1 kW Interleaved Power Factor Corrector
Grid connected electrical equipment with a power consumption exceeding 75W must adhere to the European standard EN61000-3-2, which sets limits to the amount of distortion of the line current. This is usually achieved with a so-called Power Factor Corrector (PFC) front end. The purpose of this project was the development and realization of a bread board of an interleaved PFC for the universal input voltage range and with an output power of 1kW. Additionally, a paper design of a scaled-up version with 3kW power was carried out.
The splitting into two phases offers several advantages compared to a conventional 1-phase boost PFC. Here, the number of phases does not refer to the grid connection, which remains single phase. The internal realization of the circuit is such that the power is processed over two (or even more) mutually phase shifted power stages. With that the effective switching frequency can be doubled. This results in smaller components and is beneficial with respect to the thermal performance.
The selected topology offers further benefits concerning the input current. Due to the phase shifted drive of the main switches the inductor currents of each separate phase partially cancel each other. This reduced ripple current leads to lower EMI filtering effort, which frees up additional space. The layout as well as the size and shape of the breadboard design were optimized in close collaboration with the industrial partner and in accordance with the given specifications.
We continue to support the industrial partner during the industrialization phase of the final product.
Industry Partner: b2 electronic GmbH