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UPS and method for improving its transient response time

A power supply and battery technology, applied in current collectors, electric vehicles, electrical components, etc., can solve problems such as the degradation of transient response performance, the current cannot accurately reflect the actual current, etc., to achieve the effect of improving system reliability

Inactive Publication Date: 2002-08-14
LIANYUNGANG DAFA ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
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Problems solved by technology

[0004] However, since the positive and negative boost converter inductor current sampling signals I1 and I2 sample the current sum of the two parallel inductors (L1, L2 or L3, L4), due to the mutual influence between them and the influence of other branches The sampled current cannot accurately reflect the actual current flowing through each inductor, which will lead to a decrease in transient response performance

Method used

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  • UPS and method for improving its transient response time
  • UPS and method for improving its transient response time
  • UPS and method for improving its transient response time

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Embodiment Construction

[0020] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] figure 2 is a typical embodiment of the present invention, and figure 1 Similarly, the basic principle is to detect the inductor current signal and feed forward the voltage waveform after the rectifier bridge (that is, the positive and negative voltage output sampling signals (REC1, REC2) after voltage rectification) to achieve high-quality input current waveforms and reduce input harmonics. wave current. Its circuit structure is similar to the traditional average value control technology, which can be called the average value current injection control scheme. The scheme can be a single-phase average value current injection control, or a three-phase average value current injection control in which the rectifier circuit and the AC input end are three-phase four-wire system, figure 2 The example in is only three-phas...

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Abstract

The invention relates to Uniterrupted Power Source (UPS) and a method for improving transient response time. The characteristics are as follows: inductance current sampling signals of transformer with positive and negative increase of voltage in the adjusting branch of positive and negative power factor are respectively taken from two parallel circuits; one sampled current is from one of inductors (L1, L2) in the circuit of transformer with positive increase of voltage and the other sampled current is from one of inductors (L3, L4) in the circuit of transformer with negative increase of voltage. The ivnention does not sample total current of parallel inductors in order to reduce magnification of current loop so as to increase bandwidth of current loop and transient response time of system.

Description

Technical field: [0001] The invention relates to an uninterruptible power supply (UPS) and a method for improving its transient response time, especially an uninterruptible power supply with a power factor correction circuit (PFC) and a method for improving the transient response time thereof. Background technique: [0002] In recent years, some control schemes have been proposed for three-phase four-wire high frequency chain UPS, they are peak current control, average current control and so on. After adopting these improved control strategies, the 5th and 7th harmonic content can be greatly reduced. Although these control strategies can effectively improve the input power factor, they have their own shortcomings. Among them, the peak current control scheme has different three-phase input current waveforms, and the total harmonic current is relatively large; the average current control is widely used, and the total harmonic current is small compared with the average value co...

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Application Information

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IPC IPC(8): H02J7/00H02M1/12H02M7/00
Inventor 杨戈戈
Owner LIANYUNGANG DAFA ENVIRONMENTAL PROTECTION TECH CO LTD
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