测量扬声器阻抗曲线的功率放大器设计

Design of power amplifier for measuring speaker impedance curve

分析了2种应用于测量扬声器阻抗曲线的功率放大器.这2种类型的功放能够分别实现对扬声器阻抗曲线使用恒流法和恒压法进行测量.使用恒流功放,可以避免传统方法中串联电阻取值过大的缺点;使用恒压功放,可以消除分压电阻降低扬声器工作电压的不足.实验测试表明,这2种功放具有较好的性能,达到了设计目标.

Two types of power amplifier for measuring speaker impedance curve were analysed. Constant current and constant voltage methods can be used to measure the speaker impedance curve respectively with these two types of amplifiers. The fault that the series resistor has high value can be avoided by using the constant current amplifier, and the fault that the dividing resistor reduces the working voltage of the speaker can be avoided by using the constant voltage amplifier. Test results show that these two tvoes of power amplifiers have better performance and achieve the design aims.