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Charging current control circuit, charging current control method, electronic equipment and charging method thereof

A charging current and control circuit technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve the problem that the high-current charging current and high-precision targets cannot be taken into account, and achieve the effect of improving sampling accuracy and high-precision control

Inactive Publication Date: 2020-07-28
无锡艾为集成电路技术有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the wide range of charging current, in the same current control circuit, it often happens that the high-precision targets of low-current charging current and high-current charging current cannot be balanced

Method used

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  • Charging current control circuit, charging current control method, electronic equipment and charging method thereof
  • Charging current control circuit, charging current control method, electronic equipment and charging method thereof
  • Charging current control circuit, charging current control method, electronic equipment and charging method thereof

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Embodiment Construction

[0035]As mentioned in the background art, the inventors have found through analysis that, in the prior art, it is difficult to balance the control accuracy of large current and small current at the same time. In the existing charging current control circuit, the charging current is output through the power transistor, and the sampling transistor is used to sample the current of the power transistor to obtain the sampling current. Because the power tube needs to support a large current, its size will usually be larger. In the case of a small charging current, due to the larger size of the power tube, the grid voltage of the power tube will be adjusted to a small value by the charging loop to improve the power tube. If the gate voltage is too small, the power tube will easily enter the sub-threshold stage. At this time, the accuracy of the current sampling performed by the sampling tube will be greatly reduced, resulting in a large error in the charging current, making it impossi...

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PUM

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Abstract

The invention discloses a charging current control circuit, a charging current control method, electronic equipment and a charging method thereof. The charging current control circuit comprises a charging current output module, a sampling module, a reference generation module, an error amplification module and a control module, wherein the charging current output module is used for outputting a charging current and outputting a sampling current obtained by sampling the charging current according to a sampling proportion; the sampling module is connected with the charging current output moduleand is used for acquiring a sampling voltage according to the sampling current; the reference generation module is used for generating a reference voltage; the error amplification module is connectedwith the sampling module and the reference generation module, and is used for carrying out error amplification on the sampling voltage and the reference voltage, outputting an error amplification signal to the charging current output module and controlling the charging current; and the control module is used for outputting a corresponding sampling control signal to the charging current output module according to the charging mode signal and adjusting the sampling proportion.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a charging current control circuit. Background technique [0002] As a green new energy, lithium batteries have been more and more widely used in various electronic products in life. With the popularity of digital products such as mobile phones and laptops, lithium-ion batteries have been widely used in such products with excellent performance, and are gradually developing into other product applications, such as portable electronic devices, wearable devices and IoT (Internet of Things, Internet of Things) devices, etc. In these lithium battery-powered systems, due to the different sizes and space areas of the system, applications with different lithium battery capacities are derived. For example, TWS (True Wireless Stereo, true wireless stereo) earphones have lithium batteries ranging from 30mAh to 100mAh Capacity applications, there are also lithium battery capaci...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 宋志军吴传奎李响曹雷孟威威
Owner 无锡艾为集成电路技术有限公司
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