Flyback USB Power Delivery Circuit for Stable Internal Voltage
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Solution Overview
Problem
Power delivery apparatuses face challenges in maintaining a constant internal operating voltage across a wide output voltage range while reducing voltage stress on capacitors, especially when dealing with variable charging supply voltages.
Innovation Solution
The power delivery apparatus employs a flyback converter with a transformer having a primary coil and multiple secondary coils with different winding directions, along with rectification circuits, to generate both charging supply voltage and internal operating voltage, using a regulator to stabilize the internal operating voltage regardless of the charging supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide output voltage range is provided for charging, then the adaptability to different target devices is improved, but the voltage stress on capacitors increases and the internal operating voltage becomes difficult to maintain constant
Solution Approach 1:
The patent divides the secondary coil into multiple secondary coils with different winding directions (first secondary coil with clockwise winding, second secondary coil with counter-clockwise winding). Each secondary coil is connected to a separate rectification circuit, allowing independent processing of voltage components. This segmentation enables the system to handle wide output voltage ranges while maintaining stable internal operating voltage through selective rectification and regulation.
2Device complexity
If a single secondary coil is used, then the device complexity is reduced, but the ability to reduce voltage stress on capacitors and maintain constant internal voltage is limited
Solution Approach 1:
The patent employs asymmetric winding directions for the secondary coils (one clockwise, one counter-clockwise) to create complementary voltage outputs. This asymmetric configuration allows the rectification circuits to process voltage components in opposite phases, effectively reducing voltage stress on capacitors through balanced charge-discharge cycles while maintaining a constant internal operating voltage.
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 configuration allows for stable supply of a constant internal operating voltage across a wide range of charging supply voltages, reducing voltage stress on capacitors and ensuring efficient power delivery to various electronic devices.
Implementation Method 1
a first driving circuit configured to output the charging supply voltage by an induced electromotive force based on a current flowing through the primary coil and a second driving circuit configured to output an internal operating voltage by the induced electromotive force
Data Source
AI summary
Disclosed is a power delivery apparatus for transmitting power through a universal serial bus (USB). The power delivery apparatus may include a driving circuit configured to output an internal operating voltage by an induced electromotive force due to a current flowing through a primary coil. The driving circuit may include secondary coils having different winding directions and may be configured such that a plurality of rectification circuits are coupled in series.