Voltage-Adaptive Gate Drive Resistance for Power Converter Loss
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Solution Overview
Problem
Current power converters face challenges in optimizing drive circuit resistance to meet stress specifications while minimizing losses, as the fixed resistance cannot achieve optimal performance across varying working conditions.
Innovation Solution
A power converter with a drive circuit that adjusts its resistance based on the working condition voltage, switching between different amplification modes to match equivalent drive resistance requirements, allowing for flexible operation and reduced losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive resistance is increased to meet stress specifications, then the stress requirement is satisfied, but the drive circuit loss increases
Solution Approach 1:
The patent applies dynamics by making the drive resistance adjustable rather than fixed. The drive circuit can switch between different resistance values (first resistance value and second resistance value) based on operating conditions. This dynamic adjustment allows the system to use higher resistance when stress specifications require it, and lower resistance when losses need to be minimized, thereby resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent changes the resistance parameter of the drive circuit based on operating conditions. By detecting the operating state and switching between different resistance values, the system optimizes both stress compliance and energy efficiency. This parameter change approach directly addresses the technical contradiction by allowing resistance to vary rather than remaining constant.
2Loss of energy
If the drive resistance is decreased to reduce drive circuit loss, then the energy efficiency is improved, but the stress specification cannot be met
Solution Approach 1:
The drive circuit dynamically adjusts its resistance based on real-time operating conditions. When the system operates under conditions with large stress margin, the drive resistance is reduced to minimize losses. When stress specifications are at risk of being exceeded, the resistance is increased accordingly. This dynamic behavior resolves the contradiction by making resistance adaptive rather than static.
Solution Approach 2:
The patent implements parameter changes by switching the drive resistance between different values based on detected operating conditions. This allows the system to optimize energy efficiency when possible while ensuring stress specifications are always met when necessary, thereby resolving the contradiction between loss reduction and reliability.
3Device complexity
If the drive resistance is fixed, then the circuit structure is simple, but the drive circuit cannot achieve optimal loss while ensuring stress meets specification
Solution Approach 1:
The patent applies segmentation by dividing the drive circuit into multiple parallel branches, each with different resistance values. This allows the system to select the appropriate resistance value for different operating conditions. The segmentation approach maintains relatively simple circuit structure while enabling optimal loss performance through selective activation of different branches.
Data Source
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AI summary
This application provides a power converter, including a power conversion circuit, a drive circuit, and a controller. The drive circuit is connected to the power conversion circuit. The drive circuit is configured to: amplify a control signal from the controller, and drive a switching tube in the power conversion circuit to be turned on or off, to implement power conversion of the power conversion circuit. The controller is configured to: in response to a voltage of the power conversion circuit being greater than or equal to a first threshold, control the drive circuit to be in a first amplification mode; or the controller is configured to: in response to a voltage of the power conversion circuit being less than a first threshold, control the drive circuit to be in a second amplification mode. An equivalent drive resistance of the drive circuit corresponding to the first amplification mode is greater than an equivalent drive resistance of the drive circuit corresponding to the second amplification mode. In this application, the drive circuit may work in a plurality of working modes, and each working mode corresponds to a different equivalent drive resistance, so that the drive circuit can not only meet a stress specification, but also reduce a loss.