Choosing the Best Inductors for Phantom Power Supply Applications. | Helpful Trivia For Coil Users
Outline
In recent years, there has been a trend toward lighter wire harnesses, especially in the automotive market, and SAGAMI ELEC is also receiving an increasing number of inquiries about Phantom Power Supply Applications.
“Phantom Power Supply” is a method of supplying power through signal transmission lines and is often used in audio and communication equipment.
It is called phantom, meaning ghost , because of the ability to send power without a dedicated power cable and it requires only a small amount of current.
Using phantom power supply eliminates the need for a separate power supply connection and has the advantage of simplifying wiring.
Example Specifications/Standards
For example, in automotive camera systems, PoC(Power over Coax) technology is used to send signals and power together via coaxial cable. Inductors prevent the inflow of high-frequency signals and properly separate the DC component of the power line. Other examples of use include;
PoE（Power over Ethernet）
PoE refers to a technology that uses cables used in Ethernet to supply power and transmit data. Data transmission through Ethernet cables can be used to power IP cameras, IP telephones, PoE lighting fixtures, and other electrical products.
The operating principles of PSE (Power Sourcing Equipment) and PD (Power Device) are specified; PoE: IEEE 802.3af / POE+: IEEE 802.3at.
*We will mention PoE in the Columns in September 2024 or later.
Audio Equipment
Phantom Power Supply is also widely used in audio equipment because it has little effect on sound quality.
The power is supplied to microphones, PA speakers, etc. through audio lines.
(Connections are made using XLR male-to-female cables.)
The voltages include 12V, 18V, 24V, and 48V, but 48V is the most common.
If there is an ON/OFF switch specifically for Phantom, press the button marked "48V"etc.
Specified in JEITA RC-8162 / IEC 61938:2018.
Antenna
This technology enables the power supply through coaxial cables.
Inductor is used on the output line of the power supply.
It is needed to reject radio signals and to prevent collisions with the LDO regulator.
Considering that the lower frequency limit of the AM radio band is 148 kHz, the inductor L value of about 1mH is optimal.
Remote antenna power is supplied through a low-pass filter consisting of inductor and capacitor.
How to Choose the Perfect Inductors for Phantom Power Supply!
In response to the recent increase in demand, we have been sincerely working to reduce the cost of inductors that are best suited for Phantom Power Supply. Many customers have already decided to go with our products. We would be happy to receive your request once again, even if you have given up the adoption of our inductors after quotation in the past.
*To obtain high impedance, our ferrite type wire wound inductors with high magnetic permeability are the best choice!
7E06NA Series
7E06NA Series Features
Low Cost and Low Noise
- Low manufacturing cost by using multi-axis winding machines
- Low capital investment by using in-house production line
- Closed magnetic circuit structure, not pseudo-shielded by magnetic powder
Reliable Supply
- Long-run products in production for more than 15 years since the start of production
- BCP compliance with production in two countries and multiple material approvals
- AEC-Q200 compliant products
- Number of products supplied to the market : several hundred million units
Dimensions
| Inductance | DCR±30% | Isat (A) | Irat (A) | |
|---|---|---|---|---|
| Code | (µH) | |||
| 102 | 1000 | 3.9 | 0.14 | 0.22 |
The CER70 series, which is one size larger, is also available.
We Are Confident in Our Service
If you have any trouble with inductor characteristics, please contact us so that we can send you comparison data with our recommended products.
In addition, spice data for some of our products are available on our website. We are constantly adding data, but if there is a product for which you would like to receive data, we will give priority to your request. Please feel free to contact and request.
- Some of the products listed in this document are no longer in production.
- As some time has passed since the article was written, the information provided may still contain outdated content.
Helpful Trivia For Coil Users