Important type of power adapter and fault detection steps

　　Author ：Iflowpower – Portable Power Station Supplier

With the rapid development of society, our power adapter is also developing rapidly. So you understand the detailed information of the power adapter? Next, let Xiaobian lead everyone to learn more about knowledge. Power adapter, also known as external power supplies, commonly used as a power supply voltage conversion device for small portable electronic devices and electronic devices.

It is usually used in small electronic products, such as mobile phones, LCD displays and notebook computers. Its function is to convert the 220 volt high pressure of the home into these electronics to maintain a stable low pressure of about 5 volts to 20 volts. Power adapter is a small and easy-to-carry electronic device in life.

The device is the same parameters as the product to be charged, that is, it can convert power devices. Power adapters are typically composed of housing, power transformers, and rectifier circuits. Moreover, the power adapter also has two output modes, typically an AC output and DC output.

Of course, there are different outputs and have different connection methods, usually have walls and desktops. There are two important types of power adapters, switching power supplies and linear power supplies. 1.

The power source is a power source that utilizes modern electronic technology to control switch time ratio and maintain a stable output voltage. The switching power supply of the power adapter is generally composed of a pulse width modulation (PWM) control IC and MOSFET. Advantages: high efficiency, small size, can work within the wide voltage range.

Disadvantages: The interference of the power circuit is very large, and it is difficult to troubleshoot when the fault occurs. 2, sex power by transformer, rectifier circuit rectifier filter converts AC to obtain unstable DC voltage. In order to achieve high-precision DC voltage, the power adapter must adjust the output voltage by a voltage feedback circuit.

Advantages: The power supply is mature, simple circuit, no interference and noise. Disadvantages: The voltage feedback circuit is in an online state. Due to the use of inductors, the modulator has a large power consumption, low conversion efficiency, large equipment weight.

Power Adapter Fault Detection Steps First, you can check if the power adapter or laptop battery is good by gently shaking the power connector or battery. If it is not normal, try reinstall the power adapter or battery. Possible failure is that the power connector deformation or decrease in battery contact flexibility.

If the power supply or battery connector is good, use the multimeter to measure the output voltage of the power adapter or battery, which is important to check if the output voltage is stable and whether the actual output voltage value is consistent with the nominal voltage of the power supply. If the output instability or the actual output voltage is consistent with the product nominal value, the damaged power adapter or battery is replaced. If the notebook power board is good with the power adapter and battery contact, use the commonly used replacement method to check if the notebook power board is normal.

If it is not normal, it can be replaced or repaired. If the above detection steps are displayed normally, the housing of the laptop is turned on, check if the power board and the motherboard are in good contact. If the power board is in good contact with the motherboard, it can be inferred that the fault is on the laptop motherboard.

If the above method is confirmed that the power board, motherboard, power adapter and battery are normal, you can infer that other important components are corrupted (eg, energized circuit faults), to replace or repair these important components. Such power conversion devices typically spend a long time, and many problems will be prevented. Symptoms such as line failure and voltage instability are often occurred.

Therefore, what should I do when there is a failure? 1. First, we can determine the situation according to the instructions. You can view the indicator of the power adapter.

If the indicator lights up, it is usually considered that the power supply of the adapter has no problem, and it must be ensured that the indicator is not damaged. 2. Try to prevent disconnection of internal cables to avoid power line.

If the external power is not powered, you can insert the battery and try. If the machine can start normally, the power cord or adapter may have problems. Then use the multimeter to check if there is a problem with the power cord to simplify maintenance.

Do not try to turn on the power adapter housing at the beginning. Turn on the power adapter housing is really too big. 3.

If the original adapter does not repair or too late, you can use another adapter to replace, as long as the output voltage and power are substantially equal, etc. There is a regulator circuit inside the laptop, so it is not worried that the output voltage does not match. The above is the detailed analysis of the knowledge of the power adapter, you must constantly accumulate related experience in the actual situation, so that you can design better products and better develop for our society.