Abstract:
The paper proposes an integrated power converter
(IPC) with driving/charging capabilities for 4-phase switched
reluctance motor (SRM) drive based electric vehicle (EV)
application. With the proposed IPC, only two current sensors are
employed for measuring phase currents under all operating
conditions. The proposed IPC integrates three circuits. Firstly,
during the SRM driving mode, the proposed IPC is utilized as an
improved miller converter. Secondly, during battery charging
mode, the proposed IPC is utilized as an on-board battery charger
which is based on a bridgeless boost power factor correction
circuit (PFCC) that incorporates two DC-DC boost converters.
The on-board battery charger is realized by utilizing the existing
power electronic switches in the proposed IPC and all the phase
windings as charging inductors. Third, a front-end bidirectional
DC-DC converter for maintaining voltage and current balance
between IPC DC-bus and battery. During driving mode, the frontend converter boosts the battery voltage to the IPC DC bus
voltage. And during regeneration/braking, the stored magnetic
energy is used to charge the battery in constant-current (CC)
mode via the front-end converter. During battery charging via AC
grid, the bridgeless boost PFCC and the front-end converter
operating in buck mode charges the battery in CC/ constantvoltage (CV) modes without stepping down the AC grid voltage.
The claims of the proposed IPC are validated through simulation
and experimental verifications.
