Home > News > LATEST NEWS > What's The Difference between .....
Hot Products
Latest News

How to select portable power station for your CPAP machine when camping at outside.

How to select portable power station for your CPAP machine when camping at outside.

When a Pure Sine Wave Inverter Is Necessary

Most devices will work just fine without a pure sine wave inverter, but it is a good idea to think about the issue before making a purchase anyway.

How to choose a right portable power station?

How to choose a right portable power station?

the forest fire in California result 2 million people in power outage

the forest fire in California result 2 million people in power outage

Solar Generator Safety and Protection Fuction

With this function, Even though consumers connect this power station to the rooftop solar system (voltage over 25V, power over 200W), it will not cause any risk of fire and smoke, etc.

Solar Power Interenational 2019

On behalf of our company ,We hereby sincerely invite you and your company representatives to visit our booth at Salt Palace Convention Center from Sep 23rd to 26th,2019.

2019 Hong Kong Autumn Electronics Fair

On behalf of our company ,We hereby sincerely invite you and your company representatives to visit our booth at Wan Chai HK Convention and Exhibition Center from Oct 13th to 16th,2019.

Portable Energy Storage Solar Power Generator Buying Guide

Portable solar energy storage power sources have many advantages, but they are not suitable for all purposes. Ask yourself the following questions to determine if a portable solar energy storage power source is right for you and which type is best for your needs.

Frequently Asked Question for our solar power generators

Frequently Asked Question for our solar power generators

New Arrival Outdoor Camp Mobile Laptop Charging 300W Portable Solar Generator

This portable solar generator comes with internal MPPT controller system,which help charging efficient.

Intersolar Munich 2019

On behalf of our company ,We hereby sincerely invite you and your company representatives to visit our booth at Intersolar Munich 2019 from May 15th to 17th,2019

Hong Kong Spring Electronics Fair 2019

Here, we will visit the booth of the Hong Kong Convention and Exhibition Centre on behalf of you and your company from April 13 to 16, 2019.

What's The Difference between Pure Sine Wave and Modified Sine Wave?

What's The Difference between Pure Sine Wave and Modified Sine Wave?
Contact us
Address:Room 201,Unit 3,Jinhuwan Industrial Park NO.23,Fucheng Street, Longhua New District, Shenzhen,China
Mobile:+86-13823602850
Tel:+86-755-84553083
Fax:+86-755-23595925
Contact:Christal Chu
Skype:segre02
E-mail:segre02@sgrpower.com
Contact Now

News

What's The Difference between Pure Sine Wave and Modified Sine Wave?

pure sine wave inverters china factory

INVERTER

The primary job of an inverter is to convert the DC (Direct Current) power from the battery bank or solar panels to AC (Alternating Current) power needed for most appliances. To do that, it must take the constant DC voltage and change it to a sine wave curve that goes above and below 0 volts. When inverters first came out, the most common way to do this was to make the voltage go straight up and down, creating a blocky signal. This is called modified sine wave, seen in orange in the image below. More advanced modified sine waves make multiple steps, trying to come close to a pure sine wave.

DC Voltage, Modified Sine Wave, and Pure Sine Wave



power inverters china manufacturer


Modified Sine Wave and Pure Sine Waves on Oscilloscope

In the following images, you can see an output of a modified sine wave on an oscilloscope at the left. A Pure Sine wave is shown on the right(The yellow pure sine wave inverter is from Segre). Other than how the signal looks, what’s the difference between the two outputs?


china inverters factory

inverters china supplier


A modified sine wave inverter can be used for simple systems that don’t have any delicate electronics or audio equipment that may pick up the choppy wave and produce a hum. Old tube TVs and motors with brushes are usually ok with modified sine wave. Your digital clock will likely act funky, and battery rechargers quite often just plain won’t work. Some equipment may seem to be working fine, but may run hotter than with a pure sine wave and reduce the life of it.


Take heed if you’re considering buying a modified square wave inverter to shave a few bucks off your system costs. A whole raft of modern appliances won’t run as well and some not at all on this waveform:

· Laser printers, photocopiers, and anything with an electrical component called a thyristor

· Anything with a silicon-controlled rectifier (SCR), like those used in some washing machine controls

· A few laptop computers

· Some fluorescent lights with electronic ballasts

· Some battery chargers for cordless tools

· Some new furnaces and pellet heaters with microprocessor controls

· Digital clocks with radios

· Appliances having speed/microprocessor controls (like some sewing machines)

· X-10 home automation systems

· Medical equipment such as oxygen concentrators



china pure sine wave inverters wholesaler

power inverters china factory



In general, because the total harmonic distortion is higher in modified square wave inverters, motors will run hotter (less efficiently, consuming up to 30% more energy than with pure sine wave inverters), and likely not last as long. Additionally, a modified square wave inverter will often cause a “buzz” to be heard from audio devices and sometimes other appliances like ceiling fans and microwave ovens.


We liken using a modified sine wave inverter to running a car with square wheels versus a pure sine wave inverter like running a car with round wheels. In the first case the ride is going to be awful rough and depending on the sensitivity of the car’s occupants they may not survive the ride.