Square wave inverters:

Application: emergency power places, travel, shopping, wild.
 

Step wave inverters:

Use: most commercially available high-frequency wave inverter can provide. Such quasi sine wave inverter can be used in notebook computers, televisions, stereos, camcorders, digital cameras, car refrigerator, printers, all kinds of chargers, Palm on the brain, game consoles, DVD players, mobile DVD.

1. AC power inverter output frequency, can be divided into the frequency inverter, inverter frequency and high frequency inverter. Frequency inverter frequency inverter for 50~60Hz; if the frequency inverter is generally 400Hz to more than 10 kHz; high frequency inverter frequency-typically more than 10 kHz to MHz.

2. According to the phases of the inverter output, can be divided into single phase inverter, three-phase inverters and inverter.

3. where according to the inverter output power can be divided into active and passive inverter inverter. Inverter output power to the industrial grid inverters, known as active inverter where the output power of the inverter output to a certain electricity load of inverter is known as passive inverter.

Filter Fan Units are widely used in clean production environments to ensure particle free air circulation. The effectiveness of contamination control and the operating costs depend strongly on the design of these units. The units are installed within the system's ceiling or floor grid. Large cleanrooms require a proportionally large number of FFUs, which in some cases may range from several hundred to several thousand. Units often contain their own pre-filter, HEPA filter and internally controllable fan air distribution.

 

FFUs are typically manufactured in 4' x 2', 3' x 2', or 2' x 2' steel housings, which can be placed in ceiling grid bays of similar dimensions. Units often contain a pre-filter as well as a HEPA (high-efficiency particulate air), ULPA (ultra-low particulate air) or other MERV (minimum efficiency reporting value) filter. A motorized fan is used to pull air through the filters for distribution to rooms or enclosed work stations such as hoods. Fan speed is typically controlled via a step-wise or rheostat motor adjustment. Desired cleanliness levels determine the filter used: HEPA filters remove particles 0.3 um or larger at 99.99% efficiency, while ULPA filters remove particles 0.12 um or larger at 99.999% efficiency. FFUs are engineered for laminar air flow, as is required in critical environments. Controlled air flowing in a uniform direction and speed (carrying microparticles) is cleaner than turbulent air that flows in multiple directions or at inconsistent speeds. Eddies created by turbulent air cause contaminating microparticles to settle on clean surfaces.