Isolated Gate Driver With Adaptive Slew Rate Control
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Solution Overview
Problem
Conventional isolated gate drivers for power devices in vehicles have fixed slew rate settings, limiting adaptability and efficiency, especially in high-voltage applications, as they rely on external resistors for controlling gate voltage slope.
Innovation Solution
An isolated gate driver system that includes a low voltage part, insulation part, and high voltage part, with a PWM transmission unit, low voltage logic block, high voltage logic block, and adaptive control unit, allowing for dynamic slew rate control based on PWM signals and control signals from a microcontroller unit, and sensing information like voltage, current, and temperature to adjust the slew rate of the gate voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external resistors with fixed resistance values are used to control slew rate, then the circuit design is simple, but the slew rate is fixed only to initial design values and cannot be adjusted
Solution Approach 1:
The patent applies dynamics by transforming the static fixed resistor-based slew rate control into a dynamic adjustable system. The insulation part enables real-time adjustment of slew rate parameters during operation, allowing the system to adapt to different conditions while maintaining a relatively simple circuit structure through integrated control.
Solution Approach 2:
The patent implements parameter changes by enabling modification of slew rate parameters through the insulation part. Instead of changing physical resistor values, the system changes the electrical parameters dynamically, allowing multiple slew rate settings without requiring multiple fixed resistors or complex switching networks.
2Adaptability or versatility
If insulation part is added for high voltage boosting and control, then slew rate can be dynamically controlled, but the device complexity increases
Solution Approach 1:
The insulation part serves multiple functions simultaneously: it provides electrical isolation between low voltage and high voltage circuits, enables high voltage boosting for the gate driver, and facilitates dynamic slew rate control. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in overall device complexity.
3Adaptability or versatility
If fixed slew rate is used, then the gate driver is simpler, but it cannot adapt to different operating conditions like temperature and load
Solution Approach 1:
The gate driver system implements self-service by automatically adjusting the slew rate based on feedback from temperature sensors and load conditions. The insulation part monitors operating parameters and autonomously modifies control signals to optimize performance, eliminating the need for manual intervention or complex external control circuitry.
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 flexible and adaptive control of slew rates during power device turn-on and turn-off, improving stability and efficiency, reducing the need for external devices and enhancing fuel efficiency in vehicle systems by optimizing gate voltage slope based on real-time conditions.
Implementation Method 1
an insulation part for boosting the low voltage PWM signal and the low voltage control signal into a high voltage PWM signal and a high voltage control signal, respectively
Data Source
AI summary
The isolated gate driver according to the present invention comprises a low voltage part including a PWM transmission unit for receiving a PWM signal from a microcontroller unit and outputting a low voltage PWM signal, and a low voltage logic block for receiving a control signal from the microcontroller unit and outputting a low voltage control signal; an insulation part for boosting the low voltage PWM signal and the low voltage control signal into a high voltage PWM signal and a high voltage control signal, respectively; and a high voltage part including a high voltage logic block for outputting a slew rate control signal in accordance with the high voltage control signal, and a slew rate controller for controlling a slew rate of a gate voltage of a power device external to the isolation gate driver such that the gate voltage of the power device has the slew rate depending on the slew rate control signal at a rising edge or a falling edge, wherein the high voltage part is insulated from the low voltage part by the insulation part.