Flyback Converter Segmented Primary Windings
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Solution Overview
Problem
Conventional flyback converters face restrictions when dealing with high input voltage sources, particularly on the voltage switch and transformer components, limiting their usage.
Innovation Solution
A flyback converter design featuring a transformer with multiple primary windings connected in parallel to capacitive devices, which divide the input voltage, allowing the use of commoditized switches like MOSFETs and reducing restrictions on individual switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single high-voltage switch is used in conventional flyback converters, then the converter can handle high input voltage sources, but the switch and transformer components face greater restrictions and higher costs
Solution Approach 1:
The single high-voltage switch is segmented into multiple low-voltage switches (e.g., three MOSFETs) that operate in parallel. Each switch handles a portion of the total input voltage, allowing the use of commoditized low-voltage components instead of expensive high-voltage switches. The transformer is similarly segmented into multiple primary windings, each connected to a corresponding low-voltage switch.
2Ease of manufacture
If multiple primary windings are used with capacitive voltage division, then restrictions on individual switches are reduced, but the transformer and circuit complexity increase
Solution Approach 1:
Capacitive dividers are introduced as intermediary components between the high-voltage input source and the multiple low-voltage primary windings. These capacitors perform the voltage division function, allowing the transformer to use simpler low-voltage windings while still handling high input voltages. The capacitive dividers mediate the voltage transformation, reducing the complexity burden on the transformer design.
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 design reduces the magnitude of voltage seen by each primary winding, lowers peak input current and frequency harmonics, distributes power losses, minimizes transformer volume, and enables the use of low-voltage switches, resulting in improved efficiency and reduced component costs.
Implementation Method 1
the capacitive divider then divides the input voltage into a plurality of smaller, divided voltages which are provided to each one of the capacitive devices
Implementation Method 2
a transformer having a plurality of primary windings inductively coupled to at least one secondary winding
Data Source
AI summary
The flyback converter generally has a capacitive divider operatively connectable to a voltage source for receiving an input voltage, the capacitive divider having a plurality of capacitive devices connected in series from one another; a transformer having a plurality of primary windings inductively coupled to at least one secondary winding, each one of the primary windings of the transformer being connected in parallel to a corresponding one of the capacitive devices of the capacitive divider via a switching device, each of the at least one secondary winding being connected to a forwardly biased and capacitive circuit connectable to an output load; and a controller connected to each one of the switching devices for operating the flyback converter to power the output load with the voltage source.