Portable WiFi (Wireless Fidelity) device with USB (Universal Serial Bus) port burning prevention function

Abstract

The utility model relates to the technical field of portable WiFi, and provides a portable WiFi device with a USB port burning prevention function, the portable WiFi device comprises a main control system, an adapter module, a temperature sensing module and an active short circuit module, the temperature sensing module comprises a first resistor and a second resistor which are connected in series, one end of the second resistor is grounded, and the other end of the second resistor is grounded. The main control system is connected between the first resistor and the second resistor through an analog-to-digital conversion pin, the active short circuit module comprises an NMOS tube, a control pin of the main control system is connected with a grid electrode of the NMOS tube, a source electrode of the NMOS tube is grounded, and a drain electrode of the NMOS tube is connected with a power supply voltage interface of the adapter module; the second resistor is an NTC resistor. According to the portable WiFi device with the USB port anti-burning function, common materials such as the NMOS tube and the NTC resistor are adopted to form the stable, low-cost and high-practicability portable WiFi device with the USB port anti-burning function.

Description

A portable WiFi device with USB port burn-proof function Technical Field

[0001] This application relates to the field of portable WiFi technology, specifically to a portable WiFi device with USB port burn-proof function. Background Technology

[0002] The charging components of a portable WiFi device typically consist of a battery, a charging IC, and a USB female connector, with external accessories including a USB cable and adapter. As is well known, the charging process is a high-risk area, especially with USB female connectors and cables of varying quality. Poorly conductive pin materials and inferior pin workmanship can often lead to abnormal temperatures at the USB interface, causing it to melt and potentially even affecting the battery, resulting in more dangerous accidents. Summary of the Invention

[0003] To help solve the above-mentioned technical problems, this application provides a portable WiFi device with USB port burn-proof function, adopting the following technical solution:

[0004] A portable WiFi device with USB port burn-proof function, wherein the portable WiFi device includes a main control system, an adapter module, a temperature sensing module and an active short-circuit module. The temperature sensing module includes a first resistor and a second resistor connected in series. One end of the second resistor is grounded. The main control system is connected between the first resistor and the second resistor through an analog-to-digital conversion pin. The second resistor is located near the USB female connector. The active short-circuit module includes an NMOS transistor. The control pin of the main control system is connected to the gate of the NMOS transistor. The source of the NMOS transistor is grounded and the drain is connected to the power supply voltage interface of the adapter module.

[0005] The second resistor is an NTC resistor. The main control system uses the analog-to-digital converter pin to calculate the temperature value of the second resistor and uses the control pin to output a control signal to the gate of the NMOS transistor based on the temperature value. The power supply voltage interface of the adapter module is then controlled through the drain of the NMOS transistor.

[0006] Preferably, one end of the first resistor is connected to the voltage output pin of the main control system, and the voltage output pin is used to power the temperature sensing module.

[0007] Preferably, the analog-to-digital conversion pin is connected to an analog-to-digital converter, a third resistor, and a capacitor. The analog-to-digital conversion pin is connected between the first resistor and the second resistor through the analog-to-digital converter. One end of the third resistor is connected to the analog-to-digital converter, and the other end is grounded through the capacitor.

[0008] Preferably, the active short-circuit module includes a fourth resistor, a fifth resistor, and the NMOS transistor. One end of the fourth resistor is connected to the control pin, and the other end is connected to the gate of the NMOS transistor. One end of the fifth resistor is connected to the gate of the NMOS transistor, and the other end is grounded.

[0009] Preferably, the main control system is a 4G or 5G communication platform.

[0010] In summary, this application monitors the USB interface temperature in real time using an NTC resistor. When the temperature rises abnormally, the main control system actively triggers a short-circuit mechanism, using the adapter's own protection function to quickly cut off the power supply, effectively preventing the spread of high-temperature faults and significantly improving the safety of the charging process. Attached Figure Description

[0011] Figure 1 is a circuit diagram of the portable WiFi device of this application;

[0012] Figure 2 is a schematic diagram of the main control system of the embodiment shown in Figure 1;

[0013] Figure 3 is a schematic diagram of the adapter module of the embodiment shown in Figure 1;

[0014] Figure 4 is a schematic diagram of the temperature sensing module in the embodiment shown in Figure 1;

[0015] Figure 5 is a schematic diagram of the active short-circuit module of the embodiment shown in Figure 1. Detailed Implementation

[0016] The present application will be further described below with reference to the accompanying drawings. The structure and principle of the present application are very clear to those skilled in the art. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

[0017] Figure 1 is a circuit diagram of the portable WiFi device of this application; Figure 2 is a schematic diagram of the main control system of the embodiment shown in Figure 1; Figure 3 is a schematic diagram of the adapter module of the embodiment shown in Figure 1; Figure 4 is a schematic diagram of the temperature sensing module of the embodiment shown in Figure 1; and Figure 5 is a schematic diagram of the active short-circuit module of the embodiment shown in Figure 1.

[0018] Referring to Figures 1 to 5, the portable WiFi device of this application includes a main control system (HOST1), an adapter module (TYPE-C), a temperature sensing module (Module_1), and an active short-circuit module (Module_2). The temperature sensing module includes a first resistor (R1) and a second resistor (R2) connected in series. One end of the second resistor is grounded. The main control system is connected between the first and second resistors through an analog-to-digital conversion pin. The second resistor is located near the USB female connector, with a preset distance threshold of 3mm. The active short-circuit module includes an NMOS transistor (Q1). The control pin of the main control system is connected to the gate of the NMOS transistor. The source of the NMOS transistor is grounded, and the drain is connected to the power supply voltage interface (VBUS) of the adapter module.

[0019] The second resistor is an NTC resistor. The main control system uses the analog-to-digital converter pin to calculate the temperature value of the second resistor and uses the control pin (GPIO1) to output a control signal to the gate of the NMOS transistor based on the temperature value. The power supply voltage interface of the adapter module is controlled through the drain of the NMOS transistor.

[0020] One end of the first resistor is connected to the voltage output pin (V_1V8) of the main control system, which is used to power the temperature sensing module.

[0021] The analog-to-digital converter (ADC) pin is connected to the ADC, the third resistor (R3), and the capacitor (C1). The ADC pin is connected between the first and second resistors through the ADC. One end of the third resistor is connected to the ADC, and the other end is grounded through the capacitor.

[0022] The active short-circuit module includes a fourth resistor (R4), a fifth resistor (R5), and an NMOS transistor. One end of the fourth resistor is connected to the control pin, and the other end is connected to the gate of the NMOS transistor. One end of the fifth resistor is connected to the gate of the NMOS transistor, and the other end is grounded. The main control system is a 4G or 5G communication platform.

[0023] During charging, the VBUS pin receives voltage from the adapter, and this voltage signal notifies HOST1 (the main control system) to start. After HOST1 is powered on, the V_1V8 pin outputs 1.8V, which is dedicated to powering the temperature sensing module Module_1. In this module, R1 is a 10K fixed resistor, which forms a voltage divider circuit with R2 (NTC resistor QN0402X103F3380FB). The NTC resistor, or negative temperature coefficient thermistor, has a resistance that decreases as the temperature increases. This characteristic allows it to be used as a temperature sensor. One end of R2 is grounded, and the voltage value acquired by the ADC is the voltage value across R2.

[0024] When the temperature near the USB port changes, the resistance of R2 changes accordingly, causing a change in the voltage division ratio of R1 and R2, which in turn affects the voltage value collected by the ADC (Analog-to-Digital Converter). By reading the ADC value and combining it with the known voltage division relationship and the resistance-temperature reference table of R2, HOST1 can accurately calculate the actual temperature of R2, thereby indirectly monitoring the temperature near the USB female connector.

[0025] Under normal charging conditions, the temperature reading from HOST1 typically remains below 60 degrees Celsius. However, once the temperature approaches or reaches 100 degrees Celsius, this usually indicates an abnormality at the USB port, such as poor contact, short circuit, or overload. In this case, HOST1 will quickly take active short-circuit measures to protect the circuit and device.

[0026] The specific implementation process of the active short-circuit measure is as follows: When HOST1 detects an abnormal temperature, it outputs a high-level signal through the GPIO1 pin. This signal, after passing through the current-limiting resistor R4, controls the gate of the NMOS transistor (SSC8036GQ4), causing the NMOS transistor to be turned on. After the NMOS transistor is turned on, the VBUS pin is short-circuited to GND (ground), thereby generating a large instantaneous current. This large current will quickly trigger the adapter's internal short-circuit protection function, causing the adapter to enter a protection state and shut down the voltage output.

[0027] The SSC8036GQ4 NMOS transistor boasts a constant current capability of up to 18A and an instantaneous current capability of 102A, far exceeding the maximum output current of household adapters (typically 3A). Therefore, when the NMOS transistor actively enters a short-circuit state, it can safely trigger the adapter's short-circuit protection function without damaging the adapter or the circuitry. After the adapter shuts off its voltage output, the abnormal overheating at the USB interface is eliminated, effectively preventing the further spread and expansion of the high-temperature fault and ensuring the safety of the charging process.

Claims

1. A portable WiFi device with USB port burn-proof function, characterized in that, The portable WiFi device includes a main control system, an adapter module, a temperature sensing module, and an active short-circuit module. The temperature sensing module includes a first resistor and a second resistor connected in series, with one end of the second resistor grounded. The main control system is connected between the first and second resistors via an analog-to-digital converter pin. The distance between the second resistor and the USB female connector is less than a preset distance threshold. The active short-circuit module includes an NMOS transistor. The control pin of the main control system is connected to the gate of the NMOS transistor, the source of the NMOS transistor is grounded, and the drain is connected to the power supply voltage interface of the adapter module. The second resistor is an NTC resistor. The main control system calculates the temperature value of the second resistor via the analog-to-digital converter pin and outputs a control signal to the gate of the NMOS transistor via the control pin based on the temperature value. The drain of the NMOS transistor controls the power supply voltage interface of the adapter module.

2. The portable WiFi device according to claim 1, characterized in that, One end of the first resistor is connected to the voltage output pin of the main control system, which is used to power the temperature sensing module.

3. The portable WiFi device according to claim 1, characterized in that, The analog-to-digital conversion pin is connected to an analog-to-digital converter, a third resistor, and a capacitor. The analog-to-digital conversion pin is connected between the first resistor and the second resistor through the analog-to-digital converter. One end of the third resistor is connected to the analog-to-digital converter, and the other end is grounded through the capacitor.

4. The portable WiFi device according to claim 1, characterized in that, The active short-circuit module includes a fourth resistor, a fifth resistor, and the NMOS transistor. One end of the fourth resistor is connected to the control pin, and the other end is connected to the gate of the NMOS transistor. One end of the fifth resistor is connected to the gate of the NMOS transistor, and the other end is grounded.

5. The portable WiFi device according to claim 1, characterized in that, The main control system is a 4G or 5G communication platform.

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