Switch State Detection Circuit Time-Division Multiplexing
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Solution Overview
Problem
Conventional switch state detection circuits face issues with excessive circuit scale, performance unevenness among detection portions, and high consumed current, especially when detecting multiple switches simultaneously.
Innovation Solution
A switch state detection circuit with a connection line and a connection control portion that switches between multiple switch connection portions, using an electric power adjustment portion to detect switch states based on the connection line's state, and a communication portion to transmit detection results, allowing for efficient detection and reduced current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of detection portions is increased to detect multiple switches, then the detection capability is improved, but the circuit scale becomes excessively large
Solution Approach 1:
Multiple detection portions are merged into a single detection portion by using a time-division multiplexing approach. The connection control portion switches between multiple switch connection portions sequentially, allowing one detection portion to detect states of multiple switches at different time intervals, thereby reducing circuit scale while maintaining detection capability
Solution Approach 2:
The connection control portion implements periodic switching between different switch connection portions, enabling the single detection portion to periodically detect the state of each switch in sequence. This periodic action allows one detection resource to serve multiple switches over time
2Speed
If multiple detection portions are used to detect switch states simultaneously, then the detection speed is improved, but performance unevenness occurs among detection portions
Solution Approach 1:
Multiple detection portions are consolidated into a single detection portion that services all switches sequentially through time-division multiplexing. This ensures uniform performance across all detection operations since the same detection resource is used for every switch, eliminating performance unevenness
3Measurement precision
If constant current is used to detect multiple switches simultaneously, then the detection accuracy is improved, but the total consumed current becomes excessive
Solution Approach 1:
Instead of applying constant current to all switches simultaneously, the system uses periodic switching to apply constant current to only one switch connection portion at a time. This maintains detection accuracy for each switch while significantly reducing total current consumption, as the current is active for only a fraction of the time
Solution Approach 2:
The system transitions from a static simultaneous detection approach to a dynamic time-division approach. The connection control portion dynamically switches between different switch connection portions, allowing the same detection circuit to be reused over time, thereby reducing overall current consumption while maintaining detection precision
Data Source
AI summary
A switch state detection circuit according to the present invention comprises: a plurality of switch connection portions to each of which a switch is connected, a connection line to which any one of the switch connection portions is connected in a switchable manner, a detection portion that detects a state of the switch connected to the connection line based on a state of the connection line, and a connection control portion that switches successively each of the switch connection portions and connects it to the connection line, wherein the state of each switch is detected.