Motor Drive Circuit Locking Protection Prohibition
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Solution Overview
Problem
Existing motor drive circuits face issues where a motor may be incorrectly judged as locked due to low power supply voltage during startup, leading to premature activation of the locking protection circuit, which can result in unnecessary shutdown of the drive current and potential damage.
Innovation Solution
A motor drive circuit with a prohibition circuit that prevents the locking protection circuit from stopping the drive current supply when the power supply voltage is below a certain threshold, ensuring continuous current supply during voltage stabilization and preventing misjudgment of motor lockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the power supply voltage rises slowly during startup, then voltage stabilization is achieved, but the time period for motor rotation detection is extended
Solution Approach 1:
The prohibition circuit is activated in advance during power supply stabilization to prevent the locking protection circuit from operating. By establishing this protective measure before the problem occurs, the circuit avoids false shutdowns during the voltage rise period while allowing normal protection function when voltage is stable.
2Reliability
If the locking protection circuit operates during low power supply voltage, then protection against lockage is provided, but unnecessary drive current shutdown occurs
Solution Approach 1:
The prohibition circuit acts as an intermediary between the power supply voltage and the locking protection circuit. It mediates the interaction by blocking the locking protection circuit's operation during low voltage conditions, preventing false shutdowns while allowing normal protection function when voltage is stable.
Solution Approach 2:
The prohibition circuit changes the operational parameter of the locking protection circuit by disabling it during low voltage conditions. This parameter change (from active to inactive state) prevents unnecessary shutdowns during power supply stabilization while maintaining protection functionality when voltage is adequate.
Data Source
AI summary
A motor drive circuit comprising: a drive circuit configured to supply a drive current to a drive coil of a motor; a control circuit configured to control an operation of the drive circuit; a locking protection circuit configured to control an operation of the control circuit so that the drive circuit stops supplying the drive current to the drive coil, if a rotation signal, indicating rotation of the motor, is not generated during a predetermined time period although the drive circuit is supplying the drive current to the drive coil; and a prohibition circuit configured to prohibit the locking protection circuit from controlling the control circuit.