Force Detection Device Pre-Compression Equipotential Grounding
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Solution Overview
Problem
Existing force detection devices face challenges in achieving high precision due to drift issues caused by leakage currents and disturbance noise, which affect the accuracy of force measurement.
Innovation Solution
A force detection device configuration that includes a piezoelectric element, a pre-compression unit short-circuited with the signal ground, and a conversion output circuit with a charge amplifier, which reduces drift and enhances precision by minimizing leakage currents and shielding disturbance noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pre-compression unit is not short-circuited with the signal ground, then the structure is simpler, but drift occurs due to leakage currents and measurement precision deteriorates
Solution Approach 1:
The pre-compression unit is short-circuited with the signal ground to make them equipotential, eliminating potential difference and preventing leakage currents. This ensures the pre-compression unit does not interfere with the charge amplifier circuit, reducing drift and improving force detection precision.
2Measurement precision
If the pre-compression unit is short-circuited with the signal ground, then drift is reduced and measurement precision improves, but device complexity increases
Solution Approach 1:
The pre-compression unit is short-circuited with the signal ground to make them equipotential, eliminating potential difference and preventing leakage currents. This ensures the pre-compression unit does not interfere with the charge amplifier circuit, reducing drift and improving force detection precision.
3Reliability
If a voltage is not applied to the pre-compression unit, then the circuit is simpler, but leakage currents increase and drift occurs
Solution Approach 1:
A voltage generation circuit is introduced as an intermediary to apply an appropriate voltage to the pre-compression unit. This voltage generation circuit includes a voltage source and an attenuation circuit that drops the voltage to a level that prevents leakage currents and drift while maintaining operation stability.
4Measurement precision
If the casing is not short-circuited with the second ground, then device complexity is reduced, but disturbance noise increases and measurement precision deteriorates
Solution Approach 1:
The casing serves as an intermediary shielding structure that is short-circuited with the second ground (frame ground). This grounding structure shields disturbance noise from affecting the signal ground and charge amplifier circuit, improving force detection precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed configuration effectively reduces drift and improves force detection characteristics, enabling higher precision and longer continuous operation by maintaining a stable potential difference and effectively shielding noise.
Implementation Method 1
a force sensor that has a piezoelectric element receiving a force and outputting a charge
Implementation Method 2
a pre-compression unit that pre-compresses the force sensor
Data Source
AI summary
A force detection device includes: a force sensor that has a piezoelectric element receiving a force and outputting a charge; a pre-compression unit that pre-compresses the force sensor; and a conversion output circuit that receives the charge from the force sensor and outputs a voltage. The pre-compression unit is short-circuited with a first ground of the conversion output circuit. The pre-compression unit has the same potential as the first ground. The force detection device includes a casing that accommodates the force sensor and the conversion output circuit. The casing is short-circuited with a second ground.