Power Supply Control for Portable Devices
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Solution Overview
Problem
Conventional power supply methods for portable electronic devices are inefficient when the rated output power of the power adaptor does not match the load specification of the device, leading to potential overloading and reduced power supply efficiency.
Innovation Solution
A power supply control method that detects the input voltage and current, calculates the equivalent input impedance, and sets a work load to match the power adaptor's output capacity, ensuring efficient and safe power delivery by dynamically adjusting the current extraction based on the actual output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the portable electronic device uses a constant load setting to extract current from the power adaptor, then the device can operate with simple control logic, but the power supply efficiency deteriorates when the power adaptor's rated output power does not match the device's load specification
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant load setting to a dynamic load adjustment mechanism. The control chip sequentially sets different detection loads (first detection load, second detection load) to measure the power adaptor's output characteristics, then dynamically adjusts the work load based on the detected actual output voltage. This dynamic approach enables the device to adapt to different power adaptor specifications while maintaining efficient power supply.
Solution Approach 2:
The patent implements feedback by measuring the actual output voltage of the power adaptor during detection phases and using this feedback information to adjust the work load. The control chip detects the voltage drop under different load conditions, calculates the actual output voltage, and feeds this information back to determine the appropriate work load setting. This closed-loop feedback mechanism ensures optimal power extraction efficiency regardless of the power adaptor's rated output power.
2Power
If the device extracts maximum current according to its load specification, then the device can achieve maximum power intake, but the power adaptor may overload and cause safety risks
Solution Approach 1:
The patent applies preliminary action by performing detection operations before the actual power supply phase. The control chip sequentially sets detection loads to measure the power adaptor's output characteristics and calculate its actual output voltage capability. Based on these preliminary measurements, the device determines a safe work load that prevents overload. This preliminary detection and calculation process ensures that the subsequent power intake operates within safe limits while maximizing power extraction capability.
3Ease of operation
If the device uses a fixed work load setting, then the control system remains simple, but the device cannot adapt to different power adaptor specifications and loses power supply efficiency
Solution Approach 1:
The patent applies self-service by enabling the device to automatically detect and adapt to different power adaptor specifications without requiring manual configuration or complex user input. The control chip autonomously performs sequential detection with different loads, calculates the actual output voltage, and self-adjusts the work load setting. This self-service mechanism maintains relative control system simplicity while achieving high adaptability to various power adaptor rated output powers.
Data Source
AI summary
A power supply control method and a portable electronic device using the same are provided. The power supply control method includes following steps: detecting an input voltage and an input current at a power input terminal of the portable electronic device; setting a plurality of detection loads sequentially to control a power adaptor to provide a detection current as the input current for the portable electronic device respectively; calculating an equivalent input impedance of the power input terminal according to the detection current and the corresponding input voltage; calculating an actual output voltage of the power adaptor according to the equivalent input impedance, the input voltage, and the input current; and setting a work load according to the actual output voltage to control the power adaptor to provide a work current as the input current for the portable electronic device.