Generator speed matcher using direct sampling

Abstract

Abstract SQUARED BUS AND SQUARED GENERATOR VOLTAGES ARE APPLIED TO TWO AND GATES RESPECTIVELY, BUS AND GENERATOR SAMPLING PULSES ARE PRODUCED WHENEVER THE SQUARE WAVES UNDERGO A POSITIVE TO ZERO TRANSITION, THE BUS SAMPLING PULSED BEING APPLIED TO THE AND GATE WHICH HAS THE GENERATOR SQUARE WAVE APPLIED THERETO AND THE GENERATOR SAMPLING PULSES BEING APPLIED TO THE AND GATE WHICH HAS THE BUS SQUARE WAVE APPLIED THERETO, SO THAT THE BUS SAMPLES THE GENERATOR AND THE GENERATOR SAMPLES THE BUS OR ENERGIZED LINE. WHEN THE GENERATOR VOLTAGE IS LAGGING THE BUS VOLTAGE, THE OUTPUT OF ONE AND GATE IS A SERIES OF POSITIVE PULSES WHILE THE OUTPUT OF THE OTHER AND GATE REMAINS AR GROUND LEVEL. IF THE GENERATOR VOLTAGE IS LEADING THE BUS VOLTAGE, THE OUTPUT OF THE OTHER AND GATE IS A SERIES OF POSITIVE PULSES WHILE THE OUTPUT OF THE FIRST NAMED AND GATE REMAINS AT GROUND. THE OUTPUTS OF THE TWO AND GATES ARE FED TO OPPOSITE INPUTS OF A BISTABLE PLISHED BY THE FIRST POSITIVE PULSES FROM THE RESPECTIVE AND GATES. A PHASE DIFFERENCE WAVE FORM IS FED TO A LEVEL DETECTOR AND A PULSE SHAPER OR GENERATOR WHICH PRODUCES A SAMPLING PULSE WHEN THE PHASE DIFFERENCE BETWEEN THE BUS AND THE GENERATOR IS 50*. THIS LAST NAMED PULSE IS USED IN TWO NOR CIRCUITS T SAMPLE BOTH OUTPUTS OF THE BISTABLE. IF THE BISTABLE IS IN THE SET STATE WHEN THIS SAMPLING PULSE OCCURS THE OUTPUT OF A FIRST NOR GATE IS A LOGICAL ONE AND A "RAISE" PULSE STRETCHER IS ACTUATED FOR PRODUCING A SIGNAL WHICH IS UTILIZED TO INCREASE SPEED. IF THE BISTABLE IS IN THE RESET STATE WHEN THE 50* SAMPLING PULSE OCCURS THE OUTPUT OF A SECOND NOR GATE IS A LOGICAL ONE, AND A "LOWER" PULSE STRETCHER WILL BE ACTUATED, AND A SIGNAL PRODUCED TO REDUCE THE SPEED OF THE GENERATOR. IF THE BUS AND GENERATOR ARE TOO CLOSELY MATCHED AND THE TIME INTERVAL BETWEEN TWO SUCCESSIVE 50* PHASE DIFFERENCE POINTS IS TOO LONG THE "RAISE" PULSE PRODUCER IS ACTUATED. IN ANOTHER EMBODIMENT, SQUARED WAVEFORM REPRESENTING WAVEFORMS PLUS A THIRD SQUARE WAVEFORM REPRESENTING THE BUS AFTER PHASE SHIFTING ARE OBTAINED, AND APPLIED TO FOUR AND CIRCUITS WHICH TOGETHER WITH A BISTABLE CIRCUIT AND PULSE STRETCHERS PROVIDE "RAISE" AND "LOWER" PULSES OR CHAINS OF PULSES DEPENDING ON THE RALTIONSHIPS OF THE GENERATOR AND BUS FREQUENCIES AND PHASE.

Inventors

• 👤 Francis T Thompson
• 👤 Tibor Rubner

Bibliographic Details