Transformer and method of generating multiple multiphase output signals
US-12462974-B2 · Nov 4, 2025 · US
Auto-transformers
Auto-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 | H01F30/02 |
| Official title | Auto-transformers |
| Display label | Auto-transformers |
| Total patents | 61 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 4 |
| 2017 | 4 |
| 2018 | 6 |
| 2019 | 7 |
| 2020 | 7 |
| 2021 | 10 |
| 2022 | 5 |
| 2023 | 5 |
| 2024 | 6 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Power converter with multi-tapped autotransformer
US-2025202353-A1 · Jun 19, 2025 · US
Autotransformer, autotransformer-rectifier unit and method for connecting a piece of electrical equipment to a three-phase grid by means of an autotransformer-rectifier unit
US-12266469-B2 · Apr 1, 2025 · US
New broadband balun structures and applications thereof
US-2025047255-A1 · Feb 6, 2025 · US
Radio frequency auto-transformer, radio frequency device and method of construction of an auto-transformer
US-12106884-B2 · Oct 1, 2024 · US
Transformer and method of generating multiple multiphase output signals
US-2024274350-A1 · Aug 15, 2024 · US
Power conversion phases and coupling inductance
US-2024223092-A1 · Jul 4, 2024 · US
Power converter/transformer assembly and current balance
US-2024223089-A1 · Jul 4, 2024 · US
Transformer and method of generating multiple multiphase output signals
US-11967453-B2 · Apr 23, 2024 · US
Integrated auto-transformer based zero or 180 degrees phase shifter
US-2024120148-A1 · Apr 11, 2024 · US
Heat transfer from transformer windings
US-2023395313-A1 · Dec 7, 2023 · US
Power supply multi-tapped autotransformer
US-11749454-B2 · Sep 5, 2023 · US
Autotransformer, autotransformer-rectifier unit and method for connecting a piece of electrical equipment to a three-phase grid by means of an autotransformer-rectifier unit
US-2023274877-A1 · Aug 31, 2023 · US
Autotransformer rectifier unit system
US-11670447-B2 · Jun 6, 2023 · US
Transformer
US-2023170126-A1 · Jun 1, 2023 · US
Phase-shift autotransformer, multi-pulse rectifier systems and fast charging
US-2022399162-A1 · Dec 15, 2022 · US
Phase-shift autotransformer, multi-pulse rectifier systems and fast charging
US-11450477-B2 · Sep 20, 2022 · US
Radio frequency auto-transformer, radio frequency device and method of construction of an auto-transformer
US-2022285081-A1 · Sep 8, 2022 · US
Power system architecture with reduced common mode voltage
US-11277075-B2 · Mar 15, 2022 · US
Power converters, power distribution systems and methods of converting power
US-11228254-B2 · Jan 18, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F30/02?
- CPC H01F30/02 is the Cooperative Patent Classification code for “Auto-transformers.”
- How many patents are filed under CPC H01F30/02 (Auto-transformers)?
- Our database includes 61 publications tagged with this CPC code.
- Is patent activity under CPC H01F30/02 growing?
- Publication counts under this code: 6 in 2024 vs 4 in 2025 (latest complete years).