A high-efficiency control system and method is presented. The system can feature a gate drive circuit, a floating charge pump and pump circuitry, and a bootstrap capacitor circuit having a floating ground. The floating charge pump features a ground electrically coupled to a load. The bootstrap circuit can feature a floating ground, with a floating voltage being carried across the bootstrap circuit and delivered to the gate drive circuit to produce an indefinite on-time for switching a high-side of a power supply to the load.

A system for driving an electric motor includes an inverter assembly including a main inverter circuit and an auxiliary circuit, the auxiliary circuit being a resonant circuit having a set of auxiliary switches and an inductor connected to each phase of the motor. The system includes a controller configured to control the inverter assembly according to one of a normal mode and a resonant mode. The controller operates the main inverter circuit to drive the electric motor when in the normal mode, and the controller controls the auxiliary circuit to control switching of the main inverter circuit when in the resonant mode. The controller is configured to control the inverter assembly according to the normal mode based on a load current being greater than or equal to a selected current threshold, and control the inverter assembly according to the resonant mode based on the load current being below the threshold.

A system for driving an electric motor includes an inverter assembly including a main inverter circuit and an auxiliary circuit, the auxiliary circuit being a resonant circuit having a set of auxiliary switches and an inductor connected to each phase of the motor. The system includes a controller configured to control the inverter assembly according to one of a normal mode and a resonant mode. The controller operates the main inverter circuit to drive the electric motor when in the normal mode, and the controller controls the auxiliary circuit to control switching of the main inverter circuit when in the resonant mode. The controller is configured to control the inverter assembly according to the normal mode based on a load current being greater than or equal to a selected current threshold, and control the inverter assembly according to the resonant mode based on the load current being below the threshold.