Motor Driving Inverter Module Segmentation for Thermal and Shoot-Through Control
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Solution Overview
Problem
Conventional motor driving inverter circuits face issues with high thermal interaction, narrow safe operation area, and the 'shoot-through' phenomenon due to limited current detection capabilities, particularly when dealing with three-phase motors.
Innovation Solution
The implementation of a motor driving inverter circuit module with three high-voltage drivers and six transistors, integrated into separate chips, along with three current detection terminals, allows for accurate detection and prevention of shoot-through by generating phase-specific driving signals and detecting currents for each phase of the three-phase motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional one-chip inverter circuit is used, then device integration is achieved, but thermal interaction increases and safe operation area narrows
Solution Approach 1:
The inverter circuit is divided into separate functional modules: upper arm transistor, lower arm transistor, and high voltage driver, each integrated on independent chips. This segmentation reduces thermal interaction between components while maintaining system integration, thereby expanding the safe operation area without sacrificing device complexity benefits
2Device complexity
If conventional two-terminal detection is used, then device simplicity is maintained, but current detection accuracy decreases
Solution Approach 1:
The detection system uses three dedicated current detection terminals (Nu, Nv, Nw) corresponding to each phase, providing localized and accurate current measurement for each phase. This local quality approach ensures precise current detection while maintaining reasonable device complexity
3Speed
If high dV/dt operation is used, then switching speed improves, but shoot-through phenomenon occurs
Solution Approach 1:
The circuit incorporates preliminary protective actions through dedicated current detection terminals and control logic that monitor phase currents before shoot-through can occur. The separate integration of transistors and drivers allows for controlled switching sequences that prevent simultaneous conduction while maintaining high switching speeds
Solution Approach 2:
The current detection terminals provide real-time feedback on phase currents, enabling the control system to detect and prevent shoot-through conditions. This feedback mechanism allows high dV/dt operation while maintaining reliability by immediately responding to abnormal current conditions
Data Source
AI summary
The motor driving inverter circuit module includes first-phase, second-phase, and third-phase high voltage drivers generating first-phase, second-phase, and third-phase upper arm and lower arm driving signals in response to input signals for driving the first-phase, second-phase, and third-phase upper and lower arms and a first-phase, second-phase, and third-phase upper arm and lower arm transistors, generating first-phase, second-phase, and third-phase motor driving output signals in response to the first-phase, second-phase, and third-phase upper arm and lower arm driving signals of the first-phase, second-phase, and third-phase high voltage drivers. The first-phase, second-phase, and third-phase high voltage drivers and the first-phase, second-phase, and third-phase upper arm and lower arm transistors are respectively integrated into separate chips.