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Absolute photoelectric encoder decoding circuit

A technology of photoelectric code disc and decoding circuit, which is applied in the field of communication, can solve the problems that the decoding circuit and the overall accuracy of the control system are greatly affected, the circuit is not self-adaptive, and the service life is short, so as to achieve a high accuracy rate of fault diagnosis , strong self-adaptive ability and high circuit reliability

Inactive Publication Date: 2018-01-19
史树元
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AI Technical Summary

Problems solved by technology

The current decoding circuit generally uses electronic subdivision technology to improve the resolution and accuracy of the photoelectric shaft encoder, but the circuit itself is not self-adaptive to the impact of the environment. Therefore, the subdivision introduced under different environmental conditions The error has a great influence on the decoding circuit and the overall accuracy of the control system
At the same time, due to the limitations of the traditional decoding circuit structure, there are serious defects such as poor versatility, short service life and high failure rate.

Method used

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  • Absolute photoelectric encoder decoding circuit

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with drawings and embodiments.

[0018] Such as figure 1 , the coarse code comparison amplifier circuit uses the operational amplifier as a comparator to compare the original signal of the coarse code with its comparison voltage to obtain an output signal. If the comparison voltage of the coarse code is properly selected, it can be well guaranteed to reshape the original trapezoidal wave signal of the coarse code into a square wave signal. The sampling resistor R1 converts the original photocurrent signal of the rough code into a voltage signal, and compares it with the +5V divided voltage on R2 and R3 (that is, the pin 6 voltage). If it is higher than the comparison voltage, the coarse code output voltage u=3.3 v, if it is lower For comparison voltage, the coarse code output is 0V.

[0019] Such as figure 2 , In the fine code differential amplifier circuit, the four signals of fine code are E0, E9...

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Abstract

An absolute photoelectric encoder decoding circuit is suitable for communication field and consists of a coarse code comparison amplification circuit, a precise code differential amplification circuit, a coarse code adaptive comparison level circuit, and an adaptive gain amplifier control circuit, and is high reliability, high in fault diagnosis accuracy, good in adaptability, low in precision loss and low in bit error rate.

Description

Technical field [0001] The invention relates to an absolute photoelectric code disk decoding circuit, which is suitable for the communication field. Background technique [0002] The photoelectric encoder can realize the digital measurement of the angular position and provide control information for the control system. And because of its photoelectric sensing, compared with other sensors, it has incomparable advantages such as high measurement accuracy, fast response speed, wide measurement range, strong anti-interference ability, small size, good working reliability, non-contact measurement and easy control. Therefore, it is widely used in various fields such as modern military, aerospace, robot industry, medicine, and biological engineering. Many precision measurement and control equipment, such as: precision rotary table, goniometer, photoelectric theodolite, radar, ground commander robot, numerical control machine tool and high-precision closed-loop speed control system...

Claims

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Application Information

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IPC IPC(8): G01D5/347
Inventor 史树元
Owner 史树元
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