Solid state lighting panels with variable voltage boost current sources
First Claim
1. A lighting panel system, comprising:
- a lighting panel including a first string of solid state lighting devices configured to emit red light, a second string of solid state lighting devices configured to emit green light, and a third string of solid state lighting devices configured to emit blue light;
at least three current supply circuits coupled to the first, second and third strings, respectively, wherein each of the current supply circuits comprises a variable voltage boost, constant current power supply circuit configured to operate in continuous current mode; and
a pulse width modulation (PWM) controller that is coupled to the current supply circuits and that is configured to generate, for ones of the current supply circuits, a first PWM control signal that corresponds to a voltage boost and a second PWM control signal that corresponds to an on-state drive current that is supplied to the first, second and third strings, respectively, wherein the PWM controller comprises a closed loop digital control system that is configured to generate the first PWM control signal and/or the second PWM control signal in response to sensor output signals generated by at least one light sensor in response to light output by the lighting panel.
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Accused Products
Abstract
A lighting panel system includes a lighting panel having a string of solid state lighting devices and a current supply circuit having a voltage input terminal, a control input terminal, and first and second output terminals coupled to the string of solid state lighting devices. The current supply circuit is configured to supply an on-state drive current to the string of solid state lighting devices in response to a control signal. The current supply circuit includes a charging inductor coupled to the voltage input terminal and an output capacitor coupled to the first output terminal. The current supply circuit is configured to operate in continuous conduction mode in which current continuously flows through the charging inductor while the on-state drive current is supplied to the string of solid state light emitting devices.
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Citations
15 Claims
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1. A lighting panel system, comprising:
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a lighting panel including a first string of solid state lighting devices configured to emit red light, a second string of solid state lighting devices configured to emit green light, and a third string of solid state lighting devices configured to emit blue light; at least three current supply circuits coupled to the first, second and third strings, respectively, wherein each of the current supply circuits comprises a variable voltage boost, constant current power supply circuit configured to operate in continuous current mode; and a pulse width modulation (PWM) controller that is coupled to the current supply circuits and that is configured to generate, for ones of the current supply circuits, a first PWM control signal that corresponds to a voltage boost and a second PWM control signal that corresponds to an on-state drive current that is supplied to the first, second and third strings, respectively, wherein the PWM controller comprises a closed loop digital control system that is configured to generate the first PWM control signal and/or the second PWM control signal in response to sensor output signals generated by at least one light sensor in response to light output by the lighting panel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A lighting panel system, comprising:
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a lighting panel including a first string of solid state lighting devices configured to emit red light, a second string of solid state lighting devices configured to emit green light, and a third string of solid state lighting devices configured to emit blue light; at least three current supply circuits coupled to the first, second and third strings, respectively, wherein each of the current supply circuits comprises a variable voltage boost, constant current power supply circuit configured to operate in continuous current mode; and a pulse width modulation (PWM) controller that is coupled to the current supply circuits and that is configured to generate, for ones of the current supply circuits, a first PWM control signal that corresponds to a voltage boost and a second PWM control signal that corresponds to an on-state drive current that is supplied to the first, second and third strings, respectively, wherein each of the current supply circuits comprises; a first control transistor including a control terminal coupled to a first control output of the PWM controller, and a second control transistor coupled to an output terminal of the current supply circuit and having an input coupled to a second control output of the PWM controller.
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Specification