Multilevel Push-Pull Converter Sequential Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing push-pull DC-DC converters face limitations in reducing filter impedances and achieving multiple voltage levels, with restricted regulation possibilities and increased switching losses at higher frequencies.
Innovation Solution
A push-pull DC converter design with additional primary winding sections and switches, allowing sequential switching to generate multiple voltage levels and reduce ripple current, while enabling more efficient energy conversion and regulation opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the switching frequency is increased to reduce filter size, then the filter impedance is reduced, but the switching losses increase
Solution Approach 1:
The primary winding is divided into multiple sections with intermediate taps, allowing the converter to operate in multiple discrete voltage levels (bipolar multilevel). This segmentation enables the use of lower effective switching frequencies while achieving the same filter reduction effect, as the multiple levels naturally reduce ripple current amplitude without requiring proportionally higher switching frequencies.
2Adaptability or versatility
If additional primary winding sections and switches are added to generate multiple voltage levels, then the regulation possibilities and voltage levels increase, but the device complexity increases
Solution Approach 1:
The additional intermediate taps on the primary winding serve multiple functions: they enable multiple output voltage levels, provide regulation points, and allow bipolar operation. The same structural addition (intermediate taps) simultaneously achieves voltage multiplication and regulation capability without requiring separate control mechanisms for each function.
3Loss of energy
If sequential switching of multiple switches is implemented to eliminate dead time, then the switching losses are reduced, but the control complexity increases
Solution Approach 1:
The converter operates by periodically switching through different primary winding sections in a defined sequence, with each section activated for a specific duration within a switching cycle. This periodic sequential switching pattern eliminates dead time by ensuring continuous energy transfer while maintaining predictable, repeatable control that simplifies timing requirements compared to arbitrary switching sequences.
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
The design reduces filter impedances, allows for more voltage levels and regulation possibilities, and processes higher power with lower filter impedances, eliminating dead time and negative voltages across switches.
Implementation Method 1
at least one secondary winding, magnetically coupled to the primary winding for providing the output voltage
Data Source
AI summary
A power converter for converting an input voltage (Vin) into an output voltage (Vout), comprising a first supply potential and a second supply potential established by the input voltage, and at least one primary winding having two terminals, a center tap arranged between the two terminals and connected to the first supply potential, and at least one secondary winding magnetically coupled to the primary winding for providing at least one output voltage (Vout) and a first controllable switch connected between the second supply potential and one terminal of the primary winding and a second controllable switch connected between the second supply potential and the other terminal of the primary winding and a third controllable switch connected between the second supply potential and the one terminal of the primary winding and a fourth controllable switch connected between the second supply potential and the other terminal of the primary winding, and a control unit for controlling the switches such that the first, second, third, and fourth switches are turned on sequentially wherein at any time maximum one switch is turned on.