Integrated Circuit Noise Isolation for Power Modules
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Solution Overview
Problem
In intelligent power modules, noise generated during the switching of semiconductor chips can affect the voltage detection of diodes in other chips, leading to inaccurate temperature detection and inappropriate driving capabilities, which can prevent the switching devices from operating effectively.
Innovation Solution
The integrated circuit includes a signal output circuit to generate timing signals for switching devices, sample hold circuits to hold voltage signals corresponding to diode temperatures, and control circuits to adjust driving capabilities based on these signals, reducing noise effects by delaying pulse generation and using pulse widths shorter than switching times to minimize noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple semiconductor chips are provided for power conversion, then power conversion capability is improved, but noise from one chip affects voltage detection in other chips
Solution Approach 1:
The patent divides the system into independent detection channels for each semiconductor chip, with separate hold circuits and control circuits for each chip. This segmentation isolates the voltage detection and holding functions for each chip, preventing noise from one chip from affecting the voltage detection of other chips while maintaining multi-chip power conversion capability.
Solution Approach 2:
The hold circuit performs preliminary action by holding the voltage signal at the moment when switching noise is generated. By capturing and maintaining the voltage value before noise contamination occurs, the system ensures accurate temperature detection despite the presence of multiple switching chips operating simultaneously.
2Measurement precision
If voltage holding time is extended to capture accurate temperature, then temperature detection accuracy is improved, but noise from switching operations affects the held voltage
Solution Approach 1:
The hold circuit captures and holds the voltage signal at the precise moment before switching noise occurs. By performing the voltage capture action preliminarily, before the switching operation generates noise, the system achieves accurate temperature detection without the held voltage being contaminated by subsequent noise.
Solution Approach 2:
The system rushes through the voltage capture process during the noise-free window between switching operations. The hold circuit quickly acquires and maintains the voltage value during the brief period when no switching noise is present, then continues holding this value through the switching operation without being affected by the noise.
Data Source
AI summary
An integrated circuit includes a signal output circuit configured to output a timing signal indicating first and second timings of respectively switching first and second switching devices, first and second hold circuits respectively configured to receive first and second voltages corresponding to temperatures of the first and second switching devices, hold the first and second voltages for first and second time periods, and output the received first and second voltages in response to the first and second time periods having elapsed, and first and second control circuits respectively configured to control switching of the first and second switching devices with first and second driving capabilities corresponding to the temperatures of the first and second switching devices, based on the first and second voltages outputted from the first and second hold circuits and first and second driving signals for driving the first and second switching device.