Reconfigurable Charge Pump for Touch Screen Drivers
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Solution Overview
Problem
Existing charge pumps in electronic systems are inefficient when faced with changes in input supply voltage or desired output signals, leading to high output impedance and inefficient operation, requiring either tailored designs for specific systems or universal designs that operate inefficiently.
Innovation Solution
A reconfigurable charge pump with an array of charge pump cells and control device that dynamically selects and configures the arrangement of cells based on input voltage and requested parameters to boost voltage and current levels, reducing output impedance through parallel configuration of voltage boosting paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If charge pumps are designed with a fixed configuration for a specific input voltage, then operational efficiency is improved, but adaptability to different voltage requirements deteriorates
Solution Approach 1:
The charge pump configuration is made dynamic through switching circuits that can reconfigure the charge pump cells between series and parallel arrangements. This allows the system to adapt its electrical characteristics in real-time based on input voltage levels and output current requirements, resolving the contradiction between fixed-configuration efficiency and adaptability.
Solution Approach 2:
The charge pump is divided into multiple independent charge pump cells that can be individually switched and reconfigured. This segmentation enables flexible combination of cells in series or parallel depending on the operational requirements, allowing the system to maintain efficiency across different voltage and current conditions.
2Adaptability or versatility
If charge pumps operate with changed input supply voltage or desired output signal, then adaptability is improved, but output impedance increases causing inefficient operation
Solution Approach 1:
The switching circuit dynamically reconfigures the charge pump cells based on detected input voltage levels and output current requirements. This dynamic adaptation maintains optimal output impedance across varying operating conditions by adjusting the number of cells in series versus parallel configuration, preventing the impedance instability that would otherwise occur with fixed configurations.
3Ease of manufacture
If charge pumps provide universal design for different systems, then ease of manufacture is improved, but operational efficiency deteriorates
Solution Approach 1:
The charge pump is designed with multiple reconfigurable cells that can be arranged in different configurations to serve various voltage and current requirements. This universal design allows a single device to replace multiple specialized charge pumps, achieving ease of manufacture while maintaining operational efficiency through active reconfiguration based on specific system requirements.
Data Source
AI summary
An apparatus includes a reconfigurable charge pump including charge pump cells configurable into multiple different arrangements. The apparatus includes a control device configured to select a first arrangement of the charge pump cells from the multiple different arrangements based, at least in part, on an input voltage received by the reconfigurable charge pump and requested parameters of a drive signal for a touch screen panel. The reconfigurable charge pump can boost the input voltage based, at least in part, on the first arrangement of the charge pump cells. The control device can generate the drive signal according to the requested parameters based on the boosted input voltage.