Adaptive Gate Voltage Control for Lower Switching Loss
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Solution Overview
Problem
Conventional switching power supplies experience significant losses due to excessively low gate on voltages, which prolong mode switching duration and hinder efficient operation of semiconductor switching devices.
Innovation Solution
A control circuit that detects the current operating condition of semiconductor switching devices and adjusts the gate on voltage to a level not higher than the gate allowable voltage, ensuring it is positively correlated with the operating condition to minimize losses and enhance switching performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant low gate on voltage is used to ensure reliability under extreme conditions, then breakdown is prevented, but mode switching duration increases and switching losses increase
Solution Approach 1:
The gate on voltage is changed from a constant value to a dynamically adjustable value that adapts to different operating conditions. The control circuit monitors operating conditions and adjusts the gate on voltage in real-time, allowing the system to optimize between reliability and switching performance based on current operational state.
Solution Approach 2:
The gate on voltage parameter is changed from a fixed constant to a variable parameter that changes based on operating conditions. By adjusting this electrical parameter dynamically, the system achieves both reliable operation under extreme conditions and optimized switching performance under normal conditions.
2Reliability
If a constant low gate on voltage is used to ensure reliability under extreme conditions, then breakdown is prevented, but mode switching duration increases
Solution Approach 1:
The gate on voltage transitions from a static constant value to a dynamic variable that responds to operating conditions. This allows the switching duration to be optimized in real-time without compromising reliability, as the voltage adjusts to match the actual operational state of the semiconductor device.
Solution Approach 2:
The gate on voltage parameter is modified from a fixed value to a condition-dependent variable. This parameter change enables the system to reduce mode switching duration when conditions permit while maintaining reliability constraints when operating under extreme conditions.
3Loss of energy
If a higher gate on voltage is used to shorten mode switching duration, then switching losses are reduced, but breakdown may occur under extreme conditions
Solution Approach 1:
The gate on voltage is transformed from a fixed high value to a condition-adjustable parameter. This allows the system to apply higher voltages when conditions allow (reducing switching losses) while automatically lowering the voltage when extreme conditions are detected (preventing breakdown).
Solution Approach 2:
The control circuit implements feedback by monitoring operating conditions and using this information to adjust the gate on voltage accordingly. This closed-loop control ensures that the gate voltage remains within safe limits under extreme conditions while maximizing switching performance under normal conditions.
4Duration of action of moving object
If a higher gate on voltage is used to shorten mode switching duration, then switching losses are reduced, but switching frequency capability is limited by loss constraints
Solution Approach 1:
The gate on voltage becomes a dynamic parameter that can be adjusted to achieve optimal switching duration without incurring excessive losses. This dynamic adjustment enables the system to operate at higher frequencies by reducing switching duration through voltage optimization, thereby reducing overall switching losses.
Data Source
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AI summary
Embodiments of this application disclose a control circuit, including: a detection module, configured to detect an operating condition of a semiconductor switching device; a determining module, configured to determine a gate allowable voltage of the semiconductor switching device based on the operating condition; and an output module, configured to output a control signal to a driving power supply circuit of the semiconductor switching device based on the gate allowable voltage, to control the driving power supply circuit to provide a gate on voltage that is not higher than the gate allowable voltage and that is positively correlated with the gate allowable voltage for the semiconductor switching device. When the operating condition of the semiconductor switching device becomes better, the gate allowable voltage of the semiconductor switching device is increased. In this case, the control circuit can control the driving power supply circuit to provide an increased gate on voltage that is not higher than the gate allowable voltage for the semiconductor switching device, which is beneficial to shortening mode switching duration of the semiconductor switching device for switching between a full-on mode and a full-off mode while ensuring reliability of the semiconductor switching device, thereby reducing a loss of a switching power supply.