CN117374672A - USB-C load safety access circuit and control method and equipment thereof - Google Patents
USB-C load safety access circuit and control method and equipment thereof Download PDFInfo
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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
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
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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
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6675—Structural association with built-in electrical component with built-in electronic circuit with built-in power supply
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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
- H01R13/70—Structural association with built-in electrical component with built-in switch
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Abstract
The invention relates to the technical field of electronic circuits, in particular to a USB-C load safety access circuit and a control method and equipment thereof, wherein the USB-C load safety access circuit comprises a load power supply module, a load access detection module, a switch module, a micro control module and a universal serial bus interface, and the switch module is arranged on a connecting line between the load power supply module and a configuration channel of the universal serial bus interface; the micro control module acquires a port state according to the port voltage signal acquired by the load access detection module, and when the port state is determined to be a real load access state, the micro control module controls the switch module to be switched to a closed state and generates a power supply on command so that the load power supply module supplies power for the accessed real load. According to the invention, the safety access of the USB-C load is realized through the switch module and the load access detection module, the risk of damaging or burning down the subordinate equipment of the USB-C interface is reduced, the safety and stability of the equipment are improved, and the power consumption and the cost of the whole circuit are lower.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a USB-C load security access circuit, and a control method and apparatus thereof.
Background
With development of technology, the USB interface has become a main interface for data transmission and power supply between electronic devices, and the USB-C interface is gradually becoming a main stream interface in the market due to its double-sided insertion design, higher data transmission rate and larger power transmission capability, wherein the USB-C interface is an USB Type-C interface, however, with the improvement of the power transmission capability, a higher requirement is also put on load security access control of the USB-C interface.
The safe access of the traditional USB-C interface is mainly based on the principles of current overload protection, circuit thermal protection and the like, the complex application environment is ignored, the waterproof USB Type-C interface cannot be strictly realized, and the traditional USB-C interface has no waterproof function, so under the condition of lacking other protection mechanisms, the traditional USB-C interface is easily affected by moisture, the problems of abnormal protocol handshake, wrong output voltage or damage to subordinate equipment and the like are caused, meanwhile, the interface is damaged due to the electrolysis effect caused by the existence of the power supply voltage, the USB-C interface cannot be reused, and the safety and the adaptability of the USB-C interface are to be improved, particularly for equipment needing frequent plugging and unplugging, such as: mobile devices, tablet computers, etc., there is a need to provide a more reliable and safer USB-C interface load secure access circuit.
Disclosure of Invention
The invention provides a USB-C load safety access circuit, a control method and equipment thereof, and solves the technical problems that a traditional USB-C interface does not have a waterproof function, a complex application environment is ignored, and the USB-C load safety access circuit is easily influenced by moisture, so that protocol handshake is abnormal, wrong voltage is output or lower equipment is damaged and the like.
In order to solve the technical problems, the invention provides a USB-C load safety access circuit, a control method and control equipment thereof.
In a first aspect, the present invention provides a USB-C load secure access circuit, the circuit comprising: the device comprises a load power supply module, a load access detection module, a switch module, a micro control module and a universal serial bus interface, wherein the micro control module is electrically connected with a protocol unit of the load power supply module and the load access detection module; the switch module is arranged on a connecting line between the load power supply module and a configuration channel of the universal serial bus interface;
the load access detection module is used for collecting port voltage signals of a configuration channel and a power supply voltage signal line in the universal serial bus interface in real time when the switch module is in a default disconnection state;
The micro control module is used for acquiring a port state according to the received port voltage signal, generating a switch switching instruction when determining that the port state is a real load access state, enabling the switch module to be switched into a closed state according to the switch switching instruction, and generating a power supply connection instruction;
and in the process of supplying power to a real load through the load power supply module, after detecting that the load is removed according to the working state of the protocol unit read in real time, controlling the switch module to be switched into a default disconnection state so as to disconnect the protocol unit from the universal serial bus interface;
and the load power supply module is used for responding to the power supply on instruction and supplying power to the accessed real load.
In a further embodiment, the port state is obtained according to the received port voltage signal, specifically:
detecting port voltage signals of the configuration channel and the power supply voltage signal line according to a preset voltage threshold value to obtain a detection result, and acquiring a port state corresponding to the port voltage signal according to the detection result, wherein if the detection result is that the port voltage signal of the configuration channel is within a preset channel water inlet voltage threshold value range and the port voltage signal of the power supply voltage signal line is within a preset power supply water inlet voltage threshold value range, judging that the port state is a water inlet state;
And if the detection result shows that the port voltage signal of the configuration channel meets the requirement of the preset channel load voltage threshold value and the port voltage signal of the power supply voltage signal line is zero, judging that the port state is a real load access state.
In a further embodiment, the switch module comprises at least an analog electronic switch, which is in an off state by default;
the load access detection module comprises a first voltage acquisition unit and a second voltage acquisition unit, wherein the first voltage acquisition unit is connected with a power supply voltage signal line of the universal serial bus interface, and the second voltage acquisition unit is connected with a configuration channel of the universal serial bus interface;
the first voltage acquisition unit comprises a first resistor and a second resistor which are connected in series, a first voltage signal acquisition end is arranged between the first resistor and the second resistor, so that port voltage signals of a power supply voltage signal line are acquired through the first voltage signal acquisition end, and the port voltage signals of the power supply voltage signal line are sent to the micro control module;
the second voltage acquisition unit comprises a pull-up circuit and a voltage acquisition circuit connected with the pull-up circuit, so that the voltage acquisition circuit is used for acquiring port voltage signals of the configuration channel and sending the port voltage signals of the configuration channel to the micro control module, wherein the voltage acquisition circuit is a first voltage signal acquisition circuit or a second voltage signal acquisition circuit.
In a further embodiment, the configuration channels of the universal serial bus interface include a first configuration channel and a second configuration channel, the pull-up circuit includes an auxiliary power supply, a third resistor, a first anti-reflection diode, and a second anti-reflection diode, the first anti-reflection diode and the second anti-reflection diode being connected in parallel;
the auxiliary power supply is connected to the common ends of anodes of the first anti-reflection diode and the second anti-reflection diode through the third resistor, a cathode of the first anti-reflection diode is connected between the switch module and the first configuration channel, and a cathode of the second anti-reflection diode is connected between the switch module and the second configuration channel.
In a further embodiment, the first voltage signal acquisition circuit comprises a fourth resistor, a first capacitor and a second voltage signal acquisition terminal;
the second voltage signal acquisition end is connected to the common end of the anode of the first anti-reflection diode and the anode of the second anti-reflection diode through the fourth resistor so as to acquire the port voltage signal of the configuration channel through the second voltage signal acquisition end, and the auxiliary power supply, the third resistor, the first anti-reflection diode and the second anti-reflection diode are utilized to provide pull-up for the configuration channel of the universal serial bus interface;
One end of the first capacitor is connected to the common end of the second voltage signal acquisition end and the fourth resistor R3, and the other end of the first capacitor is grounded.
In a further embodiment, when the voltage acquisition circuit is a first voltage signal acquisition circuit, the preset channel load voltage threshold is:
wherein V is Load Representing a channel load voltage threshold; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R a A pull-down resistor generated by real load access is represented; r is R 7 A resistance value representing the third resistance;
the range of the water inlet voltage threshold of the preset channel isThe preset power supply water inlet voltage threshold range is 0-V Water and its preparation method ；
Wherein,
in the method, in the process of the invention,representing the upper limit value of the preset channel water inlet voltage threshold range; v (V) Water and its preparation method Representing the upper limit value of the preset power supply water inlet voltage threshold range; r is R 1 A resistance value representing the first resistance; r is R 2 The resistance value of the second resistor is shown.
In a further embodiment, the second voltage signal acquisition circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third voltage signal acquisition terminal and a fourth voltage signal acquisition terminal, so as to acquire the port voltage signals of the first configuration channel and the second configuration channel through the third voltage signal acquisition terminal and the fourth voltage signal acquisition terminal respectively, and provide bias voltages for the configuration channels of the universal serial bus interface by using an auxiliary power supply, the third resistor, the first anti-reflection diode and the second anti-reflection diode;
The cathode of the first anti-reflection diode is grounded through the fifth resistor and the sixth resistor which are connected in series, and the third voltage signal acquisition end is connected between the fifth resistor and the sixth resistor;
the cathode of the second anti-reflection diode is grounded through the seventh resistor and the eighth resistor which are connected in series, and the fourth voltage signal acquisition end is connected between the seventh resistor and the eighth resistor.
In a further embodiment, when the voltage acquisition circuit is a second voltage signal acquisition circuit, the preset channel load voltage threshold includes a first safe no-load voltage threshold of the first configuration channel in a no-water-in and no-real-load access state and a second safe no-load voltage threshold of the second configuration channel in a no-water-in and no-real-load access state, the preset channel water inlet voltage threshold range includes a water inlet voltage threshold range of the first configuration channel and a water inlet voltage threshold range of the second configuration channel, and the first safe no-load voltage threshold is:
the second safe no-load voltage threshold is:
in the formula, vload' cc1 Representing a first safe no-load voltage threshold corresponding to the first configuration channel; vload' cc2 Representing a second safe no-load voltage threshold corresponding to the second configuration channel; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R 6 A resistance value representing a sixth resistance; r is R 5 A resistance value representing the fifth resistance; r is R 7 A resistance value representing the third resistance; r is R 8 A resistance value representing the eighth resistance; r is R 4 A resistance value representing a seventh resistance;
the range of the water inlet voltage threshold value of the first configuration channel isThe threshold range of the water inlet voltage of the second configuration channel is +.>The threshold value range of the water inlet voltage of the preset power supply is 0-V' Water and its preparation method ；
Wherein,
in the method, in the process of the invention,representing the upper limit value of the water inlet voltage threshold range of the first configuration channel; />Representing the upper limit value of the water inlet voltage threshold range of the second configuration channel; r is R Water and its preparation method Representing the water equivalent resistance.
In a second aspect, the present invention provides a control method for a USB-C load security access circuit, to which the above USB-C load security access circuit is applied, the method including the steps of:
when the connection between a protocol unit and a configuration channel of a universal serial bus interface is disconnected by default, acquiring port voltage signals of the configuration channel and a power supply voltage signal line in the universal serial bus interface in real time;
Acquiring a port state according to the received port voltage signal, and generating a switch switching instruction when the port state is determined to be a real load access state;
closing the connection between the protocol unit and the configuration channel of the universal serial bus interface according to the switch switching instruction, and generating a power supply switching instruction;
responding to the power supply on instruction, supplying power to the accessed real load, and reading the working state of the protocol unit in real time in the process of supplying power to the real load;
and after detecting that the load is removed according to the working state of the protocol unit, controlling to disconnect the connection between the protocol unit and the configuration channel of the universal serial bus interface.
In a third aspect, the present invention provides an electronic device comprising a USB-C load secure access circuit as described above.
The invention provides a USB-C load safety access circuit and a control method and equipment thereof, wherein the circuit comprises a load power supply module, a load access detection module, a switch module, a micro control module and a universal serial bus interface, wherein the load access detection module is used for collecting port voltage signals of a configuration channel and a power supply voltage signal line in the universal serial bus interface; the micro control module is used for detecting the port voltage signal, obtaining a port state corresponding to the port voltage signal, and generating a switch switching instruction when the port state is determined to be a real load access state so as to control an analog electronic switch in the switch module to disconnect a configuration channel of the universal serial bus interface. Compared with the prior art, the circuit realizes automatic identification of water inlet or load access of the USB-C port through the load access detection module and the analog electronic switch, reduces the risk of damaging or burning down the subordinate equipment of the port, realizes safe power supply to the load, and improves the safety and adaptability of the equipment.
Drawings
FIG. 1 is a USB-C load security access circuit diagram provided by an embodiment of the invention;
fig. 2 is a schematic diagram of definition of internal pins of a Type-C interface according to an embodiment of the present invention;
FIG. 3 is a diagram of a specific example of a USB-C load security access circuit based on a first voltage signal acquisition circuit according to an embodiment of the present invention;
FIG. 4 is a flowchart of one implementation of a USB-C load security access circuit provided by an embodiment of the present invention;
FIG. 5 is a diagram of a USB-C load security access circuit based on a second voltage signal acquisition circuit according to an embodiment of the present invention;
FIG. 6 is a flowchart of another implementation of a USB-C load security access circuit provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of a control method of a USB-C load security access circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a USB-C load security access circuit, which can be applied to all products with USB Type-C interfaces, as shown in fig. 1, and includes: the device comprises a load power supply module 11, a load access detection module 12, a switch module 13, a micro control module 14 and a universal serial bus interface 15, wherein the micro control module is electrically connected with a protocol unit of the load power supply module and the load access detection module; the switch module is arranged on a connecting line between the load power supply module and the configuration channel of the universal serial bus interface, and at least comprises an analog electronic switch which is in an off state by default.
In general, the principle of external power supply of the Type-C interface is as follows: when the Type-C interface is not connected with a load, the first configuration channel CC1 pin or the first configuration channel CC2 pin does not have protocol communication, the internal circuit is closed for output, and the VBUS pin has no voltage; when the Type-C interface is connected to a load, the first configuration channel CC1 pin or the first configuration channel CC2 pin has protocol communication, which indicates that the load is normal, the Type-C interface starts outputting according to the protocol, the VBUS pin has voltage, as shown in fig. 2, in the USB-C interface, the VBUS pin is adjacent to the CC pin (the configuration channel, configuration Channel, the CC pin includes the CC1 pin and the CC2 pin), when the USB-C interface is subjected to water or is affected by moisture, the adjacent pins are easily connected and conductive due to the moisture, so that abnormal functions or interface damage is caused, therefore, in the embodiment, by adding an analog electronic switch on the CC pin, the CC signal is disconnected, and meanwhile, by a method of measuring the voltage of the VBUS pin, the CC1 pin and the CC2 pin at the interface end, whether the load is safely connected to the USB-C interface is judged, that is due to the moisture or the real load is judged to be inserted, and finally, the load is safely powered.
Specifically, in fig. 1, in the embodiment, an analog electronic switch is designed to be connected in series on a communication bus of a CC1 pin and a CC2 pin in the USB-C interface, the default state of the analog electronic switch is controlled to be in an off state, that is, a Type-C protocol IC opens a handshake protocol, meanwhile, due to the difference between an equivalent resistance of a water loop and a pull-down resistance on a real load CC line, whether the CC pin is affected by moisture or is connected to a real load can be distinguished from the difference, therefore, in the embodiment, a load access detection module 12 is added on the CC1/CC2 line of the USB-C interface, whether a voltage is present on the VBUS pin is measured under the condition that no output is performed to determine whether the water is present or not, if the USB-C interface is not affected by moisture is detected, and the analog electronic switch is closed after the load is normal, a protocol unit of the load power supply module is normally handshaked with a subordinate equipment, and power supply is outputted, in the power supply output, after the working state of the protocol unit is continuously read by the MCU, the load removal state is controlled, in which the analog electronic switch of the CC pin is opened is controlled, wherein the DC-DC pin is measured, that means that a Feedback DC-DC voltage is obtained by a DC-DC controller is used for controlling a DC voltage and a DC voltage is regulated; type-C protocol represents Type-C interface protocol.
The load access detection module 12 is configured to collect, in real time, port voltage signals of a configuration channel and a power supply voltage signal line in the universal serial bus interface when the switch module is in a default off state, and send the port voltage signals to the micro control module 14, where in this embodiment, the load access detection module includes a first voltage collection unit and a second voltage collection unit, the first voltage collection unit is connected to a VBUS pin of the power supply voltage signal line of the universal serial bus interface, and the second voltage collection unit is connected to a CC pin of the configuration channel of the universal serial bus interface.
The first voltage acquisition unit comprises a first resistor R1 and a second resistor R2 which are connected in series, a first voltage signal acquisition end ADC1 is arranged between the first resistor R1 and the second resistor R2, so that port voltage signals of a power supply voltage signal line are acquired through the first voltage signal acquisition end ADC1, and the port voltage signals of the power supply voltage signal line are sent to the micro control module.
The second voltage collecting unit includes a pull-up circuit and a voltage collecting circuit connected to the pull-up circuit, so as to collect a port voltage signal of the configuration channel CC pin by the voltage collecting circuit and send the port voltage signal of the configuration channel CC pin to the micro control module 14, where the voltage collecting circuit is a first voltage signal collecting circuit or a second voltage signal collecting circuit, in this embodiment, the configuration channel CC pin of the universal serial bus interface includes a first configuration channel CC1 pin and a second configuration channel CC2 pin, the pull-up circuit includes an auxiliary power VCC, a third resistor R7, a first anti-reverse diode D1 and a second anti-reverse diode D2, the first anti-reverse diode D1 and the second anti-reverse diode D2 are connected in parallel, the auxiliary power source is connected to a common anode end of the first anti-reverse diode D1 and the second anti-reverse diode D2 by the third resistor R7, the first anti-reverse diode D1 is connected between the first anti-reverse diode CC1 and the second anti-reverse diode CC2, and the first anti-reverse diode CC1 is connected to the second anti-reverse diode CC2 pin between the first anti-reverse diode CC module and the second anti-reverse diode CC 2.
In a specific embodiment, as shown in fig. 3, the first voltage signal collecting circuit includes a fourth resistor R3, a first capacitor C1, and a second voltage signal collecting terminal ADC2, where the second voltage signal collecting terminal is connected to a common terminal of the first anti-reflection diode D1 and the anode of the second anti-reflection diode D2 through the fourth resistor R3, so as to collect a port voltage signal of the configuration channel through the second voltage signal collecting terminal, and provide a pull-up for the configuration channel of the universal serial bus interface by using an auxiliary power VCC, a third resistor R7, the first anti-reflection diode D1, and the second anti-reflection diode D2; one end of the first capacitor C1 is connected to the common end of the second voltage signal acquisition end and the fourth resistor R3, and the other end of the first capacitor C1 is grounded.
In another specific embodiment, as shown in fig. 5, the second voltage signal acquisition circuit includes a fifth resistor (R5-R5), a sixth resistor (R6-R6), a seventh resistor (R4-R4), an eighth resistor (R3-R8), a third voltage signal acquisition terminal (ADC 2-ADC 3) and a fourth voltage signal acquisition terminal (ADC 3-ADC 4) to acquire the port voltage signals of the first configuration channel CC1 and the second configuration channel CC2 through the third voltage signal acquisition terminal (ADC 2-ADC 3) and the fourth voltage signal acquisition terminal (ADC 3-ADC 4), respectively, and provide bias voltages for the configuration channels of the universal serial bus interface by using an auxiliary power supply VCC, a third resistor R7, a first anti-reflection diode D1 and a second anti-reflection diode D2; in this embodiment, the cathode of the first anti-reflection diode D1 is grounded through the fifth resistor and the sixth resistor connected in series, and the third voltage signal acquisition terminal is connected between the fifth resistor and the sixth resistor; the cathode of the second anti-reflection diode D2 is grounded through the seventh resistor and the eighth resistor which are connected in series, and the fourth voltage signal acquisition end is connected between the seventh resistor and the eighth resistor.
The micro-control module 14 is configured to obtain a port state according to the received port voltage signal, and generate a switch switching instruction when determining that the port state is a real load access state, so that the switch module switches to a closed state according to the switch switching instruction, and generates a power supply on instruction; and the micro-control module 14 is further configured to read, in real time, a working state of a protocol unit in a process of supplying power to a real load according to a power supply on command by the load power supply module, and control the switch module to switch to a default off state after detecting removal of the load according to the working state of the protocol unit; the method comprises the steps of obtaining a port state according to the received port voltage signal, specifically:
detecting port voltage signals of the configuration channel and the power supply voltage signal line according to a preset voltage threshold value to obtain a detection result, and acquiring a port state corresponding to the port voltage signal according to the detection result, wherein if the detection result is that the port voltage signal of the configuration channel is within a preset channel water inlet voltage threshold value range and the port voltage signal of the power supply voltage signal line is within a preset power supply water inlet voltage threshold value range, judging that the port state is a water inlet state; and if the detection result shows that the port voltage signal of the configuration channel meets the requirement of the preset channel load voltage threshold value and the port voltage signal of the power supply voltage signal line is zero, judging that the port state is a real load access state.
In a specific embodiment, when the voltage acquisition circuit is a first voltage signal acquisition circuit, the preset channel water inlet voltage threshold range isThe preset power supply water inlet voltage threshold range is 0-V Water and its preparation method The preset channel load voltage threshold is Vload, wherein the preset channel load voltage threshold V Load Upper limit value of preset channel water inlet voltage threshold value +.>Presetting the upper limit value V of the threshold range of the water inlet voltage of the power supply Water and its preparation method The calculation formulas of (a) are respectively as follows:
wherein V is Load Representing a channel load voltage threshold; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R a A pull-down resistor generated by real load access is represented; r is R 7 A resistance value representing the third resistance;representing the upper limit value of the preset channel water inlet voltage threshold range; v (V) Water and its preparation method Representing the upper limit value of the preset power supply water inlet voltage threshold range; r is R 1 A resistance value representing the first resistance R1; r is R 2 The resistance value of the second resistor R2 is shown.
Specifically, in fig. 3, in this embodiment, an analog electronic Switch K1 is connected in series to a connection line of a pin of a configuration channel CC, where the analog electronic Switch K1 is configured to disconnect a protocol unit IC of a USB-C from a connection between a configuration channel of a universal serial bus interface (the configuration channel CC pin of a Type-C interface), so as to avoid interference of a pull-up resistor in the protocol unit IC with water detection, in this embodiment, an auxiliary power VCC, a third resistor R7 and anti-reflection diodes D1 and D2 are used to provide pull-up for the configuration channel CC pin of the Type-C interface, in this embodiment, the auxiliary power VCC preferably uses a 5V dc power supply, the third resistor R7 preferably uses 499K ohms, and the anti-reflection diodes D1 and D2 preferably use 1N4148 Type diodes.
Meanwhile, in the embodiment, the cathode voltages of the anti-reflection diodes D1 and D2 are collected through the second voltage signal collection end ADC2, the cathode voltages of the anti-reflection diodes D1 and D2 are approximately equal to the voltage (+ 0.7V) of the pins of the configuration channel CC, so that the lowest voltage in the pins of the configuration channel CC can be indirectly collected, the pins of the two configuration channels CC can be pulled up in a no-load connection state, the voltage value collected by the second voltage signal collection end ADC2 is the auxiliary power supply VCC voltage, and the voltage collected by the first voltage signal collection end ADC1 is 0; when a real load is accessed, one pin of the CC1 pin or the CC2 pin is accessed to a pull-down resistor with the amplitude of 5.1 Kohm, so that the second voltage signal acquisition end ADC2 can read a constant voltage Vload, the constant voltage Vload is preferentially used as a channel load voltage threshold value, and the voltage acquired by the first voltage signal acquisition end ADC1 is 0V; when water is fed or affected by moisture rather than a real load is fed, the configuration channel CC pin is connected to the VBUS pin or the power supply negative electrode through water, and the water resistance is generally larger than the pull-down resistance of 5.1K of the real load due to the small space of the Type-C interface, at the moment,the voltage value of the second voltage signal acquisition end ADC2 is a certain voltage value between Vload and (VCC-0.7V), and meanwhile, after the configuration channel CC pin is connected with the VBUS pin through water, the voltage acquired by the first voltage signal acquisition end ADC1 can be detected to be no longer 0, and the acquired voltage value is larger than 0V and smaller than the upper limit value V of the water inlet voltage threshold range of the preset power supply Water and its preparation method 。
Therefore, as shown in fig. 4, according to the voltage values collected by the first voltage signal collecting terminal ADC1 and the second voltage signal collecting terminal ADC2, the embodiment may determine whether the Type-C interface is in a water inlet state or a real load is connected, and if so, keep the analog electronic Switch K1 in an off state until normal recovery; if the real load is detected to be accessed, closing the analog electronic Switch K1, enabling the USB-C protocol unit IC to be in normal handshake communication with the load, and finally supplying power to the load through the load power supply module, wherein in the process of supplying power to the load, the micro control module MCU detects the load state in real time, when the load is detected to be removed, immediately switching off the analog electronic Switch K1, and restarting water inflow and real load access detection.
In another specific embodiment, when the voltage acquisition circuit is a second voltage signal acquisition circuit, the preset channel load voltage threshold includes a first safe no-load voltage threshold of the first configuration channel in a no-water and no-real-load access state and a second safe no-load voltage threshold of the second configuration channel in a no-water and no-real-load access state, the preset channel water inlet voltage threshold range includes a water inlet voltage threshold range of the first configuration channel and a water inlet voltage threshold range of the second configuration channel, and the water inlet voltage threshold range of the first configuration channel is The threshold range of the water inlet voltage of the second configuration channel is +.>The threshold value range of the water inlet voltage of the preset power supply is 0-V' Water and its preparation method The first safe no-load powerThe pressure threshold is Vload' cc1 The calculation formula of the first safe no-load voltage threshold value is as follows:
the second safe no-load voltage threshold is:
the CC1 line voltage V cc1 The calculation formula is as follows:
in this embodiment,// represents parallel, R Water and its preparation method //(R 5 +R 6 ) R represents Water and its preparation method R5 and R6 connected in parallel are larger in value, and the water inlet resistor R Water and its preparation method Far smaller than R5, R6, CC1 line voltage V cc1 About equal to the following formula:
at this time, the upper limit value of the water inlet voltage threshold range of the first configuration channelThe calculation formula is as follows:
CC2 line voltage V cc2 The calculation formula is as follows:
because the resistor R3 and the resistor R4 take larger values, the water inlet resistor R Water and its preparation method Far smaller than the voltages V of R3, R4 and CC2 lines cc2 About equal to the following formula:
at this time, the upper limit value of the water inlet voltage threshold range of the second configuration channelThe calculation formula is as follows:
in the resistance R4, the resistance R6 and the resistance R8 are far smaller than the resistance R Water and its preparation method Under the conditions of the resistor R1 and the resistor R2, the upper limit value V 'of the threshold range of the water inlet voltage of the preset power supply' Water and its preparation method The calculation formula is as follows:
in the formula, vload' cc1 Representing a first safe no-load voltage threshold corresponding to the first configuration channel; vload' cc2 Representing a second safe no-load voltage threshold corresponding to the second configuration channel; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R 6 A resistance value representing a sixth resistance R6; r is R 5 A resistance value representing the fifth resistance R5; r is R 7 A resistance value representing the third resistance; r is R 8 A resistance value representing an eighth resistance R8; r is R 4 A resistance value representing a seventh resistance R4; r is R Water and its preparation method Representing the water equivalent resistance.
Specifically, in fig. 5, the embodiment strings an analog electronic Switch K1 on the configuration channel CC pin connection line, the analog electronic Switch K1 being used for the protocol unit IC of the USB-C and the universal serial bus interfaceThe auxiliary power supply VCC, the current limiting resistor R7 and the anti-reflection diodes D1 and D2 are adopted to provide bias voltage for the configuration channel CC pin of the Type-C interface, in the embodiment, the auxiliary power supply VCC preferably adopts a 5V direct current power supply, and the anti-reflection diodes D1 and D2 preferably adopt 1N4148 Type diodes, thereby V f Has a value of about 0.7V, R Water and its preparation method It should be noted that, because the Type-C connection line has a corresponding matching resistance, this may overlap with the water equivalent resistance, but because of the influence of the lower device protocol chip and the circuit, there is a dynamic change process at the access moment, and this embodiment can be judged and distinguished by software.
Different from the first voltage signal acquisition circuit, the second voltage signal acquisition circuit in the embodiment adopts R1/R2, R8/R4 and R5/R6 to form a conventional voltage division acquisition circuit to respectively acquire the voltages of a power supply voltage signal line VBUS pin, a first configuration channel CC1 pin and a second configuration channel CC2 pin; in this embodiment, as shown in fig. 6, when no real load is connected, the analog electronic Switch K1 is switched off by default, so that the lines between the pins CC1 and CC2 of the first configuration channel and the protocol unit are disconnected, at this time, the protocol unit IC does not supply power to the outside, the VBUS pin does not output, the MCU automatically scans the voltages of the ADC1/ADC2/ADC4 to detect the voltages of the pins CC and VBUS, determines whether the voltage of the pins VBUS is equal to or not, if the voltage of the pin VBUS is not equal to 0, the Type-C interface is considered to be in, if the voltage of the pin VBUS is not equal to 0, the voltage value of the pin CC of the configuration channel is detected, if the voltage value of the pin CC of the configuration channel is equal to (VCC-Vf), if the voltage value of the pin CC of the configuration channel is not equal to (VCC-Vf), the port voltage signal of the power supply voltage signal line acquired by the ADC1 at the first voltage signal acquisition end is zero, and the port voltage signal of the second voltage signal end ADC2 and the third voltage signal end ADC3 meet the preset load-C requirement, and the Type-C interface is determined to be connected to be normal; if the port voltage signals of the power supply voltage signal lines acquired by the first voltage signal acquisition end ADC1 are in a preset power supply water inlet voltage threshold range, and the port voltage signals of the configuration channels acquired by the second voltage signal acquisition end ADC2 and the third voltage signal acquisition end ADC3 are in a preset channel water inlet voltage threshold range, the Type-C interface water inlet is described; if the Type-C interface is in water, the analog electronic Switch K1 is kept closed; under the condition of no real load access, the analog electronic Switch K1 is kept closed; if water is not fed and the load is normal, switching on an analog electronic Switch K1 to Switch on a protocol unit, so that the Type-C interface works normally; it should be noted that, in this embodiment, when it is determined that the voltage value of the configuration channel CC pin is not equal to (VCC-Vf), it is also required to determine whether the voltage value fluctuation of the configuration channel CC pin is greater than a preset deviation range, so as to avoid erroneous determination due to voltage fluctuation and improve accuracy of interface detection.
The load power supply module 11 is configured to respond to the power supply on command and supply power to the accessed real load, where the load power supply module includes a dc-dc power supply unit, a protocol unit, and a transistor (MOS transistor) Q1; the protocol unit is used for normally handshaking with the subordinate equipment when the analog electronic Switch K1 on the configuration channel CC pin is closed.
The embodiment of the invention provides a USB-C load safety access circuit, which comprises a load power supply module, a load access detection module, a switch module, a micro control module and a universal serial bus interface, wherein the switch module is arranged on a connecting line between the load power supply module and a configuration channel of the universal serial bus interface; the micro control module is used for acquiring the port state according to the port voltage signal acquired by the load access detection module, generating a switch switching instruction when the port state is determined to be the real load access state, enabling the switch module to be switched to the closed state according to the switch switching instruction, generating a power supply on instruction, and supplying power to the real load through the load power supply module. Compared with the prior art, the method provided by the embodiment can not only realize water inlet detection of the USB interface, but also prevent damage to equipment caused by overcurrent, overvoltage and the like through the design of the analog electronic switch and the load access detection module, and realize a load control and protection mechanism, so that the equipment can adapt to various complex application scenes, the safety and stability of the equipment are improved, and the power consumption and hardware cost of the whole circuit are lower.
In one embodiment, as shown in fig. 7, an embodiment of the present invention provides a control method of a USB-C load security access circuit, and the method includes the following steps:
s1, when a default disconnection protocol unit is connected with a configuration channel of a universal serial bus interface, acquiring port voltage signals of the configuration channel and a power supply voltage signal line in the universal serial bus interface in real time;
s2, acquiring a port state according to the received port voltage signal, and generating a switch switching instruction when the port state is determined to be a real load access state;
s3, closing the connection between the protocol unit and the configuration channel of the universal serial bus interface according to the switch switching instruction, and generating a power supply switching-on instruction;
s4, responding to the power supply connection instruction, supplying power to the accessed real load, and reading the working state of the protocol unit in real time in the process of supplying power to the real load;
s5, after the load removal is detected according to the working state of the protocol unit, the connection between the protocol unit and the configuration channel of the universal serial bus interface is controlled to be disconnected.
It should be noted that, the sequence number of each process does not mean that the execution sequence of each process is determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
For a specific limitation of a control method of the USB-C load security access circuit, reference may be made to the above limitation of the control method of the USB-C load security access circuit, and the description thereof will not be repeated here. Those of ordinary skill in the art will appreciate that the various modules and steps described in connection with the embodiments disclosed herein may be implemented as hardware, software, or a combination of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The embodiment of the invention provides a control method of a USB-C load safety access circuit, which comprises the steps of acquiring a port state according to port voltage signals of a configuration channel and a power supply voltage signal line in a universal serial bus interface acquired in real time when a default disconnection protocol unit is connected with the configuration channel of the universal serial bus interface, and generating a switch switching instruction when the port state is determined to be a real load access state; closing the connection between the protocol unit and the configuration channel of the universal serial bus interface according to the switch switching instruction, and generating a power supply switching instruction; responding to a power supply on instruction, supplying power to an accessed real load, and reading the working state of a protocol unit in real time in the process of supplying power to the real load; and after detecting that the load is removed according to the working state of the protocol unit, controlling to disconnect the connection between the protocol unit and the configuration channel of the universal serial bus interface. By adopting the method of the embodiment, the problems that the traditional USB-C interface does not have a waterproof function, a complex application environment is ignored, the influence of moisture is easily received, protocol handshake is abnormal, wrong voltage is output or lower equipment is damaged are solved, and the problem that the USB interface is damaged due to electrification of the USB-C equipment caused by water inflow or other external environment factors is effectively solved.
Fig. 8 is an electronic device 201 according to an embodiment of the present invention, including the above-mentioned USB-C load security access circuit 202.
According to the USB-C load safety access circuit, the analog electronic switch and the load access detection module are used for measuring the level of the CC pin of the configuration channel of the Type-C interface, the on-off of the CC pin of the configuration channel is controlled, the problem that the USB-C interface is damaged due to electrification caused by water inflow or other external environment factors is avoided, the risk that the Type-C interface is damaged or burns down subordinate equipment is reduced, the safe access of the Type-C interface to the real load is realized, the service cycle of products is prolonged, meanwhile, the circuit design structure is simple, and the volume and cost of the equipment are reduced.
The foregoing examples represent only a few preferred embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the invention. It should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and substitutions should also be considered to be within the scope of the present application. Therefore, the protection scope of the patent application is subject to the protection scope of the claims.
Claims (10)
1. A USB-C load secure access circuit, comprising: the device comprises a load power supply module, a load access detection module, a switch module, a micro control module and a universal serial bus interface, wherein the micro control module is electrically connected with a protocol unit of the load power supply module and the load access detection module; the switch module is arranged on a connecting line between the load power supply module and a configuration channel of the universal serial bus interface;
the load access detection module is used for collecting port voltage signals of a configuration channel and a power supply voltage signal line in the universal serial bus interface in real time when the switch module is in a default disconnection state;
the micro control module is used for acquiring a port state according to the received port voltage signal, generating a switch switching instruction when determining that the port state is a real load access state, enabling the switch module to be switched into a closed state according to the switch switching instruction, and generating a power supply connection instruction;
and in the process of supplying power to a real load through the load power supply module, after detecting that the load is removed according to the working state of the protocol unit read in real time, controlling the switch module to be switched into a default disconnection state so as to disconnect the protocol unit from the universal serial bus interface;
And the load power supply module is used for responding to the power supply on instruction and supplying power to the accessed real load.
2. The USB-C load security access circuit of claim 1, wherein the port state is obtained according to the received port voltage signal, specifically:
detecting port voltage signals of the configuration channel and the power supply voltage signal line according to a preset voltage threshold value to obtain a detection result, and acquiring a port state corresponding to the port voltage signal according to the detection result, wherein if the detection result is that the port voltage signal of the configuration channel is within a preset channel water inlet voltage threshold value range and the port voltage signal of the power supply voltage signal line is within a preset power supply water inlet voltage threshold value range, judging that the port state is a water inlet state;
and if the detection result shows that the port voltage signal of the configuration channel meets the requirement of the preset channel load voltage threshold value and the port voltage signal of the power supply voltage signal line is zero, judging that the port state is a real load access state.
3. A USB-C load security access circuit as defined in claim 2 wherein: the switch module at least comprises an analog electronic switch which is in an off state by default;
The load access detection module comprises a first voltage acquisition unit and a second voltage acquisition unit, wherein the first voltage acquisition unit is connected with a power supply voltage signal line of the universal serial bus interface, and the second voltage acquisition unit is connected with a configuration channel of the universal serial bus interface;
the first voltage acquisition unit comprises a first resistor and a second resistor which are connected in series, a first voltage signal acquisition end is arranged between the first resistor and the second resistor, so that port voltage signals of a power supply voltage signal line are acquired through the first voltage signal acquisition end, and the port voltage signals of the power supply voltage signal line are sent to the micro control module;
the second voltage acquisition unit comprises a pull-up circuit and a voltage acquisition circuit connected with the pull-up circuit, so that the voltage acquisition circuit is used for acquiring port voltage signals of the configuration channel and sending the port voltage signals of the configuration channel to the micro control module, wherein the voltage acquisition circuit is a first voltage signal acquisition circuit or a second voltage signal acquisition circuit.
4. A USB-C load security access circuit as claimed in claim 3, wherein: the configuration channel of the universal serial bus interface comprises a first configuration channel and a second configuration channel, the pull-up circuit comprises an auxiliary power supply, a third resistor, a first anti-reflection diode and a second anti-reflection diode, and the first anti-reflection diode and the second anti-reflection diode are connected in parallel;
The auxiliary power supply is connected to the common ends of anodes of the first anti-reflection diode and the second anti-reflection diode through the third resistor, a cathode of the first anti-reflection diode is connected between the switch module and the first configuration channel, and a cathode of the second anti-reflection diode is connected between the switch module and the second configuration channel.
5. The USB-C load security access circuit of claim 4, wherein: the first voltage signal acquisition circuit comprises a fourth resistor, a first capacitor and a second voltage signal acquisition end;
the second voltage signal acquisition end is connected to the common end of the anode of the first anti-reflection diode and the anode of the second anti-reflection diode through the fourth resistor so as to acquire the port voltage signal of the configuration channel through the second voltage signal acquisition end, and the auxiliary power supply, the third resistor, the first anti-reflection diode and the second anti-reflection diode are utilized to provide pull-up for the configuration channel of the universal serial bus interface;
one end of the first capacitor is connected to the common end of the second voltage signal acquisition end and the fourth resistor R3, and the other end of the first capacitor is grounded.
6. The USB-C load safety access circuit of claim 5, wherein when the voltage acquisition circuit is a first voltage signal acquisition circuit, the preset channel load voltage threshold is:
wherein V is Load Representing a channel load voltage threshold; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R a A pull-down resistor generated by real load access is represented; r is R 7 A resistance value representing the third resistance;
the range of the water inlet voltage threshold of the preset channel isThe preset power supply water inlet voltage threshold range is 0-V Water and its preparation method ；
Wherein,
in the method, in the process of the invention,representing the upper limit value of the preset channel water inlet voltage threshold range; v (V) Water and its preparation method Representing the upper limit value of the preset power supply water inlet voltage threshold range; r is R 1 A resistance value representing the first resistance; r is R 2 The resistance value of the second resistor is shown.
7. The USB-C load security access circuit of claim 4, wherein: the second voltage signal acquisition circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third voltage signal acquisition end and a fourth voltage signal acquisition end, so that port voltage signals of the first configuration channel and the second configuration channel are acquired through the third voltage signal acquisition end and the fourth voltage signal acquisition end respectively, and bias voltages are provided for the configuration channels of the universal serial bus interface by using an auxiliary power supply, the third resistor, the first anti-reflection diode and the second anti-reflection diode;
The cathode of the first anti-reflection diode is grounded through the fifth resistor and the sixth resistor which are connected in series, and the third voltage signal acquisition end is connected between the fifth resistor and the sixth resistor;
the cathode of the second anti-reflection diode is grounded through the seventh resistor and the eighth resistor which are connected in series, and the fourth voltage signal acquisition end is connected between the seventh resistor and the eighth resistor.
8. The USB-C load safety access circuit of claim 7, wherein when the voltage acquisition circuit is a second voltage signal acquisition circuit, the preset channel load voltage threshold comprises a first safe no-load voltage threshold of a first configuration channel when in a no-water-in and no-real-load access state and a second safe no-load voltage threshold of a second configuration channel when in a no-water-in and no-real-load access state, the preset channel water-in voltage threshold range comprises a water-in voltage threshold range of the first configuration channel and a water-in voltage threshold range of the second configuration channel, the first safe no-load voltage threshold is:
the second safe no-load voltage threshold is:
in the formula, vload' cc1 Representing a first safe no-load voltage threshold corresponding to the first configuration channel; vload' cc2 Representing a second safe no-load voltage threshold corresponding to the second configuration channel; VCC represents the voltage value of the auxiliary power supply; v (V) f Representing the forward turn-on voltage value of the anti-reverse diode; r is R 6 A resistance value representing a sixth resistance; r is R 5 A resistance value representing the fifth resistance; r is R 7 A resistance value representing the third resistance; r is R 8 A resistance value representing the eighth resistance; r is R 4 A resistance value representing a seventh resistance;
the range of the water inlet voltage threshold value of the first configuration channel isThe threshold range of the water inlet voltage of the second configuration channel is +.>The threshold value range of the water inlet voltage of the preset power supply is 0-V' Water and its preparation method ；
Wherein,
in the method, in the process of the invention,representing the upper limit value of the water inlet voltage threshold range of the first configuration channel; />Representing the upper limit value of the water inlet voltage threshold range of the second configuration channel; r is R Water and its preparation method Representing the water equivalent resistance.
9. A method of controlling a USB-C load security access circuit, wherein the USB-C load security access circuit of any one of claims 1 to 8 is applied, the method comprising the steps of:
when the connection between a protocol unit and a configuration channel of a universal serial bus interface is disconnected by default, acquiring port voltage signals of the configuration channel and a power supply voltage signal line in the universal serial bus interface in real time;
Acquiring a port state according to the received port voltage signal, and generating a switch switching instruction when the port state is determined to be a real load access state;
closing the connection between the protocol unit and the configuration channel of the universal serial bus interface according to the switch switching instruction, and generating a power supply switching instruction;
responding to the power supply on instruction, supplying power to the accessed real load, and reading the working state of the protocol unit in real time in the process of supplying power to the real load;
and after detecting that the load is removed according to the working state of the protocol unit, controlling to disconnect the connection between the protocol unit and the configuration channel of the universal serial bus interface.
10. An electronic device, characterized in that: a USB-C load security access circuit comprising any one of claims 1-8.
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| CN117849597A (en) * | 2024-03-08 | 2024-04-09 | 荣耀终端有限公司 | Circuit board testing device |
| CN117849597B (en) * | 2024-03-08 | 2024-07-09 | 荣耀终端有限公司 | Circuit board testing device |
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| CN117849597A (en) * | 2024-03-08 | 2024-04-09 | 荣耀终端有限公司 | Circuit board testing device |
| CN117849597B (en) * | 2024-03-08 | 2024-07-09 | 荣耀终端有限公司 | Circuit board testing device |
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