Single-inductor multi-output power converter and control method thereof

Abstract

The invention relates to a single-inductor multi-output power converter which is characterized by comprising an inductor, a first switch, a second switch, a third switch and a fourth switch, wherein the inductor is provided with a first end and a second end, the first end of the inductor is connected with the input end of the power converter; the first switch is connected between the first end and the second end of the inductor; the second switch is connected between the second end of the inductor and an earth terminal, the third switch is connected between the second end of the inductor and the first output end of the power converter; and the fourth switch is connected between the second end of the inductor and the second output end of the power converter. The single-inductor multi-output power converter and a control method thereof have the advantages of reducing the conduction loss, the switching loss and the gate drive loss and improving the efficiency of the power converter.

Description

technical field [0001] The present invention relates to a power converter, in particular to a single inductor multiple output (Single Inductor Multiple Output; SIMO) power converter and a control method thereof. Background technique [0002] With the advancement of technology, electronic products have more and more functions. Therefore, in some electronic products, a single power supply can no longer meet the needs, so the power converter is also developing towards the direction of providing multiple power supplies. figure 1 A known single inductor dual output (Single Inductor Dual Output; SIDO) power converter 10 is shown. The power converter 10 can provide two sets of power supplies. The power converter 10 includes a switch SW1 connected to the input terminal 12 of the power converter and Between the inductor L, the switch SW2 is connected between the inductor L and the ground terminal GND, the switch SW3 is connected between the inductor L and the ground terminal GND, the...

AI Technical Summary

Problems solved by technology

[0004] like figure 1 As shown, the traditional SIDO power converter 10 needs five switches SW1, SW2, SW3, SW4 and SW5 to generate two sets of voltages VOA and VOB, and the energy transmitted on each energy path P1, P2, P3, P4 and P5 Energy has to pass through two switches, so there is a large conduction loss (conduction loss). In addition, each switch must be equipped with a driver, so the switching loss generated by the switch and the driver and the gate drive loss (gate drive loss) can not be ignored

[0005] Therefore there is above-mentioned inconvenience and problem in known power converter

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