Encoder photoelectric compensation circuit, method and photoelectric encoder

Abstract

The present invention provides an encoder photoelectric compensation circuit, an encoder photoelectric compensation method and a photoelectric encoder. The circuit includes a light emitting element, agrating plate, a light receiving element and a voltage adjusting circuit; light signals transmitted by the light emitting element pass through the grating plate and then irradiate the light receivingelement, and the light receiving element outputs first photocurrent; and the voltage adjusting circuit is used for generating a first voltage according to the first photocurrent, wherein the first voltage acts on two ends of the light emitting element, and the first voltage increases as the first photocurrent decreases, and decreases as the first photocurrent increases. With the encoder photoelectric compensation circuit and the encoder photoelectric compensation method provided by the technical schemes of the invention adopted, the brightness value of the encoder is automatically adjusted, and therefore, the stability of the encoder during a use process can be ensured.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an encoder photoelectric compensation circuit, a method and a photoelectric encoder. Background technique [0002] A photoelectric encoder is an optical device composed of a series of components such as a light-emitting element, a light-receiving element, and a grating plate. , LED) is produced by photoelectric conversion of the brightness of the light, so the brightness change of the light-emitting element will directly affect the signal output of the encoder. During the use of the encoder, the brightness of the light-emitting element will be affected by the external conditions and the length of its own use. Therefore, how to ensure the brightness of the encoder's light-emitting element will affect the working stability of the photoelectric encoder. At present, the light-emitting element of the photoelectric encoder is only turned on and off by the threshold current. When aff...

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the defects of the above-mentioned prior art, and particularly relate to an encoder photoelectric compensation circuit, a method and a photoelectric encoder, so as to solve the problem of the stability of the photoelectric encoder due to the brightness change of the light-emitting element in the prior art. influences

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