Power Module PFC Terminal Segmentation for Noise Suppression
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Solution Overview
Problem
The existing power modules with PFC functions experience significant noise generation between semiconductor switching elements due to high common impedance, leading to oscillation phenomena during high-speed switching, which affects the reliability and efficiency of the power module.
Innovation Solution
The power module design includes semiconductor switching elements connected through first diodes to independently provided terminals, reducing common impedance and suppressing noise by altering the interconnect routing within the package, thereby minimizing oscillation and noise between the gates and emitters of the semiconductor switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semiconductor switching elements in two phases share one terminal (P terminal), then device complexity is reduced, but common impedance increases causing serious oscillation and noise
Solution Approach 1:
The patent divides the previously shared terminal into two independent terminals (P1 and P2), one for each phase. This segmentation eliminates the common impedance path that caused oscillation and noise, while maintaining relatively simple device structure. Each phase has its own dedicated terminal connection, preventing the harmful interaction between phases.
2Ease of manufacture
If semiconductor switching elements share a common terminal, then manufacturing is simplified, but noise between gates and emitters increases during high-speed switching
Solution Approach 1:
The patent segments the terminal connections so that each semiconductor switching element has its own independent terminal (P1 for first phase, P2 for second phase). This eliminates the common impedance that amplified switching noise during high-speed operation, while the overall manufacturing process remains straightforward with standard connection techniques.
3Object-affected harmful factors
If independent terminals are provided for each phase, then common impedance is reduced and noise is suppressed, but device complexity increases
Solution Approach 1:
The patent implements segmentation by providing separate terminals P1 and P2 for the two phases, which effectively reduces common impedance and suppresses noise. The increased complexity is minimal and justified by the significant improvement in noise performance and oscillation suppression.
4Volume of moving object
If semiconductor switching elements share a terminal, then the structure is compact, but oscillation phenomenon increases during high-speed switching
Solution Approach 1:
The patent segments the terminal connections into independent P1 and P2 terminals for each phase, which eliminates the oscillation phenomenon during high-speed switching by removing the common impedance path. The module maintains a compact structure despite the separate terminals, as the segmentation is implemented at the connection level rather than requiring separate physical modules.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces noise and oscillation phenomena, enhancing the driving reliability and efficiency of the power module by minimizing common impedance and surge voltages, thus improving the overall performance of the power module.
Implementation Method 1
first diodes in a pair connected to the semiconductor switching elements in a pair, the first diodes forming a reverse-conducting element
Implementation Method 2
second diodes in a pair connected to the semiconductor switching elements in a pair, the second diodes having a rectifying function
Data Source
AI summary
A power module is a power module having a PFC (power factor correction) function. The power module includes: IGBTs in a pair; first diodes in a pair connected to the IGBTs in a pair, the first diodes forming a reverse-conducting element; and second diodes in a pair connected to the IGBTs in a pair, the second diodes having a rectifying function. The power module further includes a driving IC that drives the IGBTs in a pair, and P terminals in a pair provided independently of each other. The P terminals are connected to one ends of the first diodes in a pair, respectively, the one ends being opposite to the other ends of the first diodes to which the IGBTs in a pair are connected.