Patents Assigned to Guangdong Greenlight Photoelectric Technology Co., Ltd
  • Patent number: 9072151
    Abstract: A high intensity discharge (HID) ballast circuit comprises a trigger circuit, a power half-bridge self-excited oscillation circuit, which is arranged to enable self-excited oscillation by energizing an angle capacitor Cgs with a Miller capacitor Cdg of a power MOSFET when an original single pulse output by the trigger circuit is excited, and then output self-excited oscillation signals; and a filter loop which is arranged to match impedance for the self-excited oscillation signals, thereby converting a low-impedance voltage source to a high-impedance constant current source. The inherent phase relationship of the power MOSFET is utilized, and oscillation signals are generated by a power half-bridge self-excited oscillation circuit, and then impedance matching for the oscillation signals is performed by the filter loop, and finally an HID lamp is triggered. As a result, damages to human eyes caused by stroboscopic effect can be avoided and electro magnetic compatibility test can be passed.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: June 30, 2015
    Assignee: GUANGDONG GREENLIGHT PHOTOELECTRIC TECHNOLOGY CO., LTD
    Inventors: Lishan Xie, Yujia Chen, Qinghui Yuan, Hongmin Yang
  • Publication number: 20140001957
    Abstract: A high intensity discharge (HID) ballast circuit comprises a trigger circuit, a power half-bridge self-excited oscillation circuit, which is arranged to enable self-excited oscillation by energizing an angle capacitor Cgs with a Miller capacitor Cdg of a power MOSFET when an original single pulse output by the trigger circuit is excited, and then output self-excited oscillation signals; and a filter loop which is arranged to match impedance for the self-excited oscillation signals, thereby converting a low-impedance voltage source to a high-impedance constant current source. The inherent phase relationship of the power MOSFET is utilized, and oscillation signals are generated by a power half-bridge self-excited oscillation circuit, and then impedance matching for the oscillation signals is performed by the filter loop, and finally an HID lamp is triggered. As a result, damages to human eyes caused by stroboscopic effect can be avoided and electro magnetic compatibility test can be passed.
    Type: Application
    Filed: July 26, 2011
    Publication date: January 2, 2014
    Applicant: Guangdong Greenlight Photoelectric Technology Co., Ltd
    Inventors: Lishan Xie, Yujia Chen, Qinghui Yuan, Hongmin Yang