Adaptive Switched Capacitor DC-DC Converter for Low Load Efficiency
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Solution Overview
Problem
Switched capacitor dc-dc converters suffer from switching losses that do not scale with load current, as switches operate consistently regardless of load, leading to inefficiencies and increased power consumption.
Innovation Solution
The implementation of adaptive switching control in switched capacitor dc-dc converters, where the number and operation of switches are adjusted based on load characteristics, using digital controllers and sub-switches to minimize switching losses and optimize energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switches operate consistently regardless of load, then the converter maintains stable voltage regulation, but switching losses increase and do not scale with load current
Solution Approach 1:
The patent applies dynamics by making the switching network adaptable to load conditions. The controller dynamically adjusts which switches are activated based on the detected load current, transitioning from static consistent operation to dynamic load-dependent operation. This resolves the contradiction by allowing the system to maintain voltage regulation stability while reducing switching losses through selective switch deactivation at low loads.
Solution Approach 2:
The patent changes the operational parameters of the switches based on load conditions. By detecting load current and adjusting the number and configuration of active switches, the system modifies its switching parameters dynamically. This allows the converter to maintain proper voltage regulation while minimizing switching losses by using fewer switches when load demand is low.
2Reliability
If the same number of switches are used for a wide range of load currents, then the converter maintains consistent performance, but power consumption does not scale with load
Solution Approach 1:
The patent segments the switching network into multiple independently controllable switches. Instead of using a fixed number of switches for all load conditions, the controller can selectively activate or deactivate individual switches based on load requirements. This segmentation allows the system to maintain performance consistency when needed while reducing power consumption by using only the necessary number of switches for each load level.
Solution Approach 2:
The patent applies partial action by activating only the necessary subset of switches required for the current load level. Rather than consistently operating all switches regardless of load, the system uses partial switch activation to match power consumption to actual load demands, reducing energy waste while maintaining sufficient performance for the given load condition.
3Device complexity
If switches require the same energy per switching event regardless of load, then the switching mechanism remains simple, but overall efficiency decreases at low load currents
Solution Approach 1:
The patent introduces dynamic control of the switching mechanism based on load detection. The controller adjusts the switching configuration by enabling or disabling specific switches according to load current levels. This dynamic approach maintains relative simplicity in the switching mechanism while significantly reducing switching losses at low loads by minimizing the number of active switching events.
Solution Approach 2:
The patent extracts unnecessary switching operations from the system by deactivating switches that are not needed for the current load level. By removing redundant switching events from the operation, the system reduces switching losses without adding significant complexity to the control mechanism, achieving efficiency improvements while maintaining operational simplicity.
Data Source
AI summary
A method and apparatus for regulating a dc-dc converter wherein a plurality of switches are arranged with respect to an energy storage device and an output capacitor. An impedance of one or more of the plurality of switches may be adjusted by altering a non-zero voltage provided to the one or more of the plurality of switches, the altering may be based on a slope control signal output by a multiplexer that receives a signal representing a conductance value of the one or more of the plurality of switches.