source:Industry News Popular:adapter release time:2020-03-10 11:23:25 Article author:小编
communication
High reliability, high temperature, lightning protection, and large voltage fluctuations. For example, the power system used by the J central office equipment is generally 48V output; various base station amplifiers generally use 3.3V, 5V, 12V, 28V power supplies, 3.3V, 5V general With chip, 12V fan, 28V output power amplifier.
Instrumentation
Generally, there are many output channels. To prevent mutual interference between groups, the power supply requires high voltage regulation accuracy, and some need to be isolated. (Some of the input voltage is DC, and the frequency of some ships or airplanes is 440HZ) Some instruments, such as oxygen generators, hydrogen generators, etc., also require constant current power supplies, and require very little leakage current.
Security
Generally used with battery charging, such as 12V 13.8V, 13.8V is generally used with battery charging, and switch to 12V battery to supply power after AC power failure.
optical fiber
Network switches generally use a combination of 3.3V 5V and 3.3V 12V. 3.3V generally has a chip. The power varies according to different types. The voltage regulation accuracy is high. 5V and 12V have a fan. The current is small. The voltage regulation accuracy does not need to be very high. high.
Medical treatment
High safety requirements, small leakage current, and high withstand voltage are required.
LED display
Very good dynamic response, high temperature resistance, and some may require a large overcurrent point. Typical examples are 5V30A, 5V50A power supplies and LED decorations. Because of the lighting requirements, constant current is basically required to achieve uniform brightness.
Tax control
Emerging industries are controlled by the government, and the volume after production may be very large. Except for a few, they basically use a combined power supply of 5V and 24V, 5V for the main chip, and 24V with a printer. The whole machine must be used for EMC.
Set-top box
Generally there are many channels, typical voltage is 3.3V 5V/12V/22V 30V, or some ATX standards, the current of each channel is very small, and the total power is generally about 20W, which requires a lower price. The power of some set-top boxes with hard disks will exceed 60W.
LCD TV
Usually there are more than 3 channels 24V/12V/5V, 24V with LCD display; 12V with audio system; 5V with TV control board and STB.
Switching power supply
New industries involved: audio-visual equipment, battery cabinet charging equipment, VOIP communication terminal equipment, power modem equipment, non-contact identification equipment, etc.
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