Abstract: This paper introduces a new soft-switching Boost converter. Conventional Boost converters will generate switching losses when turned on and off, thus reducing the efficiency of the overall system. The new Boost converter uses a soft switching method to add an auxiliary switching transistor and a resonant circuit. Thus, the converter reduces switching losses compared to hard switching. Such a converter can be used in devices such as photovoltaic systems, power factor correction, and the like. Detailed analysis of the working principle of the circuit and the conditions for implementing the soft switch, using Pspice 9.2 software for simulation verification. The simulation results show that all the switching devices of the converter implement soft switching, which improves the efficiency.
Key words: boost circuit; soft switching; resonant circuit; power factor correction
0 Introduction In recent years, as the switching frequency has increased, the switching power supply has become lighter, but the switching frequency is proportional to the switching loss, the switching frequency is increased, and the switching loss is also increased, thereby increasing the switching loss of the overall system. Many converters use resonance to reduce switching losses, but the auxiliary resonant circuit increases the complexity of the circuit and also increases the cost of the circuit. In some resonant converters with auxiliary switches, the main switching tube implements a soft switching, but the auxiliary switching tube still operates in a hard switching state. Therefore, due to the presence of auxiliary switch tube switching losses, these converters do not improve the efficiency of the overall system.
The traditional Boost converter has been widely used in boosting applications due to its simple structure and easy implementation. In photovoltaic power generation systems, the output voltage of photovoltaic array cells is relatively low, and a large boost is urgently needed to meet the needs of the latter inverters. In order to improve the conversion capability, adjustable range and efficiency of the converter, the conventional Boost converter is improved. In this paper, a new soft-switching Boost converter is proposed. The soft switching of the main and auxiliary switching tubes is realized by adopting the circuit structure of the auxiliary switching tube and the resonant circuit. Compared with other soft-switching converters, at the same frequency, both switching losses are reduced and overall system efficiency is improved. In this paper, the working principle of this converter is analyzed in detail, and the conditions of soft switching are realized and simulated by PSpice.
1 low loss soft switch Boost converter
1.1 Circuit topology Low loss soft switching Boost converter is shown in Figure 1.
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