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...

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