What is the driving voltage and driving current of high power and low power LEDs

The high power is generally 1W Red 2V 330mA Green. Blue. White 3v 330mA

The low power operating voltage is the same, just the current is at 20mA. Understood, no.

This is not specified, depending on your requirements, the general high power is more than 350ma, and the small power is generally dozens of milliamps.

High-power single branch 1W voltage current 350mA.

LED is a current type device, and the driving mode is best to drive with constant current, and the driving voltage is only higher than the conduction voltage of the LED (generally the on-voltage of the white LED is between). Commonly used LED lamps are 30mA, 100mA and 300mA with 1W driving currents. The current can be appropriately smaller, which is beneficial to prolong the life of the LED, and never exceed the rated current of the LED.

The power of the LED driver is a range value. The DC residual voltage of the current sensor increases with the increase of the rated current of the driver, so the choice of high-power driver to drive the low-power servo motor (horse-drawn trolley) will produce unnecessary torque fluctuations and cause fluctuations in speed.

In terms of the number of series connections of high-power LEDs, the current flowing through high-power LEDs is no longer limited by the number of series connections of high-power white LEDs. In order to meet different luminous brightness requirements, this can be achieved by flexibly driving multiple high-power LEDs. For the parallel use of high-power white LEDs, the circuit still cannot guarantee the consistency of luminous brightness of the parallel branch LEDs.

It is a range value, and the high-power drive power supply can not carry a low-power load, because your low-power load does a good job of the finished fixed voltage input, generally (12V, 24V, 220V). And the power output of your high-power drive power supply itself is unlikely to be the same as the required parameters of low-power power. In addition, the high-power driving power supply should also take into account your lamp bead connection, such as a 28W high-power lamp, the general power supply is required to be 7 strings of 4 parallel, each lamp bead power supply is, the power supply of each lamp bead is 350mA (4 * 350 = 1400mA), that is to say, the output voltage of this drive power supply is about volts, and the output current is ampere.

It's not universal.

LED drivers need to be paired with different LED lights to be used, so not all LED light drivers are universal. Now the most complete types of LED lights on the market are also very complete, so once the bulb is broken, it must need to be replaced.

There is also a problem when replacing, that is, because the LED lamp driver is connected to the power supply and the lamp body together, so many LED lamps are not broken bulbs, but the driver is broken, at this time, you need to separate the lamp body and the driver, and directly replace the driver.

Segments can be generic. A small amount of variation is allowed.

For example, this driver, from 8 watts to 24 watts of power of the light board can be universal, if necessary, appropriate small or large can also be used, but can not reach the ultimate use conditions, or a little impact on the lamp beads, or let the light a little weakened.

The LED light is faulty, and the fault is eliminated after changing the driver, but the brightness is significantly reduced, is it a mismatch between the drivers? Is it too much power or too little?

There are many models of LED driver power supply, and they are not standardized, and in addition, the parameters of different LEDs are not the same, so they cannot be generalized.

You can divide the voltage and current parameters of the LEDs you use by dividing them by the voltage and current parameters of the LEDs you use according to the voltage and current parameters marked at the output of the driving power supply, and get the number of LEDs that must be used in series in a single branch (the minimum number of LEDs) that must be used in series for a single branch, and the maximum number of such branches that can be connected in parallel to determine the maximum number of LEDs that can be driven (the minimum number of LEDs in the branch). The number of LEDs that can be driven in actual use is a multiple of the minimum number of LEDs between the minimum and the maximum, and it is not necessarily possible to increase one by one (unless the output voltage is equal to the driving voltage of the LED).

The parameters of ordinary straw hat type high-brightness LED are that if the output parameter of the driving power supply is 10V, the max (maximum) is 2A (i.e., 2000mA). Then, 10V, that is, 3 such high-brightness LEDs need to be connected in series before they can be directly connected to the power connection point at the output end of the drive power supply (although it is also possible to use 1 LED in series with a resistor of appropriate resistance to access the circuit, but generally do not do this unless necessary).

2000mA 20mA 100, that is, 1 branch formed after the above 3 LEDs are connected in series, the power supply capacity of the driving power supply, can drive up to 100 such branches in parallel (total number of LEDs, number of branch LEDs, number of branches, number of branches, 3 100 300).

In actual use, 1 100 branches can be connected according to the need, and the number of LEDs that can be driven corresponds to one, which can be seen to increase in multiples of 3 (the number of LEDs connected in series in a single branch).

LED is a current type device, the LED driving current of different power for lighting is also very different, can not directly add a DC voltage to the LED, it is easy to burn out, to connect a current limiting resistor, the resistance of different resistance values adjusts the size of the current, so as to supply the current suitable for the LED.

At present, there is no unified standard for LED drivers, and it is difficult to say in a word, and the finished lamps have manufacturers supporting the production of constant current source specifications, and the variety is very complex. Get a drive to be used in strict accordance with the manufacturer's requirements, otherwise it will cause irreparable losses. The specifications of common lighting LED lamp beads on the market can be roughly divided into five categories; A low-power lamp bead with a working current of 18mA.

Two 160mA working current of medium power lamp beads. 3. 1W high-power lamp beads with 350mA working current. Four 700mA working current of 3W high-power lamp beads.

5. The integrated module lamp beads integrated by the above specifications through series and parallel, of which 1W and monomer are the majority, and the most common is 1W integrated into 5W10W20W100W and other specifications through series and parallel. To know how many lamp beads a constant current source can drive (for example, a single string) depends on the output voltage compared to the voltage of a single lamp bead. The 50V constant current source can be equipped with 15 lamp beads (50 The current parameter is constant, designed with a multiple of the lamp beads of a certain specification, if 1W is designed according to 330mA, the constant current source of 1A can be connected in parallel with 3 1W lamp beads.

1000 330 = If this constant current source is 50V1A, then you can bring 45 1W lamp beads. I think you've figured it out a bit.

According to his string and order, there is nothing usually said.

How much current value should be taken for LED high-power driving current is a science1To know the size and luminous efficiency of the chip.

2.It is necessary to know the way of chip bonding and the material of the die bonding glue used3It is important to know the phosphor application method and material parameters.

4.It is necessary to know the heat dissipation area of the heat sink fin and the thermal conductivity of the material 5It depends on what kind of lampshade is used for the light source and the environment in which it is used.

The thermal conductivity and heat dissipation system is well done, the chip luminous efficiency and size are correct, and the 1W LED lamp bead can be used up to 350mA.

Current rating. If these links are not ideal or unclear, it is necessary to reduce the constant current value to ensure that the LED light decay is not too fast.

The driving power supply is generally constant current, generally to see how much the rated current of the lamp bead to be driven is, and multiply 70%-50% on the basis of this current to determine the appropriate driving current. Also look at the output voltage, whether the input voltage of the driver is in line with the external voltage, the voltage of the driven LED string is within the allowable output voltage range of the power supply, and so on.

300 is better and can prolong the service life. When the current is large, the temperature of the LED will rise, and the result will be that the LED light decays quickly, or even burns out.

In fact, the key is to do a good job of heat dissipation, if the heat dissipation is good, the current can be slightly larger, of course, it is also related to the quality of the LED.

99% of the LED driver power supply is constant current, and the output current is related to the LED lamp, such as: 1W lamp is about 330mA, 3W lamp is about 700mA

The output voltage of the drive power supply is related to the connection between the power and the lamp, such as: 3X1W output voltage is about 12V, the current is about 330mA, the output voltage is about 5V, and the current is about 700mA.

Types of LED drive power supplies: isolated, non-isolated, capacitive voltage drop, resistor voltage drop. Among them, the isolation is the best (output constant current constant voltage), the other is constant pressure is not constant current, or constant current is not constant pressure.

The output voltage is designed according to the load (number of LED beads). From more than 200 V and so on.

There are constant pressure, constant current, and constant current constant pressure. There are many types of three voltages, the common ones range from 5V to 12V, and there are also higher voltages.

The maximum output voltage of the LED constant current drive power supply is the no-load voltage. The maximum output voltage of a standard drive power supply can be known by measuring its no-load voltage.

The maximum output power is the maximum power that can maintain a constant current when the external voltage varies to the full voltage (85 265V) or the nominal voltage range of the drive source. To detect this parameter, use a dummy load (adjustable electronic load), adjust the load size so that the output voltage of the drive power supply can reach the maximum voltage under the condition that the constant current value is within the allowable range, and then adjust the input voltage in the full voltage range to verify once. In this case, the maximum voltage obtained is multiplied by the constant current value, which is the maximum output power of the driving power supply.