Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-04-19
1977-10-04
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307252M, 318345G, 363135, H03K 1708
Patent
active
040526259
ABSTRACT:
There is disclosed an improved switching circuit with overload protection for transforming a source of direct current power into a pulsating voltage of constant frequency and variable pulse duration adapted to be connected through a load to a first controllable rectifier of the switching circuit which in turn is connected through a current sensing resistor to a common circuit ground. The gate electrode of the first controllable rectifier is connected to a source of constant frequency pulses of variable duration. The secondary winding of a current transformer is connected from the common circuit ground in series with a diode, the cathode of which is connected to the anode of a second controllable rectifier, the cathode of the second controllable rectifier being connected to the common circuit ground. The gate of the second controllable rectifier is coupled to a source of pulses which are the exact complement to the pulses applied to the gate of the first controllable rectifier. The primary of the transformer is connected from the common circuit ground in series with a charging capacitor, which in turn is connected to the anode of the first controllable rectifier. The anodes of the first and second controllable rectifiers are connected through a "turn-off" capacitor. A first comparator amplifier has an input connected to the junction of the current sensing resistor and the first controllable rectifier and an output connected through an integrating circuit to a second comparator amplifier, the output of which is connected to a power contactor for applying and removing power to the switching circuit.
REFERENCES:
patent: 3238418 (1966-03-01), Heft
Madsen Raymond L.
Rasco Marcus S.
Zazworsky John
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