Motor Driver Output Mode Selection Circuit for Abnormal Torque Signals
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Solution Overview
Problem
Existing motor driver ICs lack the ability to allow users to intentionally set a motor to full-speed or stop rotation status when the torque instruction input terminal experiences abnormalities, such as short-circuits, leading to unintended motor actions.
Innovation Solution
A motor driver with an output mode selection circuit that sends indications to the control portion to adjust the motor's action status, allowing selection between stop and full-speed rotation modes when an abnormality occurs, using logic levels to determine the desired motor response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torque instruction input terminal lacks abnormal protection function, then the motor driver structure remains simple, but the motor cannot respond according to user intention when abnormality occurs
Solution Approach 1:
The patent introduces an output mode selection circuit as an intermediary component between the torque instruction input terminal and the control portion. This circuit includes abnormality detection means to detect abnormalities in the torque instruction input terminal, and output mode determination means to determine the motor's action status based on the detected abnormality and a stored output mode. This intermediary structure enables reliable motor response under abnormal conditions without significantly complicating the overall motor driver architecture.
2Adaptability or versatility
If the motor driver responds automatically to abnormality without user selection, then the response speed is fast, but the motor cannot adapt to different application requirements
Solution Approach 1:
The patent applies local quality by making the output mode determination localized and configurable. The output mode determination means stores different output modes (such as full-speed rotation, stop, or other action statuses) and selects the appropriate mode based on the detected abnormality type. This allows different parts of the system to have different response characteristics - for example, a blower motor can be configured to stop upon abnormality while a cooling fan motor can be configured to maintain full-speed rotation, thereby adapting to different application requirements without significantly increasing overall system complexity.
Data Source
AI summary
A motor driver includes a control portion, for performing variable control on a torque or rotation speed of a motor through a control signal; and an output mode selection circuit, for sending an indication to the control portion when the control signal is abnormal, so that the motor enters an action status corresponding to a selection signal.