How does the output resistance and ripple factor affect the regulated power supply
The smaller the load, the greater the output current may make the power overload protection, the ripple on the power supply system and feedback have an impact
When the load changes (from no load to full load), the output voltage Usc should remain essentially unchanged. The performance of the regulated power supply can be characterized by output resistance.
The output resistance (also called equivalent resistance) is denoted by rn, which is equal to the ratio of the output voltage change and the load current change. Rn reflects the load changes, the output voltage to maintain a constant ability, rn smaller, then Ifz change the output voltage changes are smaller. Excellent performance of the power supply, the output resistance can be as small as 1 euro, or even 0.01 oh.
The so-called ripple voltage, refers to the output voltage of 50 Hz or 100 Hz AC component, usually expressed with a rms or peak. After the regulator, can make the rectified filter after the ripple voltage greatly reduced, the inverse of the inverse ratio of the regulator S.
When the load changes (from no load to full load), the output voltage Usc should remain essentially unchanged. The performance of the regulated power supply can be characterized by output resistance.
The output resistance (also called equivalent resistance) is denoted by rn, which is equal to the ratio of the output voltage change and the load current change. Rn reflects the load when the output voltage to maintain a constant ability, rn smaller, then Ifz change the output voltage changes are smaller. Excellent performance of the power supply, the output resistance can be as small as 1 euro, or even 0.01 oh.
The so-called ripple voltage, refers to the output voltage of 50 Hz or 100 Hz AC component, usually expressed with a rms or peak. After the regulator, can make the rectified filter after the ripple voltage greatly reduced, the inverse of the inverse ratio of the regulator S.
Through the discussion of the regulator coefficient SR and the output resistance RO, it can be seen that in order to improve the regulator performance of the regulated power supply, the following measures should be taken:
????(1) to improve the magnification of the magnification level. To this end should increase the T2 load resistance R4, the appropriate increase in the T2 of the static operating point in order to reduce its input resistance Rbe2;
????(2) In order to improve the β value of the adjustment tube, two or even three transistors can be used to form the composite pipe;
????(3) In order to improve the sampling voltage ratio n, should be appropriate to improve the reference voltage, it should use a higher regulator, the output resistance is small, the temperature coefficient of small regulator.
