Abstract
An active clamp boost converter with blanking time auto-tuned is presented herein, and this is implemented by an additional auxiliary switch, an additional resonant inductor, and an additional active clamp capacitor as compared with the conventional boost converter. In this structure, both the main and auxiliary switches have zero voltage switching (ZVS) turn-on as well as the output diode has zero current switching (ZCS) turn-off, causing the overall efficiency of the converter to be upgraded. Moreover, as the active clamp circuit is adopted, the voltage spike on the main switch can be suppressed to some extent whereas, because of this structure, although the input inductor is designed in the continuous conduction mode (CCM), the output diode can operate with ZCS turn-off, leading to the resonant inductor operating in the discontinuous conduction mode (DCM), hence there is no reverse recovery current during the turn-off period of the output diode. Furthermore, unlike the existing soft switching circuits, the auto-tuning technique based on a given look-up table is added to adjust the cut-off time point of the auxiliary switch to reduce the current flowing through the output diode, so that the overall efficiency is upgraded further. In this paper, basic operating principles, mathematic deductions, potential designs, and some experimental results are given. To sum up, the novelty of this paper is ZCS turn-off of the output diode, DCM operation of the resonant inductor, and auto-tuning of cut-off time point of the auxiliary switch. In addition, the efficiency of the proposed converter can be up to 96.9%.
Highlights
How to obtain a high-power density power supply is becoming more and more attractive in the world
In order to render the output voltage controlled at a desired value, the switching frequency is varied because the resonant time is fixed, causing the design of the filter to be difficult
As the active clamp circuit is utilized, the voltage spike on the main switch can be suppressed to some extent, whereas because this structure, the input inductor is designed in conduction mode (CCM), the output diode can operate with zero current switching (ZCS) turn-off, leading to the resonant inductor operating in discontinuous conduction mode (DCM), there is no reverse recovery current during the turn-off period of the output diode
Summary
How to obtain a high-power density power supply is becoming more and more attractive in the world. By increasing the switching frequency, the size of magnetic devices and capacitors can be reduced so that high-power density requirements can be achieved. The problem in high switching frequency is becoming more and more serious, thereby causing resonant and soft-switching converters to develop to reduce the switching loss. As the voltage on or current in the switch is dropped to zero, the switch is switched to achieve zero voltage switching (ZVS) turn-on of the switch or zero current switching (ZCS) turn-off of the switch. This method can reduce the crossover area of voltage and current of the switch, thereby decreasing the switching loss. In order to render the output voltage controlled at a desired value, the switching frequency is varied because the resonant time is fixed, causing the design of the filter to be difficult
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