A circuit to prevent silver migration in encoders

Abstract

The invention provides a circuit for preventing silver migration of an encoder. A power supply control sub-circuit and an encoder actuation detection sub-circuit are arranged on the basis of the connecting circuit of the original encoder to be connected with an MCU, and normal conduction in the use state and high resistance separation in the idle state of the encoder can be further controlled through the combined effect of the MCU and the triodes in the power supply control sub-circuit and the encoder actuation detection sub-circuit. With application of the circuit for preventing silver migration of the encoder, existence time of voltage difference between the pins of the encoder can be effectively reduced, and the probability of the phenomenon of silver migration can be effectively reduced without changing the structure of the encoder or changing the coating material of the pins so that the effectiveness of the product can be enhanced, the use experience of the user can be enhanced, and the circuit has low design cost, short development period and high market competitiveness.

Description

technical field [0001] The invention relates to the technical field of encoders, in particular to a circuit for preventing silver migration of encoders. Background technique [0002] Automotive air conditioner controllers generally use rotary encoders to set the temperature and adjust the wind speed, and the rotary encoder is an electronic device that uses +5V power supply. There is a voltage difference between the three pins) or under the action of a humid environment, silver migration often occurs, resulting in product failure, affecting the user experience and increasing the user's maintenance burden. [0003] Silver migration phenomenon, that is: in reality, the three pin terminals of the encoder side by side, under a given condition (voltage difference or humid environment), the silver material on the surface of the pin terminal will migrate (from the initial position movement occurs to reach the counter electrode region for redeposition). [0004] There are three mai...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a circuit for preventing the silver migration of the encoder, which solves the problem of setting the power control sub-circuit and the encoder action detection sub-circuit to connect to the MCU, and further controls the normal conduction of the encoder when it is in use, and the high voltage when it is idle. The technical problem of effectively reducing the time when there is a voltage difference between the encoder pins

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