Charging circuit and capacitanc power switching circuit thereof

Abstract

The utility model provides a be used for providing a charging current's charging circuit to a battery, contains a power transmitting element and a capacitanc power switching circuit. This power transmitting element is a direct current output current and adjusts this direct current output current accurate in a predetermined output current position with an input power switching over, this capacitancpower switching circuit includes a change over switch circuit that has a plurality of change over switch, its with one or a plurality of changeover condenser be coupled, an and conversion control circuit, for in a plurality of conversion period, correspond these a plurality of change over switch of operation, make this one or a plurality of changeover condenser periodically correspond and be coupled in one or a plurality of partial pressure node, this direct current output voltage, and between this ground point a pair of node wherein, and via this one or a plurality of partial pressure node in a node produce this charging current, wherein this charging current's position standard roughly is the flow increasing multiple of the accurate acquiescence in this predetermined output current position. The utility model discloses still provide to be used for charging circuit's capacitanc power switching circuit.

Description

technical field [0001] The invention relates to a charging circuit, in particular to a charging circuit capable of multiplying current and charging with constant voltage. The invention also relates to a capacitive power conversion circuit and a charging control method used in the charging circuit. Background technique [0002] figure 1 A prior art charging circuit (charging circuit 1) is disclosed, which includes a power adapter (adaptor) 11 with direct charging capability, which can provide DC current IDC directly through a cable 20 (such as a USB cable) and a load The switch 40 (load switch) charges a battery 50 with a constant current (CC, constant current), wherein the DC current IDC is substantially equal to the charging current ICHG. However figure 1 With the prior art shown in , when using a standard cable such as a USB cable, the current limit of the cable is generally relatively low, such as about 5A or less, and the charging time is thus longer. If you want to ...

AI Technical Summary

Problems solved by technology

figure 2 The disadvantage of the prior art shown in is that, especially under the requirement of a relatively large constant charging current ICHG, in the switching charging circuit 60, it is difficult to select an inductor and a switch (not shown) with proper specifications to balance the charging current. , current ripple amplitude, switch on-resistance, energy conversion efficiency and other parameters optimization, resulting in design optimization is not easy to achieve

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