led driver chip principle LED control card built-in high-performance single-chip LED driver chip led driver chip , the controller through the internal control program to the LED driver chip to send control signals and data, LED driver chip according to the control signal and data requirements, produce the corresponding action, Thus, each red, green and blue LED can be controlled separately. If the microcontroller continuously sends control signals and data to a series of LED driver chips, each LED can be continuously coordinated control.
It usually consists of three parts:The power management circuit is responsible for converting the power supply into the voltage and current required by the LED. The protection circuit provides protection for the LED to prevent overcurrent, overvoltage and short circuit. The control circuit provides PWM (pulse-widthmodulation) or its led driver chip he controls the way to adjust the brightness of the LED. Generally speaking, the led driver chip can control a single or multiple leds. There are also driver chips that can control multiple leds.
It works by converting the input current into a fitThe current and voltage of LED lamp operation. Specifically, the LED driver chip is usually composed of two parts: the power supply part and the control part. The power supply part is responsible for converting the input voltage into the voltage and current suitable for the work of the LED lamp, while the control part is responsible for adjusting the size of the current according to the need to control the brightness of the LED lamp.
Its working principle is to use the control circuit inside the circuit to control the size of the output current, so that the LED lamp produces different brightness output. The circuit design of the LED driver chip is generally composed of the following parts: Input voltage control: This part is responsible for stabilizing the input voltage, andEnsure that the driver chip can work properly. Control circuit: This part is responsible for controlling the brightness of the LED lamp, and the output current can be adjusted according to the demand.
The working principle of the led driver ic: the chip contains a constant current generation circuit, which can set the output constant current value through an external resistor. The switch time of the output channel can be controlled through the enable side of the chip, and the switching frequency is up to one megahertz (1mhz). The current output response is extremely fast, supporting applications with high color level changes and high picture refresh rate. Built-in open circuit detection, overheat outage, and overcurrent protection greatly improve the reliability of the application system.
2, led light driver maintenance method led Driver chip : Purchase the same type of driver, replace the lamp bead, and replace the led lamp overall. Buy the same type of driver we can first replace a led light power driver, for this power adapter, we can buy the same type, and then the left and right connected wires removed, and then replace the drive up, and then try whether it can be normally lit. Replacing the lamp bead is followed by replacing the lamp bead.
3, therefore, it is recommended that the driver power supply and the lamp board be replaced as a whole.
4, led light driverThe machine is generally not a professional, it is recommended not to repair yourself. First, the chip material identification of the drive power supply of LED lamps is not good, resulting in difficult to find electronic materials; Second, non-professionals may aggravate the fault, resulting in damage to the LED light source, causing unnecessary losses; Third, the driving power cost of LED lamps is not very high, usually the same specification parameters can be replaced.
5, method/Step 1 First, let's understand what is the LED lamp, the basic structure of the LED lamp is a piece of electronic light-emitting semiconductor material, is a solid-state semiconductor device,It can directly convert electricity into light, placed on a shelf with a lead, and then sealed around with epoxy resin to protect the internal core, so the LED lamp has good seismic performance.
2, IC multiple protection functions, including LED open circuit protection, LED short circuit protection, chip overtemperature protection, overvoltage protection, undervoltage protection and FB short circuit protectionEscort. In DIP-8 package. The most cost-effective power IC, the cost is less than 4RMB.
3, if the microcontroller continuously sends control signals and data to a series of LED driver chips, the LED can be continuously coordinated control. The desired change effect can be converted into the data format and appropriate control instructions that can be processed by the LED controller, and then continuously sent to each LED driver chip, so that the overall LED display can show the desired effect.
4, the driver chip generally plays a driving role, well, that is, the input weak signal amplified into strong enough,Strong electrical signals suitable for external devices require ampere-level driving currents generally to drive motors or power electronic devices, etc.
Its working principle is to use the control circuit inside the circuit to control the size of the output current, so that the LED lamp produces different brightness output. The circuit design of the LED driver chip is generally composed of the following parts: Input voltage control: This part is responsible for stabilizing the input voltage and ensuring that the driver chip can work normally. Control circuit: This part is responsible for controlling the brightness of the LED lamp, and the output current can be adjusted according to the demand.
led driver chip principle LED control card built-in high-performance monolithic LED driver chip, controller through the internal control program to the LED driver chip to send control signals and data, LED driver chip according to the control signal and data requirements, produce the corresponding action, so as to achieve separate control of each red, green, 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.
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, constant pressure drive. LED displays used to be constant voltageWith the development of technology, constant voltage drive is gradually replaced by constant current drive. Constant current drive. Constant current start solves the harm caused by the inconsistent internal resistance of each LED tube core constant voltage drive is caused by the different current through the resistance. At present, the LED display is basically driven by constant current. Constant current drive can be divided into static constant current drive.
3, multi-channel drive circuit: Advantages: can independently control multiple LED lamp beads, to achieve color and brightness adjustment. Disadvantages: The circuit is complex and the cost is high. Constant voltage drive circuit: Advantages: can provide a constant voltage output, suitable for multiple series LED lamp bead drive. Disadvantages: For series LED beads, additional current limiting circuitry is required. In general, the choice of LED street light driver circuit should be determined according to actual needs.
4, pulse drive Many LED applications require dimming functions, such as LED backlighting or building 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 light, but allowing the LED to work under the rated current will cause many adverse consequences, such as color problems.
5, 1General IC manufacturers can produce such chips. Since the LED is a current characteristic device, that is, under the premise of saturation conduction, its brightness changes with the change of the current size, not with the change of the voltage at both ends. Therefore, one of the biggest features of the dedicated chip is to provide a constant current source. The constant current source can ensure the stable drive of the LED and eliminate the flicker phenomenon of the LED. The following will focus on the LED display of the dedicated driver chip.
6, in the field of LED lighting, due to power requirements usually need to drive multiple LED lights, which requires a special drive circuit to achieve. At present, the mainstream L in the marketThere are several ED drive methods: First, the resistance and capacitance step-down method is a common drive method. It provides DC power by limiting the current through the impedance of the capacitor at AC. This scheme is simple in structure and low in cost, but there are security risks because the input is not isolated.