Position sensor and changeable capacitance module of same

Abstract

The invention provides a position sensor and a changeable capacitance module of the same. The position sensor comprises the changeable capacitance module and a circuit board. The changeable capacitance module comprises a baseplate and a dielectric coupling substance, wherein the baseplate comprises a baseplate body, a grounding electrode and two power source electrodes; the grounding electrode and the two power source electrodes are disposed on the baseplate body; the power source electrodes are disposed on the other side at an interval; the dielectric coupling substance and the two power source electrodes are set at an interval and the dielectric coupling substance is used to move along an action path. When the dielectric coupling substance moves along the action path, covering conditions for the dielectric coupling substance to cover the two power source electrodes and the grounding electrode will be changed. When a power source supplies power to the two power source electrodes in an alternating manner, a pair of alternating capacitance values sensed by a capacitance sensing circuit will vary with changes of the covering position, so that a relative position of the dielectric coupling substance on the action patch and the circuit board can be defined. According to the invention, the capacitance value is changed through changes of the covering rate of electrode coverage of the dielectric coupling substance.

Description

technical field [0001] The present invention relates to a position sensor and its variable capacitance assembly, in particular to a position sensor and its variable capacitance which utilizes the change of the area covered by at least two electrode sheets to be covered by a dielectric coupling to change the marginal capacitance components. Background technique [0002] Generally speaking, the existing potentiometers mainly use the change of the resistance value of the variable resistor as the basis of displacement sensing. The service life is reduced, so in the prior art, the displacement sensing technology based on the principle of capacitive effect is under development. [0003] see figure 1 , figure 1 A schematic plan view showing the capacitive effect generated between two electrode plates in the prior art. As shown in the figure, in common circuit configurations, electronic components such as capacitors are often seen, and the capacitive effect is mainly caused by t...

AI Technical Summary

Problems solved by technology

As shown in the figure, because an electric field will be generated between the two electrode plates due to the potential difference, in the existing technology, conductive metals such as copper are usually used as the material of the electrode plates, for example, the two metal copper electrode plates are made of The overlapped state (displacement is 0%) moves horizontally to complete overlap (displacement is 50%), and then moves away horizontally (displacement is 100%), and the capacitance value between the two metal copper electrode plates changes as Figure 3, it can be known that between two conductive metal plates The capacitance value changes less significantly

[0006] It can be seen from the above description that the magnitude of the capacitance value change due to the movement between the two metal electrode plates is not sensitive, so when the technology using the parallel capacitance effect is applied to When using a displacement sensor, the sensitivity of the displacement sensed by the capacitance change is poor, which cannot be accurately controlled by the user

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