Circuit having improved firing angle symmetry for ignition...

H - Electricity – 02 – M

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321/96

H02M 7/12 (2006.01) H02M 1/084 (2006.01)

Patent

CA 1148215

ABSTRACT OF THE DISCLOSURE Ignition control signals for a multipulse controlled rectifier are combined in a sequence which is fed through a first time delay stage to a phase control circuit having a voltage-controlled oscillator which generates a phase- locked, gated, highly accurate square-wave oscillation as a trigger pulse series. The ignition control signals and the trigger pulse series of the vol- tage-controlled oscillator are conjunctively coupled in blocking gates and then amplified to form firing (ignition) pulses. A second time delay stage is pro- vided for safety, in the event of dynamic control processes, and follows the first time delay stage. The output signals of the second time delay stage are linked to the ignition control signals in additional blocking gates and are subsequently amplified. Should the phase control circuit be unable to follow the changes of the ignition control signals in the event of dynamic changes in the control processes, the ignition pulse formed after the response delay of the second time delay stage is utilized.

353007

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