The utility model discloses a multichannel negative feedback speed stepless DC fan control circuit is characterized by comprising a comparator, the output end is connected with the switch of the base, the switch of the collector is connected with the DC fan, and a collector through a capacitor feedback to the comparator V+ terminal of the comparator; the power supply terminal and switch emitter connected 12V power, the V- comparator ports are connected in series regulator circuit into digital signal through rheostat and diode, the adjusting circuit is connected in parallel with a multi group. The circuit of the utility model can achieve the purpose of controlling the speed of the direct current fan by adjusting the rheostat to realize stepless speed regulation and multiplex control, thereby improving the stability of the speed regulation and the convenience of the application.
【技术实现步骤摘要】
【技术保护点】
1.多路无级负反馈直流风机转速控制电路,其特征是:含有一个比较器(1),比较器的输出端(11)连接开关管(Q1)的基极,开关管的集电极连接直流风机(2),并且集电极上还通过一个积分电容(C1)反馈至比较器的V+端(13);所述比较器电源端(14)和开关管射极连接12V电源,比较器的V-端(12)通过变阻器(RX1、RX2)和二极管串联构成的调节电路引入数字信号,所述调节电路并联有多组。
【技术特征摘要】
【专利技术属性】
技术研发人员:吴红苗,
申请(专利权)人:无锡和晶科技股份有限公司,
类型:实用新型
国别省市:32
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