A.c. amplified hall generator wattmeter

Claim 1

AN ELECTRONIC ALTERNATING-CURRENT POWER METERING SYSTEM, COMPRISING A HALL GENERATOR HAVING TWO INPUT CIRCUITS FOR RESPECTIVE CURRENT AND VOLTAGE INPUT MAGNITUDES OF THE ALTERNATING CURRENT TO BE METERED AND HAVING A MAGNETIC FIELD COIL IN ONE OF SAID INPUT CIRCUITS AND A FIELD-EXPOSED HALL PLATE IN SAID OTHER INPUT CIRCUIT AND A HALL-PLATE OUTPUT CIRCUIT, RECTIFIER MEANS CONNECTED IN ONE OF SAID INPUT CIRCUITS TO PROVIDE ONE OF SAID INPUT MAGNITUDES IN RECTIFIED CONDITION WHEREBY SAID HALL GENERATOR OPERATES AS A MODULATOR AND SAID OUTPUT CIRCUIT FURNISHES A MODULATED ALTERNATING VOLTAGE, AN AMPLIFIER CONNECTED IN SAID OUTPUT CIRCUIT, A DEMODULATOR CONNECTED TO SAID AMPLIFIER, INTEGRATING MEANS CONNECTED TO SAID DEMODULATOR, SAID INTEGRATING MEANS COMPRISING A COUNTING REACTOR INCLUDING TWO OPPOSITELY SWITCHED WINDINGS, INDICATING MEANS CONNECTED TO SAID INTEGRATOR FOR OPERATION IN ACCORDANCE WITH THE ACTIVE POWER VALVE OF THE ALTERNATING CURRENT, SAID INDICATING MEANS BEING A COUNTER, A FLIP-FLOP AMPLIFIER CONNECTED BETWEEN SAID INTEGRATING MEANS AND SAID COUNTER, AND PHASE-REVERSAL CIRCUIT MEANS RESPONSIVE TO SATURATION OF SAID COUNTING REACTOR AND CONNECTED TO SAID DEMODULATOR FOR REVERSING THE OUTPUT VOLTAGE OF SAID DEMODULATOR AT EACH SATURATION OF SAID COUNTING REACTOR, SAID COUNTING REACTOR INCLUDING SWITCHING MEANS FOR EACH WINDING, SAID SWITCHING MEANS HAVING SEMICONDUCTOR CIRCUITS AND SAID SEMICONDUCTOR CIRCUITS INCLUDING BIASING MEANS FOR MAKING THEM THRESHOLD-FREE.