Views:101 Author:Site Editor Publish Time: 2020-03-16 Origin:Site
The adjustable switching power supply can convert the input AC power supply into DC power supply and then convert it into high frequency AC power supply through rectifier filter, thus providing transformer with voltage conversion, producing one or more sets of voltage required. The reason for converting to high frequency AC is that the efficiency of the converter circuit of high frequency AC voltage is much higher than that in low frequency circuit. Therefore, the volume of adjustable switch power supply is small, the cost is very low. At the same time, the heating value is smaller and the loss is less during the operation.
The working principle of the adjustable switching power supply is to change the input AC power supply into DC power supply through the rectifier filter. Through the high frequency PWM signal control switch, DC power supply is added to the primary pole of the switch transformer. The secondary pole of switching transformer inducts the high frequency voltage, which is provided to the load through rectifier filter, and the output voltage is fed back to the adjustable control circuit, and then the duty cycle of PWM is changed to realize the voltage output change.
The largest difference between adjustable switching power supply and switching power supply is that there is an autonomous auxiliary power supply inside the adjustable switching power supply, which supplies power to the chip separately, so that the chip can work independently and is not interfered by the output voltage. Therefore, the output can be adjusted.
The biggest characteristic of the switching mode power supply is that the output is constant and is commonly used for some equipment that needs constant voltage, such as a 12V input LED lamp. The advantages of using switching power supply to power supply to this kind of equipment are low price, stable output and easy installation. However, if there is a scene where multiple LED lights need to be installed, each LED lamp needs to be equipped with a switching power supply, which will be crowded and inconvenient to operate.
The adjustable switching power supply is characterized in that the output voltage and current can be adjusted, and the disadvantage of it is that the price is slightly higher compared with the switch power supply. Because the output voltage and current of the adjustable switching power supply can be adjusted, it is more convenient in operation. One adjustable switching power supply can be applied to a plurality of devices.
1、Electrolysis: In the process of electrolyzing water, a constant output current is needed. The adjustable switching power supply can provide the required constant output current, and at the same time, it can change the voltage according to the environment.
2. LED dimming: The change of the brightness of the LED lamp can be realized by adjusting the output voltage of the adjustable switching power supply.