Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1977-08-17
1979-02-06
Salce, Patrick R.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
307252F, 361198, 361203, H01H 4700
Patent
active
041387082
ABSTRACT:
A drive circuit for a solenoid pump comprises a series combination of a pump solenoid and a capacitor connected through a rectifier circuit with an a.c. source. The solenoid is shunted by another rectifier poled to pass a charging current to the capacitor. A thyristor is connected across the series combination, and is triggered into conduction, whereupon it short-circuits the series combination to permit a discharge of the capacitor through the solenoid and to prevent a current flow from the source to the capacitor, thus allowing a uniform control of the energy discharged by the capacitor. A trigger circuit for the thyristor comprises a relaxation oscillator including a programmable unijunction transistor, the conduction of which is controlled inversely to fluctuations in the source voltage.
REFERENCES:
patent: 2907929 (1959-10-01), Lawson, Jr.
patent: 3562598 (1971-02-01), Dodd
patent: 3582716 (1971-06-01), Traina
patent: 3942078 (1976-03-01), Simeau
patent: 4045714 (1977-08-01), MacLeod
Jidoshakiki Co. Ltd.
Salce Patrick R.
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