Vladmir
Newbie level 2
i want to design a pure sine wave inverter, using a quadrature oscillator to serve as the sine wave gen. and a 555 timer and 2n3906 as the triangular wave gen. please how do i go about it.
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pure sine wave inverter
- Thread starter Vladmir
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The sinewave and triangle wave feed the inputs of a comparator IC. The output of the comparator will have the Pulse-Width-Modulation waveform that drives output Mosfets that drive a stepup transformer.
Your circuit should use output voltage regulation.
It is difficult to make a symmetrical triangle waveform with a 555. Usually a dual opamp is used, the first one is a Schmitt trigger and the second one is an integrator. They oscillate to make a perfect triangle wave.
Your circuit should use output voltage regulation.
It is difficult to make a symmetrical triangle waveform with a 555. Usually a dual opamp is used, the first one is a Schmitt trigger and the second one is an integrator. They oscillate to make a perfect triangle wave.
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1) The Exar XR2206 IC is not made anymore.
2) The output power of the XR2206 is extremely low. If a linear amplifier boosts its power then the amplifier will waste a lot of battery power making heat.
lw1ecp
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Just an idea: I once thougt of making a sinewave inverter this way: a quick-and-dirty unregulated DC-to-DC, suplying high voltage DC to a switching power stage, driven by a PWM created from sine values. An inductor in series with the output smooths the pulses into a continuous sine.
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Yes, some inverters use a DC to DC converter at a high frequency so the transformer is small with a ferrite core. Then they use high voltage Mosfets to switch the output with Pulse-Width-Modulation. The output filter is usually an LC, not just an inductor.
Vladmir
Newbie level 2
i got circuit online, but i'm having problems getting the calculations for the values of the resistor and capacitors used. i tried making use of the f=1/2*pi*RC formula but i don't seem to be getting a result.
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i though the waveform from the PWM is fed into two mosfet drivers and then used to drive the mosfet. i only have the output from the transformer in the dc to dc converter section being fed into the mosfet.
and you were right about the 555 timer, it gave me a sawtooth waveform instead.
- - - Updated - - -
i though the waveform from the PWM is fed into two mosfet drivers and then used to drive the mosfet. i only have the output from the transformer in the dc to dc converter section being fed into the mosfet.
and you were right about the 555 timer, it gave me a sawtooth waveform instead.
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