Transformer filter arrangement
US-9853621-B2 · Dec 26, 2017 · US
Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H)
Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/42 |
| Official title | Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) |
| Display label | Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H) |
| Total patents | 258 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 18 |
| 2016 | 28 |
| 2017 | 31 |
| 2018 | 35 |
| 2019 | 27 |
| 2020 | 15 |
| 2021 | 29 |
| 2022 | 20 |
| 2023 | 11 |
| 2024 | 18 |
| 2025 | 21 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Varainductor and operation method thereof based on mutual capacitance
US-9812251-B2 · Nov 7, 2017 · US
Igniter semiconductor device, igniter system, and ignition coil unit
US-9771916-B2 · Sep 26, 2017 · US
Wireless power transmission via inductive coupling using di/dt as the magnetic modulation scheme
US-9762089-B2 · Sep 12, 2017 · US
Inductive energy transmission system
US-2017256355-A1 · Sep 7, 2017 · US
Low crosstalk magnetic devices
US-2017236636-A1 · Aug 17, 2017 · US
Wireless Power and Data Transfer for Unmanned Vehicles
US-2017207658-A1 · Jul 20, 2017 · US
Low crosstalk magnetic devices
US-9646762-B2 · May 9, 2017 · US
Power converter transformer with reduced leakage inductance
US-2017117091-A1 · Apr 27, 2017 · US
Power device including current transformer and method for compensating of current transformer
US-9612275-B2 · Apr 4, 2017 · US
Step-Up Power Transformer with Integral Sine-Wave Filter for PWM Inverters
US-2017077861-A1 · Mar 16, 2017 · US
Power feeding coil unit and wireless power transmission device
US-9558882-B2 · Jan 31, 2017 · US
Transformer filter arrangement
US-9548155-B2 · Jan 17, 2017 · US
Transformer, method for manufacturing transformer and chip
US-9543073-B2 · Jan 10, 2017 · US
Power conversion device with a plurality of series circuits
US-2016365807-A1 · Dec 15, 2016 · US
Power feeding coil unit and wireless power transmission device
US-9515493-B2 · Dec 6, 2016 · US
Transformer filter arrangement
US-9509273-B2 · Nov 29, 2016 · US
Phase locked loop including a varainductor
US-9478344-B2 · Oct 25, 2016 · US
Current regulator with feedback circuit for ac coupling
US-2016301321-A1 · Oct 13, 2016 · US
Device and Method for Reducing a Magnetic Unidirectional Flux Component of a Transformer Core
US-2016300662-A1 · Oct 13, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/42?
- CPC H01F27/42 is the Cooperative Patent Classification code for “Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H).”
- How many patents are filed under CPC H01F27/42 (Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils (circuits for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output H02P13/00; impedance networks H03H))?
- Our database includes 258 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/42 growing?
- Publication counts under this code: 18 in 2024 vs 21 in 2025 (latest complete years).