USPTO Patent Grant: Hysteresis Circuit for Lighting

ChangeBridge: Patent Grants - Power Supply (H02J)

Published March 24th, 2026

Detected March 25th, 2026

Summary

The USPTO has granted a patent (US12588125B2) to OPPLE LIGHTING CO., LTD. for a hysteresis circuit, emergency lighting circuit, and lighting device. The patent details a system for timely and accurate judgment of input voltage status in lighting devices.

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What changed

The United States Patent and Trademark Office (USPTO) has issued patent US12588125B2 for a hysteresis circuit, emergency lighting circuit, and lighting device. The patent, assigned to OPPLE LIGHTING CO., LTD., describes a circuit that includes voltage detection, isolation coupling, and voltage adjusting modules. This system aims to accurately monitor input voltage status by triggering output signal flips based on specific voltage thresholds.

This patent grant represents a new intellectual property right for the assignee. While it does not impose direct regulatory obligations on other entities, it may influence product development and competition within the lighting manufacturing sector. Companies developing similar technologies should be aware of this granted patent to avoid potential infringement issues.

Source document (simplified)

← USPTO Patent Grants

Hysteresis circuit, emergency lighting circuit and lighting device

Grant US12588125B2 Kind: B2 Mar 24, 2026

Assignee

OPPLE LIGHTING CO., LTD.

Inventors

Xinsheng Liu, Guangchuan Zhu

Abstract

The present disclosure discloses a hysteresis circuit, an emergency lighting circuit, and a lighting device. The hysteresis circuit includes a voltage detection module, an isolation coupling module, and a voltage adjusting module. By detecting the sampling voltage associated with the input voltage, in the case that the sampling voltage is detected to decrease to the trigger action voltage point, the corresponding level of the output signal flips until it is detected that the sampling voltage rises to the reverse recovery voltage point, and the corresponding level of the output signal is controlled to flip again, thus achieving timely and accurate judgment of input voltage status.