Step-down DC-DC converter with continuous input and output currents

Abstract

A step-down DC-DC converter with continuous input and output currents comprises an inductor L1, a capacitor C1, a diode D1, a diode D2, an inductor L2, a capacitor Co and an electronic switch. The electronic switch is provided with a port a and a port b; one end of the inductor L1 is connected with the positive end of the direct-current power supply Vi; the other end of the inductor L1 is connected to both one end of the capacitor C1 and the port a of the electronic switch; the other end of the capacitor C1 is connected to both the anode of the diode D1 and one end of the inductor L2; the cathode of the diode D1 is connected to the port b of the electronic switch, one end of the capacitor Co and one end of the load Z, the other end of the load Z is connected to the other end of the capacitor Co, the anode of the diode D2 and the negative end of the direct current power supply Vi, and the cathode of the diode D2 is connected to the other end of the inductor L2. The step-down DC-DC converter has the following working characteristics: the input current and the output current are continuous, and the output voltage is less than or equal to the DC power supply voltage and has the same polarity.

Description

technical field [0001] The invention relates to a direct current-direct current (DC-DC) converter, especially a step-down DC-DC converter with continuous input and output currents and the same polarity of input and output voltages, which can be used as a basic unit to form multi-input and Multi-output DC power system, such as: DC power module parallel system, LED array drive system, distributed photovoltaic power generation system, etc. Background technique [0002] The existing basic DC-DC converters with step-down function include Buck converter, Buck-Boost converter, Cuk converter, Sepic converter and Zeta converter. As listed in Table 1, without considering the output capacitor, none of the above five basic DC-DC converters with step-down function satisfies the requirement of "continuous input and output currents and the same polarity of input and output voltages". Require. [0003] [0004] Table 1. Contents of the invention [0005] In order to overcome the def...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing basic DC-DC converters with step-down function do not meet the requirement of "continuous input and output currents and the same polarity of input and output voltages", the present invention provides a step-down converter with continuous input and output currents. Compression-type DC-DC converter, which can realize continuous input and output current and the same polarity of input and output voltage, expanding the types of DC-DC converters

Images