LED lamp and illumination device including the LED lamp

摘要

In an LED lamp according to one embodiment of the present invention, a PWM control unit 25 performs PWM control of a current i flowing through an LED unit 24 using by driving a pulse at a frequency higher than a predetermined frequency when a frequency of an external alternating current inputted between input terminal parts 20a, 20b is lower than the predetermined frequency, and does not perform PWM control of the current i flowing through the LED unit 24 when a frequency of the external AC inputted between the input terminal parts 20a, 20b is higher than the predetermined frequency. Accordingly, by replacing a previously mounted fluorescent lamp, the LED unit drives pulses at a high frequency and lights up for illumination, regardless of whether a ballast of an illumination device is of a glow starter, rapid starter or inverter lighting type.

主权项

1. An LED lamp including a pair of input terminal parts, a rectifier circuit unit rectifying an AC inputted from 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 wherein:
a PWM control unit capable of performing PWM control of a current to flow through the LED unit according to a duty ratio is provided in a circuit between the rectifier circuit unit and the LED unit; 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 the PWM control of the current flowing through the LED unit is not performed, according to a frequency of external AC inputted to the pair of input terminal parts; and the PWM control unit performs the PWM control of the current flowing through the LED unit by driving a pulse at a frequency higher than a predetermined frequency when the frequency of the external AC inputted to the pair of input terminal parts is lower than the predetermined frequency, and does not perform the PWM control of the current flowing through the LED unit when the frequency of the external AC inputted to the pair of input terminal parts is higher than the predetermined frequency.