MOSFET Pushbutton Power-On Circuit With Zero Standby Drain
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Solution Overview
Problem
Existing headsets face challenges in conserving power while using pushbutton switches, as they often require continuous power draw from limited power sources, even in low power modes, which can drain batteries quickly.
Innovation Solution
A system utilizing a plurality of normally-open pushbutton switches coupled with MOSFETs, where the interaction between MOSFETs allows the headset to be powered on without initially drawing power from the battery, and the controller identifies which switch was operated to trigger the power-on state, ensuring no power is consumed until the headset is actively used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pushbutton switches are used in headsets, then operator convenience is improved, but continuous power draw from limited power sources worsens battery life
Solution Approach 1:
The patent extracts the power consumption function from the pushbutton switch monitoring system. Instead of continuously monitoring switch states through powered electronic components, the invention uses passive electrical characteristics (capacitive coupling, voltage division) that require no active power draw during low power modes, thereby eliminating the harmful energy consumption while preserving switch functionality.
Solution Approach 2:
The patent introduces intermediary electrical elements (capacitors, resistors forming voltage dividers) that mediate between the pushbutton switches and the controller. These intermediaries enable switch state detection through passive electrical coupling without requiring continuous active monitoring, thus reducing power consumption while maintaining operational capability.
2Loss of information
If electronic components continuously monitor pushbutton switches, then switch identification is enabled, but power consumption increases during low power modes
Solution Approach 1:
The patent implements periodic rather than continuous monitoring. The controller enters low power modes where monitoring is suspended, and only activates monitoring periodically or when triggered by specific events. This periodic action maintains switch identification capability while dramatically reducing average power consumption during extended low power states.
Solution Approach 2:
The patent enables the switch network to self-indicate its state through passive electrical characteristics (voltage levels, capacitive coupling effects) that exist without active power consumption. The electrical configuration itself provides the information about switch states through voltage division and capacitive sensing, eliminating the need for continuous active polling by electronic components.
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
This solution enables headsets to conserve power by avoiding continuous battery drain during low power modes and ensures reliable operation even if the controller is malfunctioning, as the power-on function is independent of the controller's responsiveness.
Implementation Method 1
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
Data Source
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.