Where is the difference between soft starter and converter?
The high voltage soft starter must have a high performance control core that can handle the signal in a timely and rapid manner. Therefore, this control core usually uses high performance DSP chips instead of ordinary microcontroller cores of low voltage soft starter. Low voltage soft starter. The main circuit is composed of three sets of thyristor in reverse connection. But in the high-voltage soft starter, because of the shortage of the capacity of the single high voltage thyristor, it must be divided into several high voltage thyristors for partial pressure. However, the performance parameters of each thyristor are not exactly the same. The inconsistency of the thyristor parameters can cause the thyristor to break out of time, resulting in damage to the thyristor. Therefore, in the selection of thyristors, it is necessary to ensure that each phase of the thyristor parameters as consistent as possible, and each phase of the thyristor RC filter circuit element parameters as consistent as possible.
The utility model is mainly composed of a three-phase anti parallel thyristor connected in series between the power supply and the controlled motor, and an electronic control circuit thereof. Different methods are adopted to control the turn-on angle of the three-phase anti parallel thyristor, so that the input voltage of the controlled motor varies according to different requirements, and different functions can be realized. Frequency converter (Variable-frequency, Drive, VFD) is the application of frequency conversion technology and microelectronics technology, by changing the power supply frequency of the motor to control AC motor power control equipment. The frequency converter is mainly composed of rectifier (AC DC converter), filter, inverter (DC AC converter), brake unit, drive unit, detection unit, micro processing unit and so on. Inverter by internal IGBT drive voltage and frequency off to adjust the output power, the power supply voltage required to provide according to the actual needs of the motor, so as to achieve the purpose of speed, energy saving, in addition, there are a lot of protection drive, such as over-current, over-voltage, overload protection and so on. With the continuous improvement of the degree of industrial automation, inverter has also been widely used. Soft starter and converter
Are two completely different uses of the product. The inverter is used for the need for speed place, its output voltage and frequency change not only change; the soft starter is actually a regulator for motor starting, output voltage and frequency change not only change. Inverters have all of the soft starter functions, but they cost much more than soft starters and have a much more complex structure.
The soft starter changes the supply voltage only and is equivalent to a step-down starter. The frequency converter is much more complex and much more expensive than the soft starter. The inverter also has a soft start function, which is achieved by changing the power frequency. Difference between high voltage starter and low voltage starterThe main circuit of the soft starter is thyristor, and the start-up process is completed by gradually changing the turn-on angle of the thyristor. This is the basic principle of the soft starter. In the low-voltage soft starter market, a wide range of products, but high voltage soft starter products are still relatively small. High voltage soft starter is the same as low voltage soft starter, but there are some particularities in high voltage soft starter and low voltage soft starter:
High voltage soft starter work in high voltage environment, the insulation performance of all kinds of electrical components must be better, and the anti-interference ability of electronic chip is stronger. When the high voltage soft starter is composed of an electric cabinet, the layout of the electrical components and the connection with the high voltage soft starter and other electrical equipment are also very important.
