Analysis, design and simulation of a resonant DC link inverter for high power, high frequency brushless DC motor

The conventional voltage source inverter for motor drive encountered severe problems such as high EMI, wide range of harmonics, heavy acoustic noise and low efficiency. Resonant DC-link inverter technique becomes dominate in solving the above problems due to its simplicity in both power stage topology and control strategy. In this paper, operation principle of resonant DC-link inverter is analyzed. A design procedure of this type inverter for high power application (200 HP) is presented. PSPICE simulation on the designed resonant DC-link inverter has been conducted to verify its availability for high power application. The improvements in motor drive by using resonant DC-link inverter is shown by comparing the PSPICE simulation results of conventional hard switching inverter.