Multiphase VRM Short Circuit Detection
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Solution Overview
Problem
High-speed switching in power supply circuits for electronic devices, such as computers and servers, leads to premature deterioration and potential combustion of switching elements due to simultaneous turning on of upper and lower FETs, causing short circuits and damage.
Innovation Solution
An electronic apparatus with a controller and power supply system that detects simultaneous turning on of upper and lower switching elements, generating a control signal to turn off the unit converters and prevent operation, using a short detector with reference voltages and comparators to intercept input power and disable switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed switching (1 MHz) is performed to reduce arrangement space and improve performance, then power supply efficiency and compactness are improved, but switching elements deteriorate and cause short circuits due to simultaneous turning on of upper and lower FETs
Solution Approach 1:
The patent applies preliminary action by detecting the short-circuit moment between upper and lower FETs before it causes damage. The short detector monitors the switching states and identifies when both FETs are simultaneously on, allowing the controller to preemptively adjust switching phases and prevent combustion of switching elements while maintaining high-speed operation
Solution Approach 2:
The patent implements feedback through the short detector that continuously monitors switching element states and provides feedback to the controller. When a short-circuit condition is detected, the controller adjusts the switching phases of multiphase converters to eliminate the simultaneous on-state, creating a closed-loop control system that maintains reliability during high-speed switching
2Area of stationary object
If switching frequency is heightened to 1 MHz to reduce filter component size, then arrangement space is reduced, but unwanted voltage is generated at gate terminal due to parasitic inductance components
Solution Approach 1:
The patent converts the harmful effect of parasitic inductance into a useful detection mechanism. The unwanted voltage generated at the gate terminal due to parasitic inductance during simultaneous switching is detected by the short detector, which uses this voltage signal to identify the short-circuit moment and trigger phase adjustment, thereby transforming a harmful phenomenon into a protective function
3Power
If upper and lower FETs are simultaneously turned on to control large current, then current control capability is improved, but short circuit occurs for several tens or hundreds of nanoseconds causing damage to FETs
Solution Approach 1:
The patent applies the skipping principle by rapidly detecting and responding to the short-circuit moment. The short detector identifies when upper and lower FETs are simultaneously on, and the controller quickly adjusts switching phases to skip through the dangerous state before it causes cumulative damage, allowing the system to maintain high current control capability while preventing FET deterioration over time
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
Prevents combustion and shutdown of switching elements by promptly detecting and addressing short circuits, ensuring stable operation and extending the lifespan of switching elements in high-integration multiphase VRM systems.
Implementation Method 1
a short detector configured to detect whether the upper and lower switching elements are simultaneously turned on in the plurality of unit inverters
Data Source
AI summary
An electronic apparatus, a power supply apparatus, and a power supply method. The electronic apparatus may include a controller to provide a control signal to generate a multiphase signal through conversion of an input power and to receive a feedback of an output voltage that is generated using the multiphase signal; and a power supply including a plurality of unit converters having upper and lower switching elements of a half or full-bridge type, being operated by the control signal, and configured to provide the output voltage by the multiphase signal generated according to driving of the plurality of unit converters, wherein the power supply detects whether the upper and lower switching elements are simultaneously turned on in the plurality of unit inverters and turns off the operation of the unit converters according to the detection result.