The Boost circuit is a switching DC boost circuit that enables the output voltage to be higher than the input voltage. It is a relatively common circuit design method in electronic circuit design. This article is aimed at novices and will introduce you to the working principle of boost boost circuits.
First we need to know:
The capacitor hinders the voltage change, passes the high frequency, blocks the low frequency, communicates with the AC, and blocks the DC;
Inductance hinders current change, pass low frequency, block high frequency, pass DC, resist AC;
Figure 1 Schematic diagram of the boost switch boost circuit
Assuming that the switch (triode or MOS tube) has been disconnected for a long time, all components are in an ideal state and the capacitor voltage is equal to the input voltage.
The following is divided into two parts of charging and discharging to illustrate this circuit.
Charging process
figure 2
During the charging process, the switch is closed (the transistor is turned on), the equivalent circuit is shown in Figure 2, and the switch (triode) is replaced by a wire. At this time, the input voltage flows through the inductor. The diode prevents the capacitor from discharging to ground. Since the input is direct current, the current on the inductor increases linearly at a rate that is related to the inductor size. As the inductor current increases, some energy is stored in the inductor.
Discharge process
image 3
This is the equivalent circuit when the switch is turned off (triode cut-off) as shown in Figure 3. When the switch is turned off (triode cut-off), the current flowing through the inductor does not immediately become zero due to the current holding characteristic of the inductor, but slowly becomes zero when the charging is completed. The original circuit has been disconnected, so the inductor can only be discharged through the new circuit, that is, the inductor starts to charge the capacitor, and the voltage across the capacitor rises. At this time, the voltage is already higher than the input voltage. The boost is complete.
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