Temperature Compensation Circuit for Accurate DESAT Detection
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Solution Overview
Problem
Semiconductor devices connected to power devices face challenges in effectively protecting against overcurrent, particularly during transitions in load operation, which can lead to power device failure.
Innovation Solution
A temperature compensation circuit is integrated with a correction circuit and a voltage supply circuit to adjust the threshold voltage based on the temperature and voltage of the power device, enabling precise DESAT detection and timely shutdown to prevent overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold voltage is used for DESAT detection, then the circuit is simple, but the detection accuracy deteriorates with temperature and voltage variations
Solution Approach 1:
The patent implements dynamic threshold voltage adjustment by introducing a compensation circuit that modifies the reference voltage based on temperature and control terminal voltage conditions. The threshold voltage transitions from a fixed value to a dynamically adjustable value that adapts to operating conditions, resolving the contradiction between circuit simplicity and detection accuracy.
Solution Approach 2:
The patent changes the parameter of threshold voltage from constant to variable by incorporating temperature compensation and voltage compensation mechanisms. The compensation circuit alters the reference voltage parameter in response to temperature changes and control terminal voltage variations, thereby maintaining accurate DESAT detection across different operating conditions.
2Measurement precision
If temperature compensation is added to adjust threshold voltage, then DESAT detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent introduces a compensation circuit as an intermediary component that mediates between the temperature sensor and the voltage supply circuit. This intermediary processes temperature information and generates appropriate compensation voltages, achieving accurate temperature compensation while keeping the overall circuit structure manageable through functional decomposition.
Solution Approach 2:
The patent segments the voltage supply function into multiple independent parts: a base voltage supply circuit and a compensation circuit. The compensation circuit is further divided into temperature compensation and voltage compensation sub-circuits. This segmentation allows each component to perform a specific function, improving overall system accuracy while maintaining modularity and manageable complexity.
3Reliability
If voltage compensation is added based on control terminal voltage, then protection reliability improves, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the compensation circuit continuously monitors the control terminal voltage and adjusts the reference voltage accordingly. This feedback loop ensures that the DESAT detection threshold adapts to real-time voltage conditions, significantly improving protection reliability. The feedback-based approach maintains reliability while avoiding the need for complex open-loop compensation schemes.
Data Source
AI summary
According to one embodiment, a temperature compensation circuit that includes a correction circuit and a voltage supply circuit is provided. The correction circuit includes a first input node, a second input node, and an output node. The first input node is connected to a temperature sensor near a power device. The second input node is connected to a control terminal of the power device. The voltage supply circuit includes an input node and an output node. The input node is connected to the output node of the correction circuit. The output node is connected to a second input node of a comparator circuit. The comparator circuit includes a first input node and the second input node. The first input node is connected to one end of the power device.