Abstract: An LED lighting device 1 lights LED blocks 4a and 4b which correspond to a plurality of functions of an illuminator such as headlights and are connected in series. The LED blocks 4a and 4b are connected in series with a current converting unit 5. While the LED blocks 4a and 4b are supplied with a current Ia from a single DC/DC converter unit 3, the LED block 4b is supplied with a current Ib that passes through conversion by the current converting unit 5 and that differs from the current Ia the DC/DC converter unit 3 outputs. Thus, the LED blocks 4a and 4b are each lit with appropriate brightness.

Abstract: An LED lighting device 1 lights LED blocks 4a and 4b which correspond to a plurality of functions of an illuminator such as headlights and are connected in series. The LED blocks 4a and 4b are connected in series with a current converting unit 5. While the LED blocks 4a and 4b are supplied with a current Ia from a single DC/DC converter unit 3, the LED block 4b is supplied with a current Ib that passes through conversion by the current converting unit 5 and that differs from the current Ia the DC/DC converter unit 3 outputs. Thus, the LED blocks 4a and 4b are each lit with appropriate brightness.

Abstract: A tin-plated surface 7 is formed by hot-dip coating a solder containing a lead-free tin as the main component on an electrode 6 of a board 4 with which a connector terminal 1 comes in contact.

Abstract: A light emitting diode apparatus that includes a single DC/DC converter section that has two circuits connected in parallel: a flyback type boosting circuit and a boosting circuit. The former includes a transformer and a switching device and the like to boost DC voltage of a DC power supply, and the latter includes a transformer and a switching device and the like to do likewise. A control section carries out switching control of the switching devices and in such a manner that shifts from each other the phases of current Ida and current Idb to be supplied from the two boosting circuits and to a plurality of LED and the like connected in series in a light emitting section.

Abstract: A tin-plated surface 7 is formed by hot-dip coating a solder containing a lead-free tin as the main component on an electrode 6 of a board 4 with which a connector terminal 1 comes in contact.

Abstract: A single DC/DC converter section 2 has two circuits connected in parallel: a flyback type boosting circuit 2A and a boosting circuit 2B. The former includes a transformer 2a and a switching device 2b and the like to boost DC voltage of a DC power supply 1, and the latter includes a transformer 2d and a switching device 2e and the like to do likewise. A control section 4 carries out switching control of the switching devices 2b and 2e in such a manner that shifts from each other the phases of current Ida and current Idb to be supplied from the two boosting circuits 2A and 2B to a plurality of LED 3a and the like connected in series in a light emitting section 3.