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Traditional Switching Power Magnetic Components Magnetic components is one of the key components in power supply. Magason has strong R&D team and can provide many kinds of magnetic components. All design and materials selection are safety and reliable. High-frequency electronic transformer Design Power: 1-10KW Model: EE,EI, ER, ETD, EPC, EP, POT, PQ, RM, CD, UU, UR etc Operation Frequency: 10~500KHz Application: Switching power supply, network communications, UPS, Photovoltaic inverter, automative electronics, instruments and meters --------------------------- Filter(Toroidal Inductor) Models: EE,EI, ER, ETD, EPC, EP, POT, PQ, RM,UU,DR,RR,TOROID etc Category: smoothing choke, CM Choke,PFC Choke,Resonate Choke etc Material: Ferrite, Iron Powder, Sendust, MPP, HI-FLUX, Fe-Si, Amorphous, etc Application: Switching power supply, network communications, frequency converter, LED, UPS, photovoltaic inverter, automotive electronics, instruments and meters, electronic appliances etc --------------- Edit by Lareina sales04@magason-tech.com

Power Line Filters Inductor Applications: TV set, recorder, sound-frequency equipment, show-scope, photocopy-scope, typewrite equipment, recreation-scope, computer ect.; For Line filters of switching power supplies; Elimates incoming/leaking noise of TVs, VTRs/VCRs and audio equipment; For OA equipment, communications equipment and other electronic devices.

High Frequency High Power Nanocrystalline Toroidal Core Nanocrystalline Core for transformer features high saturation flux density, high permeability, low loss, low coercivity, working frequency between 1-100khz. Widely used in medium frequency inductive heating power supply, electroplating power supply, inverter welding machine, pulse transformer, ups, smps power transformers. ---------------------- edit by lareina sales04@magason-tech.com

Dip Inductor Feature: Low DC Resistance; High Magnetic Saturantion; Customized Design is Available; Maximum Operating Temperature Up to 125℃. Specification: 1. Inductance measure condition at 1kHz, 0.25V; 2. D.C. resistance measures by 502BC Ohm-meter at 25℃; 3. Saturation current: the actual value of DC current when the inductance decrease 20% if its initial value; 4. Temperature rise current: the actual value of DC current when the core surface temperature rise is T40℃(Ta=25℃). --------------------------------- Edit by Lareina sales04@magason-tech.com Skype: lareinaW5371

POT CORE POT Cores offer the benefit of lowest leakage inductance and high Q. They provide perfect isolation from stray magnetic fields and are built with temperature stable inductance. These cores have a complicated gapping process to maintain AL value. They are available in a variety of sizes such as P0903, P1408, P1811, P2213, P2616, P3019, P3019A, P3422H, and P3622. Common applications for Pot cores are broadband and narrow transformers and telecom inductors, power transformers, and power inductors. ----------------- Edit by Fiona sales05@magason-tech.com

The Air Core Inductor You Want! In alternating electrical circuits, the voltage changes polarity up to 60 times per second with each terminal changing from positive to negative and back again. Normally, such rapid changes in voltage would produce power fluctuations. An inductor is a component that produces an electromagnetic field in response to electrical current flowing through a coiled wire. The strength of an inductor depends on the current being applied, the core of the inductor, and the number of turns in the wire coil forming the inductor. An air core inductor is a wire coil with no solid core inside the coil. Air has a low electrical conductivity, and so produces the weakest of all magnetic fields in opposition to current flow. One of the biggest advantages of an air core inductor is the minimal signal loss that occurs at higher magnetic field strengths. With ferromagnetic cores such as iron, the core can become magnetically saturated when the magnetic field is too strong. This leads to a loss in inductance, but an air core inductor has no such problem. An air core inductor can carry electromagnetic frequencies up to 1 GHz, but ferromagnetic core inductors tend to experience loss when the frequency exceeds 100 MHz. Applications: • Satellite communication systems. • Microwave equipment. • Television Circuits. • AM/FM radio receivers/transmitters. • Test equipment. • Band pass filters. Edit&Sales: Fiona SHAANXI MAGASON-TECH ELECTRONICS CO.,LTD Email: sales05@magason-tech.com

Excellent High Frequency Transformer ---Edit Lareina Features ·Horizontal installation,multi out-put applied in denseness installation; ·For driver transformer,main transformer and smoothing choke; ·For general purpose use. -------------------------------------------------- Features: ·Designed in the fittest shape,applied in the range of power:(5W-1KW) 100KHz,cut down installation cubage woth multi-plugs and bobbins easily wore connection to meet the request; ·For driver transformer,main transformer and smoothing choke; ·Low leakage. --------------------------------------------------- Features ·Possessing of high permeability, high saturation flux density and low loss. Especially about at100℃the power loss goes bottom; ·For driver transformer,main transformer and smoothing choke; ·For general purpose use. ---------------------------------------------------- Features: ·Designed in the fittest shape,applied in the power:(50W-1KW)100KHz,cut down installation cubage with multi-pluge and boobins,easily wire connection to meet the request; ·For driver transformer,main transformer and smoothing choke; ·Low leakage. ------------------------- Email: sales04@magason-tech.com Skype: lareinaW5371

Magason Powder Core Powder core applied in EV/HVE, fully exert its advantages of high efficiency. Small size and low noise. Magason can not only make custom designs, but also develop new solutions with customers. Edit&Sales: Lareina SHAANXI MAGASON-TECH ELECTRONICS CO.,LTD Email: sales04@magason-tech.com

Toroidal Vertical Inductor From Magason Toroidal Inductors(common mode choke) are used for applications that include current sense transformers, common mode inductors, switching regulator inductors, input filter inductors, and more. These inductors provide excellent value - they are generally smaller in size and cost less than other inductors. Edit Lareina http://www.magason-tech.com/ info@magason-tech.com

Encapsulated Transformers are simply transformers in which one or more of the transformer's components are completely sealed. One example of a component is the encapsulated transformer's coils. This process of encapsulation protects the transformer from dirt, dust, moisture, and any other contaminants. Magason Encapsulated Transformers has high water-proof and dust-proof performance. Suitable for out door use, with easyinstallation, stable performance, strong consistency, simple structure suitable for automatic production. Edit Lareina http://www.magason-tech.com/ info@magason-tech.com

Blue Powder Core FEATURES Distributed air gap High saturation flux density(1.0T) Ultra-low core loss Near zero magnetostriction Excellent temperature frequency Stability Blue Powder Core APPLICATIONS PV inverter Server power supply New energy vehicle DC charging pile Air conditioner -------------------------------------------------------- Black Powder Core FEATURES Iron, silicon, aluminum alloy powder Good core loss High saturation flux density (.0T) Good DC bias performance Low magnetostriction Good temperature stabilization Black Powder Core APPLICATIONS PFC choke for server power supply Switching regulator inductor Boost choke for PV inverter Output choke for general industrial power supply ------------------------------------------------------- Green Powder Core FEATURES Lower losses than iron cores High saturation flux density(1.3T) Good DC bias performance Cost effective Green Powder Core APPLICATIONS PFC choke for UPS INV choke for UPS PV inverter Edit Lareina http://www.magason-tech.com/ info@magason-tech.com

High Frequency Transformer EE, EI series: Features: 1. Possessing of high permeability, high saturation flux density and low loss. Especially about at 100C the power loss goes bottom; 2. For driver transformer, main transformer and smoothing choke; 3. For general purpose use. High Frequency Transformer RM series: Features: 1. Designed in the fittest shape, applied in the range of power: (5W-1KW) 100KHz, cut down installation cubage woth multi-plugs and bobbins easily wore connection to meet the request. 2. For driver transformer, main transformer and smoothing choke. 3. Low leakage. High Frequency Transformer EFD series: Features: 1. Horizontal installation, multi out-put applied in denseness installation. 2. For driver transformer, main transformer and smoothing choke. 3. For general purpose use. ------------------------------- Edit Lareina http://www.magason-tech.com/ info@magason-tech.com

SHAANXI MAGASON-TECH ELECTRONICS CO.,LTD is a high-tech enterprise in China. After years of developing. Magason has fully mastered core technology and intellectual property rights of the whole production system of powder core. such as R&D, production, insulation and forming. By integrating in-depth research of powder core material characteristics, we already have deep cooperation with well-known enterprises in electrical energy conversion industry. Now Magason has built up a fully comprehensive service platform ranging from alloy powder to powder core forming. application design of magnetic component, aiming to help our customers optimize magnetic component solutions in cost, efficiency and size. Distributed air gap is the most significant advantage and ensures low core loss for high frequency applications All the core series are the best choices for DC-DC, PFC and INV chokes. FEATURES Distributed air gap; High saturation flux density(0.95T); Ultra-low core loss; Near zero magnetostriction; Excellent temperature frequency stability; APPLICATION Resonant Inductor (<150KHz); PFC Inductor(150~500kHz); Fly-back Transformer. ------------------------------------------------------ Edit by Lareina SHAANXI MAGASON-TECH ELECTRONICS CO.,LTD info@magason-tech.com http://www.magason-tech.com/

Air core inductors do not rely on a magnetic core and are made from a ferromagnetic material. In most cases, the coils are wound on ceramic, plastic, or other nonmagnetic forms in addition to those that possess air within the winding. Common features of air core inductors include lower inductance than standard ferromagnetic core coils, and they are often used at high frequencies because of their ability to remain free from energy losses. Air core inductors are one of the largest and heaviest components of the DC-DC converter in medium/high power applications. As volume/weight of the converter becomes more important, high frequency is considered in the design of the converter and air core inductors with low inductance and high currents are required. Air core inductors can be considered as good alternative, since they are not subject to saturation problems and may provide a reduction on total weight and losses of the converter if an appropriated design is performed. Features: 1.Higher frequency,lower wastage 2.High rated current and low DCR, the current can be reached 150A 3.Flat bottom surface,reliable installation. 4.Magnetic shielded,not easy affect by temperature. 5.Lead free products, RoHS compliant. Factory direct price Application: Widely use in LED lights, Adaptors, Electrical ballast, Dimmers, Switching power supplies, Electric appliances, Digital VCR/LCD converter, DC-DC converter We are professional supplier for quality and customer-made ferrite rod inductor. More details, please visit https://www.magason-tech.com/ Edit&Sales: Lareina Email: sales04@magason-tech.com

A common mode choke is used to cancel the noise of various electronic devices and it is a components designed to improve energy efficiency. To realize the high performance of electronic equipment and energy saving contribution, common mode choke matters a lot. It 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. Let's check the common mode choke's good performance here. Specifications: Designed to customer requirements Product Types: EMI/EMC inductor,PFC inductor, choke inductor, filter inductor, power inductor Insulation Class: Class(130C), Class F(155C), Class(180C), Class N (200℃), Class R(220℃), Class(240℃, Class C(>240℃) Power Range: 1KW-100KW Applications: PV inverter, Energy storage device, Medium or big power UPS, Charging pile, Variable frequency air conditioner, Server power supply, Big power supply for rail traffic Aeronautics and astronautics. COMMON MODE CHOKE FEATURES: 1.Because the iron loss is very low, it is beneficial to the power efficiency of bill of lading PFC etc; 2.Because of the use of small magnetic skew number of materials, conducive to the corresponding noise problems; COMMON MODE CHOKE APPLICATIONS: 1>Smooth the output of the switching power supply; 2>For the corresponding high harmonic active filter; 3>Used for DC-DC converter; 4>For non - common-mode line filters; 5>Used for noise prevention of TV, stereo, etc; To check and get more information, please visit: http://www.magason-tech.com Edit&Sales: Lareina SHAANXI MAGASON-TECH ELECTRONICS CO.,LTD Email: sales04@magason-tech.com

Has a new inquiry recently? Magason can offer some free samples for your testing . Our company mainly do transformers, inductors, chokes and current sensors. To be specialized manufaturer, Magason can offer you good quality products in more reasonable price. Please can you check if you have any inquiry related? Any question, contact me directly~ For easy communication : Please add me to chat: Skype: live:4581f17d0da64371 or whatsapp: 17792322498

Designing magnetic components for SMPS can be challenging because the increasing demands of modern electronics designs. Following these 12 point can help engineers navigate the challenges and ensure a successful project. The following parameters are essential for designing SMPS magnetic components: In order to calculate a high frequency transformer, electrical engineers: 1. Choose an appropriate core. 2. Calculate the primary turns needed, based on the flux density the engineer chooses to operate. 3. Calculate the number of secondary turns, which is represented by the ratio of primary to secondary voltage. 1: Core Choice Make your preliminary core choice based upon the power requirements of the application, the switching topology, and the frequency. Ferrite cores are the best choice for high-frequency applications. For operation below 500 KHz, most designers will use a core material with a permeability of 2000 to 2500. Permeability varies significantly with temperature rise and operating flux density. In general, this will not affect operation of the converter as long as the core is not close to saturation as the inductance (which controls the mode of operation) is primarily determined by the air gap. However, temperature rise, and operating flux density will affect core losses, and this must be taken into account to ensure reliable operation. Core Shape transformer-cores The core shape and window configuration are important for high-frequency transformer design to minimize losses. The winding window area should be as wide as possible to maximize winding breadth and minimize the number of layers. This minimizes AC winding resistance. EFD and EPC cores are used when a low profile is required. EE and EF are good choices and generally used with either vertical or horizontal bobbins (vertical bobbins are good when footprint space is at a premium). ETD and EER cores are usually larger, but have a wide winding area, which makes them particularly good for higher power designs and multiple output designs. PQ cores are more expensive but take up slightly less PC board space and require less turns than E cores. Larger core size will be needed for a margin wound type transformer than for a triple insulated type to allow room for the margins. Core Size There are many variables involved in estimating the appropriate core size. One way to select the proper core is to refer to the manufacture`s core selection guide. The core area product (WaAc), obtained by multiplying the core cross-section area by window area available for winding is widely used for an initial estimate of core size for a given application. Core Power handling capability does not scale linearly with area product or core volume. A larger transformer must operate at a lower power density because the surface area dissipating heat does not increase in proportion to the volume producing the heat. The table below gives an overview of core types as a function of power throughput: square-wave-bipolar-flux The WaAc / power output relationship is obtained by: Steps for Designing SMPS Transformers power-output-relationship-equation Kf = Form factor; for square wave Kf = 4 Ku = Window utilization factor J = Current density Bmax = Operating flux density F = Switching frequency Po = Output power 2: Volt-Time Product (V-µSec) Value Determine the V-T value based upon the maximum allowable duty cycle and the frequency Steps for Designing SMPS Transformers volt-time-product-equation 3: Primary Turns Determine the minimum number of primary turns required to support the worst case V-T value. Steps for Designing SMPS Transformers primary-turns-equation Note : B < 0.3T for ferrite 4: Turns Ratio Calculate the secondary/primary turns ratio Isolated Topology Secondary / Primary Turns Ratio Flyback Forward Push-Pull Half-Bridge Full-Bridge Note: Diode drop Vd = 0.5-1V 5: Secondary Turns Choose the exact primary and secondary turn counts to be used based upon the Np and Ns/Np. 6: Primary Inductance Calculate the required primary inductance: Steps for Designing SMPS Transformers primary-inductance-equation The table below shows typical efficiency figures: Topology Efficiency Range (η) Flyback > 70% Forward > 85% Push-Pull > 90% Half-Bridge > 90% Full-Bridge > 90% 7: Air Gap The smallest size and lowest cost transformer is achieved by fully utilizing the core. In a specific application, optimum core utilization is associated with a specific optimum core gap length. The core gap will be determined by the number of primary turns and the inductance specification. The designer will verify that the gap is sufficient to prevent core saturation. Steps for Designing SMPS Transformers design-airgap-equation-1 Steps for Designing SMPS Transformers design-airgap-equation-2 Note: Push-pull, forward, half-bridge, and full bridge converter topologies typically do not require an air gap, since it is actually true transformer action. 8: Wire Size Once all the winding turns are determined, the wire size should be properly chosen to minimize the winding conduction loss and leakage inductance. The winding loss depends on the RMS current value, the length and the width of wire, also the transformer structure. The wire size could be determined by the RMS current of the winding. Winding loss is a function of the amount of resistance in the wire. The resistance is composed of DC resistance and AC Resistance. At low frequencies, RDC >> RAC, RAC can effectively be ignored. At high frequencies, it may be necessary to use stranded/Litz wire or foil to minimize AC resistance. Due to the skin effect and proximity effect of the conductor, the diameter of the wire/strand should be less than 2*Δd (Δd = skin effect depth) Assume current density is typically 3–6 A/mm2. Step 9: Fill Factor The fill factor means the winding area to the whole window area of the core (should be < 1). For initial designs, it is recommended that a fill factor no greater than about 50% to be used. For transformers of high power density and multiple outputs, this factor may need to be reduced further. After the wire sizes have been determined, it is necessary to check whether the window area with the selected core can accommodate the windings calculated. The window area required by each winding should be calculated respectively and added together, the area for inter-winding insulation, bobbin, and spaces existing between the turns should also be taken into consideration. Based on these considerations, the total required window area is then compared to the available window area of a selected core. If the required window area is larger than the selected one, either the wire size must be reduced, or a larger core must be chosen. Of course, reduction in wire size increases the copper loss of the transformer. Step 10: Core Loss In a transformer, core loss is a function of the voltage applied across the primary winding. In an inductor, it is a function of the varying current applied through the inductor. In either case, the operating flux density level needs to be determined to estimate the core loss. With the frequency and B level known, core loss can be estimated from the material core loss curves. 11: Copper Loss In a transformer, copper loss is a function of AC and DC resistances. 12: Temperature Rise Temperature rise is important for overall circuit reliability. Staying below a given temperature ensures that wire insulation is valid, that nearby active components do not go beyond their rated temperature, and overall temperature requirements are met. Thermal runaway can occur causing the core to heat up to its Curie temperature resulting in a loss of all magnetic properties and catastrophic failure. Total loss is measured in watts and surface area is in cm2. Steps for Designing SMPS Transformers temp-rise-equation Transformer Construction Transformer construction has a large effect on the leakage inductance of the primary winding. Leakage inductance leads to a voltage spike at turn off of the semiconductor switch, so minimizing the leakage inductance will result in a lower voltage spike and lower or even no requirement for the snubber circuit on the primary. The following techniques are used to minimize leakage inductance: Transformer windings should always be concentric i.e. on top of each other to maximize the coupling, for this reason, split and multi-section bobbins should not be used. Use of a split primary winding, where the first layer of the winding is the inner-most winding and the second layer is wound on the outside. In a multiple output transformer, the secondary with the highest output power should be placed closest to the primary for the best coupling and lowest leakage. Secondary windings with only a few turns should be spaced across the width of the bobbin window instead of being bunched together in order to maximize coupling to the primary. Using multiple parallel strands of wire is an additional technique of increasing the fill factor and coupling of a winding with few turns To minimize leakage inductance and still meet isolation requirements, design the windings using triple insulated wires and minimal tape layers. Steps for Designing SMPS Transformers transformer-wiring-construction-1 Steps for Designing SMPS Transformers transformer-wiring-construction-2 Margin wound construction or triple insulated wire construction is used to meet international safety standards. Steps for Designing SMPS Transformers transformer-wiring-construction-3 Steps for Designing SMPS Transformers transformer-wiring-construction-4 Transformer shielding: Using a flux band (copper shield) around the entire transformer will provide a circumferential radiation shield for the eddy currents in the transformer. This shield is simply a grounded loop of copper foil around the entire assembly. Use of this technique requires careful consideration of isolation requirements and creepage and clearance issues. A Wide Array of Advanced Applications High-frequency transformers are used for a wide range of advanced applications both large and small-from powering personal computers to providing electricity to homes and commercial property. The product can also be used for: • Alternative energy inverters • Electronic switching devices • Military Power Supplies • LED Lighting • Plasma Generation • Personal electronics

How to caculate the inductance?