ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,389,509, issued on Aug. 12.
"Overcurrent and overload protection circuit for LED light string" was invented by Huawang Liu (HeShan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An overcurrent and overload protection circuit of an LED light string includes an LED light string control circuit 20 connecting to a protection circuit 10 and a wireless receiving circuit 30 respectively. The protection circuit 10 includes a first, a second, and a fourth switch transistors Q1, Q2, and Q4 connected in parallel to an input terminal of a power supply, and a third switch transistor Q3 connected in parallel with the first and the fourth switch transistor Q1, ...