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| CCTV surveillance power switch selection guide
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Switching power supply as the heart of electronic equipment, electronic
equipment safe and reliable operation has a crucial role. Therefore, the
electronic equipment in the system development stage should be conducted on the
power of choice, rather than in the entire system of almost complete when the
choice of power, otherwise the system will often delay the development time,
increase the cost.
Choice of switching power supply when the need to
consider the main issues are:
according to usage, the need to set
output voltage and current;
power of the size, installation and
installation of holes;
a few output, the output of all the need for
electrical isolation;
input voltage range;
According to the
environmental temperature, decided to switch power to lower the amount of Power;
the need for the regulation and certification standards;
power of the cooling method: natural cooling or forced air-cooled;
electromagnetic compatibility standards.
In order to improve the
reliability of the system, the proposed switching power supply work in 50 to 80
percent better load, that is used by the assumption that power is 20 W, should
use a power output of 25 W-40W switching power supply.
Selection
criteria as far as possible the power supply manufacturers, including the
standard size and output voltage. This delivery will be faster the contrary, the
special size and output voltage, will increase development time and costs.
Clear input voltage range, to enter the exchange as an example, the
common input voltage specifications are 110 V, 220V, so there will be a
corresponding 110 V, 220V exchange switch, and universal input voltage (AC:
85V-264V) three specifications. Should be selected based on the use of regional
input voltage specifications.
Switching power supply at work will be
part of power consumption, and heat in the form of release, so users in the
system design (especially the closure of the system) should consider switching
power supply of heat.
This is also available in a special situation,
such as: output with the electrical, printers, light bulbs, relays, and other
large negative impact on, the current great moment, the best able to provide the
maximum load current, so that we can specifically design; system for lightning -
Prone areas, or on the Peak, and other sensitive locations, lightning, lightning
protection system design at the same time, the best choice to bring the
Lightning Protection function switch power to protect the safe operation of
equipment.
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