A cable over-temperature protection circuit

Abstract

The application provides a cable over-temperature protection circuit, which comprises a voltage stabilizing power supply module, a first switch module and a control module, and a communication filtering module and a third switch module; a VBUS port of a first cable plug provides voltage for the first switch module and the control module through the voltage stabilizing power supply module; the first switch module is further connected with a CC port of the first cable plug; two ends of the communication filtering module are respectively connected with ground and the CC port of the first cable plug, two ends of the third switch module are respectively connected with DP and DM ports of the first cable plug, and the control module controls the working state of the first switch module, the communication filtering module and the third switch module according to the cable temperature to control the power supply equipment to charge the powered equipment in a normal charging mode or a fast charging mode, so that the circuit can avoid the phenomenon of VBUS popping during over-temperature protection and prolong the service life of the port.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering, and in particular to a cable over-temperature protection circuit. Background Technology

[0002] Currently, the power of Universal Serial Bus (USB) fast charging has reached 240W. For cables, ultra-high safety performance is required. If the power is not cut off in time when the temperature is too high, there is a risk of cable damage due to high temperature, and it may even cause a fire.

[0003] In traditional cable over-temperature protection designs, two integrated temperature protection E-Marker chips are usually placed in the Universal Serial Bus Type-C interface cable (USB Type-C cable). When the cable temperature is too high, the E-Marker chip or the power supply is switched. During the over-temperature protection period, the power bus port will hiccup, causing the device to be in an alternating state of being powered on and off, which shortens the life of the device port. Summary of the Invention

[0004] This invention provides a cable over-temperature protection circuit that can solve the problem of shortened device port life in existing designs by constructing an improved cable over-temperature protection circuit.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a cable over-temperature protection circuit, comprising a regulated power supply module, a first switching module, and a control module;

[0006] The voltage regulator module has an input terminal for connecting to the power bus port of the first cable plug, and an output terminal for connecting to the power bus port of the control module.

[0007] The first switch module has a first end for connecting to the configuration channel port of the first cable plug, a second end for connecting to the output end of the regulated power supply module, and a controlled end for connecting to the first control end of the control module.

[0008] The control module has a temperature monitoring port for receiving temperature signals about the cable; wherein, the control module is used to control the first switch module via the first control terminal based on the temperature signals.

[0009] The circuit further includes a communication filtering module, the first end of which is used to connect to the configuration channel port of the first cable plug, the second end of which is used to ground, and the controlled end of which is connected to the second control terminal of the control module. The control module is also used to control the communication filtering module through the second control terminal according to the temperature signal; and / or, the circuit further includes a third switch module, the first end of which is used to connect to the positive data signal port of the first cable plug, the second end of which is used to connect to the negative data signal port of the first cable plug, and the controlled end of which is connected to the third control terminal of the control module. The control module is also used to control the third switch module through the third control terminal.

[0010] Compared to existing technologies, the beneficial effects of this invention are as follows: This invention provides a cable over-temperature protection circuit, comprising a regulated power supply module, a first switching module, and a control module. The circuit further includes a communication filtering module and / or a third switching module. The temperature monitoring port of the control module is used to receive temperature signals related to the cable. The input terminal of the regulated power supply module is connected to the power bus port of the first cable plug, and its output terminal is connected to the power bus port of the control module and the second terminal of the first switching module, respectively. The first cable plug supplies power to the control module through the regulated power supply module. The first terminal of the first switching module is connected to the configuration channel port of the first cable plug, and its controlled terminal is connected to the first control terminal of the control module. The control module controls the opening and closing of the first switching module based on the temperature signal, thereby affecting the signal of the configuration channel port. This allows the power supply device to determine whether to supply power to the powered device by detecting the signal of the configuration channel port. The first terminal of the communication filtering module is connected to the configuration channel port of the first cable plug, and its second terminal is grounded. Its controlled terminal is connected to the second control terminal of the control module. The control module controls the operation of the communication filtering module based on the temperature signal, thereby controlling whether the power supply device and the powered device can communicate based on the Universal Serial Bus Power Transfer Protocol (USB Power). The invention utilizes a cable over-temperature protection circuit comprising a voltage regulator module, a first switch module, a control module, a communication filter module, and / or a third switch module. The first end of the third switch module connects to the positive data signal port of the first cable plug, and the second end connects to the negative data signal port of the first cable plug. Its controlled end connects to the third control end of the control module. The control module controls the opening and closing of the third switch module based on a temperature signal, causing the negative data signal port and the positive data signal port to short-circuit or disconnect. This controls whether the power supply device and the powered device can communicate via a fast charging protocol based on data signal line voltage. Therefore, this embodiment of the invention constructs a cable over-temperature protection circuit including a voltage regulator module, a first switch module, a control module, a communication filter module, and / or a third switch module. The control module controls the first switch module and the working state of the communication filter module and / or the third switch module based on a temperature signal, thereby controlling whether the power supply device charges the powered device in normal charging or fast charging mode. This circuit avoids hiccups at the power bus port during over-temperature protection, extending the lifespan of the device ports. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a cable over-temperature protection circuit provided in a preferred embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of a cable over-temperature protection circuit provided in a preferred embodiment of the present invention;

[0013] Figure 3This is a schematic diagram of a cable over-temperature protection circuit provided in a preferred embodiment of the present invention;

[0014] Figure 4 This is a schematic diagram of a cable over-temperature protection circuit provided in a preferred embodiment of the present invention;

[0015] Among them: 10, control module; 20, communication filtering module; LDO, regulated power supply module; CC, configuration channel port; VBUS, power bus port; DP, data positive signal port; DM, data negative signal port; GND, ground terminal; RNTC, thermistor; S1, first switch module; S2, second switch module; S3, third switch module; PLUG-A, first cable plug; PLUG-B, second cable plug. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] A preferred embodiment of the present invention provides a cable over-temperature protection circuit, including a regulated power supply module, a first switching module, and a control module;

[0018] The voltage regulator module has an input terminal for connecting to the power bus port of the first cable plug, and an output terminal for connecting to the power bus port of the control module.

[0019] The first switch module has a first end for connecting to the configuration channel port of the first cable plug, a second end for connecting to the output end of the regulated power supply module, and a controlled end for connecting to the first control end of the control module.

[0020] The control module has a temperature monitoring port for receiving temperature signals about the cable; wherein, the control module is used to control the first switch module via the first control terminal based on the temperature signals.

[0021] The circuit further includes a communication filtering module, the first end of which is used to connect to the configuration channel port of the first cable plug, the second end of which is used to ground, and the controlled end of which is connected to the second control terminal of the control module. The control module is also used to control the communication filtering module through the second control terminal according to the temperature signal; and / or, the circuit further includes a third switch module, the first end of which is used to connect to the positive data signal port of the first cable plug, the second end of which is used to connect to the negative data signal port of the first cable plug, and the controlled end of which is connected to the third control terminal of the control module. The control module is also used to control the third switch module through the third control terminal.

[0022] It's worth noting that for the Universal Serial Bus (USB) Type-C interface, the essential pins include the Power Bus (VBUS) port, the Ground (GND) port, and the Configuration Channel (CC) port. VBUS is used for auxiliary charging, GND is used for grounding, and CC is used to identify the device role (master / slave), negotiate power parameters (such as USB Power Delivery (PD)), and detect connection status. Optional pins include the USB Data Positive (DP) port and the USB Data Minus (DM) port, which can be used for devices compatible with non-PD fast charging protocols. For example, some fast charging protocols (such as Qualcomm Quick Charge and MediaTek Pump Express) rely on voltage communication on the DP / DM lines (e.g., negotiating charging parameters via the voltage combination of D+ / D-), therefore the DP / DM pins need to be retained.

[0023] Specifically, taking the example of the first cable plug being a power supply device and the second cable plug being a power receiving device, the first cable plug PLUG-A supplies power to the second cable plug PLUG-B through the power bus port.

[0024] 1. Please see Figure 1The cable over-temperature protection circuit shown assumes that the charging modes between the power supply and the receiving device include normal charging, PD-based fast charging, and D+ and D- type fast charging. The circuit includes a voltage regulator module (LDO), a first switch module (S1), a control module (10), a communication filter module (20), and a third switch module (S3). The working principle of the cable over-temperature protection circuit is as follows: the temperature monitoring port of the control module (10) is connected to a thermistor (RNTC) to monitor the cable temperature. The control module (10) determines whether the cable temperature has exceeded the required level based on the acquired temperature signal. Normally, based on the cable temperature, control signals are sent to the controlled ends of the first switch module S1, the communication filter module 20, and the third switch module S3 via the first, second, and third control terminals to control the states of the first switch module S1, the communication filter module 20, and the third switch module S3. This allows the power supply equipment to supply power to the powered device based on the PD fast charging protocol or the D+ and D- type fast charging protocols when the cable temperature is normal. When the cable temperature is abnormal, the power supply equipment supplies power to the powered device in normal charging mode to reduce the cable temperature.

[0025] 2. Please see Figure 2 The cable over-temperature protection circuit shown assumes that the charging modes between the power supply equipment and the powered equipment include normal charging and PD-based fast charging. The circuit includes a voltage regulator module (LDO), a first switch module (S1), a control module (10), and a communication filter module (20). The working principle of the cable over-temperature protection circuit is as follows: The control module (10) determines whether the cable temperature is normal based on the acquired temperature signal. Based on the cable temperature, it sends control signals to the controlled ends of the first switch module (S1) and the communication filter module (20) through the first and second control terminals, controlling the states of the first switch module (S1) and the communication filter module (20). This allows the power supply equipment to supply power to the powered equipment based on the PD fast charging protocol when the cable temperature is normal, and to supply power to the powered equipment in normal charging mode when the cable temperature is abnormal, thereby reducing the cable temperature.

[0026] 3. Please see Figure 3The cable over-temperature protection circuit shown includes a charging mode between the power supply device and the power receiving device, which includes normal charging and fast charging based on D+ and D- types. The cable over-temperature protection circuit includes a voltage regulator module LDO, a first switch module S1, a control module 10, and a third switch module S3. The working principle of the cable over-temperature protection circuit is as follows: the control module 10 determines whether the cable temperature is normal based on the acquired temperature signal of the cable. According to the cable temperature, it sends control signals to the controlled terminals of the first switch module S1 and the third switch module S3 through the first control terminal and the third control terminal, respectively, to control the state of the first switch module S1 and the third switch module S3. This allows the power supply device to supply power to the power receiving device based on the D+ and D- type fast charging protocol when the cable temperature is normal, and to supply power to the power receiving device in normal charging mode when the cable temperature is abnormal, so as to reduce the cable temperature.

[0027] Compared to existing technologies, this invention provides a cable over-temperature protection circuit, which includes a voltage regulator module LDO, a first switch module S1, and a control module 10. The circuit also includes a communication filtering module 20 and / or a third switch module S3. The temperature monitoring port of the control module 10 is used to receive temperature signals related to the cable. The input terminal of the voltage regulator module LDO is connected to the power bus port VBUS of the first cable plug PLUG-A, and its output terminal is connected to both the power bus port VBUS of the control module 10 and the second terminal of the first switch module S1, respectively. The first cable plug PLUG-A supplies power to the control module 10 through the voltage regulator module LDO. The first terminal of the first switch module S1 is used to connect to the first... The configuration channel port CC of the first cable plug PLUG-A is connected to the first control terminal of the control module 10. The control module 10 controls the opening and closing of the first switch module S1 based on the temperature signal, thereby affecting the signal of the configuration channel port CC. This allows the power supply equipment to determine whether to supply power to the powered device by detecting the signal of the configuration channel port CC. The first terminal of the communication filter module 20 is connected to the configuration channel port CC of the first cable plug PLUG-A, and the second terminal is grounded. The controlled terminal is connected to the second control terminal of the control module 10. The control module 10 controls the operation of the communication filter module 20 based on the temperature signal, thereby controlling whether the power supply equipment and the powered device can communicate based on the Universal Serial Bus Power Transfer Protocol (USB). Power Delivery (PD) fast charging; the first end of the third switch module S3 is used to connect to the positive data signal port DP of the first cable plug PLUG-A, and the second end is used to connect to the negative data signal port DM of the first cable plug PLUG-A. Its controlled end is connected to the third control end of the control module 10. The control module 10 controls the opening and closing of the third switch module S3 according to the temperature signal, so that the negative data signal port DM and the positive data signal port DP are short-circuited or disconnected, thereby controlling whether the power supply equipment and the power receiving equipment can communicate through the fast charging protocol based on data signal line voltage communication. Therefore, this embodiment of the invention constructs a cable over-temperature protection circuit including a voltage regulator module LDO, a first switch module S1, a control module 10, a communication filter module 20, and / or a third switch module S3. The control module 10 controls the first switch module S1 and the communication filter module 20 and / or the third switch module S3 according to the temperature signal, thereby controlling whether the power supply equipment charges the powered equipment in normal charging or fast charging mode. Using this circuit can avoid the hiccup phenomenon of the power bus port VBUS during the over-temperature protection period, thus extending the life of the device port.

[0028] In a preferred embodiment, the first switch module S1, the communication filtering module 20, and the third switch module S3 are controlled by the control module 10 in the following manner:

[0029] When the control module 10 is powered on, if it determines that the cable is overheated based on the temperature signal, it sends a disconnect signal to the controlled end of the first switch module S1 through the first control terminal to control the first switch module S1 to disconnect. It also sends closing signals to the controlled ends of the communication filter module 20 and the third switch module S3 through the second control terminal and the third control terminal, respectively, to control the communication filter module 20 to operate and the third switch module S3 to close.

[0030] Specifically, after power-on, the control module 10 first detects the cable temperature. If the control module 10 detects an abnormal cable temperature immediately after power-on, it controls the first switch module S1 to open. If the power supply device and the powered device can achieve fast charging based on the PD fast charging protocol, then the control module 10 also needs to control the communication filtering module 20 to work, filtering out PD communication on the CC line, so that the power supply device and the powered device cannot achieve fast charging based on the PD fast charging protocol. If the power supply device can supply power to the powered device based on the D+ and D- type fast charging protocols, then the control module 10 also needs to control the third switch module S3 to close, short-circuiting the data positive signal port DP and the data negative signal port DM, so that the D+ and D- type fast charging protocols cannot be performed, thus ensuring that the devices at both ends of the cable cannot perform fast charging. It is worth noting that if the devices fail to successfully communicate the fast charging protocol, the power supply device's power bus port VBUS will maintain a safe voltage output by default. The safe voltage is generally 5V, but it can also be 6V, 7V, etc., which is not limited here.

[0031] In a preferred embodiment, the first switch module S1, the communication filtering module 20, and the third switch module S3 are further controlled by the control module 10 in the following manner:

[0032] When the control module 10 is powered on, if it determines that the cable temperature is normal based on the temperature signal, it sends disconnect signals to the controlled terminals of the first switch module S1, the communication filter module 20, and the third switch module S3 through the first control terminal, the second control terminal, and the third control terminal, respectively, to control the first switch module S1 to disconnect, the communication filter module 20 to stop working, and the third switch module S3 to disconnect.

[0033] Specifically, after power-on, the control module 10 first detects the cable temperature. If the control module 10 detects that the cable temperature is normal immediately after power-on, it controls the first switch module S1 to open. If the power supply device and the powered device can achieve fast charging based on the PD fast charging protocol, then the control module 10 also needs to control the communication filter module 20 to not work, ensuring that there are no other accessory circuits on the CC line, thus ensuring the normal function of the cable and allowing the device to achieve high-power charging based on the PD fast charging protocol. If the power supply device can supply power to the powered device based on the D+ and D- type fast charging protocols, then the control module 10 also needs to control the third switch module S3 to open, ensuring the normal function of the cable and allowing the device to achieve high-power charging based on the D+ and D- type fast charging protocols.

[0034] In a preferred embodiment, the first switch module S1, the communication filtering module 20, and the third switch module S3 are further controlled by the control module 10 in the following manner:

[0035] When the control module 10 is powered on, it determines that the cable temperature is normal based on the temperature signal. However, as the working time progresses, it determines that the cable is overheated based on the temperature signal. It then sends a closing signal to the first switch module S1 through the first control terminal to control the first switch module S1 to close.

[0036] Specifically, if the control module 10 detects that the cable temperature is normal upon power-on, but becomes too high over time, it will close the first switch module S1. This causes the Type-C power supply device (Source end) connected via the cable to interpret this as the device being unplugged and shut down the VBUS power supply. When the VBUS power supply port is shut down, the control module 10 will lose power. Since the cable has not actually been unplugged, the Source end will supply the VBUS voltage to the control module 10 again. This is equivalent to a new power-on for the cable. During power-on, because the temperature cannot instantly drop to the recovery temperature point, it will be judged as an abnormal operating condition due to the temperature during power-on.

[0037] In a preferred embodiment, the first switch module S1, the communication filtering module 20, and the third switch module S3 are further controlled by the control module 10 in the following manner:

[0038] When the power is first applied, the control module 10 determines that the cable is overheating based on the temperature signal. However, as time goes on, it determines that the cable temperature has returned to normal based on the temperature signal. The control module 10 then sends a closing signal to the first switch module S1 through the first control terminal to control the first switch module S1 to close.

[0039] Specifically, if the control module 10 detects an excessively high temperature upon power-up, it will limit the power bus port VBUS to operate at a safe voltage (e.g., 5V). As time passes, the temperature will decrease to the recovery temperature point. At this point, the first switch module S1 will close, causing the Type-C Source terminal connected via cable to determine that the device has been unplugged and shut off the power supply to the power bus port VBUS. When the power bus port VBUS is shut off, the control module 10 will lose power. Since the cable has not actually been unplugged, the Source terminal will supply the power bus port VBUS voltage to the control module 10 again. This is equivalent to a new power-on for the cable. Since the temperature has decreased to the recovery temperature point upon power-on, it will be judged as a normal operating condition at power-on temperature.

[0040] In a preferred embodiment, the communication filtering module 20 includes a second switch module S2 and a capacitor C1. The first end of the second switch module S2 is used to connect to the configuration channel port CC of the first cable plug PLUG-A. The second end of the second switch module S2 is grounded through the capacitor C1. The controlled end of the second switch module S2 is connected to the first control end of the control module 10.

[0041] Furthermore, when the second switch module S2 is closed, the communication filtering module 20 is operational; when the second switch module S2 is open, the communication filtering module 20 is not operational.

[0042] Specifically, see Figure 4 The cable over-temperature protection circuit shown includes a communication filtering module 20 comprising a second switch module S2 and a capacitor C1. When the second switch module S2 is closed, it filters out PD communication on the CC line, preventing devices from achieving PD high-voltage, high-current charging based on the PD fast charging protocol. When the second switch module S2 is open, the communication filtering module 20 has no effect on PD communication on the CC line, allowing devices to achieve PD high-voltage, high-current charging based on the PD fast charging protocol.

[0043] Optionally, the second switching module S2 is an N-channel metal-oxide-semiconductor field-effect transistor. It is understood that the second switching module S2 can also be a transistor or a relay, etc., and is not limited thereto.

[0044] In a preferred embodiment, for any of the above embodiments, the first switching module S1 and the third switching module S3 are N-channel metal-oxide-semiconductor field-effect transistors. It is understood that the first switching module S1 and the third switching module S3 can also be transistors or relays, etc., and are not limited thereto.

[0045] In a preferred embodiment, for any of the above embodiments, when the third switch module S3 is closed or the communication filter module 20 is working, the power supply device supplies power to the powered device with a safe voltage through the first cable plug PLUG-A and the second cable plug PLUG-B. It is worth noting that when the communication filter module 20 is working, it filters out the PD signal on the CC line; when the communication filter module 20 is not working, it does not affect any signal on the CC line.

[0046] To make the working principle of the above-mentioned cable over-temperature protection circuit clearer, the structure and working logic of the circuit are described in detail below:

[0047] See Figure 4 The cable over-temperature protection circuit includes a first switch module, a second switch module, and a third switch module; a thermistor RNTC; a capacitor C1; a control module 10; and a regulated power supply module LDO. The cable plug configuration channel ports include a CC1 port and a CC2 port. In any embodiment of this invention, the first switch module and the communication filtering module are connected to the CC1 port.

[0048] The connection logic of this circuit is as follows:

[0049] 1. Connect one end of S1 to CC1 of the PLUG-A connector, connect the second end of S1 to the VCC network of the LDO output terminal VOUT, and connect the controlled end of S1 to the first control terminal C_S1 of the control module 10.

[0050] 2. Connect one end of S2 to CC1 of the PLUG-A connector, connect one end of capacitor C1 to the other end of capacitor C1, and connect the controlled end of S2 to the second control terminal C_S2 of control module 10.

[0051] 3. Connect one end of S3 to the DP of the PLUG-A connector, connect the second end of S3 to the DM of the PLUG-A connector, and connect the controlled end of S3 to the third control terminal C_S3 of the control module 10.

[0052] 4. One end of the thermistor RNTC is connected to the temperature monitoring port (NTC input terminal) of the control module 10, and the other end of RNTC is grounded;

[0053] 5. The input terminal VIN of the LDO is connected to the VBUS of the PLUG-A, the output terminal VOUT of the LDO is output to the VCC network, and the ground terminal GND of the LDO is grounded.

[0054] The operating logic of this circuit is as follows:

[0055] Switches S1, S2, and S3 are all composed of NMOS. After power-on, the control module 10 will first check the temperature. If the temperature is normal, it will disconnect S1, S2, and S3, ensuring that there are no auxiliary circuits on the cable CC1, DP, and DM, thus guaranteeing the normal function of the cable and allowing high-power charging. If the temperature is abnormal immediately after power-on, it will disconnect switch S1 and close switches S2 and S3, causing a large capacitor C1 to be connected in parallel to ground on the cable CC1 to filter out PD communication and short-circuit DP and DM, preventing other fast charging protocols based on DPDM from proceeding. This ensures that the devices at both ends of the cable maintain VBUS output at 5V (VBUS defaults to maintaining 5V output if fast charging protocol communication is not successful).

[0056] If the cable's temperature is normal upon power-on, but becomes too high over time, switch S1 will close, causing the Type-C Source terminal connected to the cable to interpret this as the device being unplugged and shut off VBUS power. When VBUS is off, the cable's control module 10 will lose power. However, since the cable is not actually unplugged, the Source terminal will re-supply VBUS voltage to the control module 10. This is equivalent to a new power-on for the cable. During this power-on, because the temperature cannot instantly drop to the recovery temperature, it will be interpreted as an abnormal temperature condition.

[0057] If the cable is detected to be overheating upon power-up, VBUS will be limited to operate at a low voltage of 5V. As time passes, the temperature will decrease to the recovery temperature point. At this point, switch S1 will close, causing the Type-C Source terminal connected via the cable to determine that the device has been unplugged and shut off VBUS power. When VBUS is shut off, the cable's control module 10 will lose power. Since the cable has not actually been unplugged, the Source terminal will supply VBUS voltage to the control module 10 again. This is equivalent to a new power-on for the cable. Since the temperature has decreased to the recovery temperature point during power-on, it will be judged as a normal operating condition during power-on.

[0058] Compared to existing technologies, the circuit described in this invention is a technology applied to temperature protection of USB Type-C cables. During temperature protection, a large capacitor connected in parallel to ground on the CC line of the cable filters out PD communication messages, preventing the device from achieving high-voltage, high-current PD charging under protection. Simultaneously, the DM and DP lines of the cable are short-circuited during protection, further preventing other high-power charging via D+ and D-. Until the temperature recovers to a specified threshold range, the VBUS of the powered device's Sink end will maintain a low-voltage 5V charging without intermittent power supply interruptions, improving user experience and protecting the Sink end. Furthermore, during temperature protection, the cable protection circuit will not be in a state of periodic power loss, allowing stable operation with power to provide an accurate recovery point for temperature recovery. After temperature protection is released, the large capacitor on the CC line to ground and the short circuits on the DM and DP lines are automatically released, ensuring unrestricted functionality at both the Source and Sink ends. In other words, the Source end does not experience frequent power outages during temperature protection, providing a better user experience and protecting the device port for the backend Sink device.

[0059] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A cable over-temperature protection circuit, characterized in that, It includes a regulated power supply module, a first switching module, and a control module; The voltage regulator module has an input terminal for connecting to the power bus port of the first cable plug, and an output terminal for connecting to the power bus port of the control module. The first switch module has a first end for connecting to the configuration channel port of the first cable plug, a second end for connecting to the output end of the regulated power supply module, and a controlled end for connecting to the first control end of the control module. The control module has a temperature monitoring port for receiving temperature signals about the cable; wherein, the control module is used to control the first switch module through the first control terminal based on the temperature signal; the first switch module is controlled by the control module in the following manner: when the control module is powered on, if it determines that the cable is overheated based on the temperature signal, it sends a disconnect signal to the controlled terminal of the first switch module through the first control terminal to control the first switch module to disconnect; The circuit further includes a communication filtering module, whose first end is used to connect to the configuration channel port of the first cable plug, whose second end is used for grounding, and whose controlled end is connected to the second control end of the control module. The control module is also used to control the communication filtering module through the second control end according to the temperature signal, wherein the communication filtering module is controlled by the control module in the following manner: when the control module is powered on, if it determines that the cable is overheated according to the temperature signal, it sends a closing signal to the controlled end of the communication filtering module through the second control end to control the communication filtering module to work; and / or, the The circuit also includes a third switch module, whose first end is used to connect to the positive data signal port of the first cable plug, and whose second end is used to connect to the negative data signal port of the first cable plug. Its controlled end is connected to the third control end of the control module. The control module is also used to control the third switch module through the third control end. The third switch module is controlled by the control module in the following way: when the control module is powered on, if it determines that the cable is overheated based on the temperature signal, it sends a closing signal to the controlled end of the third switch module through the third control end to control the third switch module to close.

2. The cable over-temperature protection circuit as described in claim 1, characterized in that, The first switch module, the communication filtering module, and the third switch module are also controlled by the control module in the following ways: When the control module is powered on, if it determines that the cable temperature is normal based on the temperature signal, it sends disconnect signals to the controlled terminals of the first switch module, the communication filter module, and the third switch module through the first control terminal, the second control terminal, and the third control terminal, respectively, to control the first switch module to disconnect, the communication filter module to stop working, and the third switch module to disconnect.

3. The cable over-temperature protection circuit as described in claim 2, characterized in that, The first switch module, the communication filtering module, and the third switch module are also controlled by the control module in the following ways: When the power is first applied, the control module determines that the cable temperature is normal based on the temperature signal. However, as the working time progresses, it determines that the cable is overheating based on the temperature signal. The control module then sends a closing signal to the first switch module through the first control terminal to control the first switch module to close.

4. The cable over-temperature protection circuit as described in any one of claims 1 to 3, characterized in that, The first switch module, the communication filtering module, and the third switch module are also controlled by the control module in the following ways: When the power is first applied, the control module determines that the cable is overheating based on the temperature signal. However, as time goes on, it determines that the cable temperature has returned to normal based on the temperature signal. The control module then sends a closing signal to the first switch module through the first control terminal to control the first switch module to close.

5. The cable over-temperature protection circuit as described in any one of claims 1 to 3, characterized in that, The communication filtering module includes a second switch module and a capacitor. The first end of the second switch module is used to connect to the configuration channel port of the first cable plug, and the second end of the second switch module is grounded through the capacitor. The controlled end of the second switch module is connected to the first control end of the control module.

6. The cable over-temperature protection circuit as described in claim 5, characterized in that, When the second switch module is closed, the communication filtering module is operational; when the second switch module is open, the communication filtering module is not operational.

7. The cable over-temperature protection circuit as described in claim 5, characterized in that, The second switching module is an N-channel metal-oxide-semiconductor field-effect transistor.

8. The cable over-temperature protection circuit as described in any one of claims 1 to 3, characterized in that, The first switching module and the third switching module are N-channel metal-oxide-semiconductor field-effect transistors.

9. The cable over-temperature protection circuit as described in any one of claims 1 to 3, characterized in that, When the third switch module is closed, or when the communication filtering module is working, the power supply equipment supplies power to the power receiving equipment at a safe voltage through the first cable plug and the second cable plug.

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