Switched-Capacitor Power Supply Control for Low-Current Cutoff
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Solution Overview
Problem
Existing power supply systems face inefficiencies due to increased power consumption when current flowing back to the power supply device is below a threshold, leading to unnecessary power supply termination and reduced operational efficiency.
Innovation Solution
A power supply controller circuit comprising a capacitor, switches, a driver circuit, and a control circuit that dynamically adjusts switch states to maintain current flow above a specified threshold, preventing unnecessary power supply termination and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply device increases current supply to reach the current threshold within specified time, then the connection detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The control circuit performs preliminary actions by detecting the load connection status before the power supply device commits to continuous operation. The detector circuit monitors current flow during a specified time window after power supply activation, allowing the system to make informed decisions about continued power supply based on whether the current threshold is met, thereby avoiding unnecessary power consumption while maintaining reliable connection detection
Solution Approach 2:
The system implements feedback through the detector circuit that continuously monitors the current flowing back to the power supply device. This feedback mechanism allows the control circuit to adjust power supply decisions based on real-time current measurements, comparing actual current against the threshold and specified time parameters to determine whether the load is properly connected, thus optimizing both detection accuracy and power consumption
2Use of energy by moving object
If the power supply device stops supplying current when current threshold is not met, then the power consumption is reduced, but the operational efficiency of the electronic device is reduced
Solution Approach 1:
The system dynamically adjusts the power supply strategy based on real-time conditions. Rather than using a static on/off approach, the control circuit evaluates multiple parameters including current magnitude, duration of current flow, and comparison against threshold values within a specified time window. This dynamic decision-making process ensures that power supply is maintained when appropriate (preserving operational efficiency) while being terminated when connection is confirmed absent (reducing power consumption)
3Reliability
If the system uses a specified time window for connection detection, then the false detection is reduced, but the response time increases
Solution Approach 1:
The system optimizes the balance between detection accuracy and response time by carefully selecting and adjusting critical parameters: the current threshold value and the specified time window duration. These parameters are tuned to distinguish genuine connection status from transient states, reducing false detections while minimizing the time required for accurate determination. The control circuit uses these parameter thresholds to make rapid yet accurate connection status decisions
Data Source
AI summary
A power supply controller circuit for effectively saving power under an electrical specification is provided. First terminals of a capacitor and a third switch component are connected to a first terminal of a power supply device. First terminals of first and second switch components are connected to a second terminal of the capacitor. Second terminals of the first and second switch components are connected to a second terminal of the power supply device. A first terminal of a fourth switch component is connected to a second terminal of the third switch component. A control circuit controls operations of the first to third switch components and a driver circuit drives the fourth switch component in the power supply controller circuit, such that a current flowing through the power supply controller circuit to the second terminal of the power supply device is not smaller than a current threshold.