A kind of led drive control circuit, control device and control method

Abstract

The invention discloses an LED driving control circuit, a control device and a control method. The control circuit includes: a conduction angle detection circuit, a constant current reference circuit, a CS peak detection circuit, a CS peak hold circuit, a zero-crossing detection circuit and a control circuit. circuit, the conduction angle detection circuit judges the on-off state of the thyristor by detecting the rectified input voltage, and outputs the on-off state signal of the thyristor, and the control circuit realizes the power factor according to the on-off state signal of the thyristor Calibration, positive constant current output, and the minimum maintenance current control of the thyristor to switch between two control modes. The invention removes the pure false load, reduces energy consumption, is highly intelligent, has high working efficiency, can adapt to different thyristors, has strong compatibility, and the input current is always greater than the minimum holding current of the thyristor, and no The phenomenon of flashing lights can adapt to different high and low voltage inputs, the circuit design is ingenious, and the practicability is strong.

Description

technical field [0001] The present invention relates to the technical field of LED lighting drive power electronics, and in particular to an LED power supply control circuit, a control device using the drive control circuit, and a control method based on the control device. Background technique [0002] The current silicon controlled rectifier LED dimming circuit, because of the device of the silicon controlled rectifier itself, requires the existence of a sustaining current to be continuously turned on. Therefore, for dimming LED power supply requirements, when outputting low power or dimming to low power, especially when high voltage (200-240VAC) is input for low power output or dimming to small conduction angle, the input current should be less than possible The thyristor maintains the current, and the thyristor will enter the off state. At this time, the circuit will interrupt the power input due to the shutdown of the thyristor, and flashing and restarting will occur. ...

AI Technical Summary

Problems solved by technology

However, the core of these solutions is to meet the maintenance current by adding an additional dummy load, which brings about a lot of power loss and low efficiency; different thyristors need to adjust different dummy load cut-in points, and the compatibility is poor; It cannot be compatible with high and low voltage input at the same time, and it needs to be debugged separately, so the adaptability is poor

These do not meet the needs of the present and future energy-saving development and intelligent control

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