(this post is automatically translated from the original Italian version for your convenience. Sorry in advance for errors)
This type of inverter is composed conceptually of two stages, the first raises the voltage from 12 Volts to a voltage of about 300Volt.
This voltage inverter in the simplest and usually cheapest, also called "modified sine wave" (modified sine wave), is simply modulated by two digital signals, one controls the polarity and the existence or otherwise of an output voltage. The result is that output is something that is more like a square wave than a sine wave.
In pure sine wave inverter (pure sine wave) the second stage is more complex, the voltage of 300 volts is the first stage pulse modulated (PWM) at a very high frequency and then filtered, the result is that output has a sinusoidal voltage whose quality is often superior to that network.
OK but what does this mean?
The first thing to say is that the engines are made to work with a sinusoidal voltage, fed with a square wave them in danger, so if we need to feed something that has a motor (drill, refrigerator, grinding, etc.) we need a " pure sine wave ".
Several other devices may have problems if they were fed a non-sinusoidal wave, such as HI-FI, lamps with "dimmer", devices that use processors in the level of power, etc. ..
What can be seen commonly in audio devices is a buzz due to the harmonics of the square wave input.
What can we feed then with a 'modified sine wave inverter?
In theory, everything that has an input stage switching should be fed with a modified sine wave, (TV, computers, chargers, etc.), but it must be said that these devices are designed to operate with a sinusoidal voltage and with this test.
Feed them with something that is not sinusoidal, unless it is explicitly written in the manual in my opinion not a good idea and could still damage the long run.
Personally with a "modified sine wave" we eat only incandescent bulbs!
So why buy a "modified" instead of "pure"?
Surely for the price, the same power the first cost a fraction of that cost the latter.
My advice is always possible to opt for a pure wave, it is true that costs more but when we connect something we are confident that we are fed with the specifications.
Regarding power, it should be chosen depending on what food we should, for inductive loads such as motors used have a power even 5 times the nominal absorption starting, otherwise the non-starting of the engine and the block of 'inverter.
However, it's good not to operate the inverter at 100% of its rated power, if you feed a TV consumes 150W, just get at least a 300W, naturally pure sine wave, D
Modified sine wave inverter or pure which to choose
The inverter is an electronic device that converts a current into an alternating current voltage to the same or a different voltage.
On the market there are several low-cost inverter that plugged into the cigarette lighter 'car, "transform" the voltage 12Volts AC voltage to 220 volts to power electronic devices to low power.
This type of inverter is composed conceptually of two stages, the first raises the voltage from 12 Volts to a voltage of about 300Volt.
This voltage inverter in the simplest and usually cheapest, also called "modified sine wave" (modified sine wave), is simply modulated by two digital signals, one controls the polarity and the existence or otherwise of an output voltage. The result is that output is something that is more like a square wave than a sine wave.
In pure sine wave inverter (pure sine wave) the second stage is more complex, the voltage of 300 volts is the first stage pulse modulated (PWM) at a very high frequency and then filtered, the result is that output has a sinusoidal voltage whose quality is often superior to that network.
OK but what does this mean?
The first thing to say is that the engines are made to work with a sinusoidal voltage, fed with a square wave them in danger, so if we need to feed something that has a motor (drill, refrigerator, grinding, etc.) we need a " pure sine wave ".
Several other devices may have problems if they were fed a non-sinusoidal wave, such as HI-FI, lamps with "dimmer", devices that use processors in the level of power, etc. ..
What can be seen commonly in audio devices is a buzz due to the harmonics of the square wave input.
What can we feed then with a 'modified sine wave inverter?
In theory, everything that has an input stage switching should be fed with a modified sine wave, (TV, computers, chargers, etc.), but it must be said that these devices are designed to operate with a sinusoidal voltage and with this test.
Feed them with something that is not sinusoidal, unless it is explicitly written in the manual in my opinion not a good idea and could still damage the long run.
Personally with a "modified sine wave" we eat only incandescent bulbs!
So why buy a "modified" instead of "pure"?
Surely for the price, the same power the first cost a fraction of that cost the latter.
My advice is always possible to opt for a pure wave, it is true that costs more but when we connect something we are confident that we are fed with the specifications.
Regarding power, it should be chosen depending on what food we should, for inductive loads such as motors used have a power even 5 times the nominal absorption starting, otherwise the non-starting of the engine and the block of 'inverter.
However, it's good not to operate the inverter at 100% of its rated power, if you feed a TV consumes 150W, just get at least a 300W, naturally pure sine wave, D
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You are reading "modified sine wave inverters and pure which to choose," a post from Fabrizio Zellini
- Published
- January 6, 2010
- Categories:
- electronics
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