Switched-Capacitor Regulator Dynamic Ratio Control
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Solution Overview
Problem
Power converter circuits employing switched-capacitor technology face efficiency degradation due to variations in output current, input voltage, and other operating parameters, limiting their performance and requiring frequent changes in conversion ratios to maintain regulation.
Innovation Solution
A reconfigurable switched-capacitor power converter circuit that dynamically adjusts the conversion ratio of interleave circuits and increases the interleave factor by progressively changing switch configurations in response to operating parameter changes, using a control circuit to monitor and manage these adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed conversion ratio is used in switched-capacitor circuits, then the circuit structure is simple, but conversion efficiency degrades under varying operating conditions
Solution Approach 1:
The patent implements dynamic conversion ratio adjustment by reconfiguring switch connections based on operating conditions. The control circuit monitors input voltage, output voltage, and load current to determine optimal conversion ratios, allowing the circuit to adapt from 1:1 to 2:1 ratios. This dynamic reconfiguration maintains high conversion efficiency across varying conditions without requiring multiple fixed circuits.
Solution Approach 2:
The patent changes the conversion ratio parameter dynamically based on operating conditions. By monitoring voltage and current parameters, the control circuit adjusts the conversion ratio between 1:1 and 2:1 to optimize efficiency. This parameter change approach allows a single circuit to operate efficiently across a wide range of conditions without increasing physical circuit complexity.
2Reliability
If conversion ratio changes are implemented frequently to maintain regulation, then regulation accuracy is maintained, but control complexity increases
Solution Approach 1:
The patent employs feedback control where the control circuit continuously monitors output voltage and load current to detect regulation events. When the output voltage deviates from the target level, the feedback mechanism triggers a conversion ratio change. This closed-loop feedback ensures regulation accuracy while minimizing unnecessary switching by only changing ratios when regulation events are detected.
Solution Approach 2:
The control circuit is designed to anticipate regulation needs by monitoring operating parameters in advance. Before significant voltage deviation occurs, the control circuit detects trends and proactively adjusts the conversion ratio to prevent regulation errors, reducing the frequency of corrective changes and simplifying control.
3Object-generated harmful factors
If multiple interleave circuits are used, then voltage ripple is reduced, but circuit complexity and switching coordination difficulty increase
Solution Approach 1:
The patent divides the switched-capacitor circuit into multiple interleave circuits (first, second, and third interleave circuits) that operate in parallel. Each interleave circuit processes a portion of the total current, which reduces voltage ripple on the output. The segmentation allows the large current to be distributed across multiple smaller switching paths, smoothing the overall output voltage.
Solution Approach 2:
The interleave circuits are activated in a periodic, interleaved manner with phase-shifted switching cycles. While one interleave circuit is charging capacitors, another is discharging, creating overlapping current waves that cancel ripple. This periodic interleaved operation reduces voltage ripple amplitude while maintaining the benefits of multiple circuits without requiring all to switch simultaneously.
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 approach maintains high conversion efficiency and regulation across varying operating conditions by dynamically adjusting the conversion ratio and interleave factor, reducing voltage ripple and improving overall performance of the power converter circuit.
Implementation Method 1
a switched-capacitor circuit that includes a plurality of interleave circuits, where the switched-capacitor circuit is configured to sequentially activate each of the plurality of interleave circuits to generate a particular voltage level
Implementation Method 2
A control circuit may monitor one or more operating parameters associated with the switched-capacitor circuit, and detect, using result from monitoring the one or more operating parameters, a regulation event
Data Source
AI summary
A power converter circuit included in a computer system may include multiple switched-capacitor circuits that may each be configured to generate a particular voltage level on a regulated power supply node according to a corresponding conversion ratio. A control circuit may, in response to detection of a regulation event, sequentially change the conversion ratios of the multiple-switched capacitor circuits.