High boost ratio DC–DC converter with ripple‐free input current

Abstract

A high boost ratio non-isolated converter with a ripple-free input current is proposed, which combines a zero-ripple boost cell and a coupled inductor to achieve a high output voltage step-up. A passive snubber is utilised to suppress voltage spike of the switch caused by the resonance of the leakage inductance of the coupled inductor and the parasitic capacitance of the switch. Therefore, a low-voltagerated metal oxide semiconductor field effect transistor (MOSFET) with low r DS(ON) can be used to improve the efficiency of the converter. In addition, a ripple-free input current can be achieved, making the electromagnetic interference (EMI) filter simple. Experimental results of a 100 W (40 V/200 V) prototype are presented to verify the analysis results of the proposed converter.

A Coupled-Inductor DC-DC Converter with Input Current Ripple Minimization for Fuel Cell Vehicles

“…The specific comparisons are shown in Table 1. The voltage stress across the diode D1 was larger than the output voltage in the converter of Reference [29], while the voltage stresses across all semiconductors in the proposed converter were less than the output voltage. Moreover, the proposed converter could achieve a much higher voltage gain at the cost of one more diode and one more capacitor.…”

“…The proposed converter was compared to the converter in Reference [29] without considering the influence of leakage inductance. The specific comparisons are shown in Table 1.…”

“…Reference [29] Proposed converter When the power switch Q is turned off, the currents flowing into C 1 , C 2 , C 3 , and C 4 are I C1off , I C2off , I C3off , and I C4off ; the current flowing into L a is I Laoff ; and the currents flowing into both sides of the ideal transformer are I npoff and I nsoff . I LMoff is the current flowing into L M , and the current flowing into L r is I Lroff .…”

“…Based on the step-up DC-DC converter with an input current ripple minimization proposed in Reference [29], a novel coupled-inductor converter with a high voltage gain is proposed in this paper. The converter benefits from input current ripple minimization, further improves voltage gain, and reduces voltage stresses.…”

“…The operating principles and characteristics of the converter are analyzed in Section 3 in detail. In Section 4, the voltage and current stresses of the semiconductors are analyzed, and a comparison to the counterpart in Reference [29] is made. In Section 5, an experimental prototype is built, and experimental results validate the theoretical analysis.…”