A new cascaded high step-up DC-DC converter

Abstract

This paper proposes a new soft switching high step-up DC-DC converter .The proposed converter is a kind of quadratic boost converter with the coupled inductor. The converter provides high step-up voltage gain with proper duty ratio and low switch voltage stress. Additionally, the stored energy in the leakage inductor of the coupled-inductor can be recycled to the output capacitor. In this converter an auxiliary circuit consist of one auxiliary switch and clamp capacitor is used for providing ZVS condition for all switches (switch and an auxiliary switch), and also the main switch is turned off under almost ZVS due to snubber capacitor. Also the proposed convertercontrolled by PWM signal, and so the implementation of control circuit is simple. To confirm the performance of the proposed converter, this converter is simulated by PSPICE.

New Single‐Switch quadratic boost DC/DC converter with Low voltage stress for renewable energy applications

“…It is noteworthy that, the energy stored in the leakage inductor of the CI leads to a high voltage spike on the switching components. This problem can be alleviated by using clamp capacitors (active or passive) in parallel with the switch [4, 5]. It can be pointed out that the passive clamp circuit is simpler than an active clamp circuit and has almost no effect on the control system.…”

“…However, the mentioned converter can reach an ultra‐high voltage gain with the use of a large number of semiconductor components. In [5, 12] new quadratic high step‐up DC‐DC converters with active clamp capacitors are suggested. In these converters using three magnetic cores, soft switching conditions are achieved.…”

Very high voltage step-up Integrated Quadratic-Boost-Zeta converter

“…In boost converter because of high DC output, there are high conduction losses; also one of the other problems is diode reverse recovery in this converter [9]. To improve the high step up, the use of DC-DC converters is cascade is an effective way, since the gain of each converter cell is multiplied resulting in a large voltage gain accounting from the first through the last converter cell [10].…”

A KY Converter Integrated with a SR Boost Converter and a Coupled Inductor

“…However, there are too many switches, some of which need floating gate drivers instead of half-bridge gate drivers. In [25], a soft-switching step-up converter, using an auxiliary circuit with zero voltage switching (ZVS), is presented. Although the converter can achieve a high output voltage, the output current is pulsating, which makes the output voltage ripple relatively large.…”

“…These voltage-boosting techniques include coupled inductors [11]- [15], switched capacitors [16]- [24], cascaded structures [25], [26], a voltage multiplier [27], and so on. In [11], a non-isolated step-up converter based on a flyback converter is presented to achieve a high voltage gain.…”