Control method and control device for square wave uninterruptible power supply

A control device and control method technology, applied in the direction of circuit devices, battery circuit devices, emergency power supply arrangements, etc., can solve the problems of increasing the cost of UPS, not fundamentally solving the problem of transformer bias saturation, and achieving the effect of preventing bias saturation

Active Publication Date: 2021-11-02
EATON MFG LP GLASGOW SUCCURSALE DE MOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above solution increases the cost of UPS, and does not fundamentally solve the bias magnetic saturation of the transformer

Method used

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  • Control method and control device for square wave uninterruptible power supply
  • Control method and control device for square wave uninterruptible power supply
  • Control method and control device for square wave uninterruptible power supply

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] In a nutshell, the control method of the present invention controls the inverter 15 (see figure 1 ) The frequency of the square wave output is gradually reduced to the power frequency from the initial frequency higher than the power frequency, so that the transformer 16 (see figure 1 ) of the volt-second product difference is reduced, thereby preventing the transformer 16 from magnetically saturating the bias.

[0038] For ease of understanding, the following will be based on figure 1 The control method of the present invention will be described in comparison with the existing control method when the alternating current is abnormal at phase angles of 0°, 45°, 90° and 135° (such as power failure). In the following, the abnormal...

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Abstract

The present invention provides a control method and control device for a square wave uninterruptible power supply. The control method includes the following steps: detecting the AC input voltage of the square wave uninterruptible power supply; when detecting that the AC input voltage is abnormal , disconnecting the AC input terminal and the AC output terminal of the square wave uninterruptible power supply; controlling the inverter in the square wave uninterruptible power supply to output a square wave, wherein the frequency of the square wave gradually decreases from the initial frequency Small to power frequency. The control method of the invention can prevent transformer bias magnetic saturation.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a control method and a control device for an uninterruptible power supply. Background technique [0002] Uninterruptible power supplies can continuously supply power to electrical equipment, and have been widely used in various fields. figure 1 It is a circuit diagram of a square wave uninterruptible power supply (UPS) in the prior art. Such as figure 1 As shown, the square wave UPS includes an AC input terminal 11, an AC output terminal 12, and a relay 13 connected between the AC input terminal 11 and the AC output terminal 12, and also includes a rechargeable battery 14, and an inverter connected to both ends of the rechargeable battery 14. An inverter 15 and a transformer 16 connected between the inverter 15 and the AC output terminal 12, wherein the inverter 15 is used to convert the direct current of the rechargeable battery 14 into a square wave. [0003] exist figure 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J9/06H02J7/00
Inventor 胡武华谢凯军胡志元
Owner EATON MFG LP GLASGOW SUCCURSALE DE MOR
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