Speed regulation controller analog signal input acquisition circuit and function safety guarantee method thereof

Abstract

The invention relates to a speed regulation controller analog signal input acquisition circuit and a function safety guarantee method thereof. The speed regulation controller analog signal input acquisition circuit comprises an analog signal input protection circuit, a double-channel redundant signal sampling and acquisition circuit, a digital isolation circuit and a function safety CPU circuit, wherein the double-channel redundant signal sampling and collecting circuit comprises a signal sampling and collecting circuit A and a signal sampling and collecting circuit B, the function safety CPU circuit is internally provided with function safety software, operates and judges a received analog signal input collection result, achieves real-time monitoring of analog input faults, triggers alarm or safety failure protection according to the severity of the faults, and guarantees the functional safety of the digital electronic speed regulation controller. According to the invention, the designed double-channel redundant signal sampling and collecting circuit is relatively independent so as to achieve abnormal monitoring of the sampling function of the data collecting chip by sampling the reference voltage of the double-channel redundant signal sampling and collecting circuit, and mutual supervision is achieved by collecting the working state of the power supply voltage and the reference voltage of the data collecting chip of the opposite side.

Description

technical field [0001] The invention relates to the technical field of digital electronic speed control controllers, in particular to a speed control controller analog signal input acquisition circuit and a function safety guarantee method thereof. Background technique [0002] Functional safety is a key technology to ensure the safe operation of equipment and systems in safety-critical fields such as nuclear power and petrochemicals. It aims to prevent dangerous accidents caused by safety-related devices due to design defects or random failures of equipment. Digital electronic speed controller is used as a speed control device for diesel generator sets, turbine units and many other equipment in nuclear power, petrochemical and other industries. Its functional safety is of great value to ensure the safe and reliable operation of related equipment and systems. [0003] With the continuous improvement of functional safety requirements in related industries, it is increasingly ...

AI Technical Summary

Problems solved by technology

[0003] With the continuous improvement of functional safety requirements in related industries, it is increasingly difficult for traditional speed controllers to meet the actual application requirements because they do not adopt functional safety design.

Analog signal acquisition is one of the necessary basic functions of digital electronic speed controllers. Traditional analog signal acquisition only completes basic data acquisition functions, lacks circuit security and fault diagnosis capabilities, and is difficult to identify the analog signal acquisition circuit itself and signal abnormalities. Faults, bringing hidden dangers to the safe operation of equipment

For this reason, multiple analog signal acquisition modules can only be used to build redundant analog signal acquisition subsystems, or multiple speed controllers can be directly redundant to improve system security and reliability, resulting in complex system structure and high costs.

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