Isolated Gate Driver Circuit for Stable MOS Gate Turn-Off
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Solution Overview
Problem
Existing technologies have not effectively addressed the challenge of driving a MOS gate-like structure transistor, where transmitting power and signal simultaneously over a single coreless transformer is not feasible, leading to unstable turn-on and turn-off behavior.
Innovation Solution
A power electronics device utilizing a galvanically isolated gate driver and an energy storage device, such as a capacitor, to stabilize the gate voltage of a voltage-driven transistor, ensuring reliable turn-off through a failsafe technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coreless transformer is used to transmit power and signal simultaneously, then device complexity is reduced, but reliability deteriorates because this approach is not feasible for voltage-driven MOS gate structures
Solution Approach 1:
The patent divides the control signals into separate channels: turn-on signals and turn-off signals are transmitted through different windings of the coreless transformer. This segmentation allows reliable distinction between opposite-polarity signals and enables stable control of voltage-driven MOS gate structures, resolving the reliability issue while maintaining single-transformer simplicity.
Solution Approach 2:
The patent introduces an intermediary mechanism using opposite polarity signaling through separate windings. The turn-on signal and turn-off signal use opposite polarities and are transmitted through different windings, allowing the gate driver to reliably distinguish between activation and deactivation commands, thereby ensuring stable turn-on and turn-off behavior.
2Ease of operation
If power and control signals are transmitted over the same coreless transformer coil, then ease of operation is improved, but manufacturing precision requirements increase due to signal interference issues
Solution Approach 1:
The patent segments the signal transmission by using different windings for turn-on and turn-off signals. This physical separation reduces electromagnetic interference between signals while maintaining the simplicity of single-transformer operation, thereby improving both ease of operation and signal transmission accuracy.
Solution Approach 2:
The patent uses opposite polarity as an intermediary characteristic to distinguish between turn-on and turn-off signals. By assigning opposite polarities to different signal types and transmitting them through separate windings, the system achieves reliable signal differentiation without requiring complex shielding or filtering, thus maintaining manufacturing feasibility while improving signal 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
The solution ensures stable on-state gate voltage and reliable turn-off behavior of MOS gate-like structures by using a coreless transformer, achieving efficient control of voltage-driven transistors.
Implementation Method 1
a coreless transformer configured to receive a power signal and a control signal for the high-voltage switch from the primary side and transmit the power signal and the control signal to the secondary side
Implementation Method 2
an energy storage device configured to store electrical energy from the power signal and release the electrical energy to stabilize a gate voltage of the high-voltage switch during an on-state of the high-voltage switch
Data Source
AI summary
A power electronics device includes a voltage-driven transistor, a galvanically isolated gate driver and an energy storage device. The galvanically isolated gate driver is configured to receive a power signal, a turn-on signal, and a turn-off signal for the voltage-driven transistor over galvanic isolation implemented using a coreless transformer. The energy storage device is electrically connected to a gate of the voltage-driven power transistor and configured to store energy from the power signal received by the galvanically isolated gate driver and use the stored energy to stabilize a gate voltage of the voltage-driven power transistor during an on-state of the voltage-driven power transistor.