Charge Pump Scaling Highest Voltage Among Multiple Inputs
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Solution Overview
Problem
Charge pumps face challenges in scaling the highest of multiple varying voltages effectively, particularly in environments where the voltage levels change continuously or discretely, requiring a solution to select and scale the highest voltage in real-time to power switches in DC-DC converters and power amplifiers.
Innovation Solution
A charge pump system comprising a selector circuit with comparators and switches to identify and scale the highest voltage among multiple inputs, using a scaler circuit to generate a scaled voltage that is greater than any of the input voltages, ensuring proper operation of switches in DC-DC converters and power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a charge pump scales a single input voltage, then the circuit structure is simple, but it cannot handle multiple varying voltage inputs effectively
Solution Approach 1:
The charge pump is divided into distinct functional modules: a selector circuit that identifies the highest voltage among multiple inputs, and a scaling circuit that multiplies the selected voltage. This segmentation allows the system to handle multiple varying voltage inputs independently through dedicated comparison and selection logic, while maintaining manageable complexity through modular design.
Solution Approach 2:
The selector circuit incorporates multiple voltage input terminals and comparison mechanisms that can universally handle any number of varying voltage inputs. The same basic comparison and selection architecture can accommodate different numbers of inputs by simply adding more input terminals and comparison elements, providing universal adaptability without fundamentally changing the circuit's operational principle.
2Adaptability or versatility
If the charge pump uses a fixed scaling factor, then the circuit is simple to design, but it cannot adapt to varying voltage requirements of different switches
Solution Approach 1:
The charge pump employs a dynamic scaling mechanism where the scaling factor can be adjusted based on the selected input voltage and the specific requirements of the connected switch. The circuit includes control logic that determines the appropriate scaling factor in real-time, allowing the output voltage to dynamically adapt to different input conditions and load requirements, rather than using a fixed predetermined scaling ratio.
3Measurement precision
If the selector circuit continuously monitors all input voltages, then the highest voltage is accurately identified, but the power consumption increases
Solution Approach 1:
The selector circuit implements periodic monitoring of input voltages rather than continuous monitoring. The comparison and selection operations are performed at discrete time intervals synchronized with the switching cycle of the power converter. This periodic action maintains accurate identification of the highest voltage while significantly reducing the average power consumption compared to continuous monitoring, as the comparison elements are activated only when needed.
Data Source
AI summary
A charge pump includes a scaler circuit and a selector circuit. The scaler circuit is designed to scale an intermediate voltage by a scaling factor to generate a scaled voltage. The selector circuit is designed to select and provide the intermediate voltage from multiple voltages. The selector circuit includes a comparator block to generate a select signal indicating which of the multiple voltages has the highest magnitude. The selector circuit includes multiple switches, each switch to receive a respective voltage from among the multiple voltages and pass the corresponding voltage as the intermediate voltage if the select signal indicates that the voltage received by the corresponding switch has the highest magnitude.