Current Balancing Circuit for Multi-Voltage Systems
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Solution Overview
Problem
Electronic devices designed to operate on multiple supply voltages often exceed design constraints, affecting their own operation and that of connected peripheral devices, due to imbalances in current draw from these voltages.
Innovation Solution
A current balancing circuit that supplements current from a lower supply voltage with a higher supply voltage based on a gain setting, using switches and an inductor to manage current flow and prevent exceeding design constraints, implemented with control circuitry that adjusts thresholds and gain settings according to operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electronic device draws current from multiple supply voltages to meet power demands, then the power availability is improved, but the current draw may exceed design constraints and adversely affect other peripheral devices and host computer operation
Solution Approach 1:
The current balancing circuit continuously monitors the current drawn from each supply voltage and dynamically adjusts the current distribution. When the current from one supply voltage approaches its design constraint, the circuit automatically reduces the draw from that supply and increases the draw from the other supply voltages, ensuring compliance with design constraints while maintaining adequate power availability.
Solution Approach 2:
The circuit dynamically changes the operating parameters (current draw levels) from each supply voltage based on real-time conditions. By adjusting the current distribution ratios between multiple supply voltages, the system adapts to varying load conditions and ensures that no single supply voltage exceeds its design constraints, thereby preventing harmful effects on peripheral devices and host computer.
2Power
If the current draw from a supply voltage exceeds design constraints, then the power demand is met, but the operation of other peripheral devices and host computer is adversely affected
Solution Approach 1:
The current balancing circuit acts as an intermediary between the multiple supply voltages and the load. It monitors and regulates the current draw from each supply voltage, distributing the power demand across multiple sources in a controlled manner. This intermediary function ensures that the power demand is met while preventing any single supply voltage from exceeding its design constraints, thereby protecting the reliability of peripheral devices and host computer operation.
3Object-affected harmful factors
If a current balancing circuit is implemented to distribute current from multiple supply voltages, then the current draw compliance is improved, but the device complexity increases
Solution Approach 1:
The current balancing circuit is designed to perform multiple functions: it monitors current draw from multiple supply voltages, dynamically adjusts current distribution, ensures compliance with design constraints, and protects the stability of the overall system. By consolidating these functions into a single integrated circuit, the design achieves current draw compliance without proportionally increasing device complexity.
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
This solution effectively balances current draw, reducing transients and peak current from the lower supply voltage, enhancing stability and compliance with design specifications, while allowing for optimal performance across different operating modes.
Implementation Method 1
An inductor is coupled through a second switch to a current sink
Data Source
AI summary
A current balancing circuit is disclosed comprising a first current detector configured to measure a first current flowing from a first supply voltage to a first load, and a second current detector configured to measure a second current flowing through an inductor from a second supply voltage to the first load. The first current is compared to a first threshold to generate an error signal, and the error signal is amplified by a gain to generate a second threshold. When the first current is above the first threshold and the second current is below the second threshold, a first switch is controlled to connect a first end of the inductor to the second supply voltage. When the second current is above the second threshold, a second switch is controlled to connect the first end of the inductor to a current sink.