System synchronization method

A system synchronization method, comprising:

• connecting synchronization modules of a plurality of devices together through a synchronization bus, wherein
• the synchronization modules comprise a signal generation module, a switch control module, a synchronization bus monitoring module, and a switch S1;
• a signal output terminal of the signal generation module is connected to a first terminal of the switch S1, and a timing overflow terminal of the signal generation module is connected to the switch control module configured to control the switch S1;
• the switch control module is connected to the synchronization bus monitoring module;
• and
• a second terminal of the switch S1 is connected to the switch control module and the synchronization bus monitoring module;
• wherein the synchronization modules comprise:
• the signal generation module, wherein an input of the signal generation module is connected to a power supply Power, an output signal PWMi of the signal generation module is connected to an input of the switch S1, and a timing overflow signal OV_i of the signal generation module is connected to an enable terminal En of the switch control module;
• the switch S1, wherein the input of the switch S1 is connected to PWMi, an output of the switch S1 is connected to the synchronization bus, and the switch S1 is controlled by an output signal Ctli of the switch control module to allow PWMi to be connected to or disconnected from the synchronization bus;
• the switch control module, wherein the enable terminal En of the switch control module is connected to OV_i of the signal generation module, a lock terminal Lock of the switch control module is connected to the synchronization bus, a reset terminal Rst of the switch control module is connected to an output Reset of the synchronization bus monitoring module, and the output signal Ctli of the switch control module is connected to the switch S1;
• and
• the synchronization bus monitoring module, wherein an input of the synchronization bus monitoring module is connected to the synchronization bus, the output Reset of the synchronization bus monitoring module is connected to the reset terminal Rst of the switch control module, and the synchronization bus monitoring module is configured to monitor whether a signal loss time of the synchronization bus exceeds a preset time.