Blocking circuit for thyristors

Details Blocking circuit for thyristors Blocking circuit for thyristors

H - Electricity

02

M

321/79

H02M 1/08 (2006.01) H02M 7/155 (2006.01) H03K 17/732 (2006.01)

Patent

CA 1061407

ABSTRACT A blocking circuit for thyristors comprises a DC power source coupled to a capacitor which is switched into a thyristor circuit by a switching transistor and a pair of auxiliary thyristors. A high power current pulse from the capacitor is applied to the thyristor for blocking purposes. A common blocking circuit may be switched into a plurality of thyristor circuits eliminating separate capacitors and power sources, a separate pair of the auxiliary thyristors being provided for each thyristor circuit to be controlled. In a second embodiment, a high power DC output voltage would be generated from a three phase current source by means of three full wave rectifiers coupled to achieve a charging process six times per cycle. This latter arrangement offers the possibility of saving the charging capacitor altogether as the rectified phases overlap with only a slight ripple.

245996

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