Buck DC Converter

Abstract

The invention relates to a voltage reducing type direct current converter. According to the voltage reducing type direct current converter, when a first switching tube is powered on, an input power source charges for a first inductor and a first resistor; when the first switching tube is powered off and a second switching tube is powered off, the first inductor continues current through a third second diode and charges the first resistor; when the second switching tube is powered on, conduction of the second switching tube achieves zero voltage switching, the first inductor and the first resistor discharge to the second resistor through the second switching tube and a first diode to achieve voltage output due to the fact that the second switching tube keeps a conduction state; when the second switching tube is powered off, a second inductor which continues current through a second diode charges to the second resistor to achieve voltage output; when the first switching tube is powered on, conduction of the first switching tube achieves zero voltage switching. The voltage reducing type direct current converter has the advantages of achieving the zero voltage switching, improving the voltage conversing efficiency and reducing electromagnetic interference.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a step-down DC converter. Background technique [0002] With the development of electronic technology, the power conversion frequency of the power switch tube in the voltage conversion circuit is getting higher and higher. For the occasion where the power switch tube is used for circuit switching, the switching loss is generally very large, and strong electromagnetic interference will be generated. [0003] Existing non-isolated step-down circuits such as figure 1 shown in figure 1 In this case, the device is in a hard switching state. When the switch is turned on or off, the voltage at both ends of the switch changes greatly instantaneously, resulting in serious electromagnetic interference and large switching loss, which affects the power conversion efficiency. Contents of the invention [0004] An embodiment of the present invention provides a step-down DC converter to re...

AI Technical Summary

Problems solved by technology

[0003] Existing non-isolated step-down circuits such as figure 1 shown in figure 1 In this case, the device is in a hard switching state. When the switch is turned on or off, the voltage at both ends of the switch changes greatly instantaneously, which leads to serious electromagnetic interference and large switching loss, which affects the power conversion efficiency.

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