A single-chip internal reference axis angle conversion circuit and method

Abstract

The invention relates to an internal reference shaft angle-to-digital conversion circuit comprising a quadrant division circuit. The quadrant division circuit is connected with a nonlinear DAC circuit, a linear DAC circuit, a phase-sensitive demodulation circuit, an integral circuit, a voltage-controlled oscillation circuit and a counting circuit in turn. The internal reference shaft angle-to-digital conversion circuit further comprises a built-in reference circuit which is connected to the phase-sensitive demodulation circuit and an external rotary transformer. The counting circuit is connected with the quadrant division circuit, the nonlinear DAC circuit and the linear DAC circuit. The invention further discloses an internal reference shaft angle-to-digital conversion method. The internal reference shaft angle-to-digital conversion circuit has a small size, the components thereof are distributed in a concentrated way, and high-density installation of system components can be realized. The conversion circuit and the conversion method of the invention are of high reliability and high degree of integration. The reliability and stability of the system are improved effectively.

Description

Technical field [0001] The invention belongs to the field of axle angle signal conversion integrated circuit methods, in particular to a reference axle angle conversion circuit and method in a single chip. It involves the axis angle-digital conversion architecture and chip-level principle circuit design. Background technique [0002] In the field of traditional shaft angle-to-digital conversion integrated circuits, the shaft angle-to-digital circuit conversion technology is usually used to adopt an external reference, and it is necessary to prepare a dedicated reference circuit, usually a DC / AC reference signal source, which is large in size and high in weight. It cannot meet the application environment that has strict requirements on the volume and reliability of the equipment. The following defects often exist: [0003] 1. The volume is large, the distribution of external reference components is relatively scattered, high-density installation of system components cannot be real...

AI Technical Summary

Problems solved by technology

[0003] 1. The volume is large, and the distribution of external reference components is relatively scattered, which cannot realize high-density installation of system components, and the volume is relatively large

[0004] 2. Poor reliability, the external reference uses a large number of discrete components, the integration level is low, and the reliability of the system is reduced

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