Novel LED constant-current drive circuit

Abstract

The invention discloses a novel LED constant-current drive circuit. The novel LED constant-current drive circuit comprises an alternating current input end, a rectifier module, a filtering module with the power factor correction function, a current amplifying module and an output module, wherein the alternating current input end, the rectifier module, the filtering module, the current amplifying module and the output module are connected with one another in sequence. The current amplifying module comprises a current-limiting resistor and two triodes, wherein the current-limiting resistor and the two diodes are sequentially connected between the two electrodes of the current amplifying module. A constant-current control module is further arranged on the drive circuit. The constant-current control module comprises a field-effect tube. A source electrode of the field-effect tube is connected with base electrodes of the two triodes. A control grid electrode of the field-effect tube is connected between the current-limiting resistor and the two triodes. The LED constant-current drive circuit has the function of automatically conducting feedback and control according to changes of an output current, the output current can be automatically adjusted through feedback and control, a current which is outputted to flow through an LED can be constant, the constant-current effect is good, the long service life of an LED lamp can be ensured, and the LED constant-current drive circuit is economical and good in use effect.

Description

technical field [0001] The invention relates to an LED constant current drive circuit, in particular to a novel LED constant current drive circuit for an LED lighting lamp. Background technique [0002] Existing LED constant current drive circuits mainly include four types: constant current drive circuits using ICs, RCC drive circuits, constant current diode drive circuits and resistance-capacitance step-down drive circuits. Among them, the constant current effect of the IC constant current drive circuit is good, but the cost of the IC is high; the current RCC drive circuit is simple and low in cost, but the constant current effect for high-power LED lamps is poor, and it can only be used for low-power LED lamps. LED lamp drive; constant current diode driver has better constant current effect, but the constant current operating voltage range is narrow, and can only be used in a few places with small voltage fluctuations, and the scope of use is limited; RC step-down driver h...

AI Technical Summary

Problems solved by technology

Among them, the constant current effect of the IC constant current drive circuit is good, but the cost of the IC is high; the current RCC drive circuit is simple and low in cost, but the constant current effect for high-power LED lamps is poor, and it can only be used for low-power LED lamps. LED lamp drive; constant current diode driver has better constant current effect, but the constant current operating voltage range is narrow, and can only be used in a few places with small voltage fluctuations, and the scope of use is limited; RC step-down driver has poor constant current effect and belongs to range to be eliminated

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