Switching Power Converter Auxiliary Winding Current Isolation
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Solution Overview
Problem
In switching power converters, the power delivered to the secondary-winding and load is not accurately known due to unmonitored power demands of the auxiliary power supply, which affects the energy transfer between the primary and auxiliary windings.
Innovation Solution
A controller is used to control the energy transfer from the primary winding to the secondary and auxiliary windings during mutually exclusive periods, by adjusting the reflected voltages to isolate the secondary-winding current from the auxiliary-winding current, ensuring precise determination of charge delivery to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the auxiliary power supply takes charge from the primary winding, then the auxiliary power supply can provide power to the controller, but the amount of power delivered to the secondary-winding and load is not accurately known
Solution Approach 1:
The patent segments the energy transfer process into distinct time periods: a first time period where energy is transferred only to the secondary-winding, and a second time period where energy is transferred only to the auxiliary-winding. This temporal segmentation allows independent measurement and control of power delivered to each winding, resolving the measurement precision problem while maintaining auxiliary power supply functionality.
2Measurement precision
If the auxiliary power supply is actively controlled, then precise determination of charge delivery to the load is achieved, but the device complexity increases
Solution Approach 1:
The patent implements periodic action by alternating between two distinct operating modes: a first mode where the auxiliary power supply is disabled and energy transfers only to the secondary-winding, and a second mode where the auxiliary power supply is enabled and energy transfers only to the auxiliary-winding. This periodic switching simplifies the control logic compared to continuous multi-parameter control, as it uses simple enable/disable signals timed to switching cycles.
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 allows for precise control and determination of the charge delivered to the load, independent of the auxiliary power supply's charge, ensuring accurate power distribution and meeting varying power demands.
Implementation Method 1
transferring energy from a primary winding of a transformer of a switching power converter to a secondary-winding and to an auxiliary-winding
Data Source
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AI summary
An electronic system and method include a controller (206) to actively control power transfer from a primary winding (110) of a switching power converter to an auxiliary-winding (212) of an auxiliary power supply 214). The switching power converter is controlled and configured such that during transfer of power to the auxiliary-winding (212), the switching power converter does not transfer charge to one or more secondary-windings (116) of the switching power converter. Thus, the switching power converter isolates one or more secondary transformer winding currents (is) from an auxiliary-winding current. By isolating the charge delivered to the one or more secondary-windings (116) from charge delivered to the auxiliary-winding (212), the controller can accurately determine an amount of charge delivered to the secondary-windings (116) and, thus, to a load (108).