Why does the phone charger have a buzzing sound when charging

The reasons are as follows: 1. The mobile phone charger is currently working in an overload state, that is, the maximum power supply current provided by the mobile phone charger is less than the normal charging current of the load.

Solution: Change to a charger with higher power to charge the load.

2. The magnetic core of the internal high-frequency transformer of the mobile phone charger is loose, resulting in a buzzing sound when the transformer is working.

Solution: Replace the mobile phone charger with a new one, pay attention to anti-falling, it is easy to cause the transformer core to loosen.

Common mobile phone chargers are switching power supply structure, the internal working frequency is high, generally will not make sound, if the sound is made, there are two possibilities: 1The switching frequency is reduced to the hearing range of the human ear, usually due to the charger overload (that is, the rated current of the charger is less than the rated current of the load), or the primary side of the charger oscillation circuit is not working properly; 2.

The high-frequency transformer core is loose.

Mobile phone chargers that use power frequency transformers are rare, but they are not impossible, and it is normal for power frequency transformers to have a 50Hz hum sound after powering on.

1.The sound of the power adapter when charging is a problem caused by the aging of the line, which will lead to the instability of the rated power that rushes into the mobile phone battery, and the long-term use will burn out the mobile phone battery or shorten the battery life [it is recommended to replace the charger with a new one].

2.Rated power refers to the power of the appliance when it is working normally. Its value is the rated voltage of the appliance multiplied by the rated current. If the actual power of the appliance is greater than the rated power, the appliance may be damaged.

It should be the sound of electricity or interference! Ordinary mobile phones don't have this problem!! Try not to use it while charging.

This is normal, Nokia is like that.

After the mobile phone is connected to the charger, it keeps emitting a prompt sound, which means that the charger used is not the original charger, and it is recommended to replace it with the original charger of the mobile phone; If you use the original charger, it will also sound after using it, which may be caused by the unstable connection of the charging head.

In addition, when the 400V capacity of the high-voltage electrolytic capacitor drops, the current is unstable, the copper sheet in the socket is oxidized, the plug cannot be in close contact with the socket or the power pipe is working, these will cause the mobile phone to emit a prompt sound after connecting to the charger, so you can change to a new socket to try.

So how do you charge your phone properly? Here's how it works:

The first step, before charging, is to take off the phone case. Because when charging, the phone will heat up, and with the "protection" of the phone case, the phone will become hotter.

The second step is to turn on your phone's airplane mode. Turning on the airplane mode of your phone and charging it again can make your phone charge faster.

The third step, when charging, plug in the power supply first, and then connect the mobile phone. This does not generate impulse voltages and is relatively safe. After the battery is charged, you should unplug the phone first, and then unplug the power supply, because at the moment of unplugging the charger, it is easy to generate reverse current, which will also hurt the phone.

Fourth, when charging, don't charge your phone while playing with it, don't wait for the phone to run out of power before charging, generally when the power supply is 30%, you should charge the phone.

1. The sound emitted when the mobile phone is charging is the sound of current. The mobile phone charger produced by the regular manufacturer generally does not have any sound when charging. If you buy a ** mobile phone charger, then it is usually normal for the charger to have a very weak current sound when you use it at the beginning.

Second, the mobile phone charger produced by regular manufacturers, in order to ensure the safety of use, usually use an isolation transformer, and inferior mobile phone chargers usually use a capacitor regulator, once the capacitor is broken down, it will cause huge damage to the mobile phone.

Third, the charging macro is generally used for a period of time before the current sound, which is usually because the filter has some faults, so that the output current has an AC component, which will have a certain impact on the charging control circuit of the mobile phone, so once the mobile phone charger has a current sound, and the sound begins to increase, then it is recommended to replace the charger.

4. If you have other chargers on hand, you can temporarily replace the original charger, but you must choose a charger whose output current and voltage meet the requirements of your mobile phone.

"Charging" is the process of replenishing the power of equipment such as Xianghong Pond, which is not registered. The principle is to let the direct current pass in the opposite direction of the discharge, so that the active substances in the battery can resume their effects. Charging behavior of devices such as printers.

The working process of the battery receiving electrical energy from the external circuit and converting it into the chemical energy of the battery. After the energy of the battery is consumed by discharge, it can be restored by charging and can be re-discharged, constituting a charge-discharge cycle.

There are two general directions to increase the charging speed: one is to increase the voltage, and the other is to increase the current. Increasing the voltage increases the amount of heat generated during charging, accelerates battery aging, and can pose a safety hazard, so the actual effect is not good.

The reason why the charging of Huawei mobile phones will sizzle:

1. During the working process of the charger, the internal components will be stressed, and slight vibration is inevitable, so it will make a sizzling sound, which is a normal phenomenon.

2. It is recommended that you pull out the charging head in time when you are not charging, there is no safety risk in this sizzling sound, and you can use it with confidence.

What's wrong with the sizzling sound of the phone charging charger?

1. The ** of this sound is the high-frequency transformer inside the charger.

2. The mobile phone charger belongs to the parallel switching regulated power supply, and the 220V AC power in the socket is first rectified to 310V DC in the charger.

3. After the transformer is stepped, the secondary winding outputs low voltage, which is output after rectification filtering. Due to the simplification of the internal circuit of the mobile phone charger, most of them use the LC oscillation circuit to generate the oscillation signal, and the feedback winding of the transformer is a part of the oscillation circuit, so the change of the transformer load will directly affect the oscillation frequency.

4. When the mobile phone is charging, the load is relatively heavy, the output current decreases when it is close to being full, and the charger is close to no-load, the oscillation frequency will change, and if it drops below 20kHz, the human ear will be able to hear it.

Here's why:

1. It may mean that the voltage of the mobile phone is too high when charging, which is related to the charger in most cases, and it is likely that the user does not use the original charger.

2. There may be a problem with the power management module equipped with the mobile phone.

3. It is also possible that the mobile phone has suffered gravity trauma or has been repaired or replaced, resulting in poor contact between the battery and the mobile phone motherboard.

Introduction:

A mobile phone battery consists of three parts: the cell, the protective circuit, and the shell. At present, mobile phone batteries are all lithium-ion batteries (often referred to as lithium batteries in non-standard situations), and the cathode material is lithium cobalt oxide.

Standard discharge voltage, charge cut-off voltage, discharge cut-off voltage. The unit of electricity is Wh (watt-hour), because the standard discharge voltage of mobile phone batteries is uniform, so it can also be replaced by mAh (milliampere-hour). The conversion relationship between these two types of units on mobile phone batteries is:

Watt-hour = ampere-hour.

Overcharging, over-discharging, and short-circuiting can seriously impair the performance of the battery and may result in a risk of use. For this reason, there is usually a slender protective circuit board in the mobile phone battery to prevent these risks.