Automatic switching step-down circuit

Abstract

An automatic switching step-down circuit is characterized in that two input ends PB8 and PB9 are respectively connected with base electrodes (B) of triodes Q4 and Q3 through two current-limiting resistors R10 and R11, collector electrodes (C) of the triodes Q4 and Q3 are respectively connected with G electrodes of MOS (Metal Oxide Semiconductor) tubes Q6 and Q5, D electrodes of the MOS tubes Q6 and Q5 are respectively connected with a socket J1 through diodes D2 and D1, and meanwhile, a connecting wire is led out to be connected with a light-emitting diode H1. By using the circuit for automatic switching (high and low), the load damage can be reduced, the use efficiency is improved, the current can be gradually reduced during use, the conduction and switching time can be controlled through a program, and components cannot be damaged due to the magnitude of the current and the magnitude of the voltage; and through the design of the automatic switching circuit, electronic components cannot be burnt out, and the circuit cannot be damaged due to the fact that the components are damaged.

Description

technical field [0001] The invention relates to the field of power switching equipment, in particular to an automatic switching step-down circuit. Background technique [0002] With the demand for power electronic products and the development of semiconductor technology, the importance of integrated circuits (ICs) in power electronic products is increasing, and their applications in switching power supplies and other fields are becoming more and more extensive. Buck (BUCK) type direct current-direct current (DC-DC) converters continue to pursue high performance, high efficiency and low power consumption. [0003] When performing AC switching, DC switching or switching of power supply and distribution equipment, due to factors such as high load voltage and large current, equipment heating caused by long-term work is prone to occur, which in turn leads to problems such as loss of electronic components, resulting in The life of the equipment is reduced, and the cost of mainten...

AI Technical Summary

Problems solved by technology

[0003] When performing AC switching, DC switching, or power supply and distribution equipment switching, due to factors such as high load voltage and large current, it is easy to cause equipment heating due to long-term work, which will lead to problems such as loss of electronic components, resulting in The life of the equipment is reduced, which virtually increases the cost of maintenance or replacement. Therefore, it is necessary to design a high-low level switching working circuit to reduce energy consumption.

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