Smart Doorbell Control Module Circuit Segmentation
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Solution Overview
Problem
Conventional smart doorbell systems experience a buzzing sound issue due to current flow through the chime when the chime switch is turned off, disrupting family members.
Innovation Solution
A doorbell system with a control module that determines current flow through the chime by using a control circuit unit and control switch, disconnecting power to the chime when the switch is off to prevent buzzing, and utilizing impedance matching and thermistor-based circuits to manage power distribution between the chime and smart module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the chime switch is turned off, then the smart module can be powered, but the chime generates buzzing sound due to current flow
Solution Approach 1:
The circuit is segmented into two independent paths: one for the chime and one for the smart module. The control switch specifically controls the chime circuit path, allowing independent operation of the chime and smart module without current interference between them.
Solution Approach 2:
The control switch acts as an intermediary component that mediates the current flow to the chime. It selectively blocks or permits current based on the chime switch state, preventing unwanted current flow from the smart module path to the chime when the chime switch is off.
2Device complexity
If the chime and smart module are connected in series, then the circuit is simple, but the current from the smart module causes buzzing in the chime
Solution Approach 1:
The series connection is segmented into parallel branches with independent control. The chime branch includes the control switch for selective disconnection, while the smart module branch remains independently powered, eliminating the harmful current interaction while maintaining circuit simplicity.
3Object-generated harmful factors
If the control switch is added to prevent buzzing, then the buzzing sound is eliminated, but the device complexity increases
Solution Approach 1:
The control circuit unit automatically detects the chime switch state and autonomously controls the control switch accordingly. This self-service mechanism eliminates buzzing without requiring manual intervention or complex control logic, minimizing the added complexity.
Data Source
AI summary
A doorbell system includes a power supply circuit, a smart module, a chime, a chime switch and a control module. The smart module provides a smart function. The chime switch is electrically connected between the control module, the smart module, and the power supply circuit. When the chime switch is turned on, the current flows through the chime under control of the control module. When the chime switch is turned off, the current cannot flow through the chime under control of the control module; consequently, the buzzing sound cannot be generated.