Power supply 5V / 12V / 24V
Switching power supplies for LEDs are the best and most popular. Their main advantage is high efficiency at low cost of circuit components. Unlike incandescent and fluorescent lamps, LEDs can only be powered with stabilized voltage. They are generally very sensitive to nutrition. Voltage surges that are not dangerous for a fluorescent lamp (in most cases, it is powered through a simple choke) will easily disable the LED. Hence - very high requirements for power supplies. You need to know all of them for the right choice.
Price Advantages of a Pulse Circuit
The pulse circuit works on the same principle as a conventional transformer circuit, only the mains 50 Hz alternating current is preliminarily increased by the generator by about 2 thousand times. This makes it possible to use very cheap and compact LED transformers. A transformer the size of two matchboxes will provide about 50 watts of power. Of course, the power supply is full of other components, so the overall dimensions are much larger, but the gain in the cost of an expensive copper transformer is still very significant.
The second feature is stabilization. You cannot simply connect an LED to the transformer output. You need to use a stabilizer. There is generally only one impulse option without alternatives, since parametric analog stabilizers have very low efficiency,
In comparison with transformer power supplies, impulse power supplies have 10 and 100 times lower cost per 1 W of power.
Switching power supply options for LEDs
Switching power supplies from different manufacturers have almost the same circuit design. This is due to the fact that for decades the best, most economical scheme has been selected. Specialized microcircuits, diode assemblies and other components are used to significantly reduce costs. The mains input 220 is necessarily protected by varistors, which greatly increases the service life. There are four standards for the output voltage: 5, 9, 12 and 24 volts. Of these, 12 and 24 volts are popular. Levels 5 and 9 are rarely used.
leaky block in a perforated casing;
sealed enclosure for outdoor installation;
charger form factor (plug body).
Power supplies for LEDs in a "plug" case (like a mobile charger) are very convenient for any portable devices: LED table lamps, spotlights, specialized illuminators. Their output current usually does not exceed 2 A, which corresponds to about 25 W of power. For LED strips, a perforated non-sealed case is convenient. The main advantages are good heat dissipation, excellent reliability and low price. In terms of 1 W of power, it is lower than all other form factors. The perforated metal case is such a good solution that it is used in industrial power supplies for any power range.
Sealed enclosures are installed outdoors in the street. Their main field of application is LED advertising structures and facade lighting. They should not be used at home.
Features of power supplies
Any LED requires a stabilizer. Transformers for LEDs (even high-frequency pulse ones) cannot be used just like that. The switching regulator allows you to get the highest possible efficiency. It has a rather complex circuit, in which the emphasis is on protection against mains voltage. In any power supply unit, even the most budgetary one, there is no direct galvanic connection of the output low-voltage circuit with a 220-volt network. This makes them safe devices. There is only a transformer connection, through reliable insulation between the windings. In terms of protection against mains voltage, pulse sources are ahead of transformer ones.
Power source selection
The selection is carried out according to three parameters:
form factor of execution.
In terms of power, a margin of 10% should be made. Too much stock, for example, 100% is also not needed. This will increase energy consumption and the initial cost of the equipment. It is not necessary to load the DC power supply to 100% as it will begin to operate in the extreme temperature mode. Heat dissipation should be considered when choosing an installation site. The switch must be installed at the entrance, not at the exit. These simple rules allow it to be operated without repair for a number of years.
For LED strips, the power is calculated by the number of meters and the parameters indicated on the package. It is also indicated for floodlights, low-voltage lamps and all other products. If the information about the power is not known (this very often happens with LED strips) when the package is lost, then it can always be accurately set using an ammeter. Readings in amperes must be multiplied by 12 (or other values corresponding to the supply voltage).
The form factor is determined by the operating environment. Sealed and semi-sealed enclosures are useless at home. This is an extra surcharge in cost and an extra heat load for the components of the device, but for lighting pools, fountains, you cannot do without them. Outdoor decorative and outdoor lighting often has a lot of power, so manufacturers produce the corresponding power supply models. A typical sealed model has a power of about 25 watts. Perforated "home" power supplies have a power of 5 watts.
Purchase from us
We offer you several hundred of the best switching power supplies to choose from. Our advantages:
all form factors;
all standards for output voltage;
fast delivery, sending the shopping cart across Ukraine;
professional selection of equipment sets.
Contact our consultant on the website, call, or come to our office in Kiev. We are waiting for your orders.