LED constant current driving device

Abstract

The invention relates to an LED constant current driving device which comprises a rectifying module, a control module, a constant current module and a lighting module, wherein the output end of the rectifying module is respectively connected with the control module and the lighting module; the constant current module is arranged between the control module and the lighting module; the lighting module comprises N LED units which are connected in series in sequence; the constant current module comprises a current limiting circuit, a sampling circuit and a compensating circuit; in the monotone increasing or monotone decreasing process of the output voltage of the rectifying module, the N LED units which are connected in series in sequence are conducted one by one or quenched one by one; when at least one LED unit is conducted, the control module outputs a control voltage according to the voltage generated by the compensating circuit and the sampling circuit together to control the current limiting circuit to decrease or increase the current conducted onto the LED unit, so as to enable the power of the conducted LED unit to keep stable.

Description

technical field [0001] The invention relates to an LED driving device, in particular to an LED constant current driving device. Background technique [0002] Now the country advocates energy saving and emission reduction, and lighting products using LED light sources in the lighting field are developing rapidly due to their excellent energy saving, low carbon and green environmental protection effects. When the LED is used as the light source of the lighting device, the life of the lighting device not only depends on the LED, but also depends on components such as the driving power supply. In the current application scheme, the bottleneck of the life of the LED lighting device is still the driving power supply. In order to reduce the impact of the life of the driving power supply on the life of LED lamps, the researchers improved the existing DC power drive device on the one hand, and designed a new circuit for directly driving LEDs with AC power on the other hand. [0003...

AI Technical Summary

Problems solved by technology

[0003] For ordinary people, the use of LED lighting products can save electricity, but the problem with existing LED lighting products is that the driving life is short

Although the LED drive circuit of this scheme has a high power factor and utilization rate, most of this LED drive circuit uses multiple constant current sources

And this kind of driving circuit has the following major defects: when the voltage is in the normal fluctuation range, the output power of the circuit will change greatly, resulting in unstable power and flickering of the LED

The LED drive circuit of this technical solution has a higher power factor, but it does not solve the problem of LED flickering when the voltage fluctuates

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