IGBT Shutdown Circuitry Verification via Short Test Pulse
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Solution Overview
Problem
Existing methods for verifying the shutdown circuitry of power modules in electrical power converters and inverters can be disruptive and stressful, potentially leading to equipment degradation or failure, especially in motor drives where rapid power interruptions cause voltage spikes that damage insulation.
Innovation Solution
A system and method that utilize a short duration shutdown test pulse to verify the operability of shutdown circuitry, minimizing electrical stress on motor windings by ensuring the test pulse duration is shorter than the latency period of opto-couplers, allowing the inverter module to continue generating power unaffected during the test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shutdown test pulse is used to verify the operability of shutdown circuitry, then the shutdown circuitry can be tested for proper operation, but electrical stress on motor windings increases and equipment degradation may occur
Solution Approach 1:
The patent changes the duration parameter of the shutdown test pulse to be extremely short (shorter than the opto-coupler latency period). This parameter change allows the test to verify shutdown circuitry operability while minimizing the duration of voltage spikes and electrical stress on motor windings, thus resolving the contradiction between testing reliability and preventing equipment degradation
Solution Approach 2:
The patent implements a rapid test pulse that skips through the critical period where damage could occur. By completing the shutdown test action faster than the opto-coupler response time, the system verifies circuitry operability without allowing sufficient time for harmful voltage spikes to cause equipment degradation
2Measurement precision
If the shutdown test pulse duration is extended to ensure proper verification, then measurement precision improves, but equipment damage risk increases
Solution Approach 1:
The patent uses the opto-coupler latency period as an intermediary time window. By timing the shutdown test pulse to be shorter than this latency period, the system achieves measurement precision through the opto-coupler's natural response characteristics while the intermediate time buffer prevents equipment damage by limiting exposure to stress conditions
3Reliability
If a full shutdown test is performed to meet industry requirements, then compliance with safety standards is achieved, but production equipment disruption increases
Solution Approach 1:
The patent applies partial action by performing a shortened shutdown test that is sufficient to meet safety standard compliance requirements without executing a complete full shutdown sequence. This partial test action verifies the critical safety function while minimizing disruption to production equipment operation and maintaining productivity
Data Source
AI summary
A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for shortening the duration of a shutdown test pulse, such that the power output to the load is substantially unaffected.