Dead-time compensation apparatus of PWM inverter and method...

Details Dead-time compensation apparatus of PWM inverter and method... Dead-time compensation apparatus of PWM inverter and method...

2009-12-28

2011-12-27

Benson, Walter (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S807000, C318S767000, C318S727000, C318S810000, C318S811000

Reexamination Certificate

active

08084986

ABSTRACT:
A dead-time compensation method is applied to a PWM inverter, which is provided to drive an induction motor using a constant V/f control. The method first calculates a root-mean-square current of the output instantaneous current of the inverter. Afterward, a lookup table of the root-mean-square current is used to obtain a dead-time compensation base voltage and a dead-time compensation per-unit voltage. Finally, the dead-time compensation base voltage is multiplied by the dead-time compensation per-unit voltage to produce a dead-time compensation voltage of the PWM inverter. Accordingly, the method reduces complexity of converting the current to the voltage to reach a faster real-time response. Furthermore, a more accurate dead-time compensation voltage is obtained without increasing hardware costs and the efficiency of operating the induction motor is improved at low speed and light load condition.

REFERENCES:
patent: 5253155 (1993-10-01), Yamamoto
patent: 6459230 (2002-10-01), Tao

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