Overvoltage protection circuit of electronic equipment interface and electronic equipment

Abstract

The utility model provides an overvoltage protection circuit of an electronic device interface and an electronic device wherein the circuit comprises a protection unit, a first end of the protection unit is connected with a first end of a charging protocol chip, a second end of the protection unit is connected with a first end of a configuration channel CC pin, and a second end of the CC pin is connected with an external device; wherein the charging protocol chip and the external equipment are independent of the overvoltage protection circuit; the voltage detection unit is connected with the protection unit and is used for detecting the magnitude of the voltage provided by the external equipment and outputting a detection signal; wherein the protection unit is used for connecting or disconnecting a circuit between the charging protocol chip and the CC pin according to the detection signal.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technologies, and in particular, to an overvoltage protection circuit for an electronic device interface and an electronic device. Background Art

[0002] Generally, when a notebook or an adaptor is inserted into a machine, a general notebook communicates with the device or the adaptor through the signal of the configuration channel (CC). However, if the communication between the other device or adaptor and the CC signal is normal, but the power supply is poor (continuously providing 20V), it is possible that a high voltage (20V) is supplied when the device or adaptor is inserted. And when the CC signal communication is completed, although the device or adaptor agrees to provide the required power (5V) or stop supplying power, due to the poor power supply, a high voltage (20V) is still supplied into the system. At this time, the system has opened the low-voltage channel (5V) after communication, so that the external high voltage flows into the system low-voltage channel and causes component burnout. For example, after communicating through the CC signal, the power controller (PC) should provide 5V voltage to the device through the power delivery (PD) chip. However, if the device is abnormal and inputs 20V voltage to charge the notebook computer, the 20V voltage will be transmitted to the PC through the wrong path through the PD, causing damage to the PD and the PC. Summary of the Invention

[0003] The present disclosure provides an overvoltage protection circuit for an electronic device interface and an electronic device to at least solve the above technical problems existing in the prior art.

[0004] According to a first aspect of the present disclosure, there is provided an overvoltage protection circuit for an electronic device interface, the circuit including:

[0005] A protection unit, a first end of the protection unit is connected to a first end of a charging protocol chip, a second end of the protection unit is connected to a first end of a configuration channel CC pin, and a second end of the CC pin is connected to an external device; wherein, the charging protocol chip and the external device are independent of the overvoltage protection circuit;

[0006] A voltage detection unit, connected to the protection unit, for detecting the magnitude of the voltage provided by the external device and outputting a detection signal; wherein,

[0007] The protection unit is configured to conduct or disconnect a line between the charging protocol chip and the CC pin according to the detection signal.

[0008] In one implementable manner, the protection unit is specifically configured to:

[0009] Before the charging protocol chip communicates with the external device through the CC pin, if the voltage detection unit detects that the voltage provided by the external device is greater than the first preset voltage, the line between the charging protocol chip and the CC pin is disconnected to turn off the CC pin; if the voltage detection unit detects that the voltage provided by the external device is less than the first preset voltage, the line between the charging protocol chip and the CC pin is conducted to enable the charging protocol chip to communicate with the external device through the CC pin.

[0010] In one implementable manner, the protection circuit includes a first MOS transistor and a second MOS transistor. The first MOS transistor is connected to the charging protocol chip, and the second MOS transistor is connected to the CC pin;

[0011] The first preset voltage is equal to the gate voltage of the second MOS transistor.

[0012] In one implementable manner, the range of the first preset voltage is 5.5V to 8V.

[0013] In one implementable manner, disconnecting the line between the charging protocol chip and the CC pin includes: turning on the second MOS transistor to disconnect the line;

[0014] Conducting the line between the charging protocol chip and the CC pin includes: turning off the second MOS transistor to conduct the line.

[0015] In one implementable manner, the gate of the first MOS transistor is connected to the charging protocol chip, the source of the first MOS transistor is grounded, the drain of the first MOS transistor and the gate of the second MOS transistor are both connected to the voltage detection unit, the drain of the second MOS transistor is connected to the CC pin, and the source of the second MOS transistor is grounded.

[0016] In one implementable manner, when the charging protocol chip communicates with the external device through the CC pin, the voltage at the control end of the charging protocol chip is pulled high to turn off the second MOS transistor, and the external device provides voltage to the charging protocol chip.

[0017] In one implementable manner, the line between the charging protocol chip and the CC pin includes a first voltage channel and a second voltage channel. Among them, the voltage threshold passed by the first voltage channel is less than the first preset voltage, and the voltage threshold passed by the second voltage channel is greater than the first preset voltage.

[0018] In one implementable manner, when the charging protocol chip communicates with the external device through the CC pin, if the external device provides a first voltage less than the first preset voltage, the power supply controller turns on the first voltage channel, and the first voltage is transmitted to the charging protocol chip through the first voltage channel; if the external device provides a second voltage greater than the first preset voltage, the power supply controller turns on the second voltage channel, and the second voltage is transmitted to the charging protocol chip through the second voltage channel; wherein, the power supply controller is connected to the second end of the charging protocol chip and is independent of the overvoltage protection circuit.

[0019] According to a second aspect of the present disclosure, there is provided an electronic device, including:

[0020] A charging protocol chip, a power supply controller, and the overvoltage protection circuit according to any one of the above embodiments; wherein, the first end of the charging protocol chip is connected to the overvoltage protection circuit, and the second end is connected to the power supply controller

[0021] The overvoltage protection circuit and the electronic device of the electronic device interface of the present disclosure, by adding a protection unit between the charging protocol chip and the CC pin, the protection unit disconnects or conducts the line between the charging protocol chip and the CC pin according to the magnitude of the voltage provided by the external device, so as to ensure that when the power supply of the external device is poor and the provided voltage is greater than the voltage that the line can bear, the overall line is disconnected to avoid high-voltage power from flowing into the low-voltage channel and causing device burnout.

[0022] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become easily understood. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, wherein:

[0024] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0025] Figure 1 is a structural block diagram of the electronic device provided by the present disclosure;

[0026] Figure 2 is a circuit diagram of the overvoltage protection circuit of the electronic device interface provided by the present disclosure;

[0027] Figure 3 is a detailed working flowchart of the overvoltage protection circuit. Detailed implementation manners

[0028] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present disclosure.

[0029] The embodiment of the present disclosure provides an overvoltage protection circuit for an electronic device interface. Figure 1 It is a structural block diagram of an electronic device provided by the present disclosure. Figure 2 It is a circuit diagram of an overvoltage protection circuit for an electronic device interface provided by the present disclosure.

[0030] As Figure 1 and Figure 2 shown, the overvoltage protection circuit includes:

[0031] A protection unit 10, the first end of the protection unit 10 is connected to the first end of a charging protocol chip 20, the second end of the protection unit 10 is connected to the first end of a configuration channel CC pin, and the second end of the CC pin is connected to an external device 30; wherein, the charging protocol chip 20 and the external device 30 are independent of the overvoltage protection circuit;

[0032] A voltage detection unit 40, connected to the protection unit 10, for detecting the magnitude of the voltage provided by the external device 30 and outputting a detection signal; wherein,

[0033] The protection unit 10 is configured to conduct or disconnect the line between the charging protocol chip 20 and the CC pin according to the detection signal.

[0034] In this embodiment, the charging protocol chip may be disposed in an electronic device (such as a computer, a mobile phone, a tablet, etc.), the electronic device interface may be a Type-C interface, and the Type-C interface is connected to the charging protocol chip through the CC pin, and the CC pin is used to transmit communication signals. The Type-C interface can access an external device. After the external device is accessed, the charging protocol chip can communicate with the external device. During the communication process, it may be that the charging protocol chip provides voltage to the external device, or the external device provides voltage to the charging protocol chip. In this embodiment, the process of the external device providing voltage to the charging protocol chip is mainly described.

[0035] One end of the protection unit 10 is connected to the charging protocol chip 20, and the other end is connected to the CC pin. When the protection unit 10 is turned off, the line between the charging protocol chip 20 and the CC pin is conducting. When the protection unit 10 is disconnected, the line between the charging protocol chip 20 and the CC pin is disconnected.

[0036] In one embodiment, as Figure 2 shown, the protection circuit 10 includes a first MOS transistor Q1 and a second MOS transistor Q2. The first MOS transistor Q1 is connected to the charging protocol chip 20 (PD_GIPO), and the second MOS transistor Q2 is connected to the CC pin (CC_CONN).

[0037] The gate G of the first MOS transistor Q1 is connected to the charging protocol chip 20. The source S of the first MOS transistor Q1 is grounded. The drain D of the first MOS transistor Q1 and the gate G of the second MOS transistor Q2 are both connected to the voltage detection unit 40 (VBUS_CONN). The drain D of the second MOS transistor Q2 is connected to the CC pin, and the source S of the second MOS transistor Q2 is grounded.

[0038] The voltage detection unit 40, which is connected to the protection unit 10, is used to detect the magnitude of the voltage provided by the external device 30 and output a detection signal. When the voltage detection unit detects that the voltage provided by the external device exceeds the first preset voltage, it sends a disconnection control signal to the protection unit 10.

[0039] In one embodiment, as Figure 2 shown, a resistor R1 is provided between the voltage detection unit 40 and the protection unit 10.

[0040] In one embodiment, the protection unit 10 is specifically configured to: before the charging protocol chip 20 communicates with the external device 30 through the CC pin, if the voltage detection unit 40 detects that the voltage provided by the external device 30 is greater than the first preset voltage, disconnect the line between the charging protocol chip 20 and the CC pin to turn off the CC pin; if the voltage detection unit 40 detects that the voltage provided by the external device 30 is less than the first preset voltage, conduct the line between the charging protocol chip 20 and the CC pin to enable the charging protocol chip 20 to communicate with the external device 30 through the CC pin.

[0041] When an external device is connected to the interface of an electronic device but the charging protocol chip 20 has not yet communicated with the external device 30, the external device may provide a voltage greater than the voltage channel currently opened by the electronic device, resulting in damage to the electronic device. In the embodiments of the present disclosure, by adding a protection unit between the charging protocol chip and the CC pin, the protection unit disconnects or conducts the line between the charging protocol chip and the CC pin according to the magnitude of the voltage provided by the external device, so as to ensure that when the power supply of the external device is poor and the provided voltage is greater than the voltage that the line can bear, the overall line is disconnected to prevent high-voltage power from flowing into the low-voltage channel and causing device burnout.

[0042] Specifically, for example, if the voltage channel currently opened by the electronic device is a low-voltage channel, when the voltage provided by the external device 30 is greater than the first preset voltage, it indicates that the voltage provided by the external device 30 may be greater than the threshold voltage that the low-voltage channel can withstand. At this time, the protection unit 10 disconnects the line between the charging protocol chip 20 and the CC pin, so that the voltage provided by the external device 30 cannot enter the low-voltage channel and prevent device burnout; if the voltage provided by the external device 30 is less than the first preset voltage, it means that the voltage provided by the external device 30 is within the threshold voltage range that the low-voltage channel can withstand, then the protection unit 10 is turned off to enable normal communication between the charging protocol chip 20 and the external device 30.

[0043] In one embodiment, the first preset voltage is equal to the gate voltage of the second MOS transistor Q2.

[0044] In one embodiment, the range of the first preset voltage is 5.5V to 8V. If the first preset voltage is too large, although the voltage provided by the external device is less than the first preset voltage, it may still be greater than the threshold voltage of the low-voltage channel, resulting in device burnout; if the first preset voltage is too small, although the voltage provided by the external device is greater than the first preset voltage, it may still be within the threshold range of the low-voltage channel, but at this time, because the line is closed, the external device cannot communicate normally with the charging protocol chip.

[0045] The gate voltage of the first MOS transistor Q1 is 1V.

[0046] In one embodiment, disconnecting the line between the charging protocol chip 20 and the CC pin includes: turning on the second MOS transistor Q2 to disconnect the line;

[0047] Conducting the line between the charging protocol chip 20 and the CC pin includes: turning off the second MOS transistor Q2 to conduct the line.

[0048] When it is confirmed that the voltage provided by the external device 30 is less than the first preset voltage, the charging protocol chip 20 communicates with the external device 30 normally; when it is confirmed that the voltage provided by the external device is greater than the first preset voltage, the low-voltage channel in the circuit is changed to a high-voltage channel to enable the charging protocol chip 20 to communicate with the external device 30 normally.

[0049] In an embodiment, when the charging protocol chip 20 communicates with the external device 30 through the CC pin, the voltage at the control end of the charging protocol chip 20 is pulled high to turn off the second MOS transistor Q2, and the external device 30 provides voltage to the charging protocol chip 20.

[0050] When the charging protocol chip 20 can communicate with the external device 30 through the CC pin normally, it is necessary to turn off the second MOS transistor Q2 to make the circuit between the charging protocol chip 20 and the CC pin conductive.

[0051] In an embodiment, the circuit between the charging protocol chip 20 and the CC pin includes a first voltage channel and a second voltage channel, wherein the voltage threshold passed by the first voltage channel is less than the first preset voltage, and the voltage threshold passed by the second voltage channel is greater than the first preset voltage.

[0052] Specifically, the first voltage channel is a low-voltage channel, and the second voltage channel is a high-voltage channel.

[0053] In an embodiment, when the charging protocol chip 20 communicates with the external device 30 through the CC pin, if the external device 30 provides a first voltage less than the first preset voltage, the power supply controller 50 turns on the first voltage channel, and the first voltage is transmitted to the charging protocol chip 20 through the first voltage channel; if the external device 30 provides a second voltage greater than the first preset voltage, the power supply controller 50 turns on the second voltage channel, and the second voltage is transmitted to the charging protocol chip 20 through the second voltage channel; wherein, the power supply controller 50 is connected to the second end of the charging protocol chip 20 and is independent of the overvoltage protection circuit.

[0054] Figure 3 It is a detailed working flowchart of the overvoltage protection circuit.

[0055] In a specific embodiment, as Figure 3 shown, when the charging protocol chip communicates with the external device through the CC pin, the power supply controller can provide an output voltage of 5V, which is transmitted to the external device through the charging protocol chip and the CC pin. This process will not cause damage to the device, so it will not be described in detail.

[0056] When the charging protocol chip communicates with an external device through the CC pin, it can also be that the external device provides an input voltage of 5V or 20V. During this process, if the voltage provided by the external device is less than the first preset voltage, for example, 5V, it means that the voltage provided by the external device is within the threshold voltage range that the low-voltage channel can withstand. At this time, the voltage at the control end of the charging protocol chip is pulled high to turn off the second MOS transistor, the circuit is turned on, and the 5V input voltage is transmitted to the charging unit through the CC pin and the protection unit; if the voltage provided by the external device is greater than the first preset voltage, for example, 20V, it means that the voltage provided by the external device exceeds the threshold voltage range that the low-voltage channel can withstand. At this time, the high-voltage channel is turned on, and the voltage at the control end of the charging protocol chip is pulled high to turn off the second MOS transistor, the circuit is turned on, and the 20V input voltage is transmitted to the charging unit through the CC pin and the protection unit. It should be noted that at the same time, there is only one voltage transmission path in the circuit.

[0057] The embodiments of the present disclosure also provide an electronic device, which includes:

[0058] A charging protocol chip, a power controller, and an overvoltage protection circuit as described in any one of the above embodiments; wherein, the first end of the charging protocol chip is connected to the overvoltage protection circuit, and the second end is connected to the power controller.

[0059] The electronic device in the embodiments of the present application can be a terminal or other devices other than terminals. Exemplarily, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a handheld computer, a vehicle-mounted electronic device, a Mobile Internet Device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc., and can also be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present disclosure do not make specific limitations.

[0060] It should be understood that various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved. This is not limited herein.

[0061] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality of" means two or more unless otherwise specifically defined.

[0062] As described above, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An overvoltage protection circuit for an electronic device interface, characterized in that, The circuit includes: A protection unit, the first end of the protection unit is connected to the first end of the charging protocol chip, the second end of the protection unit is connected to the first end of the configuration channel CC pin, and the second end of the CC pin is connected to an external device; wherein, the charging protocol chip and the external device are independent of the overvoltage protection circuit; A voltage detection unit, connected to the protection unit, for detecting the magnitude of the voltage provided by the external device and outputting a detection signal; wherein, The protection unit is configured to conduct or disconnect the line between the charging protocol chip and the CC pin according to the detection signal.

2. The circuit according to claim 1, wherein The protection unit is specifically configured to: Before the charging protocol chip communicates with the external device through the CC pin, if the voltage detection unit detects that the voltage provided by the external device is greater than a first preset voltage, disconnect the line between the charging protocol chip and the CC pin to turn off the CC pin; if the voltage detection unit detects that the voltage provided by the external device is less than the first preset voltage, conduct the line between the charging protocol chip and the CC pin to enable the charging protocol chip to communicate with the external device through the CC pin.

3. The circuit according to claim 2, wherein The protection circuit includes a first MOS transistor and a second MOS transistor, the first MOS transistor is connected to the charging protocol chip, and the second MOS transistor is connected to the CC pin; The first preset voltage is equal to the gate voltage of the second MOS transistor.

4. The circuit according to claim 2 or 3, wherein The range of the first preset voltage is 5.5V to 8V.

5. The circuit according to claim 3, wherein Disconnecting the line between the charging protocol chip and the CC pin includes: turning on the second MOS transistor to disconnect the line; Conducting the line between the charging protocol chip and the CC pin includes: turning off the second MOS transistor to conduct the line.

6. The circuit according to claim 3, wherein The gate of the first MOS transistor is connected to the charging protocol chip, the source of the first MOS transistor is grounded, the drain of the first MOS transistor and the gate of the second MOS transistor are both connected to the voltage detection unit, the drain of the second MOS transistor is connected to the CC pin, and the source of the second MOS transistor is grounded.

7. The circuit according to claim 3, wherein When the charging protocol chip communicates with the external device through the CC pin, the voltage at the control terminal of the charging protocol chip is pulled high to turn off the second MOS transistor, and the external device provides voltage to the charging protocol chip.

8. The circuit according to claim 7, wherein The line between the charging protocol chip and the CC pin includes a first voltage channel and a second voltage channel, wherein the voltage threshold passed by the first voltage channel is less than the first preset voltage, and the voltage threshold passed by the second voltage channel is greater than the first preset voltage.

9. The circuit according to claim 8, wherein when the charging protocol chip communicates with the external device through the CC pin, if the external device provides a first voltage less than the first preset voltage, the power supply controller turns on the first voltage channel, and the first voltage is transmitted to the charging protocol chip through the first voltage channel; if the external device provides a second voltage greater than the first preset voltage, the power supply controller turns on the second voltage channel, and the second voltage is transmitted to the charging protocol chip through the second voltage channel; wherein, the power supply controller is connected to the second end of the charging protocol chip and is independent of the overvoltage protection circuit.

10. An electronic device, characterized in that, Comprising: a charging protocol chip, a power supply controller, and the overvoltage protection circuit according to any one of claims 1-9 above; wherein, the first end of the charging protocol chip is connected to the overvoltage protection circuit, and the second end is connected to the power supply controller.

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