Driver Slope Regulation Circuit for EMC Emission Reduction
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Solution Overview
Problem
MOSFET devices experience difficulties in controlling transition times between on and off states, leading to undesirable fluctuations in voltage or current when multiple transistors are used, which result in electromagnetic compatibility (EMC) emissions and increased costs due to shielding requirements.
Innovation Solution
A circuit and method that includes drivers, monitor modules, and comparators to measure and adjust the slope times of drivers to match target slopes, reducing the need for extra circuit elements and minimizing EMC emissions by ensuring consistent voltage or current delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trimming components are added to control transition time, then transition time control is improved, but device complexity and cost increase
Solution Approach 1:
The system uses self-service by having the monitor modules continuously measure slope times and feed this information back to the regulators, which automatically adjust driver slopes without external intervention or complex trimming components. The system serves itself by using its own operational data to make real-time corrections.
Solution Approach 2:
The patent implements feedback by using monitor modules to measure slope times of drivers and feeding this information back to regulators. The regulators then compare measured slope times against target values and adjust driver slopes accordingly, creating a closed-loop control system that eliminates the need for complex trimming components.
2Power
If multiple transistors are used to provide output voltage or current, then output capability is improved, but voltage or current fluctuations increase due to differential transition times
Solution Approach 1:
The system applies dynamics by continuously monitoring and dynamically adjusting the slope times of multiple drivers in real-time. Rather than using fixed trimming components, the regulators dynamically modify driver characteristics based on measured performance, ensuring that multiple transistors operate with matched transition times and maintain stable output voltage or current.
Solution Approach 2:
The patent uses parameter changes by having regulators modify driver slope parameters based on feedback from monitor modules. The system changes operational parameters (slope times) of multiple drivers to match target values, ensuring synchronized transitions and eliminating voltage or current fluctuations caused by differential transition times.
3Object-affected harmful factors
If slope regulation is implemented, then EMC emissions are reduced, but measurement and control complexity increases
Solution Approach 1:
The system applies segmentation by dividing the slope regulation function into separate specialized modules: monitor modules that measure slope times, comparators that compare measured values against targets, and regulators that adjust driver slopes. This segmentation makes the complex measurement and control task manageable by distributing functionality across multiple simple, focused components.
Solution Approach 2:
The patent uses intermediaries by introducing monitor modules as mediators between drivers and regulators. These monitor modules simplify the measurement task by directly measuring slope times and providing clean feedback signals to regulators, making the overall control system easier to implement despite the complexity of slope regulation itself.
Data Source
AI summary
A circuit includes a first driver, a second driver, and one or more monitor modules coupled to the first or second driver to measure slope times of the first or second driver. The circuit further includes a comparator coupled to the one or more monitor modules to compare the slope times of the first and second drivers. The circuit further includes one or more regulators coupled to the comparator and the first or second driver to regulate a slope of the first or second driver, based on output of the comparator, at most once per pulse cycle until the slope of the first or second driver reaches a target slope.