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In newer AC drives, the transistors may be replaced by insulated gate bipolar transistors (IGBTs). The IGBTs are used because they can be switched on & off at much higher frequencies -- aka the switch frequencies -- that don& acute;t conflict with other signals. The higher frequencies are also used outside of the audible range for humans, so the AC drive will not emit a hum that humans can hear. Typical switch frequencies are 3KHz to 4KHz. (With an older, SCR-based AC drive, switch frequencies are 250 to 500 Hz). As one can imagine, the higher the switch frequency, the smoother the output waveform & the higher the resolution. However, higher switch frequencies decrease the efficiency of the AC drive because of increased heat in the power devices.
The diagram below shows two pairs of IGBTs used to produce two phases of a typical output section for an AC drive using IGBTs instead of bipolar transistors. From this section one can see that one IGBT of each pair is connected to the positive bus & a second is connected to the negative bus. The IGBTs operate similarly to the transistors in that they are cycled on & off at high frequencies within the overall waveform of a sine wave.
Insulated gate bipolar transistors (IGBTs) connected to the output stage of the AC drive. The IGBTs are used instead of traditional bipolar motor transistors in newer drives. Image courtesy of Philips electronics. Follow AC drive on Facebook.
AC Drives Manufacturers
Address: No.2 Xuwu Gongle Xixiang, Bao'an District, Shenzhen, Guangdong, China, 518000
Tel: 0086-755-28480223
We are a National Hi-Tech enterprise specializing in variable frequency drive, frequency inverter, motor speed controller, ac drive, variable speed drive of R&D, manufacturing, sales and service. We have more than 300 staffs with high percent professional technical persons in industrial control field. And, we can make customized ac drive according to customer? special demand in different industries, like crane, oil, plastic, CNC machine, textile, metal, chemical, municipal engineering, etc. We continually import advanced technology around the world, and set up cooperation alliances with many scientific research institutions and colleges. Our factory production lines have many automation production lines and approved of ISO9001:2008, CE certifications. Our self-developed frequency inverter, ac drives are with powerful functions, flexible control and excellent performance which can meet all kinds of customers?demand of machinery and matching and system integration. With the high quality products to win customer? recognition, meanwhile, we offer high quality services to gain the trust of customers. We take tech-centric policy and continuous innovate, and obtain many patents of inventions, appearance design and utility model. our variable frequency drive are exported to Southeast Asia, India and Pakistan, the Middle East, Africa, Europe and America etc. We have a professional technical service team to provide the omni-directional technical service and support for customers.
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