Consider the charger for your phone. Strong electricity is provided by the electrical socket, but your phone just requires a tiny, moderate quantity. That electricity must be safely turned off by something inside the charger. This function is carried out by a tiny component known as a flyback transformer in many chargers. You will discover what it is, how it functions the types that are accessible and how to choose the best one in this blog. Simple language is used to explain everything.
Flyback transformer is an electrical component whose main function is voltage regulation in the current. Besides, it isolates the input from the output, and as a result, electric shock from the wall cannot get to the user of the appliance. What makes it unique is its ability to temporarily store the power.
Imagine a slingshot – first you have to pull it and only then release it. Similarly, this device first stores the power and then passes it further, while many other transformers pass the current through instantly.
It is due to its simplicity and reduced cost that a flyback transformer has become very popular for use in smaller power supplies, normally up to 100 watts. The flyback transformer can provide multiple outputs and ensures that there is a stable output regardless of slight variations in the input voltage provided by the mains.
The process is pretty simple to comprehend and consists of two stages repeated thousands of times per second.
In the first stage, a switch closes, current starts flowing through the first, called a primary, coil. Magnetic energy fills up the central part of the transformer, referred to as core, similar to the way a tank fills with water. During this process, nothing gets to the output. A tiny component, referred to as a capacitor, sustains the functioning of your appliance in this period.
The switch opens in the second stage. The magnetic energy, unable to stay in the core any longer, starts pouring into the second coil, referred to as secondary coil, and gets out to the device you need to power up. This is similar to opening the valve of the water tank. The name of this stage is “flyback” due to the stored energy discharge.
A small control chip decides how long the switch stays on each time. If it stays on longer, more energy is stored and more power goes out. If it stays on for less time, less power goes out. This is how the output stays steady.
There is one important thing to remember. Every transformer can store only a limited amount of energy. If your device asks for too much, the core becomes full and the power supply stops working properly. That is why the maximum current rating of a flyback transformer must always be higher than what your device really needs.
Transformers of this kind are usually divided by the way they work and the way they are built.
By working style, there are two main kinds. The first is called continuous mode. Here, the transformer starts the next round before it has emptied all its energy. This works well for higher power. The second is called discontinuous mode. Here, the transformer gives out all its energy, rests for a tiny moment, and then starts again. This is simple and quick to respond, so it suits lower power. Some designs can work in both ways, depending on how much power the device is using.
By build, the most common type uses a ferrite core, which is a special magnetic material, in shapes such as EE, EFD, and PQ. Different shapes are chosen for different amounts of space and heat. Planar types use flat, thin coils, so they fit inside slim devices. High voltage types can make thousands of volts and are used in things like ignition systems and special lights. A flyback transformer can also be made to order when a standard size does not fit your product.
You will find flyback transformers in many things you use every day. They are inside phone chargers, laptop adapters, LED lights, TV boxes, and battery chargers. They are also used in telecom equipment, solar systems, and internet cameras that get their power through the network cable. They work best when the power needed is less than about 100 watts. For bigger machines that need more power, other types of designs are usually a better choice.
Choosing the right one is easier when you go step by step.
First, know your input. Find out what voltage your power source gives, and note the lowest voltage it can drop to. Second, know your output. Write down how much voltage and how much current your device needs. Multiply the two and you get the power in watts.
Third, allow some margin of safety. Avoid choosing a transformer which is just enough for your device. So that it won’t get overheated or fail due to excess load, choose a transformer which is capable of carrying slightly more load than needed. The biggest enemy of any transformer is the heat, thus, a cooler transformer will live longer.
Fourth, make sure about safety certification. In case your product will be available to customers, the transformer has to satisfy safety standards such as UL or IEC. Fifth, pay attention to the size. A component which won’t fit into your circuit board is useless, regardless of its theoretical perfection.
Finally, choose the supplier carefully. Datasheets, sample parts, and prompt customer service will be provided by a trusted supplier. You will never have to settle for something less than ideal since CET Technology can manufacture a custom transformer according to your exact specifications of voltage, size, and power.
A little transformer is crucial to the longevity, coolness, and safety of your gadgets. You can make a smart choice now that you understand how it stores and releases energy, what kinds of flyback transformers are available and what to look for before purchasing. The staff at CET Technology is pleased to assist you if you require assistance or a quote.
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