Patent ID: 8779679

Claim:
An LED lamp including a pair of input terminal parts; a rectifier circuit unit rectifying an AC, inputted from the outside to the pair of input terminal parts, to a DC; and an LED unit emitting light by electrification of the DC outputted from the rectifier circuit unit; the LED lamp having: a variable inductance unit, in a circuit between the pair of input terminal parts and the rectifier circuit unit, for causing the AC to flow from one of the pair of input terminal parts to the other input terminal part through the rectifier circuit unit; a current detection unit, in a circuit between the rectifier circuit unit and the LED unit, for detecting a magnitude of the DC flowing through the LED unit; an inductance variable control unit for making an inductance value of the variable inductance unit variable according to the magnitude of the DC detected by the current detection unit; and a PWM control unit, in a circuit between the rectifier circuit unit and the LED unit, capable of PWM control of a current flowing through the LED unit according to a duty ratio; wherein the PWM control unit is switchable between a case where the PWM control of the current flowing through the LED unit is performed, and a case where PWM control of the current flowing through the LED unit is not performed, according to a frequency of the external AC inputted to the pair of input terminal parts; and wherein, in the case where the PWM control unit does not perform PWM control, the current detection unit detects the magnitude of the DC flowing through the LED unit, and the inductance variable control unit makes the inductance value of the variable inductance unit variable according to the magnitude of the DC.