Switching power supply refers to the regulated power supply that the regulating tube works in the switching mode, i.e. on and off state, abbreviated as SPS (switching power supply). The core of switching power supply is a DC converter. Using DC converter, one kind of DC voltage can be changed into many kinds of DC voltage with different polarity and value.<br>The working process of the circuit shown in Fig. 2-1 is as follows: assuming the reference voltage is 5V, the input voltage will be reduced due to the fluctuation of the power grid, then the output voltage will be reduced, at this time, the sampled voltage will be reduced, assuming 4.9V , the error is 0.1V According to this error, increasing the duty cycle will increase the output voltage. Similarly, when the power grid fluctuates When the output voltage increases, the PWM circuit reduces the duty cycle to reduce the output voltage, so as to control the stability of the output voltage.<br>
正在翻译中..