Zero Power Drain Pushbutton Controls for Headsets
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Solution Overview
Problem
Existing pushbutton switches for headsets require continuous power draw from limited power sources, even in low power modes, to monitor and identify user operations, which inefficiency drains the battery and compromises power conservation.
Innovation Solution
A circuit design using a plurality of normally-open pushbutton switches coupled with MOSFETs, where the interaction between MOSFETs and a controller allows the headset to be powered on without initial power draw, enabling identification of which switch was operated to initiate power-on, thus conserving battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pushbutton switches are used for power control in headsets, then operator convenience is improved, but continuous power draw drains the limited battery power source
Solution Approach 1:
The patent extracts the power monitoring and identification function from the main controller, implementing it through a separate MOSFET-based circuit that operates independently of the controller's power state. This allows the pushbutton switches to be monitored without requiring the controller to remain powered, thereby eliminating continuous power draw while maintaining ease of operation.
Solution Approach 2:
The MOSFET circuit serves itself by using the inherent electrical characteristics of the pushbutton switches and MOSFETs to detect switch closure and initiate controller power-on without requiring external monitoring. The circuit automatically latches the controller in a powered state once a switch is activated, eliminating the need for continuous power consumption to maintain switch monitoring capability.
2Measurement precision
If the controller continuously monitors pushbutton switches to identify user operations, then switch identification capability is maintained, but power conservation is compromised
Solution Approach 1:
The patent implements preliminary action by pre-configuring the MOSFET circuit to automatically detect and respond to pushbutton switch closure events. The circuit is designed with pull-up resistors and MOSFET gates positioned to immediately sense when a switch closes, triggering the power-on sequence before the controller would otherwise need to be active. This eliminates the need for continuous monitoring while preserving precise switch identification.
Solution Approach 2:
The MOSFET circuit acts as an intermediary between the pushbutton switches and the controller. It translates mechanical switch closure into electrical signals that automatically power-on the controller, bridging the gap between user input and system response without requiring the controller to remain continuously powered. This intermediary function maintains precise switch identification while enabling power conservation.
3Ease of operation
If electronic components are added to enable pushbutton switching, then switch functionality is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the MOSFET circuit to simultaneously perform multiple functions: detecting pushbutton switch closure, providing latch functionality to maintain controller power-on state, and identifying which specific switch was activated. This consolidation of functions into a single circuit architecture improves ease of operation without proportionally increasing device 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
The solution allows the headset to be powered on without initial power consumption, effectively conserving battery life and ensuring continuous functionality even when the controller is unresponsive, ensuring reliable communication in critical situations.
Implementation Method 1
a first MOSFET having a first gate coupled to each switch of the plurality of switches, and a first source coupled to a high voltage potential terminal of a power source to receive electric power therefrom
Data Source
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AI summary
A plurality of normally-open pushbutton switches are coupled to and cooperate with a pair of MOSFETs to provide each pushbutton switch of the plurality of pushbutton switches with a power on switch function for a personal audio device that does not require power to be drawn from a power source to monitor each of the pushbutton switches or to identify which of the pushbutton switches was manually operated to power on the personal audio device while awaiting operation of one of the pushbutton switches to cause the personal audio device to be powered on.