LED lighting device and driving method for the same
First Claim
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1. A control circuit for executing a cyclic light/quench control of an LED lighting device,the LED lighting device comprising a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually,the control circuit comprising a first driving circuit and a second driving circuit, whereinthe 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 the control circuit is configured 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 first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal.
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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.
29 Citations
17 Claims
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1. A control circuit for executing a cyclic light/quench control of an LED lighting device,
the LED lighting device comprising a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually, the control circuit comprising a first driving circuit and a second driving circuit, wherein the 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 the control circuit is configured 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 first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal.
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5. A control circuit for executing a cyclic light/quench control of an LED lighting device,
the LED lighting device comprising a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually, the control circuit comprising a first driving circuit and a second driving circuit, wherein the control circuit is configured for executing a light/quench control of the first light-emitting unit and the second light-emitting unit, the control circuit is configured for 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, whereinthe first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal. - View Dependent Claims (6, 7, 8)
- 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
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9. A control circuit for executing a cyclic light/quench control of an LED lighting device,
the 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,the control circuit comprising a first driving circuit and a second driving circuit, wherein the control circuit is configured 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, the control circuit is configured 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 first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal. - View Dependent Claims (10, 11)
- a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and
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12. A control circuit for executing a cyclic light/quench control of an LED lighting device,
the 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,the control circuit comprising a first driving circuit and a second driving circuit, wherein the control circuit is configured 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, the control circuit is configured 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 first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal. - View Dependent Claims (13, 14)
- a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and
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15. A control circuit for executing a cyclic light/quench control of an LED lighting device,
the 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,the control circuit comprising a first driving circuit and a second driving circuit, wherein the control circuit is configured 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 is configured for 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, whereinthe first driving circuit is configured for output the first switching control signal, and the second driving circuit is configured for output the second switching control signal. - View Dependent Claims (16, 17)
- a first light-emitting unit and a second light-emitting unit differing in a color temperature mutually; and
Specification
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Current AssigneeIRIS Ohyama Incorporated (Oyama KK)
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Original AssigneeROHM Co., Ltd.
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InventorsMizuno, Jun
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Primary Examiner(s)Le, Tung X
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Application NumberUS14/190,251Publication NumberTime in Patent Office405 DaysField of Search315/209.R, 315/246, 315/250, 315/287, 315/291, 315/294, 315/299, 315/307, 315/308, 315/309, 315/312, 315/360US Class Current315/307CPC Class CodesH05B 45/20 Controlling the colour of t...H05B 45/40 Details of LED load circuitsH05B 45/46 having LEDs disposed in par...H05B 47/10 Controlling the light sourceY02B 20/30 Semiconductor lamps, e.g. s...
