Abstract
A new topology of the high frequency alternating current (HFAC) inverter bridge arm is proposed which comprises a coupled inductor, a switching device and an active clamp circuit. Based on it, new single-phase and threephase inverters are proposed and their operating states are analysed along with the traditional H-bridge inverter. Multiphase and multi-level isolated inverters are also developed using the HFAC bridge arm. Furthermore, based on the proposed HFAC, a front-end DC-DC converter is also developed for photovoltaic systems to demonstrate the application of the proposed HFAC converter. Simulation and experimental results from prototype converters are carried out to validate the proposed topologies which can be utilised widely in high frequency power conversion applications such as induction heating and wireless power transfer.
Highlights
High frequency alternating current (HFAC) systems are widely applied for induction heating [1], aerospace [2], vehicles [3], microgrids [4][5], power distribution systems [6]-[8], telecommunication [9], computer power supplies [9] and medium/high voltage gate driving systems [10] owing to their merits of simple transforming structure, low cost and low component count, and effective ground noise isolation [10]
Resonant topologies can include the asymmetrical pulse-width-modulated (APWM) resonant inverter, which is constructed with two power switches [15][16]
This paper has presented a group of novel high-frequency inverters integrated with the coupled inductor bridge
Summary
High frequency alternating current (HFAC) systems are widely applied for induction heating [1], aerospace [2], vehicles [3], microgrids [4][5], power distribution systems [6]-[8], telecommunication [9], computer power supplies [9] and medium/high voltage gate driving systems [10] owing to their merits of simple transforming structure, low cost and low component count, and effective ground noise isolation [10]. A common topology for single-phase systems is the H-bridge [2] [see Fig. 1(a)], which is refers to as the full bridge [10] or the buck inverter [11]. A single-switch resonant inverter topology is proposed in [14] to use LC resonance for AC signal generation. A coupled inductor bridge arm is integrated in them to achieve soft switching, electrical isolation, and structural flexibility. Their effectiveness is validated by experimental tests on a 400-W prototype. The leakage inductances are LLK1 and LLK2, for L1 and L2, respectively
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