The classification of LED power supply is mainly divided into two parts

by:MOSO     2020-03-02
The classification of LED power supply is mainly divided into two parts: 1. According to the driving mode, it can be divided into two categories 1. 1 The current output by constant current type a and constant current drive circuit is constant, while the output DC voltage changes within a certain range with the difference of load resistance value, and the load resistance value is small, the output voltage is low, and the greater the load resistance, the higher the output voltage; B, constant current circuit is not afraid of load short circuit, but it is strictly prohibited to load completely open circuit. C, constant current drive circuit is ideal to drive LED, but the price is relatively high. D, should pay attention to the use of * large withstand current and voltage value, it limits the number of LED use; 1. 2 voltage stabilizing type a. When various parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, while the output current changes with the increase or decrease of the load; B, voltage stabilizing circuit is not afraid of load open circuit, but it is strictly prohibited to load completely short circuit. C, drive LED with voltage stabilizing drive circuit, each string needs to add appropriate resistance to make each string of LED display brightness average; D, brightness will be affected by voltage changes from rectification. 2, according to the circuit structure Classification 2. 1 Resistance, capacitor step-down mode, through the capacitor step-down, in the use of flashing, due to the role of charge and discharge, the instantaneous current through the LED is extremely large, easy to damage the chip. It is easily affected by grid voltage fluctuation, and the power supply has low efficiency and low reliability. 2. 2 The resistor step-down mode, through the resistor step-down, is greatly disturbed by the voltage change of the power grid, and is not easy to be made into a stabilized power supply. The step-down resistor consumes a large part of energy, therefore, the power supply efficiency of this power supply mode is very low, and the reliability of the system is also low. 2. 3 conventional transformer step-down mode, the power supply is small in size, heavy in weight, and the power supply efficiency is very low, generally only 45% ~ 60%, so it is rarely used and has low reliability. 2. 4 Electronic transformer step-down mode, low power efficiency, voltage range is not wide, generally 180 ~ 240 V, large ripple interference. 2. 5 RCC step-down switching power supply has a wide voltage stabilizing range and high power efficiency, which can generally achieve 70% ~ 80%, the application is also wide. Since the oscillation frequency of this control mode is discontinuous, the switching frequency is not easy to control, the load voltage ripple coefficient is also relatively large, and the abnormal load adaptability is poor. 2. 6 PWM control mode switching power supply is mainly composed of four parts: Input rectifier filter part, output rectifier filter part, PWM voltage stabilizing control part and switching energy conversion part. The basic working principle of PWM switching voltage stabilization is that under the condition of input voltage, internal parameters and external load changes, the control circuit conducts closed-loop feedback through the difference between the controlled signal and the reference signal, adjust the pulse width of the main circuit switching device to make the output voltage or current of the switching power supply stable (That is, the corresponding regulated power supply or constant current power supply). The power supply efficiency is extremely high, generally 80% ~ 90%, stable output voltage and current. Generally, this kind of circuit has perfect protection measures and belongs to high reliability power supply. In addition, our company also sells power modules, switching power supplies and other products. Welcome to check the details! The performance and quality of the products and the perfection of the service are our endless pursuit. Please feel free to buy your favorite products. Shenzhen moso power supply Technology Co. , Ltd. looks forward to your call negotiation!
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