Abstract
A soft-switching interleaved topology is presented herein and applied to the boost converter. The basic operating principle is that the main power switches are turned on at zero voltage and turned off at zero current via the same auxiliary resonant circuit whose switch is turned on from zero current. Furthermore, as compared to the traditional boost converter, the proposed topology has three additional auxiliary diodes, two additional auxiliary capacitors, one additional auxiliary inductor, and one additional auxiliary switch. On the other hand, since the interleaved control is adopted herein, the difference in current between the two phases exists. Hence, the cascaded control is utilized to regulate the output voltage to the desired voltage via the first phase, whereas the current-sharing control, based on half of the input current as the current reference for the second phase, is employed so as to make the load current extracted from the two phases as evenly as possible. In this paper, the effectiveness of the proposed topology and control strategy is demonstrated by some experimental results.
Highlights
The traditional switching power supply operates under hard switching
Based on an auxiliary inductor connected in series with the switch, this inductor will oscillate with the parasitic capacitor during the turn-off period, and, as soon as the voltage across the parasitic capacitor resonates to zero, the switch will be turned on
The switching loss is reduced based on zero-voltage switching (ZVS) or zero current switching (ZCS) or both, high resonant voltage stress or high resonant current stress is generated so as to select proper components, thereby increasing the corresponding circuit cost
Summary
The traditional switching power supply operates under hard switching. due to the parasitic components, large electromagnetic interference and high switching loss will happen the instant the switch is turned on/off. As the active clamp technique is applied to the non-isolated power converter [31], one auxiliary inductance, one auxiliary capacitance, and one auxiliary switch are used to form a resonant loop, and, during the resonant period, the soft switching of the main switch and auxiliary switch can be achieved Via this way, the voltage stress on the main switch is reduced in addition to the switching loss. Based on what has been discussed above, a two-phase converter with one resonant inductor, two resonant capacitors, two resonant diodes, one auxiliary diode, one auxiliary switch, and two main switches are proposed This converter can achieve ZVT and ZCT for the main switches and ZCS for the auxiliary switch, so as to further increase the overall efficiency. The proposed current-sharing control is adopted so that the output voltage is regulated by the first phase and the current sharing between the two phases is controlled by the second phase
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