Power Supply Switch for Electric Working Machine Data Loss Prevention
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Solution Overview
Problem
Existing electric power tools face issues with sudden power shut-offs to the control circuit when the power supply permission signal from the battery pack is lost, which can interrupt critical processes such as data storage or operation, leading to potential data loss and operational disruptions.
Innovation Solution
Incorporating a power supply switch that maintains an ON state for a set period with an ON-command signal from the control circuit after losing the power supply permission signal, and utilizing a differentiating circuit to ensure continued power supply to the control circuit, even when the permission signal is lost, thereby preventing interruptions during processes like data storage or operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power supply to the control circuit is stopped in response to loss of power supply permission signal from the battery pack, then power consumption is reduced and battery protection is achieved, but sudden shut-off interrupts critical processes such as data storage or operation
Solution Approach 1:
The control circuit outputs an ON-command signal to the power supply switch for a set period of time upon detecting loss of the power supply permission signal. This preliminary action maintains power supply to the control circuit even after permission signal loss, allowing critical processes like data storage to complete before power is actually cut off.
2Reliability
If the ON-command signal is continuously output from the control circuit, then power supply is maintained for process completion, but battery protection may be compromised if the control circuit fails
Solution Approach 1:
A differentiating circuit is inserted in the signal transmission path between the control circuit and the power supply switch. This intermediary circuit processes the ON-command signal and automatically shuts off power supply after a predetermined time elapses from the end of the ON-command signal output, even if the control circuit continues to output the signal due to failure. This protects the battery while still allowing sufficient time for critical processes to complete.
Data Source
AI summary
An electric working machine of one aspect of the present disclosure includes a connection port, a control circuit, and/or a power supply switch. The power supply switch is provided on a power supply path extending from a battery pack connected to the connection port to the control circuit. The power supply switch maintains an ON state while a power supply permission signal is output from the battery pack to the electric working machine. The control circuit outputs an ON-command signal to the power supply switch for a specified period of time in response to loss of the power supply permission signal from the battery pack.