And power amplification circuit is used for force transducer

The utility model relates to a power amplification circuit for a force transducer. A transformer connected in series with the load sensor samples the input voltage waveform of the sensor; a resistancesampling sensor connected in series with the load sensor inputs current; sampled sensor input voltage waveforms and sensor input current signals are fed back to the 330Hz sine waves and are input tothe input end of the operational amplifier after being superposed with the input 330Hz sine waves, and sensor exciting currents are output after output signals of the operational amplifier are amplified by the power triode circuit. And two paths of sampling feedback form current and voltage waveform feedback closed-loop control, so that the stability of the formed sensor excitation large current is ensured. The circuit not only can output constant current, but also can ensure that the voltage waveform is not distorted, thereby ensuring the test accuracy of the magnetoelastic sensor. 本实用新型涉及一种用于测力传感器的功率放大电路，与负载传感器串联的变压器