Isolation dimming circuit built by operational amplifier

Abstract

The invention discloses a secondary side control isolation dimming circuit built by an operational amplifier. The secondary side control isolation dimming circuit comprises a power input end, a high-power control circuit and a power output end which are sequentially connected, wherein a dimming signal conversion circuit and a secondary side control circuit are connected between the high-power control circuit and the power output end; the dimming signal conversion circuit and the secondary side control circuit perform signal transmission through a first optical coupler; and the high-power control circuit and the secondary side control circuit perform signal transmission through a second optical coupler. The secondary side control isolation dimming circuit realizes the dimming function of input and output isolation and dimming signal and output isolation.

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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