Active front end power converter with boost mode derating to protect filter inductor
A technology of power conversion and boost mode, which is applied in high-efficiency power electronic conversion, output power conversion device, AC power input conversion to AC power output, etc. It can solve the problem of not being able to quickly detect the overheating of the filter inductor core and the tripping of the driver , increasing system cost and complexity
Active Publication Date: 2014-09-17
ROCKWELL AUTOMATION TECH
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Problems solved by technology
However, in some applications it may not be desirable to trip the drive, so it is desirable to have techniques that allow the system to operate in boost mode without shutting down
Also, in order to sense an increase in temperature due to various reasons (such as to detect if the system blower fan is stopped while driving at full load), such a thermal switch may be placed at a distance from the inductor core, so the thermal switch may Inability to quickly detect overheating in the filter inductor core
Adding multiple thermal switches can solve this problem, but this approach further increases the cost and complexity of the system
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[0014] Referring now to the drawings, several embodiments or examples are hereinafter described in conjunction with the drawings, wherein like reference numerals are used to represent like elements throughout, and wherein various features are not necessarily drawn to scale. Methods and apparatus are disclosed for operating a motor drive or other active front end power conversion system with an active front end operating in boost mode to generate a voltage to the DC bus. Although illustrated and described in the context of AC motor drives, various concepts of the present disclosure find utility associated with other forms of power conversion systems having active front-end converters driving DC loads, where the present disclosure The content is not limited to the examples shown.
[0015] figure 1 An exemplary motor drive power conversion system 10 for receiving single-phase AC input power or multi-phase AC input power from an external power source 2 is shown. The example sho...
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Methods and apparatus are presented for controlling a power converter to protect input filter inductors from overheating, in which an active front end (AFE) rectifier is operated in a boost mode to provide a boosted DC voltage at a derated output current value selected according to the DC bus voltage boost amount corresponding to a maximum load condition for which the filter inductors will not overheat.
Description
technical field [0001] The present disclosure relates to the field of power conversion technology, and more particularly to methods and apparatus for boost mode derating. Background technique [0002] A power conversion system is used to provide alternating current (AC) output power to a load (eg, a motor drive driving an AC motor with an inverter stage). Active front-end (AFE) converters use switching rectifiers to convert input AC power to provide DC power to the bus, and inverter switches to convert the DC bus to output current for driving loads. Such an active front-end converter is usually coupled with an input filter (such as an LCL filter circuit connected to each power phase). Because the front-end rectifier is a switching circuit, the input filter operates to prevent unwanted harmonic content from being introduced into the grid or other input sources. Filter components, including filter inductors, are often designed based on power converter ratings, where oversizi...
Claims
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Login to View More IPC IPC(8): H02M5/458H02M1/32H02M1/00
CPCH02M1/32H02M7/219H02M2001/327H02M2001/0022H02M7/217H02M1/4216H02M1/4225Y02B70/10H02M1/0022H02M1/327H02P29/68H02P27/06
Inventor 约格什·帕特尔韦立祥
Owner ROCKWELL AUTOMATION TECH