Patent ID: 8872434
Filing Date: 2014-10-28
Classification: H05B

Abstract:
1. A constant-current-drive LED module device, comprising: a rectifier receiving and rectifying an alternating current power source and including four diodes connected in a bridge configuration, the rectifier having input terminals, a first output terminal and a second output terminal; a bidirectional LED module unit of which a first end is connected to one of the input terminals of the rectifier and a second end is connected to an alternating current power source; a charging and discharging unit charging and discharging the alternating current power source and including a resistor-capacitor series circuit, the resistor-capacitor series circuit being connected with the bidirectional LED module unit in parallel; a switching unit connected between the first output terminal of the rectifier and the second output terminal of the rectifier and switched by a pulsating current output of the rectifier; a control voltage output unit detecting load current flowing in the bidirectional LED module unit and outputting a first level driving voltage and a second level driving voltage according to a magnitude of the load current; and a constant current driver controlled by the first level driving voltage and the second level driving voltage to provide constant current.