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The method of circuit to eliminate the encoder voltage change

by:HENGXIANG     2020-11-05
Eliminate the encoder voltage change, the design is expected to be the problems caused by errors will be: 3% error may lead to voltage 3 v to 4. Change between 5 v. The basic calculation can be performed. 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. Now 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. Through the above method of voltage change in the circuit to eliminate the encoder, the interpretation of people if they know something about it? Shanghai electronics is established professional manufacturer of encoders, 26 years research and development of manufacturing, we focus on encoder encoder products in brand at home and abroad customers, and get the customer the consistent high praise, good products, quality is the survival way, find the encoder manufacturers will find electronic!
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