Voltage rise and fall circuit

The working principle and process are as follows:

(1) When the controllable switch V is in the on state, the power supply e supplies power to the inductance L through the controllable switch V and stores the energy in the inductance. At this time, the current flowing out of the power supply e is I1, and the direction is shown in Fig. 4. At this time, capacitor C should not only keep the output voltage constant, but also supply power to load R.

(2) When the controllable switch V is in the off state, the power supply e is disconnected and the energy stored in the inductor L supplies power to the capacitor C and the load R. at this time, the current flowing out of the inductor is I2, and the direction of the inductor current cannot change suddenly, as shown in Fig. 4. The current I2 flows through the load r from bottom to top, so the voltage polarity of the load R is opposite to that of the power supply E. therefore, the voltage rise and fall chopper circuit is often referred to as the reverse polarity chopper circuit. Cuk chopper circuit

The working principle and process are as follows:

(1) When the controllable switch V is in the on state, as shown in Fig. 5, the Cuk chopper circuit can be divided into two circuits: the power supply E and the inductance L1 form a circuit through V; Load R, inductance L2 and capacitance C form a loop through V and flow current respectively.

(2) When the controllable switch V is in the off state, the Cuk chopper circuit is divided into two circuits: power supply e, inductance L1 and capacitance C form a circuit through diode VD; Load R and inductance L2 form a loop through VD and flow current respectively.  As shown in Fig. 5 (b), the current I2 flows through the load r from bottom to top, so the voltage polarity of the load R is opposite to that of the power supply E.