Integrated Switch PCB Layout for Compact Brushless Tool Control
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Solution Overview
Problem
Conventional power tools with brushless DC motors face challenges in compact design and assembly complexity due to separate electrical switching contacts, signaling, and control modules, which occupy more space and require additional assembly time and cost.
Innovation Solution
An integrated electrical switch unit with a housing, actuator, signaling module, and power module, where the signaling and control modules are formed on a single PCB for direct electrical communication, and the power module is on a separate PCB, allowing for compact design and reduced assembly complexity, with optional thermal dissipation and customizable configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrical switching contacts, signaling module, and control module are used, then functional reliability is improved, but device complexity and space occupation increase
Solution Approach 1:
The patent combines the electrical switching contacts, signaling module, and control module onto a single PCB substrate. The switching contacts are mounted on the PCB and electrically connected to the signaling and control circuits through trace pathways, eliminating the need for separate wiring harnesses and reducing assembly steps while maintaining functional integrity.
Solution Approach 2:
The PCB serves multiple functions simultaneously: it acts as the structural substrate for mounting switching contacts, provides electrical connection pathways, hosts the signaling circuitry for detecting trigger position, and contains the control circuitry for regulating motor power. This multi-functional integration reduces the overall component count and assembly complexity.
2Reliability
If separate modules are used for switching, signaling, and control, then functional independence is improved, but space occupation increases
Solution Approach 1:
The patent integrates all three functional modules (switching contacts, signaling module, and control module) onto a single PCB. The switching contacts are mounted on the PCB and connected to the signaling and control circuits through integrated trace pathways, eliminating the need for separate wiring and reducing space requirements while maintaining functional independence through distinct circuit regions.
Solution Approach 2:
The patent utilizes the two-dimensional surface of the PCB to accommodate all functional modules. By arranging the switching contacts, signaling circuits, and control circuits in different regions of the same plane and using layered trace pathways, the design achieves functional independence without increasing the overall footprint, effectively using the PCB's planar dimension to pack multiple functions densely.
3Adaptability or versatility
If multiple separate components are used, then functional capability is improved, but assembly time and cost increase
Solution Approach 1:
The patent combines multiple functional components onto a single PCB assembly. The switching contacts, signaling circuits, and control circuits are all mounted and interconnected on the same substrate, allowing the entire assembly to be installed as one unit rather than multiple separate components, thereby reducing assembly time and labor costs.
Solution Approach 2:
The PCB is pre-configured with all necessary electrical trace pathways, connection points, and mounting locations for the switching contacts and circuit components before final assembly. This preliminary preparation of the PCB layout and routing enables faster final assembly since no complex wiring or interconnections need to be created during the assembly process.
Data Source
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AI summary
An electrical switch unit for use with a variable speed electrical device to control operation of a DC motor of the electrical device, the electrical switch unit comprising: a housing which houses a pair of electrical switching contacts, and, an actuator operably connected with at least one of the pair of electrical switching contacts, a signaling module associated with the electrical switch unit comprising signaling circuitry for sensing the movement of the actuator and outputting a signaling module signal indicative of the sensed movement or position of the actuator; a power module comprising at least one power switching device for controllably supplying power from the DC power source to the DC motor; a control module for receiving the signaling module signal, and for outputting a control module signal to control the power module wherein the at least one power switching device controllably supplies power from the DC power source to the DC motor to allow operation of the DC motor at a speed corresponding to the sensed movement or position of the actuator.