Author Archive: ruby

Трансформаторы — это электрические компоненты, которые переопределяют силовую электронику.

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С развитием и появлением Интернета вещей инженеры все чаще сталкиваются с различными вариантами топологии трансформатора в проектных продуктах на основе PoE (Power over Ethernet).
Трансформаторы — это электрические компоненты, которые переопределяют силовую электронику, особенно для PoE (Power over Ethernet). В новых проектах на основе PoE необходимо учитывать два типа топологий трансформаторов: прямоходные силовые трансформаторы и обратноходовые силовые трансформаторы.
PoE — это новый способ питания низковольтных устройств без необходимости искать розетку 120/220 В или ближайший автоматический выключатель.
Когда этот метод был представлен на первом этапе, разработчики могли генерировать только менее 5 Вт мощности через PoE. Тем не менее, теперь есть возможность создавать перспективные конструкции блоков питания с PoE мощностью до 100 Вт и более.

• Трансформаторы PoE широко используются для подачи питания и данных на устройства по одной линии электропередачи.
• Стандарты преобразователей PoE развиваются для удовлетворения более высоких требований к мощности до 90 Вт входной мощности PD.
• Трансформатор с отводом от средней точки 1:1 используется для подачи тока, а синфазная катушка индуктивности используется для фильтрации электромагнитных помех.
• Автотрансформаторы обеспечивают более эффективную изоляцию.
#электрика #электроника #интернетвещи #мода #автомобилестроение #автомобилестроение #энергетика #инженеры #безопасность #будущее #качество #дизайн
• Обеспечьте качество IATF16949 для автомобильной промышленности 0 частей на миллион
• Разработка эффективной, следуя потребностям клиентов.
• Особенности и электрические характеристики: Настроить
• Безопасность: Класс A (105 ℃), B (130 ℃), F (155 ℃), H (180 ℃)
• AEC-Q200
• Источник питания постоянного/постоянного тока
• Совместимость с микросхемами PoE
• PoE-устройства
• Блоки питания постоянного/постоянного тока
• Для микросхем PoE

The 10 Best Integrated Circuits Suppliers In Singapore

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The 10 Best Integrated Circuits Suppliers In Singapore
Ideal Tech PC Sdn Bhd
Elle Electronics Pte Ltd
Circuit Displays Pte Ltd
PIC-CONTROL Pte. Ltd
LED Electronics(s) Pte Ltd
The SAC Singapore Electronics Pte Ltd
Belden Electronic Components (S) Pte Ltd
Acumen Components Pte Ltd
Neetron Electronic Co
S&S Electronic Components Pte Ltd

Performance and specifications of insulating materials

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Insulation materials are divided into three categories:

(1) Gas: The air distance in the transformer is often used as a safety distance for insulation. The safety distance between the primary and secondary stages of a high-frequency transformer is generally 7mm.
(2) Liquid: There are two main types of motor insulation materials: mineral and synthetic insulating oil.
(3) Solid: mainly divided into organic and inorganic.
Common organic solid insulation high-frequency transformers include insulating varnish (Varnish), insulating glue (Epoxy), insulating paper (Nomex), insulating fiber (FR4), plastic (PBT, Bakelite), casing (Teflon, Thermal casing), film (PI, Mylar), adhesive tape (Mylar, Kapton, PET), etc. Inorganic solid insulation includes mica, glass, ceramics, etc.

3. Performance and specifications of insulating materials:

Insulating materials are related to safety and reliability. The main specifications of insulating materials include breakdown strength, temperature resistance, insulation resistance, voltage resistance and mechanical stress strength. Insulation materials must meet the certification of electrical insulation. Common electrical insulation systems generally refer to the combination of winding insulation materials for electrical products such as transformers, motors, and coils, such as the testing and certification services provided by UL.

(1) Breakdown strength: When the voltage strength is higher than the specification parameter value, the voltage strength that will cause insulation damage and short circuit is called the breakdown strength, and the unit is V/mm.

(2) Heat resistance: When the temperature is higher than the specification, the performance of the insulating material will be reduced. The temperature resistance of the insulating material can work for a long time at the specified temperature and ensure reliability. The heat resistance grade is divided into Y and A , E, B, F, H, N, R and other 8 grades.

• CALSS Y: temperature limit 90 ℃. Insulators such as epoxy resin adhesives or plastic particles with low melting points.

• CALSS A: temperature limit 105 ℃. Such as enameled wire, varnished cloth, lacquered wire, oily paint and other insulating materials.

• CALSS E: temperature limit 120 ℃. Such as glass cloth, oily resin paint, enameled wire and other insulating materials.

• CALSS B: temperature limit 130 ℃. Such as epoxy resin adhesive, enameled wire, three-layer insulated wire, plastic pellets, insulating tape and other insulating materials.

• CALSS F: temperature limit 155 ℃. Such as epoxy resin adhesive, glass fiber, plastic pellets, insulating tape, enameled wire, three-layer insulated wire.

• CLASS H: The temperature limit is 180℃, such as epoxy resin adhesive, glass fiber, plastic pellets, insulating tape, enameled wire, three-layer insulated wire, motor wire, flat wire.

• CLASS N : The temperature limit is 200℃.

• CLASS R : The temperature limit is 220℃.
(3) Insulation resistance: The resistance value of the insulating material is the insulation resistance, and the unit is Ω. The resistivity of the insulating material is generally greater than 1010Ω·m, and the insulation resistance will vary due to the difference in the ambient temperature and surface condition of the insulating material.
For general objects, the relationship between resistance R, resistivity ρ, length I and cross-sectional area A is as follows

In the above formula,
• Resistance R in ohms
• Length l in meters
• Sectional area A is in square meters
• The unit of resistivity ρ is ohm·meter
(4) Mechanical stress strength: According to different insulating materials, various reliability verifications such as stretching, compression, bending, shearing, impact, fatigue, etc. are defined accordingly, which are called mechanical stress strength.

(5) Other specifications: Insulation materials can be solid or gel-cured. For example, the specifications of gel-cured insulating materials include viscosity, hardness, expansion coefficient, curing time and curing temperature. The specifications of solid insulating materials also include permeability, oil resistance, elongation, shrinkage, solvent resistance, and voltage resistance.

What is insulating material?

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1. What is insulating material?
The insulating material is not absolutely non-conductive. Under the action of a certain applied voltage intensity, when it exceeds its withstand voltage specification, physical conditions such as conduction, loss, breakdown, and arc will still occur, and aging will cause damage to the insulating material. Pressure reduction, surface peeling and other physical phenomena.

▶Materials can be roughly divided into conductors and insulators, and insulators are also called dielectrics. Under the specifications of its own withstand voltage, it is shielded and non-conductive, and the material whose resistivity is generally greater than 1010Ω·m is called insulating material.

▶The characteristics of insulating materials are insulation resistance, withstand voltage, moisture resistance, high temperature resistance, etc. The resistivity of the insulating material is very high, usually in the range of 1010-1022Ω·m. In high-frequency transformers, insulating materials are often used to isolate the coil from the coil or external electrical appliances to ensure the safe operation of the transformer.

Do you know how to calculate inductor power loss?

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The calculation of the loss of main power consumption components in UPS such as transistors, inductors and transformers has always been a difficult problem in customer applications.

In order to improve the accuracy of the design, it is necessary to provide a proven and prescriptive calculation method for the power consumption of the components.
With the ever-increasing demands on power supply efficiency,

the need to improve inductor efficiency is rapidly increasing, which is a result of the increase in power supply output current.

At the same time, the industry is making further efforts to reduce power dissipation,

which has a direct impact on overall power efficiency.
Reducing heat generation is especially important for notebook & desktop/server computer users

Inductance loss is mainly composed of core loss and coil loss, and core loss includes hysteresis loss and eddy current loss.For the powder core type magnetic core, due to the large insulation resistance between the magnetic materials,the eddy current loss can be almost ignored.The power loss in an inductor is determined by the basic formula:
P Loss inductor= P core+ P dcr +P acr

Pannelli solari che producono idrogeno sul tetto di casa

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“A unique combination of physics and chemistry”. With these synthetic words Professor Johan Martens, of the Belgian University KU Leuven, already in 2019 explained the special “waterstofpanelen”. A domestic photovoltaic panel capable of producing hydrogen from the air.

After 3 years, today the device can count on several prototypes. And on a dedicated company, the university spin-off Solhyd Project which is about to install the first pilot production line.

Through the support of the Belgian government and the technical assistance of Comate Engineering & Design, the project managed to make the first big leap in quality. In fact, it has a new site at its disposal in Bierbeek, a city not far from Leuven. As the company explains in a press release: “Here we have the space to develop and test hydrogen panels, but also to produce them.

Initially, we will produce several dozen panels for small-scale test setups. But there is room for more. Thanks to government subsidies, we can develop a pilot production line here. Eventually we could produce hundreds and even thousands of modules.”

The main big goal of the project is to make green hydrogen accessible to everyone through a technology that is easy to manage and install. As explained by Jan Rongé, founder of the Solhyd Project, from the pages of vrt.be. “We expect that from 2030 it will be possible to install hydrogen panels on the roofs of houses”.