Absolute photoelectric encoder decoding circuit
A technology of photoelectric code disc and decoding circuit, which is applied in the field of communication, can solve the problems that the decoding circuit and the overall accuracy of the control system are greatly affected, the circuit is not self-adaptive, and the service life is short, so as to achieve a high accuracy rate of fault diagnosis , strong self-adaptive ability and high circuit reliability
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[0017] The present invention will be further described below with reference to the drawings and embodiments.
[0018] Such as figure 1 , The coarse code comparison amplifier circuit uses an operational amplifier as a comparator to compare the original signal of the coarse code with its comparison voltage to obtain the output signal. If the comparison voltage of the coarse code is selected appropriately, it can be well ensured that the original trapezoidal wave signal of the coarse code is shaped into a square wave signal. The sampling resistor R1 turns the original photocurrent signal of the coarse code into a voltage signal, and compares it with +5V on R2 and R3 (ie the voltage of pin 6). If it is higher than the comparison voltage, the coarse code output voltage u=3.3V, if it is low For comparison voltage, the coarse code output is 0V.
[0019] Such as figure 2 , In the fine code differential amplifier circuit, the four fine code signals are E0, E90, E180, E270. The four signal...
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