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Charging circuit of electron device with USB interface and method thereof

A technology of USB interface and electronic equipment, which is applied in the field of charging circuit, can solve problems such as inability to charge, cannot be charged normally, and has no installation, and achieves the effects of improving efficiency, easy method, and simple circuit structure

Active Publication Date: 2007-05-23
BEIJING ZHIGU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the USB protocol, the USB interface provides two currents of 100mA and 500mA. In some cases, the USB interface can only provide one of the currents for work, but there is no automatic charging current switching device installed in the existing equipment or parts, so it will cause the problem of not being able to charge normally
In addition, the above-mentioned electronic devices can only be charged through a computer or a charger, and if they are connected to other USB ports, such as a USB hub, they may not be able to be charged.

Method used

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  • Charging circuit of electron device with USB interface and method thereof
  • Charging circuit of electron device with USB interface and method thereof

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Embodiment Construction

[0015] The present invention has the circuit diagram of the charging circuit of the electronic equipment of USB interface as shown in Figure 1, comprises USB interface chip and USB charging chip, and the VCC terminal of USB interface chip J4 connects the power supply VBUS of USB interface, and signal terminal D- and D+ connect USB The signal line of the interface, the charger identification terminal CHG_IN is connected to the input terminal of a reverser, the input terminal of the reverser is connected to the positive pole V_BAT of the battery through a resistor R8, and the resistance of R8 is 1M; the output terminal of the reverser is connected to a The gate of the NMOS tube, the source of the NMOS tube is grounded, the drain is connected to the drain of another NMOS tube, the source of the other NMOS tube is grounded, and the gate is connected to the control terminal 500mA_Charge_SET of the CPU of the small electronic device and a resistor R151, the resistance value of R151 i...

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Abstract

The invention relates to a charge circuit with USB interface, wherein it uses the pin connected to USB interface chip to switch NMOS tube, to generate different feedbacks of two resistances that connected to the charge chip, to switch different charge currents on USB interface. The invention also discloses relative charge method, which inquires USB protocol and detect USB interface, to switch difference charge currents. The invention can charge device via USB interface anywhere, to automatically switch 100mA and 500mA currents.

Description

technical field [0001] The invention relates to a charging circuit, in particular to a charging circuit for electronic equipment with a USB interface; the invention also relates to a charging method for the electronic equipment with a USB interface. Background technique [0002] Now, the USB interface is widely used in various handheld electronic devices. When these devices are connected to the computer, a connecting line is used. One end of the connecting line is a USB interface, which is connected to the USB interface of the computer, and the other end is It is a MINI USB interface, and this end is connected with a handheld electronic device. For the convenience of use, these electronic devices are generally designed to be charged with the MINI USB interface, and are equipped with a dedicated charger corresponding to the interface. Among these devices, some also have the function of being directly connected to a computer and charging through the computer. However, accord...

Claims

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Application Information

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IPC IPC(8): H02J7/02H01M10/44
CPCY02E60/12Y02E60/10
Inventor 夏涛何代水
Owner BEIJING ZHIGU TECH SERVICE
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