PWM pattern sequence to reduce losses in voltage source...

Details PWM pattern sequence to reduce losses in voltage source... PWM pattern sequence to reduce losses in voltage source...

2006-11-20

2008-10-07

Ip, Paul (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S801000, C318S806000, C318S808000

Reexamination Certificate

active

07432683

ABSTRACT:
A method for controlling an inverter uses sequences of predetermined states where each state uniquely corresponding to a set of control signals provided to the inverter that is coupled to a motor. The method includes repeatedly applying a first center null timing sequence of the states while monitoring a zero crossing condition and then changing the repeated application of the first center null timing sequence of the states into a repeated application of a second center null timing sequence of states when the monitoring detects a zero crossing condition. The repeated application of the first center null timing sequence sequentially provides the inverter with a first predetermined sequence of sets of control signals. The monitoring of a zero crossing condition monitors for a zero crossing condition in an electrical current flowing between the inverter and a terminal of the motor. The second center null timing sequence defines a second predetermined sequence of sets of control signals.

REFERENCES:
patent: 5483140 (1996-01-01), Hess et al.
patent: 5550450 (1996-08-01), Palko et al.
patent: 5821722 (1998-10-01), Forbes et al.
patent: 6356048 (2002-03-01), Zenoni et al.
patent: 6392418 (2002-05-01), Mir et al.

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