The power supply for 12V LED tape: the best choice

Using LED lighting in the interior, it is important that its work was stable, durable and has no adverse effects on human vision. The correct functioning of LED devices provide voltage converters, to choose to be by doing some calculations. Properly selected power supply for the LED 12B will prevent the tape from the LED voltage drop and premature loss of emission quality.

Types of power supplies for LED strips 12 volts

Unlike conventional incandescent lamps, LED designs can not be connected to the 220V. They come with a supply voltage of 12V or 24V. As the illumination in the home interiors of the most in demand 12V LED strip. To obtain the required voltage using special adapters - power supplies that convert the voltage of 220V to the desired 12V magnitude.

Before you choose a power supply for LED strip, should be familiar with their types and characteristics. Stabilizers for LED products are distinguished by the following criteria:

• capacity - 5; 15; 30; 60; 100; 150; 200 and 350 (W);
• functionality - only provide nutrition, with built-in dimmer (Dimmer) and / or with remote control;
• Cooling system - active and passive cooling. If the active system is built into the case fan, which emits a certain noise that can cause discomfort;
  

  The power supply for the LED 12B Tape

• protection - are models of sealed and unsealed;
• housing - Plastic, aluminum sealed for areas with high level of humidity, with metal perforations, and bonding pads (used for dry areas and requires installation in a confined space in order to avoid dust).

Voltage regulators are an essential element of high illumination, for maximum efficiency of the LED light sources. they supply LEDs electricity necessary parameters protecting from possible fluctuations and premature failure. Due to power supplies, tape LED emit uniform illumination without flicker.

Power supply for 12V LED Tape: calculating and device connection

To understand what the power supply is needed for the LED strip, it is necessary to make certain calculations that take into account not only the output voltage, but also the amount of current generated in the load. Therefore, for any particular illumination must calculate the total current consumed by all the LEDs in the stream.

Options for calculating the power supply for LED strip

Before you calculate the power supply for LED strip, you must familiarize yourself with the documentation accompanying the product, wherein said current consumption of one meter. In the absence of such data, the calculation can be performed independently.

For example, we calculate the total number of LEDs 12B for the tape length of 15 m, a density of 30 LED type SMD 5050 per meter: 15 (m) x 30 (. Units) = 450 pc. Given that each LED SMD 5050 consumes a current of 0.02 A (this value is shown in Table parameters diodes), the total value of the consumption current of the entire length of tape 9A (450h0,02 = 9). It will therefore be necessary with the power source 12B allowable load current value 9A.

Useful advice!Overall power supplies is quite difficult to hide in zakarniznoy design. Therefore, for illumination of ceilings do not recommend the use of tape with a high density of LEDs, which are needed for powerful converters.

When calculating the power supply capacity for the LED strip, voltage and multiply the value obtained: 12Vh9A = 108 watts. Consequently, the stabilizer will be acceptable capacity not less 108Vt. Note, however, that the block selected with the 20 percent reserve power, otherwise it will quickly fail overload. Hence, the required capacity will be: 108h1,2 = 129,6Vt, ie.. for this case will be the optimum choice of power supply for the LED 12B tapes - 150 watts.

In addition, you can calculate the power converter using the data on the basic characteristics of flexible LED-products. After selecting the type of tape is found in the table corresponding to the power value of a meter and is multiplied by the total length of illumination. Given the supply of power, we obtain the required power supply unit.

Table of basic technical indicators 12V LED strips:

class LEDs	LED Size, mm²	Power LED strip W / m	Ribbon density, pc. / m	The value of the luminous flux lm / m
SMD 3528	3,5h2,8	2,4	30	150
4,8	60	300
9.6	120	600
SMD 5050	5x5	7,2	30	360
14,4	60	720

EXAMPLE connect LED strip to the power unit

Assemble the selected backlight surface necessary after the tape is connected to the LED power supply. Using for example the connection tape to the block body is made of metal and has holes for cooling the constituent elements and the terminal strip. One of the walls of the housing is provided with a sign indicating the labeling for correct wiring.

Terminals with the designation «L» and «N» - phase and zero, intended for connection to the 220V. «FG» Grounding indicated by the symbol. Terminals marked «G» are united with each other and are designed to connect the negative terminal of the LED strip. Three terminals with symbols «V» and connected inside the adapter and connect it to the positive terminal, respectively. It should be noted that such labeling is used on other models of transducers.

To connect a monochrome ribbon, attach the wires to the terminals, taking into account the polarity. The mains plug has three wires with a shell of brown, blue and yellow-green. Brown and blue wires are attached to the terminals of the "phase" and "zero", not afraid to mix as they can be interchanged. Yellow-green wire is strictly connected with the ground terminal. If grounding is not available, do not use the terminal: it does not matter for the functioning of the tape.

Note!The absence of the power cord ground wire is a violation of safety when performing electrical work.

The above connection example LED strip to the power supply suitable for illumination of a single tape length of 5 m. If you want to connect multiple tape segments, it is necessary to apply the parallel circuit connection.

Scheme parallel connection of LED strip PSUs

When the interior illumination becomes necessary several decorative elements arranged in certain distance from each other, a parallel connection is applied to the transducer tape segments voltage. This scheme is used when the design illumination line is long enough, and more than 5 m.

Series connection of the segments lead to an uneven load distribution, whereby LED strip will not work correctly in weak light radiating end portion. It is possible that the extreme section of the tape at all will not light up, while the initial starts to overheat and quickly fail. This suggests that connect the end of the first segment to the beginning of the second can not.

In parallel connection, each segment LED strip independently of the others must be connected to a power source. This can be done by connecting each piece of tape to the power supply with separate wiring. But parallel connection can be made in another way: to build the main line conductors from the inverter to which you can then connect the individual sections of the LED strip.

To contact conductors tape main wire was a reliable and strong connection using solder or by means of special connectors - connectors. Using connectors for connection considerably simplifies repair backlight if problems arise during operation. If the belt must be routed through a complex trajectory, can be applied as a main wire tape itself.

The price of the power supply for 12V LED Tape

Buy power supply for 12V LED tape can not only at the points of sale of lighting, but also on the websites of manufacturers and organizations implementing LED products. There you can see the range transducer models, their technical characteristics and cost units.

Turning to the Site Manager you can get professional advice on how to pick up power supply for LED strip, depending on the type and operating conditions. Experienced specialists will help to select the correct device, which will provide long-lasting, high-quality work of the LED structure. As a rule, all products are certified and secured by a guarantee from the manufacturer.

Note!By purchasing an outdoor type of converter, remember that it can only be used in rooms with a minimum degree of humidity and in areas where the risk of water ingress.

Before you buy a power supply for LED strip, it is necessary to review the cost of the products offered by different companies. This will help in the selection of models with the required parameters on favorable terms. Estimated prices for LED power units 12B tapes are presented in the table:

inverter model	Dimensions, mm	Main settings	price, rub.
BP interior 12B 15W IP 20	70/39/30	Supply voltage 110-220V, 15W power, provided with a power indicator and a voltage regulator	270
PSU 12v 35w IP 20	85/58/32	Supply voltage 110-220V, 35W power, is the power indicator and a voltage regulator	380
PD 12B 60W IP 20	159/98/38	Supply voltage 110-220V, 60W power supply has a voltage regulator and indicator	540
PD 12B 150W IP 20	200/89/40	Supply voltage 110-220V, 150W power, provided with a power indicator and a voltage regulator	780
PSU 12V 30W waterproof IP 67	220/28/20	Supply voltage 110-220V, 30W power from moisture and dust protection	560
PSU 12V 60W waterproof IP 67	148/40/30	Supply voltage 110-220V, 60W power from moisture and dust protection	1100
Waterproof power supply 12V 100W IP 67	202/71,2/45	Supply voltage 110-220V, 100W power, from moisture and dust protection	1670

Sometimes there are situations when it is necessary to make the backlight for a small portion of the length. Then purchase the power supply will be much more expensive than buying the tape itself. In this case, you can make your own converter.

How to make a power supply for LED strip with your hands

Cost pulsed power supplies for high power LED tape is often superior to the very flexible tape. However, there is an option to reduce the cost of the backlight unit using as a stabilizing power supply units of outdated models of computers, TVs, tablets, or other electric devices. Surely such products can be found in every home.

Power converters 12B of old electronics is usually from 6 to 36W. It is enough for the operation of a small segment of the LED backlight, for example, kitchen apron area. You can use Transformer models, but they are heavy and their capacity exceeds same parameter tape twice. As a consequence, when connecting this power supply to the tape he strongly overheated, even with improvements in it by supplemental cooling device.

For normal operation of LED strip is better to use switching power supplies, which are at sufficient power to weigh very little. Suitable, for example, converter 12V and 2A from the failed set. The power of such a device is 24W (12x2) LED that allows the tape to work properly, but the power supply does not overheat.

Useful advice!Chargers from mobile phones 5V can be used as a power source for the assembled with his own hands a small night light from the LEDs 3-6.

It is possible to adapt an electronic ballast (the current limiter), which harbored luminaire, the failed under the power supply unit 12B for the tape. For this purpose a fluorescent lamp controller to convert a step-down transformer and then using circuit connected thereto LED tape. Transformation is a winding of the secondary winding, then is added secondary circuit diode and capacitor. The main condition is that the capacity of the tape must conform to the same parameter of the ballast.

Repair of the power supply for LED strip

Sources 12V voltage, defective, usually amenable to adjustment. If you have enough knowledge and skills, you can try the voltage converter repairs yourself. Faults can be eliminated from the power supply circuit for LED 12B tapes or 24B, as they are identical.

The most common problem with power supplies as follows:

• fail C22 capacitors C23 - usually observed their swelling or drying;
• T10-11 transistors do not operate;
• defective PWM controller TL494;
• dual diode D33, capacitors S30-33.

Faults other components converters are rare, but they are well worth checking out.

To diagnose and fix problems you must perform these steps:

• open the case and check fuse. If he's all right, you need to measure the voltage across the capacitor (C22, C23) previously energized. The value should be about 310B. Consequently, the rectifier and filter network is normal;
• diagnose PWM (KA7500 chip) - if there are 12 output voltage of 12-30V, then check the chip. Otherwise, check the power supply voltage on duty;
• voltage at terminal 14 after the external power supply must be set to approximately + 5V. If not - it is necessary to replace the chip. Ate there, you need to use the oscilloscope to test the chip.

Repair the power supply is to replace faulty items such as components or their equivalents. To subsequently deal with the problem of breakage, it is necessary to perform the manufacturer's recommendations, as the excess of the permissible load limit will lead to failure of the adapter.

The correct choice of power supply and related devices for LED systems guarantee durability and quality of light. With these devices, LED light sources emit bright, flicker-free light, capable of gracefully transform your interior.