What is crossover frequency in power supply?

The first point of interest is the crossover frequency (fc). This is the frequency at which the control loop gain is unity (0 dB) and is also referred to as the loop bandwidth (approximately 7 kHz for this example).

What is regulator bandwidth?

The higher the bandwidth of a regulator, the more quickly it can react to changes in input and power supply and keep the output voltage constant. High bandwidth also improves the power supply rejection ratio (PSRR) of the regulator, which is a measure of how well the regulator attenuates noise on the power supply.

What is phase margin in switching PSU?

The phase margin is the amount of extra open loop gain phase shift at the unity gain crossover needed to make the closed loop system unstable. It is the difference in phase between 360 or 0 degrees phase shift and the measured phase at the unity gain crossover.

How does the switching frequency of the switch affect to the output voltage ripple?

With the higher switching frequency set, the engineer can choose a smaller filter inductor and less output capacitor. Besides, a higher switching frequency is helpful for the voltage ripple of input side, so the input capacitor can also be reduced.

How would the input frequency affect the ripple height?

Assuming there is a sizable filter capacitor attached to the rectifier, the input frequency increases the interval between peaks decreases and the ripple amplitude reduces as the droop between peaks is reduced.

Which determines the switching frequency of the circuit?

The switching frequency of a PWM converter for a motor drive is determined on the basis of total loss minimization of the converter and motor. The converter loss has two components: switching loss and conduction loss. The switching loss increases with frequency.

What is switching frequency of boost converter?

Why are switching frequencies for boost converters above the 100kHz range? A powerful boost converter could operate in the low/medium kHz range and might do so because the power transistors used are inherently slow devices. The trick is to operate at a frequency where static losses approximately equal dynamic losses.

What is the crossover frequency of a switch?

Edit: In non mathematical terms, the crossover frequency can be likened to the bandwidth of the control system. The reason the crossover frequency should be less than 1/8th of the switching frequency is to avoid switching noise and ripple interfering with the controller.

What is a good crossover frequency for load response?

Higher the crossover frequency (i.e frequency at which loop gain = 1) faster the load response, But this should also be low enough to accommodate attenuation of switching noise. In my opinion 1/8 is not a rigid number to go by, it is usually anything between 1/10 and 1/5 of the switching frequency.

How much switching frequency needed to close a loop?

Practically the phase and transport lag there make it impossible to close the loop there, so 1/5 to 1/10th the switching frequency is a good rule of thumb. Could some one tell me what does the words in blockquote mean when it says , “there make it impossible to close the loop there”?

What is the maximum bandwidth of a switch mode power supply?

A switch mode power supply is essentially a sampled-data system, therefore the theoretical maximum bandwidth is one half the switching frequency. Practically the phase and transport lag there make it impossible to close the loop there, so 1/5 to 1/10th the switching frequency is a good rule of thumb.