Multi-mode switching circuit and control method thereof

Abstract

The invention discloses a multi-mode switching circuit which comprises an inductor, a first transistor, a second transistor and a third transistor. The inductor is coupled between the input end and the switching end. The first transistor is coupled between the switching end and the grounded end. The second transistor and the third transistor are coupled between the switching end and the output end in series. When a voltage converter is not enabled, the second transistor and the third transistor of the multi-mode switching circuit can effectively isolate input voltage from output voltage. After the voltage converter is enabled, the voltage converter can work in a voltage increasing mode and a voltage decreasing mode so that the output voltage with the larger range can be provided.

Description

technical field

[0001] Embodiments of the present invention relate to electronic circuits, and more specifically but not exclusively to a switch-type multi-mode conversion circuit and a control method thereof. Background technique

[0002] A switching converter circuit is a commonly used voltage conversion circuit generally configured to provide a regulated output voltage or current ("load voltage" or "load current") to a load based on some unregulated source voltage.

[0003] figure 1 A schematic circuit diagram of an existing boost conversion circuit 10 is shown. The switch conversion circuit 100 includes a first inductor L1, a first transistor M1, a second transistor M2 and an output capacitor CO. The first inductor L1 is coupled between the input terminal IN and the switch terminal SW, the first transistor M1 is coupled between the ground terminal GND and the switch terminal SW, and the second transistor M2 is coupled between the switch terminal SW and the output termi...

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