CHARGING/DISCHARGING APPARATUS, BATTERY CHARGING AND DISCHARGING METHOD, AND CHARGING/DISCHARGING SYSTEM

Embodiments of the present application provide a charging and discharging device, which can improve the charging efficiency of a battery. The charging and discharging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter and a control unit, where one end of the second...

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Bibliographische Detailangaben
Hauptverfasser:	GAO, Jinfeng, HUANG, Xiaojian, QI, Chen, ZUO, Xiyang
Format:	Patent
Sprache:	eng ; hun
Schlagworte:	CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRICITY ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL GENERATION MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES PERFORMING OPERATIONS SYSTEMS FOR STORING ELECTRIC ENERGY TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	Embodiments of the present application provide a charging and discharging device, which can improve the charging efficiency of a battery. The charging and discharging device includes an AC/DC converter, a first DC/DC converter, a second DC/DC converter and a control unit, where one end of the second DC/DC converter is connected between the first DC/DC converter and the AC/DC converter and the other end of the second DC/DC converter is connected to an energy storage unit. The control unit is used to: receive a first charging request transmitted by BMS, the first charging request including a first charging voltage and a first charging current; set output power of the first DC/DC converter based on the first charging voltage and the first charging current; turn on the second DC/DC converter if an SOC of the energy storage unit is greater than a first threshold to charge the battery by the energy storage unit through the first DC/DC converter and the second DC/DC converter; and adjust output power of the second DC/DC converter if a bus voltage is less than a bus balance voltage of the charging and discharging device and a voltage difference between the bus voltage and the bus balance voltage exceeds a preset value in the process of charging the battery by the energy storage unit, so as to enable the voltage difference to be less than or equal to the preset value.