12/220V Converter With Sine Output

12V to 220V AC inverter

How it work :
The master oscillator, a voltage reference and comparator collected on DA2. External elements DD1 and DD2 repeated internal structure of the TL494, in the part that works is unstable at low frequencies (false positive D-flip-flop).

Further, using the low-pass filter suppresses the upper harmonics of the PWM. LPF consists of two parts. First-DA1.1, with a smooth lowpass characteristic curves. Second-DA1.2 notch filter with a frequency of 150 Hz suppression. The analysis shows that the PWM contains only odd harmonics of the first and, because such a filter is enough to form a “beautiful” sine (oscillogram 2). And, as the level of the first harmonic is almost linearly dependent on porosity, we obtain a well-managed with precision sine constant component equal to 2.5 V. Further, in addition we get the inverse sine (Pin 14 DA1.4).

In DA3, DA5, VT1, VT2 assembled the first channel of the VLF class D. The second channel, respectively, collected on DA4, DA7, VT3, VT4. At the output of the first and second channels are formed antiphase sine wave VLF (oscillogram 3).

The output of the transformer, a diode bridge fed on the feedback output voltage. Thus the output voltage stabilisator.

Specifications :
Input voltage 12 … 14V
output voltage 50 Hz 220 + /-2V
Max power 50W
Efficiency … 90%.

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 12/220VAC inverter car power inverter dc ac inverter inverter inverter 12v to 220v AC inverter circuit sine wave converter

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  1. author

    david nelson4 years ago

    Can this be changed to output 120 VAC at 60 hz eaisily without having to redesign the whole thing? Also can more mosfets be added for larger output rating? thanks

  2. author

    ramveer4 years ago

    I am maid 500watt sine wave inverterwith out using microcontroller but my main poblem is its all component not availble so pls give me its full component list with rating. am I wating come as soon as fast

  3. author

    Raimund Berger3 years ago

    I am from AUSTRIA, please excuse my English.
    3 questions: 1. HIP 6601 is difficult to buy, are other IC’s usable?
    2. I have troubles to define a detail in the circuit drawing, are R22 and R24 variable resistors with connection to the ground ( Connection R22/R23 respectively R24/R25)?
    3. What is the purpose of the a.m. variable resistors?


  4. author

    Mike Clems3 years ago

    Go to http://www.wakeafrica.com/electronics-projects and see the diagrams.

  5. author

    Arman2 years ago

    thank you for good information.

  6. author

    Andrew1 year ago

    Here is the original publication: http://radiokot.ru/circuit/power/converter/19/
    Original discussion: http://www.radiokot.ru/forum/viewtopic.php?t=28822 (you may use Google Translate from Russian although it’s far from perfect in this case)
    (Note that some annotations on the diagram at the top of this page are in Russian, it’s because the original scheme “made in Russia” :))

    Main disadvantage of such schematics is a huge low-frequency transformer, main advantage is a reliability (provided the device is developed correctly).