Zumtobel Group has filed a patent for an isolated primary side switched converter. The converter includes a galvanic isolation stage, a secondary side winding with a center tap, and terminals for connecting an LED load. The rectification circuit sets the terminals at different electrical polarities, with the voltage between the second and first terminal being larger than the voltage between the third and first terminal. GlobalData’s report on Zumtobel Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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 June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Isolated primary side switched converter with galvanic isolation stage
A recently filed patent (Publication Number: US20230132668A1) describes an isolated primary side switched converter. The converter includes a galvanic isolation stage that separates the primary side and the secondary side of the converter. The secondary side winding of the isolation stage is coupled to a primary side winding and includes a center tap. The converter also includes terminals for connecting an LED load on the secondary side and a rectification circuit on the secondary side. The rectification circuit sets the first terminal at a first electrical polarity and the second and third terminals at a second electrical polarity that is different from the first. The voltage between the second and first terminal is larger than the voltage between the third and first terminal.
The converter allows for the connection of an LED load between the first and second terminal, the first and third terminal, and/or the second and third terminal. The secondary side winding does not have any further tapping besides the center tap. Additionally, the converter includes a decoupling circuit to reduce voltage fluctuations between the terminals. The decoupling circuit can include capacitors connected between the terminals. The rectification circuit can be a center tap rectifier or a full wave bridge rectifier, and it can include four diodes or four switches.
The isolated primary side switched converter described in the patent is specifically an LLC converter, particularly a resonant half bridge LLC converter. The patent also includes a driver for light sources, such as LEDs, that incorporates the isolated primary side switched converter. Furthermore, a lighting system is described that includes the driver and an LED light source operated by the driver.
Overall, this patent describes a converter and driver for light sources that utilizes a galvanic isolation stage, a rectification circuit, and a decoupling circuit to efficiently power LED loads. The converter can be used in various lighting systems to provide reliable and stable power to LED light sources.