Push-pull converter and method for power supply device and uninterrupted power supply system

Abstract

This invention provides a zero-voltage switch push-pull converter and a method for continuous supplying power system of a power source supplier, in which, the converter includes a transformer containing a primary winding with a central tap and a secondary winding, an electric energy storage supply device, one end of which is connected with the central tap of the primary winding, the other end to the earth, a first master switch element, the first end of which is linked to the first end of the primary winding, and the second to the earth, a second master switch element, its first end to the earth, the second to a second end of the primary winding and a commutating circuit connected to the second winding to convert AC to DC provided by it to let the primary circuit element switch at zero voltage.

Description

technical field

[0001] The invention relates to a zero-voltage switching push-pull (Push-Pull) converter and a method for a power supply and an uninterruptible power supply system, especially a push-pull (Push-Pull) converter whose primary side The circuit switches at zero voltage. Background technique

[0002] For an online uninterruptible power supply system (UPS), there are generally three working modes: online mode, backup mode and bypass mode. In the backup power supply mode, the battery supplies power to the load through a DC-DC converter and an inverter. Usually, the DC-DC converter converts and boosts the battery voltage to the voltage value required by the DC bus; and the inverter converts the DC voltage of the DC bus into an AC voltage output.

[0003] Limited by the voltage value of a single battery, the battery packs in the UPS system generally adopt a series power supply mode. In order to improve the reliability of the system, the number of batteries connecte...

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