CN204407944U - The Function detection circuit of tool intelligence USB identification chip - Google Patents

Abstract

A function detection circuit with an intelligent USB identification chip includes a mobile device, a voltage detection circuit and a power supply circuit connected to the mobile device, a connection between the voltage detection circuit and the power supply circuit can detect the voltage of the load device, and A USB charging control circuit that optimizes its charging current. The utility model solves the defects of insufficient compatibility of the traditional mobile charging power supply, too small charging current and the like. By installing a USB charging control chip between the power supply and the USB controller, the mobile charging power supply has the ability to detect the voltage of the load device and optimize its charging current. The utility model also has the characteristics of easy implementation and low cost.

Description

Function detection circuit with intelligent USB identification chip

【Technical field】

The utility model relates to a mobile device, in particular to a function detection circuit of a USB identification chip capable of rapidly charging the mobile device.

【Background technique】

With the development of mobile networks and the reduction of Internet access costs, people's entertainment methods have changed. People can use mobile networks for communication or entertainment anytime and anywhere through mobile devices, such as tablet computers and mobile phones. However, with the continuous enhancement of the functions and energy consumption of mobile devices, the development of battery technology for providing electric energy is relatively lagging behind. In this case, it is very necessary to equip mobile devices with portable and ready-to-charge mobile power sources. Usually, the bias voltage D+ and D- of the USB charging port of the mobile power supply are divided into 2.7V and 2.0V by resistors. This setting can only solve the charging problem of Apple's mobile devices and some other brands of smartphones. But this setup doesn't charge Samsung's tablets and some BlackBerry phones. In addition, there are currently three charging modes on the market: Apple 10W charging mode, Samsung 10W charging mode and USB BC1.2DCP charging mode. If the USB port only uses resistor voltage divider as one of the charging modes, it can only support part of the mobile device charging, which has certain limitations in compatibility. At the same time, many mobile devices do not support fast charging technology, and the charging current can only reach 500mA, so the market urgently needs a technology that can charge mobile devices quickly and optimize the charging current of mobile devices.

【Content of invention】

The utility model aims at solving the above problems, and provides a function detection circuit with an intelligent USB identification chip which can optimize the charging current of the mobile device and has strong compatibility.

In order to achieve the above object, the utility model provides a function detection circuit with an intelligent USB identification chip, including a mobile device and a voltage detection circuit and a power supply circuit connected to the mobile device. It is characterized in that the voltage detection circuit and the power supply circuit A USB charging control circuit that can detect the voltage of the load device and optimize its charging current is connected between them.

The voltage detection circuit includes resistors R2, R3 and voltages D+, D-, VBUS, wherein the input ends of the resistors R2, R3 are respectively electrically connected to the USB charging control circuit and the power supply circuit, and the output ends of the resistors R2, R3 are connected via The voltages VBUS, D+, D-, and the grounding tube GND are electrically connected to the mobile device.

The USB charging control circuit includes a USB controller, a USB charging control chip, a resistor R1, bias voltages D+, D-, and a neutral line GND, wherein the input terminals of the USB controller pass through the bias voltages D+, D- -, the resistor R1 and the grounding tube GND are electrically connected to the USB charging control chip and the power supply circuit, and the output terminal of the USB controller is electrically connected to the voltage detection circuit and the mobile device.

The USB data pipe corners DM and DP of the USB charging control chip are electrically connected to the bias voltages D- and D+ of the voltage detection circuit through the USB controller through the bias voltage D- and D+ respectively, and the power pipe corners of the USB charging control chip VCC is connected in parallel with the power supply circuit and the USB controller respectively, and the ground tube corner GND of the USB charging control chip is connected in parallel with the power supply circuit, the voltage detection circuit and the ground tube corner GND of the mobile device respectively.

The power supply circuit includes a 5V power supply and a grounding tube angle GND, wherein the 5V power supply is connected to the power supply tube angle VCC and the USB controller of the USB charging control circuit respectively, and the grounding tube angle GND is connected to the USB charging control circuit and the mobile device respectively. The ground pipe angle GND is connected in parallel.

The USB charging control chip is an SMH USB charging control chip.

When the voltage VBUS=5.0V, the charging current of the mobile device can be optimized.

The contribution of the utility model is that the utility model solves the defects of insufficient compatibility of the traditional mobile charging power source, too small charging current and the like. By providing a USB charging control chip between the power supply and the USB controller, the USB charging control chip can detect the voltage of the load device and optimize its charging current. The utility model also has the characteristics of easy implementation and low cost.

【Description of drawings】

Fig. 1 is a schematic diagram of the circuit structure of the utility model.

【Detailed ways】

The following examples are further explanations and supplements to the utility model, and do not constitute any limitation to the utility model.

As shown in FIG. 1 , the function detection circuit with an intelligent USB identification chip of the present invention includes a mobile device 10 , a voltage detection circuit 20 , a power supply circuit 30 and a USB charging control circuit 40 .

In this embodiment, the mobile device 10 is respectively connected to the USB charging control circuit 40 and the power supply circuit 30 through the voltage detection circuit 20 .

As shown in Figure 1, the voltage detection circuit includes resistors R2, R3, D+, D- bias voltage and VBUS voltage. Wherein, the input terminals of the resistors R2 and R3 are electrically connected to the USB charging control circuit and the power circuit respectively, and the output terminals of the resistors R2 and R3 are electrically connected to the mobile device through the voltages VBUS, D+, D-, and the grounding tube GND. Usually the USB charging current depends on two conditions: VBUS voltage and D+/D- bias voltage. The magnitude of the VBUS voltage will directly affect the magnitude of the charging current of the mobile device. In this embodiment, the VBUS=5.0V voltage can optimize the charging current of the mobile device. Because the mobile device first checks the VBUS voltage to determine the size of the current that needs to be charged to the mobile device. At the same time, it is also necessary to consider the influence of the resistor R1 in the USB charging control circuit 40 and the resistor R2 in the voltage detection circuit 20 on the magnitude of the current. The smaller the resistors R1 and R2, the greater the VBUS voltage, resulting in excessive output current; The larger R1 and R2 are, the smaller the VBUS voltage will be, resulting in too small output current. Therefore, the best value is only when the VBUS voltage is 5.0V, the charging current is about 1.6A, and the output current capacity of the mobile power supply is 2.1A.

As shown in FIG. 1 , the USB charging control circuit 40 is disposed between the voltage detection circuit 20 and the power supply circuit 30 , which can detect the voltage of the load device and optimize its charging current. The USB charging control circuit 40 includes a USB controller 41 , a USB charging control chip 42 , a resistor R1 , bias voltages D+, D−, and a ground pin GND. Wherein, the USB charging control chip 42 is fixed in the USB controller 41 . The USB charging control chip is an SMH USB charging control chip, more specifically a UC2631 or UC2632 charging identification chip. The USB controller 41 is any known USB controller. The input terminals of the USB controller 41 are electrically connected to the USB charging control chip 42 and the power supply circuit 30 through the bias voltage D+, D-, the resistor R1 and the grounding tube angle GND respectively, and the output terminals of the USB controller 41 are connected to the voltage detection The circuit 20 is electrically connected to the mobile device 10 . The USB data pipe corners DM and DP of the USB charging control chip 42 are electrically connected to the bias voltages D- and D+ of the voltage detection circuit 20 through the USB controller 41 through the bias voltage D- and D+ respectively, and the USB charging control chip 42 The power supply tube angle VCC of the power supply circuit and the USB controller 41 are respectively connected in parallel, and the ground tube angle GND of the USB charging control chip is respectively connected in parallel with the power supply circuit 30, the voltage detection circuit 20 and the ground tube angle GND of the mobile device 10. . In this embodiment, the USB charging control chip 42 only solves the bias voltages of D+ and D-. The magnitude of the VBUS voltage directly affects the charging current of the mobile device 10 . The larger the VBUS voltage, the larger the output current, and the smaller the VBUS voltage, the smaller the output current.

As shown in Figure 1, the power supply circuit includes a power tube corner 5V and a ground tube corner GND. Wherein, the power supply can be any known mobile power supply. The power tube corner 5V is connected to the power tube corner VCC of the USB charging control circuit and the USB controller respectively, and the ground tube corner GND is connected in parallel with the USB charging control circuit and the ground tube corner GND of the mobile device respectively.

Although the utility model has been disclosed through the above embodiments, the scope of the utility model is not limited thereto. Under the condition of not departing from the concept of the utility model, the above components can be realized by similar or equivalent elements understood by those skilled in the art replace.

Claims (7)

1. A function detection circuit with an intelligent USB identification chip, comprising a mobile device and a voltage detection circuit and a power supply circuit connected with the mobile device, it is characterized in that, an adjustable load is connected between the voltage detection circuit and the power supply circuit The USB charging control circuit that optimizes the charging current of the device. 2. The function detection circuit of tool intelligent USB identification chip as claimed in claim 1, is characterized in that, described voltage detection circuit comprises resistance R2, R3 and voltage D+, D-, VBUS, wherein, described resistance R2, R3 The input terminals of the resistors are electrically connected to the USB charging control circuit and the power supply circuit respectively, and the output terminals of the resistors R2 and R3 are electrically connected to the mobile device through the voltages VBUS, D+, D-, and the grounding tube GND. 3. The function detection circuit with an intelligent USB identification chip as claimed in claim 2, wherein the USB charging control circuit comprises a USB controller, a USB charging control chip, a resistor R1, bias voltages D+, D-, and the zero line GND, wherein the USB charging control chip is set in the USB controller, and the input terminals of the USB controller respectively pass the bias voltage D+, D-, the resistance R1 and the grounding tube angle GND and the USB charging control chip It is electrically connected with the power supply circuit, and the output end of the USB controller is electrically connected with the voltage detection circuit and the mobile device. 4. The function detection circuit of tool intelligent USB identification chip as claimed in claim 3, it is characterized in that, the USB data tube angle DM, DP of described USB charging control chip passes bias voltage D-, D+ respectively through USB controller It is electrically connected with the bias voltage D- and D+ of the voltage detection circuit, the power supply tube angle VCC of the USB charging control chip is connected in parallel with the power supply circuit and the USB controller respectively, and the grounding tube angle GND of the USB charging control chip is respectively connected to the power supply circuit , the voltage detection circuit and the grounding pipe angle GND of the mobile device are connected in parallel. 5. The function detection circuit of tool intelligent USB identification chip as claimed in claim 4, it is characterized in that, described power supply circuit comprises power supply tube angle 5V and grounding tube angle GND, wherein, described power supply tube angle 5V is connected with USB charging respectively The power tube corner VCC of the control circuit is connected to the USB controller, and the ground tube corner GND is connected in parallel with the ground tube corner GND of the USB charging control circuit and the mobile device, respectively. 6. The function detection circuit of tool intelligent USB identification chip as claimed in claim 4, is characterized in that, described USB charging control chip is SMH USB charging control chip. 7. The function detection circuit with an intelligent USB identification chip as claimed in claim 4, wherein the charging current of the mobile device can be optimized when the voltage VBUS=5.0V.