Patent ID: 8193731

Claim:
An LED lamp driven by alternating current comprising: at least a first constant-current supplying device, a terminal of which is connected to a first connecting terminal of an AC power source, wherein the first constant-current supplying device comprises: a first constant-current supplying circuit allowing the current in a first half cycle of the AC power source to pass through; and a first protecting circuit connected in parallel with the first constant-current supplying circuit, and allowing the current in a second half cycle of the AC power source to pass through; at least a second constant-current supplying device, a terminal of which is connected to a second connecting terminal of the AC power source, wherein the second constant-current supplying device comprises: a second constant-current supplying circuit allowing the current in the second half cycle of the AC power source to pass through; and a second protecting circuit connected in parallel with the second constant-current supplying circuit, and allowing the current in the first half cycle of the AC power source to pass through; and at least a first LED load, connected between the first constant-current supplying device and the second constant-current supplying device.