Semiconductor d.c. chopper controllers

Details Semiconductor d.c. chopper controllers Semiconductor d.c. chopper controllers

1978-02-02

1980-06-03

Shoop, William M.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

318811, 307252M, H02M 7515

Patent

active

042065020

ABSTRACT:
In a d.c. chopper controller having an "ON" controlled rectifier for interrupting a load current and a discharge circuit connected in parallel with the "ON" controlled rectifier, said circuit incorporating a commutating capacitor, an "OFF" controlled rectifier which is arranged to apply voltage formed on the capacitor across the "ON" controlled rectifier in a direction to reverse the current flow therethrough and a charging circuit for the commutating capacitor including a third controlled rectifier connected to a reference source, the improvement comprising operating the controller by means of a control circuit such that a charge for the commutating capacitor is provided at a selectable instant during the period that the "ON" controlled rectifier is conducting. This improvement enables secure commutation irrespective of the interruption rate of the "ON" controlled rectifier or the magnitude of the load current. The reference source can be independent of the load current source thereby enabling a higher voltage to be applied to the commutating capacitor and/or a smaller commutating capacitor or slower "ON" controlled rectifier to be used. In a modified arrangement an additional discharge circuit for the commutating capacitor is provided so that the voltage thereon can be limited before commutation to an optimum operative value. The controller may be used with or without a bypass contactor, and control procedures are provided for safe operation in the latter circumstances.

REFERENCES:
patent: 3146356 (1964-08-01), Kidwell et al.
patent: 3492557 (1970-01-01), Brown

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