Data line with temperature protection

Abstract

The utility model discloses a data line with temperature protection, including a cable, the one end of cable is equipped with the first interface for connecting the power receiving equipment, the other end of cable is equipped with the second interface for connecting the power supply equipment, be equipped with a circuit board in the casing of first interface, be equipped with temperature protection circuit and first seat on the circuit board, temperature protection circuit connects first seat and second interface, when the temperature protection circuit detects that the temperature in first interface is greater than the upper threshold value, disconnects the power supply of power receiving equipment, detects when the temperature is less than or equal to the lower threshold value, restores the power supply to power receiving equipment. No matter what working state the power receiving equipment is in, it can control whether to supply power according to the temperature, solving the problem that the existing overcurrent protection relies on the working state of the power receiving equipment, leading to protection failure.

Description

Technical Field

[0001] This utility model relates to the field of electronic technology, and in particular to a data cable with temperature protection. Background Technology

[0002] Currently, most electronic devices use Micro USB or Type-C USB as the interface for powering the device. Frequent plugging and unplugging during prolonged use can damage these USB connectors. Sweat, other liquids, or dust containing conductive particles can accumulate inside the USB connector, creating a micro-short circuit between the positive and negative terminals. When power is supplied, this micro-short circuit causes a significant accumulation of heat, leading to a rapid increase in the internal temperature of the USB connector, potentially burning out the connector, damaging the device, and in severe cases, even igniting nearby flammable materials and causing a fire.

[0003] To address these issues, a common approach is to monitor the temperature near the Micro USB or Type-C USB connector using the powered device. When the temperature exceeds a set threshold, the powered device issues a warning or triggers a short circuit in its internal power supply path via software control. This induces overcurrent protection in the power supply device, causing it to stop supplying power and thus protecting the powered device. However, this protection scheme only operates when the powered device is powered on and functioning normally. It fails to provide protection when the device is powered off or in an abnormal operating state. Furthermore, with numerous power supply device manufacturers on the market, the quality of power supplies is difficult to guarantee. Power supplies lacking overcurrent protection or with inappropriate overcurrent protection threshold settings may not provide effective protection. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a data cable with temperature protection to solve the problem that the existing overcurrent protection relies on the working state of the powered equipment, which leads to the failure of the protection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A data cable with temperature protection includes a cable, one end of which has a first interface for connecting to a powered device, and the other end of which has a second interface for connecting to a powered device. A circuit board is provided inside the housing of the first interface, and the circuit board has a temperature protection circuit and a first socket. The temperature protection circuit is connected to the first socket and the second interface. When the temperature protection circuit detects that the temperature within the first interface is greater than the upper threshold, it disconnects the power supply to the powered device; when the temperature is less than or equal to the lower threshold, it restores the power supply to the powered device.

[0006] In the aforementioned data cable with temperature protection, the temperature protection circuit includes a step-down module, a comparator module, and a switch module; the step-down module is connected to the comparator module, the switch module, and the power pin of the second socket in the second interface; the comparator module is connected to the switch module, and the switch module is connected to the power pin of the second socket and the power pin of the first socket through a power line in the cable; The step-down module reduces the voltage transmitted by the second connector and outputs a power supply to power the comparator module and the switching module. The comparison module outputs corresponding high and low level control signals based on the temperature change inside the socket of the first interface; The switching module controls the on / off state between the power line and the power pin of the first socket according to the control signal.

[0007] In the aforementioned data line with temperature protection, the step-down module includes a step-down chip, a first capacitor, and a second capacitor; The IN pin of the step-down chip is connected to one end of the first capacitor and is connected to the power pin of the second socket through the power line in the cable; the OUT pin of the step-down chip is the power supply terminal and is connected to one end of the second capacitor; the GND pin of the step-down chip, the other end of the first capacitor, and the other end of the second capacitor are all grounded.

[0008] In the aforementioned data line with temperature protection, the comparison module includes a comparator, an NTC resistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; The comparator's IN+ pin is connected to one end of the first resistor, one end of the second resistor, and one end of the third resistor; the other end of the first resistor is connected to the power supply terminal; the other end of the second resistor and the comparator's V- pin are both grounded; the comparator's IN- pin is connected to one end of the NTC resistor; the other end of the NTC resistor and the comparator's V+ pin are both connected to the power supply terminal; the comparator's OUT pin is connected to the other end of the third resistor, one end of the fourth resistor, and the switch module; the other end of the fourth resistor is connected to the power supply terminal.

[0009] In the aforementioned data line with temperature protection, the NTC resistor is positioned adjacent to the first connector.

[0010] In the aforementioned data line with temperature protection, the comparison module further includes a fifth resistor and a third capacitor. The fifth resistor is connected between the comparator's IN- pin and ground, and the third capacitor is connected between the comparator's V+ pin and ground.

[0011] In the aforementioned data line with temperature protection, the switching module includes a first switching transistor, a second switching transistor, a sixth resistor, and a seventh resistor; The gate of the first switching transistor is connected to the OUT pin of the comparator, the source of the first switching transistor is grounded, the drain of the first switching transistor is connected to the gate of the second switching transistor and one end of the seventh resistor through the sixth resistor, the source of the second switching transistor is connected to the other end of the seventh resistor and the power supply pin of the second socket, and the drain of the second switching transistor is connected to the power supply pin of the first socket.

[0012] In the aforementioned data line with temperature protection, the first switching transistor is an NMOS transistor, and the second switching transistor is a PMOS transistor.

[0013] Compared to existing technologies, the data cable with temperature protection provided by this utility model includes a cable. One end of the cable has a first interface for connecting to a powered device, and the other end of the cable has a second interface for connecting to a powered device. A circuit board is housed inside the housing of the first interface. The circuit board has a temperature protection circuit and a first socket. The temperature protection circuit is connected to the first socket and the second interface. When the temperature in the first interface exceeds an upper threshold, the temperature protection circuit disconnects the power supply to the powered device; when the temperature is less than or equal to a lower threshold, it restores the power supply to the powered device. Regardless of the operating state of the powered device, the power supply can be controlled based on temperature, solving the problem of existing overcurrent protection relying on the operating state of the powered device, which leads to protection failure. Attached Figure Description

[0014] Figure 1 This is a structural block diagram of the data cable with temperature protection provided by this utility model.

[0015] Figure 2 This is a circuit diagram of the temperature protection circuit provided by this utility model. Detailed Implementation

[0016] This utility model provides a data cable with temperature protection. To make the objectives, technical solutions, and advantages of this utility model clearer and more explicit, the following detailed description, with reference to the accompanying drawings and embodiments, further illustrates the utility model. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this utility model.

[0017] Please see Figure 1 The data cable with temperature protection provided by this utility model includes a cable 10. One end of the cable 10 is provided with a first interface for connecting to a powered device, and the other end of the cable 10 is provided with a second interface for connecting to a powered device. A circuit board is provided inside the housing of the first interface. The circuit board is provided with a temperature protection circuit 20 and a first connector J1. The temperature protection circuit 20 is connected to the first connector J1 and the second interface. When the temperature in the first interface is detected to be greater than the upper limit threshold, the temperature protection circuit 20 disconnects the power supply to the powered device; when the temperature is detected to be less than or equal to the lower limit threshold, the power supply to the powered device is restored.

[0018] This embodiment primarily adds a temperature protection circuit 20 inside the housing of the interface connecting the powered device. The cable and the types of the two interfaces (such as Lightning, Micro-USB, or Type-C) are existing technologies, and the interface type is not limited here. Depending on the interface type, the number of other pins within the interface and the number of cores in the cable will vary accordingly. For example, a commonly used 4-core cable includes 2 data lines, 1 power line, and 1 ground line; a 5-core cable adds an audio line to the 4-core cable. The temperature protection circuit 20 mainly connects to the power pins of the two interfaces and the power lines in the cable. Figure 1 The power line (the thin line at the bottom) is shown separately from the other lines; no restrictions are placed on the other lines and interface pins here. The second interface contains a second connector J2 that is adapted to the first connector J1.

[0019] Please also refer to Figure 2 In this embodiment, a 4-core data cable is used as an example. The temperature protection circuit 20 includes a step-down module 21, a comparator module 22, and a switch module 23. The step-down module 21 is connected to the comparator module 22, the switch module 23, and the power supply pin of the second connector J2. The comparator module 22 is connected to the switch module 23, and the switch module 23 is connected to the power supply pin of the second connector J2 and the power supply pin of the first connector J1 through the power line in the cable. The step-down module 21 reduces the voltage transmitted by the second connector J2 and outputs a power supply to power the comparator module 22 and the switch module 23. The comparator module 22 outputs a corresponding high or low level control signal according to the temperature change inside the connector of the first interface, and the switch module 23 controls the on / off state (connection on and off) between the power line and the power supply pin of the first connector J1 according to the control signal.

[0020] The step-down module 21 includes a step-down chip U1, a first capacitor C1, and a second capacitor C2. The IN pin of the step-down chip U1 is connected to one end of the first capacitor C1 and is connected to the power pin VBUS_IN of the second connector J2 through the power line in the cable. The OUT pin of the step-down chip U1 is the power supply terminal of the temperature protection circuit 20 and is connected to one end of the second capacitor C2. The GND pin of the step-down chip U1, the other end of the first capacitor C1, and the other end of the second capacitor C2 are all grounded.

[0021] The step-down chip U1 is preferably an SGM2232, which steps down the voltage at the IN pin to output a 3.3V power supply to power the comparator module 22 and the switch module 23. The voltage range at the IN pin is 4V~20V, meeting the power input conversion requirements of different power supply devices. The first capacitor C1 (1uF, withstand voltage 50V) and the second capacitor C2 (4.7uF) are filter capacitors. A 100nF capacitor can also be connected in parallel with the second capacitor C2 to increase the stability of the power supply.

[0022] The comparison module 22 includes a comparator U2, an NTC resistor R0, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The NTC resistor R0 is disposed adjacent to the first socket J1. The IN+ pin of the comparator U2 is connected to one end of the first resistor R1, one end of the second resistor R2, and one end of the third resistor R3. The other end of the first resistor R1 is connected to the power supply terminal (i.e., the OUT pin of the step-down chip U1). The other end of the second resistor R2 and the V- pin of the comparator U2 are both grounded. The IN- pin of the comparator U2 is connected to one end of the NTC resistor R0. The other end of the NTC resistor R0 and the V+ pin of the comparator U2 are both connected to the power supply terminal. The OUT pin of the comparator U2 is connected to the other end of the third resistor R3, one end of the fourth resistor R4, and the switch module 23. The other end of the fourth resistor R4 is connected to the power supply terminal.

[0023] The comparator U2 is preferably a hysteresis comparator of model LMV331TP-CR. The resistance values ​​of the first resistor R1 to the fourth resistor R4 are all preferably 10KΩ. The NTC resistor R0 is preferably a negative temperature coefficient thermistor of model SDNT0603X104F4250FTF from Shunluo. The temperature-resistance correspondence table is based on existing technology. For example, the resistance is 30.58KΩ at 52℃, 100KΩ at 25℃, and 9.88KΩ at 82℃. The temperature change of the first connector J1 corresponds to the resistance change of the NTC resistor R0. The comparator U2 outputs corresponding high and low levels according to the resistance change of the NTC resistor R0 to control the on / off state of the switch module 23.

[0024] The high threshold of comparator U2 is calculated as follows: Under normal power supply, the voltage at the IN+ pin is higher than that at the IN- pin, and the OUT pin of comparator U2 outputs a high level, which is pulled up to 3.3V through R4. The equivalent circuit is: R3 and R4 are connected in series, then in parallel with R1, and then in series with R2; the formula for calculating the resistance value of the equivalent resistor RH is: RH=((R3+R4) / / R1)+R2=((10K+10K) / / 10K)+10K=50 / 3K; The formula for calculating the high threshold Uth is: Uth=3.3V / RH×R2=3.3V / (50 / 3)K ×10K = 1.98V.

[0025] When the temperature changes to the point where the voltage at the IN- pin (inverting input) exceeds 1.98V, the OUT pin undergoes a level shift from high to low. At this time, the low threshold of comparator U2 is calculated as follows: The equivalent circuit is: R3 and R2 are connected in parallel to ground, and then connected in series with R1; the formula for calculating the equivalent resistance RL is: RL=(R101 / / R106) +R105 =(10K / / 10K) +10K =15K; The formula for calculating the low threshold Utl is: Utl=3.3V / RL× (R101 / / R106) =3.3V / 15K × 5K =1.1V.

[0026] When the temperature changes to the point where the voltage at the IN-pin (inverting input) is less than 1.1V, the OUT pin undergoes another level transition, changing from low to high.

[0027] Preferably, the comparison module 22 further includes a fifth resistor R5 and a third capacitor C3. The fifth resistor R5 is connected between the IN- pin of comparator U2 and ground, and the third capacitor C3 is connected between the V+ pin of comparator U2 and ground. The fifth resistor R5 (preferably 15KΩ) is used to divide the voltage with the NTC resistor R0, pulling down the voltage on the IN- pin of comparator U2 under normal conditions to prevent U2 from misjudging. The third capacitor C3 is used to filter the power supply of comparator U2, making U2's operation more stable.

[0028] The switching module 23 includes a first switching transistor Q1, a second switching transistor Q2, a sixth resistor R6, and a seventh resistor R7. The gate G of the first switching transistor Q1 is connected to the OUT pin of the comparator U2, the source S of the first switching transistor Q1 is grounded, the drain D of the first switching transistor Q1 is connected to the gate G of the second switching transistor Q2 and one end of the seventh resistor R7 through the sixth resistor R6, the source (S and S1) of the second switching transistor Q2 is connected to the other end of the seventh resistor R7 and the power supply pin VBUS_IN of the second socket J2, and the drain (D1 to D5) of the second switching transistor Q2 is connected to the power supply pin VBUS_OUT of the first socket J1.

[0029] The first switch Q1 is preferably an N-channel enhancement MOS field-effect transistor (MOSFET) of model WNM2030A-3 / TR. The second switch Q2 is preferably a 12V-100V P-channel MOS transistor of model WM02P160R. When the gate G of the first switch Q1 is high, it conducts, pulling down the gate G of the second switch Q2 to a low level, turning Q2 on. At this time, the power supply pin VBUS_IN of the second connector J2 is connected to the power supply pin VBUS_OUT of the first connector J1 through the power line in the cable, and the data line is powered on. When the gate G of the first switch Q1 is low, it is cut off, and the gate G of the second switch Q2 is pulled up to a high level by R7, turning Q2 off. At this time, the power line is disconnected from the power supply pin VBUS_OUT of the first connector J1, and the data line is de-energized.

[0030] Please continue reading. Figure 1 and Figure 2The working principle of the data cable is as follows: At room temperature (25 degrees Celsius), the resistance of the NTC resistor R0 is 100KΩ. The formula for calculating the voltage U- at the IN- pin of U2 is: U-=R5×3.3V / (R5+R0)=15K×3.3V / (15K+100K)≈0.43V; When the voltage is less than 1.98V (the high threshold voltage Uth of comparator U2), U2 outputs a high level, Q1 turns on, and Q2 turns on, connecting the power supply line between the power supply equipment and the power receiving equipment, thus supplying power to the power receiving equipment.

[0031] When the temperature inside the socket of the first interface J2 rises due to various reasons (such as a micro-short circuit), the temperature of the adjacent NTC resistor R0 also rises. When the temperature rises to 82 degrees Celsius (the upper threshold), the resistance of NTC resistor R0 becomes 9.88KΩ. At this time, the voltage U- on the IN- pin of U2 is calculated using the following formula: U-=R5×3.3V / (R5+R0)=15K×3.3V / (15K+9.88K)≈1.989V; When the voltage is greater than 1.98V (high threshold Uth of comparator U2), U2 outputs a low level, Q1 is cut off, causing Q2 to be cut off and disconnected. The power supply line is disconnected from the power supply pin VBUS_OUT of the first connector J1, and the power supply to the powered device is disconnected.

[0032] After the power supply is disconnected, the temperature drops, causing the NTC resistor R0 to also decrease in temperature. When the temperature drops to 52 degrees Celsius (the lower threshold), the resistance of the NTC resistor R0 becomes 30.58K ohms. At this time, the voltage U- on the IN- pin of U2 is calculated using the following formula: U-=R5×3.3V / (R5+R0)=15K×3.3V / (15K+30.58K)≈1.08V; When the voltage is less than 1.1V, which is the low threshold voltage Utl of comparator U2, U2 outputs a high level. Q1 turns on, controlling Q2 to turn on, thus connecting the power supply line between the power supply equipment and the power receiving equipment, and restoring the power supply to the power receiving equipment.

[0033] In summary, the temperature-protected data cable provided by this utility model monitors the temperature of the first interface of the powered device in real time through a temperature protection circuit. When the temperature exceeds the upper threshold, it automatically disconnects the power supply to the powered device; when the temperature drops to the safe lower threshold, it automatically restores the power supply. Regardless of the operating state of the powered device, it can control the power supply based on the temperature, achieving automatic over-temperature power-off protection and automatic power restoration at low temperatures. This temperature protection circuit only connects to the power pins of the two interfaces and the power lines in the cable, without affecting other lines and pins in the data cable, making it applicable to different types of data cables and highly compatible.

[0034] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A data cable with temperature protection, comprising a cable, one end of which is provided with a first interface for connecting to a powered device, and the other end of which is provided with a second interface for connecting to a powered device, characterized in that, The housing of the first interface contains a circuit board, on which a temperature protection circuit and a first socket are provided; the temperature protection circuit is connected to the first socket and the second interface. When the temperature protection circuit detects that the temperature within the first interface is greater than the upper limit threshold, it disconnects the power supply to the powered device; when the temperature is less than or equal to the lower limit threshold, it restores the power supply to the powered device.

2. The data line with temperature protection according to claim 1, characterized in that, The temperature protection circuit includes a step-down module, a comparator module, and a switch module; the step-down module is connected to the comparator module, the switch module, and the power pin of the second socket in the second interface; the comparator module is connected to the switch module, and the switch module is connected to the power pin of the second socket and the power pin of the first socket through a power line in the cable; The step-down module reduces the voltage transmitted by the second connector and outputs a power supply to power the comparator module and the switching module. The comparison module outputs corresponding high and low level control signals based on the temperature change inside the socket of the first interface; The switching module controls the on / off state between the power line and the power pin of the first socket according to the control signal.

3. The data line with temperature protection according to claim 2, characterized in that, The step-down module includes a step-down chip, a first capacitor, and a second capacitor; The IN pin of the step-down chip is connected to one end of the first capacitor and is connected to the power pin of the second socket through the power line in the cable; the OUT pin of the step-down chip is the power supply terminal and is connected to one end of the second capacitor; the GND pin of the step-down chip, the other end of the first capacitor, and the other end of the second capacitor are all grounded.

4. The data line with temperature protection according to claim 3, characterized in that, The comparison module includes a comparator, an NTC resistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; The comparator's IN+ pin is connected to one end of the first resistor, one end of the second resistor, and one end of the third resistor; the other end of the first resistor is connected to the power supply terminal; the other end of the second resistor and the comparator's V- pin are both grounded; the comparator's IN- pin is connected to one end of the NTC resistor; the other end of the NTC resistor and the comparator's V+ pin are both connected to the power supply terminal; the comparator's OUT pin is connected to the other end of the third resistor, one end of the fourth resistor, and the switch module; the other end of the fourth resistor is connected to the power supply terminal.

5. The data cable with temperature protection according to claim 4, characterized in that, The NTC resistor is positioned adjacent to the first socket.

6. The data line with temperature protection according to claim 5, characterized in that, The comparison module also includes a fifth resistor and a third capacitor. The fifth resistor is connected between the IN- pin of the comparator and ground, and the third capacitor is connected between the V+ pin of the comparator and ground.

7. The data cable with temperature protection according to claim 5, characterized in that, The switching module includes a first switching transistor, a second switching transistor, a sixth resistor, and a seventh resistor; The gate of the first switching transistor is connected to the OUT pin of the comparator, the source of the first switching transistor is grounded, the drain of the first switching transistor is connected to the gate of the second switching transistor and one end of the seventh resistor through the sixth resistor, the source of the second switching transistor is connected to the other end of the seventh resistor and the power supply pin of the second socket, and the drain of the second switching transistor is connected to the power supply pin of the first socket.

8. The data cable with temperature protection according to claim 7, characterized in that, The first switch is an NMOS transistor, and the second switch is a PMOS transistor.

Images