A wide voltage input converter and its control method

Abstract

The invention discloses a wide voltage input converter, which comprises: an input terminal; a potential energy converter, the potential energy converter is an inductor or a transformer; a control unit, the control unit includes a first switch tube and a second switch tube , the first diode, the second diode; the input end, the potential energy converter, the first switching tube, and the second switching tube are electrically connected to form a first loop; the input end, The potential energy converter, the first switch tube, the first diode, and the Vcc capacitor are electrically connected to form a second loop; the potential energy converter is electrically connected to the second diode and an output capacitor to form a The third loop and the corresponding control method enable VCC to obtain energy at any time, so that the capacity of the input high-voltage capacitor is reduced or removed, so that the overall volume of the converter is smaller, the cost is lower, and the life is longer.

Description

A wide voltage input converter and control method technical field The present invention relates to the field of power supply circuit technology equipment, in particular to a converter and control of a wide voltage input method. Background technique In the field of existing power adapters, in order to obtain a stable output, the power supply on the market generally needs to be at the input end. After rectification, an electrolytic capacitor is added, and the added electrolytic capacitor causes the volume of the power supply to become larger, and also affects its own service life. had a certain impact. If the long-life capacitor with small capacity is used or the capacitor is removed, due to the large fluctuation range of the input voltage, So that the input voltage is low in the valley stage, and according to the on-time T=L*△I / U, the on-time will increase linearly, so that all The required drive capacity is increased. The conventional power supply is charged duri...

AI Technical Summary

Problems solved by technology

The traditional power supply is charged during the demagnetization stage or the demagnetization stage. During this period, the conduction energy consumption is the largest, but during this period, the Vcc capacitor cannot be continuously supplied with energy, and the fluctuating voltage requires more energy to drive the switch tube to work during the low voltage period. , and then turn off the switch tube due to insufficient drive in the low-voltage stage, so that the output energy decreases and the output fluctuation fluctuates greatly

[0003] For example: the time to reach IPK in the low-voltage stage becomes longer, and the demand for driving current is large, resulting in insufficient Vcc power supply

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