Power Converter Gate Signal Control for Overcurrent Protection
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Solution Overview
Problem
Conventional power converter controlling apparatuses fail to reliably protect high-capacity switches from overcurrent and overvoltage, leading to potential burnout due to heat generation, with existing protection methods being limited in reliability and increasing costs.
Innovation Solution
A digital power converter controlling apparatus that includes a detector for generating a signal in response to overcurrent and overvoltage, a registration maintenance unit to shut off gate signals, and a registration revocation unit to control the shut-off state, utilizing a silicon controlled rectifier and Zener diode to prevent heat generation by automatically shutting off gate signals when overcurrent or overvoltage is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermosensor or program is used to protect the main switch from overcurrent and overvoltage, then the switch is protected from heat generation, but the reliability is limited and costs increase
Solution Approach 1:
The patent replaces the mechanical/thermal protection system (thermosensor) with an electrical field-based protection system using a detector circuit that monitors current and voltage conditions electrically, eliminating the need for thermal sensing components and their associated reliability limitations
Solution Approach 2:
The patent introduces a detector circuit as an intermediary component that senses overcurrent and overvoltage conditions and triggers the protection mechanism, providing a more reliable and cost-effective mediation between the power converter and the protection response compared to direct thermosensor monitoring
2Productivity
If the main switch operates under overcurrent conditions, then power conversion continues, but the switch heats up and may burn out within tens of minutes or seconds
Solution Approach 1:
The patent implements preliminary protection action by detecting overcurrent and overvoltage conditions before they cause thermal damage to the main switch, automatically shutting off the gate signal to prevent burnout and ensure switch durability
Solution Approach 2:
The patent employs feedback control where the detector continuously monitors the electrical conditions and provides feedback to the control circuit, which adjusts the gate signal accordingly to maintain switch reliability while enabling continuous power conversion operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents burnout by automatically shutting off gate signals in response to overcurrent and overvoltage, enhancing reliability and reducing the risk of part exchange in high-capacity power converter operations.
Implementation Method 1
a detector which generates a detection signal in response to generation of overcurrent and/or overvoltage... utilizing a silicon controlled rectifier and Zener diode
Implementation Method 2
The generation of heat degrades the main switch 53 to be burnt out... effectively prevents burnout by automatically shutting off gate signals
Data Source
AI summary
A power converter controlling apparatus that can prevent burnout caused by overcurrent and/or overvoltage generated by low power index operation or output short circuit in a high frequency power converter employing a digital controlling method, and a method thereof. The power converter controlling apparatus includes a digital controller which outputs a gate signal for controlling intermittent operation of a predetermined switch based on inputted control data, a detector which generates a detection signal in response to generation of overcurrent and/or overvoltage, and a registration maintenance unit for maintaining a state where the output of the gate signal is shut off, when the detection signal is generated.