Ch1-2 Ratification and voltage regulator

Left graph depicts a bridge rectifier circuit, whose function is to convert alternating current (AC) from the mains power supply into direct current (DC). When the AC input is in its positive half-cycle, terminal 1 of the input becomes positive (+) while terminal 2 becomes negative (-). The current flows through diode D1, the load, and diode D3 (following the blue path), exiting from terminal 2. Conversely, during the negative half-cycle of the AC input, terminal 1 becomes negative (-) and terminal 2 becomes positive (+). The current then flows through diode D2, the load, and diode D4 (following the green path), exiting from terminal 1.

As we can observe in middle graph, the current direction at the DC output remains consistent and is always positive.

When a capacitor is added to the output, a ripple (represented by the brown portion) is formed in the current waveform. Although the ripple does not completely disappear, its amplitude is significantly reduced. The larger the capacitance value and the smaller the load current, the smoother the output waveform (brown path) becomes.

At left graph, Let’s? recalling the circuit theory we've learned, can we construct a voltage regulator using a simple voltage divider circuit? And considering a scenario where the load current continuously increases, meaning RL becomes relatively smaller, will the output voltage remain stable? The answer is likely negative. Therefore, designing a power management IC chip that meets specific usage requirements is a crucial task today."