MOTOR CONTROL CIRCUIT AND KEYBOARD ASSEMBLY HAVING SAME
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United States of America Patent
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N/A
Issued Date -
Jun 6, 2013
app pub date -
Aug 1, 2012
filing date -
Dec 2, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A motor control circuit for controlling rotation directions of a motor includes a primary power supply, a voltage monitor unit, a motor driving chip, a controller and a backup power supply. The backup power supply is constantly charged by the primary power supply when the primary power supply is in service. The voltage monitor unit is electronically connected to the primary power supply, and is configured for determining whether the primary power supply is in or out of service. The controller controls the motor driving chip to drive the motor to rotate in a first direction when the primary power supply is in service, and alternatively controlling the motor driving chip to drive the motor to rotate in a second direction reverse to the first direction when the primary power supply is out of service.
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