Current Regulation Circuit for Brushless Motor Pulse Signals
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Solution Overview
Problem
Conventional current regulation circuits for pulse signals in brushless motor control systems generate unnecessary electromagnetic radiation and suffer from connector contact quality deterioration due to current amplitude issues.
Innovation Solution
A current regulation circuit with a current blocking circuit and regulation part that adjusts current amplitude levels by varying the current blocking rate based on power source voltage, using a microcomputer to control the pull-up resistor value, thereby reducing electromagnetic radiation and maintaining connector quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current amplitude level is increased to maintain connector contact quality, then the quality of the connector contact is maintained, but unnecessary electromagnetic wave radiation increases
Solution Approach 1:
The patent applies dynamics by making the current amplitude level variable rather than fixed. The control circuit dynamically adjusts the current amplitude based on the operational state and voltage conditions, switching between different amplitude levels to optimize both connector reliability and electromagnetic radiation reduction at different operating points
Solution Approach 2:
The patent changes the parameter of current amplitude level from a constant value to a variable parameter that can be adjusted based on voltage conditions. By monitoring voltage and switching between predetermined current amplitude levels, the system adapts to changing conditions to maintain connector quality while reducing electromagnetic radiation when high current is not necessary
2Object-generated harmful factors
If the current amplitude level is decreased to reduce electromagnetic wave radiation, then electromagnetic wave radiation is reduced, but the quality of the connector contact deteriorates
Solution Approach 1:
The system dynamically adjusts current amplitude based on real-time voltage monitoring. When voltage drops indicate connector contact issues, the system automatically increases current amplitude to maintain reliable contact, preventing deterioration while still allowing for reduced radiation during normal operation
Solution Approach 2:
The control circuit implements feedback by monitoring voltage levels and using this information to adjust current amplitude. The voltage detection provides continuous feedback about connector contact quality, enabling the system to respond by adjusting current levels to maintain reliability while optimizing radiation emission
Data Source
AI summary
A current is supplied from a power source voltage supply node of a power source voltage to an open-collector of a transistor through a current blocking circuit, connectors and a signal transmission line. A microcomputer regulates a resistance value of a pull-up resistor by switching over an on/off state of a switch circuit in accordance with the power source voltage detected by a power source voltage detection circuit. The microcomputer thus regulates a current blocking rate of the current blocking circuit.