Solid state lighting panels with variable voltage boost current sources
First Claim
1. A lighting system, comprising:
- at least three strings of solid state lighting devices that are respectively configured to emit at least a first light, a second light and a third light, respectively;
a digital control system that is configured to generate a first pulse width modulation (PWM) control signal and a second PWM control signal and that includes a closed loop control system that is configured to generate the first and second PWM control signals in response to sensor output signals generated by at least one sensor, the first and second PWM control signals operative to cause an on-state drive current to be supplied to ones of the at least three strings of solid state lighting devices; and
at least three current supply circuits coupled to the first, second and third strings, respectively,wherein each of the current supply circuits is configured to supply the on-state drive current to a respective string of the at least three solid state lighting devices in response to the first and second PWM control signals, andwherein each of the current supply circuits includes a controller having a control input, a first control output configured to provide the first PWM control signal, and a second control output configured to provide the second PWM control signal.
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Accused Products
Abstract
A lighting 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.
139 Citations
27 Claims
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1. A lighting system, comprising:
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at least three strings of solid state lighting devices that are respectively configured to emit at least a first light, a second light and a third light, respectively; a digital control system that is configured to generate a first pulse width modulation (PWM) control signal and a second PWM control signal and that includes a closed loop control system that is configured to generate the first and second PWM control signals in response to sensor output signals generated by at least one sensor, the first and second PWM control signals operative to cause an on-state drive current to be supplied to ones of the at least three strings of solid state lighting devices; and at least three current supply circuits coupled to the first, second and third strings, respectively, wherein each of the current supply circuits is configured to supply the on-state drive current to a respective string of the at least three solid state lighting devices in response to the first and second PWM control signals, and wherein each of the current supply circuits includes a controller having a control input, a first control output configured to provide the first PWM control signal, and a second control output configured to provide the second PWM control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
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18. A lighting system, comprising:
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a lighting panel including at least three strings of solid state lighting devices that are each configured to emit light; at least three current supply circuits coupled to the at least three 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 and a second PWM control signal that are supplied to the at least three 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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20. A lighting system, comprising:
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a plurality of strings of solid state lighting devices that are respectively configured to emit at least a first light and a second light, respectively; a digital control system that is configured to generate a first pulse width modulation (PWM) control signal and a second PWM control signal and that includes a closed loop control system that is configured to generate the first and second PWM control signals in response to sensor output signals generated by at least one sensor, the first and second PWM control signals operative to cause an on-state drive current to be supplied to ones of the plurality of strings of solid state lighting devices; and a plurality of current supply circuits coupled to the plurality of strings of solid state lighting devices, respectively, wherein each of the current supply circuits is configured to supply the on-state drive current to a respective string of the plurality of solid state lighting devices in response to the first and second PWM control signals, and wherein each of the current supply circuits includes a controller having a control input, a first control output configured to provide the first PWM control signal, and a second control output configured to provide the second PWM control signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification