In the realm of electronics, ensuring stable and noise-free power is paramount. Converters play a crucial role in managing power from various sources, including the grid. This guide focuses on the critical aspect of DC-DC converter design – the selection of the right inductor. Understanding the role of inductors and making informed choices can significantly impact the efficiency and reliability of your power conversion systems.

The Role of Inductors in DC-DC Converters: Inductors in the output stage of DC-DC converters are vital for voltage regulation, ensuring the output voltage remains at a desired value despite input fluctuations. Different topologies require inductors to perform specific functions, whether stepping up or stepping down the voltage. We will explore the significance of inductor selection across various converter topologies.

Key Considerations for Inductor Selection

Selecting the Right Inductor: Choosing an inductor involves several critical parameters, including current rating, coil resistance, and saturation current. The goal is to minimize power loss while ensuring the inductor can handle the maximum current without saturation. Additionally, the inductance value and its behavior at different frequencies are essential factors, especially in systems utilizing PWM signals at high frequencies.

DC-DC Converter Topologies and Inductor Functions: Inductors serve dual purposes in buck, boost, and Cuk converter topologies: energy storage during switching and ripple reduction on the output. The choice of inductor value is pivotal in determining the converter’s performance, affecting ripple current and the efficiency of power transfer.

Advanced Converter Topologies – LLC Resonant Converters

LLC Resonant Converters: LLC resonant converters utilize a combination of inductors and transformers to achieve voltage regulation through resonance. Selecting the correct inductance and capacitance values is critical for operating near the resonance frequency, allowing for efficient power conversion with minimal losses.

The selection of inductors for DC-DC converters is a nuanced process that significantly affects the performance and efficiency of power conversion systems. By understanding the requirements of different converter topologies and considering key parameters, designers can ensure optimal converter functionality.

The post DC-DC Converter Inductor Selection Guidelines for High Power Systems first appeared on BaoHui Tech.

Key Specifications/Special Features:

1. High efficiency

2. High power

3. High current

4. Low power loss

5. Low temperature rise

6. High temperature grades are available

7. RoHS Directive-compliant

8. UL insulation systems are available

9. Customized designs are accepted

10. OEM orders are welcome

Reasons of our top-quality components help your business succeed:

1. 20 years of experience customizing and power transformers and inductors

2. Your professional and reliable partner for various electronics

3. Over 1000 buyers value our products

4. 50000m2 factory with 4 production bases and 400 employees

The post EMI Through-Hole Coil High Current Toroidal Coils Inductor first appeared on BaoHui Tech.

Table 1: Top Featured Manufacturers and Suppliers of Transformers in the USA

Top Featured Manufacturers and Suppliers of Transformers on Thomas—Company Summaries

MPS Industries, Inc. is an ISO-certified company offering magnetic components. The company’s product line includes audio, current sense, isolation, power, RF, balun, video, and telecom transformers. MPS Industries also offers custom transformer designs.

Triad Magnetics is a custom manufacturer of power, current sense, audio, and wall plug-in transformers. The company meets the demand for renewable energy, medical, power conversion, audio or sound processing, and food & beverage industries.

Lenco Electronics, Inc. designs and manufactures audio, switch mode, plate, medical, converter, PCB, filament, control, inverter, low profile, constant voltage, auto, 3-phase, and buck-boost transformers. The company is located in McHenry, IL.

TTI Inc. is a distributor that provides electronic transformers of various termination styles, operating temperatures, voltages, currents, and frequencies. It also offers marking, labeling, packaging, and documentation services. The company has its headquarters located in Fort Worth, TX, and has been in business since 1971.

Endicott Coil Co, Inc. has been the source of magnetic components to medical, aerospace, and military markets for over 65 years. Power, isolation, current, step-up, step-down, flyback, and autotransformers are offered by the company.

Founded in 1967, Pico Electronics, Inc. is a provider of audio, interface, power, and pulse transformers. The manufacturer is based in Pelham, NY.

Headquartered in Cary, IL, Coilcraft, Inc.  has been a leader in the design, manufacture, and distribution of high-performance magnetic components including transformers. Power, compact, PoE, current sense, gate drive, ultrasonic sensing, isolation, data, capacitor charging and CCFL transformers are offered by the company.

Advance Electrical & Automation is a distributor that provides transformers of various types including enclosed electrical, isolation, and control. It also offers UPS, power supplies, and power conditioners. The company has its headquarters located in Lake Elsinore, CA, and has been in business since 1980.

Tri-State Armature & Electrical Works, Inc. is a distributor that supplies the paper, pulp, chemical, plastics, steel, rubber, and food processing industries with transformers, as well as 24-hour emergency services. The company has its headquarters located in Memphis, TN, and has been in business since 1920.

Compressed Air Systems, Inc. is a distributor that, as the name suggests, specializes in the distribution of compressed air systems. It also offers adapters, abrasives, air guns, analyzers, blowers, air compressors, coolers, detectors, drains, dryers, and more. The company is headquartered in Tampa, FL, and has been in business since 1963.

Leading manufacturer in the China

Looking for top-quality transformer supplier in China, please contact Baohui Tech, the leading manufacturer of various types transformers including enclosed electrical, isolation, and control. It also offers UPS, inverter, inductor. The company has its headquarters located in Shenzhen, China, and has been in business since 2006.

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什么是专精特新中小企业？

专精特新中小企业是指具有“专业化、精细化、特色化、新颖化”特征的中小企业，是优秀中小企业的中坚力量。

1. “专” 即专业化与专项技术。
2. “精” 即产品的精致性、工艺技术的精深性和企业的精细化管理。
3. “特” 即产品或服务的独特性与特色化。
4. “新” 即自主创新、模式创新与新颖化。

宝晖科技本次荣获深圳市“专精特新中小企业”认定，是在科技创新领域获得的殊荣，是深圳市政府对宝晖科技研发能力、产品创新能力以及企业综合实力的权威认可与肯定。
这不仅仅是一种荣誉，更是一种催人奋进的动力。未来宝晖将持续加大研发投入，提升企业自主创新能力，做精做强细分市场，深耕磁性电子元器件领域，持续推动产业创新、绿色、高质量发展。

创新是企业发展的“命脉”。宝晖科技作为“国家高新技术企业”和“专精特新中小企业”，坚持自主创新与开放式创新相结合，不断加大研发投入，已经获取专利超过30项。

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A common need for filter circuits is in high-performance stereo systems, where certain ranges of audio frequencies need to be amplified or suppressed for best sound quality and power efficiency.

You may be familiar with equalizers, which allow the amplitudes of several frequency ranges to be adjusted to suit the listener’s taste and acoustic properties of the listening area.

You may also be familiar with crossover networks, which block certain ranges of frequencies from reaching speakers.

A tweeter (high-frequency speaker) is inefficient at reproducing low-frequency signals such as drum beats, so a crossover circuit is connected between the tweeter and the stereo’s output terminals to block low-frequency signals, only passing high-frequency signals to the speaker’s connection terminals.

This gives better audio system efficiency and thus better performance. Both equalizers and crossover networks are examples of filters, designed to accomplish filtering of certain frequencies.

Another practical application of filter circuits is in the “conditioning” of non-sinusoidal voltage waveforms in power circuits.

Some electronic devices are sensitive to the presence of harmonics in the power supply voltage, and so require power conditioning for proper operation.

If a distorted sine-wave voltage behaves like a series of harmonic waveforms added to the fundamental frequency, then it should be possible to construct a filter circuit that only allows the fundamental waveform frequency to pass through, blocking all (higher-frequency) harmonics.

We will be studying the design of several elementary filter circuits in this lesson. To reduce the load of math on the reader, I will make extensive use of SPICE as an analysis tool, displaying Bode plots (amplitude versus frequency) for the various kinds of filters.

Bear in mind, though, that these circuits can be analyzed over several points of frequency by repeated series-parallel analysis, much like the previous example with two sources (60 and 90 Hz), if the student is willing to invest a lot of time working and re-working circuit calculations for each frequency.

A filter allows you to remove unwanted frequencies and also allows you to boost certain frequencies. Which frequencies are removed and which frequencies are left depends on the type of filter you use.

Cut-off frequency

This is the point (frequency) at which the filter begins to filter (block or cut out). The filter will lower the volume of the frequencies above or below the cut-off frequency depending on the type of filter used.

This ‘lowering of the volume of the frequencies,’ is called Attenuation. In the case of a low pass filter, the frequencies above the cut off are attenuated. In the case of a high pass filter, the frequencies below the cut off are attenuated. Put simply: in the case of a low pass filter, we are trying to block the (higher) frequencies above a certain point and allow the lower frequencies through. In the case of a high pass filter, the opposite is true. We try to cut out or block frequencies below a certain point and allow the higher frequencies through.

Analogues use circuitry and for that reason alone, it takes time for the filter to attenuate frequencies, in proportion to the distance from the cut-off point. Today’s technology allows for instant cut-off as the filter attenuation is determined by algorithms as opposed to circuits. That is why the filters of an Arp or Oscar etc, are so much more expressive and warm as they rely completely on the resistors and capacitors to first warm up, then to work but in a gradual mode(gradual meaning sloped or curved as opposed to instant). Depending on how well a filter attenuates or the way it attenuates gives us an idea of the type of sound we will achieve with an analogue filter.

Slope/Gradient

The speed at which the filter attenuates is called the slope or gradient. Another point to raise now is that you will often see values on the filter knobs on analogue synthesizers that have 12 dB or 24 dB per octave. That basically means that each time the frequency doubles, the filter attenuates by 12 dB or 24 dB everything at that frequency. These are also known as 2 pole or 4 pole filters, each pole represents 6 dB of attenuation. This is how analogue circuits were built, the number of circuits being used by the filter to perform the task at hand.

Resonance

Most synthesizer manufacturers, and in the case of most analogue synthesizers, the term resonance is used most commonly. Other manufacturers of synthesizers, or software synthesizers, might call it emphasis or Q.

The post Filter first appeared on BaoHui Tech.

An inverter converts the DC voltage to an AC voltage. In most cases, the input DC voltage is usually lower while the output AC is equal to the grid supply voltage of either 120 volts, or 240 Volts depending on the country.

The inverter may be built as standalone equipment for applications such as solar power, or to work as a backup power supply from batteries which are charged separately.

The other configuration is when it is a part of a bigger circuit such as a power supply unit, or a UPS. In this case, the inverter input DC is from the rectified mains AC in the PSU, while from either the rectified AC in the in the UPS when there is power, and from the batteries whenever there is a power failure.

There are different types of inverters based on the shape of the switching waveform. These have varying circuit configurations, efficiencies, advantages and disadvantages

An inverter provides an ac voltage from dc power sources and is useful in powering electronics and electrical equipment rated at the ac mains voltage. In addition they are widely used in the switched mode power supplies inverting stages. The circuits are classified according the switching technology and switch type, the waveform, the frequency and output waveform.

Basic inverter operation

The basic circuits include an oscillator, control circuit, drive circuit for the power devices, switching devices, and a transformer.

The conversion of dc to alternating voltage is achieved by converting energy stored in the dc source such as the battery, or from a rectifier output, into an alternating voltage. This is done using switching devices which are continuously turned on and off, and then stepping up using the transformer. Although there are some configurations which do not use a transformer, these are not widely used.

The DC input voltage is switched on and off by the power devices such as MOSFETs or power transistors and the pulses fed to the primary side of the transformer. The varying voltage in the primary induces an alternating voltage at secondary winding. The transformer also works as an amplifier where it increases the output voltage at a ratio determined by the turn’s ratio. In most cases the output voltage is raised from the standard 12 volts supplied by the batteries to either 120 Volts or 240 volts AC.

The three commonly used Inverter output stages are, a push-pull with centre tap transformer, push-pull half-bridge, or push-pull full bridge. The push pull with centre tap is most popular due to its simplicity and, guaranteed results; however, it uses a heavier transformer and has a lower efficiency.

A simple push pull DC to AC inverter with centre tap transformer circuit is a shown in the figure below.

Figure 1 basic inverter switching circuit

Inverter output waveforms

The inverters are classified according to their output waveforms with the three common types being the square wave, the pure sine wave and the modified sine wave.

The square wave is simple and cheaper, however, it has a low power quality compared to the other two. The modified square wave provides a better power quality (THD~ 45%) and is suitable for most electronic equipment. These have rectangular pulses that have dead spots between the positive half cycle and the negative half cycle (THD about 24%).

Figure 2: Modified sine waveform

The true sine wave inverter has the best waveform with the lowest THD of about 3%. However, It is the most expensive and used in applications such as medical equipment, stereos, laser printers and other applications requiring sinusoidal waveforms. These are also used in the grid ties inverters and grid connected equipment

Figure 3: Pure Sine wave

Applications

Inverters are used for a variety of applications that range from small car adapters to household or office applications, and large grid systems.

• Uninterruptible power supplies
• As standalone inverters
• In solar power systems
• As a building block of a switched mode power supply

Benefits

1. Energy-saving

Fan and pump applications benefit significantly from AC drives. Superior to dampers and on/off controls, using AC drives can reduce energy consumption by 20 to 50 percent by controlling motor rotation. It is similar to reducing the speed of a car. Instead of using breaks, the speed of the car can be reduced by lightly pressing on the accelerator.

2. Soft Starters

An AC Drive starts the motor by delivering power at a low frequency. It gradually increases the frequency and motor speed until the desired speed is met. Operators can set the acceleration and deceleration at any time, which is ideal for escalators and conveyor belts to avoid dropouts of loads.

3. Controlled Starting Current

It takes seven to eight times of the AC motor’s full-load current to start the motor. The AC drive reduces the starting current, resulting in fewer motor rewinds, and this extends motor life.

4. Reduced Power Line Disturbances

Starting an AC motor across the line can place an enormous drain in the power distribution system, causing a voltage sag. Sensitive equipment such as computers and sensors will trip when a large motor starts. The AC drive eliminates this voltage sag by removing the power from the motor instead of tripping.

5. Easily Changes the Direction of Rotation

AC drives can handle frequent start and stop operations. It only needs a small current to change the direction of rotation after changing the rotation command. Stand mixers can produce the right output as the direction of rotation, and the number of revolutions can be controlled with an inverter drive

6. Simple Installation

AC drives are pre-programmed. Control power of auxiliaries, communication lines, and motor leads are already factory wired. The contractor only needs to connect the line to the power source that will supply the AC drive.

7. Adjustable Torque Limit

AC Drives can protect motors from damage by accurately controlling the torque. For example, in a machine jam, the motor will continue to rotate until the overload device opens. An AC drive can be set to limit the amount of torque applied to the motor to avoid exceeding the torque limit.

8. Elimination of Mechanical Drive Components

An AC drive can deliver low or high-speed required by the load without speed-increasing or reduction devices and gearboxes. This saves maintenance costs and floor-space requirements.

The post Inverter first appeared on BaoHui Tech.

Signal transformers are used in measurement systems to detect interferences e.g. short circuits and lightning, for matching and compensating circuits, for communication, and for transistor gate circuits.

Typical parameters:

• Primary voltage: ≤ 50 V
• Secondary voltage: ≤ 50 V
• Insulation strength: ≥ 1,500 V
• Ratio
• Insulation class: B, F, or H
• Protection rating: ND
• Frequency > 100 kHz
• Resistance to partial discharge

Components for surface mounting or through-hole mounting, also in impregnated or cast in housing versions.

Read more

Single Isolation transformer（BKDC)

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PFC Inductor | 0.2kVA~1000kVA

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Vertical Nanocrystalline Alloy Core Common Mode HF Power Inductors

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Inverter and Boost Inductors | the photovoltaic (PV) power systems transformer

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Transformers of this type are used in high-frequency intermediary systems where galvanic isolation of circuits and/or a large difference of the processed voltages are required, e.g. in railway converters or car chargers. Due to their high operating frequency, they allow for miniaturization of the energy converter.

Typical operating systems for high-frequency transformers are hard commutation resonant converter systems and flyback systems.

Typical parameters:

• Primary voltage: ≤ 1,500 V
• Secondary voltage: ≤ 1,500 V
• Insulation class: B, F, or H
• Protection rating: IP00-IP67 (not applicable to leads)
• Frequency > 10 kHz

Primary, secondary, double, reinforced insulation.

High-frequency transformers are manufactured with toroidal, EI, and block cores. Due to their smaller size compared to grid transformers, they are usually encased in resin to improve the cooling conditions.

Read more

Single Isolation transformer（BKDC)

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PFC Inductor | 0.2kVA~1000kVA

Read more

Vertical Nanocrystalline Alloy Core Common Mode HF Power Inductors

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Inverter and Boost Inductors | the photovoltaic (PV) power systems transformer

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EE Series feature wide rang of application, high operating frequency, wide rang of working voltage and high output power. EE series can be seen to be used in switching supplies, computers, ballasts and household electrical appliance.

Main Transformer, Driver Transformer, Auxiliary Transformer in the swiching power supplies Widely used in computer, UPS, monitor, cotor TV and different kinds of electronic devices etc

Dimension

Features

1. Operating Frequency: 30 ~ 500KHz
2. Output Power: 0.5 ~ 10w
3. Operating Temperature: -40ºC ~ +125ºC
4. Storage Temperature: -25ºC + 85ºC
5. Low-cost, all models mainly used in less demanding fields on the electromagnetic shielding power field.
6. Power frequency because of work, safety regulations and other requirements of the different temperature level will change.

Applications

– DC/DC Converter Transformer
– Current Transformer
– Switching power supply, Adapter and UPS
– Computer products
– DVD
– LED power board
– LCD TV & Monitor Displays Power Boards
– Consumer Electric Products & Battery Charger, Printers
– Specially used in switching power supply and kinds of high-frequency circuit
– Plays a role in oscillating and separating

Reasons of Baohui’s top-quality components help your business succeed:

– 22 years of experience customizing and power transformers
– Your professional and reliable partner for various electronics
– Over 1000 buyers value our products
– 20000m2 factory with 21 production lines and 800 employees
– 5 million units annual capacity
– Our Products has the UL Insulation System, Quality is guaranteed
– High quality and best services
– More models and types are available. Welcome your spec and sample to make custom-manufacturing.

Read more

Single Isolation transformer（BKDC)

Read more

PFC Inductor | 0.2kVA~1000kVA

Read more

Vertical Nanocrystalline Alloy Core Common Mode HF Power Inductors

Read more

Inverter and Boost Inductors | the photovoltaic (PV) power systems transformer

Electrical Specifications

We can design and manufacture customized part with specific requirement.

The post Introducing EE Core Type Transformer | High Frequency Transformer first appeared on BaoHui Tech.

The post What is the structure of new energy transformers in new energy products? first appeared on BaoHui Tech.