Frequency conversion technology is the background of AC motor stepless speed regulation of the wide range of needs. The traditional DC speed control technology due to the large volume failure rate and limited application.
Since the 1960s, the use of thyristors and their upgraded products has been widely used in power electronic devices. But its speed performance is far from being able to meet the needs. 1968 to Danfoss as the representative of the high-tech enterprises began to mass production of frequency converter, opened a new era of industrial inverter.
Since the 1970s, pulse width modulation (PWM-VVVF) speed control research has been a breakthrough, the 20th century, 80 years after the refinement of the microprocessor technology makes a variety of optimization algorithms can be easily achieved.
The late 80s of the 20th century, the United States, Japan, Germany, Britain and other developed countries VVVF inverter technology practical, commodity into the market, has been widely used. The earliest inverter may be the Japanese bought a British patent developed. However, the United States and Germany by virtue of electronic components production and electronic technology advantages, high-end products quickly seize the market.
Into the 21st century, the gradual rise of domestic frequency converter, has now gradually seize the high-end market. Shanghai and Shenzhen to become the forefront of the development of domestic frequency converter.
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