LED (light-emitting diode) linear constant current drive controller with wide input voltage range

Abstract

The invention belongs to the field of LED (light-emitting diode) driving circuit design, and provides an LED linear constant current drive controller, with a wide input voltage range, and an LED driving device. The controller samples voltage output by a rectifying and filtering circuit through a voltage sampling circuit; if the voltage value is too high or too low, the voltage is regulated through a voltage regulation circuit, and then is output to an light-emitting diode unit which is served as load, so that normal breakover of the light-emitting diode unit is guaranteed, wide-range control to the voltage input to the rectifying and filtering circuit is also realized, and the controller is safe and reliable. Compared with a constant current drive controlling circuit of the existing flyback or DC-DC (direct current to direct current) buck-boost switching power supply, the LED linear constant current drive controller has the advantages that as a linear driving mode is adopted, an input circuit and an output circuit belong to an identical circuit, and the structure is simpler; and compared with the existing linear LED linear constant current driving control circuit, the LED linear constant current drive controller has the advantages that wide-range control to input voltage is realized, the applicability is higher, and circuits can not be burnt when the input voltage is too high.

Description

technical field [0001] The invention belongs to the field of LED drive circuit design, in particular to an LED linear constant current drive controller and an LED drive device with a wide input voltage range. Background technique [0002] Currently, there are two implementations of LED drive devices: [0003] One is a flyback or DC-DC buck-boost switching power supply type constant current drive control circuit. Because there are energy storage elements such as transformers or inductors in this circuit topology, the input part and output part of the circuit are separate current loops, and the output voltage (that is, the sum of the voltages of the LED units as the load) is not limited by the input voltage , so the input voltage can be varied in a wide range. However, this kind of constant current drive control circuit has a complex structure, occupies a large circuit board, and has high cost, which is not conducive to production and promotion. [0004] The other is a line...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a LED linear constant current drive controller with a wide input voltage range, aiming to solve the problem that the amplitude of the input voltage must not be lower than that of the load in the existing linear LED constant current drive control circuit. The voltage at both ends of the LED unit must not be too high in order to avoid circuit burnout, and it is impossible to achieve a wide range of changes

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