PUBLICATIONS

This paper proposes the new clamping angle control (CAC) pulse width modulation (PWM) method to restore its maximum linear

modulation range of voltage source inverters (VSIs) reduced by the duty ratio limitation in hardware implementation, which makes the

VSIs to operate nonlinearly in the high modulation range. The deadtime and the bootstrap gate driver circuit mainly cause this duty

ratio limitation in practice. In particular, the bootstrap gate driver circuit is used in many industrial applications by avoiding the

additional power supply to apply the gate-source voltage of power switches, and therefore making the VSIs to be small size with the

low cost. First, the proposed CACPWM method is theoretically analyzed. Then, it is applied in the high modulation range to overcome

the limitation of the duty ratio due to the use of the bootstrap gate driver circuit. Thereafter, its practical effectiveness is verified by

both simulation and experimental tests. Also, the resulting harmonic distortions are compared with those by the conventional PWM

methods.