Systems and methods for temperature control in light-emitting-diode lighting systems

A system controller for regulating one or more currents, the system controller comprising:

• a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature;
• and
• a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes;
• wherein the modulation-and-driver component is further configured to:
• in response to the detected temperature increasing to become larger than a first temperature threshold but remaining smaller than a second temperature threshold, change the drive signal to reduce the drive current approximately according to an exponential function of the detected temperature, the first temperature threshold being smaller than the second temperature threshold.

A method for regulating one or more currents, the method comprising:

• detecting a temperature;
• generating a thermal detection signal based at least in part on the detected temperature;
• receiving the thermal detection signal;
• and
• generating a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes;
• wherein the generating the drive signal based at least in part on the thermal detection signal to close or open the switch to affect the drive current associated with the one or more light emitting diodes includes:
• in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generating the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold;
• in response to the detected temperature increasing to become equal to or larger than the second temperature threshold, changing the drive signal to reduce the drive current from the first current magnitude to a second current magnitude, the second current magnitude being smaller than the first current magnitude;
• in response to the detected temperature decreasing from the second temperature threshold but remaining larger than the first temperature threshold, generating the drive signal to keep the drive current at the second current magnitude;
• and
• in response to the detected temperature decreasing to become equal to or smaller than the first temperature threshold, changing the drive signal to increase the drive current from the second current magnitude to the first current magnitude.

A method for regulating one or more currents, the method comprising:

• detecting a temperature;
• generating a thermal detection signal based at least in part on the detected temperature;
• receiving the thermal detection signal;
• and
• generating a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes;
• wherein the generating the drive signal based at least in part on the thermal detection signal to close or open the switch to affect the drive current associated with the one or more light emitting diodes includes:
• in response to the detected temperature increasing to become larger than a first temperature threshold but remaining smaller than a second temperature threshold, changing the drive signal to reduce the drive current approximately according to an exponential function of the detected temperature, the first temperature threshold being smaller than the second temperature threshold.