Sampling circuit compatible with unipolar and bipolar analog signals

Abstract

The invention belongs to the technical field of signal collection and conditioning in power conversion and control systems of power systems, and relates to a sampling circuit compatible with unipolar and bipolar analog signals. The circuit comprises a signal collection circuit, an analog signal conditioning circuit, an external expansion AD unit, an external expansion FPGA unit and a DSP master control unit. A sensor transmits a collected signal to the analog signal conditioning circuit, the signal processed by the analog signal conditioning circuit is transmitted to an off-chip AD or an on-chip AD of a DSP, the off-chip AD is connected with a sampling pin distributed to the external expansion FPGA unit, and the external expansion FPGA unit is connected with the DSP master control unit in a bus mode, so that off-chip sampling data are read. The sampling circuit has the advantages that the circuit supports multi-channel input and is simple in structure and high in functionality; the sampling unit has the function of being compatible with unipolar and bipolar signal conditioning, and has the good compatibility, flexibility, selectivity, adaptability and high precision.

Description

technical field [0001] The invention belongs to the technical field of signal acquisition and conditioning in a power conversion control system related to a power system, and in particular relates to a single-bipolar analog signal sampling circuit that supports multi-channel input and has a simple structure and strong functionality. The sampling circuit has the function of conditioning compatible unipolar and bipolar signals, and has good compatibility, flexibility, selectivity, applicability and high precision. Background technique [0002] At present, the general signal sampling circuit first converts the strong electric signal into a weak electric signal through the sensor, then amplifies, biases and filters the signal through the analog signal conditioning circuit, and finally enters the AD conversion chip and microprocessor for calculation and processing. deal with. [0003] On the one hand, the precision of the AD sampling chip that comes with some processors is not e...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a compatible unipolar and bipolar analog signal sampling circuit, which overcomes the problems of insufficient functionality, insufficient computing speed and precision, and poor flexibility when sampling signals of different polarities.

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