Solid state lighting panels with variable voltage boost current sources
First Claim
1. A lighting panel system, comprising:
- a lighting panel including 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, wherein 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,wherein the current supply circuit comprises;
a charging inductor coupled to the voltage input terminal and an output capacitor coupled to the first output terminal;
a controller including the control input and first and second control outputs;
a first control transistor that is coupled to the first control output of the controller and that is configured to cause the charging inductor to be energized responsive to a first control signal from the controller; and
a second control transistor that is coupled to the second output terminal of the current supply circuit and that is configured to cause a voltage stored in the output capacitor to be applied to the first output terminal of the current supply circuit responsive to a second control signal from the controller; and
wherein 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.
3 Assignments
0 Petitions
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.
-
Citations
17 Claims
-
1. A lighting panel system, comprising:
-
a lighting panel including 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, wherein 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, wherein the current supply circuit comprises; a charging inductor coupled to the voltage input terminal and an output capacitor coupled to the first output terminal; a controller including the control input and first and second control outputs; a first control transistor that is coupled to the first control output of the controller and that is configured to cause the charging inductor to be energized responsive to a first control signal from the controller; and a second control transistor that is coupled to the second output terminal of the current supply circuit and that is configured to cause a voltage stored in the output capacitor to be applied to the first output terminal of the current supply circuit responsive to a second control signal from the controller; and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of generating an on-state drive current for driving a string of solid state light emitting devices in a lighting panel system, comprising:
-
energizing a charging inductor with an input voltage by activating a first control transistor coupled to the charging inductor with a first control signal from a controller; discharging energy stored in the charging inductor into an output capacitor; and applying a voltage on the output capacitor to the string of solid state lighting devices by activating a second control transistor coupled to the string with a second control signal from the controller; wherein current continuously flows through the charging inductor while the on-state drive current is supplied to the string of solid state light emitting devices. - View Dependent Claims (14, 15, 16, 17)
-
Specification