What is ripple in DC power supply?

Ripple (specifically ripple voltage) in electronics is the residual periodic variation of the DC voltage within a power supply which has been derived from an alternating current (AC) source. This ripple is due to incomplete suppression of the alternating waveform after rectification.

What is acceptable ripple voltage in a power supply?

about 100mV
Acceptable ripple voltage is about 100mV peak to peak. Majority of good power supplies have ripple and noise figures of better than 10mV rms, while SMPS figures of 50mV or less are possible, however, higher current supplies are likely to have slightly higher values.

What percent of ripple is generally acceptable?

A common practice is to allow the ripple to be 30\% of the peak value of the minimum allowed DC voltage on the S/C power bus.

How does ripple affect the power supply?

The ripple leads to power losses and overheating of components hence risk of damage in addition to inefficiency. It is therefore essential to remove or minimize the ripple in at the output. This is done using filter circuits which usually consist of a parallel capacitor or series inductor or both.

Why do we need ripple factor?

When the fluctuation occurs within the output of the rectifier then it is known as ripple. So this factor is essential to measure the rate of fluctuation within the resolved output. This capacitor helps to decrease the ripple within the rectifier output.

What causes ripple effects?

A ripple effect occurs when an initial disturbance to a system propagates outward to disturb an increasingly larger portion of the system, like ripples expanding across the water when an object is dropped into it.

What will happen to the output voltage ripple If the output capacitance is increased?

It does decrease the ripple on the output voltage (the ESR of the capacitor used also has an influence, and so do the switching frequency and the load). You can’t lower the set output voltage by using a larger capacitor on the output, if that is what you mean.

What is the ripple power for a high frequency generator?

Single-phase and two-phase generators have 100\% ripple. Three-phase generators have ripple values between 5 and 15\%. Modern X-ray generators use high-frequency inverters to create an approximate DC waveform, minimizing the ripple effect to less than 1\%.

Is PSU ripple bad?

While excessive voltage ripple is bad, some amount is perfectly normal and okay. All ATX power supplies have some amount of voltage ripple simply due to their design. Capacitors and other components are meant to withstand some voltage ripple, as it is a necessary evil for modern day PSUs.

What causes high ripple current?

Electronic circuits that operate at very high clock speeds have higher current requirements compared to those that operate at lower speeds. Circuits operating at such high speeds expose capacitors to large ripple currents, and very low ESR components are required to minimize power dissipation.