Studies on a Hybrid Full-Bridge/Half-Bridge Bidirectional CLTC Multi-Resonant DC-DC Converter with a Digital Synchronous Rectification Strategy

Abstract

This study presents a new bidirectional multi-resonant DC-DC converter, which is named CLTC. The converter adds an auxiliary transformer and an extra resonant capacitor based on a LLC resonant DC-DC converter, achieving zero-voltage switching (ZVS) for the input inverting switches and zero-current switching (ZCS) for the output rectifiers in all load range. The converter also has a wide gain range in two directions. When the load is light, a half-bridge configuration is adopted instead of a full-bridge configuration to solve the problem of voltage regulation. By this method, the voltage gain becomes monotonous and controllable. Besides, the digital synchronous rectification strategy is proposed in forward mode without adding any auxiliary circuit. The conduction time of synchronous rectifiers equals the estimation value of body diodes' conduction time with the lightest load. Power loss analysis is also conducted in different situations. Finally, the theoretical analysis is validated by a 5 kW prototype.

A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid

“…Although this control technique is simple and can be implemented in digital controllers, the complexity of the power section in comparison with nonisolated topologies is higher. On the other hand, until now, several control techniques have been applied for the control of the basic topologies of nonisolated DC-DC converters, the majority of them operating with a constant switching frequency obtained by means of pulse width modulation (PWM) [27][28][29]. Another group of controllers corresponds to techniques operating with a variable switching frequency, such as sliding mode control (SMC) and model predictive control (MPC).…”

A Novel Multi-Element Resonant Converter with Self-Driven Synchronous Rectification

“…Moreover, when the LLC resonant converter is used during start-up condition, the huge inrush current will cause destructive damage. Moreover, how to optimize driving synchronous rectifiers (SR) is still an important issue [14][15][16]. For instance, the current transformer (CT) to sense the current used to drive SRs has been proposed [17], but the magnetizing inductance of the transformer of the LLC resonant converter has been used for resonant inductance.…”

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