5/19/2018 12V to 230V 50Hz Square Wave Inverter With 555
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12V / 230V 50Hz square wave inverter with 555 The DC/AC power
inverter can be useful anywhere where you do not have mains outlet,
for example a car, trailer
or cottage. It can power mains appliances like radios, tape
recorders, DVD players, televisions, electric shavers,
fluorescent lamps or cell phone charger. The maximum load
depends on the transformer, transistors, and the size of
the heatsink.
The source of 50 Hz frequency is a well known 555 timer. The
frequency is set by the resistance of Rx and
capacitor Cx. As the switches two N-type MOSFETs are used. One
is driven directly from the 555 IC, the other
through an logic inverter with BC547. Transformer is a mains one
with two secondary windings 12V and must be
designed for the maximum load required. The heat sink of the two
power transistors must have heatsink according to
the load. They are mounted on isolation pads. You can also use
separate heatsink for each transistor and no
isolation pads, but then the heatsinks must not touch each other
and must not be grounded. The 12V supply must be
sufficiently hard, the supply voltage should be in the range of
about 11 - 14V. Use the proper fuse in series with the
power input! In products that are not dependent on the frequency
of 50Hz, it is possible to use a higher frequency,
about 100 - 300Hz. This reduces the standby power. The frequency
can be adjusted by changing the values of Rx
and Cx. It is also easy to modify the system from 50Hz to 60Hz
just by reducing the Rx value by 1/6 (from 120k to100k). MOSFET can
be IRFZ44 for loads up to 200W, IRFZ48 up to 350W or IRF3205 up to
600W. For output
above 600 watts is possible to combine multiple transistors
IRF3205 in parallel. Very good parameters has also
IRF1405. This type of DC/AC power inverter has non-stabilized
output voltage, square wave.
Warning:
Whenworking with the power inverter be careful - the output
voltage is lethal, although input is safevoltage. Output voltage is
isolated from the ground, but if you touched bothoutput terminal
the voltage is
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