Lighting circuit and lighting device

The lighting circuit manages AC and DC power sources to prevent over-discharge and battery degradation by controlling the power path based on battery voltage, ensuring continuous operation of the lighting load.

JP2026100485APending Publication Date: 2026-06-19PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2024-12-09
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Conventional lighting devices using storage batteries for emergency lighting can lead to battery over-discharge and accelerated deterioration if the light source continues to operate until the battery is completely depleted during a power outage.

Method used

A lighting circuit with an AC/DC conversion circuit, charging circuit, adjustment circuit, control circuit, control power supply circuit, and switching circuit that controls the path for DC power from the storage battery, stopping power output when the battery voltage reaches a threshold to prevent over-discharge.

Benefits of technology

The solution effectively prevents storage battery over-discharge and reduces degradation by managing power supply from both AC and DC sources, ensuring continued operation of the lighting load while protecting the battery.

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Abstract

The objective of this disclosure is to suppress the degradation of storage batteries. [Solution] The control power supply circuit 14 generates a control power supply voltage V5 to operate the control circuit 13. The switching circuit 15 opens and closes the first path LN1 that inputs DC power from the storage battery 20 to the input section 140 of the control power supply circuit 14. The switching circuit 15 is configured to open and close the first path LN1 by the drive voltage V3 output from the control circuit 13. The control circuit 13 outputs a drive voltage V3 to the switching circuit 15 to close the path when the supply of AC power (output voltage V2) from the normal power supply P1 stops. The control circuit 13 stops outputting the drive voltage V3 and opens the first path LN1 when the battery voltage V6 of the storage battery 20 reaches a predetermined threshold.
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