[Module Power Supply Knowledge] Do you know several common small problems of power supply?

If the power plant outputs "clean" high-quality power supply, but the power supply passes through transmission and distribution, it is affected by the damage caused by weather, user equipment, and human factors, power supply quality problems such as voltage overshoot, drop, interruption, and common mode noise are quite prominent. Especially in industrial environments, the power supply quality is generally worse. What we can't ignore is that the power distribution of buildings designed in the early years is no longer suitable for the needs of today's information society. Power grids often occur and cause interference or damage to computers and precision instruments, mainly in the following aspects:

1. powersurges: the output voltage valid value is higher than the rated value of 110%, and lasts for one or more cycles. The surge is mainly caused by the shutdown of a large electrical appliance connected to the Internet (for example, when a common household air conditioner is shut down ), the high voltage caused by sudden uninstallation of the power grid (we will all have such a personal experience: during the period from to, it is the peak of electricity usage, and the mains voltage is generally low, the lights in your home are relatively dark. When the peak traffic goes off, for example, at, you will find that the lights in your home are suddenly flashing and lit up a lot, this is the most common phenomenon in our daily life ).

2. High Voltage Pulse (highvoltagespikes): refers to the voltage with a peak value of 6000 V and a duration from one thousandth second to 1/2 cycles (10 ms. This is mainly caused by lightning strikes, arc discharge, static discharge, or switch operations on large electrical equipment.

3. transient overvoltage (switchingtransients): refers to the pulse voltage with a peak voltage of up to 20000 V, but with a duration ranging from one second to one thousandth second. The main cause and possible damage are similar to high-voltage sharp pulses, but there are differences in the solution.

4. powersags: a low-voltage state in which the mains voltage valid value ranges from 80% to 85% of the rated value and lasts for one to several cycles. Such problems may occur when a large device is started, when a large motor is started, or when a large voltage regulator is connected.

5. Wire noise: RF interference (RFI), electromagnetic interference (EFI), and other high-frequency interference. The operation of the motor, the action of the relay, the operation of the motor controller, broadcast emission, microwave radiation, and electrical storms will cause line noise interference.

6. frequencyvariation: the change of the mains frequency exceeds 3Hz. This is mainly caused by the unstable operation of emergency generators or the unstable frequency of power supply.

7. continuous low voltage (brownout): The valid value of the mains voltage is lower than the rated value and lasts for a long time. The causes include startup and Application of Large devices, Master power line switching, startup of Large motors, and line overload (this problem exists in many regions of our country ).

8. Power outage (powerfai1): the power outage we usually encounter. The causes include Circuit Breaker Trip, mains supply interruption, and power grid failure.

As humans enter the information society, how to protect computers, networks, and data is a matter of great concern. The design, monitoring, and improvement of power quality is not only a matter of quality, but a matter of security. The normal operation of the uninterrupted power supply society is a new topic. Generally, simple user solutions can improve the power supply quality of information equipment through AC voltage regulators, anti-interference filters, and uninterruptible power supplies. At the same time, we must also consider reducing the pollution of information equipment on the power grid and improving the power factor, reduce the Current harmonic component and restrain the interference of conducting radiation within a certain range.

 

[Module Power Supply Knowledge] Do you know several common small problems of power supply!

[Module Power Supply Knowledge] Do you know several common small problems of power supply?