An isolated dimming circuit built by op amp

Abstract

The invention proposes a secondary side control isolation dimming circuit built by an operational amplifier, including a power input terminal, a high-power control circuit, and a power output terminal connected in sequence, and a dimming circuit is connected between the high-power control circuit and the power output terminal. The signal conversion circuit and the secondary control circuit, the dimming signal conversion circuit and the secondary control circuit perform signal transmission through the first optocoupler, and the high power control circuit and the secondary control circuit perform signal transmission through the second optocoupler. The invention realizes the dimming function of isolation of input and output, isolation of dimming signal and output.

Description

technical field [0001] The invention relates to the technical field of dimming circuits, in particular to an isolated dimming circuit constructed by operational amplifiers. Background technique [0002] With the gradual decline of traditional thyristor dimming, more stable and reliable 0-10V dimming technology has begun to emerge. The corresponding laws and regulations have been gradually improved, and the safety regulations and standards have begun to require that the 0-10V dimmer needs to be safely isolated from the primary high voltage, and needs to be isolated from the power output SELV. [0003] At the same time, most of the 0-10V dimming solutions launched by major chip manufacturers focus on low-power flyback topology, or a single general-purpose chip for dimming signal reception. For complex high-power circuits such as LLC and LCC, no chip manufacturer has yet launched a complete set of 0-10V control solutions. There are also power supply manufacturers who directly...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that high-power lines cannot simultaneously satisfy 0-10V dimming and dimming port safety isolation, the present invention proposes a secondary side control isolation dimming line built by op amps, through optocoupler isolation, double op amp secondary side Control, only need to use traditional optocoupler isolation, secondary side control chip can realize 0-10V dimming function

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