Boost converter input ripple current reduction circuit

Abstract

Name of the invention is boost inductor value reduction circuit that discloses a boost inductor value reduction circuit (12), which is integrated into a traditional boost power converter (10) to greatly reduce undesirable high frequency harmonics from being fed back to the input side of the boost power converter (10). The boost inductor value reduction circuit (12) is very small when compared with traditional filter techniques, is less costly than traditional filter techniques, and does not degrade the boost power converter control performance. It can also be used to reduce the size of the boost inductor (18) without compromising the converter performance for use in energy efficient sensitive applications such as photovoltaic inverters.

Description

technical field [0001] The present invention relates generally to boost power converters, and more particularly to systems and methods for reducing the size of an input filter of a boost power converter. Background technique [0002] Boost power converters are used in many different applications to provide high power factor to AC power lines, and / or to provide a regulated DC bus for specific power applications. An important problem inherent in such boost power converters involves high frequency harmonics associated with the boost power converter switching frequency fed back to the boost power converter input (ie, the AC power line). Specific regulatory mechanisms typically require attenuation of these high frequency harmonics by a factor of 100 or more to meet the desired regulatory level. High frequencies can also stress capacitors through internal heating and dielectric material failure. [0003] Traditionally, known boost power converters employ bulk filtering technique...

AI Technical Summary

Problems solved by technology

The techniques, systems and devices are generally very large and expensive due to the requirement that the filtering be very effective at low frequencies (i.e. on the order of 100kHz)

These filtering techniques often become so large that the interaction between the filter and the boost power converter can cause undesirable stability issues

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