Time-Divided Drive Acceleration Circuit for Switching Stress Control
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Solution Overview
Problem
Existing drive acceleration circuits for semiconductor switching devices, such as IGBTs, fail to effectively address the challenge of stress risks due to abrupt switching, particularly when operating at highly frequent on/off states, leading to increased stress and potential device failure.
Innovation Solution
A drive acceleration circuit with a selective conduction unit that controls the inclusion and exclusion of a drive acceleration unit in specific periods, using zener diodes or transient voltage suppressors to manage current changes, thereby accelerating and decelerating switching speeds as needed to prevent stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a drive acceleration circuit is used to enable highly frequent on/off switching, then the switching speed is improved, but the switching device turns off abruptly causing excessive stress
Solution Approach 1:
The patent applies dynamics by making the drive acceleration circuit configurable and controllable. The circuit transitions from a static always-on design to a dynamic system where the acceleration unit can be selectively enabled or disabled based on operating conditions. This is achieved through configuration circuits and control circuits that adjust the circuit's behavior in real-time, allowing optimal balancing between switching speed and stress reduction.
Solution Approach 2:
The patent implements parameter changes by modifying the operational parameters of the drive acceleration circuit. Through configuration circuits, the circuit can change its acceleration characteristics based on different operating modes. The control circuits adjust parameters such as acceleration timing and intensity dynamically, enabling the system to adapt switching behavior to specific operational requirements and reduce stress during critical phases.
2Productivity
If the drive acceleration unit is always included in the circuit, then turn-on and turn-off speeds are continuously accelerated, but stress risk increases during certain operating periods
Solution Approach 1:
The system transitions from a static always-active acceleration circuit to a dynamic configurable system. Configuration circuits enable the acceleration unit to be selectively activated or deactivated based on operating modes, while control circuits provide real-time adjustment. This dynamic behavior allows the system to maintain high productivity when needed while protecting reliability during stress-sensitive operations.
Solution Approach 2:
The patent implements periodic action through controlled activation and deactivation of the drive acceleration unit. The control circuits manage periodic switching of the acceleration function, enabling it to operate during specific time intervals or operational phases. This periodic engagement allows the system to achieve high switching frequencies during safe periods while avoiding stress-induced damage during critical periods, thus balancing productivity and reliability.
3Productivity
If switching device operates in highly frequent on/off state, then productivity is improved, but conduction losses increase with slow switching speed
Solution Approach 1:
The patent applies parameter changes by using configuration circuits to adjust the switching characteristics of the drive acceleration circuit. By modifying operational parameters such as charging currents and voltage levels, the system optimizes switching speed to reduce conduction losses during high-frequency operation. The control circuits further fine-tune these parameters dynamically based on actual operating conditions, ensuring minimal energy loss while maintaining high productivity.
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 effectively accelerates switching speeds while minimizing stress on the semiconductor devices by controlling current changes, ensuring stable operation and reducing the risk of device failure.
Implementation Method 1
using zener diodes or transient voltage suppressors to manage current changes
Implementation Method 2
The selective conduction unit is configured to control a working status of the second drive tributary
Data Source
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AI summary
This application provides a drive acceleration circuit, including: a drive power supply, including an output end and a reference signal end, where the output end is configured to output a drive signal, and the reference signal end is electrically connected to a connection end of a switching device and is configured to output a reference signal to the connection end; a first drive tributary, where the first drive tributary is electrically connected to the output end of the drive power supply and a control end of the switching device, and is configured to drive, based on the drive signal, the switching device to turn on or turn off; and a second drive tributary, which is connected in parallel with the first drive tributary, where the second drive tributary includes a drive acceleration unit and a selective conduction unit, one end of the drive acceleration unit is electrically connected to the output end of the drive power supply, another end of the drive acceleration unit is electrically connected to the control end of the switching device through the selective conduction unit, the selective conduction unit is turned on in a time division manner to make the second drive tributary closed or open, and the drive acceleration unit is configured to accelerate on/off of the switching device based on the drive signal when the second drive tributary is closed. This application further provides a circuit system.