JP2008243641A5

JP2008243641A5 -

Info

Publication number: JP2008243641A5
Application number: JP2007083421A
Authority: JP
Filing date: 2007-03-28
Publication date: 2010-04-22
Anticipated expiration: 2027-03-28

Claims

A light source circuit having a first light source unit and a second light source unit;
A power output circuit for supplying power to the light source circuit;
A current detection circuit for detecting a sum of a current flowing through the first light source unit and a current flowing through the second light source unit;
A power output control circuit for controlling the output voltage to the light source circuit of the power output circuit by outputting a voltage giving a specific gain to the voltage applied to the current detection circuit to the power output circuit;
An open failure detector for detecting a disconnection in the light source circuit as an open failure;
When the open failure detection unit detects an open failure of the first light source unit, a current having the same magnitude as the current flowing in the second light source unit before the open failure of the first light source unit is A gain control unit that changes the specific gain of the power output control circuit to flow to the second light source unit after an open failure of the first light source unit;
A lighting device comprising:

The first light source unit includes a light source unit A and a light source unit B,
The second light source unit has a light source unit C and a light source unit D,
The lighting device further includes:
A first balancer circuit that balances the current flowing through the light source unit A and the current flowing through the light source unit B;
A second balancer circuit that balances the current flowing through the light source unit C and the current flowing through the light source unit D;
The lighting device according to claim 1, further comprising:

The lighting device further includes:
When the open failure detection unit detects an open failure of the first light source unit, the open failure detection unit includes a switch control unit that cuts off power supply from the power output circuit to the first light source unit. The lighting device according to claim 1 or 2 .

A light source circuit having a first light source unit having a light source unit A and a light source unit B, a second light source unit having a light source unit C and a light source unit D;
A power output circuit for supplying power to the light source circuit;
A first balancer circuit that balances the current flowing through the light source unit A and the current flowing through the light source unit B;
A second balancer circuit that balances the current flowing through the light source unit C and the current flowing through the light source unit D;
A current detection circuit for detecting a sum of a current flowing through the first light source unit and a current flowing through the second light source unit;
A power output control circuit that controls an output voltage of the power output circuit to the light source circuit according to a sum of currents detected by the current detection circuit;
A lighting device comprising:

The lighting device further includes:
Battery,
A power supply switching unit that detects the presence or absence of a power failure for a commercial power source that supplies power to the power output circuit, and switches the power supply source to the power output circuit from the commercial power source to the battery when a power failure is detected. The lighting device according to any one of claims 1 to 4, wherein the lighting device is provided.

Claims 1 to 5, characterized in that each of the light source unit A and the light source unit B and the light source unit C and the light source unit D is connected a plurality of LED (Light Emitting Diode) in series The lighting device in any one of.

The lighting device according to any one of claims 1 to 6 ,
A first display surface that is turned on using the first light source unit of the lighting device as a light source;
A second display surface that turns on using the second light source unit of the lighting device as a light source ;
A display device comprising:

The display device according to claim 7, wherein the light source unit A of the first light source unit and the light source unit B of the first light source unit turn on the first display surface half by half.

The lighting device according to any one of claims 1 to 6 ,
An instrument body that houses the lighting device ;
A lighting apparatus comprising: