LED tube

• Main Authors: Pu, Jizhong, Gan, Caiying, Cao, Shengjun
• Format: Patent
• Language: English
• Published: 14.07.2020
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; PULSE TECHNIQUE

The present invention discloses an LED lamp tube, comprising a driving circuit controlled by a switch when used, the driving circuit comprises: a dimming controller having a switch state monitoring port and a power supply port, and the power supply voltage is gradually formed after the switch is disconnected. When the switch is turned on again, if the supply voltage is between the first set value and the second set value, the output of the drive signal is the same as the signal when the switch is turned off, so that the current flowing through the LED light source remains unchanged. If the supply voltage is lower than the second set value, it outputs a dynamically changing driving signal, so that the current flowing through the LED light source gradually changes from the first extreme value to the second extreme value; and the power conversion unit is configured to receive the drive signal and provide energy to the LED light source. The LED lamp of the present invention can achieve dimming function by only operating the power switch, and does not need to modify the original circuit, and is easy to implement.