Synchronization method for LED power supply through single wires

The invention provides a synchronization method for an LED power supply through single wires. The synchronization method is characterized in that synchronous communication among synchronous communication ports of the LED power supply is realized by adopting the single wires; the reference level of the synchronous communication signal is a bridge type rectifying output negative end; the signal end of the synchronous communication signal is an alternating phase line or a bridge type rectifying output positive end; a main-control LED power supply carries out signal modulation on a to-be-synchronized signal and the signal end signal of the synchronous communication signal based on the reference level of the synchronous communication signal of the main control LED power supply, and the modulated signal is taken as the synchronous signal and is output through the corresponding synchronous communication port; and a to-be-synchronized LED power supply demodulates the synchronous signal by analyzing the synchronous signal of the synchronous signal port and the reference level of the to-be-synchronized LED power supply. Dimming luminance signals and switching signals are transmitted by adapting the single wires; high-voltage signals which are the same as the power line are adopted for transmission, so that isolation processing is not required, and the power line for transmitting signals is not limited; and meanwhile, any one phase line of the three-phase power supply can be used for transmitting signals without limiting distances and the numbers of power supplies.