The document discusses the transistor ignition system, which enhances ignition performance by controlling high currents with low base currents, and helps prevent contact breaker wear in conventional systems. It highlights the system's construction, types (breaker point and magnetic pulse), advantages such as increased lifespan of components and high ignition voltages, along with disadvantages like higher costs and the need for more mechanical points. Overall, it provides an overview of the system's working principles and its benefits over traditional ignition methods.

1. 19A502 - AUTOMOTIVE ELECTRONICS AND ELECTRICALS
TRANSISTOR IGNITION SYSTEM
MANU KRISHNA M R
19A226

2. INTRODUCTION
● A transistor interrupts a relatively high
current carrying circuit, i.e, it controls
high current in the collector circuit
with less current in the base circuit.
● Therefore, a transistor is used to assist
the work of a contact breaker.
● Hence, this system is known as
Transistor assisted ignition system or
transistorized ignition system.
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3. REASON FOR CHOOSING TRANSISTOR IGNITION
SYSTEM
● In conventional ignition systems, the Breaker points burns due to the High current
in the circuit.
● When Engine speed is High, the Breaker opens quickly. Leads to Low Spark Voltage.
TRANSISTOR AS A SWITCH 3

4. CONSTRUCTION
It consists of:
● Battery
● Ignition switch
● Transistor
● Contact breaker
● Ignition coil.
● Distributor and
● Spark plugs.
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5. TYPES
There are two types of Transistor Ignition System:
1. Breaker Point Type
2. Magnetic Pulse Type
BREAKER POINT TYPE MAGNETIC PULSE TYPE 5

6. WORKING
When CB is CLOSED:
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7. When CB is OPEN:
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8. ADVANTAGES AND DISADVANTAGES
Advantages :
1. It increases the life of contact
breaker points.
2. It gives high ignition voltages .
3. It gives longer duration of sparks
4. It has very accurate control of
timing.
5. It needs less maintenance.
Disadvantages :
1. More mechanical points are
needed similar to a
conventional system.
2. Cost is high
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