Friday, May 1, 2015

Schematic Diagram 250W PWM Inverter using SG3524 IC

Robotronicdiagram. - Do you want to built your own inverter to supply your electric energy now? schematic diagram like in figure 1 below will help you give reference to build 250 watts PWM (Pulse Wave Modulation) inverter based on SG3524 IC.

In this time we will give you you global description about Schematic Diagram 250W PWM Inverter using SG3524 IC like in figure 1 below.

Schematic Diagram

Schematic Diagram 250W PWM Inverter using SG3524 IC (Source: Circuitstoday)

Component Parts
  • The main component is SG3524 IC
  • All of components, see in figure 1 above.


Schematic diagram like in figure 1 above is Schematic Diagram 250W PWM Inverter using SG3524 IC. Switching regulation in this schematic diagram using SG3524 that has all essential circuitry required for making a switching regulator in single ended or push-pull mode.  Pulse width modulator, oscillator, voltage reference, error amplifier, overload protection circuit, output drivers etc build include in circuitries inside the SG3524. SG3524 IC 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.

The output voltage regulation section of the inverter circuit works as follows. The inverter output (output of T2) is tapped from point’s labelled b, c and supplied to the primary of the transformer T2. The transformer T2 steps down this high voltage , bridge D5 rectifies it and this voltage ( 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 R8, R9, R16 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 12) in order to bring back the output voltage to the desired value. Preset R9 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.

IC2 and its associated components produce an 8V supply from the 12V source for powering the IC and its related circuitries. Diodes D3 and D4 are freewheeling diodes which protect the driver stage transistors from voltage spikes which are produced when the transformer (T2) primaries are switched. R14 and R15 limit the base current of Q4 and Q7 respectively. R12 and R13 are pulldown resistors for Q4 and Q7 which prevents their accidental switch ON. C10 and C11 are meant for bypassing noise from the inverter output. C8 is a filter capacitor for the voltage regulator IC 7808. R11 limits limits the current through the indicator LED D2.

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