Auxiliary power supply with bidirectional power supply

Abstract

The present invention discloses an auxiliary power supply with a bidirectional power supply, comprising a bidirectional isolating converter, a first non-isolating converter, a second non-isolating converter, a first combining selector and a second combining selector, wherein the first combining selector is respectively connected with a primary side pressure-wire, the bidirectional isolating converter and the first non-isolating converter; and the second combining selector is respectively connected with a secondary side pressure-wire, the bidirectional isolating converter and the second non-isolating converter. According to the embodiment of the present invention, when power supply of the primary side and the secondary side is abnormal, the auxiliary power supply still can supply power fora primary side auxiliary power supply and a secondary side auxiliary power supply normally with the only one bidirectional isolating converter, thereby reducing cost and size for the isolating, and raising efficiency of auxiliary power converting during normal power supply of the primary side and the secondary side.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power supplies, and in particular to a bidirectional power supply auxiliary power supply. Background technique [0002] In the switching power supply, the auxiliary power supply is the basis for ensuring the stable operation of the switching power supply. With the continuous expansion of the functions of the communication primary power supply module, new requirements are put forward for the auxiliary power supply. The battery at the output is powered. [0003] figure 1 It is a schematic diagram of the structure of the existing traditional bidirectional power supply auxiliary power supply, such as figure 1 As shown, the auxiliary power supply is implemented by two cascaded isolation converters. When the AC power is on, the 400V DC bus voltage is isolated and transformed by the first-stage isolation converter 11 to obtain a lower DC voltage. The DC voltage and the output DC voltage...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a bidirectional power supply auxiliary power supply, which is used to solve the defects of high isolation cost, large volume and auxiliary power supply efficiency in the prior art, reduce the isolation cost and volume of the bidirectional power supply auxiliary power supply, and improve the auxiliary power supply efficiency of the bidirectional power supply auxiliary power supply

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