LED LAMP AND PROTECTING CIRCUIT THEREOF

摘要

A protecting circuit for an LED unit includes first, second, third and fourth diodes. A cathode of the second diode couples to an anode of the first diode, and a cathode of the third diode couples to a cathode of the first diode. The fourth diode includes an anode coupling to the anode of the second diode and a cathode coupling to the anode of the third diode. A first junction is formed between the first and second diodes, a second junction is formed between the third and fourth diodes, a third junction is formed between the second and fourth diodes, and a fourth junction is formed between the first and the third diodes. The first and the second junctions are connected to the LED unit. The third and fourth junctions are connected to a power source for supplying electric current to the LED unit.