Fan System Hot-Swap Control with Delay Circuit
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Solution Overview
Problem
Conventional fan systems face issues with spike noise, inrush current, and reduced terminal contact due to improper swapping, leading to potential damage and poor heat dissipation, especially when starting fans simultaneously without adaptive control methods.
Innovation Solution
A fan system with a connecting device, controlling device, and fan device that receives driving and start signals to generate enabling signals for synchronous or sequential fan starting, incorporating isolation protection to prevent spike noise and inrush current, and using a start controlling unit with switch elements and a delay circuit for controlled fan operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fans are started simultaneously without control, then heat dissipation capability is improved, but inrush current and spike noise damage the system
Solution Approach 1:
The patent applies preliminary action by using a delay circuit to pre-control the timing of fan startup. Before simultaneously starting multiple fans, the system pre-charges capacitors and prepares the driving signals through the delay circuit, ensuring that fans start synchronously without generating harmful inrush current or spike noise. This resolves the contradiction by preparing the system in advance to achieve both heat dissipation and electrical safety.
2Reliability
If hot-swap elements are used for fan replacement, then system reliability is improved, but terminal contact deteriorates due to improper swapping
Solution Approach 1:
The patent introduces an intermediary mechanism - the hot-swap controlling device with isolated grounds - that mediates between the fan replacement operation and the electrical connection. This intermediary structure allows fans to be replaced without breaking electrical continuity, preventing terminal contact deterioration while maintaining system reliability. The isolation circuit acts as a buffer that protects the electrical system during hot-swap operations.
3Object-affected harmful factors
If isolating circuits are added to prevent spike noise, then system protection is improved, but device complexity increases
Solution Approach 1:
The patent merges the isolating circuit function with the existing hot-swap controlling device structure. Instead of adding separate isolating circuits as independent components, the isolation functionality is integrated into the ground structure and control circuitry that already exists in the fan control system. This combining approach provides spike noise protection while minimizing the increase in device complexity.
Data Source
AI summary
A fan system includes a connecting device, a controlling device and a fan device. The connecting device has a plurality of pins receiving at least one driving signal and a start signal. The control device is electrically connected to the pins of the connecting device and has a start control unit. The start control unit generates a first enabling signal in accordance with the start signal. The control device synchronously outputs the first enabling signal and the driving signal. The fan device is electrically connected to the control device and has a plurality of fans. The fan device synchronously transmits the driving signal to the fans and synchronously drives the fans to rotate in accordance with the first enabling signal.