Power Converter Pass-Through Control for Lower Switching Loss
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Solution Overview
Problem
Conventional power converters in battery-powered devices operate at high input voltage ranges, leading to increased switching losses and reduced battery life, especially when loads can function with lower input voltages.
Innovation Solution
A controller determines the battery voltage and switches between a pass-through mode and a switching mode for the power converter based on a threshold voltage, maintaining the load voltage at either the battery voltage or a threshold voltage, minimizing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the power converter operates in switching mode to provide load voltage equal to threshold voltage, then battery life is extended by reducing switching losses, but the load receives lower power and the heating element produces less heat
Solution Approach 1:
The power converter dynamically switches between pass-through mode and switching mode based on real-time comparison of battery voltage with threshold voltage. This dynamic operation allows the system to adapt between high-power delivery (pass-through mode when battery voltage is high) and energy-efficient operation (switching mode when battery voltage drops), resolving the contradiction between power delivery and battery life extension
Solution Approach 2:
The system changes the operating parameters of the power converter by selecting different modes (pass-through or switching) based on battery voltage levels. This parameter change enables the system to optimize the trade-off between delivering high power to the load and extending battery life by minimizing switching losses at appropriate voltage thresholds
2Power
If the power converter operates in pass-through mode to provide load voltage equal to battery voltage, then power delivery to the load is maximized, but switching losses increase and battery life is reduced
Solution Approach 1:
The system dynamically adjusts the power converter mode based on battery voltage conditions. When battery voltage is high (above threshold), pass-through mode is selected to maximize power delivery. When battery voltage drops below the threshold, the system transitions to switching mode to reduce switching losses. This dynamic adaptation resolves the contradiction between maximizing power delivery and minimizing energy losses
Solution Approach 2:
The operating parameters of the power converter are changed based on battery voltage levels. The system uses threshold voltage comparison to determine when to switch between pass-through mode (high power delivery, higher losses) and switching mode (reduced power delivery, lower switching losses), thereby optimizing the balance between power delivery and energy efficiency
3Loss of energy
If the power converter constantly operates in switching mode, then switching losses are reduced and battery life is extended, but the device complexity increases due to continuous voltage monitoring and mode switching control
Solution Approach 1:
The control system is segmented into distinct operational modes (pass-through mode and switching mode) with clear transition thresholds. This segmentation simplifies the control logic by defining specific conditions for mode switching based on voltage comparisons, reducing the overall system complexity while still achieving energy efficiency goals
Solution Approach 2:
The system implements feedback control by continuously monitoring battery voltage and comparing it with a threshold voltage. This feedback mechanism automatically triggers mode transitions when voltage thresholds are crossed, providing simple yet effective control that reduces switching losses without requiring complex control algorithms
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 approach extends battery life by reducing switching losses during normal operation and allows efficient power delivery to loads, optimizing battery performance.
Implementation Method 1
a power converter connected between the battery and the load... the power converter is configured to generate a load voltage to a load that is equal to the battery voltage
Data Source
AI summary
Systems and methods for operating a power converter of a device are described. A controller of the power converter may determine a battery voltage of a battery of the device and determine whether the battery voltage meets a threshold voltage. Responsive to determining that the battery voltage meets the threshold voltage, the controller may cause the power converter to operate in a pass-through mode where the power converter provides a load voltage to a load that is equal to the battery voltage. Alternatively, responsive to determining that that battery voltage does not meet the threshold voltage, the controller may cause the power converter to operate in a switching mode where the power converter provides the load voltage that is equal to the threshold voltage. By using the pass-through mode when the battery voltage meets the threshold voltage, a battery life of the device may be conserved.