Excitation circuit for DC sensors

摘要

A circuit for exciting at least one DC sensor is provided in which the circuit has a digital regulation controller connected to a main system and to a regulation loop. The main system has a DAC connected to the sensor via a non-inverted amplified path and via an inverted amplified path in order to send sensor excitation signals including a DC component in differential mode. The regulation system includes an ADC connected to the amplified paths. The circuit includes a monitoring system that is connected to the controller in parallel with the converter in order to send signals as a function of an AC component of the signals taken from the amplified paths. The digital controller is arranged to inject a sinewave in common mode into the excitation signals and to analyze signals output by the monitoring system and signals output by the ADC.

主权项

1. A circuit for exciting at least one direct current (DC) sensor, the circuit comprising:
a digital regulation controller connected to a main system and to a regulation loop; wherein the main system comprises a digital-to-analog converter (DAC) connected to the sensor via a non-inverted amplified path and via an inverted amplified path in order to send sensor excitation signals including a DC component in differential mode; wherein the regulation loop includes an analog-to-digital converter (ADC) connected to the amplified paths; a monitoring system that is connected to the digital regulation controller in parallel with the analog-to-digital (ADC) converter in order to send signals as a function of an alternating current (AC) component of the signals taken from the amplified paths; and wherein the digital regulation controller is arranged to inject a sinewave in common mode into the excitation signals and to analyze signals output by the monitoring system and signals output by the ADC.