Step-down cuk circuit with tapped inductance and large ratio

Abstract

The invention relates to a large-ration voltage-reduction Cuk circuit with tap inductors. The large-ration voltage-reduction Cuk circuit comprises an input direct-current voltage source, and is characterized in that a positive electrode of the input direct-current voltage source is connected with a first end of a first inductor, and a negative electrode of the input direct-current voltage source is grounded; a second end of the first inductor is connected with a first end of a second inductor and one end of an intermediate capacitor; the other end of the intermediate capacitor is connected with a first end of a third inductor and an anode of a diode; a second end of the third inductor is grounded; a second end of the second inductor is connected with one end of a power switch tube; the other end of the power switch tube is connected with a cathode of the diode, an anode of an output electrolytic capacitor and one end of a load; a control end of the power switch tube is connected with a PWM (Pulse-Width Modulation) control signal; and a cathode of the output electrolytic capacitor and the other end of the load are grounded. According to the large-ration voltage-reduction Cuk circuit with the tap inductors, the large-ratio voltage reduction of output voltage and input voltage can be realized through the coupling of the first inductor and the second inductor.

Description

technical field [0001] The invention relates to a non-isolated large-transformation-ratio step-down Cuk circuit, in particular to a large-transformation-ratio step-down Cuk circuit with tapped inductance for input and output voltages. Background technique [0002] With the extensive use of power electronic devices in the fields of aerospace, computers, remote data communications, household appliances, transportation and industrial control, and the rapid development of renewable energy systems, DC-DC Converters that can achieve high-quality power control have become Necessary and key technologies. [0003] DC converters can be divided into two categories: non-isolated and isolated. Non-isolated DC converters include: basic Buck (step-down) converter, Boost (boost) converter, Buck-Boost converter, Boost-Buck converter (Cuk converter); A compound converter composed of a combination of step-up DC converters. The isolated DC converter is formed by introducing an isolation tran...

AI Technical Summary

Problems solved by technology

However, most existing step-down circuits have disadvantages such as low conversion efficiency, large input and output ripple, and large EMI problems.

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