Inductively powered secondary assembly
A lamp assembly configured to inductively receive power from a primary coil. The lamp assembly includes a lamp circuit including a secondary and a lamp connected in series. In a first aspect, the lamp circuit includes a capacitor connected in series with the lamp and the secondary to tune the circuit to resonance. The capacitor is preferably selected to have a reactance that is substantially equal to or slightly less than the reactance of the secondary and the impedance of the lamp. In a second aspect, the lamp assembly includes a sealed transparent sleeve that entirely encloses the lamp circuit so that the transparent sleeve is fully closed and unpenetrated. The transparent sleeve is preferably the lamp sleeve itself, with the secondary, capacitor and any desired starter mechanism disposed within its interior.
1. An inductively powered secondary assembly comprising:
an inductive secondary to receive power from an inductive primary, the inductive secondary having a reactance;
a load disposed in series with the inductive secondary, the load having an impedance; and
a capacitor disposed in series with the inductive secondary and the load, the capacitor selected to have a reactance that is substantially equal to or slightly less than the sum of the impedance of the load and the reactance of the inductive secondary, whereby the load and the inductive secondary operate substantially at resonance.
2. The inductively powered secondary assembly of claim 1 wherein said inductive secondary is a coil of LITZ wire.
3. The inductively powered secondary assembly of claim 2 further including a sleeve surrounding and fully enclosing said inductive secondary, said load and said capacitor, said sleeve being unpenetrated.
4. The inductively powered secondary assembly of claim 1 wherein said inductive secondary is a coil of magnetic wire.
5. An inducively powered secondary assembly comprising:
an inductive secondary to receive power from an inductive primary, the inductive secondary having a reactance;
a load disposed in series with the inductive secondary, the load having an impedance that is substantially equal to the reactance of the inductive secondary; and
a capacitor disposed in series with the inductive secondary and the load, the capacitor selected to have a reactance that is substantially equal to or slightly less than the sum of the impedance of the load and the reactance of the inductive secondary, whereby the load and the inductive secondary operate substantially at resonance.
6. The inductively powered secondary assembly of claim 5 wherein said inductive secondary is a coil of LITZ wire.
7. The inductively powered secondary assembly of claim 6 further including a sleeve surrounding and fully enclosing said inductive secondary, said load and said capacitor, said sleeve being unpenetrated.
8. The inductively powered secondary assembly of claim 5 wherein said inductive secondary is a coil of magnetic wire.