Transformer-Isolated High-Side Transistor Driver for Fast Switching
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Solution Overview
Problem
High-side transistor drivers face challenges in quickly turning ON and OFF high-side transistors connected to a positive supply, particularly due to large junction capacitances and the need for specialty semiconductor processes, which results in slow operation and difficulty in integrating multiple high voltage transistors with low voltage transistors on the same die.
Innovation Solution
A high-side transistor driver comprising a sender module, a converter module with a transformer and rectifier, and a receiver module that uses embedded signaling and phase encoding to transition the transistor between ON and OFF states, eliminating the need for high voltage transistors in the level shifter and enabling high frequency power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high voltage transistors are used in the level shifter, then voltage translation capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes high voltage transistors from the level shifter circuit and replaces them with a transformer-based converter module. This extraction eliminates the need for specialty semiconductor processes and complex integration of multiple high voltage transistors, while maintaining the voltage translation function through electromagnetic induction in the transformer.
Solution Approach 2:
The patent introduces a transformer as an intermediary device between the low voltage control circuitry and the high voltage transistor gate. The transformer provides galvanic isolation and voltage step-up, enabling voltage translation without requiring high voltage transistors in the control path, thus simplifying the overall device architecture.
2Reliability
If specialty semiconductor processes are used, then high voltage transistor performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the high voltage transistor requirement from the level shifter design, eliminating the need for expensive specialty semiconductor processes like thick oxide SOI. The voltage translation function is achieved through a standard transformer and rectifier circuit, which can be manufactured using conventional processes, thereby reducing manufacturing costs.
3Strength
If large junction capacitances are present, then high voltage transistor capability is improved, but switching speed deteriorates
Solution Approach 1:
The patent applies preliminary action by using the transformer to pre-charge and prepare the gate voltage before the high voltage transistor needs to switch. The converter module generates the appropriate voltage levels in advance, allowing the transistor to switch more quickly and efficiently, thereby improving switching speed without compromising the transistor's voltage handling capability.
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 enables faster operation of high-side transistor drivers, reduces manufacturing costs and space requirements, and allows for efficient control of high voltage transistors, achieving frequencies up to 50 kHz and supporting applications like fluorescent ballast drivers.
Implementation Method 1
A converter module receives the power input signal and generates an output signal that has a higher voltage than the power input signal. The converter module includes a transformer that receives the power input signal.
Implementation Method 2
The converter module includes a rectifier that communicates with the transformer and generates the output signal.
Data Source
AI summary
A transistor driver includes a sender module configured to generate a power input signal. A converter module includes a transformer including a first side and a second side. The first side of the transformer is configured to receive the power input signal. A rectifier is connected to the second side of the transformer. The converter module is configured to generate an output signal at an output of the rectifier. A first receiver module is connected to each of the second side of the transformer and the output of the rectifier. The first receiver module is configured to transition a first transistor between an ON state and an OFF state based on a first signal received from the second side of the transformer.