Single Transformer Gate Driver for PWM Signal Transmission
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Solution Overview
Problem
Existing gate driver circuits for high-power switching devices require additional transformers and power sources, increasing size, material, and manufacturing costs, while failing to efficiently transmit pulse width modulation signals.
Innovation Solution
A single transformer-based gate driver system that includes an RF source, PWM controller, edge detector, pulse generating circuit, transformer, rectifier circuit, signal recovery circuit, and drive circuit, capable of amplifying and transmitting pulse width modulation signals to high-power switching devices, with optional protection and fault detection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transformer is used to electrically isolate the controller from the switching device, then electrical isolation is achieved, but additional transformers and power sources are required, increasing device complexity and size
Solution Approach 1:
The patent combines the power transmission function and signal transmission function into a single transformer. The primary winding receives both a power signal and a modulated control signal, and the secondary winding provides both power to the gate driver and the amplified control signal to the switching device. This merging eliminates the need for separate transformers and power sources, reducing device complexity while maintaining electrical isolation.
Solution Approach 2:
The single transformer is designed to perform multiple functions simultaneously: it provides electrical isolation between controller and switching device, transmits power to the gate driver circuit, and transmits the amplified PWM control signal to the switching device. This multi-functionality resolves the contradiction by making one component serve multiple purposes that previously required separate components.
2Reliability
If additional transformers and power sources are used, then reliable power and signal transmission is achieved, but manufacturing cost and material usage increase
Solution Approach 1:
By merging power transmission and signal transmission into a single transformer, the patent reduces the total number of components that need to be manufactured, assembled, and tested. This reduces material usage, assembly complexity, and manufacturing cost while maintaining the reliability of signal and power transmission through the unified design.
3Device complexity
If the controller directly drives the high-power switching device, then circuit simplicity is achieved, but the controller cannot produce sufficient current or voltage to switch the device
Solution Approach 1:
The patent introduces a gate driver circuit as an intermediary between the controller and the high-power switching device. This gate driver is powered by and receives control signals from the single transformer, which itself is driven by the controller. The gate driver provides the necessary current and voltage amplification to properly switch the high-power device, while the transformer provides isolation and signal amplification. This intermediary approach maintains relative circuit simplicity while achieving the required power levels.
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 system effectively amplifies and transmits pulse width modulation signals to high-power switching devices, reducing size and cost while maintaining electrical isolation, and includes protection and fault detection mechanisms to ensure reliable operation.
Implementation Method 1
a transformer comprising a primary side and a secondary side, the primary side of the transformer operably connected to an output of the edge detector and pulse generating circuit, the secondary side of the transformer operably connected to a rectifier circuit and a signal recovery circuit
Implementation Method 2
the secondary side of the transformer operably connected to a rectifier circuit and a signal recovery circuit
Data Source
AI summary
The disclosure relates to a devices, systems and methods implementing a single transformer-based gate driver. In one embodiment, single transformer-based gate driver includes an RF source; a PWM controller; an edge detector and pulse generating circuit operably connected to the RF source and PWM controller; a transformer comprising a primary side and a secondary side, the primary side of the transformer operably connected to an output of the edge detector and pulse generating circuit, the secondary side of the transformer operably connected to a rectifier circuit and a signal recovery circuit; and a drive circuit operably connected to the rectifier circuit and the signal recovery circuit.