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Uninterruptible power supply and rectifying circuit of uninterruptible power supply

A rectifying circuit and current technology, applied in battery circuit devices, circuit devices, high-efficiency power electronic conversion, etc., can solve problems such as efficiency reduction and cost increase, and achieve improved power factor value, elimination of harmonic currents, and low volume and cost. Effect

Active Publication Date: 2012-09-19
VERTIV CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, doing so increases costs and reduces efficiency

Method used

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  • Uninterruptible power supply and rectifying circuit of uninterruptible power supply
  • Uninterruptible power supply and rectifying circuit of uninterruptible power supply
  • Uninterruptible power supply and rectifying circuit of uninterruptible power supply

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Embodiment Construction

[0018] Such as figure 2 As shown, in the logic diagram of UPS Embodiment 1 of the present invention, the UPS includes a rectification circuit, a storage battery and an inverter. When the power supply such as a three-phase AC input source is normal, the rectification circuit rectifies the AC voltage output by the power supply to DC Voltage, the DC voltage charges the battery, and at the same time, the inverter inverts the DC voltage output by the rectification circuit into AC power to supply power to the load (not shown) of the UPS. The following focuses on the rectification circuit of the UPS.

[0019] In the rectification circuit of the UPS, it includes: SCR rectifier, transformer, high-frequency rectifier and rectifier controller. The output terminals of the power supply are respectively connected to the input terminal of the SCR rectifier and the primary side of the transformer. At the input end of the rectifier, the SCR rectifier and the high-frequency rectifier are conn...

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Abstract

The invention relates to an uninterruptible power supply and a rectifying circuit of the uninterruptible power supply. The rectifying circuit comprises a semiconductor control rectifier (SCR), a transformer, a high-frequency rectifier and a rectifying controller, wherein the input end of the SCR is connected with a power supply, the primary edge of the transformer is connected with the power supply and the input end of the SCR, the input end of the high-frequency rectifier is connected with the secondary edge of the transformer, the output end of the high-frequency rectifier is connected in series with the output end of the SCR so that the direct current voltage is output through the serial connection between the SCR and the high-frequency rectifier, the rectifying controller calculates the harmonic current of the total input end according to the detected current flowing into the total input end of the SCR and the transformer, or calculates the harmonic current flowing into the SCR according to the detected current of the input end flowing into the SCR, and in addition, the high-frequency rectifier is controlled to generate the harmonic current opposite to the calculated harmonic current according to the calculated harmonic current. When the technical scheme of the invention is implemented, the harmonic current of the total input end can be reduced or even eliminated, and the power factor value is improved, so the current of the total input end approximates to the sine wave current.

Description

technical field [0001] The present invention relates to power electronic technology, more specifically, relates to an uninterruptible power supply (UPS) and its rectifying circuit. Background technique [0002] With the increasing demand for data protection, UPS (Uninterruptible Power Supply, uninterruptible power supply) has been used more and more widely. At present, high-power UPSs often use SCR (Silicon Controlled Rectifier, silicon-controlled rectifier) ​​rectifiers. The SCR rectifier adjusts the changing input voltage to the voltage required by the battery through the phase-shift clipping of the full-bridge SCR rectifier, and supplies the battery Provide the required charging voltage. The SCR rectifier has been widely used for a long time because of its simplicity, reliability and low cost. [0003] figure 1 It is a circuit diagram of a UPS in the prior art. The UPS includes a three-phase AC input source Source, a switch CB1, an inductor L1, a full-bridge SCR rectif...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M7/155H02M7/217H02M1/12H02M1/42H02J7/00H02J7/10
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 肖学礼
Owner VERTIV CORP
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