Variable Voltage Power Adaptor for DC-DC Conversion Loss Reduction
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Solution Overview
Problem
Existing power supply systems with fixed voltage power adaptors suffer from inefficient power conversion due to large voltage differences across DC/DC transformation units, leading to significant energy loss and increased fabrication costs when trying to meet energy conservation standards.
Innovation Solution
A power supply system with a variable supply voltage mechanism, where the power adaptor adjusts its output voltage based on a command signal from the main equipment, allowing the switching circuit to select between the power adaptor and battery unit, thereby reducing power conversion losses without the need for advanced power adaptors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed voltage power adaptor (19V) is used to power the main equipment, then the power adaptor can reliably supply power to various DC/DC transformation units, but the voltage difference between input and output of the DC/DC transformation units becomes excessively large, resulting in poor power conversion efficiency
Solution Approach 1:
The power adaptor transforms from a fixed voltage output design to a dynamic adjustable voltage output design. The microprocessor controls the power voltage to be adjusted according to the battery charge status, enabling the system to adaptively optimize the voltage difference across DC/DC transformation units and reduce power conversion losses while maintaining reliable power supply.
Solution Approach 2:
The power voltage parameter is made variable rather than fixed. The system changes the power voltage parameter dynamically based on battery charge status (charged vs. uncharged), allowing optimization of the voltage difference for DC/DC transformation and reducing energy loss during power conversion.
2Loss of energy
If an advanced power adaptor is used to improve power conversion efficiency, then the power conversion efficiency can be improved, but the fabrication cost greatly increases
Solution Approach 1:
Instead of using expensive advanced power adaptor hardware, the system achieves improved power conversion efficiency by changing the operating parameter (power voltage) through software control. The microprocessor adjusts the power voltage based on battery status, providing a low-cost software-based solution to reduce power conversion losses.
Solution Approach 2:
The system implements a feedback mechanism where the microprocessor monitors the battery charge status and accordingly adjusts the power voltage output. This closed-loop control enables the system to automatically optimize power conversion efficiency without requiring expensive hardware modifications.
3Device complexity
If the power voltage is fixed and cannot be decreased, then the power adaptor design is simple, but it is of no avail for power management of the whole system and energy loss is inevitable
Solution Approach 1:
The power adaptor design transitions from static fixed voltage to dynamic adjustable voltage. The microprocessor enables real-time adjustment of power voltage based on system power management needs and battery charge status, allowing the system to reduce energy loss while maintaining manageable design complexity through software control.
Data Source
AI summary
A power supply system with a variable supply voltage is provided. The power supply system includes a power adaptor, a battery unit, a switching circuit, and a main equipment. The power adaptor is suitable for producing a power voltage. The switching circuit selects the power adaptor or the battery unit for powering the main equipment. Wherein, the power adaptor adjusts the power voltage according to whether the battery unit performs a charge operation.