What is the formula for input impedance?

Input impedance is defined as the ratio of the voltage and current at the pair of the input antenna terminals:(2.105)Za=Ra+jXa, where Ra is the resistance at antenna terminals and Xa is the reactance at antenna terminals.

What is the formula for buck converter?

For the boost converter, V out ≈ 1 / 1 − D V g ; for the buck–boost, V out ≈ − D / 1 − D V g , i.e., the buck is a stepdown voltage circuit (as 0 < D < 1), the boost is a stepup, and the buck–boost, with an inverse output voltage, can either step up or step down the line.

How do you calculate the input power of a buck converter?

Hence, if output power is 10 watts, the input power will be about 11 watts. If input voltage is 30 volts then the input current will be 10 watts / 30 volts = 333 mA. Show activity on this post. For a lossless buck converter (reasonable first pass assumption), the input power his equal to the output power.

What is the formula for the output voltage for buck boost converter?

What is the formula for output voltage for Buck-Boost converter? Explanation: The output voltage of the buck-boost converter is Vo = D×Vin ÷ (1-D). It can step up and step down the voltage depending upon the value of the duty cycle.

How do you find the input impedance of a transmission line?

The input impedance of a terminated lossless transmission line is periodic in the length of the transmission line, with period λ/2. Not surprisingly, λ/2 is also the period of the standing wave (Section 3.13).

How do you calculate the switching frequency of a buck converter?

It is equal to VD × ID_AVG, where VD is the diode forward-drop. ID_AVG is the average current through the diode which is equal to IO × (1-D) for the buck converter. It is also frequency-independent. Qg is related to the effective input capacitance and gate drive voltage.

How do you find the current input?

The factors that determine input current are output power, input voltage, and converter efficiency. Power = Voltage x Current. Efficiency = Power Out / Power In. If you know the converter’s efficiency at the voltage and power it is operating at then calculating the input current is trivial.

How do you calculate the value of a buck-boost converter inductor?

When selecting an inductor for a buck converter the following parameters need to be defined:

  1. Maximum input voltage = Vin max.
  2. Minimum input voltage = Vin min.
  3. Maximum output current = Iout max.
  4. Operating frequency = f.
  5. Output voltage = Vout.
  6. Minimum output current = Iout min.

How do you solve impedance problems?

To calculate impedance, calculate the resistance and reactance of the circuit, then label resistance as R and reactance as X. Square both R and X, and add the two products together. Take the square root of the sum of the squares of R and X to get impedance. Display the answer in ohms.