Transformer Power Conversion Circuit With Inductive Noise Suppression
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Solution Overview
Problem
Existing power conversion circuits using transformers require additional components like capacitors and wires to suppress noise, leading to increased cost and component count.
Innovation Solution
A power conversion circuit design that uses inductors connected in series to specific transformer terminals to increase impedance and reduce noise propagation, without adding extra components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a capacitor is added to the secondary side to feed noise back to the primary side, then noise suppression is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the noise suppression function from the secondary side circuit and relocates it to the primary side by selecting specific terminals for inductor connection. This eliminates the need for additional capacitors on the secondary side while maintaining noise suppression effectiveness through impedance modification at strategically chosen terminals.
Solution Approach 2:
The existing inductors in the primary side circuit are made to serve dual functions: their original function and noise suppression. By carefully selecting which terminals to connect the inductors to based on impedance characteristics, the circuit uses its own components for noise filtering without requiring external suppression elements.
2Object-affected harmful factors
If additional components are added to suppress noise, then noise suppression is improved, but manufacturing cost increases
Solution Approach 1:
The inductors connected to strategically selected terminals perform multiple functions simultaneously: power conversion and noise suppression. This multi-functionality eliminates the need for separate noise suppression components, reducing part counts and manufacturing costs while maintaining effective noise filtering.
3Object-affected harmful factors
If inductors are connected to terminals with higher minimum impedance, then noise propagation is reduced, but circuit performance may be affected
Solution Approach 1:
The patent applies different impedance characteristics to different terminal combinations by selectively connecting inductors to specific terminals based on their impedance properties. This local differentiation allows noise suppression at critical terminals while maintaining optimal performance characteristics for power conversion, achieving both noise reduction and circuit reliability.
Solution Approach 2:
The patent modifies the impedance parameters of specific terminal combinations by adding inductors only where needed, rather than uniformly across all terminals. This selective parameter change suppresses noise propagation paths while preserving the electrical characteristics necessary for proper circuit operation and performance.
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
Effectively suppresses noise propagation while minimizing the number of components, thus reducing costs and maintaining circuit efficiency.
Implementation Method 1
an inductor connected in series to a terminal of the primary side and a terminal of the secondary side, an impedance of a noise-propagation path between the primary side and the secondary side being higher
Data Source
AI summary
Provided is a power conversion circuit capable of suppressing noise with fewer components, and a method for producing a power converter. A power conversion circuit (50) includes: a transformer (64) having first and second terminals (100, 102) on a primary side, and third and fourth terminals (104, 106) on a secondary side; a first circuit (60) connected to the first and second terminals; a second circuit (62) connected to the third and fourth terminals; and first and second inductors (66, 68) respectively connected in series to two terminals (100, 106) constituting a combination, the combination being either one of a combination of the first terminal (100) and the third terminal (104) and a combination of the first terminal (100) and the fourth terminal (106), a minimum impedance between the two terminals constituting the combination being higher than that of the other combination.