Watch Motor Control Circuit With Adaptive Current Sampling
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Solution Overview
Problem
Existing watch motor control circuits face high power consumption due to the need for rapid sampling processing during high-speed motor operation, which increases energy usage and potentially leads to detection errors.
Innovation Solution
A watch motor control circuit that includes a driver with ON and OFF states, current detectors for threshold monitoring, a polarity switching controller, and a sampling cycle controller that adjusts the sampling cycle in two stages based on detected conditions to optimize current detection and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sampling processing is performed constantly at high speed to detect current values during motor operation, then detection precision is improved, but power consumption of the motor control circuit increases
Solution Approach 1:
The sampling cycle is dynamically adjusted based on motor operation state. When the motor is driven at high speed, the sampling cycle is shortened to improve detection precision. When the motor operates at low speed or is stationary, the sampling cycle is extended to reduce power consumption. This dynamic adaptation resolves the contradiction between detection precision and power consumption.
Solution Approach 2:
The sampling cycle parameter is changed according to motor speed conditions. The control circuit switches between a first sampling cycle (shorter) for high-speed operation and a second sampling cycle (longer) for low-speed or stationary operation. This parameter change allows the system to optimize both detection precision and power consumption based on operational requirements.
2Measurement precision
If the sampling cycle is shortened to improve detection accuracy during high-speed motor operation, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The control circuit dynamically adjusts the sampling cycle based on detected motor speed. During high-speed operation, it uses a shorter first sampling cycle to ensure accurate current detection. During low-speed or stationary periods, it switches to a longer second sampling cycle to minimize power consumption of the control circuit, resolving the contradiction between detection accuracy and energy usage.
Solution Approach 2:
The system implements periodic sampling with variable periods. Instead of continuous sampling, it uses intermittent sampling at two different cycles depending on motor state. This periodic action with adaptive timing reduces overall power consumption while maintaining detection accuracy when needed.
3Reliability
If constant high-speed sampling is performed to maintain accurate motor control, then control precision is improved, but energy efficiency deteriorates
Solution Approach 1:
The sampling cycle is dynamically adapted to motor operating conditions. During high-speed motor operation where accurate control is critical, the system uses a shorter sampling cycle to maintain control precision. During low-speed operation or when the motor is stationary, it extends the sampling cycle to reduce energy consumption, thus improving overall energy efficiency without sacrificing control accuracy when required.
Solution Approach 2:
The control system changes the sampling cycle parameter based on motor speed detection. It switches between a first sampling cycle for high-speed operation (maintaining control accuracy) and a second sampling cycle for low-speed operation (improving energy efficiency). This parameter adaptation resolves the contradiction between control reliability and energy loss.
Data Source
AI summary
An electronic watch includes a driver controlled to be in an ON state in which a drive current is supplied to a coil of a watch motor, and an OFF state in which the drive current is not supplied, a current detector that detects a current value flowing through the coil, a driver controller that controls the driver, a polarity switching controller that alternately switches a polarity of the drive current to a first polarity and a second polarity, a sampling controller that, at a sampling cycle, intermittently causes the current detector and the driver controller to operate, and a sampling cycle setting controller that detects a sampling cycle setting condition and changes the sampling cycle in at least two stages of a first cycle and a second cycle longer than the first cycle.