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    • 1. 发明申请
    • INVERTER WITH IMPROVED OVERCURRENT PROTECTION CIRCUIT, AND POWER SUPPLY AND ELECTRONIC BALLAST THEREFOR
    • 具有改进的过流保护电路的逆变器,以及电源和电子镇流器
    • WO2008042070A2
    • 2008-04-10
    • PCT/US2007/019368
    • 2007-09-05
    • OSRAM SYLVANIA INC.MEHTA, Bhadresh
    • MEHTA, Bhadresh
    • H02M3/24
    • H02M7/53803H02M1/32H02M2001/0009H05B41/2856Y10S323/901Y10S323/908
    • An inverter (100) comprises first and second input terminals (102,104), an inverter output terminal (106), a series arrangement of a first inverter transistor (110) and a second inverter transistor (120), a driver circuit (130), a primary current sensing circuit (150,154,156), and an auxiliary current sensing circuit (160). Primary current sensing circuit (150,154,156) is coupled between second inverter transistor (120) and a current-sense input (132) of driver circuit (130). Auxiliary current sensing circuit (160) is coupled between second inverter transistor (120) and a frequency control input (134) of driver circuit (130). During operation, if the current flow through inverter transistors (110,120) exceeds a predetermined peak limit, auxiliary current sensing circuit (160) provides an auxiliary signal to frequency control input (134) of driver circuit (130), thereby increasing a drive frequency at which driver circuit (130) commutates inverter transistors (110,120). The increase in the drive frequency reduces the peak current flow through inverter transistors (110,120), thereby protecting inverter transistors (110,120) from excessive power dissipation and potentially destructive heating.
    • 逆变器(100)包括第一和第二输入端子(102,104),逆变器输出端子(106),第一逆变器晶体管(110)和第二逆变器晶体管(120)的串联结构, ,驱动器电路(130),主电流感测电路(150,154,156)和辅助电流感测电路(160)。 初级电流感测电路(150,154,156)耦合在第二反相器晶体管(120)与驱动器电路(130)的电流感测输入(132)之间。 辅助电流感测电路(160)耦合在第二反相器晶体管(120)和驱动器电路(130)的频率控制输入(134)之间。 在操作期间,如果流过反相器晶体管(110,120)的电流超过预定的峰值限制,则辅助电流感测电路(160)向驱动器电路(130)的频率控制输入(134)提供辅助信号, 该驱动器电路(130)使逆变器晶体管(110,120)换向。 驱动频率的增加减少流过反相器晶体管(110,120)的峰值电流,从而保护反相器晶体管(110,120)免受过度的功率耗散和潜在的破坏性加热。