H Bridge Circuit With Anti-Series Diodes For Magnetic Characterization
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Solution Overview
Problem
Existing excitation circuits, such as dual active bridge (DAB) topologies, face challenges in generating precise trapezoidal excitation for magnetic materials, which can be exacerbated by leakage inductance mismatches and limited scalability in experimental validation, leading to unclear characterization of magnetic materials and restricted design capabilities.
Innovation Solution
A circuit comprising two or more voltage sources conductively coupled to H bridge circuits with anti-series diodes, allowing for the application of variable waveform excitation, including trapezoidal and sinusoidal waveforms, to accurately characterize magnetic components by minimizing sensor and circuit impacts on measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If dual active bridge topology is used to excite magnetic materials, then high frequency operation and energy storage are achieved, but trapezoidal waveform distortion and leakage inductance mismatch occur
Solution Approach 1:
An auxiliary transformer is introduced as an intermediary component between the DAB converter and the magnetic material under test. This auxiliary transformer with adjustable turns ratio serves as a mediator to transform the voltage waveform and provide precise trapezoidal excitation, eliminating the waveform distortion caused by leakage inductance mismatch in direct DAB excitation
Solution Approach 2:
The turns ratio of the auxiliary transformer is made adjustable to change the excitation voltage parameters. By varying the turns ratio, the system can compensate for leakage inductance effects and achieve accurate trapezoidal waveform excitation while maintaining high frequency operation
2Adaptability or versatility
If auxiliary windings are added to magnetic cores for experimental validation, then additional excitation capability is provided, but system complexity and measurement uncertainty increase
Solution Approach 1:
The auxiliary transformer serves multiple functions: it provides adjustable trapezoidal excitation, enables different operating conditions, and maintains compatibility with standard DAB topology. This multi-functionality achieves versatile excitation capability without proportionally increasing system complexity
Solution Approach 2:
The auxiliary transformer acts as an intermediary that simplifies the measurement system by providing a controlled excitation interface, reducing the need for complex auxiliary windings and measurement arrangements on the magnetic core itself
3Device complexity
If MOSFET voltage drop is used to generate negative voltage for core characterization, then circuit simplicity is maintained, but measurement accuracy deteriorates due to parasitic effects
Solution Approach 1:
The auxiliary transformer serves as an intermediary that provides accurate voltage transformation without the parasitic effects of MOSFET on-resistance. It enables precise negative voltage generation for bipolar excitation while maintaining circuit simplicity and measurement accuracy
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
Enables precise characterization of magnetic materials, improves the understanding of magnetization physics, and allows for the design of devices that utilize these principles effectively, enhancing the efficiency and speed of electrical component manufacturing and validation processes.
Implementation Method 1
A circuit comprising two or more voltage sources conductively coupled to H bridge circuits with anti-series diodes, allowing for the application of variable waveform excitation, including trapezoidal and sinusoidal waveforms, to accurately characterize magnetic components
Data Source
AI summary
A circuit for testing an electronic component, such as a transformer, includes at least two power supplies and at least two H bridge circuits. A first H bridge circuit is conductively coupled in parallel to a first power supply. A second H bridge circuit is conductively coupled in parallel to a second power supply. The second H bridge circuit includes one or more anti-series diodes for preventing current from the first power supply from passing through the second H bridge circuit to the second power supply. The first H bridge circuit and the second H bridge circuit are configured to conductively couple to the electronic component for providing a voltage with a predefined waveform to the electronic component.