Selective Drive Acceleration Circuit for Fast Switching Without Stress
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Solution Overview
Problem
Existing drive acceleration circuits cause excessive stress in semiconductor switching devices due to abrupt turn-off, especially when operating at highly frequent on/off switching states, leading to increased risk of stress and potential damage.
Innovation Solution
A drive acceleration circuit with a first and second signal route, where the second route includes a drive acceleration unit and a selective conduction unit, controlled by a switch circuit to be included or excluded based on the switching device's working periods, accelerating turn-on and turn-off speeds while minimizing stress through time division control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a drive acceleration circuit is used to accelerate turn-on and turn-off speeds of switching devices, then switching frequency and productivity are improved, but stress on the switching device increases due to abrupt turn-off
Solution Approach 1:
The patent applies dynamics by making the drive acceleration circuit dynamically controllable through a control signal. The circuit transitions between active and inactive states based on timing requirements, allowing the turn-off speed to be adjusted dynamically. When the control signal is active, the acceleration circuit operates to speed up turn-off; when inactive, it allows slower, stress-free turn-off. This dynamic adaptation resolves the contradiction between high switching frequency and stress reduction.
Solution Approach 2:
The patent implements periodic action through time-division control of the drive acceleration circuit. The control signal activates the acceleration circuit during specific time periods (when high-speed turn-off is needed) and deactivates it during other periods (when stress-free operation is prioritized). This periodic switching of the acceleration function allows the system to achieve high productivity during critical periods while protecting the device during vulnerable periods, effectively resolving the technical contradiction.
2Speed
If drive acceleration unit is always included in the circuit, then turn-on and turn-off speeds are continuously accelerated, but current changes excessively rapidly causing stress risks
Solution Approach 1:
The patent applies the taking out principle by selectively removing the drive acceleration unit from the circuit during periods when its operation would cause harmful effects. The control signal disconnects the acceleration unit during critical phases of switching device operation, allowing the device to operate without acceleration-induced stress. This selective extraction of the acceleration function resolves the contradiction between maintaining high switching speeds and ensuring device reliability.
Solution Approach 2:
The patent makes the circuit configuration dynamic by allowing the drive acceleration unit to be connected or disconnected based on operational requirements. Rather than a fixed configuration, the circuit adapts its structure in real-time through the control signal, switching between accelerated and non-accelerated modes. This dynamic reconfiguration enables the system to optimize between speed and reliability depending on the operational context.
3Productivity
If switching device operates at highly frequent on/off states, then productivity is improved, but conduction losses increase with slow switching speed
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the switching speed through controlled acceleration. During frequent switching operations, the drive acceleration circuit is activated to reduce turn-on and turn-off times, thereby minimizing the duration of high-current states and reducing conduction losses. The dynamic nature of the acceleration circuit allows it to provide speed enhancement only when needed for high-frequency operation, while maintaining device safety through selective deactivation during vulnerable periods.
Data Source
AI summary
A drive acceleration circuit, including: a drive power supply, including an output end and a reference signal end, where the output end output a drive signal, and the reference signal end is connected to a connection end of a switching device and output a reference signal to the connection end; a first signal route, where the first signal route is 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/off; and a second signal route, connected in parallel with the first signal route, including a drive acceleration unit and a selective conduction unit, one end of the drive acceleration unit is connected to the drive power supply, another end of the drive acceleration unit is connected to the switching device through the selective conduction unit.