Inverter And Its Application In The Interference Suppression - Inverter Technology - Hc Network

1 Introduction Frequency Control is a control technology

, microelectronics, power electronics, and communications technologies in one high-tech technology. It is in very good speed, energy-saving performance, in all walks of life to get a wide range of applications. Since its soft launch, can reduce the impact of equipment and electrical machinery, equipment and motor life extension. With the rapid development of science and technology, with its power-saving frequency converter, energy saving, reliable and efficient characteristics applied to all areas of industrial control, such as frequency control in water supply, air conditioning, process control, elevators, machine tools etc. The application of the regulation to ensure accuracy, reducing labor intensity and improve economic efficiency, but also brought along some of the interference problem. Power supply and electrical equipment on site will affect the inverter, inverter run-time generated high harmonics can interfere with the operation of surrounding equipment. Inverter generated disturbances are mainly three types: interference with electronic equipment, jamming and communications equipment, such as production of radio interference. Automatic control devices on the computer and electronic equipment generated interference is mainly induced interference; on communications equipment and radio interference generated by such as radioactive interference. If the frequency converter to solve the interference problem is not good, not only the system can not reliably, but also affect other electrical and electronic equipment to work properly. So it is necessary inverter applications, the interference problems discussed in order to promote its further expand the applications. The following focuses on the interference frequency converter and its Suppression. Frequency Control System

2 major sources of electromagnetic interference, and way

2.1 Main sources of electromagnetic interference

Electromagnetic interference, also known as electromagnetic interference (EMI), is the external noise and unwanted signals at the receiver caused by electromagnetic interference, is usually conducted through the circuit and in the form of field communication. Rectifier bridge inverter is non-linear load on the grid, it will generate the same power harmonics and other electrical and electronic equipment generates harmonic interference. In addition, most of the frequency converter using PWM inverter technology, as its work in switching mode and for high-speed switching, producing a large number of coupling noise. Therefore, the inverter of the system to other electrical and electronic equipment is a source of electromagnetic interference. On the other hand, the harmonic interference in power inverter power supply, mainly through interference with frequency converter. There are a lot harmonic power source, such as various rectifier equipment, exchange equipment, AC and DC electronic voltage regulation equipment, non-linear loads and lighting equipment. These loads have to make the grid voltage and current waveform distortion produced, so the other devices on the network harm interference. Inverter from the power supply be contaminated after the exchange of power interference, if not dealt with will power noise interference through the power inverter power supply circuit. Power supply interference on the inverter main overvoltage, undervoltage, instantaneous power-down; surge, fall; peak voltage pulse; RF interference. Second, the common mode interference by the inverter control signal line may interfere with the normal work of inverter.

2.2 channels of electromagnetic interference

The power inverter can produce large harmonics interfere with other devices on the system is strong. The interference means electromagnetic interference with the general approach is consistent with the main points of electromagnetic radiation, conduction, inductive coupling. Specifically as follows: the surrounding electronics, electrical equipment produces electromagnetic radiation; direct drive motor with electromagnetic noise, makes the motor iron loss and copper consumption to increase, and conducted interference to the power transmission to the system through the distribution network of other equipment; Inverter other lines of adjacent coupling is induced, induced the interference voltage or current. Similarly, the interference signals within the system the same way interfere with the normal operation of inverter. The following were analyzed.

(1) electromagnetic radiation Inverter if it is not in a fully enclosed metal casing, it can radiate electromagnetic waves through space. The radiation field strength depends on the interference of the current intensity, the device of equivalent radiation resistance and firing frequency interference sources. Rectifier bridge inverter is non-linear load on the grid, it generates harmonics on the same network access to other electronic, electrical equipment generates harmonic interference. Most inverter bridge inverter using PWM technique, when the frequency and amplitude according to the given instructions and repeat the expected switch mode, its output voltage and the current power spectrum is discrete, and corresponding with and switching frequency The high-order harmonic group. High carrier frequency and field control of high-speed switching devices switch (dv / dt up to 1kV/ s above) interference caused by radiation has been outstanding.

When the frequency converter with cracks or holes in metal case, the radiation intensity and the interference signal wavelength, when the size of the pores and close to the wavelength of electromagnetic wave, it will interfere with the surrounding radiation sources. The radiation field in the metal object may also be formed secondary radiation. Similarly, inverter converter outside the radiation can interfere with normal work.

(2) conduction The addition of electromagnetic interference with its wires connected to the external launch, can also be coupled, or ground loop impedance coupled to interference into other circuits. Compared with the radiation interference, its spread can be very far away. The typical means of transmission is: low-voltage network access from the industrial inverter interference signal will be generated along the medium voltage distribution transformers into the network, and along the other end of distribution transformer entered civil low voltage distribution network to access Since the civil power distribution bus of the electrical equipment into remote victims.

(3) inductively coupled Induction coupling between radiation and conduction between the third route of transmission. When the low frequency interference, electromagnetic interference radiation is very limited, and the interference source not directly connected with the other conductor, but this time the energy of electromagnetic interference by the inverter input and output wires and other adjacent wire or conductor produce inductive coupling, in the neighboring wire or conductor induces a current or voltage interference. Inductive coupling can be capacitive coupling between conductors form can also form or by inductive coupling capacitors, inductors mixed form, which is the source of interference in the frequency and the distance between the adjacent conductors and other factors.

3 measures against electromagnetic interference

According to the basic principles of electromagnetic form of electromagnetic interference (EMI) must have sources of electromagnetic interference, electromagnetic interference means electromagnetic interference-sensitive systems on the three elements. To prevent interference, hardware and software can be used anti-interference measures. Among them, the hardware is the most fundamental and anti-jamming

by: gaga

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