Power unit and multi-phase electric actuator using same

A technology of power unit and gate driver, which is applied in the direction of irreversible DC power input conversion to AC power output, AC power input conversion to AC power output, AC power input conversion to DC power output, etc., which can solve the limitation of cascading Issues such as the current rating of the power unit of the type multi-phase electric drive

Inactive Publication Date: 2015-06-24
ABB TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, dual IGBT modules in a 62mm case are very competitively priced, but are only available with ratings up to 400A
This further limits the current rating of the power unit of the cascaded multiphase electric drive

Method used

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  • Power unit and multi-phase electric actuator using same
  • Power unit and multi-phase electric actuator using same
  • Power unit and multi-phase electric actuator using same

Examples

Experimental program
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Embodiment Construction

[0014] figure 1 A power circuit diagram of a cascaded multiphase electric drive with three power cells per phase is shown. Such as figure 1 As shown, three-phase AC power is input to the primary winding 100 of the power transformer 10 of the cascaded multi-phase driver 1 . The primary winding 100 , which may be star-connected or mesh-connected, energizes the three-phase secondary windings 101 to 109 . The three-phase power associated with each of the secondary windings 101 to 109 is provided to power cells 110 to 118 respectively. In this embodiment, preferably, mesh-connected secondary windings 101 to 109 are provided to reduce the K-factor of the power transformer and improve harmonic control. Mesh-connected windings may include, for example, delta configurations or extended delta configurations. In some cases, such mesh windings can be manipulated so that some secondary windings advance by a preselected angle of electrical phase, others retard by a preselected angle of ...

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Abstract

It provides a power unit including: a multi-phase bridge rectifier, having inputs being electrically connectable to a source of multi-phase AC power; a smoothing filter, being connected to an output of said multi-phase bridge rectifier; and a multiple of H-bridge inverters; wherein: input terminals of said multiple of H-bridge inverters are electrically connected in parallel with said smoothing filter; and output terminals of said multiple of H-bridge inverters are electrically connected in parallel and are adapted for providing a single-phase output to an AC load. By having the power unit, it has one three-phase bridge rectifier thus it is helpful for eliminating the current sharing issues occurring among more than one three-phase bridge rectifiers. In addition, by having three H-bridge inverters electrically connected in parallel in the power unit, the current rate for the power unit is increased as compared with that with one H-bridge inverter. Preferably, a multiple of pre- charging resistors can respectively arranged between said output of said respective one of said multiple of legs of said multi-phase bridge rectifier and said respective one of said multiple of capacitor banks.

Description

technical field [0001] The present invention relates to the field of power units, and more particularly to power units used in cascaded multiphase electric drives. Background technique [0002] Cascaded multi-phase electric drives are used industrially to provide variable power to AC motors. These same drivers can be used in other applications not specifically involving electric motors but requiring variable output voltage or frequency. A typical drive has an AC input power supply and some type of conversion device, often using a solid-state device, to convert a fixed AC input voltage to a variable voltage and / or variable frequency output. One such type of drive is described in US Patent 5,625,545, which is hereby incorporated by reference. This patent describes a power supply used as a drive using several power cells arranged to produce a three-phase AC output. Such multiple power cells connected in series can be used to provide a higher voltage output than a single powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M7/49
CPCH02M5/4585H02M7/49H02M7/493H02M5/458
Inventor 安德雷斯·博埃赫利尤卡·帕洛迈基
Owner ABB TECH AG
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