Chopper circuit for dynamic braking in an electric power...

H - Electricity – 02 – P

Patent

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H02P 3/12 (2006.01)

Patent

CA 2082263

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 (38) 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 (84) is connected in series with the freewheeling diode (46). Using this configuration, the di/dt reactor (84) does not have to continuously handle the average current through the electronic switch (42) during the entire chopping operation. Hence, a much smaller, lighter, and less expensive di/dt reactor (84) can be utilized.

Configuration améliorée de circuit électrique destinée à un circuit découpeur et apte notamment à s'utiliser avec une charge inductive telle qu'une résistance de freinage (38) du type qui est utilisé dans de nombreuses rames de métro ou analogue. Au lieu de raccorder un réacteur di/dt directement en série au commutateur électronique du circuit découpeur, on raccorde un réacteur di/dt (84) en série à la diode de roue libre (46). Grâce à cette configuration, ledit réacteur di/dt (84) n'est pas contraint d'admettre en continu le courant moyen traversant le commutateur électronique (42) pendant l'ensemble de l'opération de découpage. De ce fait, on peut utiliser un réacteur di/dt (84) beaucoup plus petit, plus léger et moins coûteux.

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