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Low-Cost
Transistorised Inverter
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This
is an inexpensive fully transistorised inverter capable
of driving medium loads of the order of 40 to 60 watts
using battery of 12V, 15 Ah or higher capacity. Transistors
T1 and T2 (BC548) form a 50Hz multivibrator. For obtaining
correct frequency, the values of resistors R3 and R4 may
have to be changed after testing. The complementary outputs
from collectors of transistors T1 and T2 are given to
PNP darlington driver stages formed by transistor pairs
T3-T4 and T6-T7 (utilising transistors BD140 and 2N6107).
The outputs from the drivers are fed to transistors T5
and T8 (2N3055) connected for push-pull operation.
Somewhat higher wattage can be achieved by increasing
the drive to 2N3055 transistors (by lowering the value
of resistors R7 and R8 while increasing their wattage).
Suitable heatsinks may be used for the output stage transistors.
Transformer X1 is a 230V primary to 9V-0-9V, 10A secondary
used in reverse. |
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