Abstract: A voltage-adaptive laser driving circuit and a control method thereof. The circuit includes: a switching power supply, a laser, a constant current driving circuit, a current setting circuit, an MCU control circuit, a voltage acquisition circuit and a voltage setting circuit; the switching power supply is connected to the laser and the voltage setting circuit respectively and used for providing electrical energy for the laser and the voltage setting circuit; and the laser is connected to the switching power supply and the constant current driving circuit respectively and used for generating laser light.

Abstract: A stroboscopic stepped illumination defect detection system for appearance defect detection of a product is provided. The system includes an image extraction unit, a brightness adjustment unit, a data processing unit, and a stroboscopic control unit. The image extraction unit is connected to the stroboscopic control unit and used for obtaining stable and clear images in various transmission/reflection visual bright fields/dark fields; and the brightness adjustment unit is connected to the stroboscopic control unit and used for setting various transmission/reflection visual bright fields/dark fields and converting in the various transmission/reflection visual bright fields/dark fields.