Power Supply Device with Tool-Dependent Current Interruption
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Solution Overview
Problem
Existing power supply devices connected to electric tools face reliability issues due to microcomputer failures, which can lead to inappropriate voltage output and failure to interrupt power supply when required.
Innovation Solution
A power supply device with a secondary battery, an output unit connected to an electric tool, and an identification unit that allows the first interruption part to switch between interrupting the current path based on the type of electric tool connected, independent of a control unit, ensuring reliable voltage output and power supply interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcomputer control is used to identify electric tool type and control output voltage, then voltage output control is achieved, but reliability deteriorates due to microcomputer failure
Solution Approach 1:
The control function is segmented into two independent parts: a first interruption part that automatically interrupts current based on tool type detection without microcomputer involvement, and a second interruption part that handles microcomputer-controlled interruption. This segmentation ensures that voltage output reliability is maintained through the autonomous first interruption part even when the microcomputer fails.
Solution Approach 2:
The first interruption part operates autonomously to detect electric tool type and interrupt current path without requiring microcomputer control. This self-service mechanism ensures that critical safety functions are performed independently of the microcomputer, preventing system-wide failures.
2Reliability
If microcomputer control is used to interrupt power supply, then power supply control is achieved, but reliability deteriorates when microcomputer fails
Solution Approach 1:
The power supply interruption function is divided into two independent interruption parts: the first interruption part that automatically interrupts power based on tool type detection without microcomputer involvement, and the second interruption part that handles microcomputer-controlled power interruption. This ensures reliable power supply control even when the microcomputer fails.
Solution Approach 2:
The first interruption part is designed to preemptively protect the system by automatically detecting tool type and interrupting current path before any potential microcomputer failure can cause harm. This prior cushioning mechanism ensures that critical protection functions are already in place independently of the microcomputer's operational status.
Data Source
AI summary
Provided is a power supply device in which the reliability of a voltage output is improved, and also provided is a system comprising the power supply device and an electric tool. The power supply device (1) is provided with: a secondary battery cell (2a); an output unit connected to an electric tool and supplying the power of the secondary battery cell (2a) to the electric tool; and switching elements (Q1), (Q2) capable of interrupting a current path from the secondary battery cell (2a) to the electric tool. The switching element (Q1) switches whether or not to interrupt the current path not by being controlled by a control circuit (12) but in accordance with whether the electric tool connected to the output unit has a shorting bar (59) or not.