Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-03-16
1978-08-01
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307237, H03K 102
Patent
active
041045440
ABSTRACT:
A current limiting circuit for direct current power supplies comprises first and second transistor switches connected in series between the power supply and a load which control the passage of current therebetween, third and fourth transistor switches which control the first and second switches, respectively, and first and second control circuits which control the third and fourth switches. The first control circuit comprises a fifth transistor switch which controls the third and fourth switches, a current sensing resistor connected in series between the power supply and the first and second switches, a first voltage dividing circuit connected across the power supply which produces a first reference voltage corresponding to a predetermined current limit, and a comparator which compares the voltage produced across the current sensing resistor with the first reference voltage and produces an output which controls the fifth switch such that the first and second switches are closed unless the current being drawn by the load exceeds the predetermined limit. The second control circuit comprises a sixth transistor switch which also controls the third and fourth switches, a second voltage dividing circuit connected across the power supply which produces a second reference voltage corresponding to a predetermined minimum load voltage, and a comparator which compares the voltage produced across the load with the second reference voltage and produces an output which controls the sixth switch such that the first and second switches are open when the voltage across the load is below the predetermined value therefor.
REFERENCES:
patent: 3163814 (1964-12-01), Todd
patent: 3219912 (1965-11-01), Harrison
patent: 3723774 (1973-03-01), Rogers
Gardiner Donald A.
Heyman John S.
Sadowsky Gersten
The United States of America as represented by the Secretary of
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