Switch Circuit Charge Pump Segmentation EMI Reduction
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Solution Overview
Problem
Existing charge pump technologies face challenges in efficiently managing low voltage and small size power designs, particularly in integrated circuit manufacturing, where they struggle to minimize electromagnetic interference and maintain cost-effectiveness.
Innovation Solution
A switch circuit comprising multiple switches (S1 to S7) that control the operation of a charge pump, allowing for sequential stages of charge, equalize, and pump operations to efficiently manage voltage across flying and output capacitors, thereby optimizing voltage output and reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional charge pump topologies are used, then voltage conversion function is achieved, but electromagnetic interference increases and size increases
Solution Approach 1:
The charge pump circuit is divided into multiple independent switchable paths with different capacitor configurations. Each path provides a different voltage conversion ratio, allowing the system to segment the overall voltage conversion function into smaller, more controlled stages that generate less electromagnetic interference while maintaining conversion efficiency.
Solution Approach 2:
The circuit employs dynamic switching between different operational modes and capacitor connections based on real-time voltage requirements. This dynamic reconfiguration allows the charge pump to adapt its internal structure to minimize electromagnetic interference for each specific voltage conversion task while maintaining optimal efficiency.
2Power
If voltage conversion efficiency is improved, then power management performance increases, but device complexity increases
Solution Approach 1:
The charge pump circuit is designed with multiple capacitors and switches that can be configured to perform various voltage conversion ratios (e.g., 1.5x, 2x, 2.5x). This multi-functional design allows a single circuit structure to handle different power management requirements without requiring separate dedicated circuits for each conversion ratio, thus improving power management efficiency while controlling overall complexity.
3Volume of moving object
If charge pump size is reduced for low voltage design, then integration capability improves, but voltage regulation capability deteriorates
Solution Approach 1:
The charge pump employs nested capacitor configurations where capacitors can be connected in series or parallel depending on the operational mode. This nesting allows the same physical capacitor components to provide different effective capacitance values and voltage ratings, enabling compact size while maintaining adequate voltage regulation capability through intelligent switching between nested configurations.
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 solution enables a compact, low-cost, and low-EMI charge pump design suitable for integrated circuits, effectively managing low voltage power and enhancing the efficiency of voltage conversion while maintaining a small size.
Implementation Method 1
The charge pump storages and converts charges through a capacitor in conjunction with switch switching
Data Source
AI summary
The switch circuit comprises a first switch, a second switch, a third switch, a forth switch, a fifth switch, a sixth switch and a seventh switch. The first switch couples the voltage input terminal to one terminal of a flying capacitor. The second switch couples one terminal of the flying capacitor to one terminal of the output capacitor. The third switch couples one terminal of the flying capacitor to a common terminal. The fourth switch couples the other terminal of the flying capacitor to one terminal of the output capacitor. The fifth switch couples one terminal of the output capacitor to a positive voltage output terminal. The sixth switch couples the other terminal of the flying capacitor to the common terminal. The seventh switch couples the other terminal of the flying capacitor to a negative voltage output terminal.