Power Circuit Impedance Detection for Short-Circuit Isolation
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Solution Overview
Problem
Conventional short current protection methods in computer systems do not provide adequate protection for the power supply terminal, leading to potential damage from large currents caused by short circuits, resulting in increased maintenance costs.
Innovation Solution
A power circuit with a short current protection function, comprising a power connector, a charge unit, a short current protection circuit, and a first switch circuit, which detects impedance at the input and output ends to generate control signals for the switch circuit, preventing continuous large currents during short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional under voltage protection mechanism is used to detect short circuit at output end, then short circuit protection function is provided for output end, but short circuit protection function is not provided for power supply terminal and other components may be damaged by large current
Solution Approach 1:
The patent applies preliminary action by detecting impedance changes at the power supply terminal before a short circuit causes damage. The detection circuit monitors impedance in real-time, and when a short circuit is detected (impedance drops below threshold), the control circuit proactively cuts off power supply through the switch circuit, preventing large current from damaging other components rather than waiting for voltage drop at output end
Solution Approach 2:
The patent introduces an intermediary detection circuit and control circuit between the power supply terminal and the charge unit. This intermediary system monitors impedance changes and mediates the power flow by controlling the switch circuit, enabling early detection and isolation of short circuits before they propagate to damage other components in the system
2Measurement precision
If power supply is continuously supplied to detect impedance changes, then real-time short circuit detection is enabled, but power consumption increases and protection response may be delayed
Solution Approach 1:
The patent implements continuous impedance detection at the power supply terminal by maintaining the detection circuit active throughout operation. The detection circuit continuously monitors impedance changes without interruption, ensuring real-time detection of short circuit conditions while the control circuit responds immediately when impedance drops below the threshold, maintaining continuous protection capability
Solution Approach 2:
The detection circuit utilizes the existing power supply voltage and impedance characteristics of the system to perform self-diagnosis. By monitoring impedance changes caused by short circuits, the system serves its own protection needs without requiring external monitoring equipment, and the switch circuit automatically executes protection actions based on detection signals
Data Source
AI summary
A power circuit, adapted to supply power to a computer system, includes a power connector, a charge unit, a short current protection circuit, and a first switch circuit. The power connector is configured to connect to the adapter to receive an input voltage. The charge unit includes an input end configured to receive the input voltage and an output end. The charge unit converts the input voltage into a system voltage. The short current protection circuit includes a detection circuit and a first logic control circuit. The detection circuit detects an impedance of at least one of the input end and the output end to generate a detection signal. The first logic control circuit generates a power control signal according to the detection signal. The first switch circuit is connected between the power connector and the input end and is controlled by the power control signal.