System and method for precharging passive harmonic filters

Details System and method for precharging passive harmonic filters System and method for precharging passive harmonic filters

2007-05-30

2010-02-02

Masih, Karen (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S727000, C318S807000

Reexamination Certificate

active

07656117

ABSTRACT:
A system and method for precharging a harmonic filter connected to a power supply line to receive AC power and deliver the AC power to the motor drive unit includes a control circuit. The control circuit is configured to monitor an operational state of the motor drive unit or the power supply line, and generate a first control signal upon a predetermined change in the operational state and a second control signal delayed from the first control signal. The system also includes a charging circuit having a first switch configured to actuate in response to the first control signal to provide a reduced power to at least a portion of the harmonic filter and a second switch configured to actuate in response to the second control signal to provide a non-reduced power to the at least a portion of the harmonic filter.

REFERENCES:
patent: 2004/0051513 (2004-03-01), Rupp et al.
Allen-Bradley, Bulletin 100Q-Capacitor-Switching Contactors.

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