A led control drive circuit

Abstract

The invention discloses a novel LED control driving circuit, which relates to the technical field of LED driving, and mainly includes a power supply module, an LED lighting circuit and an LED dimming circuit. The LED dimming circuit includes a module for generating an internal reference voltage, a sampling module, an average value calculation module module, a transconductance amplifier, a comparator, a voltage conversion time module, a MOFET tube for controlling the on-off of the LED lighting circuit, and a MOFET tube driving module, the positive terminal of the comparator is connected to the voltage VP, and the output terminal is connected to the voltage conversion time module and the MOFET tube. Driving module; the positive terminal of the transconductance amplifier is connected to the voltage VJ, the negative terminal is connected to the voltage VA, and the voltage conversion time module converts the voltage VG into a pulse signal corresponding to the pulse width; the MOFET tube driving module converts the pulse signal into a current signal. Used to drive MOSFET tubes. The system can enter the CCM mode, which can reduce the LED output voltage ripple, and the filter capacitor can be omitted at both ends of the LED, and the life of the LED lamp will be well guaranteed, which simplifies the peripheral circuit and reduces the cost.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to a novel LED control driving circuit. Background technique [0002] At present, LED driving technology is becoming more and more mature, and the requirements for cost are also getting higher and higher. Most of the LED drive circuits on the market use BCM and DCM modes. Such a structure has large ripples for LED lights, and filter capacitors need to be connected at both ends of the LED. Especially for non-isolated systems, due to the relatively high output voltage, it is necessary to The capacitor withstand voltage is relatively high, and the cost is relatively high. Contents of the invention [0003] The technical problem to be solved by the present invention is to solve the above-mentioned deficiencies in the prior art, and provide a control driving circuit that can reduce LED ripples and does not need to connect filter capacitors to the ends of the LEDs. [0004] In ord...

AI Technical Summary

Problems solved by technology

Most of the LED drive circuits on the market use BCM and DCM modes. Such a structure has large ripples for LED lights, and filter capacitors need to be connected at both ends of the LED. Especially for non-isolated systems, due to the relatively high output voltage, it is necessary to The capacitance withstand voltage is relatively high, and the cost is relatively high

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