Because it is bidirectional, it does not require another DC-DC converter or AC-DC converter to charge the battery. A battery backup system application is used in this paper for the control of this converter. Figure 2 shows the topology of this new isolated bidirectional DC-DC converter.
In this configuration, the system efficiency is 0%, i.e., all energy used to test the battery is lost. Using a bidirectional DC-DC converter would enable the recycling of the battery test charge energy by returning this energy to the system.
In a battery charge/discharge system, the bidirectional DC/DC converter can be a four-switch buck-boost converter when Vout is near the battery operation voltage, or it can be a boost converter when Vout is always higher than the battery voltage, or it can be a buck converter when Vout is always lower than the battery voltage.
It would be beneficial from a cost and size standpoint if the battery-charge and bus-interface functions could be accomplished in a single bidirectional DC-DC converter. Figure 1 is an existing isolated bidirectional DC-DC converter topology which has been widely used.
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