A dual-path fast charging device

Abstract

This utility model relates to the field of charging dock technology, specifically a dual-channel fast charging device that solves the problems of low power, slow charging, poor compatibility, and insufficient safety protection in existing charging solutions. It includes a housing, a base plate, a dual-battery charging compartment, a main control board, and an indicator light motherboard. The main control board integrates two main charging chips U1, an MCU controller U5, and an interface switching circuit. The housing has a DC interface and a TYPE-C interface, which are switched without conflict via a relay. The main charging chips, combined with an adjustable resistor, can switch the battery type and the number of cells in series purely through hardware. The indicator light uses a dual-color timing indicator, and the MCU implements quadruple safety protection via an I2C bus. This device has a total dual-channel power of 60W, shortens the single-charge time, supports domestic substitution and wide-temperature range operation, improves the efficiency of inspection equipment, and combines compatibility, safety, and convenience, making it suitable for scenarios such as power inspection.

Description

Technical Field

[0001] This utility model relates to the field of charging base technology, and in particular to a dual-channel fast charging device. Background Technology

[0002] In the field of power line inspection, the endurance of intelligent inspection equipment, such as drones equipped with infrared thermal imaging modules, directly determines operational efficiency and safety. Existing charging solutions suffer from several technical bottlenecks: First, single-channel charging power is generally below 15W, with a single charge taking 3-5 hours, resulting in less than 4 hours of effective daily operation for inspection equipment, severely restricting inspection timeliness. Second, reliance on imported power management chips, such as the TIBQ series, not only keeps BOM costs high but also results in a supply cycle of 12-16 weeks, posing a risk of supply disruption. Third, the dual-input interfaces lack an effective coordination mechanism, easily leading to power supply conflicts and overload issues when connected simultaneously. Fourth, charging efficiency drops by more than 40% under extreme environments, and the protection mechanism is inadequate, lacking comprehensive protection against battery temperature, chip overheating, and overcharging. These problems result in standby time exceeding 30%, severely impacting the reliability and emergency response capabilities of power line inspection. Therefore, a highly efficient, compatible, and safe dual-channel fast charging device is urgently needed. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0004] Design a dual-channel fast charging device, including a housing and a base plate fixed to the bottom of the housing. Battery charging compartments are respectively opened on the top two sides of the housing. Each battery charging compartment has a set of battery contacts. An indicator light is provided on the top of the housing between the two battery compartments. A main control board and an indicator light main board are respectively provided at the upper and lower ends of the housing. The indicator light main board is electrically connected to the indicator light. The main control board integrates two independent charging main chips U1, an MCU controller U5, and an interface switching circuit. Each set of battery contacts is electrically connected to the corresponding charging main chip U1. The indicator light main board is electrically connected to the two charging main chips U1. The two charging main chips U1 are communicatively connected to the MCU controller U5.

[0005] A DC interface and a TYPE-C interface are respectively provided on the lower part of the front side of the housing. The DC interface and the TYPE-C interface are electrically connected to the charging main chip U1 and the interface switching circuit, respectively.

[0006] Furthermore, a counterweight is attached to the housing above the bottom plate.

[0007] Furthermore, the interface switching circuit includes a relay KA1, a transistor Q9, and a transistor Q12. The base of transistor Q9 is connected to voltage divider resistors R25 and R26, which are connected in series to the enable output terminal VCC5.0V_EN of the MCU controller U5. The emitter of transistor Q9 and voltage divider resistor R25 are both connected to the ground terminal. The collector of transistor Q9 is connected to one end of the coil of relay KA1, and the other end of the coil of relay KA1 is connected to the external VCC5.0V power supply terminal.

[0008] The base of transistor Q12 is connected to voltage divider resistors R39 and R37, which are connected in series. One end of voltage divider resistor R39 is grounded, and one end of voltage divider resistor R37 is connected to the TYPE-C interface and the normally open contact 5 of relay KA1. The collector of transistor Q12 is connected to bias resistor R30 and current limiting resistor R35. The other end of bias resistor R30 is connected to the external VCC 3.3V power supply terminal, and one end of current limiting resistor R35 is connected to the analog acquisition terminal VCC_detection of MCU controller U5.

[0009] The normally closed contact 3 of the relay KA1 is connected to the DC interface, and the common contact 4 of the relay KA1 is connected to the VBUS power supply input terminals of the two charging main chips U1 respectively.

[0010] Furthermore, the indicator lights include a single-color power indicator light and two dual-color charging indicator lights. Each battery charging compartment corresponds to one dual-color charging indicator light. Each dual-color charging indicator light consists of a red light and a green light. When charging, the red light is constantly on, and when fully charged, the green light is constantly on. When no battery is detected and there is a battery inside the charging compartment, the indicator light flashes alternately with the red light constantly on for 8 seconds and the green light constantly on for 1 second.

[0011] Furthermore, the two main charging chips U1 are equipped with regulating resistors R19, R41 and R17, R40 respectively. The resistance values ​​of the regulating resistors R19 and R41 can switch between ternary lithium charging mode and lithium iron phosphate charging mode; the regulating resistors R17 and R40 can be set to a 2-5 battery series charging mode.

[0012] Furthermore, the main charging chip U1 integrates an input voltage regulation loop, which automatically reduces the charging current to regulate voltage when the input voltage approaches the undervoltage threshold; it also integrates input overvoltage protection and NTC temperature adaptation functions, and works with NTC resistors R20 and R42 to achieve abnormal battery temperature protection.

[0013] Furthermore, the MCU controller U5 communicates with the two charging main chips U1 via the I2C bus. The MCU controller U5 obtains the battery temperature by monitoring the voltage of the resistor RT1 to realize abnormal battery temperature protection, reads the battery fuel gauge data through the I2C bus to realize 48H charging timeout protection, and obtains the temperature of the charging main control chip U1 by monitoring the voltage of the resistor RT2 to realize over-temperature protection.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model adopts the Ingenic IP2363 dual-charging main chip architecture, with a maximum output of 30W per channel and a total power of 60W for both channels. It reduces the charging time per charge, supports simultaneous charging of inspection equipment and backup batteries, increases daily working hours, and completely solves the pain point of slow charging in traditional systems.

[0016] 2. Through the interface switching circuit of relay and transistor, the DC and TYPE-C interfaces can be automatically identified and switched without manual operation, avoiding power supply conflicts and overloads, adapting to different power supply scenarios such as mains power and power bank, and improving the flexibility of use.

[0017] 3. This application adopts a battery-not-plugged indication mechanism that alternates between a red light flashing for 8 seconds and a green light flashing for 1 second. Combined with the design of a constant red light during charging and a constant green light when fully charged, it can still be clearly identified under strong light. The four protection mechanisms, such as NTC battery temperature protection, chip over-temperature protection, input over-voltage protection, timeout protection, and input voltage regulation loop, ensure safe and stable charging under extreme environments and prevent adapter damage and equipment damage.

[0018] 4. The housing of this application is small in size and light in weight, and the bottom is designed to fit a counterweight, which effectively balances the center of gravity when the dual battery compartments are fully loaded, prevents charging interruption caused by tipping over, and improves the stability of outdoor use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a top view of the structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0022] Figure 4 and Figure 5 This is a circuit block diagram of this utility model;

[0023] Figure 6 This is the circuit diagram of the main control chip;

[0024] Figure 7 This is the circuit diagram of the MCU controller;

[0025] Figure 8 This is an interface switching circuit diagram;

[0026] Figure 9 This is the circuit connection diagram for the indicator light board;

[0027] The numbers in the diagram are: 1. Housing, 2. DC interface, 3. TYPE-C interface, 4. Battery charging compartment, 5. Power indicator light, 6. Charging indicator light, 7. Battery contacts, 8. Indicator motherboard, 9. Main control board, 10. Counterweight, 11. Base plate. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Example 1

[0030] A dual-channel fast charging device, such as Figures 1 to 9 As shown, the device includes a housing 1 and a base plate 11 fixed to the bottom of the housing 1. Battery charging compartments 4 are respectively provided on the top two sides inside the housing 1. Each battery charging compartment 4 is provided with a set of battery contacts 7. An indicator light is provided on the top of the housing 1 between the two battery compartments. The upper and lower ends of the housing 1 are respectively provided with a main control board 9 and an indicator light main board 8. The indicator light main board 8 is electrically connected to the indicator light. The main control board 9 integrates two independent charging main chips U1, an MCU controller U5, and an interface switching circuit. Each set of battery contacts 7 is electrically connected to the corresponding charging main chip U1. The indicator light main board 8 is electrically connected to the two charging main chips U1. The two charging main chips U1 are communicatively connected to the MCU controller U5.

[0031] The lower front side of the housing 1 has a DC interface 2 and a TYPE-C interface 3, which are electrically connected to the two main charging chips U1 and the interface switching circuit, respectively. The DC interface is connected to a DC power connector, and the TYPE-C interface is connected to a TYPE-C connector.

[0032] The charging main chip U1 is specifically model Ingenic IP2363 (maximum output of 30W per chip, supporting PD3.0 / PPS / UFCS multi-protocol); the MCU controller U5 is specifically model HC32L110C6UA-SFN20TR; the DC interface uses XKBConnection DC power socket (2mm inner diameter, 6.2mm outer diameter), and the TYPE-C interface uses Korean Hanyoung TYPE-C-31-M-31; the VBUS terminals of the two charging main chips share an interface switching circuit to achieve dual-channel synchronous power supply.

[0033] This application constructs a hardware architecture for dual-path independent fast charging, solving the technical bottlenecks of insufficient charging power (below 15W) and slow charging speed (3-5 hours) of traditional single-path charging; it supports DC and TYPE-C dual input modes, adapting to different power supply environments in scenarios such as power inspection; it adopts domestically produced core chips (IP2363+HC32L110) to replace imported TIBQ series chips, solving the problems of high cost and long delivery cycle (12-16 weeks).

[0034] The above features dual-channel independent fast charging, with a maximum output of 30W per channel and a total power of 60W for both channels. The charging time for a single charge is reduced to within 1.5 hours. It supports simultaneous charging of inspection equipment and backup batteries, increasing daily operating time by more than 50%. The dual input interfaces are compatible with different power supply scenarios such as AC power and power banks, improving usage flexibility. The domestic chip architecture reduces BOM costs by 40%, avoids the risk of imported chip supply disruptions, and has passed GB / T9254-2023 electromagnetic compatibility certification, reducing electromagnetic interference.

[0035] A counterweight 10 is attached to the top of the base plate 11 inside the housing 1. The weight of the counterweight 10 needs to match the center of gravity balance requirements when the dual battery compartments are fully loaded, so as to improve the stability of the device. Even when the dual batteries are being charged or the batteries are being plugged in or out at the same time, the device can remain stable, avoiding charging interruption or contact wear caused by tipping over, and ensuring the continuity and safety of the charging process.

[0036] The interface switching circuit includes relay KA1, transistor Q9, and transistor Q12. The base of transistor Q9 is connected to voltage divider resistors R25 and R26. Voltage divider resistors R25 and R26 are connected in series to the enable output terminal VCC5.0V_EN of MCU controller U5. The emitter of transistor Q9 and voltage divider resistor R25 are both connected to the ground terminal. The collector of transistor Q9 is connected to one end of the coil of relay KA1. The other end of the coil of relay KA1 is connected to the external VCC5.0V power supply terminal.

[0037] The base of transistor Q12 is connected to voltage divider resistors R39 and R37, which are connected in series. One end of voltage divider resistor R39 is grounded, and one end of voltage divider resistor R37 is connected to TYPE-C interface 3 and normally open contact 5 of relay KA1. The collector of transistor Q12 is connected to bias resistor R30 and current limiting resistor R35. The other end of bias resistor R30 is connected to the external VCC 3.3V power supply terminal, and one end of current limiting resistor R35 is connected to the analog acquisition terminal VCC_detection of MCU controller U5.

[0038] The normally closed contact 3 of relay KA1 is connected to DC interface 2, and the common contact 4 of relay KA1 is connected to the VBUS power supply input terminals of the two charging main chips U1 respectively.

[0039] The interface switching logic is as follows: Initially, DC interface 2 is powered. When TYPE-C interface 3 is connected, the output terminal VCC5.0V_EN of MCU controller U5 outputs a high level, transistor Q9 conducts, energizing the coil of relay KA1, thus closing the normally open contacts 4-5 of the relay, i.e., switching to TYPE-C interface 3 for power input. At this time, transistor Q12 conducts, and its collector level is pulled low. When the acquisition terminal VCC-detection of MCU controller U5 detects a low level, it indicates that TYPE-C interface 3 is connected to power, thus ensuring no power supply conflict. TYPE-C interface 3 (TYPE-C-31-M-31) is connected to the detection and fast charging communication pin CC2, the fast charging intelligent identification pins DPC and DMC of the charging main chip U1 through its pins B5 (CC1), B6 ​​(USB-DP), and B7 (USB-DN), respectively.

[0040] The above technical solution achieves conflict-free collaborative power supply between DC and TYPE-C dual input interfaces, resolving the technical problems of overload and power supply conflict that are prone to occur in traditional dual input interfaces. It automatically identifies the connected input interface, eliminating the need for manual switching; improves power supply safety and ease of use; and the combination circuit of relays and transistors offers fast response speed and short switching delay time, thus ensuring fast charging efficiency.

[0041] The indicator lights include one single-color power indicator light 5 and two dual-color charging indicator lights 6. The single-color power indicator light 5 is electrically connected to the DC interface and the TYPE-C interface respectively. Each battery charging compartment 4 corresponds to one dual-color charging indicator light 6. Each dual-color charging indicator light 6 consists of a red light and a green light. The red light is always on when charging and the green light is always on when fully charged. When no battery is detected in the battery charging compartment 4, the dual-color charging indicator light 6 flashes alternately with the red light on for 8 seconds and the green light on for 1 second, forming a clear "not installed properly" prompt signal.

[0042] In the above solutions, users can quickly determine the status through the lights: a solid red light means charging, a solid green light means fully charged, and alternating flashing means no battery is inserted or improperly installed. The sequential flashing indicator when no battery is installed is unique, avoiding user misjudgment, reducing charging failures due to improper installation, and improving operational convenience. The dual-color light display design is suitable for outdoor inspection scenarios and can still be clearly identified under strong light, improving environmental adaptability.

[0043] The main charging chip U1 has adjustable resistors R19 and R17. Adjusting the resistance value of resistor R19 switches between ternary lithium charging mode (4.20V±1%) and lithium iron phosphate charging mode (3.65V±0.5%). When the charging power is 20W, a resistance of 3.6KΩ indicates lithium iron phosphate charging mode, and a resistance of 6.2KΩ indicates ternary lithium charging mode. Specifically, when the charging power is 30W, a resistance of 9.1KΩ indicates lithium iron phosphate charging mode. In the lithium iron phosphate (LiFePO4) charging mode, when resistor R19 is 13K ohms, it is in ternary lithium charging mode. Adjusting resistor R17 can set the charging mode for 2-5 batteries in series. Specifically, when the resistance of resistor R17 is 3.6K ohms, it is in the charging mode for 2 batteries in series; when the resistance of resistor R17 is 6.2K ohms, it is in the charging mode for 3 batteries in series; when the resistance of resistor R17 is 9.1K ohms, it is in the charging mode for 4 batteries in series; and when the resistance of resistor R17 is 13K ohms, it is in the charging mode for 5 batteries in series.

[0044] The above technical solutions do not require additional charger or accessory replacements. They can be adapted to two mainstream battery types, ternary lithium and lithium iron phosphate, simply by adjusting the hardware resistor. They support charging 2-5 series-connected batteries, covering battery specifications of different devices such as inspection drones and handheld terminals. The pure hardware switching has no software dependency, resulting in fast response and high stability. It avoids charging failures caused by software configuration errors and expands the application scenarios of the device.

[0045] The main charging chip U1 integrates an input voltage regulation loop. When the input voltage approaches the undervoltage threshold, it automatically reduces the charging current to regulate the voltage, ensuring the input voltage remains stable near the undervoltage threshold and preventing adapter failure. It also integrates input overvoltage protection; when the input voltage exceeds the overvoltage threshold, charging stops. Furthermore, it features NTC temperature adaptation, working with NTC resistors R20 and R42 to protect against abnormal battery temperatures. Charging can be stopped if the battery temperature is detected to be too high or too low.

[0046] The MCU controller U5 communicates with the two charging main chips U1 via an I2C bus. The MCU controller U5 obtains the battery temperature by monitoring the voltage of resistor RT1 to implement abnormal battery temperature protection. When the battery temperature is detected to be too high or too low, charging can be stopped. Combined with an NTC resistor, dual monitoring can be achieved to ensure normal charging. It also reads battery fuel gauge data via the I2C bus to implement 48-hour charging timeout protection; that is, if charging has not been completed within 48 hours, charging will be forcibly stopped. Furthermore, it obtains the temperature of the charging main control chip U1 by monitoring the voltage of resistor RT2 to implement over-temperature protection; when the MCU controller U5 detects that the chip temperature exceeds 125 degrees Celsius, charging will be forcibly stopped.

[0047] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-channel fast charging device, characterized in that, The device includes a housing and a base plate fixed to the bottom of the housing. Battery charging compartments are provided on both sides of the top of the housing. Each battery charging compartment has a set of battery contacts. An indicator light is provided on the top of the housing between the two battery compartments. A main control board and an indicator light main board are provided at the upper and lower ends of the housing, respectively. The indicator light main board is electrically connected to the indicator lights. The main control board integrates two independent charging main chips U1, an MCU controller U5, and an interface switching circuit. Each set of battery contacts is electrically connected to the corresponding charging main chip U1. The indicator light main board is electrically connected to the two charging main chips U1. The two charging main chips U1 are communicatively connected to the MCU controller U5. A DC interface and a TYPE-C interface are respectively provided on the lower part of the front side of the housing. The DC interface and the TYPE-C interface are electrically connected to the charging main chip U1 and the interface switching circuit, respectively.

2. The dual-channel fast charging device as described in claim 1, characterized in that: A counterweight is attached to the inside of the housing above the bottom plate.

3. The dual-channel fast charging device as described in claim 1, characterized in that: The interface switching circuit includes a relay KA1, a transistor Q9, and a transistor Q12. The base of transistor Q9 is connected to voltage divider resistors R25 and R26. Voltage divider resistors R25 and R26 are connected in series to the enable output terminal VCC5.0V_EN of MCU controller U5. The emitter of transistor Q9 and voltage divider resistor R25 are both connected to the ground terminal. The collector of transistor Q9 is connected to one end of the coil of relay KA1. The other end of the coil of relay KA1 is connected to the external VCC5.0V power supply terminal. The base of transistor Q12 is connected to voltage divider resistors R39 and R37, which are connected in series. One end of voltage divider resistor R39 is grounded, and one end of voltage divider resistor R37 is connected to the TYPE-C interface and the normally open contact 5 of relay KA1. The collector of transistor Q12 is connected to bias resistor R30 and current limiting resistor R35. The other end of bias resistor R30 is connected to the external VCC 3.3V power supply terminal, and one end of current limiting resistor R35 is connected to the analog acquisition terminal VCC_detection of MCU controller U5. The normally closed contact 3 of the relay KA1 is connected to the DC interface, and the common contact 4 of the relay KA1 is connected to the VBUS power supply input terminals of the two charging main chips U1 respectively.

4. The dual-channel fast charging device as described in claim 1, characterized in that: The indicator lights include one single-color power indicator and two dual-color charging indicator lights. Each battery charging compartment corresponds to one dual-color charging indicator light. Each dual-color charging indicator light consists of a red light and a green light. When charging, the red light is always on, and when fully charged, the green light is always on. When no battery is detected and there is a battery inside, the indicator light will flash alternately with the red light on for 8 seconds and the green light on for 1 second.

5. The dual-channel fast charging device as described in claim 1, characterized in that: The two main charging chips U1 are equipped with regulating resistors R19, R41 and R17, R40 respectively. The resistance values ​​of the regulating resistors R19 and R41 can switch between ternary lithium charging mode and lithium iron phosphate charging mode; the regulating resistors R17 and R40 can be set to a 2-5 battery series charging mode.

6. The dual-channel fast charging device as described in claim 1, characterized in that: The main charging chip U1 integrates an input voltage regulation loop, which automatically reduces the charging current to regulate voltage when the input voltage approaches the undervoltage threshold; it also integrates input overvoltage protection and NTC temperature adaptation functions, and works with NTC resistors R20 and R42 to achieve abnormal battery temperature protection.

7. The dual-channel fast charging device as described in claim 1 or 6, characterized in that: The MCU controller U5 communicates with the two charging main chips U1 via the I2C bus. The MCU controller U5 obtains the battery temperature by monitoring the voltage of the resistor RT1 to realize abnormal battery temperature protection, reads the battery fuel gauge data through the I2C bus to realize 48H charging timeout protection, and obtains the temperature of the charging main control chip U1 by monitoring the voltage of the resistor RT2 to realize over-temperature protection.

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