LED driver power supply, LED light driver power supply

This IC I've used to do small power.

It's like this, the principle of the original control -- about the range of output voltages -- goes something like this.

Since the number of turns of your secondary and primary windings is set.

Then the operating voltage range of the IC.

If the turns ratio is 2 then your output voltage range is between 15V and 29V (provided that the other protections are not operating).

You can work backwards if you have a string of beads, then the voltage is u0 divided by your turns ratio and wait until a voltage u1

If U1 is within the operating voltage range of the IC.

Then you can.

Otherwise, the IC is acting because of overvoltage and undervoltage.

Detailed principles can be together**.

LED is a current type, and controlling the current is quite loud in the whole field, when the current and transformer are unchanged, there is no point in calculating the voltage in the ideal state.

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No.

Most LED power supplies are constant current sources, that is to say, the output current of the power supply is constant, and the voltage varies within a certain range. If a 3W power supply is used to drive a 5W lamp, the lamp will not reach normal brightness because the power supply will have a constant current at 3W working current. If it is the other way around, it is possible to burn the lamp.

Generally, the output parameters of the constant current source will be marked with the output current and output voltage range, and the output current can be multiplied by this range to get a power, observe whether the lamp used is within this power range, and then observe whether the working voltage of the lamp is not within the output voltage range. If both values are present, the power supply is ready to use.

The analysis is as follows:

It's better not to bai. Most of the LED power supply DU is constant.

The output current of the power supply is constant, while the voltage of the electric plate varies within a certain range. If you use a 3W power supply to drive a 5W lamp, the lamp will not reach normal brightness because the power supply will keep the current at 3W working current.

If it is the other way around, there is a risk that the lights will be burned. Generally, the output parameters of the constant current source will be marked with the output current and output voltage range, you can multiply the output current by this range, you will get a power, see if the lamp you are using is not within this power range, secondly, and then see if the working voltage of the lamp is not within the output voltage range.

If both values are present, the power supply is ready to use. 3W5W is just an example, some constant current sources can be universal. It's like a high-power one, but it can't. For small power, such as 3W, the general working voltage is around. And 100W, around 33V.

It's better not to. Most of the LED power supplies are constant current sources.

Since, that is, the output current of the power supply is constant, while the voltage varies within a certain range. If a 3W power supply is used to drive a 5W lamp, the lamp will not reach normal brightness because the power supply will have a constant current at 3W working current. If it is the other way around, there is a risk that the lights will be burned.

Generally, the output parameters of the constant current source will be marked with the output current and output voltage range, you can multiply the output current by this range, you will get a power, see if the lamp you are using is not within this power range, secondly, and then see if the working voltage of the lamp is not within the output voltage range. If both values are present, the power supply is ready to use. 3W5W is just an example, some constant current sources can be universal.

It's like a high-power one, but it can't. For small power, such as 3W, the general working voltage is around. And 100W, around 33V.

This way, 1Your adapter is constant voltage 12VDC output, the voltage of each LED is 3V, you are 4 in a string, 3*4=12V is just right.

2.In terms of power, you have each LED = 3V*, and your maximum output of this adapter has 12V*5A=60W, so it can also be in power.

Of course, it is best to add a current-limiting resistor to each string of LEDs, that is, a 10 ohm resistor of 1 4W plug-in, or a 10 ohm resistor of 0805 1206, to each string of 4 LEDs.

3. The LED does not emit light normally, because the voltage of 12V is just right, which is too ideal, and the current through the LED is low. Of course, the use does not affect.

Okay. There is a small problem, that is, the voltage of each LED lamp is just 3V, and the current of each should only be about 15mA at this time, and the brightness of the lamp does not reach the standard state. If you measure the total current, it should only be a little over 60mA.

The white LED actually needs to be about the right to reach the rated current of 20mA

There is no adverse effect on the LED, the lower the current, the lower the brightness, and the longer the life of the LED.

This design is not possible, the current borne by each parallel branch is about 5 4 = , in fact, this branch is only 20mA is enough, (because the current in the same series circuit is the same, so the lamp beads of each parallel branch can be regarded as a lamp bead, so each parallel branch only needs 20mA current) The total current of 4 parallel branches 4 * 20 = 80mA is enough, your total current is 5A, the current is too large to burn out the lamp beads, and the voltage of 12V is OK.

Missing components. In fact, the power supply fluctuates, and the load also fluctuates, so it is recommended that you leave a margin when designing. It is not guaranteed that the LED is bright.

Therefore, to add a current limiting resistor, there must be a !! In each way), it is also best to add protection loops (such as fuses, etc.) to the back and front of the adapter

At the same time, it is necessary to consider the manufacturing dispersion of LEDs, so try to use a constant current source instead of a constant voltage source.

Absolutely not, your current is not counted, right!

Even if you are told the correct connection, your LED light won't last long!

Because: your AC adapter is not a constant current power supply, but a constant voltage power, which has a great impact on the LED!

Definitely not going to burn soon, or not bright enough.

The method of using 3 strings and then stringing resistors is correct.

LED light driver is a converter that converts the power supply into a specific voltage and current to drive the LED to emit light.

When buying a drive power supply, you need to pay attention to whether it has an IC control chip, because the IC control chip has protection functions against short circuit, overvoltage, overload, overtemperature, etc. As long as these two points are in place, the quality is already very good.

Many LED applications require dimming capabilities, such as LED backlighting or architectural lighting dimming. The dimming function can be achieved by adjusting the brightness and contrast of the LED. Simply reducing the current of the device may be able to adjust the LED emitting light, but allowing the LED to operate below the rated current can have a number of undesirable consequences, such as chromatic aberration problems.

The alternative to simple current regulation is to integrate a pulse-width modulation (PWM) controller in the LED driver. The signal from the PWM is not used directly to control the LED, but rather to control a switch, such as a MOSFET, to supply the required current to the LED. PWM controllers typically operate at a fixed frequency and adjust the pulse width to match the desired duty cycle.

Most of the current LED chips use PWM to control LED light, in order to ensure that people do not feel the obvious flickering, the frequency of the PWM pulse must be greater than the main advantage of the control is that the dimming current of PWM is more accurate, minimizing the color difference when LED emitting light.

It is possible to use the adapter to drive, but after the voltage of the constant voltage source is constant, the voltage drop of this series parallel mode has been fully calculated, and the work is carried out within the equal voltage value, and the voltage fluctuation during the duty cycle will cause the lamp to flash.

There should be no adverse effects.

Pick it up like this? Well, congratulations on becoming the new LED killer!

You turn two of the strings in reverse.

The LED driver power supply is generally a switch-type constant current source, which is specially designed according to the characteristics of the LED, no matter how the load changes, it only outputs the specified current, so that the LED will not be damaged due to current overage.

LED drive power supply is to convert the power supply ** into a specific voltage and current to drive the LED light converter, usually the input of the LED drive power supply includes high-voltage power frequency AC (i.e., mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformer), etc. The output of the LED driver power supply is mostly a constant current source that can change the voltage with the change of the forward voltage drop value of the LED.

Circuit diagram and schematic diagram of LED light driver for 220V power input:

Classification by drive type.

1) Constant current type.

The output current of the constant current drive circuit is constant, and the output DC voltage changes within a certain range with the size of the load resistance, the load resistance is small, the output voltage is low, and the larger the load resistance value, the higher the output voltage;

The constant current circuit is not afraid of short circuit of the load, but it is strictly forbidden to completely open the load;

The constant current drive circuit is ideal to drive the LED, but relatively speaking, it is higher;

Attention should be paid to the maximum withstand current and voltage values used, which limit the number of LEDs that can be used.

2) Voltage stabilized.

When the parameters in the voltage regulator circuit are determined, the output voltage is fixed, and the output current changes with the increase or decrease of the load;

The voltage regulator circuit is not afraid of open circuit of the load, but it is strictly forbidden to completely short circuit the load;

The voltage regulator drive circuit is used to drive the LED, and a suitable resistance needs to be added to each string to make the brightness of each string of LEDs appear average; Brightness is affected by the voltage variation from rectification.

Resources.

LEDs have a small power LED with only 0A few watts, as well as high-power LEDs, there are 1W, 3W, 5W, etc.

If it is a low-power LED, it needs a lot of lights to shine together to achieve the purpose, in that case, there are only two ways to do constant current, but there are disadvantages, one is that all lamps are connected in series to do high-voltage constant current, so that as long as a lamp is broken, the whole is not lit; The other is to divide into many strings, and each string does a constant current drive, which is too expensive. Therefore, in this case, a constant voltage is generally done and then the current is limited with a resistor.

If it is a high-power LED, generally only a few lights are used in series, and it is best to use constant current to drive it.

Solar drive is nothing more than switching to solar energy instead of low energy.

Although these drivers are different in power, performance, and parameters, the general principle is the same. The main factor for the purpose of this division is also the result of the use of the same thing. This is because it is difficult to interchange the drive power supply that is not in use.

You can go to the power supply network to see, there is a special LED driver column.

LED Driver Power Supply (LED

DrivePower) well-known brands include Laidian Technology, Xinchuangming Electronic Technology, etc.

The efficiency of the LED driver power supply is high, generally up to 90.

LED drive power supply is to convert the power supply ** into a specific voltage and current to drive the LED light converter, usually the input of the LED drive power supply includes high-voltage power frequency AC (i.e., mains), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformer), etc.

An LED driver converts a power supply** into a voltage converter that converts a specific voltage current to drive the LED light emitting light

The input of LED drive power supply includes high-voltage power frequency AC (i.e., mains), low-voltage DC, high-voltage DC, low-voltage and high-frequency AC (such as the output of electronic transformers), etc.

The output of the LED driver power supply is mostly a constant current source that can change the voltage with the change of the forward voltage drop value of the LED. The core components of LED power supply include switching controllers, inductors, switching components (MOSFETs), feedback resistors, input filter devices, output filter devices, etc.

According to the requirements of different occasions, there are also input over-voltage protection circuits, input under-voltage protection circuits, LED open-circuit protection, over-current protection and other circuits.