A 500W PWM inverter
circuit built around IC SG3524 is shown here. SG3524 is an integrated switching
regulator circuit that has all essential circuitry required for making a
switching regulator in single ended or push-pull mode. The built in circuitries
inside the SG3524 include pulse width modulator, oscillator, voltage reference,
error amplifier, overload protection circuit, output drivers etc. SG3524 forms
the heart of this PWM inverter circuit which can correct its output voltage
against the variations in the output load. In a non PWM inverter the change in
output load directly affects the output voltage (when output load increases
output voltage decreases and vice versa), but in a PWM inverter the output
voltage remains constant over a range of output load.
CIRCUIT DIAGRAM OF 500W PWM
INVERTER.
ABOUT
THE CIRCUIT.
Resistor R2 and
capacitor C1 sets the frequency of the ICs internal oscillator. Preset R1 can
be used for fine tuning of the oscillator frequency. Pin 14 and pin 11 are the
emitter terminals of the internal driver transistor of the IC. The internal driver transistors (pin 13
and 12) are tied together and connected to the +8V rail (output of the 7808).
Two 50Hz pulse trains which are 180 degree out of phase are available at pin 14
and 11 of the IC. These are the signals which drive the subsequent power MOSFET
stages. When signal at pin 14 is high, MOSFET Q2 is switched ON and current flows from the +12V source
(battery) connected at point a (marked with label a) through the upper half of
the transformer (T1) primary and sinks to ground through MOSFET Q3. As a result
a voltage is induced in the transformer secondary (due to electromagnetic
induction) and this voltage contributes to the upper half cycle of the 240V
output waveform. During this period pin 11 will be low and its succeeding
stages will be inactive. When 11 of the IC pin goes high MOSFET Q3 is switched ON and as result Current flows from the +12V
source (marked with label a) through the lower half of the transformer primary
and sinks to the ground through MOSFET Q2 and the resultant voltage induced at
the T2 secondary contributes to the lower half cycle of the 220V output wave
form.
The output voltage
regulation section of the inverter circuit works as follows. At point ab D2,D3
rectifies this voltage from the centre tapped configuration which will
be proportional to the inverter’s output voltage is supplied to the pin1 (inverting input of
the internal error amplifier of the IC) through R1, R3, R5 and this voltage is
compared with the internal reference voltage. This error voltage will be
proportional to the variation of the output voltage from the desired value and
the IC adjusts the duty cycle of the drive signals ( at pin 14 and 11) in order
to bring back the output voltage to the desired value. Preset RV1 can be used for adjusting the inverters output
voltage as it directly controls the amount of voltage fed back from the
inverter output to the error amplifier section.
U1 and its associated
components produce an 8V supply from the 12V source for powering the IC and its
related circuitries .C8,9,10 are filter capacitor to prevent hums from
transformer switching . c11 is a filter capacitor wired parallel to voltage regulator IC 7808.
Your email address please
ReplyDeleteI am intrested sir but the numbers of the components in the circuit diagram did not show very well pls email the components and their numbers to me thank you sir.
ReplyDeleteU1 is not connected,it should be connected along d2,d3 rail. To see the components clearly click on the image.
ReplyDeletethank u sir
ReplyDeleteI need the complete circuit .
ReplyDeleteOgbekwetheophilus@gmail.com
Hello sir. I really need this project. Can u email to me.
ReplyDeleteThe feedback is not connected or kindly explain where feedback is taken and repost the circuit diagram because the components values are not clear. Thanks for this circuit highly appreciated.
ReplyDeleteCan I use n channel musket with this circuit
ReplyDeleteHello can I use n Chanell musfet in this circuit
ReplyDeleteThe components value cannot be see clearly. Please upload the circuit diagram again.
ReplyDeleteIt is that same circuit that use the sg3524 ic and the p channel musfet irf4435
ReplyDeleteI like your post, but the diagram and number labels are vague when enlarge, hence can not be duplicated and tested. Please repost a clear one. Thank you
ReplyDeleteHow sine wave is generated. Pl elaborate on this.
ReplyDeleteGood write up. Please send me diagram - paobot57@gmail.com
ReplyDeletePls the number of transistor Q1 in the diagram
ReplyDeleteplease could you explain how the sinewave was generated.
ReplyDeletePls which transistor is suitable for Q1, the pnp ?
ReplyDeletePls which transistor is suitable for Q1, the pnp ?
ReplyDeleteMy email is :babalolagbenga01@gmail.com
Thank u so much sir the circuit diagram is work perfectly well I turn it to 24v DC using 7812.
ReplyDeleteIt power all my appliancee.
You are welcome
ReplyDeleteI need your help
ReplyDeleteMy email address is olami.opeyemi2019@gmail.com
DeletePls sir can I use a smps transformer(ferrite coil) for the circuit.
ReplyDeletedoes the ic sg3524 consists of dead time control
ReplyDeletehello sir, can i get the complete diagram of the circuit? i really need this for my MTECH project. My email id is - jenifermanta35@gmail.com
ReplyDelete