Switch Drive Device Speed Adjustment Feedback Control
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Solution Overview
Problem
In electrical power converters, the switching speed of switches can deviate from optimal levels when changing states, leading to decreased effectiveness in suppressing surge voltages and reducing switching losses, as existing methods rely on detecting voltage and current to adjust gate currents.
Innovation Solution
A drive device for switches that includes a control section generating speed adjustment information and a drive circuit calculating command switching speed information to adjust switching speeds based on this information, ensuring appropriate switching speeds even under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If active gate control is used to adjust gate current based on voltage and current detection, then switching speed can be optimized, but switching speed may deviate from optimal levels when switches change states
Solution Approach 1:
The patent implements feedback control by detecting the actual switching speed of the switch and comparing it with the target switching speed. The control device adjusts the gate current based on the difference between actual and target switching speeds, ensuring the switch operates at optimal speed while maintaining surge voltage suppression effectiveness.
Solution Approach 2:
The patent dynamically adjusts the gate current in real-time based on the detected switching speed. Instead of using fixed gate current values, the system continuously modifies the gate current to match the actual switching conditions, ensuring optimal switching speed is maintained even when operating conditions change.
2Loss of energy
If gate current is adjusted based on voltage and current detection, then switching performance can be improved, but switching losses may increase when switching speed deviates from optimal
Solution Approach 1:
The control device uses feedback from actual switching speed detection to adjust gate current, minimizing switching losses by ensuring the switch transitions at optimal speed. This feedback mechanism prevents energy waste that would occur with fixed or improperly adjusted gate currents.
Solution Approach 2:
The patent changes the gate current parameter dynamically based on detected switching speed. By adjusting this critical parameter in real-time, the system optimizes the balance between switching speed and switching losses, improving overall switching efficiency.
3Manufacturing precision
If simple voltage and current detection is used for gate control, then device complexity is reduced, but switching speed control precision decreases
Solution Approach 1:
The patent incorporates feedback detection of actual switching speed, which provides precise control information. This feedback mechanism enables high-precision switching speed control by continuously monitoring and adjusting based on real switching conditions, outweighing the added complexity.
Solution Approach 2:
The control system uses the switch's own switching characteristics (detected through voltage and current) to regulate its own gate current. This self-service approach achieves precise control without requiring external complex control systems, as the system uses its inherent electrical characteristics for regulation.
Data Source
AI summary
A drive device performs switching of at least one switch configuring an electrical power converter. The drive device includes a control section that generates a drive signal for the switch and transmits the drive signal, and at least one drive circuit that receives the transmitted drive signal. The control section generates speed adjustment information for adjusting a switching speed of the switch and transmits the speed adjustment information to the drive circuit. The drive circuit includes a speed calculation section that receives the transmitted speed adjustment information and calculates command switching speed information of the switch based on the received speed adjustment information, and a drive section that performs switching of the switch based on the received drive signal and the calculated command switching speed information.