Gate Drive Delay Circuit for IGBT Turn-On Timing Alignment
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Solution Overview
Problem
Existing semiconductor devices face challenges in reducing switching noises and maintaining consistent operation waveforms due to variations in turn-on periods and operating temperatures, particularly when different IGBTs are used for each phase in AC power conversion.
Innovation Solution
A semiconductor apparatus with a temperature detection unit and a delay circuit that adjusts the driving current magnitude based on IGBT operating temperature, and incorporates a delay circuit to align the turn-on periods with a reference period, using a delay unit, reference period storage, and difference calculation to minimize variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the magnitude of driving current is changed according to operating temperature, then switching noises are reduced, but turn-on period variations increase
Solution Approach 1:
The delay circuit performs preliminary adjustment of the drive signal timing based on the operating temperature before the IGBT switching occurs. By calculating the required delay time in advance and applying it to the drive signal, the system compensates for temperature-induced turn-on period variations, ensuring consistent switching characteristics across different operating conditions.
Solution Approach 2:
The system dynamically changes the delay time parameter of the drive signal based on the detected operating temperature. The delay circuit adjusts this parameter in real-time to compensate for temperature effects on IGBT turn-on characteristics, thereby maintaining consistent turn-on periods despite temperature variations and current magnitude changes.
2Adaptability or versatility
If different IGBTs are used for each phase, then adaptability is improved, but turn-on period consistency deteriorates
Solution Approach 1:
The delay circuit applies individualized delay time adjustments to each phase's IGBT based on its specific operating characteristics and temperature. By treating each phase independently with customized delay parameters, the system accommodates differences between IGBTs while maintaining overall consistency in turn-on periods across all phases.
Solution Approach 2:
The system incorporates temperature detection for each phase and uses this feedback to dynamically adjust the delay time for each corresponding IGBT. This closed-loop approach ensures that each phase's turn-on period is optimized based on its actual operating conditions, maintaining consistency despite using different IGBTs.
Data Source
AI summary
Provided is a delay circuit which delays a control signal and outputs the control signal to a gate drive circuit of a semiconductor device, the delay circuit includes a delay unit which delays the control signal such that a time lag between a timing of change in the control signal and a timing of change in a drive signal supplied from the gate drive circuit to a gate of the semiconductor device is brought closer a predetermined reference period.