Inverter brightness control circuit diagram

Photocoupler

$/> The above figure shows the brightness control circuit of the inverter. It is mainly composed of operational amplifier IC3, diode D9, capacitor C30 and resistors R23, R22, R33, R34, R32 and so on. The main control circuit partially accumulates the brightness adjustment signal by PWM pulse to the â—Ž pin (non-inverting input terminal) of IC3, and its output terminal is short-circuited with the inverting input terminal to form an amplifier with a voltage gain of 1. After the brightness adjustment level is amplified, after D9 rectification, R23, C30 filtering, it is sent to IC2 through R22 and R34, and sent to the @I pin of IC2 via R33 and R32. Adjusting the width of the PWM pulse signal, after being driven to the high voltage circuit through the driving circuit, finally changing the high voltage amplitude, which also changes the brightness of the backlight, and achieves the purpose of brightness adjustment. </p> </div> </div> <div class="tech-detail-share">  <div class="bdsharebuttonbox"> <a href="#" class ="bds_qzone" data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Wei Bo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</span> </ Div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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