Distributed Transformer Power Combiner With Amplifier Voltage Balancing
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Solution Overview
Problem
Transformer power combiners in power amplifier systems often suffer from imbalance between different power amplifiers, leading to reduced power combining efficiency and extra stress on the amplifiers.
Innovation Solution
A transformer power combiner balancing apparatus is introduced, which includes a first power amplifier coupled to primary windings of a distributed transformer, a second power amplifier coupled to additional primary windings, and conductive elements connecting the output terminals of both power amplifiers to balance the voltage potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transformer power combiner is used to combine power amplifier outputs, then power combining efficiency is improved, but voltage imbalance between power amplifiers occurs causing reduced efficiency and extra stress
Solution Approach 1:
The patent connects corresponding output terminals of multiple power amplifiers through conductive elements to establish equipotential connections. This ensures that voltage potentials at corresponding terminals are equalized, preventing voltage imbalance and reducing stress on the amplifiers while maintaining power combining efficiency.
2Reliability
If conductive elements are added to balance voltage potentials, then voltage balance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple conductive elements into a single integrated conductive structure that connects all corresponding output terminals simultaneously. This integration approach achieves voltage balancing across all amplifiers while minimizing the total number of discrete conductive elements required.
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 apparatus effectively balances the voltage potentials between the power amplifiers, reducing imbalance and improving power combining efficiency by ensuring equal drive of input port pairs of the distributed transformer.
Implementation Method 1
The first secondary winding NS1 is magnetically coupled to the first primary winding NP1. The second secondary winding NS2 is magnetically coupled to the second primary winding NP2. The third secondary winding NS3 is magnetically coupled to the third primary winding NP3. The fourth secondary winding NS4 is magnetically coupled to the fourth primary winding NP4.
Data Source
AI summary
An apparatus includes a first power amplifier having a negative output terminal coupled to a first primary winding of a distributed transformer and a positive output terminal coupled to a second primary winding of the distributed transformer, a second power amplifier having a negative output terminal coupled to a third primary winding of the distributed transformer and a positive output terminal coupled to a fourth primary winding of the distributed transformer, a first conductive element connected between the negative output terminal of the first power amplifier and the negative output terminal of the second power amplifier, and a second conductive element connected between the positive output terminal of the first power amplifier and the positive output terminal of the second power amplifier.