Power On/Off Circuit Using Capacitive Sensor Isolation
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Solution Overview
Problem
Existing power on/off circuits in battery-powered products fail to shut down properly due to continuous power-on signals from unre reset sensors, leading to high standby current and reduced battery life.
Innovation Solution
Incorporating a capacitor and, in some embodiments, a control chip and diodes, to isolate the sensor's control signal from the switch element, allowing independent control of the circuit's on/off state, even when the sensor is not reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sensor is used as a starting element to control power on/off, then power-on operation is achieved, but the circuit cannot be disconnected when the sensor is not reset, leading to large standby current
Solution Approach 1:
The patent introduces a capacitor as an intermediary element between the sensor and the switch element. The capacitor couples the control signal from the sensor to the switch element, enabling the switch to respond to sensor output while allowing independent control. This intermediary structure breaks the direct dependency, enabling the circuit to be disconnected even when the sensor remains in a non-reset state, thereby reducing standby current.
2Reliability
If the sensor continuously outputs power-on signal, then the circuit remains conducted, but battery usage time is reduced
Solution Approach 1:
The patent segments the control system into independent components: the sensor, the capacitor, and the switch element. This segmentation allows the switch element to be controlled independently from the sensor state. The capacitor holds the control signal state, enabling the switch to remain conductive or non-conductive based on the stored signal rather than continuous sensor output. This resolves the contradiction by allowing reliable circuit conduction when needed while preventing continuous conduction that would drain the battery.
3Stability of the object's composition
If the sensor is not reset, then the power-on signal continues, but the power on/off circuit fails to shut down
Solution Approach 1:
The capacitor performs preliminary action by storing the control signal state before the sensor needs to be reset. When the sensor outputs a power-on signal, the capacitor charges and maintains this state. This preliminary storage of the control signal allows the switch element to be turned off independently of the sensor's subsequent state, enabling proper shutdown operation even when the sensor remains unreset.
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
Prevents continuous conduction of the power on/off circuit, reducing standby current and extending battery life by ensuring proper shutdown.
Implementation Method 1
a second capacitor C2, configured to control the on-off of the first switch element Q1 according to the first control signal SW1
Data Source
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AI summary
This application provides a power on/off circuit and an electronic vaporization device, including a sensor (21), a first switch element (Ql), and a capacitor (C2). The sensor (21) generates a corresponding first control signal (SW1) based on a user operation; a first end of the first switch element (Ql) is connected to a voltage input end (VI), a second end of the first switch element (Ql) is connected to a voltage output end (V2), where the voltage input end (V1) is connected to a power supply voltage; and the capacitor (C2) is connected between a third end of the first switch element (Ql) and the sensor (21), and controls whether the first switch element (Ql) conducts the power on/off circuit based on the first control signal (SW1), which can prevent the power on/off circuit from being continuously conducted and failing to shut down when the sensor (21) is not reset.