Chopper circuit for dynamic braking in an electric power convers

Details Chopper circuit for dynamic braking in an electric power convers Chopper circuit for dynamic braking in an electric power convers

1991-10-30

1993-05-04

Stephan, Steven L.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318375, H02M 7525

Patent

active

052087417

ABSTRACT:
An improved electrical circuit configuration for a chopper circuit is disclosed which is particularly adapted for use with an inductive load such as a braking resistor of the type used in many rapid transit vehicles. Instead of connecting a di/dt reactor directly in series with the electronic switch of the chopper circuit, a di/dt reactor is connected in series with the freewheeling diode. Using this configuration, the di/dt reactor does not have to continuously handle the average current through the electronic switch during the entire chopping operation. Hence, a much smaller, lighter, and less expensive di/dt reactor can be utilized.

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