A single, smart charger inside an electric vehicle replaces two separate units. It connects to the power grid to fill the main driving battery and, when the car is on the move, automatically redirects power to run lights, stereo, and other 12/24-volt devices without needing an extra converter box. By reusing the same electronics parts in different modes, the charger stays compact, efficient, and reliable. Computer simulations show it can charge or discharge the main battery to the grid, then switch over to feed the low-voltage system all with fewer components and long-lasting film capacitors instead of large, failure-prone ones.
Figure (1) Circuit Topology of the multifunctional onboard charger; (2) Prototype of the GaN-based 7.2 kW multifunctional onboard charger
Electric-vehicle (EV) owners today need two separate chargers on board: one big unit to fill the main drive-battery from the grid and another small unit to power the car’s lights, stereo, and other 12-/24-volt electronics. This doubles cost, wastes space, and adds bulky parts that fail more often.
- Combines two chargers into one: A single smart circuit charges the main battery and, when the car is driving, automatically steps down power for the low-voltage system no extra DC-DC box needed.
- Reuses the same parts for every mode: The same switches, coils, and transformer handle grid-to-car, car-to-grid, and drive-mode tasks, shrinking size and boosting power density.
- Cuts voltage ripple without bulky capacitors: An in-built ripple-smooth circuit lets the designer replace large, failure-prone electrolytic capacitors with long-life film parts, raising reliability.
So far, a detailed circuit design has been created and tested in computer simulations (PSIM). A lab-level prototype is developed and tested. These tests confirm that the charger can handle real-world driving and charging scenarios: it shows clean power from the grid, efficient charging of the main battery, and smooth 12/24-volt output in drive mode.
A complete circuit blueprint has been created and thoroughly tested in advanced computer simulations. These tests show the charger meets performance goals for efficiency, grid friendliness, and battery health.
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By trimming cost, weight, and failure points inside every EV, this charger can make electric cars more affordable and reliable. Its bidirectional power feature also lets parked cars give energy back to the grid, helping balance renewable sources and reducing overall carbon emissions.
- Electric passenger cars
- Plug-in hybrid vehicles
- Electric buses
- Light-duty delivery fleets
Geography of IP
Type of IP
202221050579
553268