At PCIM in Nuremberg this week, Texas Instruments announced an automotive-qualified LLC controller for light electric vehicle charging, and demonstrated it in a three-stage ac-dc battery charger for electric two-wheelers. (LLC is an inductor-inductor-capacitor topology, see diagram) “But despite the benefits that the LLC topology can offer, including minimal standby power and low audible noise, electric vehicle manufacturers have been ...
Premo has releases an integrated wound component package for automotive on-board LLC chargers rated up to 11kW. BCBM-11KW-004 combines 14:15 transformers and resonance inductors for three 3.6kW phases, taking in 400V and delivering 240-460V (<14.7Arms) when switched between 98 and 150kHz. The enclosure is 87(+lugs) x 38(+pins) x 158mm, and the parts inside are encapsulated. “The usage of specific thermal conductive ...
Fairchild has launched an isolated dc-dc controller chip which adds current-mode control to LLC resonant power supplies. Called FAN7688, it has ‘charge current control’, instead of the voltage mode control traditionally used for LLC. “This “allows for tighter and faster output regulation against load transients and also simplifies the control loop,” said Farichild. The technique involves combining a triangular waveform from the ...
XP Power has revealed design features within its latest ac-dc power supply, dubbed ELP225, which can deliver 150W convection-cooled from a 51 x 102mm industrial ‘1U’ footprint package. Only 32.3mm high, this is believed to be a power density record for the 1U open frame format. 225W is available with 10CFM forced airflow (see later). Higher efficiency has allowed so ...
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