LED drive device and its drive control circuit

Abstract

The present application discloses an LED drive control circuit, comprising: a control terminal, receiving a DC input voltage; a current sampling terminal, receiving a current sampling signal; an input detection module, used for acquiring a first voltage signal representing the DC input voltage, and according to the A voltage signal and a reference voltage generate a control signal representing the input state; the drive control module is connected to the input detection module, receives the control signal, and is used to generate the drive signal according to the control signal; the first end and the second end of the power switch tube are respectively It is connected with the control end and the current sampling end, and the control end is connected with the output end of the drive control module, and receives the drive signal, and the drive signal is used to control the turn-on and turn-off of the power switch tube. The application also discloses an LED driving device, which multiplexes the existing pins of the LED driving control circuit to detect the input state, reduces the voltage divider resistance for peripheral detection of the DC input voltage, and reduces the pins for separately detecting the DC input voltage.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an LED driving device and a driving control circuit thereof. Background technique [0002] With the wide application of LED drive circuits, there are currently LED lights in shopping malls, offices, and furniture. In many application scenarios, it is necessary to increase the detection function of the LED drive circuit for the DC input voltage in order to be more reasonably applied. For example, the current segmented dimming light bulb, that is, every time the wall switch is turned on and off, the brightness of the light bulb will change next time until the user is satisfied. [0003] There are also some UPS lighting power supplies, which also need to detect the DC input voltage for the next step. [0004] At present, the input detection circuit of the LED driving circuit detects the DC input voltage through a resistor divider, which usually requires adding a pin of t...

AI Technical Summary

Problems solved by technology

[0004] At present, the input detection circuit of the LED drive circuit detects the DC input voltage through resistor voltage division, which usually requires adding a pin of the drive control circuit. However, adding pins is not conducive to integration, and it will also increase the peripheral components of the drive control circuit.

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