Standard power inductors have been proved to have limitations for new high current demanding applications. Prax advanced high current power inductors combine special materials and shapes with flat wire helical winding for a very compact and efficient design. Advantages of Flat Wire Inductors for High Frequency, High Current Designs SR SRF 10/10 e/IC1046 As electronics become faster and smaller it is important that the components scale appropriately, and inductors are no exception. Because the inductors are wirewound, the solution to providing a highly conductive wire in the most compact package.
Here you can calculate the inductance for a given size of a spiral coil wound in one layer. It is optional to add the capacitance for f.ex. a primary tank capacitor or topload capacitance to find the resonant frequency of the LC circuit.
The formulas used to derive the inductance is simplified and correct to within 1%. Source “Harold A. Wheeler, “Simple Inductance Formulas for Radio Coils,” Proceedings of the I.R.E., October 1928, pp. 1398-1400.”
Switch between the input fields to automatically calculate the values.
Formulas used
Outer diameter = inner diameter + ( 2 * number of turns * ( wire diameter + wire spacing))
Wire length = ((Pi * number of turns * (outer diameter + inner diameter)) / 2) / 1000
Inductance
Width w = ((wire diameter / 25.4) + (wire spacing / 25.4)) * number of turns
Radius r = ((inner diameter / 25.4) + w) / 2
Inductance = (radius^2 * number of turns^2) / (8 * radius + 11 * width)
Resonant frequency = (1 / (2 * pi * sqrt((inductance / 1000000) * (capacitance / 1000000000)))) / 1000
Outer diameter = inner diameter + ( 2 * number of turns * ( wire diameter + wire spacing))
Wire length = ((Pi * number of turns * (outer diameter + inner diameter)) / 2) / 1000
Inductance
Width w = ((wire diameter / 25.4) + (wire spacing / 25.4)) * number of turns
Radius r = ((inner diameter / 25.4) + w) / 2
Inductance = (radius^2 * number of turns^2) / (8 * radius + 11 * width)
Resonant frequency = (1 / (2 * pi * sqrt((inductance / 1000000) * (capacitance / 1000000000)))) / 1000
Overview of Power Inductors
Power inductors are used to store energy, provide lower signal losses, filter EMI noise, and yield lower core losses in applications where voltage conversion is necessary.
Before you can gain a good understanding of power inductors, it’s important to first familiarize yourself with the larger category of inductors.
What Are Inductors?
To understand inductors as a whole, you need a basic knowledge of magnetism and a few fundamental electromagnetic field laws. You can learn more about the basic principles of inductive components in our Trilogy of Magnetics design guide.
Basically, an inductor is a passive electrical component with two terminals that store energy in their magnetic field. Inductors are designed to create inductance for conductors. Generally, inductors are wrapped around a core material (such as iron) to increase inductance.
There are many different types of inductors, including multilayer inductors, RF inductors, toroid inductors, wire-wound inductors, and, of course, power inductors.
What Are Power Inductors?
A power inductor is an electronic component that both receives and stores electrical energy by using a magnetic field (usually created with a tightly coiled conductive wire). Power inductors serve to maintain a steady current in an electrical circuit with a varying current and/or voltage.
With switched-mode power supplies becoming increasingly common, semiconductor manufacturers have begun offering a wide range of power inductors with simplified circuit design.
To fully utilize the advantages of switching regulators, you should take care in selecting the appropriate storage choke.
Power inductors can be differentiated using criteria such as inductance, DCR, rated current, saturation current, and frequency range. They can also be categorized by type (see “Types of Power Inductors” below).
Applications of Power Inductors
The applications of power magnetics in general are vast and varied:
- Filter circuits
- Audio circuitry
- Video circuitry
- Interfaces
- RF circuits
- Motor control units
- SMPS basics circuits
- Mains filters
- Power supply
![Wire Wire](/uploads/1/2/5/6/125601671/438846313.jpg)
The smaller subset of power inductors has more specific applications. There are three main applications of power inductors:
- Conducted EMI noise filters in AC inputs
- Low-pass frequency noise filters for low-frequency ripple current noise
- Energy storage in DC/DC converters