Isolation Transformer Stackup for Gate Driver DC Blocking
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Solution Overview
Problem
Existing gate drivers face challenges in efficiently transmitting control signals between low-voltage and high-voltage circuits while maintaining insulation and preventing direct current voltage transmission, which is crucial for safe operation in high-voltage environments such as electric vehicles.
Innovation Solution
The gate driver employs isolation transformers and capacitors to insulate low-voltage and high-voltage circuits, using magnetically coupled coils and capacitors to transmit control signals, ensuring insulation while allowing signal transfer, with a configuration suitable for electric vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation transformers are used to insulate low-voltage and high-voltage circuits, then insulation and safety are improved, but device complexity increases
Solution Approach 1:
The patent uses an isolation transformer as an intermediary device between low-voltage control circuits and high-voltage power circuits. The transformer provides galvanic isolation through magnetic coupling, allowing control signals to be transmitted while preventing direct current transmission and ensuring electrical insulation. This resolves the contradiction by introducing a specialized intermediary component that achieves both safety isolation and functional signal transmission.
2Loss of information
If magnetically coupled coils are used to transmit control signals, then signal transfer capability is improved, but direct current voltage transmission prevention becomes more complex
Solution Approach 1:
The patent replaces direct electrical connection with magnetic field coupling to transmit control signals. The isolation transformer uses electromagnetic induction where the primary coil's varying current creates a changing magnetic flux that induces voltage in the secondary coil, thereby transmitting control signals without direct electrical contact. This substitution of mechanical/electrical connection with field-based coupling achieves signal transmission while inherently blocking direct current voltage transmission.
3Reliability
If isolation transformers are implemented in gate drivers, then reliability in high-voltage environments is improved, but manufacturing complexity increases
Solution Approach 1:
The isolation transformer is designed to perform multiple functions simultaneously: providing galvanic isolation, transmitting control signals, blocking direct current voltage, and ensuring electrical insulation. By consolidating these multiple functions into a single component, the patent reduces overall manufacturing complexity compared to implementing separate components for each function, thereby improving ease of manufacture while maintaining high-voltage environment safety.
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 configuration effectively insulates and transfers control signals between low-voltage and high-voltage circuits, maintaining safety and functionality in high-voltage environments, enhancing the reliability and efficiency of gate drivers in applications like electric vehicles.
Implementation Method 1
using magnetically coupled coils and capacitors to transmit control signals
Implementation Method 2
The gate driver employs isolation transformers and capacitors to insulate low-voltage and high-voltage circuits
Data Source
AI summary
This isolation transformer includes: an isolation layer; a transformer having a first coil and a second coil; and a capacitor having a first capacitor electrode and a second capacitor electrode disposed between the first coil and the second coil. The isolation layer includes a first isolation film in which the first coil is embedded, a second isolation film on the upper surface of the first isolation film, a protective film on the upper surface of the second isolation film, a third isolation film on the upper surface of the protective film, a fourth isolation film on the upper surface of the third isolation film, and a fifth isolation film on the upper surface of the fourth isolation film. The second capacitor electrode is formed between the third isolation film and the fourth isolation film. The second coil is formed between the fourth isolation film and the fifth isolation film.