Switching power supply driving circuit

Abstract

The invention relates to a switching power supply driving circuit. The circuit comprises a control circuit and a driving circuit which is connected with the control circuit and used for controlling apower switch tube switch. The control circuit is provided with a first control end and a second control end; the control circuit comprises a logic delay circuit and a clamping control circuit connected with the logic delay circuit. The clamping control circuit is connected with the driving circuit through the first control end, the logic delay circuit is connected with the driving circuit throughthe second control end, the first control end outputs a first control signal and controls the driving circuit to turn on a power switch tube, and the drain voltage of the power switch tube is reduced;and the second control end outputs a second control signal and controls the driving circuit to close the power switch tube, and the drain voltage of the power switch tube is increased. The switchingpower supply driving circuit is simple in structure and convenient to operate.

Description

technical field [0001] The invention relates to a switching power supply drive circuit, which belongs to the technical field of electronic circuits. Background technique [0002] With the development of science and technology, power electronics technology is also constantly developing and innovating. Switching power supplies based on power electronics technology have been widely used in various electronic equipment and electrical equipment, such as communication equipment, military equipment, industrial equipment, household appliances and Digital products, etc. However, as the closest part to the power grid, its EMC (electromagnetic compatibility) characteristics have become very important. On the one hand, the switching power supply needs to have good adaptability to external electromagnetic interference, and on the other hand, it must be able to reduce the interference to the power grid and surrounding electronic equipment. [0003] The phenomenon that electronic product...

AI Technical Summary

Problems solved by technology

[0003] The phenomenon that electronic products interfere with peripheral electronic equipment is EMI (electromagnetic interference). Electromagnetic interference has many hazards, first of all, it will affect the performance of electronic equipment; Other electronic devices on the network may interfere; severe electromagnetic interference may cause high-voltage breakdown or burnout of electronic devices

[0004] The faster the switching speed of the switching power supply, the smaller the switching loss and the higher the power conversion efficiency, but this is also the main cause of electromagnetic interference

Images