| 摘要 |
<p>A circuit with an LED (light-emitting diode) dimming linear compensation comprises a rectification circuit (10), a filtering circuit (20), an RCC drive circuit (30) and a compensation resistor R1, wherein the rectification circuit (10) is provided with two input ends connected with an alternating current and two direct-current output ends; the input end of the filter circuit (20) is connected with the direct-current output ends, and the filter circuit is provided with two output ends for outputting a positive electrode and a negative electrode; the RCC drive circuit (30) comprises an oscillation circuit used for driving an LED light source in an RCC mode; the compensation resistor R1 is serially connected in front of one input end of the rectification circuit (10). The rectification resistor R1 is located in front of the rectification circuit (10), thus the voltage of the rear-stage RCC drive circuit (30) is reduced when a trunk circuit current is increased; moreover, the volt-ampere characteristics of the circuit are improved by virtue of the characteristic of being approximate to an impedance load of the RCC drive circuit (30), thus the circuit is more adaptive to the work of a silicon-controlled dimmer.</p> |
