The use of switched-mode voltage regulators has increased considerably in recent years in parallel with technological developments. Several different types of switching regulators are designed. In this chapter; The general characteristics of the type of inverting or buck-boost used in the design of the switched-mode voltage regulators will be examined and the basic logic will be explained.
When the input is positive, the output is negative. The value of the output voltage may be equal to or less than the regulated input voltage. The value of the output voltage is determined by the control environment. A simple circuit for a typical directional switching regulator circuit is given in figure 2.6.
In order to understand how the dynamics work; let’s consider the output voltage V0 <0 and the switch S switch closed. In this case, the diode is a diode cut because the cathode is positive and the anode is negative. C capacitor RL is discharged through the load resistor, the inductor current increases with respect to VIN · tON / L.
When the switch is turned on, the LED will not change immediately and the diode will be forced to ON, then L, C and D will flow around the capacitor C to charge the bottom of the capacitor positive and the top capacitor to the negative. So the output of the mission will be negative polarity. In such a regulator, the output voltage V0 can be formulated as follows.