A New High Step-Down Zero Voltage Switching DC–DC Converter With Low Output Current Ripple Suitable for Voltage Regular Module or LED Driver

Abstract

This article proposes a new high step-down converter which, on the input side, there are two series switches. The coupled inductors are used to decrease voltage gain, but on the output side of the proposed converter, two independent inductances are placed and act like interleaved, which cause to decrease output current ripple. Soft switching condition is provided for all semiconductors in the proposed converter. As described, considering the structure of the proposed converter, the converter has two switches, which is the minimum switch used in this structure. Also, the switches do not impose complexity to the converter in terms of control, because these switches are controlled complementary each other. In the structure of the proposed converter, the minimum semiconductor elements are used, which include two switches and three diodes; this design makes the conduction loss of the proposed converter low and achieves higher efficiency. A sample laboratory of the proposed converter is implemented to verify theoretical analysis, which the experimental results are presented in 300 W power with 320 V input voltage and 24 V output voltage. In this test, an efficiency of about 94.6% is achieved.