LED lighting device and driving method for the same
First Claim
1. An LED lighting device comprising:
- a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and
a control circuit for generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, and for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, whereinthe control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal.
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Accused Products
Abstract
It is provided an LED lighting device calibratable to 0 to 100% of wide range about a chromaticity and luminance of a illumination light by a simple configuration, and a driving method for the LED lighting device. The LED lighting device is provided with a first light-emitting unit and a second light-emitting unit differing a color temperature mutually, and a control circuit for executing a cyclic light/quench control of the first light-emitting unit and the second light-emitting unit, and for executing a light control of the first light-emitting unit and the second light-emitting unit by a PNM (Pulse Number Modulation) control in a fixed cycle so as to have a lighting period Ton for lighting/quenching the first light-emitting unit and the second light-emitting unit complementarily, and a quenching period Toff for quenching both the first light-emitting unit and the second light-emitting unit.
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Citations
20 Claims
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1. An LED lighting device comprising:
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a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and a control circuit for generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, and for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An LED lighting device comprising:
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a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and 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 generating first and second switching controls signal based on a chromaticity control signal and a luminance control signal, and 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, and a pulse number modulation control unit for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal. - View Dependent Claims (8, 9, 10)
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11. An LED lighting device comprising:
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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 generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, 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, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal. - View Dependent Claims (12, 13)
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14. An LED lighting device comprising:
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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 generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, 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 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, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal. - View Dependent Claims (15, 16)
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17. An LED lighting device comprising:
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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 generating first and second switching control signals based on a chromaticity control signal and a luminance control signal, and 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, for generating a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed, 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 and a quenching period for lighting/quenching the first light-emitting unit and the second light-emitting unit, according to the generated first and second switching control signals, 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, and further executing a light control of the first light-emitting unit and the second light-emitting unit by the pulse number modulation control according to the amount of variation of the inverse correlated color temperature, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal. - View Dependent Claims (18, 19)
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20. A driving method of an LED lighting device, the LED lighting device including a first light emitting diode and a second light emitting diode differing in a color temperature mutually, a microcomputer for executing a light/quench control of the first light emitting diode and the second light emitting diode, and a changing operation unit for executing an operation for changing a color temperature of illumination light, the driving method comprising:
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generating, by the microcomputer, first and second switching control signals based on a chromaticity control signal and a luminance control signal, and executing, by the microcomputer, a cyclic light/quench control of the first light emitting diode and the second light emitting diode so as to have a lighting period and a quenching period for lighting/quenching the first light emitting diode and the second light emitting diode, according to the generated first and second switching control signals; generating, by the microcomputer, a pulse number modulation output signal based on the chromaticity control signal and the luminance control signal, and executing a light control of the first light-emitting unit and the second light-emitting unit by a pulse number modulation control according to the first and second switching control signals on which the generated pulse number modulation output signal is superimposed; and determining, by the microcomputer, a length of the lighting period of the first light emitting diode and a length of the lighting period of the second light emitting diode 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, wherein the control circuit comprises a first driving circuit for output the first switching control signal, and a second driving circuit for output the second switching control signal.
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Specification