LED lighting device and driving method for the same

An LED lighting device comprising:

• a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually;
• and
• a changing operation unit for executing an operation for changing a color temperature of illumination light;
• a control circuit for executing a cyclic light/quench control of the first light/emitting unit and the second light-emitting unit so as to have a lighting period for lighting/quenching the first light-emitting unit and the second light-emitting unit and the second light-emitting unit, and for determining a length of the lighting period of the first light-emitting unit and a length of the lighting period of the second light-emitting unit in the lighting period in response to the operation in the changing operation unit so that an amount of variation of an inverse correlated color temperature of the illumination light with respect to an amount of the operation of the changing operation unit becomes linear.

An LED lighting device comprising:

• a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually;
• and
• a changing operation unit for executing an operation for changing a color temperature of illumination light;
• a control circuit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit so as to have a lighting period for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period quenching both the first light-emitting unit and the second light-emitting unit, and for determining a length of the lighting period of the first light-emitting unit and a length of the lighting period of the second light-emitting unit in the lighting period, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control in a fixed cycle, in response to the operation in the changing operation unit so that an amount of variation of an inverse correlated color temperature of the illumination light with respect to an amount of the operation of the changing operation unit becomes linear.

An LED lighting device comprising:

• a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually;
• and
• a changing operation unit for executing an operation for changing a color temperature of illumination light;
• a control circuit for executing a light/quench control of the first light-emitting unit and the second light-emitting unit, the control circuit including a light/quench control unit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit, and further determining a length of the lighting period of the first light-emitting unit and a length of the lighting period of the second light-emitting unit in the lighting period in response to the operation in the changing operation unit so that an amount of variation of an inverse correlated color temperature of the illumination light with respect to an amount of the operation of the changing operation unit becomes linear so as to have a lighting period for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period for quenching both the first light-emitting unit and the second light-emitting unit, and a pulse number modulation control unit for executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control in a fixed cycle, and further executing a light control of the first light-emitting unit and the second light-emitting unit by the pulse number modulation control in the fixed cycle according to the amount of variation of the inverse correlated color temperature.