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# How to solve the encoder voltage variation?

by：HENGXIANG     2020-11-07
Encoder is widely used in the design of circuit, but it may not be clear to eliminate the encoder voltage change circuit method, electronic on this issue and we discuss. 1. The calculation in the design of the largest error sources. In the design of the direct problem is: 3% error may lead to voltage 3 v to 4. Change between 5 v. So, we can first basic calculation. Digital encoder is 50 k Ω ( 25% tolerance) R1 is 16. 5 k ( 1%) R2 is 100 k ( 1%) 。 Encoder end-to-end resistance is 25% of the tolerance design of the largest error sources. 2. Different tap resistance the same calculation. Consider using different tap resistance the same calculation, if the encoder is 37. The top 5 k Ω, voltage is 4. 46 v, low side to 3. 25 v; If the encoder is 62. The top 5 k Ω, voltage is 4. 54 v, the low voltage of 2. 79 v。 This circuit, the encoder end-to-end resistance value deviation is bigger, can't use this basic framework to solve the voltage change. Introduce two voltage reference circuit, control error and temperature coefficient, and the end-to-end digital encoder absolute deviation will change the loop current, but does not affect the voltage. Output voltage changes in proportion, only depends on the resistance than the encoder tap position. Both benchmark by feedback control the output voltage, R2 ( 25 k to 50 k) To determine the two benchmark source current. Shanghai electronic products co. , LTD. , specializing in the production of the encoder, 25 years, encoder with complete variety, product quality, have gained good reputation among the customers and the industry for many years, looking for looking for electronic encoder manufacturers.
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