Power Switching Circuit with Timer-Based Controller Deactivation
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Solution Overview
Problem
Conventional power switching circuits waste power as the controller must always be activated, regardless of whether the switch outputs power, leading to unnecessary power consumption.
Innovation Solution
A power switching circuit design that includes an output switch, a user switch, a control circuit, and timer circuits to selectively apply activation signals based on the duration of power output, allowing the controller to be deactivated when not needed, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the controller is always activated to control the switch, then the switch can respond immediately to control signals, but the controller continuously consumes power even when not needed
Solution Approach 1:
The circuit performs preliminary action by pre-charging a capacitor through a resistor when the power switch is turned on. This stored energy in the capacitor maintains the control signal for a predetermined time period, allowing the switch to remain active without continuous controller intervention. The preliminary charging action eliminates the need for continuous power supply to the controller during the delay period.
Solution Approach 2:
The circuit implements self-service through the RC time constant formed by the resistor and capacitor. Once the controller initiates the charging process, the circuit automatically maintains itself for the predetermined time period without further controller input. The capacitor discharges through the resistor to sustain the control signal, making the system self-sustaining during the delay period and reducing overall power consumption.
2Use of energy by moving object
If the controller is deactivated to save power, then power consumption is reduced, but the switch cannot respond to control signals in a timely manner
Solution Approach 1:
The controller performs preliminary action by charging the capacitor before deactivating. This pre-charging ensures that when the controller shuts down, the capacitor has sufficient energy to maintain the control signal for the entire predetermined time period. The preliminary action of charging eliminates the control delay that would otherwise occur when the controller is deactivated.
Solution Approach 2:
The capacitor acts as an intermediary between the controller and the power switch. It stores the control signal energy and releases it gradually, bridging the gap between controller deactivation and switch response. This intermediary component ensures continuous control signal delivery without requiring the controller to remain active, thus eliminating control delay while saving power.
Data Source
AI summary
A power switching circuit is disclosed. The power switching circuit includes an output switch coupled to a power supply, a control circuit controlling the first switch to output the power supply according to a voltage of a node, and a user switch for receiving a switch signal. Two clock circuits control the voltage of the node according to the period of the switch signal.