洛阳理工学院毕业设计论文
参考文献
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[9] 刘凤君.逆变器用整流电源[M].北京：机械工业出版社，2003.10 [10] 何希才.新型开关电源设计与维修[M].北京：国防工业出版社，2001.1
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洛阳理工学院毕业设计论文
[18]Do,S.. A GUI based simulation of power electronic
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洛阳理工学院毕业设计论文
外文资料翻译
Impedance and matching the instigation of the load impedance and amplifier output impedance proper co-ordination in order to get the maximum output power, this right with impedance than the impedance matching. Transformer has been able to achieve impedance matching, because when properly selected, the number of turns of the secondary side coil, the transformer turns ratio, you can get the proper output impedance, that is, the transformer has to transform the role of impedance, so he can achieve impedance matching.
Impedance literally and resistance is not the same, only one of them blocking the word is the same, and the other anti-word? Simply put, the impedance is the anti-resistance power, so called impedance; exhaustive little to say, the impedance is the resistance, capacitance and inductance anti-anti-in on vector and. In the DC world, the objects on the current role in obstructing called resistance, all the material has a resistance, but resistance value of the size difference. Resistance small matter called a good conductor, the resistance of a material called non-conductors, superconductors, high-tech field, said recently it is a resistance value close to zero things. In addition to the resistance will impede the current in the field of AC capacitors and inductors will impede the flow of current, this effect is called reactance, that is resistant to current role. The reactance of the capacitor and inductor are called capacitor anti-inductive reactance, referred to as the capacitance and inductance. Their units of measurement and resistance as OM, the size of its value and the frequency of the alternating current relationship, the higher the frequency capacitance smaller inductance the greater the frequency the lower the capacitance the greater the inductance one . In addition, the capacitive reactance and inductive reactance, there is the phase angle, with the vector relationship, so when he says: Impedance is the resistance and reactance in the vector and the matching conditions
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洛阳理工学院毕业设计论文
① load impedance equal to the source impedance, that they mold with pieces of angle equal, when the load impedance can be obtained without distortion of the voltage transmission.
② load impedance of the source impedance equal to conjugate value, that they mold the same convergence angle of zero. Then can get the maximum power load impedance .This matching condition is called the conjugate match. If the source impedance and load impedance were purely resistive, then the two matching conditions are equivalent.
Impedance matching is the load impedance and excitation source internal impedance adapter with each other, to get the maximum power output of a working state. Matching condition is not the same for the different characteristics of the circuit. In a purely resistive circuit, when the load resistance is equal to the internal resistance of the excitation source, the output power is maximum, this state is called the match, otherwise known as the mismatch.
When the excitation source impedance and load impedance contains the electrical resistance to ingredients to make the load to get the maximum power load impedance and internal resistance must satisfy the conjugate relations, namely equal to the resistor composition, the reactance ingredients absolute value equal and opposite sign. This matching condition is called the conjugate match.
Impedance matching (Impedance matching and) is part of the microwave electronics, mainly used for the transmission line, up to all of the high frequency of the microwave signal the transmitted to the purpose of point of load, there will be no signal reflected back to the point of origin so as to enhance energy benefits. Smith chart, capacitive or inductive load in series to increase or decrease the load impedance values, the point on the chart will be walking along the circle represents the real resistance. If the capacitance or inductance grounding, the first point on the chart will be rotated 180 degrees in order to center, before walking along the resistance circle, and then rotated
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洛阳理工学院毕业设计论文
180 degrees along the center. Repeat the above method until the resistance value become one, you can directly to the resistance force becomes zero completed match.
Conjugate match
In the case of the source given, the power depends load resistor and the signal source resistance ratio K, when the two are equal, as K = 1, the maximum output power. However, the concept of impedance matching can be generalized to AC circuits, to achieve the maximum transmission power when the load impedance and source impedance conjugate, if the load impedance conjugate matching conditions are not met, it is necessary between the load and source an impedance transformation network, the load impedance transformation to the conjugate of the signal source impedance, and impedance matching.
Match classification
Generally, impedance matching, there are two, one, the other is to adjust the wavelength of the transmission line (transmission line matching and by changing the resistance force (lumped-circuit matching and)).
To match a set of lines, the first point of load impedance values, divided by the transmission line characteristic impedance values normalized, and then the value designated in the Smith chart.
1 change the resistance force
Capacitive or inductive load in series to increase or decrease the load impedance values, the point on the chart will be walking along the circle representing the resistance of the real number. If the capacitance or inductance grounding, the first point on the chart will be rotated 180 degrees in order to center, before walking along the resistance circle, and then rotated 180 degrees along the center. Repeat the above method until the resistance value one, you can directly to the resistance force becomes zero completed match.
2 adjust the transmission line
Long transmission line from the point of load to the point of origin to the
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