Street lamp power source: zhongshan lighting engineering co. , LTD. , release date: 2020 -
04 views: electronic completely for the previous work, our company make the street lamp power and important to value the summary of the article, on the principle of street lamp power supply, the classification of the LED street lamp power supply, the main points and make a detailed explanation and analysis principle of LED street lamp power LED switching power supply is a circuit to control the switch tube, high-speed road and globe.
Is the direct current into high frequency alternating current (ac) for converter transformer, make its produce one or more sets of voltage needed!
Into the reason of high frequency alternating current (ac) is a high frequency ac in the transformer circuit efficiency is higher than the mains frequency 50 hz or 60 hz.
So very small switch power transformer can be done, at the time of switch power supply is not very hot, the product is lower than power frequency dc regulated power supply.
If you don't turn 50 hz or 60 hz into high frequency electric, switching power supply doesn't make any sense.
Switching power supply can be divided into isolation and not isolate the two, is to isolate type must be a switch power converter, without isolation may not have switching power supply converter.
Compared with traditional dc power supply switch power supply has small volume, light weight, and the classification of higher efficiency LED street lamp power supply, according to the drive mode can be divided into two categories: 1.
1 a and constant current constant flow drive circuit of the output current is constant, and the output of dc voltage is as the load resistance of different size changes within a certain range, load resistance is small, the output voltage is low, the greater the load resistance, the higher the output voltage.
B, does not fear the load constant current circuit short circuit, but it is forbidden to load completely open.
C, led constant current drive circuit drive is ideal, but relatively high.
D, use should be paid attention to withstand current and voltage, it limits the use of the LED quantity;
2 voltage type a, when the voltage regulation circuit, to determine the various parameters of the output voltage is fixed, and the output current is as the load increase and decrease and change;
B, regulating circuit are not afraid of open load, but it is forbidden to load completely short circuit.
C, with voltage driving circuit to drive the LED, each string need to add the appropriate resistance can make average a string of LED display brightness;
D, brightness will be affected by rectification of voltage change.
2 2, according to the circuit structure mode classification.
By capacitance step-down, resistor, capacitor step-down mode in flashing when using, as a result of the action of charge and discharge, through the LED current is great, easy to damage the chip.
Vulnerable to the influence of power grid voltage fluctuation, low power efficiency and low reliability.
2 resistance step-down way through resistance step-down, by the interference of power grid voltage change is bigger, it is not easy to make it regulated power supply, step-down resistance consumes a large part of energy, so this way of electricity power efficiency is very low, and reliable of the system is also lower.
Three conventional power transformer step-down way lay particular stress on weight, small size, power efficiency is low, usually only 45% ~ 60%, so general rarely used, the reliability is not high.
4 way electronic transformer step-down power efficiency is low, also not wide voltage range, general 180 ~ 240 v, moire interference.
5 RCC step-down mode switching power supply voltage range is wide, power efficiency is higher, generally can be 70% ~ 80%, is widely used.
Due to this kind of control mode of oscillation frequency is discontinuous, switching frequency is not easy to control, load voltage ripple coefficient is big, abnormal load adaptability is poor.
6 PWM control mode switching power supply is mainly composed of four parts, the input rectifier filter parts, the output rectifier filter, PWM voltage stability control part, switch part of energy conversion.
The basic principle of PWM switching voltage stabilizer is changes in input voltage, the parameters of internal and external load, the control circuit by the control signal and reference signal difference of closed loop feedback, adjust the main circuit switching device turn-on, the pulse width of the makes switch power supply output voltage or current stability (
The corresponding manostat or constant current power supply)
High power efficiency, generally can be 80% ~ 90%, the output voltage and current is stable.
Generally this circuit has perfect protection, high reliability of power supply.
Choice of LED street lamp power supply, the first point.
According to choose a suitable load control mode of the LED street lamp power supply various types of LED street lamp power now in the market to sell, is increasingly powerful, the performance of the LED street lamp power supply is becoming more and more become the speed regulating performance determinants, in addition to the LED street lamp power supply itself 'congenital' conditions of manufacturing process, what kind of control mode to the LED street lamp power supply is also very important.
In recent years was reviewed in the table below the performance characteristics of all kinds of LED street lamp power control mode.
Above all, choose different control method of asynchronous motor frequency conversion control, regulating performance can get different performance characteristics.
The second point.
Selected according to the installation environment protection structure of LED street lamp power supply protection structure of LED street lamp power supply should be compatible with its installation environment, this is about to consider the environment temperature, humidity, dust, factors such as ph, corrosive gas, and this LED street lamp power supply can be important long-term, safe and reliable operation.
Lighting, outdoor landscape lighting area, is a good addition to the beautiful China!
Engineering lighting service calls: related tags: street lamp power supply