Fig. 1. The evolution process of the proposed topology. (a)Bidirectional H-bridge DC-DC converter without a commonground [29]. (b) Evolution process of the proposed topology. (c)Proposed bidirectional DC-DC converter with a commongrounded asymmetric H-bridge.
Fig. 2. PWM modulation strategy in the step-down mode (S2S4=00).
Fig. 3. PWM modulation strategy in step-up mode (S1S3=00).
Fig. 4. Comparison of voltage-conversion ranges for the proposedconverter and the Buck/Boost converter. (a) In the step-downmode. (b) In the step-up mode.
Fig. 5. Synchronous rectification operation principle of theproposed bidirectional converter. (a) Current-flow path in thestep-down mode. (b) Current-flow path in the step-up mode.
Fig. 6. Control strategy of bidirectional power flows.
Fig. 7. Experimental prototype of the asymmetric H-bridgebidirectional DC-DC converter.
Fig. 8. Voltage stress and gate signals of the slave active powerswitches in SR operation. (a) Gate signal and voltage stress of Q2in the step-down mode. (b) Gate signal and voltage stress of Q3in the step-up mode.
Fig. 9. Voltages on the high voltage side (constant 200V) and thecontinuous variable low voltage side (between 24V and 48V). (a)In the step-down mode. (b) In the step-up mode.
Fig. 10. Output PWM voltages, inductor current iL and thecorresponding gate signal-voltage stress in the step-down mode.(a) Uag and Uab. (b) Ubg and the inductor current iL. (c) S1 andUQ1.
Fig. 11. Output PWM voltages, inductor current iL and thecorresponding gate signal-voltage stress in the step-up mode. (a)Uag and Uab. (b) Ubg and the inductor current iL. (c) S4 and UQ4.
Fig. 12. Experimental results of bidirectional operation betweenthe step-down and the step-up modes. (a) Processes of step-up tostep-down and step-down to step-up. (b) Transient process of thestep-down to step-up mode (IL=-4A to 4A). (c) Transientprocess of the step-up to step-down mode (IL=4A to -4A).
Fig. 13. Conversion efficiency of the proposed bidirectionalconverter at different voltages of low voltage side and loadpowers (Ul=24~48V, Uh=200V).
Fig. 14. Calculated power loss distributions for the experimentwhen Ul=48V, Uh=200V, P=300W. (a) In the step-down mode.(b) In the step-up mode.
TABLE I COMPONENT STATES WHEN THE POWER FLOW IS FROM UH TO UL (STEP-DOWN)
TABLE II COMPONENT STATES WHEN THE POWER FLOW IS FROM UL TO UH (STEP-UP)
TABLE III COMPARISONS OF THE PROPOSED AND OTHER BIDIRECTIONAL SOLUTIONS
TABLE IV EXPERIMENTAL PARAMETERS
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