A DC-DC bidirectional conversion circuit and power supply

Abstract

The embodiment of the invention provides a direct current-direct current bidirectional conversion circuit and a power supply, and aims to solve the problems of enlargement of the size of a UPS (Uninterrupted Power Supply), increase of the cost and reduction of the power density which are caused by the separate design of a charging circuit and a discharging circuit of a battery hung in the UPS at present. The circuit comprises a transformer, a first switch unit, a second switch unit, a first capacitor and a second capacitor, wherein one of a primary winding and a secondary winding of the transformer, the first capacitor and the first switch unit are connected in series to form a first branch circuit; the first branch circuit is connected between the anode of a battery pack and the positive direct current bus of the UPS; the second capacitor is connected in parallel with the first branch circuit; the other one of the primary winding and the secondary winding of the transformer, and the second switch unit are connected in series to form a second branch circuit; the second branch circuit is connected between the anode of the battery pack and the cathode of the battery pack; the cathode of the battery pack is connected with the negative direct current bus of the UPS.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC-DC bidirectional conversion circuit and a power supply. Background technique [0002] At present, in order to ensure uninterrupted power supply of UPS (Uninterrupted Power Supply), the battery is connected to the power factor correction (PFC, Power Factor Correction) circuit in the UPS through a specific circuit, or connected to the DC bus of the PFC circuit , There is a process of charging and discharging the battery during the use of the UPS. When the battery needs to be charged, the DC bus charges the battery through the charger circuit, and the charger circuit is a Buck circuit; when there is no mains power or the mains voltage is low, the battery boosts the DC bus through the discharger circuit, and the discharger circuit is a Boost circuit. circuit. [0003] For low-power UPS, due to the low voltage of the battery and the high voltage of the DC bus, the vol...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a DC-DC bidirectional conversion circuit and a power supply to solve the problem that the current charger circuit and discharger circuit configured for the battery connected to the UPS are designed separately, which will lead to an increase in the size of the UPS. Larger size, higher cost, lower power density

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