Doorbell Power Sharing Switch Circuit for False Ringing Prevention
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Solution Overview
Problem
The existing methods for sharing power between doorbell systems and security devices often face compatibility issues due to varying impedances, leading to improper doorbell operation and false ringing, as the impedance of the bypass circuit may not match that of the doorbell, causing current to flow and triggering unintended ringing.
Innovation Solution
An electronic system with a switch circuit and a power-supply method that includes a first and second power terminal, a doorbell actuating unit, and a function circuit, where the switch circuit normally disconnects the power supply to the doorbell, forming a short circuit between the power terminals to supply power to security devices, and switching to provide power to the doorbell when needed, ensuring compatibility and preventing false activations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the doorbell is short-circuited by the bypass circuit to supply power to security devices, then power sharing is achieved and security devices can be powered, but impedance incompatibility causes current to still flow to the doorbell resulting in false ringing
Solution Approach 1:
The circuit is divided into two distinct modes: a first mode where the switch circuit connects the first and second contacts to power security devices while isolating the doorbell, and a second mode where the switch circuit connects the third and fourth contacts to power the doorbell. This segmentation eliminates impedance conflicts by ensuring only one circuit path is active at a time.
Solution Approach 2:
The switch circuit dynamically changes its configuration based on operational mode. In the first mode, it establishes a low-impedance path for security devices while opening the doorbell circuit. In the second mode, it reverses the connections to prioritize doorbell operation. This dynamic switching resolves the static impedance incompatibility problem.
2Reliability
If additional power wires are installed for security devices, then power supply reliability is improved, but installation complexity and cost increase
Solution Approach 1:
The existing doorbell power circuit is made multi-functional to serve both the doorbell and security devices. The switch circuit enables the same power lines to be shared between different loads by dynamically reconfiguring the circuit connections, eliminating the need for separate dedicated power wires for security devices.
Solution Approach 2:
The system uses the existing doorbell circuit infrastructure to automatically power security devices when the doorbell is not in use. The circuit self-regulates power distribution based on operational state, eliminating the need for additional wiring infrastructure while maintaining reliable power supply.
3Loss of energy
If the bypass circuit is designed with low impedance to short-circuit the doorbell, then power efficiency is improved, but impedance mismatch causes current leakage to the doorbell triggering false activation
Solution Approach 1:
Instead of using a traditional bypass circuit that parallel-connects to the doorbell (which causes current division and false activation), the invention inverts the approach by using a series-switching mechanism. The switch circuit completely opens or closes the doorbell circuit path based on mode, eliminating partial current flow and false activation while maintaining power efficiency.
Data Source
AI summary
An electronic system sharing power of a doorbell includes a switch circuit and an electronic device. The first and second connection terminals of the switch circuit are respectively coupled to two doorbell contacts. The second and third connection terminals of the switch circuit are respectively coupled to two ends of a doorbell. Two power terminals of the electronic device are respectively coupled to two switch contacts. A function circuit of the electronic device is coupled between the two power terminals. In a normal mode, the first connection terminal is conducted to the second connection terminal inside the switch circuit, and the two power terminals are disconnected from each other by a doorbell actuating unit of the electronic device. In a ringing mode, the doorbell actuating unit short-circuits the two power terminals, and the first connection terminal is conducted to the third connection terminal inside the switch circuit.