Improvements in or relating to the transformation of a direct current into a unidirectional pulsed current

摘要

1,094,593. Pulse generators. SOC. FRANCAISE DE MATERIEL ELECTRIQUE. June 18, 1965 [June 30, 1964], No. 25957/65. Heading H3T. [Also in Division H2] Power from a D.C. source to a load, e.g. an electric motor (see Division H2), is regulated by one or more thyristors which are extinguished by back biassing from an inductance/capacitance circuit (6, 7, Fig. 1, not shown), and are triggered from a variable frequency pulse generator. This comprises an " anti-overvoltage " circuit 22 and a stabilization stage 25 having a Zener diode 26; this supplies a relaxation oscillator 31, having a unijunction transistor 32, and a temperature correcting resistor 38, the frequency being controlled by a rheostat 42. The relaxation oscillator is transformer coupled to an amplifying stage 44, which also has a temperature compensating resistor 49 and whose output supplies a transformer 51 having secondaries connected in the triggering circuits of the thyristors.