LIGHTING DEVICE, POWER TRANSFER DEVICE, AND LUMINAIRE
First Claim
1. A lighting device comprising:
- a power supplying unit that supplies power contactlessly; and
a lighting unit operable by power supplied by the power supplying unit, whereinthe power supplying unit comprises;
a primary coil having a terminal electrically connected to an output terminal of an output convertor that rectifies an alternating voltage supplied by an AC power source;
a switch having a terminal electrically connected to another terminal of the primary coil and another terminal electrically connected to a reference potential; and
a drive circuit that feeds to the primary coil an alternating current with a switching frequency based on an output voltage of the convertor by performing an on/off switching on the switch with a switching frequency higher than a frequency of an AC power source, whereinthe lighting unit comprises;
a secondary coil; and
a lighting circuit that causes a light source to emit light using a power generated by an electromagnetic induction according to the alternating current passing through the primary coil upon receipt of the power by the secondary coil.
1 Assignment
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Accused Products
Abstract
A lighting device includes a power supplying unit that supplies power and a lighting unit operable using power supplied by power supplying unit. Power supplying unit includes: primary coil electrically connected to an output terminal of an output convertor that rectifies an alternating current supplied by an AC power source; and inverter circuit. Inverter circuit feeds to primary coil an alternating current with a determined frequency higher than a frequency of the AC power source based on an output voltage of the convertor. Lighting unit includes a secondary coil and lighting control circuit. Upon receipt of power generated by electromagnetic induction invoked by alternating current passing through primary coil in secondary coil, lighting control circuit causes an LED or other light source to emit light with power.
14 Citations
8 Claims
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1. A lighting device comprising:
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a power supplying unit that supplies power contactlessly; and a lighting unit operable by power supplied by the power supplying unit, wherein the power supplying unit comprises; a primary coil having a terminal electrically connected to an output terminal of an output convertor that rectifies an alternating voltage supplied by an AC power source; a switch having a terminal electrically connected to another terminal of the primary coil and another terminal electrically connected to a reference potential; and a drive circuit that feeds to the primary coil an alternating current with a switching frequency based on an output voltage of the convertor by performing an on/off switching on the switch with a switching frequency higher than a frequency of an AC power source, wherein the lighting unit comprises; a secondary coil; and a lighting circuit that causes a light source to emit light using a power generated by an electromagnetic induction according to the alternating current passing through the primary coil upon receipt of the power by the secondary coil. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power transfer device that contactlessly supplies power to a luminaire which includes:
- a secondary coil and a lighting circuit that cause a light source to emit light using power received by the secondary coil, the device comprising;
a primary coil having a terminal electrically connected to an output terminal of an output convertor that rectifies an alternating voltage supplied by an AC power source; a switch having a terminal electrically connected to another terminal of the primary coil and another terminal electrically connected to a reference potential; and a drive circuit that feeds an alternating current with a switching frequency based on an output voltage of the convertor in the primary coil by performing an on/off switching of the switch with a switching frequency higher than a frequency of the AC power source.
- a secondary coil and a lighting circuit that cause a light source to emit light using power received by the secondary coil, the device comprising;
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8. A luminaire operable using power received by a power transfer device which includes:
- a primary coil having a terminal electrically connected to an output terminal of an output convertor that rectifies an alternating voltage supplied by an AC power source;
a switch having a terminal electrically connected to another terminal of the primary coil and another terminal electrically connected to a reference potential; and
a drive circuit that feeds an alternating current to the primary coil with a switching frequency based on an output voltage of the convertor by performing an on/off switching of the switch with a switching frequency higher than a frequency of an AC power source, the luminaire comprising;a secondary coil; and a lighting circuit that causes a light source to emit light using a power generated by an electromagnetic induction according to the alternating current passing through the primary coil upon receipt of the power by the secondary coil.
- a primary coil having a terminal electrically connected to an output terminal of an output convertor that rectifies an alternating voltage supplied by an AC power source;
Specification