Abstract: A bidirectional portable energy storage power supply without an adapter includes an energy storage unit, a first full bridge circuit, a resonant network, a second full bridge circuit, a third full bridge circuit and a charging and discharging interface circuit connected in turn. Each of the first full bridge circuit, the second full bridge circuit and the third full bridge circuit can be used as an inverter circuit or a rectification circuit, the charging and discharging interface circuit switchably connected with a mains network and a workload, the resonant network combined with the first full bridge circuit or the second full bridge circuit to implement soft-switching. The present disclosure can implement to bidirectionally charge and discharge the portable energy storage power supply by omitting an external adapter thereof, to improve a charging and discharging conversion efficiency, shorten a charging time and reduce a volume of power supply.

Abstract: A bidirectional portable energy storage power supply without an adapter includes an, energy storage unit, a first full bridge circuit a resonant network, a second full bridge circuit, a third full bridge circuit and a charging and discharging interface circuit connected in turn. Each of the first full bridge circuit, the second full bridge circuit and the third full bridge circuit can be used as an inverter circuit, or a rectification circuit, the charging and discharging interface circuit switchably connected with a mains network and a workload, the resonant network combined with the first full bridge circuit or the second full bridge circuit to implement soft-switching. The present disclosure can implement to bidirectionally charge and discharge the portable energy storage power supply by omitting an external adapter thereof, to improve a charging and discharging conversion efficiency, shorten a charging time and reduce a volume of the power supply.

Abstract: A method for product comparison is described, including: receiving a product comparison request sent by a client terminal, the product comparison request carrying identification information of at least two products to be compared; pulling attribute information of each of the at least two products according to the identification information of each of the at least two products; calculating an integrated score of each of the at least two products according to the attribute information of each of the at least two products; and generating comparison information of the at least two products, and returning the comparison information to the client terminal. Further, a server, a client terminal, and an electronic commerce system are also described. A comparison conclusion can be visually presented in comparison information of products, improving the actual effect and usage rate of the product comparison and enhancing the intelligence of the electronic commerce system.