Circuit and method for linear constant current control and LED device

A circuit for linear constant current control for an LED lamp, the circuit comprising:

• a linear network compensator configured for power compensation for an input linear power network;
• a triac dimmer detector configured to detect whether a silicon controlled rectifier dimmer is connected in;
• a reference subcircuit in connection with the linear network compensator and configured to generate a reference voltage value;
• an over-temperature protector in connection with the reference subcircuit and configured to reduce the reference voltage value when it is detected that a temperature reaches a preset value;
• a bleeder in connection with the triac dimmer detector and the reference subcircuit and configured to perform constant current bleed-off on the current passing therethrough when the triac dimmer is connected in;
• and
• a constant-current driver in connection with the reference subcircuit and configured to regulate the current passing therethorugh to realize constant current output.