Adaptive input current limitation charger and control method thereof

Abstract

Disclosed are an adaptive input current limitation charger and a control method thereof. The charger comprises a power converter and a current feedback loop. The power converter acquires input current from the external power supply and supplies output current for load as the charging current; the current feedback loop is used for comparing a first detection signal of the representation input current with a first current reference signal to produce a first error signal and providing the first error signal to the power converter so as to allow the power converter to adjust the input current according to the first error signal; the current feedback loop judges the overload state of the external power supply according to the input voltage of the power converter, when the external power supply overloads, the charger is in a current limited state, and the current feedback loop reduces the first current reference signal gradually until the external power supply recovers into the non-overloaded state. By the aid of the charger, the charging speed can be increased, and the overload of the external power supply can be avoided.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a charger with adaptive input current limitation and a control method thereof. Background technique [0002] Switching chargers have the advantages of small size, high efficiency, and fast charging of batteries, and are widely used in smart phones, tablet computers and other fields. However, external power sources such as adapters and USB ports of computer equipment often have certain output power and output current limitations. During battery charging, an external power source is used to power the switching charger. In order to prevent the adapter or USB power supply from being overloaded, it is necessary to limit the input current of the charger. [0003] figure 1 A schematic circuit diagram showing an example of a charger with adaptive input current limitation according to the prior art. The charger includes a power converter 100 for converting an input voltage Vin into an ou...

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Problems solved by technology

[0006] exist figure 2 In the switching charger shown, although the output current capability of the external power supply can be maximized, the external power supply (such as an adapter, etc.) in the previous stage will still be overloaded for a long time, and the heat will be too high, which will affect the life.

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