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Combinational logic decoder unit for double-stage rotary encoder of open canal flow meter

A rotary encoder and open channel flowmeter technology, which is applied in the field of open channel flowmeter dual-stage rotary encoder combined logic decoding device, can solve the problems of single-stage encoders with difficult and large range, and achieve strong anti-electromagnetic interference ability and circuit Simple, no crash effect

Inactive Publication Date: 2005-03-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitations of volume and processing technology, it is difficult for single-stage encoders to achieve such a large range

Method used

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  • Combinational logic decoder unit for double-stage rotary encoder of open canal flow meter
  • Combinational logic decoder unit for double-stage rotary encoder of open canal flow meter
  • Combinational logic decoder unit for double-stage rotary encoder of open canal flow meter

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Experimental program
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Embodiment Construction

[0025] The digital code output by the open channel flowmeter encoder is composed of low-level coded numbers and high-level coded numbers. The low-level coded numbers use ordinary Gray code (Gray code), and a total of 9 data lines L 1 L 1 L 2 L 3 L 8 L 9 , That is, 9-bit encoding, there are 511 states, among which 0-499 states (that is, 6-505), it uses (000000101) G Represents 0, (000000100) G Represents 1...and so on. The high-level coded numbers have 5-bit data lines (H 1 H 2 H 3 H 5 ), using pure binary code, indicating the range: 00000~11111.

[0026] The relationship between the high-level coded digits and the low-level coded digital output data is: the low bit turns 1 circle, the high bit turns 1 bit, so the real number output by the open channel flowmeter encoder is: output number = (high bit number × 500) + low bit number.

[0027] Input circuit 1’,

[0028]The common end (through loop) of the encoder of the input circuit 1'is directly connected to the +20VDC power supp...

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Abstract

The combination logic decoder unit consists of input circuit, G / B conversion circuit, 6 subtraction circuit, B / BCD conversion circuit, high and low bit operation circuit, high bit selection circuit, output interface circuit and other circuits. It is designed with CMOS combination logic circuit device to realize Gray / binary code conversion, multiplication, addition and other functions. Its operation mode is non-sequential, that is , the present state is independent on historical state, and this avoid dead halt, program runaway, etc. The present invention has simple circuit, low power consumption, high reliability, high electromagnetic jamming resistance, etc.

Description

Technical field [0001] The invention relates to a combination logic decoding device of an open channel flow meter two-stage rotary encoder. It belongs to the technical field of measurement and control instruments. Background technique [0002] The digital open channel flowmeter uses the standard type of flow-measuring building Parshall flume, "V"-shaped groove, other weir grooves and its stable water level-flow relationship, and calculates the flow rate by measuring the water level. Open channel flowmeters often use rotary encoders, and are equipped with a precision speed change mechanism, a hanging wheel, a measuring rope, a heavy hammer, and a float. The principle is that the float floats on the water surface with a stable waterline. When the water level changes, the float rises or falls. The measuring rope connected to the float drives the hanging wheel to rotate, and the encoder is rotated through the speed change mechanism to output and The digital code corresponding to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/52G01F1/56G06F7/38
Inventor 徐立中李德富
Owner HOHAI UNIV