Abstract
In this work, a unidirectional full-bridge resonant converter with secondary-side phase-shifted control is addressed. With the variation of voltage gain and power level, this converter may enter into different operational modes, including three continuous current modes and one discontinuous current mode. The details in each operation mode are discussed one by one. The boundary conditions between these modes have been identified. Additionally, the steady-state analysis of all continuous current modes is performed uniformly by using the fundamental harmonics approximation approach. Experimental results based on a lab prototype converter are also included to verify the operation modes predicted by the theoretical analysis.
Highlights
Phase-shift modulation is a widely-used control method in power converters, especially in the bridge-type converters
Interval 2 (Figure 3c): This is similar to Interval 3 in Continuous Current Mode 1 (CCM1), except that it ends with the zero-current turn-off of M1, M4
Interval 3 (Figure 3g): This is similar to Interval 2 in Continuous Current Mode 2 (CCM2), except that it starts with the resonant current shifting from Da, D6 to Db, M6
Summary
Phase-shift modulation is a widely-used control method in power converters, especially in the bridge-type converters. Referred as secondary phase-shift control, the inter-bridge phase-shift was applied for a unidirectional dual-bridge DC/DC converter [23,24,25,26,27]. The converter, including a semi-active rectifier with secondary phase-shift control, was proposed in [23] firstly and investigated further experimentally in [24], which is proven to be suitable for high output voltage applications. By using unidirectional switches on the semi-active rectifier, two secondary phase-shift-controlled converters were reported to be able to maintain soft switching for a wide range of input/output variation [25,26].
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