Conductive Plate Reduces Parasitic Inductance in IC Power Supply
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Solution Overview
Problem
Conventional switched-mode power supply circuits are limited by parasitic loop inductance, which restricts switching frequency and efficiency due to the layout-dependent design and component configurations, necessitating redesign for different packages and close component arrangements.
Innovation Solution
An integrated circuit package with a conductive plate positioned over a main current loop formed by transistors and a capacitor, using insulator layers to reduce parasitic loop inductance through electromagnetic induction without carrying current in the main loop, thereby decreasing loop inductance and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional switched-mode power supply circuits are used with standard layout designs, then the circuit can be implemented with standard components and procedures, but the parasitic loop inductance is high which limits switching frequency and efficiency
Solution Approach 1:
A conductive plate is introduced as an intermediary element between the power supply circuit components. This plate serves as a mediator that provides an alternative current path, reducing the parasitic inductance of the critical loop without requiring redesign of the standard layout. The conductive plate is positioned to be electromagnetically coupled with the critical current loop, allowing it to function as a parasitic inductance reduction element while maintaining standard manufacturing procedures.
Solution Approach 2:
The invention changes the electromagnetic parameters of the critical loop by introducing a conductive plate with specific electrical conductivity. This alters the effective inductance of the loop by providing a parallel electromagnetic path, thereby reducing the parasitic loop inductance parameter without changing the physical layout or component arrangement of the power supply circuit.
2Loss of energy
If the area of the critical loop is minimized to reduce parasitic inductance, then the parasitic loop inductance is reduced, but the design becomes highly dependent on specific package and layout configurations requiring redesign for different packages
Solution Approach 1:
The conductive plate is designed as a universal component that can be applied across different package types and layouts. By positioning the conductive plate to be electromagnetically coupled with the critical current loop regardless of specific layout variations, it provides a package-independent solution for reducing parasitic inductance. The plate serves multiple functions: reducing parasitic inductance, improving EMI performance, and maintaining standard layout designs across different package configurations.
Solution Approach 2:
The conductive plate acts as an intermediary that decouples the parasitic inductance reduction function from the specific layout constraints. Instead of requiring the layout to be optimized for each package type, the conductive plate mediates between the critical current loop and the package variations, providing consistent parasitic inductance reduction across different configurations without requiring redesign.
3Productivity
If switching frequency is increased to improve power supply efficiency, then the power conversion efficiency improves, but the parasitic loop inductance causes increased EMI and noise which limits further frequency increases
Solution Approach 1:
The conductive plate serves as an intermediary that mitigates the harmful EMI and noise effects generated by high-frequency switching. By providing an alternative electromagnetic path parallel to the critical current loop, it reduces the loop inductance that would otherwise amplify EMI and noise at high switching frequencies, enabling higher frequency operation with reduced electromagnetic interference.
Solution Approach 2:
The invention changes the electromagnetic parameters of the critical loop by introducing the conductive plate, which reduces the effective parasitic inductance. This parameter change allows the circuit to operate at higher switching frequencies without the EMI and noise penalties that would normally limit frequency increases, thereby improving productivity while controlling harmful emissions.
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
The solution effectively reduces parasitic loop inductance, allowing for higher switching frequencies and improved efficiency in switched-mode power supplies by electromagnetically inducing current in the conductive plate without affecting the main current loop, thus overcoming layout-dependent limitations.
Implementation Method 1
a current can be electromagnetically induced in the conductive plate responsive to a change in current in the main current loop
Data Source
AI summary
A multi-layer integrated circuit package includes a switched-mode power supply circuit including a plurality of transistors which form part of a main current loop of the switched-mode power supply circuit. The plurality of transistors are arranged in one or more layers of the integrated circuit package. The package further includes a conductive plate arranged in a different layer of the integrated circuit package than the plurality of transistors. The conductive plate is in close enough proximity to at least part of the main current loop so that a current can be electromagnetically induced in the conductive plate responsive to a change in current in the main current loop.