Absolute encoder

Abstract

The utility model provides an absolute encoder. The absolute encoder comprises a light source unit, a light sensing chip, a first binarization integrated circuit, a second binarization integrated circuit, an analog-to-digital conversion circuit, an interpolation calculation integrated circuit and a counting integrated circuit, wherein the light source unit is used for generating light signals; the light sensing chip is used for receiving the light signals; the light sensing chip comprises a first light sensing module and a second light sensing module, the first light sensing module is used for converting the light signals into absolute position signals, the second light sensing module is used for converting the light signals into analog signals, and the first binarization integrated circuit is connected with the first light sensing module. The second photosensitive module is connected with the analog-to-digital conversion circuit and the second binary integrated circuit. The first binary integrated circuit and the analog-to-digital conversion circuit are connected with the interpolation calculation integrated circuit. And the counting integrated circuit is connected with the second binary integrated circuit. The signal processing efficiency can be effectively improved, and the design cost of an electrical loop can be reduced.

Description

Technical Field

[0001] This application relates to the field of encoding technology, and more particularly to an absolute encoder. Background Technology

[0002] To simultaneously achieve single-turn absolute position determination and multi-turn counting, the existing absolute encoder requires the photosensitive chip to receive two independent electrical signals: a single-turn signal and a multi-turn signal. Furthermore, the absolute encoder's PCB needs to be equipped with two independent electrical circuits (a single-turn signal processing circuit and a multi-turn signal processing circuit) to process the single-turn and multi-turn signals respectively. This results in complex PCB electrical circuit design, high manufacturing costs, and low signal processing efficiency. Summary of the Invention

[0003] This application addresses the problems in the prior art by providing an absolute encoder that can achieve absolute position determination and multi-turn counting by processing only a single-turn signal, thereby effectively improving signal processing efficiency and reducing electrical circuit design costs.

[0004] An absolute encoder includes: a light source unit for generating an optical signal, a photosensitive chip for receiving the optical signal, a first binarization integrated circuit, a second binarization integrated circuit, an analog-to-digital conversion circuit, an interpolation calculation integrated circuit, and a counting integrated circuit;

[0005] The photosensitive chip is disposed in the optical path of the light source unit. The photosensitive chip includes a first photosensitive module for converting the optical signal into an absolute position signal and a second photosensitive module for converting the optical signal into an analog signal. The second photosensitive module is provided with a first analog signal output terminal and a second analog signal output terminal. The first photosensitive module is connected to the input terminal of the first binarization integrated circuit, the first analog signal output terminal is connected to the input terminal of the analog-to-digital conversion circuit, and the output terminals of the first binarization integrated circuit and the analog-to-digital conversion circuit are connected to the interpolation calculation integrated circuit.

[0006] The second analog signal output terminal is connected to the input terminal of the second binarization integrated circuit, and the counting integrated circuit is connected to the output terminal of the second binarization integrated circuit.

[0007] Compared to existing technologies, the first and second photosensitive modules of the photosensitive chip in this application convert the optical signal into an absolute position signal and an analog signal, respectively. These two signals are then processed through different processing paths before being input into the interpolation calculation integrated circuit to obtain a single-turn absolute position confirmation result. Simultaneously, the analog signal from the second photosensitive module is binarized and counted to obtain the encoder multi-turn count result. By employing multiple parallel processing methods, processing only the single-turn signal (composed of an absolute position signal and an analog signal) is sufficient to obtain both the single-turn absolute position confirmation result and the encoder multi-turn count result, effectively improving signal processing efficiency and reducing electrical circuit design costs.

[0008] To provide a clearer understanding of this application, the specific embodiments of this application will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of an absolute encoder according to this application;

[0010] Figure 2 This is a schematic diagram of the light source unit in an absolute encoder according to this application. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0012] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed in order or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0013] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0014] Please see Figure 1 , Figure 1This is a schematic diagram of an absolute encoder according to this application.

[0015] This application provides an absolute encoder, including: a light source unit 1 for generating light signals, a light sensing chip 2 for receiving the light signals, a first binarization integrated circuit 3, a second binarization integrated circuit 4, an analog-to-digital conversion circuit 5, an interpolation calculation integrated circuit 6, and a counting integrated circuit 7;

[0016] The photosensitive chip 2 is disposed in the optical path of the light source unit. The photosensitive chip 2 includes a first photosensitive module 21 for converting the optical signal into an absolute position signal and a second photosensitive module 22 for converting the optical signal into an analog signal. The second photosensitive module 22 is provided with a first analog signal output terminal 221 and a second analog signal output terminal 222. The first photosensitive module 21 is connected to the input terminal of the first binarization integrated circuit 3, the first analog signal output terminal 221 is connected to the input terminal of the analog-to-digital conversion circuit 5, and the output terminals of the first binarization integrated circuit 3 and the analog-to-digital conversion circuit 5 are connected to the interpolation calculation integrated circuit 6.

[0017] The second analog signal output terminal 222 is connected to the input terminal of the second binarization integrated circuit 4, and the counting integrated circuit 7 is connected to the output terminal of the second binarization integrated circuit 4.

[0018] In this embodiment, the photosensitive chip is model NJL6901R, the analog-to-digital conversion circuit is model ADS1115IDGSR, the first binarization integrated circuit and the second binarization integrated circuit are model NJU7116, the interpolation calculation integrated circuit is model MB87S4513PMC-G-JN, and the counting integrated circuit 7 is an integrated circuit capable of edge counting.

[0019] Of course, in other embodiments, the photosensitive chip, analog-to-digital conversion circuit, first binarization integrated circuit, second binarization integrated circuit and interpolation calculation integrated circuit can be selected from other models, which will not be described in detail here.

[0020] The principle of this application's absolute encoder simultaneously obtaining single-turn absolute position confirmation results and encoder multi-turn counting results is as follows: The photosensitive chip 2 receives the light signal generated by the light source unit 1, and the first photosensitive module 21 and the second photosensitive module 22 convert the light signal into an absolute position signal and an analog signal, respectively; the first binarization integrated circuit 3 receives the absolute position signal and converts it into a binarized pulse signal; the analog-to-digital conversion circuit receives the analog signal output by the first analog signal output terminal 221 and converts it into a first digital signal; the binarized pulse signal and the binarized digital signal are input into the interpolation calculation integrated circuit 6 for processing to obtain the single-turn absolute position confirmation result.

[0021] The second binarization integrated circuit 4 receives the analog signal output from the second analog signal output terminal 222 and converts it into a second digital signal. The second digital signal is then input into the counting integrated circuit 7 for processing to obtain the encoder multi-turn counting result.

[0022] Compared with existing technologies, the first and second photosensitive modules of the photosensitive chip in this solution convert the optical signal into an absolute position signal and an analog signal, respectively. These two signals are then processed by a first binarization integrated circuit and an analog-to-digital converter circuit, respectively, and the results are input together into the interpolation calculation integrated circuit to obtain the single-turn absolute position confirmation result. Simultaneously, the analog signal from the second photosensitive module is binarized and counted to obtain the encoder multi-turn count result. Through multiple parallel processing methods, processing only the single-turn signal (composed of the absolute position signal and the analog signal) is sufficient to obtain both the single-turn absolute position confirmation result and the encoder multi-turn count result, effectively improving signal processing efficiency and reducing electrical circuit design costs.

[0023] In this embodiment, please also refer to Figure 2 , Figure 2 This is a schematic diagram of a light source unit in an absolute encoder according to this application. The light source unit 1 includes: a light source 11 and an encoder disk 12 having a light-transmitting area and a light-blocking area. The photosensitive chip 2 is disposed in the optical path formed by the light source 11, and the encoder disk 12 is rotatably disposed between the light source 11 and the photosensitive chip 2. The light-transmitting area and the light-blocking area can be a light-transmitting pattern and a light-blocking pattern, the light source 11 can be an LED light source, and the encoder disk 12 can be a grating plate assembly.

[0024] The photosensitive chip 2 receives the optical signal modulated by the encoder disk 12. The modulation process is as follows: when the optical signal generated by the light source 11 penetrates the light-transmitting area of ​​the encoder disk 12, the optical signal is transmitted along the optical path to the photosensitive chip 2, and the photosensitive chip 2 generates a single-turn signal; when the optical signal is blocked by the opaque area of ​​the encoder disk 12, the photosensitive chip 2 will not generate an electrical signal or will generate a weak electrical signal. The single-turn signal consists of an absolute position signal and an analog signal.

[0025] This application is not limited to the above-described embodiments. If any modifications or variations to this application do not depart from the spirit and scope of this application, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this application, then this application also intends to include such modifications and variations.

Claims

1. An absolute encoder, characterized in that The application relates to a photoelectric sensor, which comprises the following parts: a light source unit for generating a light signal, a light sensing chip for receiving the light signal, a first binary integrated circuit, a second binary integrated circuit, an analog-digital conversion circuit, an interpolation operation integrated circuit and a counting integrated circuit; the light sensing chip is arranged in the light path of the light source unit, the light sensing chip comprises a first light sensing module for converting the light signal into an absolute position signal and a second light sensing module for converting the light signal into an analog signal, the second light sensing module is provided with a first analog signal output end and a second analog signal output end; the first light sensing module is connected with the input end of the first binary integrated circuit, the first analog signal output end is connected with the input end of the analog-digital conversion circuit, and the output end of the first binary integrated circuit and the output end of the analog-digital conversion circuit are connected with the interpolation operation integrated circuit; the second analog signal output end is connected with the input end of the second binary integrated circuit, and the counting integrated circuit is connected with the output end of the second binary integrated circuit.

2. An absolute encoder according to claim 1, characterized in that The light source unit comprises a light source and an encoding disc provided with a light-transmitting area and a non-light-transmitting area, the light sensing chip is arranged in the light path formed by the light source, and the encoding disc is rotatably arranged between the light source and the light sensing chip.

3. An absolute encoder according to claim 1, characterized in that The model of the light sensing chip is NJL6901R.

4. An absolute encoder according to claim 1, characterized in that The model of the analog-digital conversion circuit is ADS1115IDGSR.

5. An absolute encoder according to claim 1, characterized in that The models of the first binary integrated circuit and the second binary integrated circuit are NJU7116.

6. An absolute encoder according to claim 1, characterized in that The model of the interpolation operation integrated circuit is MB87S4513PMC-G-JN.

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