Switching type capacitance conversion circuit and switching conversion unit therein

Abstract

The invention relates to a switching type capacitance conversion circuit and a switching conversion unit in the switching type capacitance conversion circuit. The switching type capacitance conversion circuit comprises a plurality of capacitors and a plurality of switches, the plurality of switches are used for periodically switching the plurality of capacitors based on a switching period, in a first time period, the plurality of switches control the first capacitor to be electrically connected between the first power supply and the second power supply, and in a second time period, the plurality of switches control the second capacitor to be electrically connected between the first power supply and the second power supply. The second capacitor and the third capacitor are connected in series and are electrically connected between a second power supply and a ground potential; in a second time period, the plurality of switches control the first capacitor and the second capacitor to be connected in series and electrically connected between the second power supply and the ground potential, and control the third capacitor and the second power supply to be connected in parallel and electrically connected; therefore, the ratio of a second current of the second power supply to a first current of the first power supply is 4.

Description

technical field [0001] The invention relates to a switched capacitance conversion circuit, in particular to a switched capacitance conversion circuit that can select different conversion ratios. The invention also relates to a switching conversion unit for a switched capacitance conversion circuit. Background technique [0002] figure 1 A charging system 1000 of the prior art is shown, wherein the N-fold switched capacitor converter 100 is used to perform a first power supply (corresponding to a first voltage V1 and a first power source) by switching through at least one capacitor (eg, capacitor CFLY). For the conversion between the current I1) and the second power source (corresponding to the second voltage V2 and the second current I2), the N-fold switched capacitor converter 100 can set the multiple between the first voltage V1 and the second voltage V2 N, N is, for example, the ratio of the first voltage V1 to the second voltage V2, and also the ratio of the second cur...

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Problems solved by technology

[0005] image 3 The disadvantage of the switched capacitor converter 300 in the prior art is that, due to the high voltage conversion ratio, the switches Q21-Q28 in the switching conversion unit 131 must all be high voltage resistant switches.

From another point of view, for the switching conversion units 131 and 132, the switches that need to withstand high voltage account for 1 / 2 of the total number of switches (Q21~Q28, Q31~Q38), so the cost cannot be reduced

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