What is the relationship between the output voltage of the switching power supply and the PWM signal?
Hello, the output voltage of the switching power supply and the number of turns of the transformer, as you said the PWM is only control IC and MOSFET composition, PWM is "chopped" the input DC voltage cut into amplitude equal to the input voltage amplitude pulse Voltage to achieve. And the duty cycle of the pulse is regulated by the controller of the switching power supply. Once the input voltage is cut into an alternating square wave, its amplitude can be raised or lowered by the transformer. By increasing the number of secondary windings of the transformer, the number of output voltage groups can be increased. Finally, these AC waveforms are rectified and filtered to obtain the DC output voltage. Can be abstractly understood as the PWM is the middle process, as to the number of output voltage can be changed by the number of turns, of course, and efficiency is also related. Hope to help you!
Brother ~ ~ give you advice ~ ~ power problem is not so good ~ ~ ~
Switching power supply output voltage is controlled by the PWM duty cycle to achieve the adjustment ~ When the pulse width, duty cycle increases, the output voltage increases, otherwise ~ ~
First of all, what is your circuit topology? Is BUCK, or isolated rebirth is it?
Different circuits, the answer to your question is different.
However, a large range can be explained as such. The larger the PWM duty cycle, the stronger the output load. (That is, the output voltage * the greater the output current.)
You better, or look for the corresponding topology of your circuit information, find the formula, so good to understand some.
