Touch Control Circuit Self-Holding Mechanism
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Solution Overview
Problem
Conventional touch switch devices in electronic devices often stop functioning or interrupt operations when the user releases the touch switch, causing inconvenience due to the lack of a self-holding mechanism to maintain power and functionality.
Innovation Solution
A control device comprising a touch sensor circuit, control circuit, driving circuit, and switching circuit that generates a self-holding signal based on the touch state, allowing continuous operation of the device during a set enabling period even after the touch input is released, by using a switching circuit to maintain power to the control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional touch switch is used to control power supply, then the device can be activated when the user presses the touch switch, but the device stops or interrupts operation when the user releases the touch switch, causing inconvenience
Solution Approach 1:
The patent implements a self-holding mechanism where the control circuit maintains the drive signal output after the touch input is released. The control circuit includes a holding unit that preserves the drive signal state, allowing the switching circuit to remain in the on-state and continue powering the electronic device without requiring continuous touch input from the user.
Solution Approach 2:
The control circuit automatically maintains its own operational state through the self-holding mechanism. Once activated by a touch signal, the control circuit generates and sustains the drive signal itself without needing continuous external input, enabling the system to service itself and maintain power supply autonomously during the enabling period.
2Duration of action of moving object
If the touch switch continuously outputs trigger signal to maintain operation, then the device can operate continuously, but energy is wasted when the device should be shutting down
Solution Approach 1:
The patent implements a time-based control mechanism where the control circuit operates during a predefined enabling period after touch activation. After this period expires, the control circuit automatically stops outputting the drive signal, turning off the switching circuit and cutting power to the electronic device. This periodic operation pattern ensures the device runs only when needed and shuts down automatically to conserve energy.
Solution Approach 2:
The control circuit is pre-configured with an enabling period timer that automatically triggers the shutdown sequence. Before energy is wasted, the system proactively prepares for power cutoff by counting down the enabling period, ensuring automatic shutdown occurs at the appropriate time without requiring user intervention or continuous energy consumption.
3Duration of action of moving object
If a self-holding mechanism is added to maintain power after touch release, then continuous operation is achieved, but the device complexity increases
Solution Approach 1:
The patent integrates the self-holding functionality directly into the existing control circuit rather than adding a completely separate mechanism. The control circuit combines the touch signal reception, drive signal generation, self-holding, and timing functions into a unified structure, minimizing additional components and reducing overall device complexity while achieving continuous operation after touch release.
Data Source
AI summary
The control device includes a touch sensor circuit, a control circuit, a driving circuit and a switching circuit. The touch sensor circuit is configured to generate a touch signal and a function signal in response to a touch state of a touch component. The control circuit is activated by a first voltage. The control circuit selectivity generates a self-holding signal according to the function signal when it is activated. The driving circuit is configured to generate a drive signal according to the touch signal or the self-holding signal. The switch circuit is turned on by the drive signal so as to provide the first voltage to the control circuit by the turned-on switching circuit. When the control circuit generated the self-holding signal, the control circuit is configured to continuously transmit the self-holding signal to the driving circuit according to the function signal during a first enabling period.