Over-temperature protection circuit, electronic chip and type-c data line

Abstract

The application discloses a kind of over-temperature protection circuit, electronic chip and TYPE-C data line.Over-temperature protection circuit includes temperature detection module, logic control module, power supply and retention module.Temperature detection module is when the temperature of the first position in TYPE-C data line is greater than or equal to preset temperature threshold, output over-temperature signal.Logic control module is pulled high the level of channel configuration connection line for first duration in response to over-temperature signal, and is pulled low the level of channel configuration connection line for second duration at the time when first duration ends.Power supply and retention module is based on the voltage output for the voltage of logic control module power supply, and keep third duration greater than or equal to the sum of first duration and second duration, third duration is the duration that the voltage of logic control module power supply is greater than or equal to the minimum operating voltage of logic control module.By the above-mentioned mode, it can disconnect the voltage input by USB interface when TYPE-C data line appears over-temperature anomaly, to reduce the temperature of TYPE-C data line.

Description

Technical Field

[0001] This application relates to the field of data communication technology, and in particular to an over-temperature protection circuit, an electronic chip, and a TYPE-C data cable. Background Technology

[0002] Universal Serial Bus (USB) is a serial bus standard for connecting computer systems to external devices. It is also a technical specification for input / output interfaces and is widely used in information and communication products such as personal computers and mobile devices. It has also been extended to other related fields such as photographic equipment, digital televisions (set-top boxes), and game consoles.

[0003] Traditional USB is a commonly used interface with only four wires: two for power and two for signal transmission. The signal is transmitted serially, reaching speeds of up to 480Mbps, which meets various industrial and consumer needs. However, with mobile devices demanding increasingly stringent requirements for transmission speed, charging power, and interface size, the next-generation USB interface, USB Type-C, has emerged. USB Type-C, or simply Type-C or USB-C, is a hardware interface specification for Universal Serial Bus (USB). The highlights of the new interface are its slimmer design, faster transmission speeds (up to 40Gbps), and more powerful power delivery (up to 100W).

[0004] Meanwhile, to accommodate the increasing charging power demands of devices, both the charger and the device are gradually increasing the charging power, including both voltage and current. The USB PD (Power Delivery) protocol specifies support for a maximum output power of 240W, corresponding to USB cables capable of carrying 3A or 5A current, with a maximum output voltage of 48V. The USB PD protocol also specifies that the method for distinguishing between 3A and 5A USB cables is whether an electronic tag chip is embedded in the USB cable. Only when the charger identifies this electronic tag chip will it broadcast a charging current greater than 3A to the device.

[0005] However, in practical applications, many hosts ignore the provisions of the USB PD protocol and do not check in advance whether there is an electronic tag chip in the cable, thus broadcasting a charging current to the device that may be much greater than the cable's rated current. This can easily cause the cable to overheat and melt during prolonged charging. Summary of the Invention

[0006] This application aims to provide an over-temperature protection circuit, an electronic chip, and a TYPE-C data cable that can disconnect the voltage input to the USB interface when the TYPE-C data cable experiences an over-temperature abnormality, thereby reducing the temperature of the TYPE-C data cable.

[0007] To achieve the above objectives, in a first aspect, this application provides an over-temperature protection circuit applied to a TYPE-C data cable, wherein the TYPE-C data cable includes a first interface and a second interface, and the over-temperature protection circuit includes:

[0008] A temperature detection module is set at a first position in the TYPE-C data cable. The temperature detection module is used to detect the temperature at the first position and output an over-temperature signal when the temperature at the first position is greater than or equal to a preset temperature threshold.

[0009] A logic control module is connected to the temperature detection module and the channel configuration connection line, wherein the channel configuration connection line is the connection line between the channel configuration pin of the first interface and the channel configuration pin of the second interface.

[0010] The logic control module is used to respond to the over-temperature signal by raising the level of the channel configuration connection line for a first duration, and at the end of the first duration, lowering the level of the channel configuration connection line for a second duration.

[0011] A power supply and holding module is connected to the logic control module, a first power supply pin, and a second power supply pin, respectively. The first power supply pin is the bus power supply pin of the first interface, and the second power supply pin is the bus power supply pin of the second interface. Alternatively, the first power supply pin is the chip power supply pin of the first interface, and the second power supply pin is the chip power supply pin of the second interface.

[0012] The power supply and holding module is used to output a voltage to supply power to the logic control module based on a first voltage, and to maintain a third duration greater than or equal to the sum of the first duration and the second duration, wherein the third duration is the duration during which the voltage supplied to the logic control module is greater than or equal to the minimum operating voltage of the logic control module, and the first voltage is the voltage of the first power supply pin and the second power supply pin.

[0013] In one alternative embodiment, the temperature detection module includes a detection unit and a first comparison unit;

[0014] The detection unit is disposed at the first position, and the detection unit is used to detect the temperature at the first position and output a detection voltage based on the temperature at the first position;

[0015] The first comparison unit is connected to the detection unit and the logic control module respectively. The first comparison unit is used to output the over-temperature signal when the detection voltage is less than or equal to the first reference voltage, wherein when the detection voltage is less than or equal to the first reference voltage, the temperature at the first position is greater than or equal to the preset temperature threshold.

[0016] In one alternative embodiment, the detection unit includes an NTC thermistor and a current source;

[0017] The first terminal of the NTC thermistor is connected to the positive terminal of the current source, the negative terminal of the current source is connected to the second voltage source, and the second terminal of the NTC thermistor is grounded.

[0018] In one alternative embodiment, the first comparison unit includes a first comparator;

[0019] The first input terminal of the first comparator is used to input the first reference voltage, the second input terminal of the first comparator is connected to the detection unit, and the output terminal of the first comparator is connected to the logic control module.

[0020] In one alternative embodiment, the logic control module includes a timer, a logic processing unit, and a switching unit; or, the logic control module includes a second comparison unit, the logic processing unit, and the switching unit.

[0021] The timer is connected to the temperature detection module and the control processing unit respectively, and the second comparison unit is connected to the logic processing unit. Both the timer and the second comparison unit are used to output a first signal to the logic processing unit.

[0022] The timer starts timing when it receives the over-temperature signal, and the first signal output by the timer is at a first level when the timer timing duration is less than or equal to the first duration, and the first signal output by the timer is at a second level when the timer timing duration is greater than the first duration.

[0023] The first terminal of the second comparison unit is used to input a third voltage, and the second terminal of the second comparison unit is used to input a second reference voltage. The third voltage is the voltage on the bus power pin of the first interface and the bus power pin of the second interface. When the third voltage is greater than or equal to the second reference voltage, the first signal output by the second comparison unit is a first level, and when the third voltage is less than the second reference voltage, the first signal output by the second comparison unit is a second level.

[0024] The logic processing unit is also connected to the temperature detection module. The logic processing unit is used to output a first control signal to the switching unit when it receives the over-temperature signal and the first signal is at a first level. The logic processing unit is also used to output a second control signal to the switching unit when it receives the over-temperature signal and the first signal is at a second level.

[0025] The switching unit is connected to the logic processing unit, the channel configuration connection line, the fourth voltage, and ground respectively. The switching unit is used to establish a connection between the fourth voltage and the channel configuration connection line in response to the first control signal, so as to pull the level of the channel configuration connection line high for a first duration, and to establish a connection between the channel configuration connection line and ground in response to the second control signal, so as to pull the level of the channel configuration connection line low for a second duration.

[0026] In one alternative embodiment, the second comparison unit includes a second comparator;

[0027] The first input terminal of the second comparator is connected to the second reference voltage, the second input terminal of the second comparator is connected to the third voltage, and the output terminal of the second comparator is connected to the logic processing unit.

[0028] In one alternative embodiment, the logic processing unit includes a first NOT gate, a second NOT gate, a first AND gate, and a second AND gate;

[0029] The first input terminal of the first AND gate and the first input terminal of the second AND gate are both connected to the temperature detection module. The second input terminal of the first AND gate is connected to the output terminal of the first NOT gate. The output terminal of the first AND gate is connected to the input terminal of the second NOT gate. The output terminal of the second NOT gate is connected to the switching unit. The output terminal of the second AND gate is connected to the switching unit.

[0030] The input terminal of the first NOT gate and the second input terminal of the second AND gate are both connected to the timer, or the input terminal of the first NOT gate and the second input terminal of the second AND gate are both connected to the second comparison unit.

[0031] In one alternative embodiment, the switching unit includes a first switching transistor and a second switching transistor;

[0032] The first terminal of the first switch and the first terminal of the second switch are both connected to the logic processing unit. The second terminal of the first switch is connected to the fourth voltage. The third terminal of the first switch is connected to the third terminal of the second switch and the channel configuration connection line, respectively. The second terminal of the second switch is grounded.

[0033] In one alternative embodiment, the power supply and holding module includes a third switching transistor, a power supply unit, and a first capacitor; or, the power supply and holding module includes a level conversion unit, the power supply unit, and the first capacitor.

[0034] When the power supply and holding module includes the third switch, the power supply unit and the first capacitor, the third terminal of the third switch is connected to the first power supply pin and the second power supply pin, the second terminal of the third switch is connected to the power supply unit and the first terminal of the first capacitor respectively, and the second terminal of the first capacitor is grounded.

[0035] When the power supply and holding module includes the level conversion unit, the power supply unit and the first capacitor, the input terminal of the level conversion unit is connected to the first power supply pin and the second power supply pin respectively, the output terminal of the level conversion unit is connected to the power supply unit and the first terminal of the first capacitor respectively, and the second terminal of the first capacitor is grounded.

[0036] Secondly, this application provides an electronic chip, including the over-temperature protection circuit described above.

[0037] Thirdly, this application provides a TYPE-C data cable, including a first interface, a second interface, and an electronic chip as described above.

[0038] The beneficial effects of this application are as follows: The over-temperature protection circuit provided in this application is applied to a TYPE-C data line. The TYPE-C data line includes a first interface and a second interface. The over-temperature protection circuit includes a temperature detection module, a logic control module, and a power supply and holding module. The temperature detection module is located at a first position in the TYPE-C data line. The temperature detection module is used to detect the temperature at the first position and output an over-temperature signal when the temperature at the first position is greater than or equal to a preset temperature threshold. The logic control module is connected to both the temperature detection module and the channel configuration connection line. The channel configuration connection line is the connection line between the channel configuration pins of the first interface and the channel configuration pins of the second interface. The logic control module is used to respond to the over-temperature signal by pulling the level of the channel configuration connection line high for a first duration and pulling the level of the channel configuration connection line low for a second duration at the end of the first duration. The power supply and holding module is connected to the logic control module, the first power pin, and the second power pin, respectively. The first power pin is the bus power pin of the first interface, and the second power pin is the bus power pin of the second interface; alternatively, the first power pin is the chip power pin of the first interface, and the second power pin is the chip power pin of the second interface. The power supply and holding module outputs a voltage to the logic control module based on a first voltage, and maintains a third duration greater than or equal to the sum of the first and second durations. The third duration is the duration during which the voltage supplied to the logic control module is greater than or equal to the minimum operating voltage of the logic control module, and the first voltage is the voltage of the first and second power pins. In this way, when the TYPE-C data cable experiences an over-temperature anomaly, the logic control module can pull the level of the channel configuration connection line high for a first duration and pull the level of the channel configuration connection line low for a second duration at the end of the first duration, thereby disconnecting the voltage input to the first and second interfaces, i.e., disconnecting the voltage input to the USB interface, thus reducing the temperature of the TYPE-C data cable. Attached Figure Description

[0039] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0040] Figure 1 A schematic diagram illustrating the pin definitions of the male connector in a TYPE-C data cable in the prior art;

[0041] Figure 2 This is a schematic diagram of the over-temperature protection circuit provided in one embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the over-temperature protection circuit provided in one embodiment of this application;

[0043] Figure 4 A schematic diagram of the circuit structure of a temperature detection module provided in an embodiment of this application;

[0044] Figure 5 A schematic diagram of the resistance versus temperature curve provided in one embodiment of this application;

[0045] Figure 6 A schematic diagram of the circuit structure of a logic control module provided in an embodiment of this application;

[0046] Figure 7 This is a schematic diagram of the over-temperature protection circuit provided in one embodiment of this application;

[0047] Figure 8 This is a schematic diagram of the over-temperature protection circuit provided in one embodiment of this application;

[0048] Figure 9 A schematic diagram of the circuit structure of a power supply and holding module provided in an embodiment of this application;

[0049] Figure 10 This is a schematic diagram of the circuit structure of a power supply and holding module provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Please refer to Figure 1 , Figure 1 This is a schematic diagram illustrating the pin definitions of the male connector in a prior art TYPE-C data cable. As is well known, a TYPE-C data cable has two identical male connectors. For example... Figure 1 As shown, pin A5 (CC pin) of any male connector is the channel configuration pin; pins A4, A9, B4, and B9 (VBUS) are all bus power supply pins; pin B5 (VCONN) is the chip power supply pin; pin A6 (D+) is the differential signal positive pin, and pin A7 (D-) is the differential signal negative pin.

[0052] In related technologies, the USB PD protocol specifies that the method for distinguishing between 3A and 5A USB cables is whether an electronic tag chip is built into the USB cable. Only when the charger identifies this electronic tag chip will it broadcast a charging current greater than 3A to the device.

[0053] However, in practical applications, many host devices (such as chargers connected to a male connector on a TYPE-C data cable) disregard the provisions of the USB PD protocol and do not pre-check whether there is an electronic tag chip in the cable, thus broadcasting a charging current to the device that may be much greater than the cable's rated current. This can easily cause the cable to overheat and melt during prolonged charging.

[0054] Based on this, this application provides an over-temperature protection circuit that can disconnect the voltage input to the USB interface when the TYPE-C data line experiences an over-temperature abnormality, thereby reducing the temperature of the TYPE-C data line.

[0055] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the over-temperature protection circuit provided in an embodiment of this application. The over-temperature protection circuit 100 is applied to a Type-C data cable. The Type-C data cable includes a first interface J1 and a second interface J2. The first interface J1 corresponds to one male connector on the Type-C data cable, and the second interface J2 corresponds to the other male connector on the Type-C data cable. In the embodiments of this application, the first interface J1 and the second interface J2 are also referred to as USB interfaces in the Type-C data cable.

[0056] The over-temperature protection circuit includes a temperature detection module, a logic control module, and a power supply and holding module. The temperature detection module is located at a first position on the TYPE-C data cable. This first position can be any position on the TYPE-C data cable, but is preferably located near either the first or second interface. The logic control module is connected to both the temperature detection module and the channel configuration connection line (the connection line between the CC pin of the first interface and the CC pin of the second interface). The power supply and holding module is connected to the logic control module, a first power supply pin, and a second power supply pin. Specifically, the first power supply pin is the bus power supply pin (VBUS pin) of the first interface, and the second power supply pin is the bus power supply pin (VBUS pin) of the second interface; alternatively, the first power supply pin is the chip power supply pin (VCONN pin) of the first interface, and the second power supply pin is the chip power supply pin (VCONN pin) of the second interface.

[0057] It is understood that in this embodiment, the power supply and protection module is connected to the bus power pins of the first interface, the bus power pins of the second interface, the chip power pins of the first interface, and the chip power pins of the second interface, respectively. In other embodiments, the power supply and protection module may only be connected to the bus power pins of the first interface and the bus power pins of the second interface, or the power supply and protection module may only be connected to the chip power pins of the first interface and the chip power pins of the second interface. This application does not impose specific limitations on this.

[0058] Specifically, the temperature detection module is used to detect the temperature at a first location and output an over-temperature signal when the temperature at the first location is greater than or equal to a preset temperature threshold. The channel configuration connection line is the connection line between the channel configuration pins of the first interface and the channel configuration pins of the second interface. In one embodiment, the temperature detection module is further used to stop outputting the over-temperature signal when the temperature at the first location is less than the preset temperature threshold. The preset temperature threshold is a pre-set temperature threshold that can be set according to actual application conditions; this application embodiment does not impose specific limitations on it.

[0059] The logic control module responds to an over-temperature signal by raising the channel configuration connection line high for a first duration, thus maintaining the channel configuration connection line at a high level for that duration. The logic control module also lowers the channel configuration connection line low for a second duration at the end of the first duration, thus maintaining the channel configuration connection line at a low level for that second duration. By raising the channel configuration connection line high for the first duration, the USB system, including the TYPE-C data cable, is disconnected, i.e., the voltage input to the USB interface is disconnected. At this time, even if the TYPE-C data cable is connected to a host such as a charger, there is no voltage on the first and second interfaces of the TYPE-C data cable; that is, there is no voltage on the bus power pin of the first interface, the bus power pin of the second interface, the chip power pin of the first interface, and the chip power pin of the second interface. The temperature of the TYPE-C data cable can be reduced. Then, by lowering the channel configuration connection line low for a second duration at the end of the first duration, the USB system remains disconnected, allowing the temperature of the TYPE-C data cable to continue to decrease, preventing the TYPE-C data cable from melting due to overheating.

[0060] The power supply and holding module supplies power to the logic control module based on a first voltage output and maintains a third duration greater than or equal to the sum of the first and second durations. The third duration is the time during which the voltage supplied to the logic control module (denoted as Vup) is greater than or equal to the minimum operating voltage (Vmin) of the logic control module. The first voltage is the voltage between the first and second power pins. That is, the third duration is the time during which the voltage Vup provided by the power supply and holding module is greater than or equal to the voltage Vmin. The third duration is greater than the sum of the first and second durations. Therefore, during the third duration, since the voltage Vup remains greater than or equal to the voltage Vmin, the logic control module can maintain normal operation. This allows the logic control module to pull the channel configuration connection line high for the first duration and pull the channel configuration connection line low for the second duration. This, in turn, maintains the voltage at the disconnected USB interface input to reduce the temperature of the TYPE-C data cable.

[0061] In one embodiment, such as Figure 3 As shown, the temperature detection module includes a detection unit and a first comparison unit. The detection unit is located at the first position. The first comparison unit is connected to both the detection unit and the logic control module.

[0062] Specifically, the detection unit is used to detect the temperature at a first location and output a detection voltage based on the temperature at the first location. The first comparison unit is used to output an over-temperature signal when the detection voltage is less than or equal to a first reference voltage. Wherein, when the detection voltage is less than or equal to the first reference voltage, the temperature at the first location is greater than or equal to a preset temperature threshold.

[0063] Please refer to the above as well. Figure 4 , Figure 4 The example shown is a circuit structure of a detection unit. Figure 4 As shown, the detection unit includes an NTC thermistor and a current source.

[0064] In this embodiment, the first terminal of the NTC thermistor is connected to the positive terminal of the current source, the negative terminal of the current source is connected to the second voltage source, and the second terminal of the NTC thermistor is grounded. In some implementations, the second voltage can be obtained from the voltage on the first power supply pin and the second power supply pin in the above embodiment.

[0065] Figure 4 A circuit structure for the first comparison unit is also exemplarily shown. For example... Figure 4 As shown, the first comparison unit includes a first comparator.

[0066] In this embodiment, the first input terminal of the first comparator is used to input the first reference voltage, the second input terminal of the first comparator is connected to the detection unit, and the output terminal of the first comparator is connected to the logic control module. In this example, the first input terminal of the first comparator is a non-inverting input terminal, and the second input terminal is an inverting input terminal.

[0067] The following are Figure 4 The principle of the circuit structure shown will be explained.

[0068] Please refer to the above as well. Figure 5 , Figure 5 The image shows a curve illustrating the resistance of an NTC thermistor as a function of temperature. The horizontal axis represents temperature (T), and the vertical axis represents resistance (R). Curve L1 shows the resistance changing with temperature. Curve L1 indicates that the NTC thermistor is a negative temperature coefficient thermistor; its resistance decreases exponentially with increasing temperature, exhibiting a negative temperature coefficient phenomenon. This NTC thermistor is placed in the first position of the TYPE-C data cable, and it reflects the temperature at that first position.

[0069] During operation, a current I1 flows from the current source and through the NTC thermistor, thereby generating a detection voltage VNTC. Based on Ohm's law, VNTC = I1 * r1 (1), where r1 is the resistance value of the NTC thermistor. As mentioned above, the NTC thermistor's resistance changes negatively with its temperature. As the temperature rises from a low temperature to a high temperature, the resistance value of the NTC thermistor changes from a larger value at low temperatures to a smaller value at high temperatures. Consequently, according to formula (1), the detection voltage VNTC will gradually decrease as the temperature of the NTC thermistor increases.

[0070] When the detected voltage VNTC drops to less than or equal to the first reference voltage, the first comparator outputs an over-temperature signal. In this embodiment, the over-temperature signal output by the first comparator corresponds to the signal OT output by the first comparator being a high-level signal. In summary, when the signal OT output by the first comparator is a high-level signal, it corresponds to the detected voltage VNTC being less than or equal to the first reference voltage, which means that the temperature at the first location is greater than or equal to a preset temperature threshold. At this time, it is determined that the cable temperature of the TYPE-C data cable is too high.

[0071] In one embodiment, please refer to the reference. Figure 3 The logic control module includes a timer, a logic processing unit, and a switching unit. The timer is connected to both the temperature detection module and the control processing unit. The logic processing unit is also connected to the temperature detection module. The switching unit is connected to the logic processing unit, the channel configuration connection line, the fourth voltage, and ground.

[0072] Specifically, the timer is used to output a first signal to the logic processing unit. The timer starts timing upon receiving an over-temperature signal. Furthermore, when the timer's timing duration is less than or equal to a first duration, the first signal output by the timer is at a first level; when the timer's timing duration is greater than the first duration, the first signal output by the timer is at a second level.

[0073] The logic processing unit is configured to output a first control signal to the switching unit when an over-temperature signal is received and the first signal is at a first level. The logic processing unit is also configured to output a second control signal to the switching unit when an over-temperature signal is received and the first signal is at a second level.

[0074] The switching unit is used to establish a connection between the fourth voltage and the channel configuration connection line in response to the first control signal, so as to pull the level of the channel configuration connection line high for a first duration, and to establish a connection between the channel configuration connection line and ground in response to the second control signal, so as to pull the level of the channel configuration connection line low for a second duration.

[0075] In summary, during the first duration of the over-temperature signal output by the temperature detection module, the first signal output by the timer is at the first level. At this time, the logic processing unit outputs the first control signal to the switching unit. The switching unit establishes a connection between the fourth voltage and the channel configuration connection line to pull the level of the channel configuration connection line high. The duration for which the level of the channel configuration connection line is pulled high is the first duration.

[0076] During the second time period after the first time period ends, the first signal output by the timer is at the second level. At this time, the logic processing unit outputs a second control signal to the switching unit. The switching unit establishes a connection between the ground and the channel configuration connection line to pull the level of the channel configuration connection line low. The duration for which the level of the channel configuration connection line is pulled low is the second time period.

[0077] Please refer to Figure 6 , Figure 6 The example shown is one structure of a logic processing unit. For example... Figure 6 As shown, the logic processing unit includes a first NOT gate, a second NOT gate, a first AND gate, and a second AND gate.

[0078] Specifically, the first input terminal of the first AND gate and the first input terminal of the second AND gate are both connected to the temperature detection module; the input terminal of the first NOT gate and the second input terminal of the second AND gate are both connected to the timer; the input terminal of the first NOT gate and the second input terminal of the second AND gate are both used to input the first signal; the second input terminal of the first AND gate is connected to the output terminal of the first NOT gate; the output terminal of the first AND gate is connected to the input terminal of the second NOT gate; the output terminal of the second NOT gate is connected to the switching unit; and the output terminal of the second AND gate is connected to the switching unit.

[0079] Figure 6 One structure of the switching unit is also shown. For example... Figure 6 As shown, the switching unit includes a first switching transistor and a second switching transistor.

[0080] The first terminal of the first switch and the first terminal of the second switch are both connected to the logic processing unit. The second terminal of the first switch is connected to the fourth voltage. The third terminal of the first switch and the third terminal of the second switch are connected to the first node. The first node is used to connect to the channel configuration connection line. The second terminal of the second switch is grounded.

[0081] In this embodiment, the fourth voltage corresponds to the voltage provided by the power supply and holding module to power the logic control module in the above embodiment.

[0082] In this embodiment, the first switching transistor is a PMOS transistor, and the second switching transistor is an NMOS transistor. The gate of the PMOS transistor is the first terminal of the first switching transistor, the source of the PMOS transistor is the second terminal of the first switching transistor, and the drain of the PMOS transistor is the third terminal of the first switching transistor. Similarly, the gate of the NMOS transistor is the first terminal of the second switching transistor, the source of the NMOS transistor is the second terminal of the second switching transistor, and the drain of the NMOS transistor is the third terminal of the second switching transistor.

[0083] In addition, the first and second switching transistors can be any controllable switches, such as insulated gate bipolar transistor (IGBT) devices, integrated gate commutated thyristor (IGCT) devices, gate turn-off thyristor (GTO) devices, silicon controlled rectifier (SCR) devices, junction gate field-effect transistor (JFET) devices, MOS controlled thyristor (MCT) devices, etc.

[0084] Please refer to Table 1 as well; the following will be based on Table 1. Figure 6 The principle of the circuit shown is explained. Table 1 shows the signal OT, the first signal, and the state at the first node. In Table 1, the signal OT is... Figure 4 The signals output by the first comparator shown are: the first signal is the timer output; the first node is the connection point between the first and second switching transistors; 0 represents a low level, and 1 represents a high level. A high-impedance output indicates that the first node does not affect the channel configuration connection line; a pull-up output indicates that the voltage of the first node can pull the channel configuration connection line high; and a pull-down output indicates that the voltage of the first node can pull the channel configuration connection line low.

[0085] Table 1

[0086] OT S1 The state of the first node N1 0 0 High impedance output 0 1 High impedance output 1 0 Pull-up output 1 1 pull-down output

[0087] In this embodiment, before an over-temperature anomaly occurs, as described in the previous embodiment, before the first comparator outputs an over-temperature signal, the signal OT is at a low level. At this time, regardless of whether the first signal is high or low, the state of the first node is a high-impedance output. The TYPE-C data line operates normally.

[0088] When an over-temperature anomaly occurs, as described in the above embodiment, the first comparator outputs an over-temperature signal, i.e., signal OT is high. At this time, during the first duration of the over-temperature signal output by the temperature detection module, the first signal output by the timer is at a first level (low level in this embodiment). Subsequently, the first NOT gate outputs a high level, the first AND gate outputs a high level, the second NOT gate outputs a low level, and the first switch is turned on. The fourth voltage establishes a connection with the channel configuration connection line through the first node, and the state of the first node is a pull-up output, pulling the level of the channel configuration connection line high. Simultaneously, the second AND gate outputs a low level, and the second switch is turned off.

[0089] During the second time period after the first time period ends, the first signal output by the timer is at the second level (high level in this embodiment). Subsequently, the first NOT gate outputs a low level, the first AND gate outputs a low level, the second NOT gate outputs a high level, and the first switch is turned off. Simultaneously, the second AND gate outputs a high level, and the second switch is turned on. The first node is grounded through the second switch, and the state of the first node is pulled down, pulling the level of the channel configuration connection line low.

[0090] In some implementations, the temperature at the first location gradually decreases after the voltage level of the channel configuration connection line is pulled low. At this time, in Figure 4 In this process, the detection voltage VNTC will gradually increase as the temperature of the NTC thermistor decreases. If the temperature at the first location drops below a preset temperature threshold, the temperature detection module stops outputting an over-temperature signal. Corresponding to the detection voltage VNTC increasing to exceed the first reference voltage, the signal OT output by the first comparator is a low-level signal. As shown in Table 1, regardless of whether the first signal is high or low, the state of the first node is a high-impedance output. The TYPE-C data line resumes normal operation. In this embodiment, the time interval from the moment the channel configuration connection line is pulled low to the moment the detection voltage VNTC exceeds the first reference voltage corresponds to the second duration in the above embodiment.

[0091] In another embodiment, please refer to Figure 7 , Figure 7 Another structure for the logic control module is also shown. For example... Figure 7 As shown, the logic control module includes a second comparison unit, a logic processing unit, and a switching unit. The logic processing unit and the switching unit can be referenced as described above for... Figure 3The detailed descriptions of the logic processing units and switching units are omitted here.

[0092] The second comparison unit is connected to the logic processing unit and outputs a first signal to the logic processing unit. The first terminal of the second comparison unit is used to input a third voltage, and the second terminal is used to input a second reference voltage. The third voltage is the voltage between the bus power pin of the first interface and the bus power pin of the second interface.

[0093] Specifically, when the third voltage is greater than or equal to the second reference voltage, the first signal output by the second comparison unit is at the first level, and when the third voltage is less than the second reference voltage, the first signal output by the second comparison unit is at the second level.

[0094] In this embodiment, when the temperature detection module outputs an over-temperature signal, the third voltage is greater than or equal to the second reference voltage, and the first signal output by the second comparison unit is at a first level. At this time, the logic processing unit outputs a first control signal to the switching unit. The switching unit establishes a connection between the fourth voltage and the channel configuration connection line to pull the level of the channel configuration connection line high. The third voltage gradually decreases until it decreases to less than the second reference voltage. The duration for which the third voltage remains greater than or equal to the second reference voltage is the first duration, and the duration for which the level of the channel configuration connection line is pulled high is also the first duration.

[0095] When the third voltage decreases to below the second reference voltage, the first signal output by the second comparison unit becomes the second level, the first duration ends, and the second duration begins. At this time, the logic processing unit outputs a second control signal to the switching unit. The switching unit establishes a connection between ground and the channel configuration connection line to pull the level of the channel configuration connection line low. The duration for which the third voltage is kept below the second reference voltage is the second duration, and the duration for which the level of the channel configuration connection line is pulled low is also the second duration.

[0096] In one embodiment, such as Figure 8 As shown, the second comparison unit includes a second comparator.

[0097] The first input terminal of the second comparator is connected to the second reference voltage, and the second input terminal of the second comparator is connected to the third voltage. Specifically, the second input terminal of the second comparator is connected to the bus power pin of the first interface and the bus power pin of the second interface, and the third voltage is the voltage on the bus power pin of the first interface and the bus power pin of the second interface. The output terminal of the second comparator is connected to the logic processing unit.

[0098] Specifically, when the temperature detection module outputs an over-temperature signal, the third voltage is greater than or equal to the second reference voltage, and the first signal output by the second comparator is at the first level. At this time, the logic processing unit outputs a first control signal to the switching unit. The switching unit establishes a connection between the fourth voltage and the channel configuration connection line to pull the level of the channel configuration connection line high.

[0099] The third voltage gradually decreases. When the third voltage decreases to below the second reference voltage, the first signal output by the second comparator becomes the second level. At this time, the logic processing unit outputs a second control signal to the switching unit. The switching unit establishes a connection between ground and the channel configuration connection line to pull the level of the channel configuration connection line low.

[0100] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the circuit structure of the power supply and holding module provided in an embodiment of this application. Figure 9 As shown, the power supply and holding module includes a third switching transistor, a power supply unit, and a first capacitor.

[0101] The third terminal of the third switch is connected to the first power supply pin and the second power supply pin (not shown in the figure), the second terminal of the third switch is connected to the power supply unit and the first terminal of the first capacitor, and the second terminal of the first capacitor is grounded.

[0102] Specifically, the third terminal of the third switch is used to input a first voltage, which is the voltage on the bus power supply pin of the first interface and the bus power supply pin of the second interface, or the first voltage is the voltage on the chip power supply pin of the first interface and the chip power supply pin of the second interface.

[0103] The first voltage charges the first capacitor through the body diode of the third switch, making the voltage at the first terminal of the first capacitor the fourth voltage. Furthermore, when the channel configuration connection line is pulled high, disconnecting the USB system including the TYPE-C data cable (at this time, there is no voltage on the bus power pin of the first interface, the bus power pin of the second interface, the chip power pin of the first interface, and the chip power pin of the second interface), the first capacitor begins to discharge to maintain the fourth voltage, i.e., to maintain power supply to the logic control module, so that the logic control module can continue to operate (i.e., keep the logic control module active). This continues until the over-temperature anomaly disappears or the capacity of the first capacitor is exhausted. The duration for which the voltage of the first capacitor is greater than or equal to the minimum operating voltage of the logic control module corresponds to the third duration in the above embodiment. To keep the logic control module active, the third duration must be greater than the sum of the first and second durations.

[0104] The third duration can be determined by the following formula: t = CHOLD * (Vmax - Vmin) / IUP, where t is the third duration, CHOLD is the capacitance value of the first capacitor, Vmax is the maximum voltage on the first capacitor (in this embodiment, it is the first voltage, i.e., the voltage between the bus power pin of the first interface and the bus power pin of the second interface, or the voltage between the chip power pin of the first interface and the chip power pin of the second interface), Vmin is the minimum operating voltage of the logic control module, and IUP is the discharge current of the first capacitor. In this embodiment, by adjusting the capacitance value of the first capacitor, the third duration can be adjusted, thereby allowing the TYPE-C data cable sufficient cooling time to dissipate heat and ensuring the safety of the USB system including the TYPE-C data cable.

[0105] In this embodiment, a PMOS transistor is used as the third switch. The gate of the PMOS transistor is the first terminal of the third switch, the source of the PMOS transistor is the second terminal of the third switch, and the drain of the PMOS transistor is the third terminal of the third switch.

[0106] In addition, the third switch can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0107] In this embodiment, the power supply unit converts the fourth voltage to output a voltage different from the fourth voltage, thereby powering other circuit structures in the chip including the over-temperature protection circuit. Of course, in other embodiments, if the fourth voltage is sufficient for the chip including the over-temperature protection circuit, a power supply unit may not be necessary.

[0108] Furthermore, in this embodiment, if no signal is connected to the first terminal of the third switch, the third switch remains open. Of course, in other embodiments, the first terminal of the third switch can also be connected to a logic control module, and the third switch is controlled by the logic control module. The logic control module is used to turn on the third switch when it detects that the first voltage is greater than a preset voltage. At this time, the first voltage charges the first capacitor C1 through the third switch, which can reduce the voltage drop across the body diode of the third switch.

[0109] Please refer to Figure 10 , Figure 10 A circuit structure for a power supply and holding module provided in another embodiment of this application. For example... Figure 10 As shown, the power supply and holding module includes a level conversion unit, a power supply unit, and a first capacitor. The power supply unit and the first capacitor can be referenced as described above for... Figure 9 The detailed description of the power supply unit and the first capacitor is omitted here.

[0110] The input terminal of the level conversion unit is connected to the first power supply pin and the second power supply pin respectively, the output terminal of the level conversion unit is connected to the power supply unit and the first terminal of the first capacitor respectively, and the second terminal of the first capacitor is grounded.

[0111] Specifically, the first voltage is the voltage on the bus power pin of the first interface and the bus power pin of the second interface, or the first voltage is the voltage on the chip power supply pin of the first interface and the chip power supply pin of the second interface. The range of variation of the first voltage may be large. Then, a level conversion unit can be provided to convert the input first voltage into a voltage with a smaller range of variation. This voltage then charges the first capacitor, so that the voltage at the first terminal of the first capacitor is the fourth voltage. In this embodiment, the level conversion unit is a unidirectional output, capable of blocking the reverse flow of energy from the output to the input when the input power is lost.

[0112] This application also provides an electronic chip, which includes the over-temperature protection circuit 100 in any embodiment of this application.

[0113] This application also provides a TYPE-C data cable, which includes a first interface, a second interface, and an electronic chip as described in any embodiment of this application.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An over-temperature protection circuit, characterized in that, Applied to a TYPE-C data cable, the TYPE-C data cable includes a first interface and a second interface, and the over-temperature protection circuit includes: A temperature detection module is set at a first position in the TYPE-C data cable. The temperature detection module is used to detect the temperature at the first position and output an over-temperature signal when the temperature at the first position is greater than or equal to a preset temperature threshold. A logic control module is connected to the temperature detection module and the channel configuration connection line, wherein the channel configuration connection line is the connection line between the channel configuration pin of the first interface and the channel configuration pin of the second interface. The logic control module is used to respond to the over-temperature signal by raising the level of the channel configuration connection line for a first duration, and at the end of the first duration, lowering the level of the channel configuration connection line for a second duration. A power supply and holding module is connected to the logic control module, a first power supply pin, and a second power supply pin, respectively. The first power supply pin is the bus power supply pin of the first interface, and the second power supply pin is the bus power supply pin of the second interface. Alternatively, the first power supply pin is the chip power supply pin of the first interface, and the second power supply pin is the chip power supply pin of the second interface. The power supply and holding module is used to output a voltage to supply power to the logic control module based on a first voltage, and to maintain a third duration greater than or equal to the sum of the first duration and the second duration, wherein the third duration is the duration during which the voltage supplied to the logic control module is greater than or equal to the minimum operating voltage of the logic control module, and the first voltage is the voltage of the first power supply pin and the second power supply pin.

2. The over-temperature protection circuit according to claim 1, characterized in that, The temperature detection module includes a detection unit and a first comparison unit; The detection unit is disposed at the first position, and the detection unit is used to detect the temperature at the first position and output a detection voltage based on the temperature at the first position; The first comparison unit is connected to the detection unit and the logic control module respectively. The first comparison unit is used to output the over-temperature signal when the detection voltage is less than or equal to the first reference voltage, wherein when the detection voltage is less than or equal to the first reference voltage, the temperature at the first position is greater than or equal to the preset temperature threshold.

3. The over-temperature protection circuit according to claim 2, characterized in that, The detection unit includes an NTC thermistor and a current source; The first terminal of the NTC thermistor is connected to the positive terminal of the current source, the negative terminal of the current source is connected to the second voltage source, and the second terminal of the NTC thermistor is grounded.

4. The over-temperature protection circuit according to claim 2, characterized in that, The first comparison unit includes a first comparator; The first input terminal of the first comparator is used to input the first reference voltage, the second input terminal of the first comparator is connected to the detection unit, and the output terminal of the first comparator is connected to the logic control module.

5. The over-temperature protection circuit according to claim 1, characterized in that, The logic control module includes a timer, a logic processing unit, and a switching unit; or, the logic control module includes a second comparison unit, the logic processing unit, and the switching unit. The timer is connected to the temperature detection module and the logic processing unit respectively, and the second comparison unit is connected to the logic processing unit. Both the timer and the second comparison unit are used to output a first signal to the logic processing unit. The timer starts timing when it receives the over-temperature signal, and the first signal output by the timer is at a first level when the timer timing duration is less than or equal to the first duration, and the first signal output by the timer is at a second level when the timer timing duration is greater than the first duration. The first terminal of the second comparison unit is used to input a third voltage, and the second terminal of the second comparison unit is used to input a second reference voltage. The third voltage is the voltage on the bus power pin of the first interface and the bus power pin of the second interface. When the third voltage is greater than or equal to the second reference voltage, the first signal output by the second comparison unit is a first level, and when the third voltage is less than the second reference voltage, the first signal output by the second comparison unit is a second level. The logic processing unit is also connected to the temperature detection module. The logic processing unit is used to output a first control signal to the switching unit when it receives the over-temperature signal and the first signal is at a first level. The logic processing unit is also used to output a second control signal to the switching unit when it receives the over-temperature signal and the first signal is at a second level. The switching unit is connected to the logic processing unit, the channel configuration connection line, the fourth voltage, and ground respectively. The switching unit is used to establish a connection between the fourth voltage and the channel configuration connection line in response to the first control signal, so as to pull the level of the channel configuration connection line high for a first duration, and to establish a connection between the channel configuration connection line and ground in response to the second control signal, so as to pull the level of the channel configuration connection line low for a second duration.

6. The over-temperature protection circuit according to claim 5, characterized in that, The second comparison unit includes a second comparator; The first input terminal of the second comparator is connected to the second reference voltage, the second input terminal of the second comparator is connected to the third voltage, and the output terminal of the second comparator is connected to the logic processing unit.

7. The over-temperature protection circuit according to claim 5, characterized in that, The logic processing unit includes a first NOT gate, a second NOT gate, a first AND gate, and a second AND gate; The first input terminal of the first AND gate and the first input terminal of the second AND gate are both connected to the temperature detection module. The second input terminal of the first AND gate is connected to the output terminal of the first NOT gate. The output terminal of the first AND gate is connected to the input terminal of the second NOT gate. The output terminal of the second NOT gate is connected to the switching unit. The output terminal of the second AND gate is connected to the switching unit. The input terminal of the first NOT gate and the second input terminal of the second AND gate are both connected to the timer, or the input terminal of the first NOT gate and the second input terminal of the second AND gate are both connected to the second comparison unit.

8. The over-temperature protection circuit according to claim 5, characterized in that, The switching unit includes a first switching transistor and a second switching transistor; The first terminal of the first switch and the first terminal of the second switch are both connected to the logic processing unit. The second terminal of the first switch is connected to the fourth voltage. The third terminal of the first switch is connected to the third terminal of the second switch and the channel configuration connection line, respectively. The second terminal of the second switch is grounded.

9. The over-temperature protection circuit according to claim 1, characterized in that, The power supply and holding module includes a third switching transistor, a power supply unit, and a first capacitor; or, the power supply and holding module includes a level conversion unit, the power supply unit, and the first capacitor. When the power supply and holding module includes the third switch, the power supply unit and the first capacitor, the third terminal of the third switch is connected to the first power supply pin and the second power supply pin, the second terminal of the third switch is connected to the power supply unit and the first terminal of the first capacitor respectively, and the second terminal of the first capacitor is grounded. When the power supply and holding module includes the level conversion unit, the power supply unit and the first capacitor, the input terminal of the level conversion unit is connected to the first power supply pin and the second power supply pin respectively, the output terminal of the level conversion unit is connected to the power supply unit and the first terminal of the first capacitor respectively, and the second terminal of the first capacitor is grounded.

10. An electronic chip, characterized in that, Includes the over-temperature protection circuit as described in any one of claims 1-9.

11. A TYPE-C data cable, characterized in that, It includes a first interface, a second interface, and the electronic chip as described in claim 10.

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