Multimode DC-DC Converter Adaptive Filter for Transient Response
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Solution Overview
Problem
Existing switched-mode power converters are inefficient at low power levels due to fixed overhead costs and cannot rapidly adjust supply voltage for high-speed wireless signals, leading to distorted symbols and increased Error Vector Magnitude (EVM) in transmitted signals.
Innovation Solution
A multiple mode switching voltage regulator that includes a series switch element, a shunt switch element, and a switched output filter with capacitors, allowing for adaptive operation in high-bandwidth envelope tracking mode and low-bandwidth pulse skipping mode, using a current source to charge and disconnect capacitors to minimize voltage disturbances and optimize power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a low switching frequency converter is used, then switching losses are reduced, but the converter cannot provide rapid response for envelope tracking applications
Solution Approach 1:
The patent employs a dynamically configurable output filter that can change its capacitance value in response to operating conditions. During envelope tracking when rapid response is needed, the filter uses a lower capacitance value that allows faster voltage changes. During steady-state operation, the filter switches to a higher capacitance value to suppress ripple and reduce switching losses, thus achieving both fast response and high efficiency at different times
2Stability of the object's composition
If the output filter capacitance is increased to reduce voltage ripple, then voltage regulation stability is improved, but the transient response speed decreases
Solution Approach 1:
The patent implements a dual-mode output filter that can switch between a first capacitance value for high stability (ripple suppression) and a second capacitance value for fast transient response. The controller monitors operating conditions and automatically configures the appropriate capacitance value, achieving both voltage regulation stability and fast transient response at different operating points without compromise
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 regulator achieves efficient voltage regulation across a wide range of power levels, minimizing output voltage disturbances and improving system efficiency by adaptively switching between modes to match operating conditions, thereby reducing spurious signals and EVM.
Implementation Method 1
the switched output filter includes a plurality of capacitors that are selectively included within the switched output filter
Data Source
AI summary
Embodiments for at methods, apparatus and systems for operating a voltage regulator are disclosed. One apparatus includes a switching voltage regulator, wherein the switching voltage regulator includes a series switch element, a shunt switch element, a switching controller and a switched output filter. The switching controller is configured to generate a switching voltage through controlled closing and opening of the series switch element and the shunt switch element. The switched output filter filters the switching voltage and generates a regulated output voltage, wherein the switched output filter includes a plurality of capacitors that are selectively included within the switched output filter.