The thermal management of power adaptor
Power adapter is a small portable electronic equipment and electronic electrical Power supply conversion equipment, widely supporting the telephone child machine, game machine, language repeater, walkman, notebook computer, cellular phone and other equipment.
The power adapter is generally composed of a shell, a power transformer and a rectifier circuit. According to its output type, it can be divided into AC output type and DC output type.
According to the connection mode can be divided into wall type and desktop type. Power adapter is widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation and other fields.
Due to the power adapter is used in a large amount of high power semiconductor devices, such as rectifier bridge pile, large current rectifier tube, power transistor or field effect tube devices, such as their work will produce a lot of heat, power supply temperature once more than 75 ℃, if can't take the heat out in a timely manner and at a reasonable level,
The normal operation of the power adapter is affected, and in serious cases, the power adapter is damaged.
Usually, the power adapter manufacturers will use some thermal insulation materials to help the power supply heat dissipation in the design and production. What are the thermal insulation materials commonly used in the heat dissipation scheme of the power adapter?
Heat conduction potting adhesive
Thermal conductive adhesive potting is divided into sub-division potting and overall potting. The internal of the power adapter is uneven and irregular. What is needed is a thermal conductive material that can completely wrap the transformer and cannot be moved freely.
Local potting will generally be concentrated in the heat, and can not be replaced by other thermal conductive materials.
The overall potting is because part of the power supply should work outdoors for a long time. In addition to solving the heat dissipation problem, the waterproof and sealing property of the power supply should also be taken into account, so the outdoor power supply basically uses the overall potting for heat dissipation.
Thermal conductive silica gel
Thermal conductive silicone piece for the power industry, the proportion of its application is usually less, but sometimes it is also essential, power adapter on the application of thermal conductive silicone piece usually focuses on PCB, will have a special application and demand a special kind of supply to meet it, thermal conductive silicone application on the PCB board,
With high thermal conductivity efficiency, electrical insulation, shock and puncture prevention and other functions, can effectively solve the safety problem for the client.
One component silica gel
One component silica gel is usually used in the local heat conduction of power components, but also can play the role of fixed components, for metals and non-metals have good adhesion and sealing.
Thermal conductive silicon rubber
Generally used in power supply MOS tube packaging, conventional standard parts, such as TO-220 and TO-3P, are usually coated with a layer of silicone grease on the silica gel sheet and MOS tube TO increase the fit and reduce the thermal resistance.
Alumina ceramic
Both thermal conductivity, temperature range and insulation performance are far away from superconducting hot silicone, which can be used TO replace the position of silica gel in MOS tube. For TO-220 and to-3P series, there are standard parts, so it is necessary TO increase the contact area with MOS tube by applying silicone grease.
Sinda Thermal is a leading thermal manufacturer in Power supply, our factory is composed of a team of thermal experts and many presice equipment, we are offering the most competitive price and great quality heat sinks to the customers in the world. Please contact us freely if you have any thermal requirements.
