Electricity: motive power systems – Braking – Dynamic braking
Reexamination Certificate
2007-07-02
2010-06-22
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Braking
Dynamic braking
C318S508000, C318S375000, C318S376000, C318S368000, C323S364000, C327S101000, C324S677000, C340S870240
Reexamination Certificate
active
07741796
ABSTRACT:
A method for controlling brake resistors and a brake chopper, the number of brake resistors being two or more and the brake resistors being connected in series with switches to be controlled, the series connection being connected between a positive and a negative rail of a DC voltage intermediate circuit, the method comprising the step of determining a magnitude for a voltage of the DC intermediate circuit; and determining a first voltage limit and a second voltage limit. The method further comprises the steps of switching brake resistors to the intermediate circuit in a periodically alternating manner, each switch being switched during a switching period and the on-period of each switch in a switching period being responsive to the magnitude of the voltage in the DC voltage intermediate circuit when the voltage is above the first predetermined limit and below the second predetermined limit.
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Hirvonen Mikko
Pöyhönen Simo
Talja Markku
ABB Oy
Buchanan & Ingersoll & Rooney PC
Leykin Rita
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