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来源：百度知道 编辑：UC知道 时间：2024/05/24 07:55:42
无线电源控制系统由无线发射电路和无线接收电路组成，该设计部分为接收电路部分。接收电路主要由TDQ-3型的高频调谐和由TA7680组成的中频放大、同步检波电路组成。TDQ-3型高频调谐器接收频率范围为47MHz～870MHz。本系统所要求接收的315MHz和433.92MHz都在这个范围内。高频调谐器也称高频头，它的功能是从天线送来的信号中调谐选择出欲接收的信号，进行调谐放大后使它与本振电路产生的载波相混频。高频调谐器是利用电压实现波段切换和频道调谐的。TA7680中频系统的功能包括：中放、检波、中放自动增益控制AGC、高放和自动频率微调AFT等。解码电路由TA7680解调出的数字信号，经LM741和LM393整形，送给单片机AT89C2051进行解码。解码后经单片机AT89C2051通过SSR固态继电器控制电源的开关。
The wireless power source control system is composed by the wireless transmission circuit and the wireless accepting circuit, this design part for accepting circuit part.The accepting circuit mainly by TDQ-3 high frequency harmonious and the supersonic amplification, the synchronization detecting circuit which is composed by TA7680 is composed.The TDQ-3 high frequency tuner receive frequency range is 47MHz~870MHz.This system requests the receive 315MHz and 433.92MHz all in this scope.The high frequency tuner also calls the high frequency tuner, the signal which from the antenna its function is which sends in the signal harmonious chooses wants to receive, after carries on the harmonious enlargement to cause it the carrier phase mixing which produces with the local oscillation electric circuit.The high frequency tuner is uses the voltage realization wave band cut and the channel harmonious.The TA7680 I-F system function includes: Puts, the detection, puts automatic gain control AGC,