Hi, All I am Vinay YN a Product Engineer In Profession, I do experiments with new technologies and I will share those details by making simple projects On opensource Platforms. this is my first blog in the element14 community.
By Using the Magnetic Components Kit I had planned to create a Noise Minimized Power distribution circuit For critical Devices. In this blog, you will get a brief knowledge of Magnetic components, Design consideration, and More.
In order To start the Experiment, we must Know The Basics of the Operation, Characteristics of the Components, and Limitations of the components. for that, we need to follow the Basics Terminologies and Datasheet provided by the manufactures.
Let's start with Basics
Every Electrical appliance in the world is included with Magnetic components and Magnetics components Had played a Major Role in the Evolution Of Technology. Let's Start Learning about Magnetic components.
Magnetic components are passive elements that rely on an internal magnetic field to alter electrical current. Depending on their configuration and function, magnetic components can be categorized into
- Low-frequency magnetic components. These elements are generally designed for use in applications involving frequencies between 50 to 500 Hz and voltages of 220 to 240 VAC. Typical applications include conveyor systems, HVAC systems, line filtering, motor drives, and uninterrupted power supplies (UPSs).
- High-frequency magnetic components. These elements are designed for frequencies in the kilohertz (kHz) or Megahertz (MHz) range. Typical applications include computers, communication systems, electric cars, and mobile device charging systems.
- Isolated magnetic components. These elements protect users from electrical shock in applications where incidental contact may occur. Typical applications include laptop power supplies and wearable medical devices.
- Non-isolated magnetic components. These elements reduce noise or briefly store energy for use in future operations. They are generally used in applications where human contact is less of a concern.
Magnetic components are classified into two main product groups: Transformers and Inductors.
- Transformers change the voltage level by stepping it up or down,
- Inductors introduce resistance to the circuit and store current.
Both products rely on the property of electromagnetic inductance, which was discovered by English scientist and inventor Michael Faraday and American scientist Joseph Henry separately but concurrently in the 1830s. Faraday’s Law, as it is often called, describes how changes in the magnetic environment of a circuit result in the generation of electrical current and, conversely, how an electrical current generates a magnetic field.
Below more detailed description of transformers and inductors, outlining their function, basic design and construction elements, types available, and key design and selection considerations.
Transformers
Transformers consist of two or more coils of wire that allow for the transference of electrical energy when subjected to a changing magnetic field. They are primarily used when the power within a circuit must be transferred between two different levels. In addition to stepping the voltage up or down, they also function as filters or stabilizers for the circuit’s voltage levels.
Types of Transformers
These magnetic components are available in many designs and configurations, each of which is suitable for different use cases. Some of the most common include:
- Single-phase transformers: Single-phase transformers contain two windings, a primary and a secondary one. By connecting the two components, they enable the transfer of AC power from one circuit to another.
- Three-phase transformers: Three-phase transformers consist of primary and secondary windings that each contain three separate but connected windings. They are generally used for the generation, transmission, and distribution of electrical power in industrial applications.
- Step-up/step-down transformers: These transformers increase (step-up) or decrease (step-down) the voltage as current flows through them.
- Power transformers: Power transformers are used for the transmission of higher voltages within and between systems.
- Current transformers: Current transformers are used for measuring or monitoring current for control and/or load centers. They are implemented for current measurement, electrical load monitoring, energy, and sub-metering products, network equipment, instruments and sensors, control systems, and green initiatives.
- Isolation transformers: Isolation transformers regulate high current and voltage levels by separating the primary and secondary windings. This design protects any devices connected to the secondary windings from overload damage. Current transformers and potential (i.e., voltage) transformers are both variations on this design.
Transformer Design and Selection Considerations
When designing and selecting a transformer, there are many factors to keep in mind to ensure it functions as intended. Some of the key considerations include:
- Winding design: The way a winding is coiled around the transformer core significantly affects the component’s efficiency and durability, as well as the resulting transformer type (i.e. flyback, push-pull). There are two types of electrical coils: primary and secondary windings. In a nutshell, primary windings receive power while secondary windings deliver the power. These windings are not electrically connected but share a common core, enabling the transfer of electrical power between the two coils. Voltage and current are directly correlated to the number of the primary and secondary coils’ turns around the core.
- Material: Similar to the design of the winding, the material used for the construction of the winding and insulation can affect the performance of a transformer. Typical winding materials include aluminum and copper, and typical insulation materials include meta-aramid. The material makeup of the transformer core itself enables a successful pathway for magnetic flux. As well, the extent to which a magnetic field can be increased by the core is dependent on the magnetic permeability of the transformer core material. Examples of common transformer core materials include Amorphous Steel Core: ideal for high temperature, high efficiency, or medium frequency transformers; one of the most commonly implemented transformer core materials.
- Solid Iron Core: This core material is able to produce high magnetic fields without iron saturation; DC applications are typical use cases.
- Laminated Silicon Steel/Iron Core: Laminated cores are created by thin sheets of stacked silicon steel or iron, which are coated with an insulating layer to prevent losses of energy via eddy current in alternating current (AC) components.
- Size: The size of the transformer needed depends on the expected load capacity required. Other factors that influence size include future growth expectations, space constraints, and budget limits.
Inductors
Inductor consists of a wire coil or loop wound around a metal core. They allow for the storage of energy and the introduction of resistance to a circuit. As current runs through the circuit, the element stores it in the form of magnetic energy. When the current flow ceases, the magnetic field generates a voltage in the conductor.
Types of Inductors
Similar to transformers, inductors are available in many variations to suit different application
- Bobbin-based inductors: As suggested by the name, these inductors are wound on cylindrical bobbins. They are generally employed in printed circuit boards (PCBs).
- Toroidal inductors: These inductors have toroidal (ring- or donut-shaped) cores. They typically come at a smaller size and lighter weight – about half the weight and size of more conventional inductors – making them a great choice for smaller power supplies. Toroidal inductors offer stronger magnetic fields and lower electromagnetic interference (EMI), making them ideal for higher-frequency and lower-power applications.
- Multi-layer inductors: These inductors feature multiple winding layers, which increase inductance and capacitance capabilities. Multi-layer inductors are commonly found in DC/DC power conversion circuitry within smartphones and wearable devices, for example. The inherent structure of these inductors offers space and cost reductions for the circuit system overall
- Film inductors: These thin inductors are used for DC to DC converters in mobile electronic devices, such as smartphones.
- Variable inductors: Variable inductors allow the magnetic core to be moved, allowing the circuit to “tune” between frequencies.
Inductor Design and Selection Considerations
When designing and selecting an inductor, industry professionals rely on some of the same considerations as those for transformers, such as winding design, size, and material. Other factors to keep in mind include series resistance and interference from other devices, both of which may cause operational issues if left unaccounted.
Chokes
Chokes consist of insulated wire coiled around a magnetic core. They are a type of specialized inductor designed to block high-frequency alternating current (AC) while allowing low-frequency direct current (DC) to pass through unhindered, minimizing the risk of noise interfering with system performance.
Types of Chokes
Chokes are available in two variations
Common Mode Choke: These chokes feature two or more coils on a single magnetic core, with each winding positioned in series with the conductors. They are effective at blocking noise in applications involving two conductors with currents that are equal but flowing in opposite directions.
Differential mode chokes: These chokes operate similarly to common-mode chokes but generate flux in the opposite direction to cancel the noise-causing current. They are ideal for use in applications that require noise filtration from a single conductor.
Chokes Design and Selection Considerations
When designing and selecting a choke, key considerations include impedance, frequency, and current requirements. These factors influence the optimal winding design, core, winding, and insulation materials, and mounting method for a given application.
We Have a lot to learns about the Magnetic Components in the above I have shared the Common Terminological brief Explanation, Now let's Explore The Magnetic Component Kit.
All the components are placed in a container
Experimenting with Magnetic Components Kit Unboxing Video
In the Kit, I Have Received
- Line Filter
- RF Chokes
- High Current Choke
- Normal Inductors
- Common-mode Chokes
- Pulse Transformers
- Chokes With Mili HENRY Values
Let's Go through The Brief Explanation of Components
Line Filter: An internally or externally mounted low-pass or band-reject filter at the power supply input which reduces the noise fed into the power supply.
The two primary functions of the input line filter are:
- Preventing the EMI signals generated within the power supply from reaching the input ac power line and affecting other equipment connected on the same line.
- Preventing high-frequency voltage and EMI on the power line from passing through and reaching the supply’s output.
RF Chokes: A Radio Frequency Choke (R.F.C.) is a basic inductor used to choke radio frequencies. This kind of inductor will allow DC current to pass through but block AC current in the radio frequency range. In other words, it chokes the radio frequency signal.
Common-mode Chokes
A common mode choke is an electrical filter that blocks high-frequency noise common to two or more data or power lines while allowing the desired DC or low-frequency signal to pass. Common mode (CM) noise current is typically radiated from sources such as unwanted radio signals, unshielded electronics, inverters and motors. Left unfiltered, this noise presents interference problems in electronics and electrical circuits.
Pulse Transformers
Pulse transformers are a diverse family of transformers designed to transfer a digital control signal from a control circuit to a load. They provide galvanic isolation to a circuit, whilst allowing fast control signals to be transmitted without distorting the signal shape. The input and output signal is typically a rectangular wave of a few volts with a frequency above 100Khz, not a sinusoidal wave as with conventional transformers
In the Next Blog, I will share the experiment details along with the results and calculations.