Boost Converter Disconnect Switch for Inrush and Short Isolation
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Solution Overview
Problem
Power converters, particularly switching power converters, face issues with inrush currents during startup and potential damage from short circuits due to uncontrolled energy discharge from inductors, which can lead to component damage and inefficient voltage regulation.
Innovation Solution
A disconnect switch circuit is introduced, operating under analog and digital control modes, to manage inrush currents and isolate the regulated supply voltage node from the boost node during short circuits, using an inductor coupled between the input power supply and a switch node, and a converter circuit to generate a specific voltage level on the boost node, which is then used to provide a regulated power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disconnect switch is added to isolate the regulated supply voltage node from the boost node during short circuits, then component safety is improved, but device complexity increases
Solution Approach 1:
A disconnect switch is introduced as an intermediary component between the regulated supply voltage node and the boost node. This switch acts as a mediator that can isolate the two nodes during short circuit conditions, preventing damage to downstream components while maintaining normal operation during regular conditions.
Solution Approach 2:
The disconnect switch is configured to detect short circuit conditions and activate before damage can occur to downstream components. By monitoring voltage levels and current conditions, the switch opens the isolation path proactively when a short circuit is detected, preventing harmful effects before they propagate through the circuit.
2Reliability
If the disconnect switch operates in analog mode to limit inrush currents, then component protection is improved, but device complexity increases
Solution Approach 1:
The disconnect switch employs an analog control mode that dynamically adjusts its resistance characteristic based on real-time current conditions. During startup, the analog controller modulates the switch to limit inrush currents, providing continuous protection against current surges that could damage components.
Solution Approach 2:
The control circuit changes the operating parameters of the disconnect switch by switching between analog and digital control modes. In analog mode, the switch operates with continuous parameter adjustment to smoothly limit inrush currents, rather than abrupt on/off switching, thereby protecting components during transient conditions.
3Reliability
If voltage regulation is implemented to reduce boost node voltage during regulation events, then voltage stability is improved, but response time increases
Solution Approach 1:
The output circuit is configured to detect regulation events by monitoring voltage levels on the regulated supply voltage node. When a regulation event is detected, the circuit provides feedback to the disconnect switch to reduce the boost node voltage, establishing a closed-loop control system that maintains voltage stability through continuous monitoring and adjustment.
Data Source
AI summary
A disconnect switch for a power converter is disclosed. An apparatus includes an inductor coupled between an input power supply node and a switch node, and a converter circuit configured to generate a particular voltage level on a boost node using a voltage level of the switch node. An output circuit is configured to provide the particular voltage level on the regulated power supply node using a voltage level of the boost node. In response to a determination that the regulated power supply node has been shorted to ground, the output circuit is configured isolate the boost node from the regulated power supply node. In response to a detection of a regulation event, the output circuit is configured to reduce the voltage level of the boost node to generate a reduced voltage on the regulated power supply node.