Adaptive Drive Resistance in Power Converters for Stress-Loss Balance
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Solution Overview
Problem
Existing power converters face challenges in optimizing drive circuit resistance to meet stress specifications while minimizing losses, as the fixed resistance limits the ability to adapt to varying working conditions.
Innovation Solution
A power converter with a drive circuit that adjusts its resistance based on the working condition voltage, utilizing a controller to switch between different amplification modes, allowing the equivalent drive resistance to change accordingly, thereby meeting stress requirements and reducing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive resistance is increased to reduce stress on the power conversion circuit, then the stress specification is met, 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 dynamically switch between a first drive resistance and a second drive resistance based on working conditions. When stress risk is high, the circuit switches to the first drive resistance (larger value) to meet stress specifications. When stress risk is low, it switches to the second drive resistance (smaller value) to reduce drive circuit loss, thereby resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent changes the resistance parameter of the drive circuit based on working conditions. By switching between different resistance values (first drive resistance and second drive resistance), the system adapts to varying stress margins. This parameter change allows the circuit to optimize both stress compliance and energy efficiency under different operating scenarios.
2Device complexity
If the drive resistance is fixed, then the drive circuit structure is simple, but it cannot achieve optimal loss while ensuring stress meets specification
Solution Approach 1:
The patent introduces dynamic adjustability to the drive resistance through switching circuits that can transition between different resistance values. This dynamic capability allows the system to optimize energy loss under different working conditions while maintaining a relatively simple overall structure through modular switch design and control logic.
Data Source
AI summary
A power converter including a drive circuit connected to a power conversion circuit. The drive circuit is configured to: amplify a control signal from the controller, 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.