Reference Design For six.6kW Unidirectional On-Board Charger



The horizon of EV charging is illuminated by a 6.6kW OBC reference design, leveraging GaN’s potential for swift and environment friendly power switch.


The transition to electrical automobiles (EVs) marks a revolutionary shift within the automotive sector, and with this transformation comes the crucial to handle the challenges and intricacies of EV charging infrastructure. A pivotal element on this ecosystem is the on-board charger (OBC), answerable for changing alternating present (AC) from the grid to direct present (DC) to cost the automobile’s battery. Particularly, a 6.6kW OBC has emerged as a big participant on this area. This energy ranking balances charging pace and infrastructure demand, offering shoppers a comparatively fast charging resolution with out overburdening residential and public electrical techniques. VisIC Applied sciences has launched a 6.6kW unidirectional OBC reference design, VRD-UNIOBCV1M1, to simplify the design course of.

The reference design highlights the power of 22mΩ Energy FET GaN transistors to enhance OBC effectivity and amplify energy density by way of elevated switching frequencies. The OBC incorporates six Gallium Nitride (GaN) units with two within the Twin Enhance Bridgeless Energy Issue Correction (PFC) and 4 within the Full Bridge LLC (Inductor-Inductor-Capacitor) with diode rectification. The advantages of GaN result in the downsizing of PFC inductors and the LLC transformer whereas making certain low energy losses and a lowered variety of units. Furthermore, it demonstrates an environment friendly warmth dissipation method utilizing an remoted prime cooling resolution.

The OBC boasts a number of options, together with a excessive energy density of 3kW/L and an effectivity price of 96%. The charger can accommodate an enter of 90V-264V/47-63Hz in a single section and offers an output starting from 240V to 420V. It could possibly ship energy as much as 6.6kW with a 20A present at its most capability, utilizing liquid cooling by way of a chilly plate. For security and performance, the charger contains protections equivalent to Enter Below Voltage Safety (UVP), Over Voltage Safety (OVP), and Over Present Safety (OCP). Remarkably, it has a Energy Issue (PF) at a full load of 0.99 and provides Load Fixed Present (CC), Fixed Voltage (CV), and Fixed Resistance (CR) modes. Moreover, the CANAnalyst has a Graphical Consumer Interface (GUI) for streamlined management and monitoring.

A few of the key specs of VisIC 22mOhm GaN are:

Dimensions, mm: 230D x 170W x 60H
Weight: 4.5kg
Energy: 6.6kW
Energy density: 2.8kW/L
HV transistors depend: 6

VisIC Applied sciences has examined this reference design. It comes with a Invoice of Supplies (BOM), schematics, and so forth. You could find further information concerning the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.


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