Watch Voltage Control for Continuous Temperature Compensation
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Solution Overview
Problem
Existing electronic watches with temperature compensation circuits face issues with restarting the adjustment operation of oscillation frequency after a power supply voltage drop, leading to repeated stopping and starting, which shortens the period of accurate timekeeping.
Innovation Solution
A watch with a power supply, crystal oscillation circuit, divider circuit, temperature compensation circuit, and control circuit that detects and manages voltage levels to continue temperature compensation operations even when the power supply voltage falls below a certain threshold, preventing repeated restarts and maintaining time accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature compensation circuit stops the adjustment operation when power supply voltage equals or less than reference voltage, then power consumption is reduced and device stability is improved, but time accuracy deteriorates due to repeated stopping and starting of the adjustment operation
Solution Approach 1:
The control circuit detects when the power supply voltage exceeds the reference voltage and performs the temperature compensation adjustment operation in advance. By storing the temperature compensation data in advance when voltage is sufficient, the system ensures that time accuracy adjustment can be performed before voltage drops occur, preventing repeated stopping and starting of the adjustment operation.
Solution Approach 2:
The control circuit is designed to continue or restart the temperature compensation adjustment operation even when the power supply voltage drops below the reference voltage during operation. This ensures continuous time accuracy maintenance by allowing the adjustment operation to complete or resume, rather than stopping repeatedly due to voltage fluctuations.
2Measurement precision
If the temperature compensation circuit restarts the adjustment operation when power supply voltage exceeds reference voltage, then time accuracy is improved, but device stability deteriorates due to repeated stopping and starting of the adjustment operation
Solution Approach 1:
The control circuit continuously monitors the power supply voltage and uses this feedback to make intelligent decisions about when to perform or continue the temperature compensation adjustment operation. By detecting voltage levels in real-time and adjusting the compensation operation accordingly, the system maintains time accuracy while avoiding instability from repeated stopping and starting.
3Measurement precision
If the adjustment operation is performed when power supply voltage is close to reference voltage, then time accuracy is improved, but the risk of voltage drop increases causing repeated stopping and starting
Solution Approach 1:
The system performs temperature compensation adjustment operations in advance when the power supply voltage is sufficiently high (exceeds reference voltage). By completing the adjustment operation before voltage drops occur, the system maximizes the period of accurate timekeeping and avoids repeated stopping that would waste time.
Data Source
AI summary
A watch includes a chargeable power supply, a crystal oscillation circuit including a crystal oscillator and an oscillation circuit and configured to stop oscillating when a power supply voltage falls below an oscillation stop voltage and to start oscillating when the power supply voltage exceeds an oscillation start voltage, which is higher than the oscillation stop voltage, and a divider circuit that outputs a reference signal by dividing an oscillation signal output from the oscillation circuit. The watch also includes a temperature compensation circuit that performs a temperature compensation function operation that compensates for variation of the reference signal due to a temperature, a first voltage detection circuit that detects that the power supply voltage exceeded a first voltage that is set higher than the oscillation start voltage, and a control circuit that starts the temperature compensation function operation of the temperature compensation circuit when the first voltage detection circuit detects that the power supply voltage exceeded the first voltage, and subsequently continues the temperature compensation function operation even when the power supply voltage falls below the first voltage.