By Trevor Mellard

ISBN-10: 0750604360

ISBN-13: 9780750604369

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Extra resources for Automotive Electronic Systems

Sample text

The secondary current is in fact, reduced by the same factor (in our example 100:1), therefore the secondary current will be 100 times less than the current flowing in the primary at the moment of induction. For this reason the diameter of the wire used in the secondary winding is thinner than that of the primary. The final value of the stepped up secondary voltage is also influenced by: 1 the rate of change of the magnetic field 2 the strength of the magnetic field current. The conventional (Kettering) ignition system and more modern electronic ignition systems generate the ignition voltage in the same way.

J field system ! 5 Full wave rectification of a single phase alternating current (a) Positive half cycle from Wl conducted by diode Dl: Diode D2 not conducting due to negative bias at W2. 6). During positive half cycles diodes D , and D 3 conduct, while during negative half cycles diodes D 2 and D 4 conduct. 7(a), to give DC output. 7(b). As the waveform is much smoother field ^ diodes than the waveform of a single phase full wave diodes (also used with |* auxiliary field rectifier (Fig. 6(c)) it can be appreciated that the diodes for full ■^wave rectification average DC value is correspondingly greater.

The output voltage of the pulse shaper circuit is therefore high. The positive part of the signal pulse is blocked by diode D4, so transistor T{ (and the rest of the circuit) is unaffected. The negative part of the signal pulse, however, reduces the base voltage of transistor Ύγ. 7V) the tran­ sistor turns off, turning transistor T 2 on and the output voltage goes low. When the negative part of the signal pulse decays, the base voltage of Tl again increases above the threshold voltage and the transistor once more turns on, turning T 2 off, and the output goes high.