Two-bus starting method and starting circuit

The invention discloses a two-bus starting method and starting circuit, and relates to the technical field of two-buses, the control end of the two-bus is used for receiving a starting signal, the output end of the two-bus is used for providing a power supply communication signal for a load, and the starting signal is in direct proportion to the power supply communication signal. The starting method comprises the following steps: controlling a starting signal to output a first continuous pulse signal of a first voltage value, wherein the first continuous pulse signal sequentially widens the pulse width from an initial end pulse of a first pulse width; and when the tail end pulse of the first continuous pulse signal reaches a second pulse width, controlling the starting signal to be converted into a continuous high-level signal of the first voltage value. According to the method and the device, the two-way bus is slowly started in a mode of sequentially broadening the pulse width of the starting signal from th