Fire Control Power Switching via LLC Resonant Converter
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Solution Overview
Problem
Existing fire control systems face stress and failure due to extra load from battery systems during AC/DC power transitions, leading to short conditions and overcurrent protection, with previous solutions being expensive and noise-sensitive.
Innovation Solution
The system employs MOSFETs and an isolated battery approach to transition between AC/DC and battery power without dedicated control circuits or relays, using an LLC resonant converter and opto-couplers for soft switching, reducing noise sensitivity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery system remains connected during AC/DC power supply return, then continuous power supply is maintained, but the battery system creates extra load causing short conditions and stress on the fire alarm system
Solution Approach 1:
The system detects AC power availability in advance and prepares for power source transition before the battery needs to be disconnected. The controller monitors AC power status and initiates the disconnection sequence proactively, preventing the battery from creating harmful load conditions while ensuring continuous power supply to the fire alarm system.
2Ease of operation
If dedicated control circuits are used to manage power switching, then power transition control is improved, but system cost and noise sensitivity increase
Solution Approach 1:
The existing fire alarm system controller is made multi-functional by programming it to perform both fire alarm control functions and AC/battery power management functions. This eliminates the need for separate dedicated control circuits, reducing system complexity and noise sensitivity while maintaining effective power transition control through software-based monitoring and switching logic.
3Ease of operation
If relays are used for power switching, then power source connection is achieved, but device size, lifespan, cost, and noise increase
Solution Approach 1:
The patent replaces mechanical relay-based power switching with an electronic control system that uses solid-state components and software logic to manage power source connections. This substitution eliminates mechanical wear, reduces noise, decreases device size, and improves connection reliability by using electronic switching mechanisms controlled by the fire alarm system's existing processor.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables robust and efficient power switching in fire control systems, reducing stress on the AC/DC power supply and extending component lifespan, while minimizing noise interference and costs.
Implementation Method 1
LLC resonant converter(s)
Implementation Method 2
opto-couplers
Data Source
AI summary
Systems, methods, and devices for fire control system power switching are described herein. One embodiment includes an alternating current (AC) power source, a battery, a notification component, and a control circuit, comprising an LLC circuit comprising an LLC controller component, a transformer component, a rectifier and feedback component, and an opto-coupler component. The LLC circuit can be configured to reduce an LLC output voltage from a first LLC voltage to a second LLC voltage while the notification component is using power supplied by the battery. The control circuit can include a battery-plane voltage transfer component configured to disconnect the battery from a plane voltage of the control circuit and an AC/DC-plane transfer component configured to connect the second LLC output voltage to the plane voltage to supply power from the AC power source.