Dual-Battery Power Tool Circuit With Backflow Suppression
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Solution Overview
Problem
Existing electric power tools with a single battery face challenges in providing sufficient working time due to power consumption by both the electric motor and communication device, and built-in power supplies are inefficient when sharing a power line with the motor.
Innovation Solution
The electric power tool is designed with a dual battery system, where a first battery powers the motor and a second battery powers the communication device, with a backflow suppression circuit to prevent power loss from the secondary battery to the primary battery, ensuring efficient use of both batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single battery is used to power both the electric motor and communication device, then the device complexity is reduced, but the working time is insufficient due to power consumption by both components
Solution Approach 1:
The power supply system is segmented into two independent batteries: a first battery dedicated to powering the electric motor and a second battery dedicated to powering the communication device. This segmentation allows each battery to independently support its respective component, thereby extending the overall working time of the power tool without increasing system complexity significantly.
2Duration of action of moving object
If a built-in power supply is added to the electric power tool, then the working time is extended, but the built-in power supply is inefficiently used when sharing a power line with the electric motor
Solution Approach 1:
The power supply system is segmented into two independent batteries: a first battery dedicated to powering the electric motor and a second battery dedicated to powering the communication device. This segmentation allows each battery to independently support its respective component, thereby extending the overall working time of the power tool without increasing system complexity significantly.
Solution Approach 2:
A backflow suppression circuit is introduced as an intermediary component between the first and second batteries. This circuit prevents power loss from the second battery to the first battery through the voltage line, ensuring that each battery's energy is used efficiently for its intended purpose and preventing wasteful power flow.
3Duration of action of moving object
If a second battery is added to power the communication device, then the working time is extended, but the device complexity increases
Solution Approach 1:
The voltage supply system is designed to be universal, with the first voltage supply portion capable of supplying power to both the electric motor and the communication device. The second voltage supply portion is configured to supply power to the communication device and can also charge the first battery when the motor is not operating. This multi-functionality reduces the need for separate dedicated circuits for each battery, thereby limiting the increase in device complexity.
4Duration of action of moving object
If the first battery is removed to extend working time, then the communication device can still operate with the second battery, but power loss occurs without backflow suppression
Solution Approach 1:
A backflow suppression circuit is introduced as an intermediary component between the first and second batteries. This circuit prevents power loss from the second battery to the first battery through the voltage line, ensuring that each battery's energy is used efficiently for its intended purpose and preventing wasteful power flow.
Data Source
AI summary
There is provided an electric power tool including: a second voltage supply portion configured to supply, based on a first power supply voltage supplied from a first battery, a second operating voltage for operating a second controller, and configured to supply, based on a second power supply voltage supplied from a second battery, the second operating voltage for operating the second controller; a first voltage line configured to connect a first voltage supply portion and the second voltage supply portion and configured to supply the first power supply voltage; and a backflow suppression circuit configured to permit a current to flow from the first voltage supply portion to the second voltage supply portion in the first voltage line and configured to suppress a current from flowing from the second voltage supply portion to the first voltage supply portion in the first voltage line.