Dual Switched Capacitor Circuits With Staggered Dead Time
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Solution Overview
Problem
Switched capacitor circuits experience significant power loss and ripple voltage due to overlapping dead time when multiple switches are turned on simultaneously, which affects power conversion efficiency.
Innovation Solution
Implementing a dual switched capacitor circuit configuration where one circuit powers the load during the dead time of the other, with controlled transistor transitions and delayed switching to minimize simultaneous switch-on events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple switched capacitor circuits operate simultaneously, then power supply capability is improved, but overlapping dead time causes increased power loss and ripple voltage
Solution Approach 1:
The control circuit generates non-overlapping control signals that proactively prevent simultaneous dead time in parallel switched capacitor circuits. By advancing the switching coordination before dead time overlap can occur, the system maintains continuous power supply while avoiding the harmful overlapping period where all switches are off.
Solution Approach 2:
The control circuit monitors the switching states of multiple parallel switched capacitor circuits and dynamically adjusts their control signals to eliminate dead time overlap. This feedback mechanism ensures that when one circuit enters dead time, another circuit is actively supplying power, thereby preventing energy loss while maintaining stable output.
2Power
If multiple switched capacitor circuits operate simultaneously, then power supply capability is improved, but overlapping dead time causes increased ripple voltage
Solution Approach 1:
The control circuit proactively coordinates the switching phases of parallel circuits to ensure continuous power delivery. By pre-synchronizing the switching sequences, the system guarantees that at least one circuit is always in the power supply phase, eliminating the ripple-causing gaps that occur during dead time overlap.
Solution Approach 2:
The system maintains continuous useful action by ensuring that power supply to the load never interrupts. The control circuit orchestrates parallel switched capacitor circuits so that their dead times are staggered, creating an unbroken chain of power delivery that minimizes output voltage ripple while maximizing supply capability.
3Loss of energy
If dead time is extended to prevent switch-on conflicts, then power conversion efficiency is improved, but power supply continuity deteriorates
Solution Approach 1:
The system segments the power supply function across multiple parallel switched capacitor circuits. Each circuit handles a portion of the power delivery responsibility, allowing individual circuits to have extended dead times for efficient switching while the collective system maintains continuous power supply through coordinated operation of the segments.
Solution Approach 2:
The control circuit merges the output of multiple parallel switched capacitor circuits to create a composite power supply that maintains continuity. By combining the staggered dead time characteristics of individual circuits, the system achieves both high efficiency (through optimized individual dead times) and continuous power delivery (through the merged output).
Data Source
AI summary
An electronic circuit includes a first switched capacitor circuit and a second switched capacitor circuit. The first switched capacitor circuit charges and discharges a first flying capacitor to power a load. The second switched capacitor charges and discharges a second flying capacitor to power the load. When the first switched capacitor operates in a dead time, the second switched capacitor powers the load with the second flying capacitor.