go to jove.com

HIGH SCHOOL

Engineering

Concept Videos

Electrical Engineering

This is a free preview. For full access

Energy Storage Elements

Car Spark Coil Voltage Design Example

Description

An automobile ignition system uses a spark plug and a spark coil to create the high voltage needed to ignite the fuel-air mixture in each cylinder. The spark plug has two electrodes with an air gap between them. When enough voltage appears across that gap, a spark forms and starts combustion.

A 1...

Transcript

汽车的点火系统包含一个关键部件——火花塞,其具有两个被空气间隙隔开的电极。当在两个电极之间施加高电压时,会在空气间隙中产生电火花,从而点燃燃料。

设计使用小型汽车电池工作的火花塞涉及电感特性的应用。

当点火开关关闭时,火花线圈中的电流持续稳定上升,直至达到稳定状态。在电流恒定时,电压变为零。

然而,当开关突然断开时,电感器内部及周围的磁场迅速坍塌,产生高电压,从而引发火花。

出于设计目的,考虑一个已知电感和电阻的火花线圈。若由12伏电池供电,当开关断开且开关断开时间为2微秒时,目标是估算通过线圈的最终电流以及空气间隙两端的电压。

电池电压与线圈电阻的比值即为电流。

通过将已知值代入电感的电压关系式来确定...

More videos by Standards