Light Load Detection Circuitry for Power Bank Battery Drain Prevention
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Solution Overview
Problem
Conventional power bank devices lack effective mechanisms to prevent battery drainage in light load conditions, leading to unnecessary power dissipation and energy wastage.
Innovation Solution
The integration of light load detection circuitry and a single power switch circuit topology with four power transistors, which detects low current draw and disables the DC-to-DC converter to prevent further current flow, ensuring the power bank operates in a disabled mode and preventing battery discharge in light load situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the DC-to-DC converter remains enabled in light load conditions, then the power bank can continue to supply power to external devices, but the battery will be unnecessarily drained and energy will be wasted
Solution Approach 1:
The power bank system dynamically adjusts its operating state based on load conditions. The light load detection circuitry continuously monitors the current draw, and when light load conditions are detected (current below a predetermined threshold), the system automatically transitions the DC-to-DC converter from enabled to disabled state. This dynamic adaptation allows the system to optimize energy consumption by disabling unnecessary power conversion operations while maintaining the ability to resume normal operation when load conditions improve.
2Device complexity
If the power bank operates without light load detection, then the device structure remains simple, but unnecessary power dissipation occurs and energy is wasted
Solution Approach 1:
A light load detection circuitry is introduced as an intermediary component between the DC-to-DC converter and the power management system. This detection circuitry includes voltage detection circuitry and current detection circuitry that work together to monitor system conditions and generate appropriate control signals. The intermediary detection mechanism enables the system to identify light load conditions and trigger the disable signal to the DC-to-DC converter, thereby reducing power dissipation without requiring complete redesign of the power bank architecture.
3Loss of energy
If the DC-to-DC converter is disabled in light load conditions, then battery drainage is prevented, but the power bank cannot supply power until manually reactivated
Solution Approach 1:
The power bank system incorporates automatic reactivation capability through its detection circuitry. When the load conditions change from light load to normal load (current exceeds the predetermined threshold), the light load detection circuitry automatically detects this change and generates an enable signal to reactivate the DC-to-DC converter without requiring manual intervention. This self-service mechanism ensures that the power bank maintains operational availability while conserving energy during light load periods, as the system autonomously manages its own power conversion operations based on real-time load conditions.
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 prevents battery drainage in light load conditions by disabling the DC-to-DC converter, thereby conserving energy and preventing unwanted power dissipation, ensuring the battery is not inadvertently drained when no significant load is connected.
Implementation Method 1
DC-to-DC switching converter circuitry (14) including a controller (23), an inductor (24), and an output storage capacitor (25)
Implementation Method 2
a rechargeable battery, buck converter circuitry, boost converter circuitry
Implementation Method 3
light load detection circuitry (15) including a Voltage Detector and Disable Signal Generating Circuit (VDDSGC) (15)
Data Source
AI summary
A power bank device has an input connector, an output connector, a DC-to-DC switching converter, a plurality of battery cells coupled together in series, and novel light load detection circuitry. The power bank device is operable in a discharging mode in which the battery cells power the DC-to-DC converter, and the converter drives a regulated DC voltage onto the output connector. The detection circuitry detects whether a light load condition exists in which only a small amount of current is being output onto the output connector. If the condition is detected, then the converter is disabled so that current flow out of the output connector is stopped. In one example, the condition is detected by supplying a constant current onto the output connector and detecting whether the voltage on the output connector rises and stays above a predetermined voltage for a predetermined amount of time.