1, linear constant current driver IC, is the constant current chip led lamp, all circuits, nothing more than resistance, capacitance, inductance, and some of the two triode composition. Constant current is mainly driven by constant current IC, constant current means constant current, generally in the case of input voltage changes, the input current remains unchanged.
2, most of their constant current LED driver ics are based on constant current, such as: DD311, DD313, etc., are linear constant current ics.
3, linear constant current is a basic circuit composition in electronics, which mainly refers to the adjustment of the current in the circuit by controlling the impedance, so as to maintain a constant current output state. Corresponding to this, there is also a nonlinear constant current output mode, which realizes the current regulation by controlling the voltage, but due to the nonlinear characteristics of the component, the output current is not stable and easy to fluctuate.
4, from the perspective of the drive program, the LED filament power supply is divided into three categories: resistance and capacitance voltage reduction; Linear constant current; IC constant current. From the structural point of view, the LED filament power supply is divided into two categories: allScans are 1/2, 1/4, 1/8, and 1/16. If the drive circuit lights up the pixels composed of all the LED lights on the screen each time, it is called static drive.
3, LED driver according to the driving mode, can be divided into constant flow, voltage regulator. The current output of the constant current drive circuit is constant, not afraid of load short circuit, but it is strictly prohibited that the load is completely open, which is the ideal driver type for LED, but the price is relatively high. The voltage of the voltage regulator output is fixed, not afraid of the load open circuit, but it is strictly prohibited that the load is completely short-circuited, and each string needs to be combined with the appropriate resistance to make each string of LED display brightness average.
4, constant voltage drive/This drive is like a spotlight on the stage, maintain a stable voltage output, suitable for those who need to maintain a constant brightness, but the number of LED loads (such as panel lights or downlights) changes. Its precise control makes everything shine. Constant current drive/Constant current drive is the master of dimming on the LED stage, ensuring that each LED lamp bead can get the ideal current supply, even if their forward voltage drop is different.
1, in the LED driver chip drive solution, there are two common types: constant current drive! -- and constant pressure drive! --. In practice, constant current drives are usually set under the limit of the maximum output current. Let's delve into the features, strengths and weaknesses of both drives, and the differences between them. Constant current drive! - is characterized by a constant circuit output current, even in the face of load short circuit, can protect the LED from damage.
2, DOB is to put the LED constant current Driver source driverTo the aluminum substrate, this technology has been available as early as 5 years ago, of course, at that time not called DOB but called light engine. The two names are very different, DOB said is a method or practice, is to put the drive power on the aluminum substrate, and the light engine is a new product name, all LED aluminum substrate with constant current drive source is called the light engine.
3, constant pressure drive. LED display was previously driven by constant voltage, with the development of technology, constant voltage drive is gradually replaced by constant current drive. Constant current drive. Constant current start solves the problem of constant voltage drive caused by inconsistent internal resistance of each LED tube core through resistanceThe harm caused by different currents. At present, the LED display is basically driven by constant current. Constant current drive can be divided into static constant current drive.
4, simple current drive circuit: Advantages: simple structure, low cost, suitable for small power LED street lights. Disadvantages: Constant current output cannot be guaranteed, and the life and brightness control of the LED is not precise enough. Constant current drive circuit: Advantages: can provide a constant current output to ensure the brightness and life stability of the LED. Disadvantages: The circuit is complex and the cost is high.
QX6103 is a high-precision buck type high-power LED constant current driver chip. Output current can reach more than 3A. The chip adopts the patent linear constant current driver chip high-end current detection, fixed frequency, current mode PWM control mode linear constant current driver chip , with excellent linear adjustment rate and load adjustment rate. Chip built-in frequency compensation and slope compensation Linear constant current driver chip , no external compensationPay. QX6103 also integrates the linear constant current driver chip buffeting function to improve the EMI characteristics of the system.
LED street light constant current power supply composition Linear constant current driver chip Electronic components are divided into active components, passive components and mechanism parts active components constant current driver IC This is the core component of generating constant current power supply, using PWM (wave width)The principle of control digitizes the power square wave, and then manages the duty cycle of the power square wave according to the information from the signal source, so as to keep the output current constant.
EG1000EA constant current chip through voltage detection, pulse width modulation and other technologies, to achieve the linear constant current driver chip accurate control of the output current, to provide a stable current source for LED lamps.
The principle of LED constant current drive is to ensure that the LED can maintain a stable current value when working, so as to ensure that the light efficiency of the LED is stable and stableLong service life. In the constant current drive circuit, the current is controlled by adjusting the resistance in the circuit to achieve the purpose of constant current output. When the power supply voltage changes, the resistance is adjusted accordingly to keep the current flowing through the LED constant.
By sampling the output current as negative feedback. The constant current step-down chip adopts the control mode of peak current detection and fixed turn-off time, and forms the stable operation of the whole working loop by sampling output current as negative feedback. It is a LED linear step-down constant current driver with low static current and low voltage difference.
led constant current circuit originalThe principle of LED constant current circuit is to control the current of the LED by controlling the resistance in the circuit, so as to achieve a constant current. When the current of the LED exceeds the set current, the resistance in the circuit automatically increases, thereby limiting the current of the LED and keeping it at the set current level. When the current of the LED is lower than the set current, the resistance in the circuit will automatically reduce, thereby increasing the current of the LED, so that it is maintained at the set current level.
led driver chip principle LED control card built-in high-performance monolithic LED driver chip, the controller through the internal control program to the LED driveThe dynamic chip sends control signals and data, and the LED driver chip generates corresponding actions according to the requirements of the control signals and data, so as to achieve separate control for each red, green and blue LED. If the microcontroller continuously sends control signals and data to a series of LED driver chips, each LED can be continuously coordinated control.
led linear constant current driver chip series products, the output current is adjusted through the external resistorSection, and does not change with the output port voltage, with negative temperature coefficient and overheat protection function. The chip can share the PCB board with the LED to realize the unity of the wick. The SM2087 system does not require a high-voltage input electrolytic capacitor to achieve a power factor greater than 0.98, a THD less than 20%, and an efficiency greater than 90%. In addition, the SM2083 supports infrared, voice control and other dimming applications.
SM220X series is a linear constant current driver chip for external drive MOS (4OOO 336 5I8), suitable for 200Vac~240Vac or 110Vac~130VacInput, support PWM dimming, or support wall switch dimming or color palette and other schemes. SM2212/3E is a series of LED linear constant current driver chips that support multi-stage dimming/color tuning. In practical applications, there is no need to replace the existing line, and the brightness/color temperature is adjusted using the switch control of the original wall. It is suitable for 220V, 110V input voltage range.