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Multi-phase active rectifier

A rectifier and controller technology, used in the conversion of AC power input to DC power output, output power conversion devices, climate sustainability, etc.

Inactive Publication Date: 2012-11-28
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various control schemes are available for these purposes, however, many of the control schemes employ complex transformations that require digital signal processors to perform

Method used

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Embodiment Construction

[0007] The present invention provides a multiphase active rectifier system employing an analog controller for providing DC output voltage regulation and suppression of harmonics on line current (ie, power factor correction).

[0008] figure 1 is a circuit diagram of a power conversion system 10 according to an embodiment of the present invention. Power conversion system 10 includes generator 12 , active rectifier 14 , load 16 , and controller 18 . Generator 12 generates polyphase alternating current (AC) voltage Va , Vb , Vc to be provided to the active rectifier 14 via inductors L1, L2 and L3, respectively, which smooth the line current Ia , Ib , IC role. The active rectifier 14 converts the multiphase AC input voltage Va , Vb , Vc Converted to DC output voltage Vdc In order to provide to the load 16. Capacitor C1 is connected across the DC output in parallel with load 16 to provide the DC output voltage for Vdc smoothness.

[0009] The active rectifi...

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PUM

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Abstract

A multi-phase active rectifier includes a plurality of active switching devices selectively controlled to convert a plurality of alternating current (AC) input voltages to a direct current (DC) output voltage. Control of the active switching devices is provided by a controller that includes an outer control loop for regulating the DC output voltage to a desired value, and an inner current loop for shaping the AC line current. The outer control loop compares the DC output to a threshold value to generate an error value, and multiples the error value with the plurality of monitored AC input voltages to generate modified AC input voltages. An inner control loop compares the modified AC input voltages with monitored AC line current values to generate a plurality of difference signals used to selectively control the plurality of active switching devices.

Description

technical field [0001] The present invention relates to power conversion, and in particular to multiphase active rectifiers. Background technique [0002] As far as rectifiers are concerned, the simplest and least expensive type of rectifier uses a full or half bridge of diodes to convert a single-phase or multi-phase alternating current (AC) input to a direct current (DC) output. However, passive rectifiers of this type cause distortion and phase shifting of the line current relative to the line voltage which reduces the efficiency of the rectifier. [0003] Active rectifiers replace passive diode components with active switching devices (e.g. metal-oxide-semiconductor field-effect transistors (MOSFETs), insulated-gate bipolar transistors (IGBTs), etc.) On and off to control rectification of AC input to DC output. The benefits of active rectifiers include the ability to regulate the DC output voltage and modify the shape of the line current drawn by the active rectifier t...

Claims

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Application Information

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IPC IPC(8): H02M7/219
CPCH02M7/219H02M7/2173Y02B70/10
Inventor J.H.克莱蒙斯N.弗拉斯尼克
Owner HAMILTON SUNDSTRAND CORP