Transient Current Suppression Device with Dual Discharging Paths
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Solution Overview
Problem
Conventional transient current suppression devices fail to effectively manage transient currents during frequent switching or hot-plug scenarios, leading to potential damage to electronic components and system malfunctions due to uncontrolled current flow.
Innovation Solution
A transient current suppression device incorporating a filtering circuit, a delayed turn-on circuit, and a forcibly electrical discharging circuit, which provides additional discharging paths to manage transient currents, preventing immediate flow back to the power circuit by utilizing a second discharging path when the first capacitor is not fully discharged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transient current suppression device with a single delayed turn-on circuit is used, then the circuit design is simple, but the device fails to effectively suppress transient current during frequent switching or hot-plug scenarios
Solution Approach 1:
The suppression device is divided into multiple independent functional modules: a first delayed turn-on circuit with first and second transistors, a second delayed turn-on circuit with third and fourth transistors, each having distinct time constants. This segmentation allows each module to handle different switching scenarios independently, improving suppression effectiveness without creating a single point of failure
Solution Approach 2:
The circuit performs preliminary charging of capacitors during the first power-on or hot-plug event, preparing the delayed turn-on circuits in advance. When frequent switching occurs, the pre-charged capacitors enable the transistors to activate at precisely timed intervals, ensuring transient current is suppressed before it can affect the power circuit
2Speed
If the first capacitor is not fully discharged during frequent switching, then the first transistor turns on immediately causing transient current to flow back to the power circuit, but extending discharge time delays suppression response
Solution Approach 1:
The circuit employs dynamic control where the first transistor is activated immediately when its capacitor discharges, while the second transistor provides a staged response with a different time constant. This dynamic multi-stage approach allows the system to adapt to varying discharge conditions, ensuring rapid suppression without compromising reliability
Solution Approach 2:
The suppressed transient current is redirected through periodic discharging paths controlled by the two transistors with different time constants. This periodic action through multiple channels ensures that current is continuously managed throughout the discharge period, preventing any single moment of uncontrolled current flow
3Reliability
If multiple transistors and delayed turn-on circuits are added to handle frequent switching, then transient current suppression improves, but the device complexity increases
Solution Approach 1:
Each delayed turn-on circuit module serves multiple functions: it handles both initial power-on scenarios and frequent switching events, manages different capacitor discharge rates, and provides redundant suppression paths. This multi-functionality reduces the need for entirely separate circuits for different scenarios
Solution Approach 2:
The invention changes the time constant parameter of the RC circuits by using different resistor and capacitor values in the two delayed turn-on circuits. This parameter variation allows the circuits to respond at different rates to the same input signal, providing effective suppression across different switching frequencies without adding complex control logic
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
The solution effectively reduces transient current peaks by approximately 50% without affecting stable current, thereby protecting the power circuit and preventing system shutdowns during frequent switching or hot-plug events.
Implementation Method 1
the capacitor C is in short circuit at this instant... the capacitor has no internal resistance or very small internal resistance... the first capacitor C1 still contains electricity
Implementation Method 2
the filtering circuit 11 includes a capacitor C and a diode D... the first power signal V1 flows through the diode D and then charges the capacitor C
Data Source
AI summary
A transient current suppression device, which is applied to a fan, includes a filtering circuit, a delayed turn-on circuit and a forcibly electrical discharging circuit. The filtering circuit outputs a first voltage signal and a first current signal according to a first power signal. The delayed turn-on circuit is electrically connected with the filtering circuit. The delayed turn-on circuit provides a first discharging path for the first current signal according to a second power signal after a delayed time and outputs a second current signal. The forcibly electrical discharging circuit is electrically connected with the delayed turn-on circuit and the filtering circuit. The forcibly electrical discharging circuit provides a second discharging path for the second current signal according to the first voltage signal. Hence, the transient current suppression device can suppress the transient current effectively and rapidly.