Adaptive power balancing in LED lamps

A method of controlling power supplied to a light source by a drive circuit in a lamp, comprising selectively disabling a power stage of the drive circuit and supplying power through an energy storage device when the power stage is disabled;

• wherein the power stage is disabled throughout the course of a selected period of a mains AC power cycle, wherein the selected period of the mains AC power cycle comprises a period during which the magnitude of the mains voltage has a maximum value;
• and wherein the selected period of the mains AC power cycle is defined by a threshold, so that the power stage is disabled when the magnitude of a mains voltage is equal to or exceeds the threshold;
• wherein the threshold is dynamically adjusted according to an operation of a transformer for use with the lamp to prevent a reset of the transformer;
• such that when the transformer is going into reset, the threshold is lowered to increase the selected period;
• and when the transformer is recovering the threshold is raised to decrease the selected period.

A method of controlling power supplied to a light source in a lighting system;

• comprising converting with an electronic transformer a mains voltage to a lamp operating voltage to be supplied to a lamp;
• coupling the lamp operating voltage with a lamp;
• and controlling power supplied by a drive circuit for a light source of the lamp comprising selectively disabling a power stage of the drive circuit and supplying power through an energy storage device when the power stage is disabled wherein the power stage is disabled throughout the course of a selected period of a mains AC power cycle, wherein the selected period of the mains AC power cycle comprises a period during which the magnitude of the mains voltage has a maximum value;
• and wherein the selected period of the mains AC power cycle is defined by a threshold, so that the power stage is disabled when the magnitude of a mains voltage is equal to or exceeds the threshold;
• wherein the threshold is dynamically adjusted according to the operation of the electronic transformer, to prevent a reset of the electronic transformer;
• such that when the transformer is going into reset, the threshold is lowered to increase the selected period;
• and when the transformer is recovering the threshold is raised to decrease the selected period.