IPM Driving Circuit With Cooperative Temperature Threshold Control
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Solution Overview
Problem
In systems with multiple Intelligent Power Modules (IPMs), inconsistencies in temperature sensing due to differences in threshold voltage and comparator offset voltage lead to inconsistent comparator behavior, causing abnormal system control.
Innovation Solution
A power driving circuit and driving system that utilize differentiated threshold voltage settings for each IPM, with a cooperative processing module to generate a cooperative control signal, and a temperature sensing module to sense temperature variations, ensuring synchronous responses across all IPMs by superimposing a sensing increment with the sensing signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple IPMs use the same detection voltage for temperature sensing, then the system structure is simplified and ease of manufacture is improved, but differences in threshold voltage and comparator offset voltage cause inconsistent comparator behavior and reduce system reliability
Solution Approach 1:
The patent applies local quality by providing each IPM with its own dedicated threshold voltage and comparator offset voltage settings, allowing each module to be calibrated independently. This ensures that each IPM's temperature sensing and protection functions operate consistently according to its specific characteristics, resolving the reliability issues caused by using a common detection voltage across multiple IPMs.
Solution Approach 2:
The patent implements parameter changes by adjusting and optimizing the threshold voltage and comparator offset voltage for each IPM individually. Through these parameter adjustments, the patent achieves consistent comparator behavior across multiple IPMs, eliminating the inconsistency problems that arise from using identical detection voltages while maintaining ease of manufacture.
2Device complexity
If traditional temperature sensing is used without cooperative control, then the device complexity is reduced, but inconsistent responses among multiple IPMs occur under high temperature conditions
Solution Approach 1:
The patent applies merging by integrating a cooperative control mechanism that combines the temperature sensing outputs from multiple IPMs. The control unit receives temperature information from each IPM, processes it collectively, and generates coordinated protection signals. This merging approach ensures that all IPMs respond consistently to high temperature conditions while maintaining relatively simple device architecture.
Solution Approach 2:
The patent implements feedback by creating a closed-loop control system where the temperature sensing results from multiple IPMs are fed back to a central control unit. The control unit processes this feedback information and adjusts the protection signals accordingly, ensuring that all IPMs respond in a coordinated manner to temperature variations, thereby improving reliability without significantly increasing device complexity.
3Reliability
If differentiated threshold voltage settings are implemented for each IPM, then consistent comparator behavior is achieved and reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing each IPM with its own dedicated threshold voltage and comparator offset voltage settings, allowing each module to be calibrated independently. This ensures that each IPM's temperature sensing and protection functions operate consistently according to its specific characteristics, resolving the reliability issues caused by using a common detection voltage across multiple IPMs.
Solution Approach 2:
The patent implements universality by designing a modular architecture where each IPM can be independently configured with its own threshold voltage settings while sharing the same overall system framework. This multi-functionality approach allows the system to accommodate differentiated voltage settings for each IPM without requiring completely separate control circuits, thereby improving reliability while controlling the increase in device complexity.
Data Source
AI summary
A power driving circuit including a high/low-side driving module, a cooperative processing module, and a temperature sensing module are provided. The high/low-side driving module is turned on or off based on a cooperative control signal, and generate a high-side driving signal based on a high-side input signal and generate a low-side driving signal based on a low-side input signal when the high/low-side driving module is turned on. The cooperative processing module compares an input voltage and a threshold voltage and generates the cooperative control signal. The threshold voltage is switched between a first voltage and a second voltage based on the cooperative control signal. The temperature sensing module connects an output terminal of the cooperative processing module, and senses a temperature variation, generates a sensing signal, generates a sensing increment, and controls whether the sensing increment is superimposedly output with the sensing signal.