Zumtobel Group has filed a patent for an emergency lighting unit that includes multiple battery modules connected in parallel and a common charging circuit. The charging circuit is designed to charge and maintain the second battery module at a maximum of 50% of the nominal charging voltage of the first battery module. This invention aims to improve the reliability and efficiency of emergency lighting systems. GlobalData’s report on Zumtobel Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Zumtobel Group, pipeline inspection robots was a key innovation area identified from patents. Zumtobel Group's grant share as of September 2023 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Emergency lighting unit with dual battery modules and common charging circuit

Source: United States Patent and Trademark Office (USPTO). Credit: Zumtobel Group AG

A recently filed patent (Publication Number: US20230307946A1) describes an emergency lighting unit that is designed to supply power to an emergency lighting module. The unit includes mains supply terminals, at least one first battery module, and at least one second battery module. The first and second battery modules are connected in parallel and are charged and maintained by a common charging circuit connected to the mains supply terminals. The emergency lighting module is powered by an emergency driver circuit connected to the terminals of the emergency lighting unit.

The charging circuit is specifically configured to charge and maintain the second battery module to a maximum charging voltage of 50% of the nominal charging voltage of the first battery module. This allows for efficient charging and maintenance of both battery modules.

The charging circuit also includes a switchover module that can selectively charge either the first battery module or the second battery module. This provides flexibility in the charging process.

The emergency driver circuit is designed to take power from either the first battery module or the second battery module, allowing for reliable emergency lighting operation.

Both the first and second battery modules are described as potentially containing lithium-ion batteries, with the battery cells connected in parallel. This configuration ensures sufficient power supply for the emergency lighting module.

The battery modules also include battery thermal sensors to detect the temperature of each module. If the temperature of either module is below a threshold value, a control unit in the emergency lighting unit connects the second battery module in parallel to the first battery module.

In case the duration test of the first battery module results in a duration time value below a set threshold value, the charging circuit is configured to charge the second battery module up to 100% of the nominal charging voltage.

The patent also describes an emergency lighting means that includes the emergency lighting unit and an LED emergency lighting module supplied by the unit.

Overall, this patent presents an innovative emergency lighting unit that efficiently charges and maintains multiple battery modules, ensuring reliable power supply for emergency lighting. The inclusion of battery thermal sensors and a control unit adds an extra layer of safety and performance optimization to the unit.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.