Synchronous rectification driving method and apparatus, and device and direct-current converter

A synchronous rectification driving method for a synchronous rectification circuit in a direct-current converter, wherein the synchronous rectification circuit comprises at least two switching units, and each of the switching units comprises M synchronous rectification transistors connected in parallel, where M is a positive integer greater than or equal to 2, the method comprises:

• obtaining detection data representing a total current flowing through the synchronous rectification transistors in any of the switching units when all driving signals inputted to the synchronous rectification transistors in the synchronous rectification circuit operate normally;
• and
• comparing the detection data with a preset threshold, and controlling, for each of the switching units, the driving signals inputted to N synchronous rectification transistors in the switching unit to be continuously turned off when the detection data is less than or equal to the preset threshold, where N is a positive integer less than or equal to M.

A synchronous rectification driving apparatus for a synchronous rectification circuit in a direct-current converter, wherein the synchronous rectification circuit comprises at least two switching units, each of the switching units comprises M synchronous rectification transistors connected in parallel, where M is a positive integer greater than or equal to 2, the apparatus comprises:

• an acquisition module, configured to obtain detection data representing a total current flowing through the synchronous rectification transistors in any of the switching units when all driving signals inputted to the synchronous rectification transistors in the synchronous rectification circuit operate normally;
• and
• a control module, configured to compare the detection data with a preset threshold, and control, for each of the switching units, the driving signals inputted to N synchronous rectification transistors in the switching unit to be continuously turned off when the detection data is less than or equal to the preset threshold, where N is a positive integer less than or equal to M.