How does a LED driver circuit work?

LED power output voltage

  There are two standard voltages on the market, 12VDC, and 24VDC, of which 24VDC to say more. This is mainly related to the series-parallel circuit of your LED strip beads. If you are a series circuit with three dots, that drive voltage 12VDC is six beads, that drive voltage is 24V, of course, the circuit to add a current limiting resistor—power supply problems caused. Specific reasons may have the following.

  1, power supply damage, probably due to poor performance due to design reasons, can not work for a long time, and finally the control IC, MOS tube, and other damage.

  2, the fuse is bad. This situation may be due to the output short circuit, instantaneous high current, resulting in damage to the fuse.

  3, the circuit of the internal output of the power supply is faulty.

led driver power supply output voltage_led driver power supply matching

LED driver power supply features

High reliability

  Especially like the LED streetlight power supply, installed at high altitude, maintenance is not convenient, and maintenance costs are also high.

High efficiency

  LED is an energy-saving product, the efficiency of the drive power supply should be high. For the power supply installed in the lamps and lanterns junction, heat dissipation is essential. High efficiency of the power supply, its power consumption is small, the heat generated in the lamps and lanterns is small, also reduces the temperature rise of the lamps and lanterns. Beneficial to slow down the light decay of LED.

High power factor

  Power factor is the power grid requirements for the load. General 70 watts or less of appliances, there are no mandatory indicators. Although the power of a small single appliance power factor is a little lower on the grid, the use of lighting at night, the same kind of load is too concentrated, will produce more severe pollution. For 30 watts to 40 watts of LED drive power supply, it is said that shortly, perhaps there will be specific indicators of power factor requirements.

Drive mode

  There are two prevailing: one is a constant-voltage source for multiple constant-current sources, each constant-current source separately to each road LED power supply. This way, the combination of flexible, one LED failure does not affect the work of other LEDs, but the cost will be slightly higher. Another is the constant-current power supply, the drive method used by “Zhongke Huibao,” LEDs in series or parallel operation. It has the advantage of lower-cost but poor flexibility, but also to solve a LED failure, does not affect the operation of other LEDs. These two forms, over some time and co-exist. Multiple constant-current output power supply methods in terms of cost and performance will be better. Perhaps the mainstream direction in the future.

Surge protection

  LED anti-surge capability is relatively poor, especially the ability to resist reverse voltage. Strengthen this aspect of protection is also very important. Some LED lights are installed in the outdoors, such as LED street lights. Due to the power grid load and lightning induction, the power grid system will invade various surges. Some surges will lead to damage to the LED. Therefore, the analysis of “Zhongke Huibao” drive power in the surge protection should have a certain lack of energy and frequent replacement of lamps. LED drives power to inhibit the intrusion of surges to protect the LED from damage to the ability.

Protection function

  Power supply and the conventional protection function, it is best to increase the LED temperature negative feedback in the constant current output to prevent the LED temperature is too high; to meet the requirements of safety regulations and electromagnetic compatibility.

LED power supply matching

  First, we need to know the matching principle of LED lamp beads.

  1, LED lamp beads only know their rated current to determine the specifications of the driving power supply.

  2, because the LED is not a constant voltage driver, it is a regular current driver.

  3, according to the rated current of a single LED, the number of LEDs, LED connection (series, parallel) determines the drive’s total current and total voltage to choose the matching power supply.

  Second, the calculation of LED lamp beads and power supply.

  Calculate the power supply power according to the power of LED beads. Such as 5 mm straw hat-shaped, 5 mm spotlight type, 3528 packages, etc. about 0.06W, medium power (such as 8 mm straw hat-shaped, 10 mm straw hat-shaped, 5050 packages, etc.) 0.2W-0.5W, high-power 1W, 3W, 5W, 10w … 100w.


Ena Leung

Ena Leung

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