Braking chopper

Details Braking chopper Braking chopper

2006-11-28

2006-11-28

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Braking

Dynamic braking

C318S379000, C318S375000

Reexamination Certificate

active

07141947

ABSTRACT:
A braking chopper for dissipating braking power away from the direct-current rails of an AC drive system, said braking chopper being an inverter unit (INU) physically similar to those also used as motor supply devices, consisting of upper- and lower-branch controllable semiconductor switches (V1–V6), wherein the inverter is connected by its output connectors to the direct-current rails (DC) via a resistor unit, which resistor unit contains two resistors (R1, R2), of which the first is connected to the positive direct-current rail (DC+) and the second to the negative direct-current rail (DC−), wherein both lower-branch and upper-branch semiconductor switches are turned on during braking, and wherein one brake resistor is controlled by the lower-branch switch of only one phase and the second brake resistor by the upper-branch switch of another phase.

REFERENCES:
patent: 6175204 (2001-01-01), Calamatas
patent: 2003/0223738 (2003-12-01), Hughes et al.
patent: 2004/0145337 (2004-07-01), Morishita
patent: 2004/0227479 (2004-11-01), Youm
patent: 75070 (1987-12-01), None
patent: 60-66690 (1985-04-01), None
patent: 6-90578 (1994-03-01), None
patent: 748751 (1980-07-01), None

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