Power conversion device of positive-negative bidirectional switching power supply, and control method

Abstract

The invention discloses a power conversion device of a positive and negative bidirectional switching power supply. The power conversion device comprises a power conversion unit, a control unit, a first chargeable and dischargeable energy storage unit and a second chargeable and dischargeable energy storage unit. The power conversion unit is respectively connected with the first chargeable and dischargeable energy storage unit and the second chargeable and dischargeable energy storage unit, and the control unit is respectively connected with and controls the power conversion unit, the first chargeable and dischargeable energy storage unit and the second chargeable and dischargeable energy storage unit. According to the device and the method, the power conversion function of the isolated positive and negative output bidirectional transmission switching power supply can be integrally realized, and the functions can be realized without mutual connection of a plurality of pieces of equipment; therefore, the size of the device is greatly reduced, the cost is effectively reduced, higher power conversion efficiency can be provided, and the energy-saving effect is achieved.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a power conversion device and a control method for an isolated positive and negative output bidirectional transmission switching power supply. Background technique [0002] Conventional switching power supplies can realize unidirectional conversion and transmission of power, and the output voltage is also positive or negative. In some special applications, two-way energy transmission is required, and the positive and negative output voltage can be variable. For example, in the field of bidirectional powering of lead-acid batteries, using existing conventional switching power supplies requires additional equipment to realize the above functions, which is costly and bulky. Contents of the invention [0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a power conversion device and a control method for an isolated posit...

AI Technical Summary

Problems solved by technology

In some special applications, it is required to transfer energy in two directions, and the output voltage can be changed positive and negative. For example, in the field of two-way powering of lead-acid batteries, using the existing conventional switching power supply requires additional equipment to realize the above functions, which is costly and bulky.

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