Driving device for LED and the driving method thereof

摘要

The present invention discloses a driving device for LED and the driving method thereof, includes: a bridge rectifier, at least one LED-lamp bunch and LED-lamp group and P-type switching module and N-type driving module, and a logic controller; the LED-lamp bunch and group are connected orderly in series; the bridge rectifier's positive end connects to the LED-lamp bunch's anode, while a negative end gets grounded; the logic controller connects to the anode and cathode of LED-lamp bunch through the P-type switching module respectively, the cathode of LED-lamp group through N-type driving module, and the negative input end of the bridge rectifier; by controlling the N-type driving module and P-type switching module makes the number of lit-on LED-lamps change following the rectified input signal voltage changes; thus its efficiency is improved and easy to be integrated into chips.

主权项

1. A driving device for an LED, wherein, said driving device for an LED includes:
a bridge rectifier, at least one LED-lamp bunch, at least one LED-lamp group, at least one P-type switching module, at least one N-type driving module, and a logic controller; said bridge rectifier, applied to rectify input signals; said P-type switching module, applied to drive said LED-lamp bunch; said N-type driving module, applied to drive said LED-lamp group; said logic controller, applied to control said P-type switching module and N-type driving module; wherein, the number of said LED-lamp bunch is the same as that of said P-type LED-lamp switching module; while the number of said LED-lamp groups is the same as that of said N-type driving module; said LED-lamp bunch connects to said LED-lamp group in serial; an anode of said LED-lamp bunch connects to a positive output end of said bridge rectifier, while a negative output end of said bridge rectifier gets grounded; a cathode of said LED-lamp bunch connects to the anode of said LED-lamp group; said logic controller connects to the anode and cathode of said LED-lamp bunch, respectively, through said P-type switching module; and said logic controller connects to the cathode of the LED-lamp group, through said N-type driving module; while said logic controller also connects to a negative input end of said bridge rectifier; 2 LED-lamp bunches, that is, a first LED-lamp bunch and a second LED-lamp bunch, respectively; 2 P-type switching modules, that is, a first P-type switching module and a second P-type switching module, respectively; 4 LED-lamp groups, that is, a first LED-lamp group, a second LED-lamp group, a third LED-lamp group and a fourth LED-lamp group, respectively; 4 N-type driving modules, that is, a first N-type driving module, a second N-type driving module, a third N-type driving module and a fourth N-type driving module, respectively; wherein said first LED-lamp bunch, second LED-lamp bunch, first LED-lamp group, second LED-lamp group, third LED-lamp group and fourth LED-lamp group are connecting one by one in the sequence; the anode of said first LED-lamp bunch connects to the positive output end of said bridge rectifier, while the negative output end of said bridge rectifier gets grounded; said logic controller connects to the anode and cathode of said first LED-lamp bunch, through said first P-type switching module, respectively; the cathode of said first LED-lamp bunch connects to the anode of said second LED-lamp bunch; said logic controller connects to the anode and cathode of said second LED-lamp bunch, through said second P-type switching module, respectively; the cathode of said second LED-lamp bunch connects to the anode of said first LED-lamp group; the cathode of said first LED-lamp group connects to the anode of said second LED-lamp group; said logic controller connects to the cathode of said first LED-lamp group, through said first N-type driving module; the cathode of said second LED-lamp group connects to the anode of said third LED-lamp group; said logic controller connects to the cathode of said second LED-lamp group, through said second N-type driving module; the cathode of said third LED-lamp group connects to the anode of said fourth LED-lamp group; said logic controller connects to the cathode of said third LED-lamp group, through said third N-type driving module; said logic controller connects to the cathode of said fourth LED-lamp group, through said fourth N-type driving module.