Adjustable Driver Voltage Source for Switching Power Supply Efficiency
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Solution Overview
Problem
Switching power supplies experience low power efficiency at light loading due to high switching losses, which existing technologies attempt to address with complex circuits for adjustable driver voltage, but these solutions require multiple power supplies or intricate detection methods.
Innovation Solution
An adjustable driver voltage source using a linear regulator and a modulator that detects loading changes to adjust the driver voltage, reducing the complexity by using a single driver voltage and eliminating the need for external signals, applicable to both single-chip and multi-chip switching power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver voltage Vcc is kept high to ensure proper switching operation, then the reliability of power switch switching is improved, but the switching loss increases at light loading
Solution Approach 1:
The driver voltage Vcc is made dynamic rather than fixed. The linear regulator adjusts Vcc based on loading conditions: at light loading, Vcc is reduced to minimize switching losses; at heavy loading, Vcc is increased to ensure reliable switching operation. This dynamic adjustment resolves the contradiction between maintaining reliability and reducing energy loss.
Solution Approach 2:
The voltage parameter Vcc is changed according to operating conditions. By varying the driver voltage level based on load current detection, the system optimizes the balance between switching reliability and power efficiency, reducing switching losses at light loading while maintaining adequate voltage levels at heavy loading.
2Loss of energy
If a linear regulator with external control signal is used to adjust driver voltage, then the power efficiency at light loading is improved, but the device complexity increases
Solution Approach 1:
The system uses its own internal resources to control the linear regulator. The load current detection circuit within the power supply generates the control signal for voltage adjustment, eliminating the need for external control signals. This self-service approach improves power efficiency while avoiding the complexity of external control circuits.
Solution Approach 2:
The linear regulator is integrated into the existing power supply architecture and serves multiple functions: it provides stable driver voltage, enables dynamic voltage adjustment based on load conditions, and improves overall power efficiency. This multi-functionality reduces the need for separate control circuits, thereby managing device complexity.
3Adaptability or versatility
If multiple power supplies are used to provide driver voltages for high-side and low-side drivers, then the driver voltage control flexibility is improved, but the device complexity increases
Solution Approach 1:
Multiple driver voltage supplies are merged into a single linear regulator that serves both the high-side and low-side drivers. The regulator dynamically adjusts the driver voltage based on overall loading conditions, providing adequate voltage levels for both drivers without requiring separate power supplies. This consolidation reduces device complexity while maintaining control flexibility.
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 solution improves power efficiency by lowering the driver voltage at light loading, simplifying the circuit architecture and reducing the number of required power supplies, while maintaining efficiency across varying load conditions.
Implementation Method 1
uses a linear regulator to provide a driver voltage to a driver
Implementation Method 2
a modulator responsive to the loading change of the switching power supply to control the linear regulator to adjust the driver voltage
Data Source
AI summary
An adjustable driver voltage source for a switching power supply uses a linear regulator to provide a driver voltage, and a modulator to adjust the driver voltage according to the loading change of the switching power supply. The modulator may lower the driver voltage at light load to reduce the switching loss and thereby increase the power efficiency of the switching power supply.