Encoder Detection Head Voltage Adjustment Circuit
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Solution Overview
Problem
Electromagnetic induction type encoders face challenges in maintaining signal strength equality across multiple tracks with different wavelengths, leading to inaccurate position detection due to varying signal intensities, and existing solutions consume excessive power to adjust voltages.
Innovation Solution
A detection head with a switched capacitor circuit that adjusts the charging voltage of the driving capacitor using a transformer capacitor, allowing for the generation of alternate-current magnetic fields with different voltages from a single power supply, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple power supplies are prepared to charge capacitors in excitation circuits for different tracks, then signal strength equality across tracks is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent merges multiple power supply functions into a single power supply by introducing a voltage adjustment circuit. This circuit selectively connects the single power supply to different excitation circuits through switching elements, thereby eliminating the need for multiple separate power supplies while maintaining signal strength equality across different tracks
Solution Approach 2:
The voltage adjustment circuit serves as an intermediary between the single power supply and multiple excitation circuits. It mediates the voltage distribution by selectively charging capacitors in different excitation circuits to appropriate voltage levels, ensuring equal signal strength without requiring multiple power supplies
2Adaptability or versatility
If resistance-voltage division and buffer circuits are used to achieve power supplies proportional to power supply voltage, then voltage proportionality is achieved, but power consumption increases and battery life decreases
Solution Approach 1:
The patent extracts the essential function of voltage proportionality from the power supply system by using a voltage adjustment circuit that selectively charges capacitors to appropriate voltage levels. This eliminates the need for continuous power-consuming resistance-voltage division and buffer circuits, achieving voltage proportionality only when needed while minimizing power consumption
Solution Approach 2:
The voltage adjustment circuit operates periodically by selectively charging capacitors in excitation circuits only when voltage adjustment is needed. This periodic action replaces continuous power-consuming voltage division and buffering, achieving voltage proportionality while significantly reducing overall power consumption and extending battery life
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
Enables the excitation of transmission coils with different voltages using a single power supply with low power consumption, ensuring accurate signal strength across multiple tracks without significant battery life reduction.
Implementation Method 1
a resonant circuit that includes a driving capacitor and a transmission coil connected in series and generates an alternate-current magnetic field inducing currents in scale coils disposed in a plurality of scale tracks on a scale
Implementation Method 2
a voltage adjustment circuit including a first transformer capacitor and configured to control a charging voltage of the driving capacitor in a single excitation circuit using the charged first transformer capacitor
Data Source
AI summary
An object is to respectively excite transmission coils with different voltages using a single power supply with low power consumption in an electromagnetic induction type encoder. A detection head of an encoder includes a voltage adjustment circuit and a plurality of excitation circuits. The excitation circuit includes a resonant circuit that includes a driving capacitor and a transmission coil connected in series and generates an alternate-current magnetic field inducing currents in scale coils disposed in a plurality of scale tracks on a scale by connecting both ends of the resonant circuit in a state in which the driving capacitor is charged. The voltage adjustment circuit includes a first transformer capacitor and controls a charging voltage of the driving capacitor in a single excitation circuit using the charged first transformer capacitor.