Emergency Lighting Power Supply With Single-Pin Feedback Control
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Solution Overview
Problem
Existing emergency power supply units for lighting systems require multiple pins for feedback control, limiting their versatility and increasing production costs due to the need for different control units for basic and complex versions, especially when implementing features like DALI-functionality.
Innovation Solution
An emergency power supply unit design that uses a single pin for feedback information from both the charging and driving units, allowing the same control unit to manage both functions and enabling additional features without the need for multiple control units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate feedback pins are used for charging unit and driving unit, then control precision is improved, but device complexity and production costs increase
Solution Approach 1:
The patent combines the feedback information paths of the charging unit and driving unit into a single feedback pin. The control unit multiplexes this single pin to receive feedback signals from both units at different times, thereby reducing the number of pins required while maintaining control precision through time-division multiplexing of the feedback signal reception.
Solution Approach 2:
The single feedback pin is designed to serve multiple functions by receiving feedback information from both the charging unit and the driving unit. The control unit intelligently switches between receiving feedback from different units, making this single pin universal for multiple feedback purposes, thus reducing device complexity without sacrificing control capability.
2Adaptability or versatility
If multiple control units are used for different functions, then functional versatility is improved, but manufacturing costs and device complexity increase
Solution Approach 1:
The control unit is designed with multi-functionality to handle both charging unit control and driving unit control, as well as additional features like DALI functionality. By integrating multiple control functions into a single control unit and using time-division multiplexing for feedback reception, the patent achieves functional versatility without requiring separate control units for each function, thereby reducing manufacturing costs and device complexity.
Solution Approach 2:
The control unit dynamically switches between different operational modes and feedback sources. It can selectively receive feedback from the charging unit or driving unit based on operational requirements, and can also interface with additional functionality like DALI. This dynamic adaptability allows a single control unit to perform multiple roles that would traditionally require separate dedicated control units.
Data Source
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AI summary
The present invention provides an emergency power supply unit (1) for operating an emergency lighting means (6), preferably comprising at least one LED (6a); wherein the emergency power supply unit (1) comprises: - an energy storage unit (2), preferably a rechargeable battery; - a charging unit (3) comprising a first actively switched converter (3a) with at least a first switch (S1) and at least a first energy storage (L1), wherein the first actively switched converter (3a) is configured to charge the energy storage unit (2) with electrical energy from an external electrical energy source (7); - a driving unit (4) comprising a second actively switched converter (4a) with at least a second switch (S2) and at least a second energy storage (L2), wherein the second actively switched converter (4a) is configured to supply the emergency lighting means (6) with electrical energy from the energy storage unit (2); and - a control unit (5) configured to operate - the first actively switched converter (3a) based on feedback information fed back from the first actively switched converter (3a) and - the second actively switched converter (4a) based on feedback information fed back from the second actively switched converter (4a); Whereby the control unit (5) is configured to receive via a single first pin (P1) the feedback information fed back from the first actively switched converter (3a) and the feedback information fed back from the second actively switched converter (4a). In addition the invention provides an emergency lighting device and an operating method.