In car ignition systems, voltages of 5-17kV are necessary to initiate a spark. A transformer with a winding ratio of 1:100 is typically used with a 12V battery, yielding 1200V. However, higher voltages are achieved through the principle of induction, where the voltage output is determined by the rate of change of current (di/dt) in the primary coil. The faster the interruption of the primary current, the greater the voltage pulse delivered to the spark plug.
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The transformer turns ratio gives the voltage ratio only for sinewaves, i.e., AC of appropriate frequency. The coil in a car is designed to operate differently. It is supplied with interrupted DC and the high voltage output is defined by the more general induction characteristicNoirro said:Homework Statement
Hey there! I have simple problem:
To start a spark in a car ignition system, voltages of 5-17kV are required. A transformer with winding ratio 1:100 is used with a 12V battery, so we get a 1200V voltage. How are higher voltages achieved in such systems?
Thanks