Electric Tool Power Circuit for Dual Voltage Adaptation
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Solution Overview
Problem
Existing electric tools are limited in their ability to operate effectively with different voltage inputs, particularly when transitioning from alternating current to direct current power supplies, leading to inconvenience and reduced functionality when power sources vary.
Innovation Solution
An electric tool design featuring a motor with three phase windings and a power circuit that selectively connects alternating current and direct current power supplies, utilizing a connecting circuit with switches and a signal source to adjust the winding connections between anode and cathode, forming either a Y-shaped or triangle-shaped configuration depending on the power source, ensuring consistent output properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electric tool is designed to work with alternating current power supply, then it can operate in places with power sockets, but it cannot be used away from sockets and has limited mobility
Solution Approach 1:
The electric tool is designed with a universal power interface that accepts both alternating current (mains power) and direct current (battery power) inputs. The power circuit includes switching elements and control logic that automatically detect the power source type and reconfigure the motor winding connections accordingly, enabling the same tool to function with multiple power supply types without requiring separate tools for different power sources.
2Adaptability or versatility
If the electric tool is designed to work with direct current power supply, then it can be used away from power sockets, but the electric energy reserve is limited and requires frequent battery replacement or recharging
Solution Approach 1:
The power circuit incorporates dynamic switching elements (such as transistors or thyristors) that can rapidly change the connection configuration of the motor windings based on the detected power source type. When alternating current is detected, the circuit reconfigures the windings in a star connection pattern; when direct current from a battery is detected, it reconfigures them in a delta connection pattern. This dynamic adaptation allows the tool to optimize its performance and operational duration for each power source type.
3Adaptability or versatility
If the power circuit is designed to selectively connect different power supplies, then the electric tool can adapt to different voltage inputs, but the device complexity increases due to additional switching elements and control circuits
Solution Approach 1:
The power circuit design merges the functions of power switching, voltage detection, and motor control into a single integrated circuit module. The switching elements are arranged in a compact configuration where multiple functions share common components. For example, the same switching transistors used for power control also serve as detection elements for identifying the power source type, and the control logic for winding reconfiguration is combined with the motor drive circuitry, thereby reducing overall system complexity.
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 the electric tool to maintain consistent output properties when connected to different voltage inputs, enhancing user convenience and operational flexibility while maintaining a compact and cost-effective design.
Implementation Method 1
a motor including a first phase winding, a second phase winding and a third phase winding
Data Source
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AI summary
The present disclosure discloses an electric tool, including: a motor (130) including a plurality of windings; a power circuit (110) configured to selectively access a first power supply (111) and a second power supply (112) for supplying power for the motor (130); a connecting circuit (120) including a switching device configured to enable the connecting circuit to have a first connection state and a second connection state; and a signal source configured to send a first control signal, when the power circuit accesses the first power supply, to the switching device so that the connecting circuit is in the first connection state, and send a second control signal, when the power circuit accesses the second power supply, to the switching device so that the connecting circuit is in the second connection state. The electric tool has basically same output properties when accessing power supplies with different voltages.