D.c. pulse torquing system employing half-wave rectified a.c.

Claim 1

A PULSE-TORQUING SYSTEM, COMPRISING: MEANS TO GENERATE AN A.C. SIGNAL; A HALF-WAVE RECTIFIER CONNECTED TO RECTIFY SAID A.C. SIGNAL AND PRODUCE A SERIES OF PULSES; A GATE AND AN INVERTER GATE ELECTRICALLY CONNECTED IN PARALLEL BETWEEN SAID RECTIFIER AND TORQUER; POLARITY CONTROL CIRCUIT MEANS ELECTRICALLY CONNECTED TO, AND CONTROLLING, SAID GATES, SAID CIRCUIT MEANS HAVING AN INPUT AND BEING ADAPTED TO RESPOND TO THE POLARITY OF INPUTS SIGNAL APPLIED TO SAID INPUT TO ALTERNATELY ENABLE AND DISABLE SAID GATES IN ACCORDANCE WITH POLARITY CHANGES IN SAID APPLIED SIGNAL, WHEREBY INVERTED AND UN-INVERTED ENERGIZING PULSES ARE SELECTIVELY FED THROUGH SAID GATES TO SAID TORQUER; ADDITIONAL CIRCUIT MEANS, ELECTRICALLY CONNECTED BETWEEN SAID TORQUER AND A.C. SIGNAL-GENERATING MEANS, FOR DETECTING VARIATIONS IN THE IMPULSE CONTENT OF THE ENERGIZING PULSES SUPPLIED TO SAID TORQUER AND AFFECTING AMPLITUDE CHANGES IN SAID A.C. SIGNAL TO COUNTERACT SAID VARIATIONS; A VARIABLE GAIN AMPLIFIER IN SERIES WITH ONE OF SAID GATES; RESISTIVE IMPEDANCE MEANS ELECTRICALLY CONNECTED BETWEEN THE OUTPUTS OF SAID GATES AND THE INPUT OF SAID TORQUER; AN ADDITIONAL GATE HAVING AN INPUT CONNECTED ACROSS SAID IMPEDANCE MEANS; INTEGRATOR CIRCUIT MEANS ELECTRICALLY CONNECTED BETWEEN THE OUTPUT OF SAID ADDITIONAL GATE AND SAID VARIABLE GAIN AMPLIFIER, SAID INTEGRATOR CIRCUIT MEANS BEING OPERATIVE TO VARY THE GAIN OF THE AMPLIFIER BY AN AMOUNT AND IN A DIRECTION DEPENDENT UPON THE MAGNITUDE AND POLARITY, RESPECTIVELY, OF AN OUTPUT SIGNAL FROM SAID ADDITIONAL GATE; AND FREQUENCY DIVIDER CIRCUIT MEANS HAVING AN INPUT ELECTRICALLY CONNECTED TO THE OUTPUT OF SAID RECTIFIER AND AN OUTPUT ELECTRICALLY CONNECTED TO EACH OF SAID GATES, SAID FREQUENCY DIVIDER CIRCUIT MEANS GENERATING PERIODICALLY, AT A SUBMULTIPLE OF THE FREQUENCY OF SAID A.C. SIGNAL, A CONTROL SIGNAL EFFECTIVE TO ENABLE ALL OF SAID GATES SIMULTANEOUSLY.