DocumentCode :
1803869
Title :
A smart synchronous rectifier for 12 V automobile alternators
Author :
Rees, Stephan ; Ammann, Ulrich
Author_Institution :
Inst. of Power Electron. & Control Eng., Stuttgart Univ., Germany
Volume :
4
fYear :
2003
fDate :
15-19 June 2003
Firstpage :
1516
Abstract :
A new gate control unit for power MOSFETs is presented in this paper, which is especially suited for synchronous rectifiers in 12 V automobile vehicle-nets to replace inefficient silicon diodes. Unlike known control units for such synchronous rectifiers based on comparator circuits or external timing control, the proposed circuitry is inexpensive and insensitive, as it consists of only one operational amplifier and some passive components per MOSFET. Measurements taken on a prototype synchronous rectifier connected to a standard passenger car´s alternator prove a major increase of the rectification efficiency as well as a higher output current of the alternator compared to a standard diode rectifier. This synchronous rectifier operates at load currents up to 120 A and up to a maximum alternator speed of 15000 rpm. The entire gate drive circuit is described, providing information about the desired properties of its components. The switching processes of the presented circuit as well as the parameters that determine its operational performance are explained in detail.
Keywords :
alternators; power MOSFET; rectifiers; switching functions; 12 V; 120 A; automobile alternators; comparator circuits; diode rectifier; power MOSFET; switching processes; synchronous rectifier; Alternators; Automobiles; Circuits; Diodes; MOSFETs; Measurement standards; Rectifiers; Silicon; Thyristors; Timing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialist Conference, 2003. PESC '03. 2003 IEEE 34th Annual
ISSN :
0275-9306
Print_ISBN :
0-7803-7754-0
Type :
conf
DOI :
10.1109/PESC.2003.1217684
Filename :
1217684
Link To Document :
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