Charging device and method, power adapter and terminal
US-10749371-B2 · Aug 18, 2020 · US
for voltage transformers
for voltage transformers · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/425 |
| Official title | {for voltage transformers} |
| Display label | for voltage transformers |
| Total patents | 97 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2017 | 6 |
| 2018 | 28 |
| 2019 | 21 |
| 2020 | 12 |
| 2021 | 5 |
| 2022 | 8 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Charging system and charging method and power adapter for charging a rechargeable battery
US-10680460-B2 · Jun 9, 2020 · US
Charging device, charging method, power adapter and terminal
US-2020083739-A1 · Mar 12, 2020 · US
Charging device, charging method, power adapter and terminal
US-10516290-B2 · Dec 24, 2019 · US
High voltage transformer apparatus
US-10490344-B2 · Nov 26, 2019 · US
Charging system and method, and power adapter
US-10418835-B2 · Sep 17, 2019 · US
Charging system and charging method, and power adapter
US-10411496-B2 · Sep 10, 2019 · US
High voltage transformer apparatus
US-2019252115-A1 · Aug 15, 2019 · US
Charging system, charging method, and power adapter
US-10381861-B2 · Aug 13, 2019 · US
Charging system, lightning protection method for terminal during charging, and power adapter
US-10348121-B2 · Jul 9, 2019 · US
Charging system and charging method, and power adapter
US-10340727-B2 · Jul 2, 2019 · US
Charging system, charging method, and power adapter
US-10340718-B2 · Jul 2, 2019 · US
Charging system, charging method, and power adapter
US-10340717-B2 · Jul 2, 2019 · US
High-fidelity voltage measurement using a capacitance-coupled voltage transformer
US-2019195918-A1 · Jun 27, 2019 · US
Charging device and terminal providing power with alternating current
US-10333331-B2 · Jun 25, 2019 · US
Charging system, charging method, and power adapter
US-10326297-B2 · Jun 18, 2019 · US
Charging system and method, and power adapter
US-10320217-B2 · Jun 11, 2019 · US
Charging system, charging method, and power adapter
US-10312712-B2 · Jun 4, 2019 · US
Charging device and method, power adapter and terminal
US-2019157895-A1 · May 23, 2019 · US
Charging system, lightning protection method for terminal during charging, and power adapter
US-10277053-B2 · Apr 30, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/425?
- CPC H01F27/425 is the Cooperative Patent Classification code for “for voltage transformers.”
- How many patents are filed under CPC H01F27/425 (for voltage transformers)?
- Our database includes 97 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/425 growing?
- Publication counts under this code: 6 in 2024 vs 3 in 2025 (latest complete years).