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Power Interference Technology


Core, not only to increase the material strength of anti-saturation and the resistivity of the core increase of several orders of magnitude than the original and isotropic, the metal magnetic material can not be changed for use in high frequency defects. This is all in foreign countries are using differential mode filter inductor magnetic cores, ferrite cores instead of the reasons for the opening. Due to the different properties of materials the absorption band of the interference signal is not _-like, anti-interference filter in the development of special attention when the choice of filter inductance. Not only to choose the appropriate magnetic, but also used for the magnetic band attenuation required. Currently there are a lot of interference filters on the market, many of them relatively good performance can be directly used as needed. Electronic Engineering If you join after the interference filter is still not ideal, detailed examination of common ground will have the length, diameter is appropriate. Because the ground inductance will affect the distribution of interference suppression. 2.2 Isolation and quarantine laws mainly shielded isolation transformer,[link widoczny dla zalogowanych], shown in Figure 5. As a relatively common mode interference is the interference of the earth, so it is mainly through the coupling capacitance between the transformer windings to pass. If the primary and secondary shield inserted between, and make good ground, it will cause interference voltage pass out through the shield, thereby reducing the interference of the output voltage. Transformer with the shield in theory can reach 60dB attenuation around. But the isolation is good or bad often depends on the shield technology. The best selection of 0.2mm thick copper plate, primary, secondary side of each plus a shield. Typically, the primary side of the shield through a capacitor with the secondary shield wired together, and then received the secondary side of the ground. Can also access the original edge of the primary shield the ground, the Deputy Vice-side edge of the shield ground connection. And the ground lead of the larger cross-sectional area also good. By isolation transformers with a shield, is a good way, but larger. 1:13 extended 1:1 la) single-shielding layer (b) Figure 5 with a double shield isolation transformer shield 2.3 Absorption Absorption mainly absorbing device will absorb the voltage spike interference. Absorbing devices have a common characteristic, that is presented below the threshold voltage high impedance, and once above the threshold voltage, the impedance will drop sharply, so the peak voltage to some extent. Such absorbing devices are varistors, gas discharge tube, T tube, solid discharge and so on. Absorbing devices of different voltage suppression on the peak has its own limitations. Varistor current absorption capacity is not big enough; gas amplification power tubes slow. T (TransientVoltageSuppressor) is a new and efficient absorption into the line peak pulse power devices. T, also known as TvP, Chinese translation transient voltage suppressors, in fact, a special regulator diode. When it ends subjected to high-energy shock moment, it ends a very high speed to the impedance between the impedance from high to low impedance, absorbing a large current, thereby clamping the voltage across it in a predetermined value, the protection of the back of the circuit components from the impact of transient high-voltage spikes. Because of this, the mine was also very effective. T tube and regulator, is the reverse applied. The difference is that with the regulator, T tube can withstand even the maximum peak current up to hundreds of amperes, the maximum pulse power up to 5000W, clamping response time of only 1 × 102S. Figure 6 is T,[link widoczny dla zalogowanych],, S for general power line schematic. TvS used here is two-way pipe, it is the peak for the grid voltage and lightning impulse voltage can be superimposed effective absorption. Tvs various purposes, it can be used as lightning protection devices and a variety of high-power and absorption circuit. Dan word: the power of anti-jamming technology, a common circuit 3 Conclusion output ~ a T, VP1IT'L - one by one. A 'b full protection of control power supply voltage protection circuit 6TVS and peak output power of the interference suppression circuit design should be based on different applications, to take corresponding measures. In practice, we must pay attention to the good earth, for large power equipment, and interference with a large concentration of industrial field, it should be as little as possible to use site-frequency power supply. Non-power supply line to supply electricity or non-power low-voltage transformer directly from the \References King level, Fumin Jiang. Switching power supply. Xidian University Press,[link widoczny dla zalogowanych], 1997, Chen Keming. Whole selection of electronic components. Global Electronics,[link widoczny dla zalogowanych], 1998. Ma Guowei. High reliability communications DC / DC power module design and production. Annual meeting of the National Power Technology Proceedings, 1997, Licheng Zhang,[link widoczny dla zalogowanych], Shu-Fang Wang. New UPS uninterruptible power supply principle. Electronic Industry Press. 1995
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