Quadratic‐boost‐double‐flyback converter

Abstract

Combining low-voltage power sources with loads that require high-voltage levels is a challenge, especially for power devices above 500 W. In this context, this study presents a new dc-dc high-gain converter using coupled inductors. The new converter uses only one switch and output capacitors with low values. It also allows the use of energy from the leakage inductors and enables the input current to operate in the continuous mode. The experimental concept validation was carried out in a prototype of 1 kW with an input voltage between 48 and 96 V and an output voltage of 800 V. The results obtained were coherent, with no significant semiconductor over-voltage and high efficiency was achieved for a wide power range.

Non‐isolated DC–DC converter with cubic voltage gain and ripple‐free input current

“…The voltage gain of the converter used in [28] is dependent on the number of stackable switching stages. In the other converters presented in [23–25], the voltage gain depends on the turns ratio of the CIs. Notably, without using CIs, the proposed C 3 BC yields the highest voltage gain at safe duty ratio values.…”

“…The resultant converter is termed as quadratic boost converter (QBC) which yields a voltage gain that is square of the CBC's voltage conversion ratio [21]. To further enhance the voltage gain capability of the QBC, simple inductors are replaced by CIs and gain extension cells are also introduced in [22–26].…”

“…The converter presented in [23] uses the basic QBC structure with CIs and snubber circuit to reduce the voltage stress on the main switch. The converter presented in [24] offers an excellent voltage gain of about 16 and operates at 1 kW power level. However, the input current is pulsed.…”

Double boost‐flyback converter

“…Due to the advantages, many studies are being carried out [24][25][26][27] and new topologies are being developed based on boostflyback converters [28][29][30][31][32][33][34][35].…”

Ultra‐high gain DC‐DC converter based on interleaved quadratic boost converter with ripple‐free input current

“…Though the voltage gain of the converter is only 4, the voltage stress on the capacitor is significantly reduced 20 . Higher voltage conversion ratios are obtained using the QBC structure by (a) stacking gain extension cells in the QBC, 21,22 (b) employing coupled inductor based QBC 23 and (c) integrating CI‐based QBC with other gain extension mechanisms 24‐26 . By employing voltage lift technique within the IBC and adjusting the turns ratio of CI, a voltage gain of more than 15 is obtained 24 .…”