LED LINEAR CONSTANT CURRENT DRIVING CIRCUIT WITHIN ADAPTIVE WIDE VOLTAGE RANGE

摘要

Disclosed is an LED linear constant current driving circuit within an adaptive wide voltage range. The LED linear constant current driving circuit comprises: a rectification bridge (1) that performs full-wave rectification on a sinusoidal voltage waveform, and is connected with a filter circuit (2) and a high voltage stabilization and reduction circuit (5) by means of a wire; the filter circuit (2) that is used for performing filtering to convert a full-wave pulsating voltage outputted from the rectification bridge into a direct current voltage, and is connected with a constant current source circuit (3) by means of the wire; the constant current source circuit (3) that is used for limiting current flowing through a load LED and providing a constant current power supply for an LED lamp, and is connected with a switching array circuit (4) by means of the wire; the switching array circuit (4) that performs switching between the series and parallel connection modes of LED lamp strings according to the switching characteristic of an LDMOS tube when an external voltage is changed; and the high voltage stabilization and reduction circuit (5) that provides a working voltage for a low voltage module. The present invention solves the technical problem in the prior art of waste caused due to insufficient utilization of LED.