Abstract
In this paper, first the operating principles of a non-isolated universal bidirectional DC-DC converter are studied and analyzed. The presented power converter is capable of operating in all power transferring directions in buck/boost modes. Zero voltage switching can be achieved for all the power switches through proper modulation strategy design, therefore, the presented converter can achieve high efficiency. To further improve the efficiency, the relationship between the phase-shift angle and the overall system efficiency is analyzed in detail, an adaptive phase-shift (APS) control method which determines the phase-shift value between gating signals according to the load level is then proposed. As the modulation strategy is a software-based solution, there is no requirement for additional circuits, therefore, it can be implemented easily and instability and noise susceptibility problems can be reduced. To validate the correctness and the effectiveness of the proposed method, a 300 W prototyping circuit is implemented and tested. A low cost dsPIC33FJ16GS502 digital signal controller is adopted in this paper to realize the power flow control, DC-bus voltage regulation and APS control. According to the experimental results, a 12.2% efficiency improvement at light load and 4.0% efficiency improvement at half load can be achieved.
Highlights
The energy crisis has recently become an important issue
Renewable energy sources are susceptible to weather factors which result in unstable power supply and unpredictable power generation
Energy storage devices such as batteries are often applied in renewable energy generation systems
Summary
The energy crisis has recently become an important issue. To solve this, the development of renewable energy is essential. In [30,31], a novel low loss modulation strategy with simple circuit configuration is proposed The advantages of these systems include high efficiency, no additional cost and a simple structure. Various efficiency enhanacement techniques regarding adaptive or control under light-load condition to reduce the circulating loss of phase-shift full-bridge converter. Fxed-frequency phase-shifted pulse width modulation and these approaches mainly focus on the improvement of light-load efficiency only These phase-shifted gate signals control based onmethods; predetermined optimal duty ratio are used are to regulate the on-line. The power flow control, dc-bus voltage regulation and APS control are implemented using improvement of light-load efficiency only These techniques are all multi-mode control a low cost dsPIC33FJ16GS502 digital signalare controller.
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