 262 | 221 |
| 2020 | 228 | 247 |
| 2021 | 199 | 249 |
| 2022 | 224 | 275 |
| 2023 | 211 | 291 |
| 2024 | 211 | 338 |
| 2025 | 295 | 258 |
| 2026 | 169 | 206 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H02M 1/4225Using a non-isolated boost converter1,940
- H02M 1/4258Using a single converter stage both for correction of ac input power747
- H02M 1/4233Using a bridge converter comprising active switches539
- H02M 1/4216Operating from a three-phase input voltage435
- H02M 1/4241Using a resonant converter267
- H02M 1/4266Using passive elements194
- H02M 1/425Using a single converter stage both for correction of ac input power165
- H02M 1/4291By using a buck converter to switch the input current137
Recent patents
- Power conversion apparatus, control apparatus, and switch-mode power supply6 Oct 2026US 12,756,298 B2Huawei Digital Power Technologies Co., Ltd.
- Series power factor correction boost converter and method6 Oct 2026US 12,756,299 B2Rockwell Collins, Inc.
- Power conversion circuit and power supply device6 Oct 2026US 12,756,328 B2Delta Electronics (Shanghai) Co., Ltd.
- Radiation hardened active power transformer29 Sep 2026US 12,749,617 B2Rockwell Collins, Inc.
- Power factor correction circuit accounting for zero crossing delay29 Sep 2026US 12,749,967 B2Samsung Electronics Co., Ltd.
- Power supply circuit8 Oct 2026US 2026/0312511 A1Fuji Electric Co., Ltd.
- Flexible powering architectures1 Oct 2026US 2026/0302827 A1Alpha Technologies Inc.
- Bidirectional power supply device1 Oct 2026US 2026/0302926 A1Kabushiki Kaisha Toyota Jidoshokki
- Ac-to-dc voltage converter1 Oct 2026US 2026/0302934 A1
- Method for detecting the presence or absence of a neutral conductive line in a multiphase ac voltage source1 Oct 2026US 2026/0302970 A1Schaeffler Technologies AG & Co. KG
Most cited
By later US patents
- Apparatus for controlling electric motor861US 4,788,485 AMitsubishi Denki Kabushiki Kaisha · 1988
- High frequency inverter with power-line-controlled frequency modulation615US 5,404,082 ANorth American Philips Corporation · 1995
- Universal ballast control circuit611US 6,137,240 ALumion Corporation · 2000
- Power supply for light emitting diode array454US 5,661,645 A1997
- LED power control methods and apparatus433US 7,256,554 B2Color Kinetics Incorporated · 2007