WO2019206317A1

WO2019206317A1 - Charging device, usb cable and charging system

Info

Publication number: WO2019206317A1
Application number: PCT/CN2019/084708
Authority: WO
Inventors: 雷晓鹏; 王永超
Original assignee: 华为技术有限公司
Priority date: 2018-04-28
Filing date: 2019-04-28
Publication date: 2019-10-31
Also published as: CN110417069B; CN110417069A

Abstract

Provided are a charging device, a USB cable and a charging system. The charging device comprises: a detection circuit, a universal serial bus (USB) interface and a processor, wherein the USB interface is used for connecting to a USB cable, a circuit of a signal channel of the USB cable comprises a first resistor, and a resistance value of the first resistor is used for identifying the attribute of the USB cable; the detection circuit is used for detecting the first resistor, and reporting a detection result to the processor, a first end of the detection circuit is connected to the first resistor by means of the USB interface, and a second end of the detection circuit is connected to a power source of the charging device, and the processor is used for determining the resistance value of the first resistor according to the detection result of the first resistor, and for determining the attribute of the USB cable according to the resistance value of the first resistor. According to the charging device provided in the present application, the attribute of a USB cable is determined by means of detecting a resistance value of a first resistor in the USB cable, thereby improving safety when charging a terminal device with the USB cable.

Description

Charging device and USB cable and charging system

Technical field

The application relates to the field of circuits, and in particular to charging devices and USB cables and charging systems in the field of circuits.

Background technique

With the rapid development of the terminal product market and consumer products in recent years, the battery capacity of the terminal products is getting larger and larger, and the charging current is also increasing. This has caused more and more market users to reflect security issues such as burnt phone and cable burnout. A large part of the reason is that the Universal Serial Bus (USB) cable used by the user is caused by non-standard cables whose quality cannot be guaranteed or whose specifications do not meet the charging requirements, which may cause serious damage to the user and property. damage. At present, the high-end markets in Japan and Europe and the United States are very strict on the safety of such electrical appliances. Some countries have clear legal requirements. If the fault reaches a certain level, they will face all recalls and severe penalties for the products. Therefore, it will become more and more urgent to solve such charging safety problems. .

At present, USB cable identification is defined in the USB Type C (TYPE-C) protocol, which defines an Electrically Marked Cable (E-Marker) to identify the cable. The solution is to package a chip to USB. Inside the cable, by identifying the identity (ID) information in the chip, the USB Type-C active cable, the Downstream Facing Port (DFP) and the uplink port (the Downstream Facing Port, DFP) and the uplink port (with the E-Marker chip) are identified. The Upstream Facing Port (UFP) can read the attributes of the USB cable by using a power delivery (PD) protocol. For example, the USB cable can be obtained with power transmission capability, data transmission capability, ID, and the like. Therefore, the charging current can be adjusted according to the properties of the USB cable, thereby avoiding safety problems such as burning of the USB cable and burning of the cable.

However, the method of using a packaged chip to identify a USB cable in a USB cable is costly to manufacture, and it is difficult to mass-produce. Therefore, how to ensure the security of the user when using the USB cable becomes an urgent problem to be solved.

Summary of the invention

The application provides a charging device and a USB cable and a charging system. The attribute of the USB cable can be determined by detecting the resistance of the first resistor in the USB cable. Therefore, the performance of the USB cable can be determined, the security of charging the terminal device by using the USB cable can be improved, and the safety during charging of the user can be improved.

In a first aspect, a charging device is provided, including a detecting circuit, a universal serial bus USB interface, and a processor, wherein the USB interface is used for connecting a USB cable, and the circuit of the signal channel of the USB cable includes the first a resistor, the resistance of the first resistor is used to identify an attribute of the USB cable; the detecting circuit is configured to detect the first resistor, and report the detection result to the processor, where the first end of the detecting circuit passes the USB An interface is connected to the first resistor, a second end of the detecting circuit is connected to a power source of the charging device, and the detecting circuit acquires a detecting voltage from the power source; the processor is configured to: acquire a detection result of the detecting circuit; The detection result of the resistance determines the resistance of the first resistor; and determines the attribute of the USB cable according to the resistance of the first resistor.

In the charging device provided by the first aspect, the resistance of the first resistor in the USB cable can be detected by the detecting circuit to determine the attribute of the USB cable. In order to improve the security of the USB cable when the terminal device is subsequently charged by the USB cable, the security of the user is improved.

In a possible implementation manner of the first aspect, the processor is further configured to: according to an attribute of the USB cable, control a magnitude of an output current of the charging device to the USB cable.

In a possible implementation manner of the first aspect, the detecting circuit includes an analog-to-digital converter ADC and a second resistor, and two ends of the second resistor are respectively connected to the power source and the first resistor, and the ADC is connected to the A circuit between the second resistor and the first resistor is configured to collect a voltage across the first resistor, and the processor obtains a detection result, and the detection result is a voltage collected by the ADC.

In a possible implementation manner of the first aspect, the processor is configured to: determine, according to the voltage collected by the ADC and the first correspondence, a resistance of the first resistor, where the first correspondence is a preset voltage and Correspondence between the resistance values of the first resistors.

In a possible implementation manner of the first aspect, the detecting circuit includes an ammeter, the first end of the ammeter is connected to the first resistor, and the second end of the ammeter is connected to the power source, and the processor obtains The detection result of the current meter is the current value detected by the current meter.

In a possible implementation manner of the first aspect, the processor is configured to determine a resistance of the first resistor according to the current value and the detection voltage.

In a possible implementation manner of the first aspect, the detecting circuit includes a voltage comparator and a reference circuit, the reference circuit includes an adjustable resistor, and the first end of the adjustable resistor is connected to the power source, and the adjustable resistor is The second end is connected to the first input end of the voltage comparator, the input voltage of the second input end of the voltage comparator is a voltage across the first resistor, and the voltage comparator is configured to compare the voltage across the first resistor and the Referring to the voltage of the circuit, the processor is configured to control the magnitude of the resistance of the adjustable resistor, and obtain an output result of the voltage comparator from the voltage comparator output.

In a possible implementation manner of the first aspect, the processor is configured to: when the output result of the voltage comparator changes, determine a resistance value of the adjustable resistor when the output result of the voltage comparator changes; When the output of the voltage comparator changes, the resistance of the adjustable resistor and the second correspondence determine the resistance of the first resistor, and the second correspondence is a preset resistance and a resistance of the first resistor. The correspondence between values.

In a possible implementation manner of the first aspect, the attributes of the USB cable include: at least one of the USB cable data transmission capability and the current transmission capability of the USB cable.

In a second aspect, a USB cable is provided, the USB cable includes a USB plug, a USB socket, and a cable, and the signal of the USB cable includes a first resistor, and the first resistor is disposed on the USB At the pin of the plug or USB socket, the resistance of the first resistor is used to identify the properties of the USB cable.

The USB cable provided by the second aspect, the first resistor is used to uniquely identify the identity of the USB cable, that is, the resistance of the first resistor is used to identify the USB cable. The attribute of the USB cable is identified by the first resistance of the USB cable, and the security of the user using the USB cable for charging can be improved on the basis of reducing the manufacturing cost of the USB cable.

In a possible implementation of the second aspect, the signal channel is a configuration channel CC.

In a possible implementation manner of the second aspect, the attributes of the USB cable include: at least one of a data transmission capability of the USB cable and a current transmission capability of the USB cable.

The third aspect provides a charging system, comprising the charging device in any one of the foregoing first aspect or the first aspect, and the USB in any one of the foregoing possible implementation manners Cable.

The charging system provided by the third aspect can adjust the charging current when charging the terminal device according to the cable property of the USB. Avoid the occurrence of hidden dangers such as burning of the USB cable caused by excessive charging current, and improve safety. It can also fully utilize the ability of the USB cable to transmit current, improve the use efficiency of the USB cable, and improve the user experience.

DRAWINGS

FIG. 1 is a schematic diagram of pin definition of a USB Type-C interface according to an embodiment of the present application.

2 is a schematic diagram of the circuit configuration on the CC1/CC2 pin of the TYPE-C protocol.

3 is a schematic block diagram showing the structure of a charging apparatus of one embodiment of the present application.

4 is a schematic block diagram showing the structure of a charging device and a USB cable according to an embodiment of the present application.

FIG. 5 is a schematic diagram showing the structure of a detecting circuit of an embodiment of the present application.

FIG. 6 is a schematic diagram showing the structure of a detecting circuit of another embodiment of the present application.

FIG. 7 is a schematic diagram of a structure of a detecting circuit of another embodiment of the present application.

FIG. 8 is a typical application scenario diagram of the present application.

9 is a schematic flow chart of charging of an embodiment of the present application.

detailed description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The terminal device in the embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or User device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks, or in the future evolution of the Public Land Mobile Network (PLMN) The terminal device and the like are not limited herein.

With the rapid development of the terminal product market and consumer products in recent years, the battery capacity of terminal devices is getting larger and larger, and the charging current is also increasing. This has caused more and more market users to reflect the safety issues such as burning and cable burning when terminal devices (such as mobile phones) are charging with USB cables. A large part of the reason is that the USB cable used for charging is caused by non-standard cables whose quality cannot be guaranteed or whose specifications do not meet the charging requirements, which may cause serious damage to the user's personal and property. At present, the high-end markets in Japan and Europe and the United States are very strict on the safety of such electrical appliances. Some countries have clear legal requirements. If the fault reaches a certain level, they will face all recalls and severe penalties for the products. Therefore, it will become more and more urgent to solve such charging safety problems. .

The current USB cable identification method is to identify the cable in the USB TYPE-C protocol by defining an Electrically Marked Cable. The solution is to package the USB Type-C cable with the E-Marker chip by encapsulating a chip into the USB cable. The downlink port (master device) and the uplink port (slave device) can read the USB by using the PD protocol. The properties of the cable. For example, the maximum current or data transmission capability information that can be carried by the USB cable is obtained. According to the properties of the USB cable, the charging current is adjusted to ensure the safety of the user. For example, suppose the user is charging the mobile phone with the charging treasure, the charging treasure connects the mobile phone through the USB cable, the charging treasure detects the chip inside the USB cable, and recognizes the identity of the USB cable by reading the ID information in the chip. Obtain the power transmission capability, data transmission capability, ID, and other information of the USB cable. Therefore, the charging current output of the charging treasure can be adjusted according to the properties of the USB cable, thereby avoiding safety problems such as burning of the USB cable and burning of the cable.

However, the method of using a packaged chip to identify a USB cable in a USB cable is expensive to manufacture, and it is difficult to mass-produce. Therefore, how to ensure that users are in urgent need of solving the problem when using a USB cable without a chip.

Based on the above problems, the present application provides a USB cable and a charging device, which can effectively solve the security problem when the user uses the USB cable for charging.

The present application provides a USB cable, which includes a USB plug, a USB socket, and a cable. The circuit of the USB cable includes a first resistor, and the first resistor is disposed on the USB plug or At the pin of the USB socket, the resistance of the first resistor is used to identify the properties of the USB cable.

The USB cable provided by the present application is configured to set a first resistance in the USB cable, the first resistor is used to uniquely identify the identity of the USB cable, that is, the resistance of the first resistor is used to identify the USB cable. The attribute, for example, may be a first resistor to identify the current transfer capability, data transfer capability, etc. of the USB cable. That is, the first resistor is used to distinguish different USB cables. The attribute of the USB cable is identified by the first resistance of the USB cable, and the security of the user when using the USB cable for charging can be improved on the basis of reducing the manufacturing cost of the USB cable.

Specifically, the USB cable includes a USB plug, a USB socket, and a cable. The USB plug can be a USB plug of a standard TYPE-C interface, or a USB plug of a TYPE-A or TYPE-B interface. The USB socket can also be a USB socket of a standard TYPE-C interface, or a USB socket of a TYPE-A or TYPE-B interface. The signal passing through the USB cable includes a first resistor disposed at a pin of the USB plug or USB socket. The resistance of the first resistor is used to identify the properties of the USB cable. This pin can be either a USB plug or a USB socket. For example, the pin can be positive voltage data D+, negative voltage data D-, and null ID. Or it can be the Typc-C interface defined by the USB 3.1 specification. The positive receiving 1 differential bus RX1+, the negative receiving 1 differential bus RX1-, the positive receiving 2 differential bus RX2+, the negative receiving 2 differential bus RX2-, the positive transmitting 1 differential bus TX1+ Negative transmission 1 differential bus TX1-, positive transmission 2 differential bus TX2+, negative transmission 2 differential bus TX2-, first sideband signal line SBU1, second sideband signal line SBU2, first configuration channel (channel configuration, CC) Any one of the signal line CC1 and the second configuration channel signal line CC2.

Since the USB Type-C interface has upper and lower symmetrical pins, the function of forward and reverse insertion can be realized. Therefore, more and more terminal devices use USB Type-C interfaces as plugs or sockets in the form of USB Type-C interfaces as an example. Description of each pin.

Figure 1 is a schematic diagram of each pin in the USB Type-C interface. The functions and supported protocols of each pin in the USB Type-C interface are as follows:

TX/RX: Also called USB3.1 data cable. There are two sets of differential signals for USB 3.1 data transfer.

CC1/CC2: The USB Type-C interface contains two CC signal pins, CC1 pin and CC2 pin. It is mainly used for function negotiation and is the two key pins in the Type-C interface. The signals on the CC1 and CC2 pins determine the direction in which the interface is inserted and can be used to negotiate the power supply, alternate mode, and peripheral mode on the interface.

D+/D-: Also known as the USB2.0 data cable, mainly for compatibility with the previous USB 2.0 standard. There are two sets of differential signals for USB 2.0 data transfer.

SBU1/SBU2: Reserved pins in the USB Type-C interface, which have different uses in different application scenarios, such as audio transmission channels or microphone transmission channels.

GND: For grounding cable.

VBUS: For cable bus power.

The first resistor can be provided on any of the above pins of a USB plug or a USB socket having a USB Type-C interface. The resistance of the first resistor is used to identify the properties of the USB cable.

Give an example. Suppose a manufacturer produces three sizes of USB cables. They are USB cable A, USB cable B, and USB cable C. The current transfer capability of each type of USB cable is different. Assume that the current tolerance of the USB cable A is 1A, the current carrying capacity of the USB cable B is 2A, and the current carrying capacity of the USB cable C is 3A. Therefore, resistors of different resistance values can be set in the three USB cables, respectively. Assume that the resistance of the first resistor in the USB cable A is 10KΩ, the resistance of the first resistor in the USB cable B is 15KΩ, and the resistance of the first resistor in the USB cable is 20KΩ. When the user uses the USB cable of different specifications to charge the terminal device, the charging device (for example, charging treasure) can detect the resistance value of the first resistor, and determine the resistance value of the first resistor, according to the resistance value corresponding to the resistance. The current transmission capability of the USB cable and other information, and adjust the current when the terminal device is charged by the USB cable. Avoid the safety hazards caused by burning USB cable and cable during charging.

It should be understood that the interface of the USB plug or the USB socket may be a standard TYPE-C interface, or may be a TYPE-A or a TYPE-B interface. The embodiments of the present application are not limited herein.

Optionally, the first resistor is disposed on a configuration channel CC pin of the USB plug or the USB socket.

2 is a schematic diagram of the circuit configuration on the CC1/CC2 pin defined by the TYPE-C protocol. The circuit in the dotted line portion of FIG. 2 is in the USB cable, the solid line portion is located in the downlink port, and the downlink port can be understood as the USB interface of the main charging device. In the figure, the resistors Rp and Rd are connected to the CC1 pin. The devices connected at both ends of the USB cable can determine the master and slave devices by detecting Rd. The resistor Rp on the CC1 pin is used to form the detection circuit, and the CC2 pin is connected. Resistors Rp and Ra, devices connected at both ends of the USB cable can be debugged by the circuit on the CC2 pin. For the standard TYPE-C interface USB cable, the resistance of the resistor Ra on the CC2 pin is fixed. In the present application, the resistance of the resistor Ra can be reset, that is, the resistance Ra can be replaced with the first resistor. The resistance of the first resistor is different for USB cables of different specifications, that is, different first resistors represent different USB cable specifications, and are used for identifying current transmission capabilities of USB cables of different specifications.

It should be understood that in the embodiment of the present application, the first resistance setting may also be disposed on other pins of the USB plug or the USB socket. For example, it is set on the above SBU1/SBU2 pin and so on. The embodiments of the present application are not limited herein.

Optionally, the attributes of the USB cable include: at least one of the USB cable data transmission capability and the current transmission capability of the USB cable.

Specifically, since the first resistance of the USB cable is set in the USB cable, the resistance of the first resistor is different for different USB cables. The USB cable attribute may include a data transmission capability of a USB cable, a current transmission capability, and the like. For example, suppose the first resistance of a USB cable of a certain specification is 20KΩ, and the current transmission capability of the USB cable is 1A, that is, as long as the value of the first resistance in the USB cable is detected to be 20KΩ, The resistance value of a resistor determines that the current transmission capability of the USB cable is 1A, and the data transmission capability of the USB cable, the ID of the USB cable, and the manufacturer and the like may be determined according to the resistance value of the first resistor.

It should be understood that, in the embodiment of the present application, the attributes of the USB cable may further include other performance information of the USB cable, for example, maximum load current, maximum load voltage, manufacturer, and the like. The embodiments of the present application are not limited herein.

The present application also provides a charging device. As shown in FIG. 3, the charging device 100 includes:

The charging device includes a detection circuit 110, a USB interface 130, and a processor 130.

The USB interface 120 is configured to connect a USB cable, and the circuit of the signal channel of the USB cable includes a first resistor, and the resistance of the first resistor is used to identify an attribute of the USB cable;

The detecting circuit 110 is configured to detect the first resistor and report the detection result to the processor 130. The first end of the detecting circuit is connected to the first resistor through the USB interface 120. The second end of the detecting circuit 110 Connected to the power source 140 of the charging device, the detecting circuit acquires a detection voltage from the power source 140;

The processor 130 is configured to: acquire a detection result of the detection circuit;

Determining a resistance value of the first resistor according to the detection result of the first resistor;

The attribute of the USB cable is determined according to the resistance of the first resistor.

Specifically, as shown in FIG. 3, the charging device 100 may be a terminal device having a power supply capability, for example, may be a charging treasure, a mobile router (Mobile Wifi, MIFI), or the like. The charging device 100 includes a detection circuit 110, a USB interface 120, and a processor 130. The USB interface 120 can be a TYPE-C interface. For the specific structure, refer to FIG. 1 . Alternatively, it may be a TYPE-B or a TYPE-A interface, etc., and the embodiment of the present application is not limited herein.

The USB interface 120 is configured to connect a USB cable. The circuit of the signal channel of the USB cable includes a first resistor. The resistance of the first resistor is used to identify the attribute of the USB cable. The USB cable can be any of the USB cables provided in the foregoing embodiments of the present application. For a description of the USB cable, reference may be made to the description of the USB cable provided in the present application, which is not described herein. The detecting circuit 110 is configured to detect the first resistor, and report the detection result to the processor 130. The first end of the detecting circuit is configured to be connected to the first resistor through the USB interface 120. The two ends are connected to a power source 140 of the charging device, and the power source 140 is used to supply a detection voltage to the detecting circuit. That is, the detection circuit can acquire the detection voltage from the power source 140. The processor 130 can be connected to the detection circuit 110 in a circuit channel manner, or can be connected to the detection circuit 110 in a wireless manner. The processor 130 is configured to acquire the detection result of the detection circuit 110. In FIG. 3, the detection circuit 110 and the processor 130 are connected by a broken line, and the broken line indicates that the detection circuit 110 and the processor 130 may be physically connected, or may be a wireless connection. That is, there is no limitation on the form of connection between the detection circuit 110 and the processor 130. The processor 130 determines the resistance of the first resistor according to the detection result of the first resistor. The attribute of the USB cable is determined according to the resistance of the first resistor. For example, the ability of the USB cable to carry current or the ability to transmit data can be determined. In order to adjust the charging current when charging the other terminal devices through the USB cable.

FIG. 4 is a schematic diagram of the charging device 100 and the USB cable connected. The first end of the detecting circuit 110 is connected to the first end of the first resistor through the USB interface 120, and the second end of the first resistor is connected to the ground of the USB cable. The second end of the detection circuit 110 is coupled to the power source 140 for providing a detection voltage to the detection circuit. The processor 130 is further configured to acquire the detection result of the detection circuit 110. It should be understood that if the first resistor is disposed on the CC pin of the USB cable, the USB interface 120 is connected to the first end of the first resistor through a CC pin, and the second end of the first resistor passes through the CC Ground the ground wire on the foot. If the first resistor is disposed on other pins of the USB cable, correspondingly, the USB interface 120 is connected to the first end of the first resistor through other pins of the CC pin, and the second end of the first resistor Ground through the ground wire of other pins.

The charging device provided by the present application can detect the resistance of the first resistor in the USB cable through a detecting circuit to determine the attribute of the USB cable. For example, information such as a maximum carrying current and a maximum carrying voltage of the USB cable can be determined, so that the performance of the USB cable can be determined, so as to improve the USB cable when the terminal device is subsequently charged by the USB cable. Safety, improve the safety of users when charging.

It should be understood that the charging device provided by the present application may be any terminal device having the capability of providing power, for example, may be a mobile phone, a computer, a wearable device, or the like. The embodiments of the present application are not limited herein.

It should also be understood that the processor 130 may be based on the correspondence between the resistance of the first resistor and the attribute of the USB cable in one or more types of USB cables stored in the charging device 100 in advance, different models. USB cables have different properties. For example, the correspondence may be stored in a storage unit of the charging device 100 in the form of a table. For example, the correspondence can be as shown in Table 1. The processor determines an attribute of the USB cable according to the correspondence. Since the resistance of the first resistor in the same type of USB cable is the same, the model and attributes of the USB cable can be determined according to the value of the first resistor in a USB cable.

Table 1

It should be understood that Table 1 is merely exemplary and should not impose any limitation on the embodiments of the present application. The above correspondence may also include a correspondence between more different resistance values and USB cable attributes. The properties of the USB cable can also include other content. The embodiments of the present application are not limited herein.

It should also be understood that for a charging device produced by the same manufacturer and a plurality of types of USB cables, the charging device 100 can store the resistance values of different first resistors in the various types of USB cables and different resistance values. Corresponding to the properties of different USB cables. When the charging device can determine the properties of the USB cable according to the resistance of the first resistor in the USB cable, it can be determined that the USB cable is produced by the manufacturer itself.

It should also be understood that when the processor 130 in the charging device determines the resistance of the first resistor in the USB cable according to the detection result of the first resistor in the USB cable, or determines the USB cable. The resistance of the first resistor, but the properties of the USB cable cannot be determined. In the correspondence between the resistance value of the first resistor of the USB cable pre-stored in the charging device 100 and the attribute of the USB cable, there is no data corresponding to the resistance value of the first resistor in the USB cable, that is, charging The device 100 cannot recognize the USB cable. The properties of the USB cable cannot be determined.

Optionally, as an embodiment, the processor 130 is configured to:

The magnitude of the output current of the charging device 100 to the USB cable is controlled according to the properties of the USB cable.

Specifically, after the charging device 100 determines the USB cable property, when the charging device is connected to one end of the USB cable, and the other end is connected to the charging point device (for example, a mobile phone), the charging device 100 can be based on the USB device. The cable property, for example, the current transmission capability of the USB cable, controls the magnitude of the output current of the charging device 100 to the USB cable, that is, adjusts the charging current when charging the device to avoid charging current excessively. The occurrence of hidden dangers such as burning of USB cables improves safety. It can also fully utilize the ability of the USB cable to transmit current, for example, increase the charging current within the range that the USB cable can carry, improve the use efficiency of the USB cable, and improve the user experience.

It should be understood that, in the embodiment of the present application, when the processor 130 detects the first resistance in the USB cable (illustrated by using the second USB cable as an example), the first resistance in the second USB cable cannot be determined. The resistance of the second USB cable cannot be determined when the resistance of the first resistor in the second USB cable is determined. For example, a manufacturer's five specifications of USB cable, corresponding to the resistance of five different first resistors. The charging device 100 produced by the manufacturer stores only the attributes of the five USB cables corresponding to the resistance values of the five first resistors. When the resistance of the first resistor in the second USB cable detected by the processor 130 does not correspond to the five resistance values. That is, the charging device 100 does not store the USB cable attribute corresponding to the first resistance in the second USB cable, and proves that the second USB cable is not manufactured by the manufacturer, that is, the charging device 100 cannot determine the USB cable. Attributes. In this case, when the other device is charged by the charging device 100 and the second USB cable, the charging device 100 will control the charging current in accordance with other regulations related to the protocol. For example, the charging current is adjusted to the charging current specified by the standard protocol or adjusted to the minimum charging current. The embodiments of the present application are not limited herein.

Optionally, as an embodiment, the detecting circuit 110 includes:

An analog-to-digital converter (ADC) and a second resistor, the two ends of the second resistor are respectively connected to the power source 140 and the first resistor, and the ADC is connected to the second resistor and the first resistor A circuit between the resistors is configured to collect a voltage across the first resistor, and the processor 130 is configured to obtain a detection result, where the detection result is a voltage collected by the ADC

Specifically, as shown in FIG. 5, the detecting circuit 110 includes an ADC and a second resistor, and the ADC is configured to collect a voltage across the first resistor, and two ends of the second resistor are respectively used for powering the charging device. And connecting to the first end of the first resistor through the USB interface 120, the ADC is connected to a circuit between the second resistor and the first resistor, and the processor 130 is further configured to acquire a detection result of the ADC. The result of the test is the voltage collected by the ADC. The power source 140 is used to supply the detection circuit 110 with a detection voltage.

After the charging device 100 is connected to the USB cable, the power source 140 is configured to provide a detection voltage to the detection circuit 110, the second resistor is used for voltage division, and the second resistor is a fixed value. Since the second end of the first resistor is grounded, the ADC detects the voltage across the first resistor, and the ADC is further configured to report the voltage value collected across the first resistor to the processor 130. Through the detection circuit 110 described above, the ADC can detect the voltage across the first resistor, and the processor 130 can acquire the detection result. The resistance of the first resistor is determined according to the detection result.

Optionally, in an embodiment, the processor is configured to: determine, according to the voltage collected by the ADC and the first correspondence, the resistance of the first resistor, where the first correspondence is a preset Correspondence between the voltage and the resistance of the first resistor.

Specifically, before the charging device 100 detects the resistance of the first resistor in the USB cable, the resistance of the first resistor in one or more types of USB cables may be preset and the attributes of the USB cable are Correspondence between the two, and preset the correspondence between the resistance of the first resistor and the voltage (ie, the first correspondence). Different models of USB cables have different properties. Give an example. For a USB cable, the first resistance is a fixed value, and for the charging device, the value of the second resistance in the detection circuit 100 is fixed. Before the charging device 100 is shipped, the detection circuit 100 in the charging device 100 described above may be used to detect USB cables having different first resistances, that is, different types of USB cables (USB cables of different attributes). The voltages collected by the ADCs corresponding to the first resistors in the USB cables of different attributes are determined, and the correspondence between the voltages collected by the different ADCs and the resistance values of the different first resistors is determined (first correspondence). And the corresponding relationship exists in the storage unit of the charging device. For example, as shown in Table 2,

Table 2

The charging device 100 is connected to a certain USB cable, and the first resistance in the USB cable is detected by the detecting unit circuit 100. After acquiring the voltage collected by the ADC, the processor 130 can determine the resistance value of the first resistor according to the voltage collected by the ADC and the pre-stored correspondence, so that the attribute of the first resistor can be determined. For example, the voltage collected by the ADC is 55mv, and the processor 130 obtains a resistance value of 20KΩ corresponding to the first resistor of 55mv by looking up the table. The resistance of the first resistor is determined to determine the properties of the USB cable.

It should be understood that Table 2 is merely exemplary and should not impose any limitation on the embodiments of the present application. The above correspondence may also include a correspondence between more voltages and resistance values. The USB cable properties can also include other content. The embodiments of the present application are not limited herein.

It should also be understood that when the processor 130 obtains the voltage collected by the ADC, the resistance of the first resistor cannot be known by looking up the table. For example, when there is no resistance of the first resistor corresponding to the voltage collected by the ADC, The properties of the USB cable cannot be determined, in which case the charging device 100 will control the charging current in accordance with other provisions of the protocol when charging the other device with the charging device 100 and the USB cable. For example, the charging current is adjusted to the charging current specified by the standard protocol or the minimum charging current. The embodiments of the present application are not limited herein.

Optionally, as an embodiment, the detecting circuit 110 includes an ammeter, the first end of the ammeter is connected to the first resistor, and the second end of the ammeter is connected to the power source 140, and the processor acquires the current. The test result is the current value detected by the current note.

Specifically, as shown in FIG. 6 , the detecting circuit 110 includes an ammeter, the first end of the ammeter is connected to the first resistor, and the second end of the ammeter is connected to the power source 140 of the charging device, and the power source 140 Used to provide a sense voltage to the ammeter. The processor 130 acquires the detection result of the current meter, and the detection result is the current value detected by the current meter.

After the charging device 100 is connected to the USB cable, as shown in FIG. 6, the power source 140 is configured to provide a detection voltage to the first resistor. Since the second end of the first resistor is connected to the ground of the USB cable, Therefore, the current detected by the ammeter is the current flowing through the first resistor. It is equivalent to the power source 140, the ammeter, and the first resistor to form a current loop. After the processor 130 obtains the detection result of the ammeter, the resistance value of the first resistor can be calculated according to the detected voltage value provided by the power source 140.

Optionally, as an embodiment, the processor 130 is configured to determine a resistance of the first resistor according to the current value and the detection voltage.

Specifically, the processor 130 can calculate the resistance value of the first resistor according to the detection result of the current meter and the detection voltage provided by the power source 140 of the charging device, and determine the resistance value of the first resistor, and then In the same manner as above, the attribute of the USB cable is determined by searching a correspondence table between the resistance of the preset first resistor and the attribute of the USB cable.

It should be understood that when the charging device 100 obtains the resistance of the first resistor, the USB cable attribute corresponding to the resistance of the first resistor cannot be obtained by looking up the table. In this case, when the charging device 100 and the USB cable are used to charge other devices, the charging device 100 will control the charging current in accordance with other regulations related to the protocol. For example, the charging current is adjusted to the charging current specified by the standard protocol or the minimum charging current. The embodiments of the present application are not limited herein.

Optionally, as an embodiment, the detecting circuit 110 includes a voltage comparator and a reference circuit, the reference circuit includes an adjustable resistor, and the first end of the adjustable resistor is connected to the power source 140, and the second of the adjustable resistor The terminal is connected to the first input end of the voltage comparator, the input voltage of the second input end of the voltage comparator is a voltage across the first resistor, and the voltage comparator is configured to compare the voltage across the first resistor with the reference circuit The voltage of the processor 130 is used to control the magnitude of the resistance of the adjustable resistor, and the output result of the voltage comparator is obtained from the output of the voltage comparator.

Specifically, as shown in FIG. 7, the detection circuit 110 includes a voltage comparator and a reference circuit, and the voltage comparator is a circuit that compares an analog voltage signal with a reference voltage. The two inputs of the voltage comparator are analog signals, and the output is binary signal 0 or 1. When the difference between the two input voltages increases or decreases and the positive and negative signs do not change, the output remains constant. For example, when the "V +" voltage input terminal is greater than the voltage at the input of "V-", the voltage comparator output (V _out) is 0, when "V +" voltage input terminal is less than or equal to "V-" when the voltage at the input voltage The output of the comparator changes (flips), from 0 to 1.

The voltage comparator is for comparing the voltage across the first resistor with a reference circuit voltage. In FIG. 7, the voltage at the V+ terminal is the voltage across the first resistor, and the voltage at the V- terminal is the voltage of the reference circuit. The reference circuit includes an adjustable resistor, and the resistance of the adjustable resistor can be changed. The first end of the adjustable resistor is coupled to a power source 140 of the charging device, and the power source 140 is configured to provide a detection voltage to the reference circuit. The power supply 140 of the charging device is also coupled to a voltage comparator for providing power to the voltage comparator. The second end of the adjustable resistor is connected to the first input terminal (V- terminal) of the voltage comparator, that is, to the voltage comparator input terminal V-. Since the second end of the first resistor is connected to the ground of the USB cable, the input voltage of the second input terminal (V+ terminal) of the comparator is the voltage across the first resistor. The third resistor in the detecting circuit 100 is used to divide the first resistor, and the resistance of the third resistor is fixed. The fourth resistor is used for the comparator to form a circuit loop, and the resistance of the fourth resistor is also fixed. The processor 130 controls the magnitude of the resistance of the adjustable resistor by controlling, and obtains the output result of the voltage comparator from the output of the voltage comparator.

After the charging device 100 is connected to the USB cable, the power source 140 is used to supply a voltage to the voltage comparator, the reference circuit, and the first resistor. Since the values of the third resistor, the first resistor, and the fourth resistor are fixed for one charging device 100 and one USB cable, the detection voltage supplied to the reference circuit and the first resistor is also fixed. That is, the input voltage at the V+ terminal does not change. Therefore, the processor 130 can control the input voltage of the V- terminal by the resistance of the adjustable resistor, and then according to the output result of the voltage comparator. The resistance of the first resistor is determined.

Optionally, the adjustable resistor may be an array of resistors, and the processor 130 may control the resistor array such that the resistor array outputs different resistance values. The adjustable resistor can also be other variable resistance electronic components. The embodiments of the present application are not limited herein.

Optionally, as an embodiment. The processor 130 is configured to: when the output result of the voltage comparator changes, determine a resistance value of the adjustable resistor when the output result of the voltage comparator changes;

Determining a resistance value of the first resistor according to a resistance value of the adjustable resistor and a second corresponding relationship when the output result of the voltage comparator changes, the second correspondence is a preset resistance value and the first resistance Correspondence between resistance values.

Specifically, before the charging device 100 is shipped from the factory, the correspondence between the resistance of the first resistor of the one or more types of USB cables and the different resistance values of the adjustable resistors may be preset. For a USB cable, the first resistor is a fixed value, and for the charging device, the third resistor and the fourth resistor in the detecting circuit 100 are also fixed, and the charging device 100 can be preliminarily detected before the factory is shipped. Properties of the USB cable (with different resistance values of the first resistor). Determining a correspondence relationship between the resistances of the first resistor and the adjustable resistor in the USB cable of different attributes (second correspondence), that is, recording the first resistance in the USB cable detecting different attributes, in When the output of the voltage comparator is inverted, the resistance of the adjustable resistor is corresponding to the resistance of the first resistor in the USB cable. The USB cable correspondence of different attributes is stored in the charging device 100.

For example, before the charging device 100 is shipped from the factory, the detecting circuit 100 in the charging device 100 preliminarily detects the first resistance in the first USB cable (having the first attribute), for example, when the value of the adjustable resistor When it is 44KΩ, the output of the voltage comparator is inverted, and the resistance of the first resistor and the resistance of the adjustable resistor when the output of the voltage comparator are inverted are recorded. And determine the properties of the USB cable. Detecting a first resistance in the second USB cable (having the second attribute), for example, when the value of the resistance array is 51KΩ, the output of the voltage comparator is inverted, and the resistance of the first resistor and the voltage comparator are recorded. The output of the output is the resistance of the adjustable resistor when it is flipped. And determine the properties of the USB cable. Detecting a first resistance in the third USB cable (having a third attribute), for example, when the value of the resistor array is 56KΩ, the output of the voltage comparator is inverted, and the resistance of the first resistor and the voltage comparator are recorded. The output of the output is the resistance of the adjustable resistor when it is flipped. And determining the attribute of the USB cable, and the corresponding relationship exists in the charging device 100. For example, as shown in Table 3,

table 3

When the charging device 100 is required to charge the terminal device through a USB cable, after the charging device 100 is connected to the USB cable, the resistance of the first resistor in the USB cable is fixed, and the third The resistance is also a fixed value, that is, the input voltage of the V+ terminal of the voltage comparator is constant. The input voltage of the V- terminal of the voltage comparator is related to the resistance of the adjustable resistor, that is, the input voltage of the V- terminal of the voltage comparator is variable. Therefore, the processor 130 changes the resistance of the adjustable resistor, that is, changes the input voltage of the V- terminal of the comparator. And get the output result of the voltage comparator. When the output result of the voltage comparator is inverted, it is proved that the input voltage of the V+ terminal of the voltage comparator is the same as the input voltage of the V- terminal, and the resistance of the adjustable resistor is inverted according to the output result of the voltage comparator, and according to the above preset The second correspondence relationship determines the resistance of the first resistor corresponding to the resistance of the adjustable resistor. For example, the charging device 100 detects the first resistance in the USB cable using the detection circuit 110 described above. For example, the resistance of the adjustable resistor is adjusted such that the output of the voltage comparator is inverted. Assuming that the output of the voltage comparator is inverted, the resistance of the adjustable resistor is 56KΩ. Through the corresponding relationship in Table 2 above, it can be determined that the resistance of the first resistor in the USB cable is 30KΩ, thereby determining the USB cable. Cable properties. After the USB cable property is determined, the charging device is connected to one end of the USB cable, and the other end is connected to the charging point device (for example, a mobile phone), and the charging device can be based on the USB cable property, for example, the USB cable. The current transmission capability, etc., adjusts the charging current when charging the device to be charged, and avoids the occurrence of hidden dangers such as burning of the USB cable caused by excessive charging current, thereby improving safety. It is also possible to fully utilize the ability of the USB cable to transmit current, for example, to increase the charging current within the range that the USB cable can carry, improve the use efficiency of the USB cable, and improve the user experience.

It should be understood that Table 3 is merely exemplary and should not impose any limitation on the embodiments of the present application. The above correspondence may also include a correspondence between more pairs of resistance values. The USB cable properties can also include other content. The embodiments of the present application are not limited herein.

It should also be understood that when the processor 130 in the charging device cannot determine the resistance of the first resistor according to the output result of the voltage comparator and the second correspondence. For example, after all possible values of the adjustable resistor are tried, the output of the voltage comparator has not been inverted, or the resistance of the adjustable resistor is not reversed when the voltage comparator is turned over in the second correspondence described above. The value of the first resistor corresponding to the value, that is, when the attribute of the USB cable cannot be determined. In this case, when the charging device 100 and the USB cable are used to charge other devices, the charging device 100 will control the charging current in accordance with other regulations related to the protocol. For example, the charging current is adjusted to the charging current specified by the standard protocol or the minimum charging current. The embodiments of the present application are not limited herein.

It should also be understood that, in the embodiment of the present application, the specific circuit structure included in the detecting circuit 110 may also be other structures, and the detecting circuit 110 may further include other electronic components for detecting the first resistor. The embodiments of the present application are not limited herein.

It should also be understood that the charging device 100 may further include a storage unit for storing various correspondences described above or a calculation program executed by the processing or the like. The storage unit may also be a storage unit outside the chip of the charging device in the charging device, such as a read-only memory (ROM) or other type of static storage device that can store static information and instructions, and a random access memory. (random access memory, RAM) and so on. The processor mentioned in any of the above may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and an NP, and a digital signal processor. DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or one or more An integrated circuit for controlling the charging god to detect the first resistor.

The present application further provides a charging system, which includes any of the USB cables and charging devices provided by the present application. The charging system is composed of the USB cable and the charging device described above, and its structure is shown in FIG. . For a detailed description, reference may be made to the above description of the USB cable and the charging device. For brevity, no further details are provided herein.

The charging system provided by the present application will be described below with reference to specific examples.

The charging of the mobile phone using the charging system provided by the present application will be described as an example. As shown in FIG. 8, FIG. 8 is a typical application scenario diagram of the charging system provided by the present application. When one end of the USB cable provided in the present application is inserted into the mobile phone and the other end is inserted into the charging device provided by the present application. The specific charging process is shown in Figure 9. The charging device first detects the first resistance in the cable USB. The specific detection method is the above detection method. When the first resistance is detected, the USB cable property is determined according to the resistance of the first resistor. The charging device can adjust the charging current according to the properties of the USB cable. As shown in FIG. 9, the fast charging can be started, and when the temperature of the USB cable rises to a preset temperature threshold, the thermal protection can be activated. For example, the charging device can reduce the charging current and the like. When the temperature continues to rise to the charge stop threshold. The charging device can forcibly stop charging. Alternatively, when the temperature falls below the charge stop threshold, charging can continue. When the first resistance is not detected, or the first resistance is detected, but the USB cable property cannot be determined. The charging device charges according to a charging current specified by a preset standard protocol or a minimum charging current. For example, charging will be completed at a current of 500 mA.

The charging system provided by the present application can adjust the charging current when charging the terminal device according to the cable property of the USB. Avoid the occurrence of hidden dangers such as burning of the USB cable caused by excessive charging current, and improve safety. It can also fully utilize the ability of the USB cable to transmit current, improve the use efficiency of the USB cable, and improve the user experience.

It should be understood that FIG. 9 is merely exemplary. The charging system may also control data transmission rate during data transmission, determine the manufacturer of the USB cable, product number, and the like according to the USB cable property. The embodiments of the present application are not limited herein.

It should also be understood that in various embodiments of the present application, the first, second, etc. are merely meant to indicate that the plurality of objects are different. For example, the first resistor and the second resistor are only intended to indicate different resistances. Rather than having any effect on the resistance itself, the first, second, etc. described above should not impose any limitation on the embodiments of the present application.

It should be understood that the above description is only intended to help those skilled in the art to understand the embodiments of the present application, and not to limit the scope of the embodiments of the present application. It will be apparent to those skilled in the <RTIgt;the</RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Or a combination of any two or any of the above embodiments. Such modifications, changes, or combinations are also within the scope of the embodiments of the present application.

It should be understood that the above description of the embodiments of the present application is emphasized to emphasize the differences between the various embodiments, and the same or similar points that are not mentioned may be referred to each other, and are not described herein again for brevity.

It is also to be understood that the order of the description of the various processes described above is not intended to be a limitation of the order of execution. The order of execution of the processes is determined by the function and the intrinsic logic, and should not be construed as limiting the implementation of the embodiments of the present application.

It should be understood that the terms "and/or" and "at least one of A or B" herein are merely an association describing the associated object, indicating that there may be three relationships, for example, A and/or B, Representation: There are three cases where A exists separately, A and B exist at the same time, and B exists separately. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A charging device, characterized in that the charging device comprises a detecting circuit, a universal serial bus USB interface and a processor,

The USB interface is configured to connect a USB cable, and the circuit of the signal channel of the USB cable includes a first resistor, and the resistance of the first resistor is used to identify an attribute of the USB cable;

The detecting circuit is configured to detect the first resistor, and report the detection result to the processor, where the first end of the detecting circuit is connected to the first resistor through the USB interface, and the detecting circuit is The second end is connected to a power source of the charging device, and the detecting circuit acquires a detection voltage from the power source;

The processor is configured to: acquire a detection result of the detection circuit;

Determining a resistance value of the first resistor according to a detection result of the first resistor;

Determining an attribute of the USB cable according to a resistance of the first resistor.
The charging device according to claim 1, wherein the processor is further configured to:

Controlling, according to an attribute of the USB cable, a magnitude of an output current of the charging device to the USB cable.
A charging apparatus according to claim 1 or 2, wherein

The detecting circuit includes an analog-to-digital converter ADC and a second resistor, two ends of the second resistor are respectively connected to the power source and the first resistor, and the ADC is connected to the second resistor and the first A circuit between the resistors is configured to collect a voltage across the first resistor, and the processor obtains a detection result, where the detection result is a voltage collected by the ADC.
The charging device according to claim 3, wherein the processor is configured to: determine a resistance of the first resistor according to a voltage collected by the ADC and a first correspondence, the first correspondence is a correspondence between a preset voltage and a resistance of the first resistor.
The charging device according to claim 1 or 2, wherein the detecting circuit comprises an ammeter, the first end of the ammeter is connected to the first resistor, and the second end of the ammeter is In the power connection, the processor acquires a detection result of the ammeter, and the detection result is a current value detected by the current note.
The charging device according to claim 5, wherein the processor is configured to determine a resistance of the first resistor according to the current value and the detection voltage.
The charging device according to claim 1 or 2, wherein the detecting circuit comprises a voltage comparator and a reference circuit, the reference circuit comprises an adjustable resistor, the first end of the adjustable resistor and the power source Connecting, the second end of the adjustable resistor is connected to the first input end of the voltage comparator, and the input voltage of the second input end of the voltage comparator is a voltage across the first resistor, the voltage comparison Comparing a voltage across the first resistor and a voltage of the reference circuit, the processor is configured to control a magnitude of a resistance of the adjustable resistor, and obtain the voltage comparator from the voltage comparator output The output.
The charging device according to claim 7, wherein said processor is configured to:

When the output result of the voltage comparator changes, determining the resistance of the adjustable resistor when the output result of the voltage comparator changes;

Determining a resistance value of the first resistor according to a resistance value of the adjustable resistor and a second correspondence relationship when the output result of the voltage comparator changes, and the second correspondence relationship is a preset resistance value and a Corresponding relationship between the resistance values of the first resistors.
The charging device according to any one of claims 1 to 8, wherein the attributes of the USB cable comprise:

At least one of the USB cable data transmission capability and the current transmission capability of the USB cable.
A universal serial bus USB cable, characterized in that the USB cable comprises a USB plug, a USB socket and a cable, and the signal of the USB cable includes a first resistor, the first A resistor is disposed at a pin of the USB plug or USB socket, and a resistance of the first resistor is used to identify an attribute of the USB cable.
The USB cable according to claim 10, wherein the signal channel is a configuration channel CC.
The USB cable according to claim 10 or 11, wherein the attributes of the USB cable comprise:

At least one of a data transmission capability of the USB cable and a current transmission capability of the USB cable.
A charging system comprising the charging device according to any one of claims 1 to 9 and the USB cable according to any one of claims 10 to 12.