Ultra-wide input DC step-down circuit

Abstract

The invention belongs to the technical field of circuit electronics, and relates to a novel ultra-wide input DC step-down circuit. The novel ultra-wide input DC step-down circuit comprises a BUCK structure basic circuit, a voltage stabilizing circuit, a charge pump circuit, a constant current load circuit, a voltage and current acquisition circuit, a constant-voltage constant-current control circuit and a power supply management circuit, wherein the input end of the power supply management circuit is connected to the input end of a power supply and the constant-voltage constant-current controlcircuit; the output end of the power supply management circuit is connected to the input end of the voltage stabilizing circuit and the input end of the BUCK structure basic circuit; the output end of the voltage stabilizing circuit is connected to the electric input end of the constant current load circuit through the charge pump circuit; the output end of the voltage stabilizing circuit is alsoconnected to the input end of the constant-voltage constant-current control circuit; the output end of the BUCK structure basic circuit is respectively connected to the input end of the constant current load circuit and the input end of the voltage and current acquisition circuit; and the output end of the voltage and current acquisition circuit is connected to the input end of the constant-voltage constant-current control circuit. The step-down circuit is wide in input direct-current voltage range and capable of achieving automatic switching of the constant voltage and constant current.

Description

technical field [0001] The invention belongs to the technical field of circuit electronics, and more specifically relates to a novel ultra-wide input DC step-down circuit. Background technique [0002] Direct current: refers to the current that does not change in magnitude and direction with time. Many electrical appliances, such as radios, speakers and many other electrical appliances without inductive components, are driven by direct current. It is divided into positive and negative poles, and the voltage cannot be changed by using a transformer, so it is used in low-voltage electrical appliances. Electric appliances using dry batteries fall into this category. [0003] Alternating current: Alternating current refers to the current whose size and direction change periodically with time. The usual alternating current changes according to the law of sine or cosine. The current first changes from zero to maximum, and then from maximum to zero. Then change from zero to maxi...

AI Technical Summary

Problems solved by technology

And quite a lot of electronic devices can't directly use the AC power provided by the grid, but need a stable DC power supply. Therefore, the requirements for the performance, volume, and weight of the DC power supply are also continuously increasing. The input voltage of the existing step-down circuit smaller width

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