Electronic Watch Motor Drive Polarity Synchronization
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Solution Overview
Problem
Existing electronic watches face challenges in setting the pulse motor drive means to be suitable for both normal and fast-forward hand operations, leading to issues with motor drive signal polarity matching and hand indication accuracy.
Innovation Solution
The method involves a motor driven by two polarity storage devices and driving circuits, with a control device switching between control processing modes to match and rewrite polarity information, ensuring accurate motor drive signals are output regardless of the operational mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same pulse motor drive means is used during normal hand operation and fast-forward, then device complexity is reduced, but it becomes difficult to set the drive means to be suitable for both operations
Solution Approach 1:
The motor drive control means is segmented into two separate control circuits: a first control circuit for normal hand operation and a second control circuit for fast-forward operation. Each circuit has its own polarity storage device and driving circuit, allowing independent optimization for each operation type without compromising the other.
Solution Approach 2:
The system dynamically switches between the first and second control circuits based on the operational mode. The control device determines which circuit to activate based on whether normal operation or fast-forward is required, enabling the system to adapt its drive characteristics to match the current operational demands.
2Reliability
If polarity information is not synchronized between storage devices when switching control modes, then hand indication accuracy deteriorates due to polarity misalignment
Solution Approach 1:
When switching between control circuits, the system implements feedback by having the active control circuit transmit its polarity information to the standby control circuit. The standby circuit uses this feedback to synchronize its polarity storage device, ensuring that both circuits have consistent polarity information and the motor operates in the correct direction after mode switching.
Solution Approach 2:
Before the control circuit switch becomes effective, the polarity information is pre-synchronized from the active circuit to the standby circuit. This preliminary action ensures that when the switch occurs, both circuits already have matching polarity information, preventing any hand indication errors during or after the transition.
3Area of stationary object
If a single driving circuit is used for both normal and fast-forward operations, then circuit size is reduced, but optimization for specific operations becomes difficult
Solution Approach 1:
The driving circuit is segmented into a first driving circuit optimized for normal hand operation and a second driving circuit optimized for fast-forward operation. Each driving circuit can be independently designed and manufactured with characteristics best suited for its specific operation type, improving overall system performance while maintaining a compact footprint through shared components.
Solution Approach 2:
The motor itself serves as a universal component that can operate under different drive conditions. By using the same motor for both normal and fast-forward operations but controlling it through different optimized circuits, the system achieves operation-specific optimization without requiring duplicate motors or excessively large circuitry.
Data Source
AI summary
A method for controlling an electronic watch is a method for controlling an electronic watch having a control device, the method comprising: when performing a first control processing, operating a first driving circuit to output a first motor drive signal, and rewriting a first polarity information in accordance with an output of the first motor drive signal, when ending output of the first motor drive signal, matching a second polarity information with the first polarity information, when performing a second control processing, operating a second driving circuit to output a second motor drive signal, and rewriting the second polarity information in accordance with an output of the second motor drive signal, and when ending output of the second motor drive signal, matching the first polarity information with the second polarity information.