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Method for eliminating direct-current offset of angular displacement sensor

A technology of angular displacement sensor and DC bias, which is applied in the direction of instruments, measuring devices, and mitigating unwanted effects, can solve the problems of high hardware overhead and achieve the effect of small software and hardware overhead and simple and direct algorithm

Inactive Publication Date: 2017-01-11
广东盈动高科自动化有限公司
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  • Description
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Problems solved by technology

[0012] The invention provides a method for removing the DC bias of the angular displacement sensor, which is used to solve the problem that the existing algorithm needs to do a large number of addition operations and the hardware overhead is very large

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  • Method for eliminating direct-current offset of angular displacement sensor
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  • Method for eliminating direct-current offset of angular displacement sensor

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Embodiment Construction

[0028] This patent explores and implements a compromise solution under the premise of satisfying the set accuracy, replacing the expensive accumulation and averaging solution. The specific idea is as follows: detect the maximum and minimum values ​​of the signal within a cycle, calculate the average value of the maximum and minimum values ​​as the DC component, and then subtract the DC component from the initial signal to obtain the debiased signal. Specific description is given below by way of examples.

[0029] see Figure 5 As shown, the method for removing the DC bias of the angular displacement sensor in this embodiment is characterized in that it includes the following steps:

[0030] S11. Store the initial signal value.

[0031] S12. In the next period, compare adjacent signal values ​​to obtain a maximum signal value and a minimum signal value within this period. In a specific implementation, in the next cycle, a comparator can be used to compare the latter value wi...

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Abstract

The invention provides a method for eliminating a direct-current offset of an angular displacement sensor, which relates to the electronic circuit field. With the method, a problem that the existing algorithm needs lots of additive operations and thus the hardware cost is high can be solved. The method comprises: S1, an initial signal value is stored; S2, adjacent signal values are compared within a following period to obtain a maximum signal value and a minimum signal value within the period; S3, an average value of the maximum signal value and the minimum signal value is calculated; and S4, subtraction between the initial signal value and the average value is carried out to eliminate a direct-current component. According to the invention, the algorithm is simple and direct; and the software and hardware costs are low.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of electronic circuits, in particular to a method for removing the DC bias of an angular displacement sensor. [0003] 【Background technique】 [0004] The angular displacement sensor is a device used to detect the angular displacement of the rotating shaft relative to the starting position. The demodulation chip is used to convert the analog signal output by the detection mechanism into a digital signal, and use the demodulation circuit inside the chip to solve the precise position change information. [0005] The detection mechanism of the angular displacement sensor outputs two sine wave and cosine wave signals with the same frequency, similar amplitude and 90 degree phase difference. The formulas of the horizontal and vertical coordinates are as follows. For details, see figure 1 as shown, [0006] [0007] [0008] The two signals are quadrature demodulated to obtain the X and Y coordinates, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/22G01D3/028
CPCG01B21/22G01D3/028
Inventor 谢修祥刘学钱炜
Owner 广东盈动高科自动化有限公司
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