Control device, pump unit, and refrigerant circulation device
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Solution Overview
Problem
The length of the power-on delay time in conventional RAID systems for disk drives is not well-defined, leading to inefficiencies in power supply to load devices.
Innovation Solution
A control device with a first connector, power supply path, load switch, protection circuit, and control circuit that includes a capacitor to manage power supply timing based on charging time, ensuring stable and efficient power delivery to load devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power is supplied immediately upon connection detection, then power supply speed is improved, but inrush current damages the load switch
Solution Approach 1:
The protection circuit performs preliminary action by detecting connection before power supply and pre-charging the capacitor to prepare for controlled power delivery, preventing inrush current while enabling rapid subsequent power supply
Solution Approach 2:
The capacitor in the protection circuit acts as an intermediary element between the power source and load switch, absorbing inrush current through its charging process and enabling controlled power transfer to the load device
2Reliability
If power-on delay time is extended to prevent inrush current, then load switch protection is improved, but power supply efficiency deteriorates
Solution Approach 1:
The protection circuit serves itself by using its own capacitor charging process to naturally limit inrush current, eliminating the need for external delay circuits or additional protection components
Solution Approach 2:
The circuit changes the timing parameter dynamically by using the capacitor's charging characteristics to automatically adjust the effective delay time based on the actual power demand and connection state
3Reliability
If connection stability is ensured before power supply, then system reliability is improved, but power supply response time increases
Solution Approach 1:
The control circuit performs preliminary detection of connection state and capacitor charge status before enabling power supply, ensuring stable connection while minimizing delay through pre-validation of power path integrity
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
Enables rapid and controlled power supply to load devices while preventing inrush currents, stabilizing the connection state before full power delivery, and ensuring early but safe operation of motors.
Implementation Method 1
The protection circuit includes at least a capacitor
Data Source
AI summary
A technology of starting power supply from an external device to a load device in a shorter period, after detection of connection between the external device and the load device, is provided. A control device includes a first connector attachable to and detachable from an external device, a power supply path to electrically connect a load device and the first connector, a load switch to switch between connection and disconnection of the power supply path, a protection circuit to protect the load switch from an inrush current to the load switch, the protection circuit including at least a capacitor, and a control circuit. The control circuit is operable to switch the load switch from disconnection to connection after a total time of a preset set time and a first time based on a charging time of the capacitor which has elapsed since connection of the first connector to the external device was detected.