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Preventing load rejection overvoltages in synchronous rectifiers

A technology of synchronous rectifier and synchronous rectification, which is applied in the equipment field of the preamble, and can solve the problems of high susceptibility to interference

Inactive Publication Date: 2012-09-12
SEG AUTOMOTIVE GERMANY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Control circuits with fast response times are generally also more susceptible to interference; in addition, the corresponding devices require analysis circuits for each phase in order to identify the corresponding current values

Method used

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  • Preventing load rejection overvoltages in synchronous rectifiers
  • Preventing load rejection overvoltages in synchronous rectifiers
  • Preventing load rejection overvoltages in synchronous rectifiers

Examples

Experimental program
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Embodiment Construction

[0033] FIG. 1 shows a section through an alternator 10 for a motor vehicle according to the prior art, in which the method according to the invention can be implemented.

[0034] The generator has a two-part housing 13 comprising a first bearing end shield 13.1 and a second bearing end shield 13.2. The bearing endshield 13.1 and the bearing endshield 13.2 house a stator 16 with an annular sheet pack 17 into which a stator winding 18 is inserted. The stator 16 surrounds the rotor 20 with its radially inwardly oriented surface.

[0035] The rotor 20 has two claw pole plates 22 and 23 which have claw pole fingers 24 and 25 on their respective outer circumferences. The two claw pole plates 22 and 23 are arranged such that their respective claw pole fingers 24 or 25 alternately act as north and south poles on the circumference of the rotor 20 .

[0036] The rotors 20 are mounted rotatably in the respective end shield 13.1 or 13.2 by means of a shaft 27 and each by means of a ball...

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Abstract

The invention relates to a method for reducing load-rejecting overvoltages when operating a synchronous rectifier (29) for a multiphase alternating current having a number of inputs (60.1 to 60.5) corresponding to the number of alternating current phases (A through E) of the alternating current, and at least two outputs for providing a direct current, wherein one alternating current phase (A through E) is connected to each input (60.1 to 60.5) and each of the inputs (60.1 through 60.5) can be electrically selectively connected to either the first (B+) or the second (B-) output (using active switching elements such as MOSFETs oe IGBTs) according to the requirements of control means.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 for avoiding load dump overvoltages when operating a synchronous rectifier for polyphase alternating current, and an associated device according to the preamble of claim 10 . Background technique [0002] For feeding a direct current system from a three-phase power source, for example a public three-phase grid, known rectifiers are used. The rectifiers are generally designed as bridge circuits, with diodes being used as rectifier elements in the simplest case. These diodes do not require further control circuits, since the diodes independently switch to the conducting state or the blocking state at the correct moment, ie when exceeding and falling below the voltage threshold. [0003] Bridge rectifiers implemented in six pulses (in the case of three-phase currents) are also used as rectifiers in three-phase generators (lighting generators) in automobiles. Such generators have a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/10H02P29/02H02H7/06H02H7/125H02J7/14
CPCH02P9/10H02P2201/03H02P2101/45H02P29/0241H02J7/14H02J7/0029
Inventor A.温德米勒R.赫比希P.梅林格A.申迪F.马吉尼
Owner SEG AUTOMOTIVE GERMANY GMBH
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