DC Power Supply Device with Automatic Voltage Detection and Switching
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Solution Overview
Problem
Conventional DC power supply devices consume power even when not connected to tools, require separate adapters for different voltage tools, and can unexpectedly restart tools during abnormal conditions, leading to inefficiencies and user inconvenience.
Innovation Solution
A DC power supply device with a detection system and switching circuit that adjusts voltage output based on connected tool ratings and detects abnormalities to prevent unexpected startups, incorporating a rectifying circuit, voltage transforming circuit, and a fan for cooling, allowing common connection to multiple voltage tools and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a DC power supply device is connected to an external AC power supply, then the device can output DC power supply, but the internal circuits consume electric power even when not connected to an electrical tool
Solution Approach 1:
The detection part detects the connection state of the electrical tool in advance before the power supply starts. The control part receives this detection result and determines whether to start the power supply accordingly, preventing unnecessary power consumption when no tool is connected
2Reliability
If separate converters and adapters are used for different rated voltages, then each voltage requirement is met, but use of common parts is hindered and device complexity increases
Solution Approach 1:
A single DC power supply device is designed with a switching circuit that can output multiple voltage values (18V, 36V, etc.). The detection part identifies the electrical tool's requirements, and the switching circuit automatically adjusts the output voltage, allowing one device to replace multiple dedicated adapters
Solution Approach 2:
The switching circuit dynamically changes the output voltage based on the detected electrical tool type. The system transitions from static fixed-voltage adapters to a dynamic multi-voltage system that adapts to different tool requirements
3Reliability
If the DC power supply device automatically restarts output after abnormality resolution, then power supply is restored, but unexpected re-start of the electrical tool occurs causing user inconvenience
Solution Approach 1:
The detection part continuously monitors the electrical tool's state including trigger status. When abnormality occurs and is resolved, the control part checks the trigger state before restoring power supply. If the trigger is ON, the power supply remains stopped, preventing unexpected tool startup
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 efficient power supply to tools with varying voltages using common parts, reduces power consumption, and prevents unexpected tool startups during abnormal conditions, enhancing user experience by ensuring safe and efficient operation.
Implementation Method 1
a rectifying circuit and a voltage transforming circuit
Implementation Method 2
a voltage transforming circuit
Implementation Method 3
the fan is arranged in the housing and generates an air flow from the air inlet to the air outlet
Data Source
AI summary
Provided is a DC power supply device If an electrical tool (81) of a rated voltage of 36 V is connected to the DC power supply device (1) (if the voltage of a lower positive terminal indicates the presence of a short bar), a microcomputer (30) performs control so as to switch a switching element (Q1) on and output a DC voltage of 36 V between an upper positive terminal and the upper negative terminal. If an electrical tool (81) of a rated voltage of 18 V is connected to the DC power supply device (1) (if the voltage of the lower positive terminal indicates the absence of a short bar), the microcomputer (30) performs control so as to switch a switching element (Q2) on and output a DC voltage of 18 V between the upper positive terminal and the upper negative terminal.