Portable WiFi arrearage control device of single-port power bank

Abstract

The utility model relates to the technical field of portable WiFi, and provides a portable WiFi arrearage control device for a single-port power bank, and the device comprises a main control system, a charging chip, an operational amplifier chip, a joint detection module, a key control module, and a first TYPE connector, the output end of the charging chip is connected with the first TYPE connector, and the output end of the operational amplifier chip is connected with the first TYPE connector. The operational amplifier chip is connected between the output end of the first TYPE connector and the joint detection module, the joint detection module is connected between the output end of the operational amplifier chip and the main control system, the main control system is connected with the key control module, the key control module comprises an NMOS tube, the drain electrode of the NMOS tube is connected with the key pin of the charging chip, the source electrode of the NMOS tube is grounded, and the main control system is connected with the charging chip. The grid is connected with a control pin of the master control system. The device provided by the utility model adopts common materials such as the operational amplifier chip and the MOS tube, and has the advantages of low cost, high stability and strong practicability.

Description

Technical Field

[0001] This application relates to the field of portable WiFi technology, specifically to an overdue payment control device for a single-port portable WiFi power bank. Background Technology

[0002] Portable Wi-Fi devices are those that convert 2G, 3G, 4G, and 5G networks into Wi-Fi signals, meeting the network needs of business travelers and tourists who rely on mobile work. In addition to basic Wi-Fi functionality, an increasing number of portable Wi-Fi devices are also compatible with power bank functions; these devices are called portable Wi-Fi power banks.

[0003] However, portable WiFi devices powered by power banks are typically sold at extremely low prices, hoping users will top up their data accounts, thus gradually generating profit through data top-ups. The price of a portable WiFi device powered by a power bank with the same battery capacity is even lower than that of a regular power bank, leading many users to buy these devices simply to use them as power banks without topping up their data accounts, resulting in significant losses for the sellers. Utility Model Content

[0004] To help solve the above-mentioned technical problems, this application provides an overdue payment control device for a single-port portable WiFi power bank, which adopts the following technical solution:

[0005] A device for controlling overdue payments on a single-port portable WiFi power bank is disclosed. The device includes a main control system, a charging chip, an operational amplifier chip, a joint detection module, a button control module, and a first type connector. The output of the charging chip is connected to the first type connector. The operational amplifier chip is connected between the output of the first type connector and the joint detection module. The operational amplifier chip performs voltage following and impedance transformation on the output voltage of the charging chip. The joint detection module is connected between the output of the operational amplifier chip and the main control system, and is used to trigger the main control system to power on based on the boost state of the first type connector.

[0006] The main control system is connected to the button control module, which includes an NMOS transistor. The drain of the NMOS transistor is connected to the button pin of the charging chip, the source is grounded, and the gate is connected to the control pin of the main control system. The main control system is used to query the fee status and control the button pin of the charging chip according to the fee status through the control pin.

[0007] Preferably, the device further includes a second TYPE connector and a lithium battery, with the input terminal of the charging chip connected to the power terminal of the TYPE-C connector.

[0008] Preferably, the device further includes a voltage divider module connected between the output terminal of the charging chip and the operational amplifier chip, which is used to divide the output voltage of the charging chip.

[0009] Preferably, the charging chip is connected to a first inductor, a first resistor, a first capacitor, and a second capacitor. One end of the first inductor is connected to the switch pin of the charging chip, and the other end is connected to the first resistor and the second capacitor. One end of the first resistor is connected to the switch pin of the charging chip, and the other end is connected to the battery pin of the charging chip. One end of the first capacitor is connected to the battery pin of the charging chip, and the other end is grounded. One end of the second capacitor is connected to the first inductor, and the other end is grounded.

[0010] Preferably, the main control system is a 4G or 5G communication platform, the charging chip is IP5306, and the operational amplifier chip is RS121XF.

[0011] In summary, the device of this application uses common materials such as operational amplifier chips and MOSFETs, and has the advantages of low cost, high stability and strong practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of a single-port portable WiFi power bank overdue payment control device according to this application;

[0013] Figure 2 for Figure 1 The schematic diagram of the charging chip U1 in the embodiment shown is as follows;

[0014] Figure 3 for Figure 1 A schematic diagram of the operational amplifier chip U2 in the embodiment shown;

[0015] Figure 4 for Figure 1 The schematic diagram of the voltage divider module MODULE_1 in the embodiment shown is as follows;

[0016] Figure 5 for Figure 1 The diagram shows the structure of the joint detection module MODULE_2 in the embodiment shown.

[0017] Figure 6 for Figure 1 The schematic diagram of the button control module MODULE_3 in the embodiment shown is as follows;

[0018] Figure 7 for Figure 1 The schematic diagram of the TYPE-A connector in the embodiment shown is as follows;

[0019] Figure 8 for Figure 1 The schematic diagram of the TYPE-C connector in the embodiment shown is as follows;

[0020] Figure 9 for Figure 1 The schematic diagram of the main control system HOST1 in the embodiment shown. Detailed Implementation

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of one embodiment of a single-port portable WiFi power bank overdue payment control device according to this application. Figure 2 for Figure 1 The schematic diagram of the operational amplifier chip U2 in the illustrated embodiment is shown. Figure 3 for Figure 1 The schematic diagram of the voltage divider module MODULE_1 in the illustrated embodiment is shown. Figure 4 for Figure 1 The diagram shows the structure of the joint detection module MODULE_2 in the illustrated embodiment. Figure 5 for Figure 1 The schematic diagram of the button control module MODULE_3 in the embodiment shown. Figure 6 for Figure 1 The schematic diagram of the TYPE-A connector in the embodiment shown is as follows. Figure 7 for Figure 1 The schematic diagram of the TYPE-C connector in the embodiment shown is as follows. Figure 8 for Figure 1 The schematic diagram of the main control system HOST1 in the embodiment shown.

[0023] Combination Figures 1 to 8It is understood that the overdue payment control device for the single-port portable WiFi power bank of this application includes a main control system HOST1, a charging chip U1, an operational amplifier chip U2, a joint detection module MODULE_2, a button control module MODULE_3, a voltage divider module MODULE_1, a first TYPE connector (TYPE-A connector), a second TYPE connector (TYPE-C connector), and a lithium battery BAT1. The output terminal of the charging chip is connected to the first TYPE connector. The operational amplifier chip is connected between the output terminal of the first TYPE connector and the joint detection module. The operational amplifier chip is used to perform voltage following and impedance transformation on the output voltage of the charging chip. The joint detection module is connected between the output terminal of the operational amplifier chip and the main control system. It is used to trigger the main control system to power on according to the boost state of the first TYPE connector. The input terminal of the charging chip is connected to the power supply terminal of the second TYPE connector. The voltage divider module is connected between the output terminal of the charging chip and the operational amplifier chip. It is used to perform voltage division processing on the output voltage of the charging chip.

[0024] The main control system is connected to the button control module, which includes an NMOS transistor Q1. The drain of the NMOS transistor is connected to the button pin of the charging chip, the source is grounded, and the gate is connected to the control pin KEY_CTRL of the main control system. The main control system is used to query the fee status and control the button pin KEY of the charging chip according to the fee status.

[0025] The charging chip is connected to a first inductor L1, a first resistor R1, a first capacitor C1, and a second capacitor C2. One end of the first inductor L1 is connected to the switching pin SW of the charging chip, and the other end is connected to the first resistor and the second capacitor. One end of the first resistor is connected to the switching pin of the charging chip, and the other end is connected to the battery pin of the charging chip. One end of the first capacitor is connected to the battery pin KEY of the charging chip, and the other end is grounded. One end of the second capacitor is connected to the first inductor, and the other end is grounded. In this embodiment, the main control system is a 4G or 5G communication platform, the charging chip is an IP5306, and the operational amplifier chip is an RS121XF.

[0026] Figure 3 The circuit in the diagram is an operational amplifier configured as a voltage follower, with additional components for protection and signal distribution. Figure 3Operational amplifier U2 in the circuit is a dual-supply operational amplifier. Pin 5 is connected to the positive power supply (V+), and pin 2 is connected to the negative power supply (V-). Pin 3 is the inverting input (-IN), pin 4 is the non-inverting input (+IN), and pin 1 is the output (OUT). Two capacitors are included in the circuit, located between VOUT and VOUT_DET and VOUT_DIV, respectively. These capacitors are used for filtering or decoupling to stabilize the output voltage or detect the voltage. Operational amplifier U2 is configured as a voltage follower, meaning the non-inverting input (+IN) and the inverting input (-IN) are connected together and then connected to a feedback path to the output (OUT). This configuration ensures that the output voltage (VOUT) equals the input voltage (the voltage at the non-inverting input), resulting in high input impedance and low output impedance, and is commonly used for signal isolation and buffering.

[0027] Under normal conditions, the charging chip's VOUT pin has a detection voltage of approximately 2.5V, used to detect whether a load is connected to TYPE-A. Once a load is connected, the charging chip enters a boost state, and VOUT outputs 5V to charge the device, such as a mobile phone. To effectively control the output of TYPE-A, it is first necessary to detect whether TYPE-A is in a 5V boost state. Conventionally, the charging chip's VOUT voltage is directly connected to the VBUS_DET pin of the host system HOST1. Once the VBUS_DET pin of the host system HOST1 is triggered, the host system HOST1 will switch from a powered-off state to a powered-on state, then check whether the device is in arrears, and then decide whether to shut down the output of TYPE-A.

[0028] It should be noted that in the initial state of the device, the FLASH memory is filled with an arrears flag of "1" by default. After successful payment and recharge, network communication with the backend can be established, and the backend will send a notification to the device, rewriting the arrears flag in the FLASH memory to "0". When the arrears are about to occur, the backend will send a notification again, rewriting the arrears flag to "1". The main control system HOST1 can determine whether the device is in arrears by querying the arrears flag.

[0029] However, the VBUS_DET resistance to ground of HOST1 is usually very low, far below 500K ohms. If the charging chip's VOUT pin detects this low resistance, it interprets it as a load and incorrectly enters boost mode. Therefore, impedance transformation between VOUT and VBUS_DET is necessary. This can be achieved by using the operational amplifier chip U2 to form a voltage follower. This allows the host system HOST1 to receive the trigger signal and enter power-on mode, while ensuring that the low resistance of HOST1's VBUS_DET does not affect the load determination of VOUT.

[0030] The operational amplifier (op-amp) is powered via VOUT, and the trigger range of the main control system HOST1, VBUS_DET, is above 3.3V. Therefore, the range of the non-inverting input VOUT_DIV of the op-amp needs to be lower than the op-amp supply voltage VOUT, and it must satisfy 3.3V < VOUT_DIV when VOUT is 5V. Therefore, voltage division is required through the voltage divider module MODULE_1, and the sum of the resistor values ​​R4 and R5 in the voltage divider module must be greater than 500K ohms.

[0031] The inverting input terminal of the op-amp is connected to the output terminal of the op-amp to form a voltage follower. Its output voltage VOUT_DET=VOUT_DIV. The infinite input resistance of the voltage follower is utilized to prevent misjudgment by the charging chip.

[0032] When the TYPE-A port is connected to an actual load, VOUT_DET can eventually trigger the main control system HOST1 to power on via the Schottky diode D1 of the joint detection module MODULE_2. Then, it enters the recharge query action. Once it is found that the current device is in arrears, the KEY_CTRL signal is pulled high twice to simulate two short button presses, thus turning off the TYPE-A port output function of the power bank.

[0033] The button control module MODULE_3 consists of an NMOS transistor and a current-limiting resistor. Its drain is connected to the KEY signal of the charging chip U2. The KEY signal is usually shorted to ground once to enable the power bank's output function, and shorted to ground twice consecutively to disable the power bank's output function. Therefore, the main control system HOST1 can continuously pull the KEY_CTRL signal high twice to simulate two short button presses and turn off the power bank's TYPE-A port output function.

Claims

1. A single-port power bank with a portable WiFi device for controlling overdue charges, characterized in that, The device includes a main control system, a charging chip, an operational amplifier chip, a joint detection module, a button control module, and a first type connector. The output terminal of the charging chip is connected to the first type connector. The operational amplifier chip is connected between the output terminal of the first type connector and the joint detection module. The operational amplifier chip is used to perform voltage following and impedance transformation on the output voltage of the charging chip. The joint detection module is connected between the output terminal of the operational amplifier chip and the main control system, and is used to trigger the main control system to power on based on the boost state of the first type connector. The main control system is connected to the button control module, which includes an NMOS transistor. The drain of the NMOS transistor is connected to the button pin of the charging chip, the source is grounded, and the gate is connected to the control pin of the main control system. The main control system is used to query the fee status and control the button pin of the charging chip through the control pin according to the fee status.

2. The device according to claim 1, wherein, The device also includes a second TYPE connector and a lithium battery, with the input terminal of the charging chip connected to the power terminal of the second TYPE connector.

3. The device according to claim 1, wherein, The device also includes a voltage divider module, which is connected between the output terminal of the charging chip and the operational amplifier chip, and is used to divide the output voltage of the charging chip.

4. The apparatus according to claim 1, wherein, The charging chip is connected to a first inductor, a first resistor, a first capacitor, and a second capacitor. One end of the first inductor is connected to the switch pin of the charging chip, and the other end is connected to the first resistor and the second capacitor. One end of the first resistor is connected to the switch pin of the charging chip, and the other end is connected to the battery pin of the charging chip. One end of the first capacitor is connected to the battery pin of the charging chip, and the other end is grounded. One end of the second capacitor is connected to the first inductor, and the other end is grounded.

5. The apparatus according to claim 1, wherein, The main control system is a 4G or 5G communication platform, the charging chip is IP5306, and the operational amplifier chip is RS121XF.

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