Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-01-28
1977-06-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
323 18, F02P 1700
Patent
active
040328422
ABSTRACT:
An improved high voltage pulse power supply for a spark plug test fixture. AC line voltage is applied through a voltage step-down transformer, a half wave rectifier and an electronic switch to the primary winding of a conventional ignition coil. During the rise time of positive half cycles, the rectified voltage is applied through the electronic switch to the ignition coil primary. As the positive half cycle begins to fall towards the zero crossover, the electronic switch is opened. The magnetic field collapse in the ignition coil produces a high voltage negative pulse which is applied to a spark plug under test. The peak voltage of the negative pulse is adjusted by controlling the peak current in the ignition coil primary.
REFERENCES:
patent: 1695557 (1928-12-01), Myers
patent: 2603685 (1952-07-01), Bychinsky
patent: 3360718 (1967-12-01), Williams
Callahan Richard E.
Green Sam J.
Champion Spark Plug Company
Krawczewicz Stanley T.
Todd, Jr. Oliver E.
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