CN111525349A - Charging cable, charging device and charging cable protection system - Google Patents

Charging cable, charging device and charging cable protection system Download PDF

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Publication number
CN111525349A
CN111525349A CN202010285396.4A CN202010285396A CN111525349A CN 111525349 A CN111525349 A CN 111525349A CN 202010285396 A CN202010285396 A CN 202010285396A CN 111525349 A CN111525349 A CN 111525349A
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China
Prior art keywords
terminal
circuit
charging
charging cable
male connector
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Granted
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CN202010285396.4A
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Chinese (zh)
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CN111525349B (en
Inventor
聂雄
潘浩
欧应阳
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Hynetek Semiconductor Co ltd
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Hynetek Semiconductor Co ltd
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Priority to CN202010285396.4A priority Critical patent/CN111525349B/en
Priority to PCT/CN2020/105580 priority patent/WO2021208291A1/en
Publication of CN111525349A publication Critical patent/CN111525349A/en
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Publication of CN111525349B publication Critical patent/CN111525349B/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R29/00—Coupling parts for selective co-operation with a counterpart in different ways to establish different circuits, e.g. for voltage selection, for series-parallel selection, programmable connectors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/30—Charge provided using DC bus or data bus of a computer

Abstract

The invention relates to the technical field of charging cables, and discloses a charging cable, a charging device and a charging cable protection system. This charging cable includes public head of USBType-A, public head of USBType-C and first control circuit. The USB Type-A male connector comprises a first CC terminal and a first VBUS terminal, the USB Type-C male connector comprises a second CC terminal, a first control circuit comprises a selection circuit, a first switch circuit and a second switch circuit, the first switch circuit is connected between the first CC terminal and the second CC terminal in series, the second switch circuit is connected with the second CC terminal and the first VBUS terminal respectively, the selection circuit is electrically connected with the first CC terminal, the first switch circuit and the second switch circuit respectively, and the selection circuit is used for controlling the working states of the first switch circuit and the second switch circuit respectively according to electric signals of the first CC terminal so as to control the connection states of the corresponding terminals respectively and realize different charging modes. Therefore, the charging cable can be compatible with different types of charging modes.

Description

Charging cable, charging device and charging cable protection system
Technical Field
The invention relates to the technical field of charging cables, in particular to a charging cable, a charging device and a charging cable protection system.
Background
A Serial Bus (USB, english: Universal Serial Bus, abbreviation) is a Serial Bus standard for connecting a computer system and an external device, and is also a technical specification of an input/output interface, and is widely applied to information communication products such as personal computers and mobile devices, and is extended to other related fields such as photographic equipment, digital televisions (set top boxes), game machines, and the like.
With the increasingly stringent requirements of the mobile device on transmission rate, charging power and interface size, a new generation of USB interface USB Type-C is in force. A complementary USB Power Delivery Specification (USB PD) was also subsequently introduced. The USB PD protocol can support 3A or 5A current, the output voltage is up to 20V, and a special channel for power transmission protocol communication is defined in an interface, so that the charging efficiency is improved.
However, different USB chargers support different charging protocols and have different charging modes, and the conventional charging cable cannot be compatible with the charging modes of different chargers, so that charging efficiency is not high, even a charging function cannot be realized, and user experience is not good.
Disclosure of Invention
The embodiment of the invention provides a charging cable, a charging device and a charging cable protection system, which can be compatible with different charging modes and improve user experience.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a charging cable, including:
the USB Type-A male connector is used for being connected with a charging female socket and comprises a first CC terminal and a first VBUS terminal;
the USB Type-C male connector is used for connecting an external load and comprises a second CC terminal;
the first control circuit comprises a selection circuit, a first switch circuit and a second switch circuit, the first switch circuit is connected in series between the first CC terminal and the second CC terminal, one end of the second switch circuit is connected with the second CC terminal, the other end of the second switch circuit is electrically connected with the first VBUS terminal through a circuit, the selection circuit is respectively and electrically connected with the first CC terminal, the first switch circuit and the second switch circuit, and is used for respectively controlling the working states of the first switch circuit and the second switch circuit according to an electric signal of the first CC terminal so as to respectively control the connection states of the first CC terminal and the second CC terminal and the connection states of the first VBUS terminal and the second CC terminal.
In some embodiments, when the first CC terminal and the second CC terminal are in a connected state and the first VBUS terminal and the second CC terminal are in a disconnected state, the USB Type-a male connector and the USB Type-C male connector are in a first charging mode, and when the first CC terminal and the second CC terminal are in a disconnected state and the first VBUS terminal and the second CC terminal are in a connected state, the USB Type-a male connector and the USB Type-C male connector are in a second charging mode.
In some embodiments, the first control circuit further comprises a voltage conversion circuit electrically connected to the first VBUS terminal and the second switch circuit, respectively, for converting the voltage provided by the first VBUS terminal when in the second charging mode.
In some embodiments, the first control circuit further includes a voltage dividing circuit, electrically connected to the voltage converting circuit and the second switching circuit, respectively, and configured to divide the voltage output by the voltage converting circuit when the charging mode is the second charging mode.
In some embodiments, the first switching circuit includes a first MOS switch tube, the second switching circuit includes a second MOS switch tube, a control end of the first MOS switch tube and a control end of the second MOS switch tube are both connected to the selection circuit, an input end of the first MOS switch tube is connected to the first CC terminal, an output end of the first MOS switch tube is connected to the second CC terminal, an input end of the second MOS switch tube is connected to the voltage dividing circuit terminal, and an output end of the second MOS switch tube is connected to the second CC terminal.
In some embodiments, the selection circuit includes a comparator, a non-inverting input terminal of the comparator is electrically connected to the first CC terminal and the input terminal of the first MOS switch transistor, respectively, an inverting input terminal of the comparator is used for inputting a reference voltage, and an output terminal of the comparator is connected to the control terminal of the first MOS switch transistor and the control terminal of the second MOS switch transistor, respectively.
In some embodiments, the selection circuit includes an inverter, an input end of the inverter is connected to the output end of the comparator and the control end of the first MOS switch tube, respectively, and an output end of the inverter is connected to the control end of the second MOS switch tube.
In some embodiments, the voltage divider circuit comprises a pull-up resistor connected in series between the voltage converter circuit output terminal and the second switch circuit for pulling up the second CC terminal to the output of the voltage converter circuit when in the second charging mode.
In some embodiments, the voltage divider circuit comprises a constant current source connected in series between the voltage conversion circuit and the second switching circuit for providing a constant current when in the second charging mode.
In some embodiments, the charging cable further comprises a fault protection circuit electrically connected to the selection circuit for detecting faults of the USB Type-a male connector, the USB Type-C male connector and the charging cable, and the selection circuit controls the first switch circuit to be turned off when a specific fault occurs.
In a second aspect, an embodiment of the present invention provides a charging device, including:
the charging female seat is used for being electrically connected with an external power supply; and the charging cable is used for electrically connecting the charging female socket and the external load respectively.
In a third aspect, an embodiment of the present invention provides a charging cable protection system, including:
the USB plug comprises a first USB Type-C male head, a second USB Type-C male head and a third CC terminal, wherein the first USB Type-C male head comprises the third CC terminal;
a second USB Type-C male connector, the second USB Type-C male connector comprising a fourth CC terminal;
and the second control circuit comprises a fault detection circuit, a third switch circuit and a control unit, the third switch circuit is respectively connected with the third CC terminal and the fourth CC terminal, and the control unit is respectively and electrically connected with the fault detection circuit and the third switch circuit.
In some embodiments, the third switch circuit is in a default on state.
In some embodiments, the third CC terminal and the fourth CC terminal are both corresponding USB Type-C male configuration channels.
Compared with the prior art, the charging cable provided by the embodiments of the invention comprises a USB Type-a male connector, a USB Type-C male connector and a first control circuit, wherein the USB Type-a male connector is used for connecting a charging female socket, the USB Type-a male connector comprises a first CC terminal and a first VBUS terminal, the USB Type-C male connector is used for connecting an external load, the USB Type-C male connector comprises a second CC terminal, the first control circuit comprises a selection circuit, a first switch circuit and a second switch circuit, the first switch circuit is connected in series between the first CC terminal and the second CC terminal, one end of the second switch circuit is connected with the second CC terminal, the other end of the second switch circuit is connected with the first VBUS terminal, the selection circuit is respectively electrically connected with the first CC terminal, the first switch circuit and the second switch circuit, and is used for respectively controlling the working states of the first switch circuit and the second switch circuit according to an electrical signal of the first CC terminal, to control the connection states of the first and second CC terminals, and the first and second VBUS terminals, respectively. Therefore, female seat charges to different Type-A, and first CC terminal signal of telecommunication is different, and according to this signal of telecommunication, the connection status of the corresponding terminal of this charging cable control selects the corresponding mode of charging to the Type of the female seat that charges is matched to realize the purpose of the mode of charging of compatible different grade Type.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1a is a schematic structural diagram of a charging device according to an embodiment of the present invention;
FIG. 1b is a schematic diagram of an interface definition for a USB Type-C port;
FIG. 1c is a schematic diagram of an interface definition for a USB Type-A port;
fig. 2 is a schematic structural diagram of a charging cable according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging cable according to another embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of a charging cable according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a charging cable according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a charging cable according to yet another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a charging cable protection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The charging cable of the embodiment of the present invention may be used for any suitable type of electronic device having a USB interface circuit for charging, for example, in some embodiments, the electronic device may be any electronic product such as an adapter, a smart phone, a notebook computer, a smart wearable device, a watch, and the like.
Referring to fig. 1a, an embodiment of the present invention provides a charging device 100, as shown in fig. 1a, the charging device 100 includes a female charging socket 20 and a charging cable 10, wherein the female charging socket 20 is electrically connected to an external power source 200, and the charging cable 10 is electrically connected to the female charging socket 20 and an external load 300, respectively. The external power source 200 charges the external load 300 through the charging cable 10.
In some embodiments, the charging female socket 20 may take various forms, such as: various chargeable electronic devices such as a mobile phone charging head, a vehicle-mounted charging port, a computer charging port and the like. Which is connected to an external power source 200, and can convert and process the voltage of the external power source 200 accordingly to supply the external load 300 through the charging cable 10.
The Type of charging cable 10 and the Type phase-match of female seat 20 that charges, female seat 20 that charges are USB Type-A port (USB-A port for short), and the interface that charges of external load 300 is USB Type-C port (USB-C for short), and this charging cable 10 changes USB Type-A to USB Type-C cable, and two public heads that include are USB-A public head and USB-C public head respectively, and wherein, USB-A public head connects the USB-A port of female seat 20 that charges, and USB-C public head connects the USB-C port of external load 300.
The USB-C port supports a USB Power delivery specification (USB PD) protocol, can bear 3A or 5A current, has the highest output voltage of 20V, defines a special channel for Power transmission protocol communication in the port, can finish intelligent self-adaptive charging regulation between charging and powered equipment, and improves charging efficiency. In connection with FIG. 1b, the port definition of the Type-C port is shown in FIG. 1b, and the port is divided into two rows, each row having 12 signal pins. Among them, 4 power pins are the power VBUS of USB, which is a4, B4, a9 and B9. In addition, 4 grounding pins are all the USB grounding GND, namely A1, B1, A12 and B12. Two different USB Type-C sockets are connected through a Type-C connecting wire. There is a Type-C public head respectively at Type-C's connecting wire both ends. The pins A4, B4, A9, and B9 in the male USB Type-C are connected together in a connecting line, while the pins A1, B1, A12, and B12 in the male USB Type-C are also connected together in a connecting line. And the CC pin in the USB Type-C male is a configuration channel which is a newly added key channel in the USBType-C, and the reference is used for detecting USB connection, detecting positive and negative insertion, data connection between USB devices, establishment and management of VBUS and the like.
Referring to fig. 1c, the USB3.1 standard USB-a port is defined as shown in fig. 1c, wherein pins 1-4 are conventional USB2.0 pins, pins 5, 6, 8 and 9 are USB3.1 high-speed data pins, and pin 7 is a ground pin dedicated for high-speed signal lines.
If a general USB-a charger can also support the PD protocol fast charging, a CC pin may be replaced with a 7 pin (ground pin) defined by USB3.1 on the USB socket, so that the USB socket can perform PD protocol communication, and the defined 7 pin is referred to as a CC _ a pin. The USB-A port of the matched USB-A-to-USB-C cable also changes the 7 pins into the CC pins. However, such a customized cable is not compatible with a USB Type-a charger supporting USB3.1, because when such a cable is used to connect a normal USB3.1 USB Type-a charger for charging, the CC _ a pin defined on the USB3.1 female socket is grounded to pull the CC pin level on the USB-C male socket low, and thus the charging function cannot be realized. Therefore, the general charging cable 10 cannot be compatible with different charging sockets 20 to realize the charging function.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a charging cable 10 according to an embodiment of the present invention, as shown in fig. 2, the charging cable 10 includes a USB Type-a male plug 11, a USB Type-C male plug 12 and a first control circuit 13, wherein the first control circuit 13 includes a first switch circuit 131, a second switch circuit 132 and a selection circuit 133, wherein the first switch circuit 131 is electrically connected to the first CC terminal 111 and the second CC terminal 121 respectively for controlling connection states of the first CC terminal 111 and the second CC terminal 121, when the first switch circuit 131 is in a conducting state, the first CC terminal 111 and the second CC terminal 121 are in a conducting state, the USB Type-a male plug 11 and the USB Type-C male plug 12 are in a first charging mode, the second switch circuit 132 is electrically connected to the first VBUS terminal 112 and the second CC terminal 121 respectively, for controlling the connection state of the first VBUS terminal 112 and the second CC terminal 121, and the selection circuit 133 is electrically connected to the first CC terminal 111, the first switch circuit 131 and the second switch circuit 132, respectively, for controlling the operation state of the first switch circuit 131 and the second switch circuit 132 according to the electrical signal of the first CC terminal 111. Specifically, when the second switch circuit 132 is in the on state, the first VBUS terminal 112 and the second CC terminal 121 are in the connected state, and the USB Type-a male connector 11 and the USB Type-C male connector 12 are in the second charging mode.
Therefore, for different USB Type-a charging female sockets 20, the electrical signals at the first CC terminal 111 are different, and according to the electrical signals, the charging cable 10 can select a corresponding charging mode to match the Type of the charging female socket 20, so as to achieve the purpose of being compatible with different types of charging modes.
The charging modes supported by the female charging socket 20 are different, the electric signal at the first CC terminal 111 of the USB Type-a male connector 11 is different, when the charging female socket 20 supports the first charging mode, the first control circuit 13 detects that the electric signal at the first CC terminal 111 is the first electric signal, the first CC terminal 111 and the second CC terminal 121 are controlled to be in a connected state, and the USB Type-a male connector 11 and the USB Type-C male connector 12 communicate through the first CC terminal 111 and the second CC terminal 121, the communication protocol is a first communication protocol, specifically a PD protocol, when the charging female socket 20 supports the second charging mode, the first control circuit 13 detects that the electric signal at the first CC terminal 111 is the second electric signal, the first VBUS terminal 112 and the second CC terminal 121 are controlled to be in a connected state, Type-C can normally carry out and shake hands, realizes the charge mode through D +/D-shaking hands.
It is understood that, in some embodiments, the charging manners may further include other types of charging manners besides the first charging manner and the second charging manner, and likewise, when the charging female socket 20 supports other types of charging manners, the first control circuit 13 controls the corresponding terminals to connect, so that the USB Type-a male plug 11 and the USB Type-C male plug 12 communicate through the corresponding terminals to support other types of charging protocols.
In some embodiments, the selection circuit 133 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a single chip, an arm (acorn RISC machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the selection circuit 133 may be any conventional processor, controller, microcontroller, or state machine. The selection circuit 133 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP, and/or any other such configuration.
The first switch circuit 131 and the second switch circuit 132 may be any type of switch circuit such as a contactor, a relay, an electronic switch, a time delay switch, a photoelectric switch, a tact switch, a proximity switch, a switch tube, a double-control switch, or any combination of these switches.
The electrical signal at the first CC terminal 111 may be embodied in the form of a voltage, a current, or a power, etc.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a charging cable according to another embodiment of the present invention, as shown in fig. 3, the first control circuit 13 further includes a voltage converting circuit 134 and a voltage dividing circuit 135, the voltage converting circuit 134 is electrically connected to the first VBUS terminal 112 and the voltage dividing circuit 135, the voltage dividing circuit 135 is electrically connected to the voltage converting circuit 134 and the second switching circuit 132, respectively, when the charging mode is the second charging mode, the first VBUS terminal 112 and the second CC terminal 121 are in a connected state, the USB Type-a male terminal 11 and the USB Type-C male terminal 12 establish a communication connection, wherein the USB Type-a male terminal 11 is connected to the external power source 200, the voltage variation range at the first VBUS terminal 112 is wide, if the first VBUS terminal 112 and the second CC terminal 121 are directly connected through the voltage dividing circuit 135, the voltage at the second CC terminal 121 exceeds the Type-C voltage range, causing a handshake failure, the voltage at the first VBUS terminal 112 is reduced to a constant voltage by the voltage converting circuit 134, and then is provided to the second CC terminal 121 by the voltage dividing circuit 135, so that a handshake can be successful no matter how the VBUS voltage changes.
In some embodiments, please continue to refer to fig. 3, the charging cable 10 further includes a fault protection circuit 14 electrically connected to the selection circuit 133 for detecting faults of the USB Type-a male connector 11, the USB Type-C male connector 12 and the charging cable 10, when the USB Type-a male connector 11, the USB Type-C male connector 12 or the cable has a fault, the fault protection circuit 14 detects the fault and sends a fault detection signal to the selection circuit 133, so that the selection circuit 133 can disconnect the USB Type-a male connector 11 and the USB Type-C male connector 12 by controlling the first switch circuit 131 or the second switch circuit 132 to disconnect, the charging connection is interrupted, and the protection function is implemented.
Therefore, the charging cable 10 can be compatible with different charging modes by controlling the working states of the first switch circuit 131 and the second switch circuit 132 to control the connection modes of the USB Type-a male connector 11 and the USB Type-C male connector 12.
Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a charging cable according to an embodiment of the present invention, as shown in fig. 4, a first CC terminal 111 is a CC2A terminal (pin 7) of a USB-a male connector and is connected to the pin 7 of the charging female socket 20, a first VBUS terminal 112 is a VBUS terminal (power source terminal) of the USB-a male connector, and a second CC terminal 121 is a CC2C terminal (CC pin) of the USB-C male connector.
The first switch circuit 131 includes a first MOS switch Q1, the second switch circuit 132 includes a second MOS switch Q2, the control end of the first MOS switch Q1 and the control end of the second MOS switch Q2 are both connected to the selection circuit 133, the input end of the first MOS switch Q1 is connected to the CC2A, the output end of the first MOS switch Q1 is connected to the CC2C, the input end of the second MOS switch Q2 is connected to the voltage conversion circuit 134, and the output end of the second MOS switch Q2 is connected to the CC 2C.
The selection circuit 133 comprises a comparator U1, wherein the non-inverting input terminal of the comparator U1 is electrically connected to the terminal CC2A and the input terminal of the first MOS switch Q1, and the inverting input terminal of the comparator U1 is used for inputting the reference voltage VREFThe output end of the comparator U1 is connected to the control end of the first MOS switch Q1 and the control end of the second MOS switch Q2, respectively.
The voltage conversion circuit 134 is connected in series between the VBUS terminal and the second MOS switch Q2, and is configured to perform a voltage reduction process on the voltage provided by the VBUS terminal.
In the embodiment of the present invention, the first MOS switch Q1 is an N-type MOS switch and the second MOS switch Q2 is a P-type MOS switch, so that the input terminal of the first MOS switch Q1 is the source thereof, the output terminal of the first MOS switch Q1 is the drain thereof, the control terminal of the first MOS switch Q1 is the gate thereof, similarly, the input terminal of the second MOS switch Q2 is the source thereof, the output terminal of the second MOS switch Q2 is the drain thereof, and the control terminal of the second MOS switch Q2 is the gate thereof.
If the female charging socket 20 is a special USB-A charger, the special USB-A charger has a CC pin to support the PD protocol power supply, and the voltage V at the CC2A end is the CC2A end of the USB-A male connector because the CC2A end is connected with the CC pin of the special USB-A chargerCC2AIs pulled high when VCC2AGreater than a reference voltage VREFDuring the process, the comparator U1 outputs a high level signal, the high level signal acts on the control ends of the first MOS switch tube Q1 and the second MOS switch tube Q2 respectively, so that the first MOS switch tube Q1 is conducted, the second MOS switch tube Q2 is cut off, the CC2A end of the USB-A male connector is connected with the CC2C end of the USB-C male connector through the first MOS switch tube Q1, the USB-A male connector and the USB-C male connector are charged through a first charging mode, specifically, PD communication is carried out, and rapid charging of the USB PD is achieved.
If the female charging socket 20 is a common USB-A charger, the CC2A end of the USB-A male connector is grounded or suspended, and the voltage V at the CC2A endCC2ALower, when VCC2ALess than reference voltage VREFWhen the USB-C male plug is used, the comparator U1 outputs a low level signal, the low level signal respectively acts on the control ends of the first MOS switch tube Q1 and the second MOS switch tube Q2, so that the first MOS switch tube Q1 is turned off, the second MOS switch tube Q2 is turned on, the VBUS end of the USB-A male plug is connected with the CC2C end of the USB-C male plug through the second MOS switch tube Q2, a certain voltage is provided at the CC2C end of the USB-C male plug, and the USB-A male plug and the USB-C male plug are charged in a second charging modeAnd charging, specifically charging in a D +/D-handshake mode.
Therefore, the charging cable 10 can match the charging Type of the charging female socket 20 by controlling the connection state of the corresponding terminals of the USB Type-a male plug 11 and the USB Type-C male plug 12, so as to be compatible with different charging modes.
Referring to fig. 5, fig. 5 is a schematic circuit structure diagram of a charging cable according to another embodiment of the present invention, as shown in fig. 5, the selection circuit 133 further includes an inverter U2, an input terminal of the inverter U2 is connected to an output terminal of the comparator U1 and a control terminal of the first MOS switch Q1, and an output terminal of the inverter U2 is connected to a control terminal of the second MOS switch Q2. In the embodiment of the present invention, the first MOS switch Q1 is an N-type MOS switch, and the second MOS switch Q2 is also an N-type MOS switch.
The voltage divider circuit 135 includes a pull-up resistor RPThe pull-up resistor RPAnd the second MOS switch Q2 is connected in series between the voltage converting circuit 134 and the second MOS switch Q8932, and is configured to pull up the terminal CC2C to the output of the voltage converting circuit 134 when in the second charging mode, and divide the voltage to an appropriate potential through a voltage dividing resistor.
When the charging socket 20 is a special USB-A charger, V is setCC2AGreater than a reference voltage VREFWhen the USB-A male connector is connected with the CC2C end of the USB-C male connector through the first MOS switch tube Q1, the comparator U1 outputs a high-level signal, the high-level signal acts on the control end of the first MOS switch tube Q1 to enable the first MOS switch tube Q1 to be conducted, meanwhile, the high-level signal acts through the inverter U2 to output a low-level signal, the low-level signal acts on the control end of the second MOS switch tube Q2 to enable the second MOS switch tube Q2 to be turned off, and therefore the CC2A end of the USB-A male connector is connected with the CC2C end of the USB-C male connector through the first MOS switch tube Q1, and the USB-A male connector and the USB-C male connector are charged through a.
When the charging socket 20 is a normal USB-A charger, V is setCC2ALess than reference voltage VREFMeanwhile, the comparator U1 outputs a low level signal, the low level signal acts on the first MOS switch tube Q1 to turn off the first MOS switch tube Q1, meanwhile, the low level signal is processed by the inverter U2, the inverter U2 outputs a high level signal, the high level signal acts on the second MOS switch tube Q22, the second MOS switch Q2 is turned on, so that the VBUS terminal of the USB-a male connector is connected to the CC2C terminal of the USB-C male connector through the second MOS switch Q2, and the USB-a male connector and the USB-C male connector are charged through a second charging mode.
In conclusion, the charging cable 10 can match the charging Type of the charging female socket 20 by controlling the connection state of the USB Type-a male plug 11 and the USB Type-C male plug 12 corresponding to the terminals, so as to be compatible with different charging modes.
Referring to fig. 6, fig. 6 is a schematic circuit diagram of a charging cable according to another embodiment of the present invention, the only difference between the charging cable 10 and fig. 5 is that the voltage dividing circuit 135 includes a constant current source IPThe constant current source IPAnd the second MOS switch tube Q2 is connected in series between the voltage conversion circuit 134 and the second MOS switch tube Q2 for providing a constant current when in the second charging mode. The constant current enables the CC2C end of the USB-C male connector to have a certain voltage, and the USB-A male connector and the USB-C male connector are charged in a second charging mode.
In conclusion, the charging cable 10 can match the charging Type of the charging female socket 20 by controlling the connection state of the USB Type-a male plug 11 and the USB Type-C male plug 12 corresponding to the terminals, so as to be compatible with different charging modes.
Referring to fig. 7, fig. 7 shows a protection system for a charging cable according to an embodiment of the present invention, as shown in fig. 7, the protection system 700 includes a first USB Type-C male connector 71, a second USB Type-C male connector 72 and a second control circuit 73, wherein the first USB Type-C male connector 71 includes a third CC terminal 711, the second USB Type-C male connector 72 includes a fourth CC terminal 721, the third CC terminal 711 is a configuration channel of the first USB Type-C male connector 71, the fourth CC terminal 721 is a configuration channel of the second USB Type-C male connector 72, the second control circuit 73 includes a fault detection circuit 731, a third switch circuit 732 and a control unit 733, the third switch circuit 732 connects the third CC terminal 711 and the fourth CC terminal 721, the control unit electrically connects the fault detection circuit 731 and the third switch circuit 732, respectively, when there is no fault, when the circuits are in a normal working state, the third switch circuit 732 is in a conducting state, and when the fault detection circuit 731 detects that the first USB Type-C male head 71, the second USB Type-C male head 72 or the charging cable has a fault, for example, when the VBUS voltage overvoltage, the flowing current overcurrent, the cable over-temperature and other faults of the first USB Type-C male head 71 or the second USB Type-C male head 72 occur, the control unit 733 controls the third switch circuit 732 to turn off, so that the third CC terminal 711 and the fourth CC terminal 721 are disconnected, the handshake connection between the two is disconnected, the charging connection is interrupted, and the protection function is further realized.
When the fault detection circuit 731 detects a specific fault, such as a VBUS voltage overvoltage, a flowing current overcurrent, a cable overtemperature, etc., the control unit 733 controls the third switch circuit 732 to disconnect, so as to disconnect the handshake of Type-C, and interrupt the charging connection, thereby implementing the protection function.
In summary, when the fault detection circuit 731 detects a fault, the control unit 733 in the charging cable protection system controls the third switch circuit 732 to be turned off so that the charging connection is interrupted, thereby implementing the protection function.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (14)

1. A charging cable, characterized in that the charging cable comprises:
the USB Type-A male connector is used for being connected with a charging female socket and comprises a first CC terminal and a first VBUS terminal;
the USB Type-C male connector is used for connecting an external load and comprises a second CC terminal;
the first control circuit comprises a selection circuit, a first switch circuit and a second switch circuit, the first switch circuit is connected in series between the first CC terminal and the second CC terminal, one end of the second switch circuit is connected with the second CC terminal, the other end of the second switch circuit is electrically connected with the first VBUS terminal through a circuit, the selection circuit is respectively and electrically connected with the first CC terminal, the first switch circuit and the second switch circuit, and is used for respectively controlling the working states of the first switch circuit and the second switch circuit according to an electric signal of the first CC terminal so as to respectively control the connection states of the first CC terminal and the second CC terminal and the connection states of the first VBUS terminal and the second CC terminal.
2. The charging cable of claim 1, wherein when the first and second CC terminals are in a connected state and the first and second VBUS terminals are in a disconnected state, the USBType-A male connector and the USBType-C male connector are in a first charging mode, and when the first and second CC terminals are in a disconnected state and the first and second VBUS terminals are in a connected state, the USBType-A male connector and the USBType-C male connector are in a second charging mode.
3. The charging cable of claim 2, wherein the first control circuit further comprises a voltage conversion circuit electrically connected to the first VBUS terminal and the second switching circuit, respectively, for converting the voltage provided by the first VBUS terminal when in the second charging mode.
4. The charging cable according to claim 3, wherein the first control circuit further comprises a voltage dividing circuit electrically connected to the voltage converting circuit and the second switching circuit, respectively, for dividing the voltage output by the voltage converting circuit when in the second charging mode.
5. The charging cable according to claim 4, wherein the first switching circuit comprises a first MOS switching tube, the second switching circuit comprises a second MOS switching tube, a control end of the first MOS switching tube and a control end of the second MOS switching tube are both connected with the selection circuit, an input end of the first MOS switching tube is connected with the first CC terminal, an output end of the first MOS switching tube is connected with the second CC terminal, an input end of the second MOS switching tube is connected with the voltage dividing circuit terminal, and an output end of the second MOS switching tube is connected with the second CC terminal.
6. The charging cable according to claim 5, wherein the selection circuit comprises a comparator, a non-inverting input terminal of the comparator is electrically connected to the first CC terminal and the input terminal of the first MOS switch tube, respectively, an inverting input terminal of the comparator is used for inputting a reference voltage, and an output terminal of the comparator is connected to the control terminal of the first MOS switch tube and the control terminal of the second MOS switch tube, respectively.
7. The charging cable according to claim 6, wherein the selection circuit comprises an inverter, an input end of the inverter is respectively connected with an output end of the comparator and a control end of the first MOS switch tube, and an output end of the inverter is connected with a control end of the second MOS switch tube.
8. The charging cable of claim 4, wherein the voltage divider circuit comprises a pull-up resistor connected in series between the voltage conversion circuit output terminal and the second switch circuit for pulling up the second CC terminal to the output of the voltage conversion circuit when in the second charging mode.
9. The charging cable according to claim 4, wherein the voltage dividing circuit comprises a constant current source connected in series between the voltage converting circuit and the second switching circuit for providing a constant current when in the second charging mode.
10. The charging cable according to any one of claims 1 to 9, further comprising a fault protection circuit electrically connected to the selection circuit for detecting faults of the USB Type-a male connector, the USB Type-C male connector and the charging cable, wherein the selection circuit controls the first switching circuit to be turned off when a specific fault occurs.
11. A charging device, comprising:
the charging female seat is used for being electrically connected with an external power supply; and the charging cable according to any one of claims 1 to 10, for electrically connecting the charging female socket and the external load, respectively.
12. A charging cable protection system, comprising:
the USB plug comprises a first USB Type-C male head, a second USB Type-C male head and a third CC terminal, wherein the first USB Type-C male head comprises the third CC terminal;
a second USB Type-C male connector, the second USB Type-C male connector comprising a fourth CC terminal;
and the second control circuit comprises a fault detection circuit, a third switch circuit and a control unit, the third switch circuit is respectively connected with the third CC terminal and the fourth CC terminal, and the control unit is respectively and electrically connected with the fault detection circuit and the third switch circuit.
13. The charge cord protection system of claim 12, wherein the third switch circuit is in a default conductive state.
14. The charging cable protection system of claim 12, wherein the third CC terminal and the fourth CC terminal are both configured channels of the USB Type-C male connector.
CN202010285396.4A 2020-04-13 2020-04-13 Charging cable, charging device and charging cable protection system Active CN111525349B (en)

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