Insulation type general use illumination LED driving circuit

Abstract

The invention belongs to the electronic technical field and relates to a versatile lighting LED driving circuit. The invention comprises an input rectifier circuit, a power factor correction (PFC) control circuit, a transformer surge current and peak voltage absorption circuit, an optical coupler isolation feedback circuit, an isolated switching transformer and an unidirectional rectifier output circuit. The invention takes a power management chip NCP1653 of the OnSemi Company as a control core, primary current of the switching transformer is checked to realize the power factor correction function, a circuit topological structure is a flyback isolated type, the working mode is a continuous conduction mode, the circuit topological structure has the functions of power factor correction, light modulation, constant current constant voltage output and absorbing the surge current of switch element guide circuit instant and the peak voltage of cutting instant, simultaneously, since the invention adopts the power management chip NCP1653, a large amount of peripheral circuit can be saved, and thereby the invention is has the advantages of low cost and small volume and is suitable for batchproduction.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a general lighting LED (light emitting diode) driving circuit, in particular to an isolated high-reliability lighting LED driving circuit. Background technique [0002] LED lighting technology has the advantages of energy saving, environmental protection, long life and easy control. It is one of the most promising high-tech fields in the 21st century. It will replace incandescent lamps and fluorescent lamps and become the leading lighting market. Under such a bright prospect of the LED lighting industry, various LED lamp driving circuits are also developing rapidly for different applications in the lighting field, and most of them adopt switching power supply technology. However, many LED drive circuits currently use non-isolated drive structures or isolated drive structures without power factor correction (PFC) functions. Non-isolated LED drive circuits have poor reliability, ...

AI Technical Summary

Problems solved by technology

However, many LED drive circuits currently use non-isolated drive structures or isolated drive structures without power factor correction (PFC) functions. Non-isolated LED drive circuits have poor reliability, and LED drive circuits without PFC functions have low power utilization.

In addition, for the isolated circuit structure, due to the existence of the isolation transformer, a large inrush current will be generated when the switching element is turned on, and a large peak voltage will be generated at the moment of turning off, which will affect the power supply efficiency and the life of the switch tube.

The absorption circuit of the existing isolated switching power supply at the moment when the switching element is turned off is relatively mature, but there are few absorption circuits when the switching element is turned on. Instantaneous inrush current becomes a technical problem

Images