The Bi-Directional EV On-Board Charger is the way forward for environment friendly EV charging, being compact but power-packed and providing advantages past mere charging.

The evolution of electrical automobiles (EVs) has ushered in a requirement for extra environment friendly and compact charging options. The Bi-Directional EV On-Board Charger (OBC) represents a leap, marrying energy and effectivity in a compact design. This charger facilitates the fast charging of EVs and presents a bi-directional energy circulation, permitting the car’s battery to return vitality to the grid or assist house vitality wants. Such capabilities handle the rising demand for versatile charging options that combine with the evolving good grid and residential vitality techniques, making certain that EVs are shoppers and potential vitality contributors. Wolfspeed has launched the reference design for a 6.6 kW high-power density bi-directional EV on-board charger to simplify the design course of. CRD-06600FF065N-Okay incorporates a SiC MOSFET, the C3M0060065K.

The reference design board is designed for remoted Bi-Directional EV charging techniques. This board presents an remoted adjustable DC output by utilising a single-phase AC enter, making it perfect for battery charging. Nonetheless, for efficient operation, this output needs to be linked to a resistive or digital load, with the Fixed Present (CC) mode being really helpful. That is very important as a result of the board doesn’t embody a predefined battery charging algorithm. Furthermore, in its Direct Present to Alternating Present (DC/AC) mode, signifying its discharge mode, the board is adept at offering energy to a resistive load, however this necessitates the output being related to a DC voltage supply.

The OBC can operate on a common, single-phase enter, delivering an output voltage between 250 VDC and 450 VDC. Relying on necessities, it might probably work in constant-current, constant-voltage, or fixed energy mode, and these parameters may be adjusted by way of a Controller Space Community interface (CAN) interface. Its preliminary AC/DC Energy Issue Correction stage, adopting a steady conductivity mode totem-pole bi-directional design, runs at 67KHz, resulting in a DC hyperlink voltage. This voltage is then processed by a Bi-Directional Remoted DC/DC Capacitor-Inductor-Inductor-Capacitor (CLLC) resonant converter, working between 148-300KHz. Because the charging battery voltage oscillates between 250Vdc and 450Vdc, the DC hyperlink voltage adjusts from 385Vdc to 425Vdc, maximising the OBC’s effectivity. This modern design permits a peak effectivity of 96.5% throughout charging and discharging. Each enter and output segments of the DC/DC stage deploy a full bridge swap system segregated by a high-frequency transformer. 

A uniquely crafted heatsink manages the warmth dissipation of all energy MOSFETs and energy magnetics, boosting the design’s energy density to a powerful 54 W/in3. Whereas this unit is crafted for EVs, it lacks a built-in battery charging algorithm. When in DC/AC mode (discharging), it’s important to make use of a resistive load for testing. In distinction, digital and resistive hundreds may be employed in its AC/DC mode (charging), with a most output present restriction of 18A in charging mode.

Wolfspeed has examined this reference design. It comes with a Invoice of Supplies (BOM), schematic, and many others. Yow will discover further knowledge in regards to the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.