Analysis and design of a dual-bridge series resonant DC-to-DC converter for capacitor semi-active battery-ultracapacitor hybrid storage system
Electrical power systems in electrical vehicles require high energy density sources such as battery-ultracapacitor hybrid storage system. In order to draw energy from the source as well as recharging the ultra-capacitor during regenerative breaking, a dual-bridge series resonant DC-to-DC converter with modified gating scheme is proposed. The switches on the primary side of the transformer are controlled using the modified gating scheme, and the switches on the secondary side of the transformer are controlled using normal gating scheme having phase-shift with respect to the primary voltage. The use of modified gating scheme increases the number of switches operating in zero voltage switching, thus increasing the overall efficiency as well as reducing component stress. Moreover, the direction of the power flow is determined by the polarity of the phase shift between the primary and secondary sides of the converter. The proposed converter is analyzed using approximate ac equivalent circuit analysis for both ac impedance load and voltage source load. Based on the analysis, a design procedure and design curves are given. Finally, a 200 W converter with input voltage ranging from 64 V to 96 V and output voltage ranging from 88 V to 104 V is designed, and PSIM simulation and experimental results are shown to verify the theoretical values.
Analysis and design of a dual-bridge series resonant DC-to-DC converter for capacitor semi-active battery-ultracapacitor hybrid storage systemElectrical power systems in electrical vehicles require high energy density sources such as battery-ultracapacitor hybrid storage system. In order to draw energy from the source as well as recharging the ultra-capacitor during regenerative breaking, a dual-bridge series resonant DC-to-DC converter with modified gating scheme is proposed. The switches on the primary side of the transformer are controlled using the modified gating scheme, and the switches on the secondary side of the transformer are controlled using normal gating scheme having phase-shift with respect to the primary voltage. The use of modified gating scheme increases the number of switches operating in zero voltage switching, thus increasing the overall efficiency as well as reducing component stress. Moreover, the direction of the power flow is determined by the polarity of the phase shift between the primary and secondary sides of the converter. The proposed converter is analyzed using approximate ac equivalent circuit analysis for both ac impedance load and voltage source load. Based on the analysis, a design procedure and design curves are given. Finally, a 200 W converter with input voltage ranging from 64 V to 96 V and output voltage ranging from 88 V to 104 V is designed, and PSIM simulation and experimental results are shown to verify the theoretical values.
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