Voltage Determination Circuit for Clock Hand Detection
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Solution Overview
Problem
Conventional voltage determination devices for clock hands face challenges in accurately determining the level of counter electromotive voltage due to noise interference, leading to incorrect power supply decisions that increase power consumption and circuit size, especially when threshold values are not optimally set.
Innovation Solution
A voltage determination device with a reference voltage generation circuit, a determining circuit, and a control unit that adjusts the resistivity between voltage lines to maintain a specific current level, allowing accurate determination of the counter electromotive voltage while minimizing circuit size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold value is set lower to detect clock hand movement, then movement detection sensitivity improves, but false detection due to noise increases
Solution Approach 1:
The patent applies dynamics by making the threshold value variable rather than fixed. The threshold determination circuit dynamically adjusts the threshold based on the power source voltage level, allowing the system to adapt to different operating conditions. This resolves the contradiction by enabling high sensitivity when voltage is stable while maintaining reliability when voltage fluctuates, as the threshold automatically optimizes for current operating conditions.
Solution Approach 2:
The patent changes the parameter of threshold voltage based on power source voltage levels. By establishing a relationship between the power source voltage and the comparison threshold, the system adjusts the threshold parameter to match operating conditions. This allows accurate movement detection across different voltage scenarios while preventing false detections, effectively resolving the sensitivity-reliability contradiction.
2Reliability
If the threshold value is set higher to avoid false detection, then reliability improves, but power consumption increases due to unnecessary current supply
Solution Approach 1:
The system dynamically adjusts the threshold based on power source voltage, enabling reliable operation across different voltage conditions without consistently high power consumption. When voltage is high, the threshold can be higher to avoid false detections; when voltage is lower, the threshold adjusts accordingly to maintain detection accuracy while reducing unnecessary current supply.
Solution Approach 2:
By changing the threshold parameter in response to power source voltage variations, the system optimizes the balance between reliability and power consumption. The threshold determination circuit ensures the threshold is appropriately set for each operating condition, preventing both false detections and unnecessary current supply that would waste power.
3Measurement precision
If the gate length and gate width of transistors are adjusted to control threshold value, then voltage determination accuracy improves, but circuit area increases
Solution Approach 1:
The patent introduces a threshold determination circuit as an intermediary component that generates the appropriate threshold value based on power source voltage. Instead of relying on fixed transistor dimensions, this intermediary circuit dynamically provides the correct threshold, achieving accurate voltage determination without requiring large transistor gate areas. The intermediary circuit decouples the relationship between transistor size and threshold accuracy.
Solution Approach 2:
The system segments the voltage determination function into separate components: the NAND circuit for logical operation and the threshold determination circuit for setting the comparison reference. This segmentation allows the threshold to be independently optimized based on power source voltage without requiring large transistor dimensions in the main logic circuit, thus reducing overall circuit area while maintaining accuracy.
4Use of energy by moving object
If the power source voltage is reduced to minimize battery usage, then energy consumption decreases, but the ability to accurately determine voltage level deteriorates
Solution Approach 1:
The system dynamically adapts the threshold value to match the power source voltage level. When using reduced-voltage batteries to minimize energy consumption, the threshold determination circuit automatically adjusts the comparison threshold to the appropriate level, ensuring accurate voltage determination remains possible even at lower operating voltages. This dynamic adaptation maintains measurement precision across different energy consumption scenarios.
Solution Approach 2:
The patent changes the threshold parameter in direct response to power source voltage changes. By establishing a proportional relationship between power source voltage and threshold value, the system ensures that voltage level determination accuracy is maintained regardless of the absolute voltage level or energy consumption requirements. This parameter adaptation allows accurate measurement with both high and low voltage power sources.
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 solution enables precise determination of the counter electromotive voltage, reducing power consumption and circuit size by maintaining a constant threshold value and controlling current flow, thus optimizing the operation of clock hands.
Implementation Method 1
When the clock hand moves, a counter electromotive voltage is generated
Data Source
AI summary
A semiconductor device includes a reference voltage generation circuit to which a power source voltage is applied; an output terminal for outputting an output voltage; a determining circuit connected to the reference voltage generation circuit and the output terminal for generating the output voltage according to a determination target voltage; and a constant electric current source connected to the determining circuit and a ground potential for generating a constant electrical current.