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Charging management circuit

A charging management circuit and circuit technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve the problems of unfavorable miniaturization application, increase system cost, etc., and achieve the effect of saving system cost and reducing area

Active Publication Date: 2012-09-26
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, the existing resistor R1 and transistor MN4 are additionally used, which increases the system cost. In addition, the resistor R1 and transistor MN4 also occupy additional PCB board area, which is not conducive to miniaturization applications.

Method used

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Embodiment Construction

[0041] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Furthermore, the order of elements in a method, flowchart, or functional block diagram representing one or more embodiments does not necessarily refer to any particular order nor constitute a limitation of the present invention.

[0042] The invention relates to a charging circuit, which can be used in mobile phones and mobile portable devices to charge the batteries of these devices. The following will take a charging circuit in a mobile phone as an example for illustration.

[0043] see figure 2 and image 3 As shown, it shows a schematic structural diagram of a deta...

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Abstract

The invention provides a charging management circuit comprising a switch control unit and a constant current charging circuit. The switch control unit controls the switching-on / off of two switches according to an input signal so as to control the input voltage of the constant current charging circuit or control the ratio of width to length of a transistor of a charging circuit so as to regulate the charging current of the constant current charging circuit. The invention can regulate the charging current as required and can be compatible with various control chips.

Description

【Technical field】 [0001] The invention relates to the field of electronic circuits, in particular to a charging management circuit with a current regulating function. 【Background technique】 [0002] Charge management chips are usually used to prolong the service life of lithium batteries and improve the safety of lithium batteries. Generally, there are three working modes for linear lithium battery charging management chips: pre-charging, constant current charging, and constant voltage charging. The pulse charging management chip has three working modes: pre-charging, constant current charging, and pulse charging. However, in some systems, it is necessary to dynamically change the constant current charging current value during the constant current charging process. For example, when the microprocessor control unit in the system detects that the system consumes too much power, in order to give priority to meeting the power supply needs of the system, it generally realizes i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
Inventor 王钊尹航
Owner WUXI ZGMICRO ELECTRONICS CO LTD