Switching Mode Power Supply

Abstract

The invention relates to a switching-type power supply unit which is used for supplying a stable voltage output for a load. The switching-type power supply unit includes a rectifying circuit, a flyback voltage conversion circuit and a non-isolation voltage adjustment circuit. The rectifying circuit receives AC signals and rectifies and then outputs the AC signals. The flyback voltage conversion circuit is electrically connected with the rectifying circuit and used for converting the rectified AC signals into DC signals. The non-isolation voltage adjustment circuit is electrically connected between the flyback voltage conversion circuit and the load and used for eliminating voltage ripples of the DC signals and then outputting the DC signals to the load. Thus setting of a high-voltage capacitor in front of the flyback voltage conversion circuit is not needed and the volume and material cost of the switching power supply unit can be reduced significantly.

Description

technical field [0001] The invention relates to a power supply, in particular to a switching power supply capable of suppressing output ripple. Background technique [0002] With the progress of the times, electronic products have been widely used in human life, but the problem of energy shortage is becoming more and more serious, making people pay more and more attention to the use efficiency of electronic products. Most electronic products need to use AC / DC converters to convert the AC power in the power system into the DC power required by electronic products, so it is necessary to extensively discuss and study various low-cost and high-efficiency AC / DC converters . [0003] Today's AC / DC conversion is mostly achieved by diode rectification. Although this method is cheap, simple and robust, due to the serious nonlinear distortion of the input current, the low-frequency harmonics increase a lot, resulting in too low a power factor (PowerFactor) and an increase in virtual ...

AI Technical Summary

Problems solved by technology

However, in regions where the mains power is relatively unstable (for example: Southeast Asia), the capacitor C in the step-up power factor corrector 910 needs a higher withstand voltage, so as to prevent the circuit of the adapter 900 from being damaged due to the instability of the input voltage. , but the volume of the high withstand voltage capacitor C (usually an electrolytic capacitor) is too large, and the cost is high because the electrolytic capacitor is relatively rare

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