Remote VRM Capacitance Loop for High Current Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power distribution systems, placing a DC-DC converter on a separate field replaceable unit introduces inductive impedance, leading to electromagnetic interference and noise, which is difficult to mitigate with existing decoupling capacitors, especially in high-current, low-voltage applications, and results in increased costs due to the need for significant capacitance on both the converter and load board.
Innovation Solution
A remote voltage regulator module (VRM) with a first capacitance on the converter and a second, significantly greater capacitance on the load board forms a loop with bus bars, characterizing a second-order or less transfer function to suppress ripple frequency noise without providing excessive decoupling, thus maintaining stability and reducing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC-DC converter is placed on a separate field replaceable unit from the load board, then reliability is improved through independent replacement capability, but inductive impedance increases leading to electromagnetic interference and noise
Solution Approach 1:
The system is divided into separate field replaceable units (converter module and load board) that can be independently replaced, while each unit maintains appropriate capacitance for its specific function. This segmentation allows reliability improvement through modular replacement while managing EMI through distributed capacitance placement.
Solution Approach 2:
Capacitance elements serve as intermediary components between the converter module and load board, providing local energy storage and filtering that reduces the impact of inductive impedance in the connection between separate units, thereby mitigating electromagnetic interference.
2Object-affected harmful factors
If significant capacitance is implemented on both the DC-DC converter and load board to counter inductance, then impedance is reduced and power stability is improved, but device complexity and cost increase due to additional poles and zeros in the transfer function
Solution Approach 1:
Different capacitance values are assigned to different locations based on local requirements: a first capacitance value on the converter module for ripple suppression and a second capacitance value on the load board for impedance compensation. This local optimization reduces overall complexity compared to uniform capacitance distribution.
Solution Approach 2:
Rather than providing excessive capacitance throughout the entire system, the invention applies partial capacitance at strategic locations - just enough on the converter module to suppress ripple and just enough on the load board to compensate for inductance, avoiding the complexity of oversized capacitance networks.
3Stability of the object's composition
If large capacitance is implemented near the DC-DC converter to counter FRU inductance, then output stability is improved, but additional capacitance is required at the load board to counter connector and bus bar inductance, increasing overall system complexity
Solution Approach 1:
The capacitance function is segmented into two distinct roles: a first capacitance on the converter module for output stability and ripple suppression, and a second capacitance on the load board for impedance compensation. This clear segmentation simplifies the overall design compared to a monolithic capacitance approach.
Solution Approach 2:
The invention changes the capacitance parameter distribution across the system - using a first capacitance value near the converter for stability and a second capacitance value at the load for impedance management. This parameter optimization reduces the total capacitance required compared to traditional approaches.
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 configuration effectively suppresses ripple frequency noise and maintains a stable power output while minimizing impedance and cost by limiting capacitance on the VRM to only what is necessary for ripple suppression, ensuring a smooth and stable voltage supply to the load board.
Implementation Method 1
The VRM includes a first capacitance of a first amount, while the load board includes a second capacitance of a second amount
Data Source
AI summary
A remote voltage regulator module (VRM) for high-current, low voltage applications. In one embodiment, an electronic system includes a VRM configured to provide a DC output voltage. The VRM is coupled to a load board via a first bus bar and a second bus bar. The VRM includes a first capacitance of a first amount, while the load board includes a second capacitance of a second amount. A loop between the VRM and the load board is formed by the first and second bus bars and first and second capacitances. The loop is characterized by a transfer function that is second order or less.