Inrush current limiter
AssigneeThe Boeing Company
InventorLoren O. Criss
Life of this patent
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Abstract
A circuit for limiting the inrush current in DC to DC and DC to AC power supplies. The circuit utilizes a small capacitor for taking a charge which slowly turns on a FET transistor placed in series with a large filter capacitor; the slowly reducing resistance of the transistor provides the desired inrush current limiting.
Claims2
In combination in a power supply having a power source connected across a load and wherein an inductor is series connected between said power source and said load and a capacitor is connected across said load, an inrush current limiting circuit, the improvement comprising:
- a FET transistor having a gate electrode, said FET transistor connected in series circuit with said capacitor;
- a series circuit including a further capacitor and a resistor connected across said load, said gate electrode connected between said resistor and said further capacitor;
- and,
- a zener diode connected across said further capacitor.
A power supply circuit having inrush current limiting comprising in combination:
- a power source;
- an inductor;
- a load;
- said power source series connected with said inductor across said load;
- a filter capacitor;
- a FET transistor having a gate electrode, said FET transistor connected in series circuit with said filter capacitor, said series circuit coupled across said load;
- an RC circuit connected in parallel with said series circuit;
- and,
- said gate electrode coupled to said RC circuit.
Dependencies are inferred from the claim text.