Timepiece Initialization Circuit for Battery Chattering Immunity
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Solution Overview
Problem
Existing electronic timepieces face issues with internal circuit initialization when a battery is installed, particularly due to chattering at the power supply terminal, which can unintentionally set circuits to incorrect operating modes.
Innovation Solution
An electronic circuit with an oscillator, function control circuit, initialization circuit, initialization control circuit, input control circuit, and initialization state holding circuit, where the initialization circuit outputs an initialization control signal at a first level until the clock signal is output, and the input control circuit manages the function control signal input to ensure reliable initialization, even during chattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the initialization control circuit responds to function control signals during battery installation, then the circuit can adapt to different operating modes, but chattering at the power supply terminal causes unintentional mode setting and initialization failure
Solution Approach 1:
The initialization control circuit is designed to preemptively ignore function control signals during the critical initialization period after battery installation. By establishing a time-based exclusion window before normal operation begins, the circuit prevents chattering from affecting initialization, while still allowing mode selection functionality to operate normally once initialization is complete.
Solution Approach 2:
A time-based control mechanism acts as an intermediary between the function control signals and the initialization control circuit. This intermediary temporarily blocks function control signals during the initialization period, preventing them from interfering with the initialization process, while allowing them to pass through normally after initialization is complete.
2Loss of time
If the initialization circuit operates during chattering, then initialization can be completed quickly, but incorrect operating modes are set due to unstable power supply
Solution Approach 1:
The system performs preliminary timing measurement to determine the duration of power supply chattering after battery installation. Based on this measurement, the initialization control circuit establishes an exclusion window that prevents function control signals from being processed during the unstable period, ensuring accurate mode setting before normal operation begins.
Solution Approach 2:
The initialization control circuit continuously monitors the power supply stability and uses feedback from the elapsed time since battery installation to determine when to start accepting function control signals. This feedback mechanism ensures that initialization only proceeds when power supply conditions are stable, preventing incorrect mode setting.
3Ease of operation
If the circuit accepts function control signals immediately after battery installation, then mode selection is responsive, but power supply chattering causes initialization failure
Solution Approach 1:
The system preemptively determines the duration of power supply chattering by measuring the elapsed time after battery installation. Based on this preliminary assessment, the initialization control circuit establishes a temporary exclusion window that blocks function control signals during the unstable period, ensuring reliable initialization while maintaining responsive mode selection afterward.
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
This configuration ensures that internal circuits are reliably initialized and set to a specific operating mode, improving the reliability of electronic timepieces by preventing incorrect mode settings and reducing current consumption.
Implementation Method 1
The oscillator circuit 11 causes the crystal oscillator, which is the reference signal source, to oscillate at high frequency, and outputs a 32768-Hz clock signal produced by the high frequency oscillation
Implementation Method 2
When field effect transistor N1 is on and field effect transistor N2 is off, capacitor C1 is charged. When field effect transistor N1 is off and field effect transistor N2 is on, the charge stored in capacitor C1 is charged to capacitor C2.
Data Source
AI summary
Provided are an electronic circuit and electronic timepiece that can initialize internal circuits even if chattering occurs when a battery is installed. In the electronic circuit, when the initialization state hold signal is input, the initialization control circuit continues outputting the initialization control signal at the first level until the clock signal is output; and when the initialization state hold signal is input and the clock signal is output, outputs the initialization control signal at the second level cancelling the initialization process to the initialization circuit.