Multi-Stage Power Supply Transient Response
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Solution Overview
Problem
Traditional electric power conversion devices face challenges in responding quickly to rapid changes in current demand due to the size of energy storage devices, which can lead to voltage fluctuations and unsatisfactory performance in high-performance electronic devices.
Innovation Solution
A multi-stage electric power conversion device configuration with a first stage and a second stage, where the second stage includes smaller energy storage devices and fast, low-voltage transistors to enhance transient response, and a current parking mechanism to manage inductor current, allowing for improved responsiveness to current transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If larger energy storage devices are used, then voltage stability is improved, but transient response speed deteriorates
Solution Approach 1:
The patent divides the single-stage power conversion device into two stages: a first stage with larger energy storage devices (inductor L1 and capacitor C1) for maintaining voltage stability, and a second stage with smaller energy storage devices (inductor L2 and capacitor C2) for providing fast transient response. This segmentation allows each stage to specialize in one function, resolving the contradiction between stability and speed.
2Power
If larger energy storage devices are used, then current supply capability is improved, but device size increases
Solution Approach 1:
The patent segments the energy storage function across two stages with different capacitor sizes. The first stage uses larger capacitors (C1) to provide bulk energy storage and maintain voltage stability during steady-state operation, while the second stage uses smaller capacitors (C2) that can respond quickly to transient demands. This segmentation allows the system to achieve high current supply capability without proportionally increasing overall device size.
Solution Approach 2:
The first stage operates in advance to establish stable voltage conditions and charge the larger energy storage devices, preparing the system for potential transient demands. By pre-charging C1 and maintaining it at a higher voltage level, the system ensures that when transients occur, the second stage can respond immediately without waiting for the first stage to react, thus improving both power capability and response time.
3Speed
If faster switching mechanisms are used, then transient response is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the switching function into two independent control loops: a first control loop for the first stage with slower switching characteristics suitable for steady-state regulation, and a second control loop for the second stage with faster switching characteristics optimized for transient response. This segmentation allows each control loop to be optimized independently, managing manufacturing complexity while achieving fast transient response.
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 multi-stage configuration enables faster response to current transients, reduced size and cost, and maintained voltage stability, addressing the limitations of single-stage devices by utilizing smaller energy storage devices and fast switching mechanisms.
Implementation Method 1
a first stage energy storage device and a second stage energy storage device
Implementation Method 2
a current parking switching mechanism operable to control an amount of inductor current provided to the second stage energy storage device
Data Source
AI summary
Embodiments are disclosed relating to an electric power conversion device and methods for controlling the operation thereof. One disclosed embodiment provides a multi-stage electric power conversion device including a first regulator stage including a first stage energy storage device and a second regulator stage including a second stage energy storage device, the second stage energy storage device being operatively coupled between the first stage energy storage device and the load. The device further includes a control mechanism operative to control (i) a first stage output voltage on a node between the first stage energy storage device and the second stage energy storage device and (ii) a second stage output voltage on a node between the second stage energy storage device and the load.