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Control method and control device of square wave uninterruptible power source

A control method and control device technology, applied in the direction of circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of transformer bias saturation, increase the cost of square wave UPS, etc., and achieve the goal of preventing bias saturation Effect

Active Publication Date: 2018-02-06
EATON MFG LP GLASGOW SUCCURSALE DE MOR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above solutions increase the cost of the square wave UPS, and do not fundamentally solve the bias magnetic saturation of the transformer

Method used

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  • Control method and control device of square wave uninterruptible power source
  • Control method and control device of square wave uninterruptible power source
  • Control method and control device of square wave uninterruptible power source

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Embodiment Construction

[0034] 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.

[0035] 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 voltage detection time is 2 milliseconds, the switching time of the relay 13 is 6 milliseconds, and the peak voltage V of the square wave output by the inverter 15 in battery mode PK The control method of this embodiment will be described in detail by taking 343 volts, a frequency of 50 Hz, and a pulse width of 4.5 milliseconds as an example.

[0036] Figure 2a It is a timing chart of the output voltage according to t...

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PUM

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Abstract

The invention provides a control method and control device of a square wave uninterruptible power source. The control method includes the following steps that: the alternating current input voltage ofthe square wave uninterruptible power source is detected; when it is detected that an abnormality occurs in the alternating current input voltage, the alternating current input end of the square waveuninterruptible power source is disconnected from the alternating current output end of the square wave uninterruptible power source; and an inverter in the square wave uninterruptible power source is controlled to alternately output positive and negative pulses, the frequency of the positive and negative pulses is gradually reduced to 2 times of a power frequency from an initial frequency. Withthe control method of the invention adopted, the magnetic biasing saturation of a transformer can be prevented.

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, an inverter 15 and a transformer connected in sequence. 16, wherein the inverter 15 is used to convert the DC power at both ends of the rechargeable battery 14 into a square wave voltage, and the transformer 16 is used to adjust the voltage of the square wave voltage output by the inverter 15 and output it to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
CPCH02J9/061Y02B70/30Y04S20/20
Inventor 胡武华谢凯军
Owner EATON MFG LP GLASGOW SUCCURSALE DE MOR
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