Isolated Switching Regulator Smart Supply for Light-Load Control Power
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Solution Overview
Problem
Existing isolated switching regulators face challenges in providing sufficient power to control circuits, especially during light load conditions, and rely on costly and complex auxiliary windings or self-power supplies.
Innovation Solution
The proposed isolated switching regulator employs a control circuit with a loop controller and a driver, where the loop controller is powered by the output voltage, and the driver can be powered either by the output voltage or by a voltage across the secondary winding, depending on the output voltage's sufficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If self-power supply is used to power the control circuit and driver, then the device complexity is reduced, but the power supply may be insufficient in light load condition
Solution Approach 1:
The patent implements a dynamic power supply selection mechanism where the driver can switch between two power sources: the self-power supply (derived from output voltage) and an auxiliary power source (secondary winding voltage). The system dynamically evaluates which power source is available and sufficient at any given moment, allowing it to adapt to varying load conditions. This resolves the contradiction by maintaining low complexity through self-powering while ensuring reliability through dynamic power source switching when needed.
Solution Approach 2:
The patent changes the operational parameters of the power supply system by introducing a dual-power architecture. The driver's power supply voltage and current availability are dynamically adjusted based on load conditions. When output voltage is sufficient, the self-power supply is used; when insufficient, the system transitions to using power from the secondary winding. This parameter-based adaptation resolves the contradiction between simplicity and reliability.
2Reliability
If an auxiliary winding is added to provide power supply, then the power supply sufficiency is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the secondary winding serve multiple functions: it provides power supply to the driver when needed (powering function) and maintains its primary function of voltage transformation. By enabling the secondary winding to act as both a power source and a transformation element, the system avoids adding dedicated auxiliary windings while ensuring power sufficiency. This multi-functionality approach resolves the contradiction between reliability and complexity.
Solution Approach 2:
The system uses its own secondary winding to provide supplemental power to the driver when the self-power supply is insufficient, rather than requiring external auxiliary components. The switching regulator essentially serves its own power needs by intelligently utilizing the power already present in the secondary winding, resolving the contradiction without adding device complexity.
3Device complexity
If the driver is always powered by the output voltage, then the device complexity is reduced, but the power supply reliability under varying load conditions deteriorates
Solution Approach 1:
The patent implements dynamic power supply selection where the driver's power source is not fixed but adapts to load conditions. The control circuit continuously monitors the sufficiency of the self-power supply and dynamically switches between self-power mode and auxiliary power mode. This dynamic approach maintains low device complexity while ensuring power supply reliability across varying load conditions.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor the power supply status and dynamically adjust the driver's power source. By detecting whether the self-power supply is sufficient or insufficient, the system provides feedback to the power management logic, which then selects the appropriate power source. This feedback-driven approach resolves the contradiction between simplicity and reliability.
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 ensures reliable power supply to the control circuit without the need for auxiliary windings, reducing costs and complexity while maintaining high efficiency across varying load conditions.
Implementation Method 1
Isolated switching regulators typically adopt a transformer to perform isolation between primary side and secondary side
Implementation Method 2
The first capacitor is configured to store a first power supply to power the loop controller, wherein the first power supply is derived from the output voltage. The second capacitor is configured to store a second power supply to power the driver
Data Source
AI summary
An isolated switching regulator with adjustable power supplies is discussed. The isolated switching regulator includes a control circuit having a loop controller and a driver, which are powered by different power source based on different output voltage conditions.