# What is the difference in applying dc input and sine wave input?

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### 👋 What happens if the input is a sine wave?

- So what happens if the input to a linear system is a sine wave? The output is another sine wave, with the same frequency, but with different amplitude and phase. If your system produces a new frequency…. it’s not linear. Here is why….

- How to draw pure sine wave input to rectifier?
- What is the difference between pure sine wave and stepped sine wave?
- What is output of not gate if sine wave is input?

### 👋 How to produce sine wave from dc input?

Depending on power and spectral purity requirements, production of a sinusoidal wave from a DC input can be done with several methods:

- You could use a DC to AC motor/generator set
- You could use an inverter
- You could create a square wave and then remove all the odd harmonics with a low-pass filter (This is a variation on the inverter)
- You could create an ascillator using some kind of RLC circuit
- You could create the sine wave digitally and convert digital to analog with a converter (The creation could be by table lookup or fourier series, possibly using a computer, possibly with the DAC followed up by a low-pass filter to smooth out even more.)

- What is the difference between sine and sine wave in dsp?
- What is the difference between stepped sine wave and square sine?
- What's the difference between a pure sine wave and modified sine wave?

### 👋 How do you input a sine wave in simulink?

- On the Sine Wave block dialog box, set Time to Use external signal so that an input port appears on the block icon.
- Connect a clock signal to this input port using a Digital Clock block.

- What is the difference between sine wave and cos wave?
- What is the difference between a modified sine wave and pure sine?
- What is the difference between a pure sine wave and modified sine?

1 other answer

It isn't clear what you are applying the input to. The results may vary, depending on the specific circuit.

We've handpicked 23 related questions for you, similar to «What is the difference in applying dc input and sine wave input?» so you can surely find the answer!

What is the difference between modified sine waves and sine wave inverters?- Sine
**wave**inverters**with**more than three steps in the**wave**output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or**square wave**(one step) types of the same power handling. Switch-mode power supply (SMPS) devices, such as personal computers or DVD players, function on modified sine wave power.

- The difference with
**ring**modulation is that neither of the input signals, carrier or program, appear at the output. Therefore, ring modulation of two sine waves having frequencies of 1,500 Hz and 400 Hz, would produce two signals: one at 1,900 Hz, and one at 1,100 Hz.

- So what happens if the input to a linear system is a sine wave? The output is another sine wave, with the same frequency, but with different amplitude and phase. If your system produces a new frequency…. it’s not linear.

a phase shifted sine wave of a different amplitude.

Square wave inverters are usually used to support motors alone. Sine wave inverters are used to support household appliances such as refrigerators ovens, computers, laptops, etc. Square wave inverters **are less reliable and also unsafe to use for appliances**. Sine inverters are highly safe to use.

- A sine wave or sinusoid is a mathematical curve that describes a smooth periodic oscillation. A sine wave is a continuous wave… A cosine wave is said to be "sinusoidal", because cos ( x ) = sin ( x + π / 2 ) , {\\displaystyle \\cos(x)=\\sin(x+\\pi /2),} which is also a sine wave with a phase-shift of π/2 radians.

It is a square shape of the wave applied at the input of the circuitry> ANSWER: A square wave is basically two rectangular power input It is called square to differentiate from other sources triangular sawtooth and so forth.

- The
**most common AC waveform**is known as the sine wave. This wave is called a sine wave because the voltage series or current differs with the elapsed time’s sine. There is the modified sine wave and the true sine wave products.

- The same cannot be said of
**a**modified system, which produces**a**stepped approximation to**a sine wave**when on battery. Its output is choppier and provides equipment with**a**less stable output waveform. Note:**A**stepped**sine wave**and a square sine wave are the same thing.

**Harmonics**are sometimes also called "overtones" and subharmonics are sometimes called "undertones".**A sine wave**is considered to be the purest form**of wave**- it contains only one frequency and no harmonics.

Sine wave inverters are used to support household appliances such as refrigerators ovens, computers, laptops, etc. Square wave inverters **are less reliable and also unsafe to use for appliances**. Sine inverters are highly safe to use. Square wave inverters produce a very loud noise when used.

The difference is that sine waves represent SIMPLE HARMONIC MOTIONS while **triangular waves don't**. Triangular waves have a regular slope and start descend at a specefic point.

Inverter Tutorial and Frequently Asked Questions:Q: What is an inverter? An inverter takes DC power (battery or solar, for example) and converts it into AC "household" power for running electronic equipment and appliances.Q: How is an inverter different than a UPS? A UPS typically includes the battery and battery charger in one stand alone unit. However, there are UPSs that use external batteries, and PowerStream makes inverters with battery chargers, so the differences blurr as features proliferate.UPSs also can have communication with the equipment that it is powering letting the equipment know that it is operating on standby, giving it shutdown warning, or communicating with the human in the loop. Inverters typically don't have this communication.Q: Why are they called inverters? Originally converters were large rotating electromechanical devices. Essentially they combined a synchronous ac motor with a commutator so that the commutator reversed its connections to the ac line exactly twice per cycle. The results is ac-in dc-out. If you invert the connections to a converter you put dc in and get ac out. Hence an inverter is an inverted converter. For more information about such converters see http:/www.nycsubway.org/tech/power/rotary.HTML (thanks to Karl W.Berger, PE for this answer).Q: What if I want a DC output to run such things as a laptop from a car cigarette lighter, or telephone equipment at -48 volts? Then you want a DC/DC converter. PowerStream has some DC/DC converters just for those purposes. http:/www.powerstream.com/dcdc.htmQ: What is the difference between sine wave and modified sine wave? Alternating current (AC) has a continuously varying voltage that swings from positive to negative. This has great advantages in power transmission over long distances. Power from your power company is carefully regulated to be a perfect sine wave, because that is what naturally comes out of a generator, and also because sine waves radiate the least amount of radio power during long distance transmission.On the other hand, a sine wave is expensive to make in an inverter, and many sine wave techniques use heavy, inefficient transformers. The most inexpensive way to make AC is to switch the DC on and off--a square wave. A modified sine wave is scientifically designed to simulate a sine wave in the most important respects so that it will work for most appliances. It consists of a flat plateau of positive voltage, dropping abruptly to zero for a while, then dropping again to a flat plateau of negative voltage, back to zero for a while, then returning to the positive voltage. This pause at zero volts puts more power into the 60HZ fundamental than a simple square wave does, so it is called "modified sine wave" instead of "square wave."Q: Can I use a modified sine wave inverter for my medical equipment? For Medical equipment, oxygen generators, etc. talk to the manufacturer of the equipment. PowerStream inverters are never tested or rated with medical equipment, and we don't guarantee that they will work to save your life. For such applications please find inverters that are rated and tested for such applications.Q: What about square wave inverters? These old-fashioned inverters are the cheapest to make, but the hardest to use. They just flip the voltage from plus to minus creating a square waveform. They are not very efficient because the square wave has a lot of power in higher harmonics that cannot be used by many appliances. The modified sine wave is designed to minimize the power in the harmonics while still being cheap to make.Q: How do I know if I need a sine wave, or if I can live with a modified sine wave? The following gadgets work well with a modified sine wave: computers, motor-driven appliances, toasters, coffee makers, most stereos, ink jet printers, refrigerators, TVs, VCRs, many microwave ovens, etc.Appliances that are known to have problems with the modified sine wave are some digital clocks, some battery chargers, light dimmers, some battery operated gadgets that recharge in an AC recepticle, some chargers for hand tools (Makita is known to have this problem). In the case of hand tools, the problem chargers usually have a warning label stating that dangerous voltages are present at the battery terminals when charging. We would like to add to this FAQ any appliances that you have had trouble with, or had success with, using modified sine wave inverters.Q: Why do I hear buzzing on my stereo when using a modified sine wave inverter? Some inexpensive stereos use power supplies that cannot eliminate common-mode noise. These would require a sine wave inverter to operate noise-free.Q: Why don't I measure rated voltages when using a multimeter on my modified sine wave inverter?A. The rated voltage is an RMS (root mean square--they square the value to make sure it is always positive, then average it, then take the square root of the average to make up for having squared it in the first place) measurement. Most multimeters are designed to give correct RMS readings when applied to sine waves, but not when they are applied to other waveforms. They will read from 2% to 20% low in voltage. Look for a voltmeter that braggs about "True RMS" readings.Q: How should I select the right size inverter? First add up the power ratings of all the appliances, then buy the next larger inverter! At least that is the simple answer. Note, however, that some appliances, such as table saws, refrigerators, and microwaves have a surge requirement. PowerStream inverters are designed to supply such surges, but since every appliance has its own requirements sometimes you will need to get a bigger inverter than you would otherwise think. Note that the inverter isn't the only consideration when you are pondering the mysteries of start up surges. The battery must also be able to supply the surge power, and the cables must be able to supply the increased current without dropping the voltage too much.Q: How is a microwave rated for wattage? When you buy a microwave oven you want to know how intense the microwave field is, not how much the oven draws from the wall. So a microwave oven that boasts 600 watts on the box, will have 1200 watts on the boilerplate in the back. Don't be fooled!Q: Are stereo amplifiers rated the same way? Stereo manufacturers are bigger liars than politicians. Some times they use peak output power (milliseconds), sometimes they use power drawn from the wall, but often they just look at the competition's carton front and add 10%. However the truth is available: look at the boilerplate sticker, which has been evaluated by UL.Q: Why do I need such humongous cables to the battery when a small cord takes the AC output fine? Power is volts times amps (Watts = V x A). So if you have a lot of voltage you don't need many amps. Roughly you need 12 times as much current from the 12 volt battery as you need from the 110 volt AC outlet. Current is what causes cables to heat up, not voltage. That is why they use thousands of volts in power transmission grids. The thing to do when you have lots of current is to lower the resistance of the cable. The larger the wire the lower the resistance. Think of the cable as a water pipe. A big pipe (wire) can carry more water (current or amperage) with less pressure (voltage), and will present less pressure (voltage) drop from one end of the pipe to the other.Another consideration is how far the cable has to run from the battery to the inverter. Long cable runs are expensive, either in copper or efficiency, or both.Q: Why would you use a 24 volt inverter instead of a 12 volt inverter?A. At a given power rating a 24 volt inverter will need half the current as a 12 volt inverter. This makes the entire system more efficient, and since high current transistors are expensive, the inverter will be cheaper.Q: Should I use aluminum wire, or must I use copper? Aluminum is cheaper and lighter, but it also has higher resistance for a given gauge and is more difficult to connect to. If you are an expert in such things, or know one, and need the advantages that aluminum gives, go ahead. If not, why not use the best conductor, copper? (Silver is slightly better, but it is cheaper to use a larger diameter copper). To compare the two look at our web page http:/www.powerstream.com/Wire_Size.htm .Make sure to use good insulation, 90°C rated or better. Also, running two sets of parallel wires instead of one can cut down on the wire heating due to more surface area.Make sure to follow all applicable electrical codes. Inverters must be grounded properly, and treated with respect, since they put out potentially lethal voltage. A lot of smart people have worked for 100 years to develop rules which will keep you out of trouble if followed. These rules are called the national electrical code, and your friend the electrician has it memorized (or knows where to look it up).Q: Should I use a laser printer with an inverter? Only if you must. Laser printers use up a surprising amount of power (due to the heated rollers), and will discharge your battery faster than you expect, even on standby. If you do, make sure the inverter is rated for the power of the printer plus computer plus monitor. It doesn't do any good to have your computer brown out as soon as the the printer starts to print. Ink jet printers, on the other hand, use a surprsingly low amount of power.

A power inverter with square wave output is easier to make and more efficient than a power inverter with sine wave output, but many loads must have sine wave output to function properly (e.g. motors).

Inverters don't really put out nice, beautiful sine waves like you get out of an AC wall socket. Instead they chop DC current to APPROXIMATE the total current flow that a sine wave would carry at any instant in time. A "regular" inverter is like one you plug into a car's cigar lighter plug to run a small TV, or even the inverter in the Prius. The Prius inverter "chops" 500V DC to run the motors, providing "fake" AC. The chopper is either on or off. 500V or zero V. What a multi-level inverter does is have several voltage levels, 0, 250, or 500. So it can better approximate a sine wave than strictly an on/off, single level inverter. The more levels an inverter has, the more efficient it can be, less EMI/RFI generation, and so on. But it's also a LOT harder to build, more expensive, harder to control in software. Look for multi-level inverters to appear in electric vehicles in the next 5 years.

#### What is true sine wave?

- True Sine Wave: definition & compared to modified sine wave. One way to define a Sine Wave is as a mathematical curve that describes a
**smooth repetitive oscillation**. The two key words which showcase the uniqueness of a sine wave are: Any sine wave is repetitive in nature. After any fixed time period, also called a cycle, it repeats itself.

- 15-4: Alternating Current When a sine wave of alternating voltage is connected across a load resistance, the current that flows in the circuit is also a sine wave. The sine wave frequency of an alternating voltage is the same as the alternating current through a series connected load resistance. 15-4: Alternating Current

- The frequency spectrum of the
**white noise is**spread out evenly over the entire spectrum, whereas the**sine wave is**concentrated into a single spectral element, where it stands out clearly. Here**is**the Matlab/Octave code that generated that figure; you can Copy and Paste it into Matlab/Octave:

When it comes to output waveform, there are two types of UPS battery backup—the kind that produce **a pure sine wave** and the kind that produce a simulated or modified sine wave, also known as a pulse-width modulated (PWM) sine wave, when on battery power.

A pure sine wave has energy at only one frequency.Any other wave shape has energy at other frequencies in addition to the frequency of the obvious waveshape.If you add up enough sine waves with the right frtequencoies and amplitudes, they'll add up to form any shapeyou want, even a squarewave.

The sine wave is also called a sinusoid is a mathematical curve that describes the smooth repetitive oscillation.

- Battery mode (B) : the output of the dc voltage after the inverter is a square wave. Battery mode (B) : the output of impure
**sine wave**after the dc voltage passes through the inverter. Battery mode (B) : the output of impure sine wave after the dc voltage passes through the inverter.

- To put it simply, modified sine wave power reaches the device in square waves, whereas pure sine wave power flows in arching waves which are even and ‘pure sine’ waves. For modern devices, this is what they need to run efficiently, safely and noiselessly