PWM Duty Cycle Error Detection for Motor Controller Gate Drives
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Solution Overview
Problem
Existing techniques for controlling vehicle systems using pulse-width modulation (PWM) signals lack effective methods for detecting duty cycle errors, which can lead to unintended power supply issues in vehicle components.
Innovation Solution
A system and method for detecting PWM duty cycle errors by comparing the duty cycle of a PWM signal with a corresponding PWM command, and triggering a safe state at the gate drive of a motor controller if an error is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PWM signals are used to control vehicle components, then power supply control is improved, but duty cycle errors can cause unintended power supply issues
Solution Approach 1:
The system continuously monitors the actual PWM signal duty cycle and compares it with the commanded duty cycle. When a discrepancy is detected, the system triggers a safe state to prevent unintended power supply issues, thereby maintaining reliability while preserving the ease of operation of PWM control
Solution Approach 2:
The patent implements preliminary detection and comparison of PWM duty cycles before the error can cause harmful effects. By continuously monitoring and comparing duty cycles in advance, the system prevents unintended power supply issues before they occur
2Measurement precision
If duty cycle comparison detection is implemented, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system uses the existing PWM command signal and PWM output signal directly for comparison without requiring external measurement equipment. The controller itself performs the duty cycle comparison, making the detection system self-contained and avoiding additional complex hardware while maintaining high detection accuracy
Data Source
AI summary
Techniques for detecting pulse-width modulation (PWM) duty cycle errors are disclosed. The techniques include receiving a PWM signal for output to a gate drive of a motor controller and detecting a first duty cycle error associated with the PWM signal based on a comparison of the PWM signal with a corresponding PWM command. The techniques further include triggering, in response to detecting the first duty cycle error, a safe state at the gate drive of the motor controller.