Eahunt 13.5W Charger KC Hot Sale

A. What is a power adapter? What are its characteristics?
Power adapter (Power adapter), also known as external power supply.
Is a small portable electronic equipment and electronic appliances power supply power conversion equipment.
Generally by the shell, power transformer and rectifier circuit.
According to the connection can be divided into wall and desktop type.
Commonly used in cell phones, LCD monitors and notebook computers and other small electronic products.

Its working principle is simple:

It is the unstable power supply using the principle of switching power supply.
Through the conversion circuit into a constant voltage DC power needed by the laptop, to power and charge the laptop.

What are the characteristics of the power adapter?
Feature 1, small size, light weight.
Switching power adapters do not use bulky industrial transformers.
As the power dissipated on the switching MOS tube is drastically reduced, a larger heat sink is eliminated.
Because of these two reasons, so the switching power adapter is small in size and light in weight.

Feature 2, low power consumption and high efficiency.
In the switching power adapter circuit, the switching MOS tube is excited by the excitation signal.
it alternately works in the on-off and off-off-off switching state.
Conversion speed is very fast, the frequency is generally more than 50kHz, in some advanced switching power supply circuit, can be several hundred or nearly mega-Hz.
This makes the switching MOS tube power consumption is very small, the efficiency of the power supply can be greatly improved, its efficiency can reach 90%.

Feature 3, the efficiency of the filter is greatly improved, so that the capacity and volume of the filter capacitor is greatly reduced.
The operating frequency of switching power adapter is basically working above 50kHz at present.
Is more than 1000 times that of the linear regulated power adapter.
This makes the rectifier filtering efficiency almost 1000 times higher;
Even with half-wave rectification and capacitor filtering, the efficiency is also increased by 500 times.
In the same ripple output voltage, the use of switching power supply, the capacity of the filter capacitor is only linear regulated power supply filter capacitor 1/500 ~ 1/1000.

Feature 4, wide voltage stabilization range.
The output voltage of the switching power adapter is regulated by the duty cycle of the excitation signal.
Changes in the input signal voltage can be compensated by frequency modulation or widening.
In this way, it can still ensure a stable output voltage when the industrial frequency grid voltage varies greatly.
Therefore, the switching power adapter has a wide voltage stabilization range and a good voltage stabilization effect.

In addition, there are two methods to change the duty cycle: pulse width modulation type and frequency modulation type.
Switching regulated power supply not only has the advantage of a wide voltage regulation range, but also has more methods to realize voltage regulation.
Designers can flexibly choose various types of switching power supply integrated circuit chip program according to the requirements of the actual application.

If you want to know more about switching power supply information, you can consult Xiamen Eahunt Electronics.

Whatsapp:+86 13860786068

Email: athene-cai@eahunt.com

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