Design Considerations for Resolver-to-digital Converters in Electric Vehicles
A resolver is an angular position sensor that is commonly used in harsh, rugged environments. A fully electric vehicle (EV) may use multiple resolvers for a variety of control systems that perform rotary motion and additional resolvers may be required to create system redundancy for safety. A resolver-to-digital converter (RDC) interface processes the analog output of the resolver sensor and communicates it in digital format to the engine control unit (ECU) in an EV. When designing an RDC interface, it is important to select the right RDC architecture to ensure that the circuit operates consistently under stringent conditions (such as vehicle acceleration). This article presents an overview for the architecture of a RDC interface circuit.