Power Semiconductor Drive Circuit for Loss-Noise Balancing
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Solution Overview
Problem
Existing power semiconductor elements face a trade-off between loss and noise, where improving one characteristic often deteriorates the other, and existing methods to reduce noise increase loss, complicating efficient power conversion.
Innovation Solution
A power semiconductor element drive adjustment circuit that includes a voltage detection unit, current detection unit, differentiating unit, normalizing unit, difference unit, comparison unit, drive control unit, and drive variable circuit to adjust the drive signal based on normalized differential values of collector-emitter voltage and current, allowing for simultaneous reduction of loss and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the differential value of voltage or current is reduced for noise reduction, then noise characteristic is improved, but loss increases
Solution Approach 1:
The patent segments the control of voltage and current by treating them separately through individual differentiation and normalization processes. The voltage differential value and current differential value are processed independently through各自的 normalization units, then combined through a difference unit. This segmentation allows optimized control of each parameter to achieve both noise reduction and loss reduction simultaneously
Solution Approach 2:
The patent applies parameter changes by normalizing the differential values of voltage and current through division operations. The normalization units divide the differential values by reference values (dVref and dIref) to create normalized parameters that can be compared and controlled independently. This parameter transformation enables the system to reduce both noise and loss by optimizing the drive signal based on normalized differential relationships
2Loss of energy
If only either one of the load path voltage or current is controlled, then loss is reduced, but noise characteristic deteriorates
Solution Approach 1:
The patent merges the control of voltage and current by combining their normalized differential values through a difference unit. The normalized voltage differential (dVce/dt normalized) and normalized current differential (dIc/dt normalized) are subtracted to generate a comprehensive error signal that reflects both parameters. This merging enables simultaneous optimization of both voltage and current control, achieving both loss reduction and noise reduction together rather than sacrificing one for the other
Data Source
AI summary
A power semiconductor element drive adjustment circuit is provided with a difference unit to calculate a difference value between a normalized value of the differential value of the collector-emitter voltage and a normalized value of the differential value of the collector current, a comparison unit to compare the difference value with a comparison reference value, a drive control unit to generate, on the basis of a comparison result of the comparison unit, a drive adjustment signal that adjusts a drive signal for the power semiconductor element, and a drive variable circuit to output, on the basis of the drive adjustment signal, the drive signal for the power semiconductor element.