Intelligent Charging System Phase Detection Inrush Current Control
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Solution Overview
Problem
Charging multiple digital devices simultaneously can lead to power distribution system overload, triggering overload protection and causing power interruptions due to high inrush currents when power switches are turned on, which can damage the switches and reduce their service life.
Innovation Solution
An intelligent charging system that includes a phase detecting device, a current detecting device, and a controller to determine the optimal phase time interval for turning on power switches, minimizing inrush currents by adjusting the control parameters and correcting for aging-related delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power switch is turned on to charge multiple digital devices, then the charging function is provided, but the inrush current causes the power distribution system to overload and triggers the overload protection mechanism
Solution Approach 1:
The controller detects the phase of the input voltage before turning on the power switch and delays the switching action until the voltage phase is within the allowable range. This preliminary phase detection and timing adjustment prevents inrush current from triggering overload protection, allowing continuous charging operation.
2Productivity
If the power switch is turned on with large inrush current, then the digital devices can be charged, but the metal contact of the power switch may be melted and service life is reduced
Solution Approach 1:
The controller performs preliminary detection of the input voltage phase and calculates the appropriate delay time before turning on the power switch. By advancing the timing control based on detected phase information, the system ensures the switch closes during the zero-crossing period, minimizing inrush current and preventing contact damage.
Solution Approach 2:
The controller continuously monitors the actual turned-on time point of the power switch and compares it with the expected timing based on phase detection. When a discrepancy is detected (indicating aging or drift), the controller resets and adjusts the control parameters, creating a closed-loop feedback system that maintains optimal switching timing throughout the power switch's service life.
3Productivity
If the controller keeps switching the power switches to charge all digital devices, then complete charging is achieved, but the frequent switching causes aging of parts and variation in working time
Solution Approach 1:
The controller monitors the actual turned-on time point of each power switch and compares it with the timing predicted from phase detection. When the actual timing deviates from the expected timing (indicating aging or drift), the controller automatically resets and recalibrates the control parameters for that switch, creating a self-correcting system that maintains timing consistency despite repeated switching operations.
4Reliability
If multiple charging areas are provided to prevent overload, then power distribution stability is improved, but the system complexity and user disturbance increase
Solution Approach 1:
Instead of physically dividing the system into multiple charging areas, the controller performs preliminary detection of the input voltage phase and proactively schedules power switch activation during zero-crossing periods. This timing-based control prevents inrush current from causing overload conditions, eliminating the need for multiple physical charging areas while maintaining power distribution stability.
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
Effectively suppresses inrush currents and prolongs the service life of power switches by ensuring they are turned on during intervals with lower current demand, thereby preventing overload and reducing user disturbance.
Implementation Method 1
The phase detecting device is configured to determine an allowable phase time interval of a phase of a power source
Implementation Method 2
The current detecting device is connected to the first switching element, wherein the current detecting device is configured to detect a first turned on time point when the first switching element is turned on
Implementation Method 3
If the first turned on time point is not within the allowable phase time interval, the controller resets a first control parameter of the first control signal
Data Source
AI summary
An intelligent charging system comprises a first switching element, a phase detecting device, a current detecting device and a controller. The first switching element is turned on or off based on a first control signal. The phase detecting device is configured to determine an allowable phase time interval of a phase of a power source. The current detecting device is connected to the first switching element. The current detecting device is configured to detect a first turned on time point when the first switching element is turned on. The controller is connected to the phase detecting device and the current detecting device. The controller is configured to determine whether the first turned on time point is within the allowable phase time interval. If the first turned on time point is not within the allowable phase time interval, the controller resets a first control parameter of the first control signal.