Capacitor type rectifying and step-down voltage regulator circuit

Abstract

The invention discloses a capacitor type rectifying and step-down voltage regulator circuit. In the process of alternating current rectification, by utilizing the controllability of a self-turnoff device and the unilateral conductivity of diodes, a first capacitor composes serial charging via a charging diode and a second capacitor. When alternating-current voltage is lower than the voltage of the second capacitor, both ends of a blocking diode generate driving voltage for the self-turnoff device to drive the self-turnoff device to turn on, and the first capacitor carries out parallel charging on the second capacitor; and when output voltage reaches a required value, a voltage regulating control circuit controls the self-turnoff device to turn off in order to obtain stable direct-current voltage output used by an electricity-consuming load. Thus, the process of alternating current-to-direct current voltage-regulated transformation is simplified, and the purpose of utilizing the capacitors for rectification and step-down voltage regulation is achieved. The capacitor type rectifying and step-down voltage regulator circuit has the advantages of simple structure, low cost, high efficiency, high power factor and the like, and breaks through the bottleneck that the service life of the inductor type switching power supply is short due to high switching frequency.

Description

technical field [0001] The invention relates to a capacitor-type rectifying and step-down voltage stabilizing circuit, in particular to a rectifying and step-down voltage stabilizing circuit for alternating current by controlling capacitors using power electronic technology. Background technique [0002] With the development of electronic technology and the popularization of electronic products, the DC regulated power supply, which is an indispensable power supply for electronic products, is more and more widely used. The existing methods of converting alternating current to direct current are roughly divided into two types. One is that the alternating current is first transformed to the required voltage by a transformer, and then rectified and filtered, and then stabilized; the other is that after the alternating current is rectified, the The switch transforms it into a higher frequency alternating current, and then successively transforms it through a transformer or induct...

AI Technical Summary

Problems solved by technology

Although the first conversion method is simple in structure, the transformer is large in size, low in efficiency and power factor, which brings inconvenience to use; the second conversion method uses a transformer and inductor with high conversion frequency to reduce the circuit volume, but There are electromagnetic harmonics and pollution generated by high-frequency conversion, and this method uses secondary rectification, which reduces conversion efficiency

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