Smart Switch Power Circuit to Prevent Ghost Fire
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Solution Overview
Problem
Traditional mechanical switches are inadequate for smart appliances, and smart switches with wireless communication modules often experience a 'ghost fire' phenomenon due to high current output when switched off, causing unnecessary power consumption and energy wastage.
Innovation Solution
A switch circuit and control method that includes a wireless communication module, a switch module coupled with a load, an energy storage circuit, a switch-on power obtaining circuit, and a switch-off power obtaining circuit, where the switch-off power obtaining circuit outputs a second current less than the first current to prevent unnecessary power consumption when the switch is off, and the energy storage circuit supplements power to the wireless communication module when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a smart switch with wireless communication module is used, then wireless control capability is improved, but current leakage through the load causes ghost fire phenomenon and energy wastage
Solution Approach 1:
The power supply path is segmented into two separate circuits: a switch-on power supply circuit that provides high current when the switch is on, and a switch-off power supply circuit that provides minimal current when the switch is off. This segmentation allows the wireless communication module to receive adequate power for operation while preventing excessive current from flowing through the load when the switch should be off, thereby eliminating the ghost fire phenomenon.
Solution Approach 2:
The patent introduces an intermediary power supply circuit that acts as a mediator between the mains power and the wireless communication module. This intermediary circuit selectively controls power delivery based on the switch state, providing sufficient power for wireless communication while blocking excessive current that would cause energy wastage and ghost fire through the load.
2Reliability
If high current is output when switched off to maintain power supply, then wireless communication module operation is ensured, but ghost fire phenomenon occurs causing unnecessary power consumption
Solution Approach 1:
The power supply circuit dynamically adjusts its output characteristics based on the switch state. When the switch is on, the circuit provides high current to both the load and the wireless communication module. When the switch is off, the circuit transitions to a different operational mode where it provides only minimal current sufficient for the wireless communication module but insufficient to activate the load, thereby preventing ghost fire while maintaining wireless functionality.
Data Source
AI summary
The present disclosure provides a switch circuit and a control method thereof, a smart switch and a control system. The switch circuit includes a wireless communication module, a switch module coupled to a load, a switch-on power obtaining circuit, an energy storage circuit coupled with the wireless communication module and a switch-off power obtaining circuit. The load is coupled with a neutral wire. The switch-on power obtaining circuit is configured to output a first current to the energy storage circuit in response to the switch module being switched on. The switch-off power obtaining circuit is configured to output a second current to the energy storage circuit via the second power supply terminal in response to the switch module being switched off. The second current is less than the first current.