Inverter with improved overcurrent protection circuit, and...

Details Inverter with improved overcurrent protection circuit, and... Inverter with improved overcurrent protection circuit, and...

2006-09-28

2009-02-10

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C363S049000, C363S056040, C323S285000, C323S901000, C323S908000

Reexamination Certificate

active

07489531

ABSTRACT:
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.

REFERENCES:
patent: 6545432 (2003-04-01), Konopka
patent: 6822401 (2004-11-01), Borella et al.
patent: 6930454 (2005-08-01), Lott
patent: 6933682 (2005-08-01), Ziegler
patent: 2003/0025464 (2003-02-01), Konopka
Related International Patent Application No. PCT/US07/19368, Search Report dated Apr. 10, 2008, 2 pgs.

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