Load Adaptive Power Supply Bridge Rectifier Efficiency
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Solution Overview
Problem
Current power converter applications face challenges in achieving high energy efficiency across a wide range of loads, particularly the stringent efficiency requirements at 10% of full load for the highest 'titanium' grade, which existing technologies find difficult to meet effectively.
Innovation Solution
A load adaptive power supply that utilizes a conducting resistance controllable bridge rectifying unit, driven by a digital microcontroller, to adjust on-resistance based on load power through a pulse modulation signal, enhancing power conversion efficiency from light to heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power converter structures are used, then the device complexity is low, but the power conversion efficiency cannot meet the stringent titanium grade requirements especially at light loads (10% full load)
Solution Approach 1:
The patent implements dynamic adjustment of the on-resistance of the bridge rectifying unit based on real-time load detection. The controller modifies the conducting resistance of the rectifying elements according to load conditions, transitioning from fixed resistance to variable resistance operation. This dynamic adaptation enables the system to optimize efficiency across the entire load range, particularly improving light-load efficiency to meet titanium grade requirements while maintaining manageable device complexity through intelligent control.
Solution Approach 2:
The patent changes the key parameter of on-resistance from a fixed value to a variable parameter that can be dynamically adjusted. By controlling the conducting resistance of the bridge rectifying unit based on load conditions, the system optimizes power conversion efficiency at different operating points. This parameter change approach allows the power supply to adapt its electrical characteristics to match varying load demands, resolving the contradiction between efficiency and complexity.
2Loss of energy
If the on-resistance is fixed, then the device complexity is low, but the efficiency at varying load conditions cannot be optimized
Solution Approach 1:
The patent incorporates a feedback mechanism where the controller continuously monitors load conditions and adjusts the on-resistance of the bridge rectifying unit accordingly. This closed-loop control enables the system to respond to varying load demands in real-time, optimizing energy efficiency across the entire operating range. The feedback approach resolves the contradiction by introducing intelligent control that adapts the system's electrical parameters to match actual operating conditions.
Solution Approach 2:
The system transitions from static on-resistance to dynamic on-resistance adjustment based on load conditions. The controller modifies the conducting resistance of the rectifying elements in response to varying load demands, enabling the power supply to maintain optimal efficiency across light, medium, and heavy load operations. This dynamic behavior allows the system to overcome the limitations of fixed resistance designs without excessive complexity.
3Loss of energy
If conventional rectifying elements are used, then the manufacturing is simple, but the power conversion efficiency at light loads does not meet titanium grade requirements
Solution Approach 1:
The patent modifies the electrical parameters of the bridge rectifying unit by enabling dynamic control of the on-resistance. This is achieved by integrating control circuitry that adjusts the conducting resistance of the rectifying elements based on load conditions. The parameter change approach improves light-load efficiency to meet titanium grade requirements while maintaining relatively simple manufacturing through the use of standard power electronic components with added control functionality.
Solution Approach 2:
The patent enhances the functionality of conventional rectifying elements by adding control capabilities that enable them to operate in multiple modes (fixed resistance and variable resistance). This multi-functionality allows the same rectifying unit to serve both simple conduction and adaptive efficiency optimization roles, improving light-load performance without requiring completely different components and maintaining ease of manufacture.
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
The solution enables improved power conversion efficiency and energy savings by dynamically adjusting the on-resistance of the bridge rectifying unit according to varying load conditions, effectively meeting the high efficiency standards across different load levels.
Implementation Method 1
adjust an on-resistance of a conducting resistance controllable bridge rectifying unit according to different values of the power of the load
Implementation Method 2
a load power measurement unit for measuring a power of the load; and a digital microcontroller unit coupled with the driving circuit unit and the load power measurement unit to determine a duty ratio
Data Source
AI summary
A load adaptive power supply including: a conducting resistance controllable bridge rectifying unit for generating a full-wave rectified output voltage according to an AC input voltage to drive a load, and controlling an on-resistance thereof during at least one half cycle of a positive half cycle and a negative half cycle of the AC input voltage according to at least one control signal; a driving circuit unit configured to generate the at least one control signal according to a pulse modulation signal; and a digital microcontroller unit coupled with the driving circuit unit to determine a duty ratio of the pulse modulation signal according to a power of the load to drive the driving circuit unit, so as to adjust the on-resistance of the conducting resistance controllable bridge rectifying unit according to different values of the power, thereby increasing a power conversion efficiency of the power supply.