Midpoint voltage self-adaptation device of magnetic resistor network and self-adaptation method

Abstract

The invention discloses a midpoint voltage self-adaptation device of a magnetic resistor network and a self-adaptation method. The self-adaptation device is connected between a magnetic resistor and a signal processing circuit and comprises a single-chip machine, a comparison circuit module, a reference voltage circuit, an electronic potentiometer and a displacement sensor, wherein the displacement sensor, the comparison circuit module and the electronic potentiometer are respectively connected with the single-chip machine, the electronic potentiometer is connected with the magnetic resistor, the output end of the single-chip machine is connected with the magnetic resistor and the signal processing circuit, and the reference voltage circuit is connected with the comparison circuit module. The midpoint voltage self-adaptation device of the magnetic resistor network and the self-adaptation method can overcome the defect that the midpoint voltage of the magnetic resistor network exceeds the required range of the signal processing circuit due to the resistance change of the magnetic resistor, and through the self-adaptation device and the self-adaptation method, the midpoint voltage of the magnetic resistor network is automatically regulated to be in the optimum range, thereby being beneficial to a flat machine of a computer to keep a normal working state.

Description

technical field [0001] The invention relates to a needle-reading sensor of a computerized flat knitting machine, in particular to a device and method for adjusting the midpoint voltage of a magneto-sensitive resistance network of the needle-reading sensor. Background technique [0002] Generally, there are one or more three-terminal differential networks composed of magnetoresistors in the chip module of the needle reading sensor of the computerized flat knitting machine. The input end of the signal processing circuit in the computerized flat knitting machine often requires the midpoint of these three-terminal differential networks Only when the voltage is kept within a certain voltage range can the computerized flat knitting machine be in a normal working state. There are usually two reasons why the midpoint voltage of the three-terminal differential network cannot maintain a certain voltage range. One is that the temperature characteristics of the magnetoresistor are relat...

AI Technical Summary

Problems solved by technology

There are usually two reasons why the midpoint voltage of the three-terminal differential network cannot maintain a certain voltage range. One is that the temperature characteristics of the magnetoresistor are relatively poor and will age after long-term use, which often causes the resistance of the magnetoresistor to change. The obvious change, thus changing the value of the midpoint voltage; the second is that the resistance changes of the two magnetoresistors that constitute the three-terminal differential network are not equal, causing the midpoint voltage of the three-terminal differential network to deviate or even drift to the set voltage value out of scope

When the midpoint voltage of the three-terminal differential network cannot maintain a certain voltage range, the working state of the signal processing circuit in the computerized flat knitting machine will be confused, and eventually the computerized flat knitting machine will not work normally.

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