How to Choose an AC-to-DC Power Converter

A power supply or ac to dc converter is an electrical device that takes in alternating current (AC) and turns it into direct current (DC).

AC-DC converters are needed to give an electrical part the right amount of power it needs. They are used to power electronics that only work with batteries and have no other way to get power.

Find out more about the two main kinds of AC/DC converters below to choose the right one for your needs.

  1. Linear Devices

Even though linear devices are simple and not too expensive, they are usually big and not very good at what they do. Linear devices are made to make less noise and are often very quiet because they don’t switch on and off quickly. For example, a linear power supply uses a big transformer to drop the voltage from an AC line to a much lower AC voltage. It then uses rectifier circuits and filtering steps to clean the DC voltage.

A/D converters, laboratory test equipment, automatic test equipment, low noise amplifiers, medical equipment, communication equipment, signal processing data acquisition, sensors, multiplexers, sample-and-hold circuits, control circuits, computer applications, and industrial applications are some examples of where linear power supplies are used.

  1. Changing Things

SMPS is used in AC to DC converters and switching devices (switched-mode power supply). A switching regulator moves very quickly between full-on and full-off states to save energy. These devices are smaller, lighter, and more efficient but are also more difficult to use. If they aren’t carefully kept down, they can cause problems with electrical noise, and simple designs may also have a bad power factor.

Manufacturing, communication systems, mobile stations, network equipment, electroplating, anodizing, and many other things use switching devices.

Mornsun’s power supply solutions meet the safety standards set by the IEC 62368 and the IEC 60950. Wattages can range from 1W to 1000W.

Help With Installation

Make sure that all of the necessary peripherals are connected correctly.

Connect a fuse to the AC input line (L) to meet operating safety standards.

Before you finish designing the circuit, check all of the parameters and circuits.

Do not run the available AC/DC converter for long periods when the temperature is high. However, if it has to be used in hot conditions, you should get a new converter every year or two.

Avoid putting big things that heat up near the converter, like a CPU, an electric machine, etc.

Don’t worry about the slight noise coming from inside the converter. This is normal when the load is low or there is no load.

Professional designers should be in charge of putting in the converter.

The converter case should be placed next to the device shell with heat-conducting glue if the device is used in a closed space.

Ac/Dc Converter Applications: Ways To Get Rid Of Heat

Cooling with Fresh Air

Due to cost and space concerns, natural air cooling is often used as the main way to get rid of heat. In this case, heat could escape to the outside air through a gap between the converter, the PCB, and the converter shell. Also, heat can escape from the shell of the converter and exposed surfaces to the PCB by radiation or heat moving through the terminals (pins) to the PCB.

Cooling by Forced Air

This method involves putting in a fan as the main way to get rid of heat since most applications don’t work better even when a heat sink is put in.

For the long-shaped converters, the fan can go in a horizontal direction, and in the channel, the fan can go in a vertical direction to make a chimney. Another way to make the fan and converter shell fit together tightly is to coat them with thermal grease.


When making circuits for electrical equipment, you need power supplies that can work even in the worst conditions. When choosing a manufacturer for your electrical projects, it’s important to consider how reliable the power supplies are.

Mornsun is one of the best companies making power supplies with its designed and protected intellectual property integrated circuit, an innovative transformer structure, a unique assembly system, and a unique look. Contact us or ask for a sample to learn more about our reliable power supply solutions.

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