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发明公开
CN101719761A 精密频率跟踪电路 失效 - 权利终止 转让 质押

精密频率跟踪电路
摘要：
本发明涉及一种精密频率跟踪电路，该电路由稳压电路、分压滤波限幅电路、高输入电阻的差分比例运算电路、比较电路和光耦隔离电路连接构成；稳压电路包括电容C3、C4、电阻R21、稳压管Z1；分压滤波限幅电路包括电阻R1、R2、R7、R8、R9、R10、电容C1、C2、电解电容E1、二极管D1、D2；其中分压电路包括R1、R2、R7、R8、R9、R10，滤波限幅电路包括电容C1、二极管D1、D2，另一路滤波电路包括电容C2、电解电容E1；高输入电阻的差分比例运算电路包括电阻R3、R4、R5、R6、R11、R12、R13、R14、R15、R16、运算放大器U1B、U1C、U1D；比较电路包括电阻R17、R18、R19、运算放大器U1A；光耦隔离电路包括电阻R20、光电耦合器U2。其跟踪频率范围宽，抗干扰能力强，成本较低。
摘要（英）：

The invention relates to a precise frequency tracking circuit. The circuit is formed by connecting a voltage-stabilizing circuit, voltage-dividing, filtering and amplitude limiting circuits, a high input resistance difference ratio operational circuit, a comparison circuit and an optical coupling isolating circuit; the voltage-stabilizing circuit comprises capacitors C3 and C4, a resistor R21, and a voltage-stabilizing tube Z1; the voltage-dividing, filtering and amplitude limiting circuits comprise resistors R1, R2, R7, R8, R9 and R10, capacitors C1 and C2, an electrolytic capacitor E1, and diodes D1 and D2; the voltage-dividing circuit comprises R1, R2, R7, R8, R9 and R10, the filtering and amplitude limiting circuits comprise C1, D1 and D2, and the other filtering circuit comprises C2 and E1; the high input resistance difference ratio operational circuit comprises resistors R3, R4, R5, R6, R11, R12, R13, R14, R15, R16, and operational amplifiers UIB, UIC and UID; the comparison circuit comprises resistors R17, R18 and R19, and operational amplifiers UIA; and the optical coupling isolating circuit comprises a resistor R20 and a photocoupler U2. The precise frequency tracking circuit has broad tracking frequency range, strong anti-interference capacity and lower cost.

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