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The impedance of the common mode choke coil
inductor is proportional to the frequency, and the impedance of the
capacitor is inversely proportional to the frequency. Therefore, the
inductance can block the high frequency through, and the capacitor can
block the low frequency. The two appropriate combination, you can filter
a variety of frequency signals. If the rectifier circuit, the capacitor
and load or inductance in series on the load, you can filter out the
exchange ripple.
Inductor of common mode choke manufacturers is the current filter, is generated by the current through the electromagnetic induction to smooth the output current, the output voltage is low, generally lower than the effective value of AC voltage; for high current, the greater the current the better filtering effect. Capacitance and inductance of many features are just the opposite.
Low-frequency filter capacitor is mainly used for mains filter or transformer rectifier filter, the operating frequency and the mains of the same 50Hz; and high-frequency filter capacitor is mainly used in switching power supply after rectification filter, the frequency of several thousand Hz to several Million Hz. When we use low-frequency filter capacitor for high-frequency circuit, due to low-frequency filter capacitor high-frequency characteristics of poor, it is high frequency charge and discharge resistance is large, the equivalent inductance is high, so in use because of the electrolyte Frequent polarization and produce greater heat, and the higher the temperature will make the internal electrolysis of the capacitor gasification, the capacitor pressure increases, eventually leading to the capacitor drum and burst.
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Inductor of common mode choke manufacturers is the current filter, is generated by the current through the electromagnetic induction to smooth the output current, the output voltage is low, generally lower than the effective value of AC voltage; for high current, the greater the current the better filtering effect. Capacitance and inductance of many features are just the opposite.
Low-frequency filter capacitor is mainly used for mains filter or transformer rectifier filter, the operating frequency and the mains of the same 50Hz; and high-frequency filter capacitor is mainly used in switching power supply after rectification filter, the frequency of several thousand Hz to several Million Hz. When we use low-frequency filter capacitor for high-frequency circuit, due to low-frequency filter capacitor high-frequency characteristics of poor, it is high frequency charge and discharge resistance is large, the equivalent inductance is high, so in use because of the electrolyte Frequent polarization and produce greater heat, and the higher the temperature will make the internal electrolysis of the capacitor gasification, the capacitor pressure increases, eventually leading to the capacitor drum and burst.
More inductors in www.xp-elec.com
Reasons for choke coils
inductance saturation:
Electrons in the outer layer of the outer circle around the number of orbital rotation, each layer of electronic rotation will be in accordance with Leng's law to produce a weak magnetic field, each layer of magnetic force, the direction is different, but the resultant force is zero, no magnetic. When a coil through the current, the same law according to Leng a law of magnetic field, magnetic lines through the magnetic material (core), the magnetic material within the atomic rotation of the electrons began to turn to offset the coil generated magnetic lines, the greater the coil current, the more The direction of rotation of the magnetic material electrons changes, and finally all the magnetic material electrons are rotating in the same direction, that is, magnetic saturation.
The size of the inductance and the theoretical analysis of saturation by common mode choke manufacturers : The inductance of the hollow coil structure can be considered not saturated, with the inductance of the core circuit there is saturation problem. The inductance L becomes smaller as the magnetic circuit becomes saturated. The theoretical basis is as follows: Assuming the inductance winding equivalent turns N turns, the equivalent magnetic path length is len, the input current is I, the equivalent cross-sectional area of the magnetic circuit is S, μ is the magnetic permeability, Φ is the magnetic flux. By: Φ = B * S, B = μ * H, H * len = N * I and according to the definition of the inductor, available: L = N * Φ / I (see Sina / my collection / Electromagnetics / Inductance of the transient analysis) = N * (B * S) / I = N * (μ * H * S) / I = N * (μ * H * len * S) / (I * len) = N * Μ * N * I * S) / (I * len) = N ^ 2 * μ * S / len. When the current into the inductor is large, μ = B / H, H is large, B has reached the maximum value no longer changes, then μ tends to zero, so the corresponding inductance L also tend to zero.
Μ = magnetic permeability of material (Henrys / meter)
Magnetic permeability, also known as magnetic permeability, is a measure of the magnetic properties of a coefficient, expressed in the letter μ, the unit is Heng / m. Μ is equal to the ratio of the magnetic flux density B to the magnetic field strength H in the magnetic medium, that is, the relative permeability μr of the magnetic medium, which is defined as the ratio of the permeability μ to the vacuum permeability μ0, that is, μ = B / H.
more inductors and transformer in www.xp-elec.com
Electrons in the outer layer of the outer circle around the number of orbital rotation, each layer of electronic rotation will be in accordance with Leng's law to produce a weak magnetic field, each layer of magnetic force, the direction is different, but the resultant force is zero, no magnetic. When a coil through the current, the same law according to Leng a law of magnetic field, magnetic lines through the magnetic material (core), the magnetic material within the atomic rotation of the electrons began to turn to offset the coil generated magnetic lines, the greater the coil current, the more The direction of rotation of the magnetic material electrons changes, and finally all the magnetic material electrons are rotating in the same direction, that is, magnetic saturation.
The size of the inductance and the theoretical analysis of saturation by common mode choke manufacturers : The inductance of the hollow coil structure can be considered not saturated, with the inductance of the core circuit there is saturation problem. The inductance L becomes smaller as the magnetic circuit becomes saturated. The theoretical basis is as follows: Assuming the inductance winding equivalent turns N turns, the equivalent magnetic path length is len, the input current is I, the equivalent cross-sectional area of the magnetic circuit is S, μ is the magnetic permeability, Φ is the magnetic flux. By: Φ = B * S, B = μ * H, H * len = N * I and according to the definition of the inductor, available: L = N * Φ / I (see Sina / my collection / Electromagnetics / Inductance of the transient analysis) = N * (B * S) / I = N * (μ * H * S) / I = N * (μ * H * len * S) / (I * len) = N * Μ * N * I * S) / (I * len) = N ^ 2 * μ * S / len. When the current into the inductor is large, μ = B / H, H is large, B has reached the maximum value no longer changes, then μ tends to zero, so the corresponding inductance L also tend to zero.
Μ = magnetic permeability of material (Henrys / meter)
Magnetic permeability, also known as magnetic permeability, is a measure of the magnetic properties of a coefficient, expressed in the letter μ, the unit is Heng / m. Μ is equal to the ratio of the magnetic flux density B to the magnetic field strength H in the magnetic medium, that is, the relative permeability μr of the magnetic medium, which is defined as the ratio of the permeability μ to the vacuum permeability μ0, that is, μ = B / H.
more inductors and transformer in www.xp-elec.com
