Method and circuit thereof for improving resolution of encoder by adopting secondary subdivision
An encoder and resolution technology, applied in the direction of transmitting sensing components by electric/magnetic devices, transmitting sensing components by optical devices, etc., can solve the difficulty of detector placement, difficulty in improving resolution, and limited resolution of encoders and other issues to achieve the effect of improving resolution
Inactive Publication Date: 2012-07-04
LANZHOU UNIVERSITY
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Problems solved by technology
However, the four-subdivision method has limited ability to improve the resolution of the encoder, and there is a problem that the detector is difficult to place.
Therefore, relying on the traditional method of increasing the grid on the encoder and the traditional direct subdivision method, there are great difficulties in improving the resolution of both grating encoders and magnetic grating encoders.
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[0055] Example: such as figure 2 As shown, the discrete component circuit adopts the method of two-level subdivision to improve the resolution of the encoder, including the standard clock CLK, the signal MCP shaped by the detector of the encoder, and the high-frequency clock signal CP. 4 AND gates A1, A2, A3, A4, 5 NOT gates B1, B2, B3, B4, B5, four 16-bit counters C1, C2, C3, C4, 4 16-bit data latches D1, D2 , D3, D4. One NAND gate E1, two JK flip-flops F1, F2, one 74LS90 frequency divider G1. Among them, the 16-bit counters C1, C2, C3, and C4 are respectively composed of four four-bit counters 74LS163, and the composition method is like the circuit provided by Texas Instruments (TI) in its data manual, such as image 3 shown. The 16-bit data latches D1, D2, D3, and D4 are respectively composed of two 8-bit data latches 74LS273 connected in series, such as Figure 4 shown.
[0056] The function of the circuit can be divided into the following modules, and its connection...
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The invention provides a method and a circuit thereof for improving the resolution of an encoder by adopting secondary subdivision, in particular a high frequency and high-resolution clock based secondary subdivision method. The invention can be used for improving the resolution of an encoder on the premise of stabilizing works and is suitable for magnetic grid encoders and grating encoders as well as linear encoders and radial encoders. The method comprises the following steps of: measuring the number of rising edges of a detector pulse signal MCP (Master Control Program) on an encoder in a standard clock signal CLK on the basis of a pulse counting method, i.e. measuring an integral pulse number; carrying out secondary subdivision on the detector pulse signal MCP by adopting a high-frequency clock signal CP; and finally, calculating measuring results of all sections to obtain a measured value of the encoder. In addition, the invention also provides a specific realization circuit adopting a discrete device for the method. The invention has the advantages of simple and clear principle, strong practicability, easy realization, stable and reliable circuit works and easy combination with the technologies and the application of the traditional encoders.
Description
technical field [0001] The invention relates to a method and a circuit for improving the resolution of an encoder, in particular to a method and a circuit for improving the resolution of a magnetic encoder and a grating encoder by adopting a two-stage subdivision method. Background technique [0002] Magnetic grating encoders are mainly used for the measurement of linear displacement and angular displacement, and can be divided into length magnetic grating encoders and radial magnetic grating encoders. The usual magnetic grid encoder consists of a moving object and a magnetic drum that moves with the moving object, and the magnetic drum is engraved with alternating magnetic grids. With the movement of the magnetic grid, a periodically changing magnetic field will be generated around the moving drum, and the periodically changing magnetic field will be sensed by the magnetic sensitive element (magnetic head), which will be converted into a changing voltage output signal, and ...
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IPC IPC(8): G01D5/244G01D5/38
Inventor 白建民刘明峰魏福林王建国薛松生
Owner LANZHOU UNIVERSITY