Video surveillance. Video surveillance and security "Chestnut." Intercom and Kiev, Ukraine. Installation.

Video ? Power Supplies

Power Supply (BP) - a device for the formation of voltage required by the system, voltage of the electric network. The most common power supplies convert alternating voltage 220 V 50 Hz (for Ukraine and CIS countries, other countries use different levels and frequencies) at the desired constant voltage.
There are transformer and power supply.
A classic power supply BP is a Transformer. In general, it consists of down transformer, whose primary calculated on the power supply voltage. Then installed rectifier, converts alternating voltage in the constant. In most rectifier consists of one diode (odnopoluperiodny rectifier), or four diodes, forming a diode bridge (fullwave rectifier). Sometimes used and other schemes, such as in the rectifier with doubling the voltage. After rectifier set filter, smoothing fluctuations. Usually it is a simple high-capacity capacitor. Also, the scheme can be installed filters high-frequency interference, surges, protection from BB, voltage regulators and current.
In the power supply variable input voltage first rectified. The resulting DC voltage is used for power generators using which it is converted of rectangular pulses with frequency from 10 kilohertz to 1 megahertz, served on the transformer. In such BP may apply small transformers - This is because with increase in the frequency of the supply voltage reduced requirements for size (plane) core. In most cases, the core can be made of ferromagnetic materials, in contrast to the cores low-frequency transformers, for which steel is used. One from the output windings of the transformer used to control generator. Depending on voltage on it (for example, when changing the load-current) changes the frequency or skvazhnost pulse at the output of the generator. Thus, this feedback supports the power supply stable output voltage.

1.

�5-12-01B - IRS
Average rating of product or service buyers:

Output voltage 13.2 Nominal output current 5 A maximum output current 6 A metal box under the battery 7 A ? h.

Price: $ 65.00

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2.

K3-12-01B - IRS

Pulse uninterrupted power supply 12V / 3,5 A + boxing

Price: $ 46.00

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3.

K2-12-01B - IRS

Output voltage 13.2 Nominal output current of 2 A maximum output current of 2.5 A metal box under the battery 7 A ? h.

Price: $ 46.00

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4.

SAP-02 - China

Output voltage 12V nominal output current of 1 A maximum output current of 1A Dimensions 60 x 75 x 30 mm Variants performance (220 V supply): - bracket for electrical outlet.

Price: $ 8.00

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5.