Power Converter Fault Protection Controller Circuit
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Solution Overview
Problem
Existing power converter controllers either require manual restart after faults or lack efficient auto-retry mechanisms, and often need additional selection pins for fault protection modes, which complicates their operation and reliability.
Innovation Solution
A fault protection controller circuit that integrates two shut down modes and a fault detection module, allowing for automatic restart and selection between latched and auto-retry protection without additional pins, by controlling the switch operation based on input voltage and current thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latched fault protection is implemented by stopping the controller and waiting for manual startup, then reliability is improved by preventing operation during fault conditions, but loss of time increases due to manual intervention requirements
Solution Approach 1:
The controller automatically detects fault conditions and executes shutdown sequences without external intervention. The system monitors its own operational parameters, identifies anomalies, and triggers protective actions autonomously, eliminating the need for manual fault response while maintaining reliable fault protection.
Solution Approach 2:
The controller pre-configures multiple shutdown modes (first and second shutdown modes with different current levels) that are activated based on detected fault severity. By having these protective mechanisms prepared in advance and automatically selectable, the system responds to faults immediately without waiting for manual intervention, reducing downtime while ensuring reliable protection.
2Loss of time
If auto retry protection is implemented to automatically restart the controller after faults, then loss of time is reduced by eliminating manual restart, but reliability may worsen by potentially restarting during persistent fault conditions
Solution Approach 1:
The controller continuously monitors operational parameters and fault conditions after restart attempts. If fault conditions persist after an automatic restart, the system detects the continued anomaly and prevents further restart cycles, instead maintaining a shutdown state. This feedback mechanism ensures that auto-retry protection does not compromise reliability by repeatedly restarting during persistent fault conditions.
Solution Approach 2:
The controller dynamically adjusts its response based on fault persistence. It transitions between operational states (normal operation, first shutdown mode, second shutdown mode) based on real-time fault detection. This dynamic behavior allows automatic restart when appropriate while preventing restart when faults persist, optimizing both downtime reduction and reliability maintenance.
3Adaptability or versatility
If selectable fault protection mode is implemented by adding an extra input pin, then adaptability is improved by allowing mode selection, but device complexity increases due to additional pins and configuration requirements
Solution Approach 1:
The controller integrates multiple fault protection modes (first shutdown mode with lower current, second shutdown mode with higher current) within a single device architecture. The system universally supports both latched and auto-retry protection approaches, and can adapt to different operational requirements without requiring additional physical pins or external configuration components, thereby reducing device complexity while maintaining adaptability.
Data Source
AI summary
A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.