发明公开
EP1740023A2 Ballast with output ground-fault protection 审中-公开
Vorschaltgerätmit ausgangseitigem Erdschlussfehlerschutz

  • 专利标题: Ballast with output ground-fault protection
  • 专利标题(中): Vorschaltgerätmit ausgangseitigem Erdschlussfehlerschutz
  • 申请号: EP06013141.4
    申请日: 2006-06-26
  • 公开(公告)号: EP1740023A2
    公开(公告)日: 2007-01-03
  • 发明人: Yadlapalli, Naveen
  • 申请人: OSRAM-SYLVANIA INC.
  • 申请人地址: 100 Endicott Street 01923 Danvers, MA US
  • 专利权人: OSRAM-SYLVANIA INC.
  • 当前专利权人: OSRAM-SYLVANIA INC.
  • 当前专利权人地址: 100 Endicott Street 01923 Danvers, MA US
  • 代理机构: Raiser, Franz
  • 优先权: US172087 20050630
  • 主分类号: H05B41/285
  • IPC分类号: H05B41/285
Ballast with output ground-fault protection
摘要:
A ballast (10) for powering at least one gas discharge lamp (40) includes an EMI filter (100), a full-wave rectifier (200), a DC-to-DC converter (300), an inverter (400), an output circuit (500), and a microcontroller (600). In response to an output ground-fault condition wherein at least one output terminal (502,504,506,508) of the ballast (20) is shorted to earth ground, the microcontroller (600) directs the DC-to-DC converter (300) to remain in a non-operating mode wherein the output voltage of the DC-to-DC converter (600) is substantially zero, thereby protecting the inverter (400) from damage. Preferably, the microcontroller (600) monitors a voltage across a DC blocking capacitor (530) within the output circuit (500) prior to startup of the DC-to-DC converter (300) in order to determine if an output ground-fault condition is present.
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