Solid-State Lighting With An Adapted Control Voltage

Abstract

An LED luminaire comprises a power switching driver, LED array(s) powered by the power switching driver, and a detection and control circuit. The detection and control circuit comprises a voltage sensing circuit, a current sensing circuit, a voltage regulator circuit, an optocoupler circuit, and a pair of low-voltage input ports receiving an external voltage. The detection and control circuit is configured to extract an electrical signal from an output voltage, an output current driving the LED array(s), and the external voltage and to couple an optical feedback signal to the power switching driver. The external voltage comprises a voltage sent from a motion sensor, an adapted control voltage from a daylight sensor, or both to control the power switching driver to offset lighting amount of the LED luminaire to reduce energy consumption in response to changing daylight availability when a motion is detected.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present disclosure is part of a continuation-in-part (CIP) application of U.S. patent application Ser. No. 16 / 208,510, filed 3 Dec. 2018, which is part of CIP application of U.S. patent application Ser. No. 16 / 154,707, filed 8 Oct. 2018, which is part of a CIP application of U.S. patent application Ser. No. 15 / 947,631, filed 6 Apr. 2018 and issued as U.S. Pat. No. 10,123,388 on 6 Nov. 2018, which is part of a CIP application of U.S. patent application Ser. No. 15 / 911,086, filed 3 Mar. 2018 and issued as U.S. Pat. No. 10,136,483 on 20 Nov. 2018, which is part of a CIP application of U.S. patent application Ser. No. 15 / 897,106, filed 14 Feb. 2018 and issued as U.S. Pat. No. 10,161,616 on 25 Dec. 2018, which is a CIP application of U.S. patent application Ser. No. 15 / 874,752, filed 18 Jan. 2018 and issued as U.S. Pat. No. 10,036,515 on 31 Jul. 2018, which is a CIP application of U.S. patent application Ser. No. 15 / 836,170, filed 8 Dec. 2...

AI Technical Summary

Benefits of technology

The patent describes a circuit that helps reduce the voltage or current driving LED arrays, which can help to decrease the duty cycle and improve the overall performance of the circuit. This is achieved by using an error amplifier, a diode, and a switch to control the voltage sensing circuit and current sensing circuit. The technical effect of this invention is to improve the accuracy and efficiency of the circuit, which can help to achieve better performance and reliability.

Problems solved by technology

But the fact is that total cost of ownership for this approach is high regardless of very low initial cost.

If the existing ballast is not compatible with the ballast-compatible LED lamp, the consumer will have to replace the ballast.

Some facilities built long time ago incorporate different types of fixtures, which requires extensive labor for both identifying ballasts and replacing incompatible ones.

Maintenance will be complicated, sometimes for the lamps and sometimes for the ballasts.

The labor costs and long-term maintenance costs will be unacceptable to end users.

In this sense, any energy saved while using the ballast-compatible LED lamps becomes meaningless with the constant energy use by the ballast.

In the long run, the ballast-compatible LED lamps are more expensive and less efficient than self-sustaining AC mains-operable LED lamps.

Even with such a potential energy saving, some of daylight harvesting systems still cannot be widely accepted.

In fact, impressive energy savings estimates may not be realized in practice due to a poor system design, a time-consuming calibration, or a complicated commissioning.

High costs and imperfect performance of the technologies also inhibit the adoption of daylight harvesting technologies.

Meeting OSHA requirements takes time and investment, but not meeting them could result in fines and even prosecution.

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