Safety Circuit and Brush Holder for Preventing Fault Conditions in an Alternator

An alternator and circuit technology, applied in the direction of controlling generators, controlling generators and circuit devices through magnetic field changes, can solve problems such as failure to solve the full electric field condition

Active Publication Date: 2016-12-21
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the above remedies do not address the case of full electric field conditions caused by a short circuit occurring around the excitation control switch, i.e. the case where the mains voltage is electrically shorted directly to the rotor input

Method used

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  • Safety Circuit and Brush Holder for Preventing Fault Conditions in an Alternator
  • Safety Circuit and Brush Holder for Preventing Fault Conditions in an Alternator
  • Safety Circuit and Brush Holder for Preventing Fault Conditions in an Alternator

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Embodiment Construction

[0021] Embodiments described herein are used to avoid or mitigate fault conditions, such as uncontrolled full electric field conditions in the alternator and related overvoltage conditions at the alternator output. This is not accomplished by adding a large and expensive switch on the output of the alternator. To account for various fault conditions that can result in a full electric field condition, including a short circuit between the supply voltage (e.g., battery voltage) and the input feeding the alternator rotor, a safety switch is added that is configured to connect the supply voltage to the excitation control The switch is open, wherein the excitation control switch provides excitation current to the rotor of the alternator.

[0022] figure 1 A high level block diagram of a typical automotive electrical system 100 is provided. System 100 includes various vehicle loads 110 , a battery 130 and an alternator 140 . The vehicle load 110 includes an electronic control uni...

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PUM

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Abstract

A fault protection circuit for an alternator is provided for preventing faults such as a prolonged full-field condition in the alternator. The fault protection circuit includes a safety switch that is opened when the alternator output voltage becomes too high, as may occur during a full-field condition caused by an electrical short, or when some other fault is detected within the alternator. The opening of this safety switch disconnects a supply voltage feeding an excitation current control switch. The excitation current control switch normally adjusts an excitation current provided to a rotor in the alternator, in order to regulate a voltage output from the alternator. By providing a safety switch that disconnects the supply voltage for the rotor excitation in the alternator, the alternator output voltage may be prevented from reaching excessive levels that may damage devices in an electrical system and a battery coupled to the alternator.

Description

technical field [0001] The present invention relates to safety circuits, brush holders and methods for preventing or mitigating fault conditions in alternators. Background technique [0002] Automotive electrical systems are required to provide electrical energy to various devices within the vehicle. These devices usually include electric starters, engine ignition systems, electric control units (computers), headlights and various accessories. Power is supplied to these devices (loads) by batteries, the most common type being 12V lead-acid batteries. When the vehicle's engine is not running, the battery is usually the primary or only source of electrical power, and when the engine is running, both the battery and the alternator usually provide electrical power. [0003] The alternator converts the mechanical energy generated by the engine into electrical energy used to meet the needs of various electrical devices and to charge batteries. In order to maintain a sufficient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/00H02P9/30H02P101/45
CPCH02H3/00H02P9/30H02P2101/45H02P9/48H02P29/0241H02P9/006H02P29/024
Inventor M·格雷夫林C·塞得尔
Owner INFINEON TECH AG
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