Electronic timepiece and motor control circuit
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United States of America Patent
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Oct 5, 2021
Grant Date -
Oct 1, 2020
app pub date -
Mar 24, 2020
filing date -
Mar 25, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic timepiece can prevent overrunning when driving a motor at a high speed. The electronic timepiece has a controller that controls a driver to an on state or an off state according to the current value detected by the current detector; a polarity changer that determines driving one step of the motor ended and changes the polarity of the drive current when the on time or off time is detected to meet a specific condition; and a drive period adjuster that sets the terminal supplying the drive current to the coil to a first state if the remaining drive step count is greater than the remaining count evaluation number, and if the remaining drive step count is less than or equal to the remaining count evaluation number, sets the terminal to a second state in which the brake force applied to the rotor is greater than in the first state.
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