Digital display monitoring device for fast charging data line

Abstract

The utility model relates to the technical field of charging monitoring of a charging line, and discloses a digital display monitoring device for a fast charging data line in order to solve the technical problems of overhigh temperature and low measurement precision during charging. Comprising a master control unit, a current sensor detection unit arranged at the positive electrode or the negative electrode of a power line, a VBUS voltage detection unit used for detecting the voltage of the power line, a display unit used for displaying electrical parameters, and a voltage reduction unit used for supplying power to the digital display monitoring device. The main control unit is respectively connected with the voltage reduction unit, the display unit, the VBUS voltage detection unit and the current sensor detection unit, the current sensor detection unit is a Hall sensor, and an E-MARK unit used for providing cable parameters for the main control unit is further arranged. Compared with the traditional resistance detection, the Hall sensor detects the current by sensing the change of the magnetic field, no extra heat is generated, the heating value is reduced, and meanwhile, the device has the advantages of high stability, accurate measurement, wide measurement range and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of charging line charging monitoring, in particular to a digital display monitoring device for a fast charging data line. Background Art

[0002] At present, most of the fast charging digital display data line controllers on the market adopt the double-resistance detection technology, which can display the current charging power and charging direction on the premise of bidirectional charging.

[0003] For example, the Chinese invention patent application document with the publication number CN117595420A discloses a bidirectional charging device. Paragraph

[0006] of the specification discloses that the bidirectional charging device includes a bidirectional current acquisition circuit, a control unit and a display module. The bidirectional current acquisition circuit includes a first resistor and a second resistor connected in series on the charging loop. The grounding point of the charging loop is connected between the first resistor and the second resistor. One end of the first resistor away from the second resistor outputs a positive sampling current, and one end of the second resistor away from the first resistor outputs a reverse sampling current. The control unit is respectively connected to the positive sampling current and the reverse sampling current, and controls the display module to display a positive charging indication when the positive sampling current is a positive voltage, and controls the display module to display a reverse charging indication when the reverse sampling current is a positive voltage.

[0004] This method has the following main disadvantages:

[0005] 1. When entering the high-power charging mode, the temperature of the circuit board and the wire casing is too high, and it may be hot to the touch, posing a safety hazard.

[0006] 2. Due to the certain error of the resistor itself, the measurement accuracy is inconsistent with the actual display accuracy.

[0007] 3. Due to the limitations in design, it can only test low-power applications and cannot be compatible with both high and low power applications, and the application range is relatively limited.

[0008] Therefore, it is particularly important to design a digital display monitoring device for a fast charging data line based on the technical requirements of low heat and high-precision bidirectional charging detection. Summary of the Utility Model

[0009] The purpose of the utility model is to provide a digital display monitoring device for a fast charging data line. By optimizing the circuit design, the problem of overheating is solved, and at the same time, the measurement accuracy is improved to ensure compatibility with high and low power applications, so that the fast charging digital display data line controller has a significant improvement in safety, accuracy and application range.

[0010] To achieve the above object, the utility model provides a digital display monitoring device for a fast charging data cable, which includes a main control unit, a current sensor detection unit disposed on the positive or negative pole of the power line, a VBUS voltage detection unit for detecting the voltage of the power line, a display unit for displaying electrical parameters, and a buck unit for supplying power to the digital display monitoring device. The main control unit is respectively connected to the buck unit, the display unit, the VBUS voltage detection unit, and the current sensor detection unit. The current sensor detection unit is a Hall sensor, and an E-MARK unit for providing cable parameters to the main control unit is also provided.

[0011] Using a Hall sensor as the current sensor detection unit, compared with the traditional resistance detection, the Hall sensor detects the current by sensing the change of the magnetic field, does not generate additional heat, thus effectively reducing the heat generation of the device during high-power charging, avoiding the phenomenon of getting hot, improving the safety, and at the same time having the advantages of high stability, accurate measurement, and wide measurement range.

[0012] The main control unit accurately controls the display content of the display unit according to the data obtained from the Hall sensor and the VBUS voltage detection unit. With the cable parameters provided by the E-MARK unit, the system can automatically adjust the output current according to the characteristics of different cables to avoid the heat generation problem of thin cables, and can also automatically adjust the measurement and display accuracy, thereby ensuring that the displayed electrical parameters are more accurate.

[0013] Through the E-MARK unit, the device can automatically identify and adapt to different types of fast charging data cables, enabling the monitoring device to maintain good compatibility in both high and low power applications. This expands the application range of the device, making it applicable not only to low-power charging but also to safely and accurately monitor high-power charging.

[0014] Further, the VBUS voltage detection unit includes a first resistor and a second resistor. The first end of the first resistor is connected to the positive pole of the power line, the second end of the first resistor is connected to the first end of the second resistor to form a voltage division node, the second end of the second resistor is connected to the negative pole of the power line, and the voltage division node is connected to the main control unit.

[0015] By setting the first resistor and the second resistor to form a voltage division circuit, a high-voltage signal can be converted into a low-voltage signal suitable for the main control unit to collect, ensuring that the main control unit can accurately read the voltage value. This voltage division method is both simple and reliable, can stably provide a voltage signal to the control unit, and the circuit structure is simple and easy to implement.

[0016] Further, a capacitor is also connected in parallel with the second resistor.

[0017] Connecting a capacitor in parallel with the second resistor can play a filtering role, smooth voltage fluctuations, and reduce the interference of high-frequency noise in the power line on the measurement accuracy. This design can further improve the stability and accuracy of voltage detection, ensure that the signal received by the main control unit is purer, and thus improve the performance of the overall system.

[0018] Furthermore, the buck unit is a linear voltage regulator module.

[0019] Using a linear voltage regulator module as the buck unit can provide a stable low-voltage power supply, with low output voltage ripple and noise, ensuring that the main control unit and other electronic components can operate normally under various working conditions.

[0020] Furthermore, one end of the charging connector of the fast charging data cable is a Type-C connector, and the other end is a Type-C connector or a USB-A connector.

[0021] The design that one end of the charging connector is a Type-C connector and the other end can be a Type-C or USB-A connector increases the compatibility of the fast charging data cable, enabling it to adapt to different types of devices and chargers. This dual-port design enhances the applicability and flexibility of the data cable, meeting the needs of different users.

[0022] Furthermore, the display unit is a surface-mounted LED digital tube, a micro TFT, or an OLED display screen.

[0023] Using a surface-mounted LED digital tube, a micro TFT, or an OLED display screen as the display unit provides users with multiple choices, enabling the device to select the most suitable display solution according to different application scenarios. The surface-mounted LED digital tube has low power consumption and low cost, and is suitable for simple applications; the micro TFT and OLED display screens can display richer information and are suitable for scenarios that require high resolution and multi-color display, enhancing the visibility and user experience of the device.

[0024] A digital display monitoring device for a fast charging data cable provided by the present utility model has the following advantages:

[0025] Compared with traditional resistance detection, the present utility model uses a high-precision current sensor to achieve high-precision detection of the current passing through the fast charging data cable. By detecting the change in the magnetic field to detect the current, no additional heat is generated, thereby effectively reducing the heat generation of the device during high-power charging, avoiding the phenomenon of getting hot, improving safety, and having the advantages of high stability, accurate measurement, and wide measurement range.

[0026] When the device is undergoing fast charging, it can visually view the relevant electrical parameters of the charging. The measured data parameters are highly stable and accurate. At the same time, the measurement range is large, and it can provide a fast charging control protocol that is compatible with current market standards for users. Through the design improvement of this circuit, the temperature can be controlled within a reasonable and safe range, and high current and high-speed data communication can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a block diagram of the implementation case for detecting the negative pole of the power supply provided by the present utility model;

[0028] Figure 2 It is a block diagram of the implementation case for detecting the positive pole of the power supply provided by the present utility model;

[0029] Figure 3 For the present utility model, Figure 2 circuit simplification schematic Figure 1 ;

[0030] Figure 4 For the present utility model, Figure 2 circuit simplification schematic Figure 2 ;

[0031] Figure 5 It is a bottom view of the internal physical structure of the digital display monitoring device provided by the present utility model;

[0032] Figure 6 It is a top view of the internal physical structure of the digital display monitoring device provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0034] Refer to Figure 1 and Figure 2 , the present utility model provides a digital display monitoring device for a fast charging data cable, including a main control unit, a current sensor detection unit arranged on the power line, a VBUS voltage detection unit for detecting the voltage of the power line, a display unit for displaying electrical parameters, and a step-down unit for supplying power to the digital display monitoring device. The main control unit is respectively connected to the step-down unit, the display unit, the VBUS voltage detection unit, and the current sensor detection unit. The current sensor detection unit is a Hall sensor, and an E-MARK unit for providing cable parameters to the main control unit is also provided.

[0035] The main control unit is an MCU, which uses its own AD data acquisition interface to convert the relevant parameters detected by the current sensor detection unit and output them to the display unit for display;

[0036] The current sensor detection unit connects the negative pole of the power supply of the Type-C or USB-A connector (see Figure 1 ) or the positive pole of the power supply (see Figure 2 ) input is connected to the current sensor detection unit, and sent to the main control unit for processing through the current sensor detection unit;

[0037] A display unit, used to display relevant electrical parameters calculated by the main control control unit;

[0038] The step-down unit is used to step down the VBUS power supply to 3.3V to supply power to the main control unit and the current sensor detection unit;

[0039] The E-MARK unit is used to store and identify the power transmission capacity and data transmission speed of the cable, ensuring that the cable can support high-speed charging and high-current transmission. At the same time, it standardizes the manufacturer's cable production specifications, improves the cable life, and brings a better user experience to consumers. The E-MARK unit ensures that the cable can meet the needs of high-speed charging and high-current transmission by marking the cable specifications, the maximum current and voltage supported, the USB signal type, etc. This is especially important for cables that support currents above 5A, high-speed transmission above USB 3.0, and video output functions. It can prevent interface damage caused by aging, looseness, and poor contact of the USB-C interface, and ensure the life and reliability of the cable. The main control unit can adjust the corresponding electrical performance parameters, such as output current, by reading the information inside the E-MARK unit.

[0040] The VBUS voltage detection unit is used to detect the power range on VBUS and send the relevant parameters of the voltage to the main control unit for conversion processing;

[0041] Hall sensor is used as the current sensor detection unit. Compared with traditional resistance detection, Hall sensor detects current by inducing changes in magnetic field and does not generate additional heat, thereby effectively reducing the heat generated by the device during high-power charging, avoiding the hot hand phenomenon and improving safety. It also has the advantages of high stability, accurate measurement and wide measurement range.

[0042] The main control unit accurately controls the display content of the display unit based on the data obtained from the Hall sensor and the VBUS voltage detection unit. In conjunction with the cable parameters provided by the E-MARK unit, the system can automatically adjust the output current according to the characteristics of different cables to avoid heating problems of small cables, and can also automatically adjust the measurement and display accuracy to ensure that the displayed electrical parameters are more accurate.

[0043] Through the E-MARK unit, the device can automatically identify and adapt to different types of fast charging data cables, enabling the monitoring device to maintain good compatibility in both low-power and high-power applications. This expands the application scope of the device, making it applicable not only to low-power charging but also capable of safely and accurately monitoring high-power charging.

[0044] Refer to Figure 3 and Figure 4 , which is the simplified circuit diagram provided for the present utility model based on Figure 2 Specifically, Figure 3 is based on QC2.0, Figure 4 is based on QC4.0. The display unit and the E-MARK unit are not shown. Among them, U2 is the MCU, U4 is the buck unit, U5 is the USB-A connector, L2B is the Hall sensor, J1 is the USB-A connector, and J2 is the Type-C connector.

[0045] The 3rd terminal of the current detection sensor is the VREF pin, and the 4th terminal is the Vout pin. The VREF pin can be used as a reference power supply, and the Vout pin is used to output voltage.

[0046] 1. When VREF is in the output mode:

[0047] Vout represents the output voltage

[0048] Ps represents the sensitivity

[0049] The dielectric constant corresponding to the nominal supply voltage is represented by ε;

[0050] The calculation formula is:

[0051] Vout = ε + IP(A) × Ps(mV)

[0052] 2. When VREF is in the input mode: (0V ≤ VREF ≤ 4V)

[0053] Vout represents the output voltage;

[0054] Ps represents the sensitivity;

[0055] The calculation formula is:

[0056] Vout = VREF + IP(A) × Ps(mV)

[0057] Its basic principle is as follows:

[0058] When the current increases, Vout increases until it reaches the saturation voltage of the output op-amp (VCC - rail voltage); when the current decreases, Vout decreases until it reaches the lower saturation voltage of the output op-amp (GND + rail voltage). To ensure that Vout is within the range of 0.5 - 4.5V or 0.33 - 2.97V, the sensor maintains good accuracy and linearity. When the input current exceeds the range, Vout will approach the rail voltage of the power supply. When the input current does not exceed the tolerance limit of the sensor, even if Vout reaches the rail voltage, it can still work properly. When the input current returns to the range, the output of Vout will also return to normal without causing any damage to the sensor.

[0059] Figure 3 In the illustrated embodiment, the current detection sensor is disposed in the positive line of the power supply line. It is also possible to dispose the current detection sensor in the negative line of the power supply line, i.e., to detect the current in the ground wire.

[0060] The VBUS voltage detection unit includes a first resistor R30 and a second resistor R29. The first end of the first resistor R30 is connected to the positive pole of the power supply line, i.e., the VBUS line. The second end of the first resistor R30 is connected to the first end of the second resistor R29 to form a voltage division node. The second end of the second resistor R29 is connected to the negative pole of the power supply line, i.e., the ground. The voltage division node is connected to the main control unit through the resistor R1.

[0061] By setting the first resistor R30 and the second resistor R29 to form a voltage division circuit, a high-voltage signal can be converted into a low-voltage signal suitable for the main control unit to collect, ensuring that the main control unit can accurately read the voltage value. This voltage division method is both simple and reliable, can stably provide a voltage signal to the control unit, and has a simple circuit structure and is easy to implement.

[0062] Further, a capacitor C9 is also connected in parallel with the second resistor R29.

[0063] Connecting a capacitor in parallel with the second resistor R29 can play a filtering role, smooth the voltage fluctuation, and reduce the interference of high-frequency noise in the power supply line on the measurement accuracy. This design can further improve the stability and accuracy of voltage detection, ensure that the signal received by the main control unit is purer, and thus improve the performance of the overall system.

[0064] Further, the buck unit is a linear voltage regulator module.

[0065] Using a linear voltage regulator module as the buck unit can provide a stable low-voltage power supply, with low output voltage ripple and noise, ensuring that the main control unit and other electronic components can operate normally under various working conditions.

[0066] Further, one end of the charging connector of the fast charging data cable is a Type-C connector, and the other end is a Type-C connector or a USB-A connector.

[0067] The design that one end of the charging connector is a Type-C connector and the other end can be a Type-C or USB-A connector increases the compatibility of the fast charging data cable, enabling it to adapt to different types of devices and chargers. This dual-port design enhances the applicability and flexibility of the data cable, meeting the needs of different users.

[0068] Further, the display unit is a surface-mounted LED digital tube, a micro TFT or an OLED display screen.

[0069] Using a surface-mounted LED digital tube, a micro TFT or an OLED display screen as the display unit provides users with multiple options, enabling the device to select the most suitable display solution according to different application scenarios. The surface-mounted LED digital tube has low power consumption and low cost, and is suitable for simple applications; the micro TFT and OLED display screens can display richer information and are suitable for scenarios that require high resolution and multi-color display, enhancing the visibility and user experience of the device.

[0070] The Type-C or USB-A connector is mainly used for connecting external devices and is a standard protocol interface.

[0071] Refer to Figure 4 and Figure 5 , the digital display monitoring device is preferably arranged at the charging connector.

[0072] In addition, a high-speed QC4.0 module is also provided in the circuit, which supports the Quick Charge 4.0 function. It not only supports high-current charging but also enables high-speed data communication, and is compatible with protocol standards such as PD2.0, PD3.0, PD3.1, and PD4.0 at the same time. In addition, this module is also compatible with multiple fast charging protocols, including QC, FCP, SCP, VOOC, TurboCharge, FlashCharge, AFC, and PE, ensuring efficient charging and data transmission under various devices and charging standards.

[0073] By intelligently adjusting the charging voltage and current to optimize the charging efficiency, a faster charging speed is achieved while ensuring the safety of the device. In addition, the QC4.0 module can monitor the temperature during the charging process and make adjustments to avoid overheating of the device, thereby enhancing the safety of charging. It also supports bidirectional charging, which can not only quickly charge the device but also charge other devices in reverse, providing a more flexible usage method.

[0074] A digital display monitoring device for a fast charging data cable provided by the present utility model has the following advantages:

[0075] By adopting a high-precision Hall current sensor to replace the traditional resistance detection method, the accuracy, stability, and measurement range of current detection are significantly improved. The Hall sensor measures the current by sensing the change in the magnetic field, without generating additional heat, effectively reducing the heat generated by the device during high-power charging, enhancing safety, and avoiding the phenomenon of getting burned. At the same time, this device integrates a VBUS voltage detection unit, a display unit, and an E-MARK unit, achieving precise monitoring and display of current, voltage, power, and fast charging mark during the charging process. The main control unit can automatically adjust the output current according to the electrical parameters detected by the E-MARK unit, avoid the problem of overheating of thin cables, and adjust the measurement and display accuracy to ensure that the displayed parameters are more accurate. This device has strong compatibility, can adapt to different types of fast charging data cables, supports applications with high and low power, and expands the scope of use.

[0076] This utility model can intuitively display various electrical parameters during the fast charging process, and users can easily view the current, voltage, power, and the identification situation of the fast charging mark during charging. This digital display monitoring device detects the positive or negative pole of the power supply on the charging cable, precisely measures it using a current sensor, and clearly displays these parameters (such as current, voltage, power, and fast charging signal) on an LED digital tube, TFT, or OLED screen, facilitating users to monitor the charging status in real time.

[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A digital display monitoring device for a fast charging data cable, comprising a main control unit, a current sensor detection unit arranged on the positive or negative pole of the power line, a VBUS voltage detection unit for detecting the voltage of the power line, a display unit for displaying electrical parameters, and a buck unit for supplying power to the digital display monitoring device, characterized in that The master control unit is respectively connected to a buck unit, a display unit, a VBUS voltage detection unit, and a current sensor detection unit. The current sensor detection unit is a Hall sensor, and an E-MARK unit for providing cable parameters to the master control unit is also provided.

2. The digital display monitoring device for a fast charging data cable according to claim 1, characterized in that, The VBUS voltage detection unit includes a first resistor and a second resistor. The first end of the first resistor is connected to the positive pole of the power line, the second end of the first resistor is connected to the first end of the second resistor to form a voltage division node, and the second end of the second resistor is connected to the negative pole of the power line. The voltage division node is connected to the master control unit.

3. The digital display monitoring device for a fast charging data cable according to claim 2, characterized in that, A capacitor is also connected in parallel with the second resistor.

4. A digital display monitoring device for a fast charging data cable according to claim 1, characterized in that, The buck unit is a linear voltage regulator module.

5. The digital display monitoring device for a fast charging data cable according to claim 1, characterized in that, One end of the charging connector of the fast charging data cable is a Type-C connector, and the other end is a Type-C connector or a USB-A connector.

6. The digital display monitoring device for a fast charging data cable according to claim 1, characterized in that, The display unit is a surface mount LED digital tube, a micro TFT, or an OLED display screen.

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