High-power vehicle-mounted charging device

Abstract

The utility model relates to a high-power vehicle-mounted charging device. Comprising a microcontroller, an EMC protection circuit, an input power supply anti-reverse connection protection circuit, a switch control circuit, an output voltage filter circuit, a current sampling network, a buck-boost control module circuit, a voltage negative feedback circuit, a current detection unit, a microprocessor protocol detection circuit and an output interface circuit protection circuit. The beneficial effects of the utility model are that the vehicle-mounted charging device capable of satisfying higher power is designed; an electronic element with higher power, high efficiency and low heat is selected to improve the charging efficiency, reduce heating and shorten the charging time; the designed device is reasonable in circuit and small in size, the internal installation space of the automobile is fully saved, and installation in the narrow internal space of the automobile is facilitated; the reasonably designed device circuit can also reduce loss and improve conversion efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of in-vehicle multimedia device charging, and particularly relates to a high-power in-vehicle charging device capable of operating efficiently in a narrow space. Background Art

[0002] Due to the continuous increase in the charging power of in-vehicle multimedia devices (such as smart phones), users' requirements for charging speed are also getting higher and higher. However, the existing in-vehicle multimedia device charging devices have the following disadvantages:

[0003] 1. Slow charging speed, unable to meet the fast charging requirements of advanced multimedia devices.

[0004] 2. Low conversion efficiency and serious heating.

[0005] 3. Large volume, which is not conducive to space utilization.

[0006] In summary, the existing in-vehicle multimedia devices cannot meet the fast charging requirements of current advanced multimedia devices; therefore, it is particularly important to design a high-power in-vehicle charging device capable of operating efficiently in a narrow space. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a high-power in-vehicle charging device.

[0008] This high-power in-vehicle charging device includes a microcontroller. The charging device is used to supply power to in-vehicle electrical devices or mobile phone multimedia devices; a corresponding power input connector is also provided; the input end of the power input connector is electrically connected to the vehicle power supply, and the output end of the power input connector is electrically connected to the in-vehicle charging device; the power input connector is used to connect the power from the vehicle and supply power to the in-vehicle charging device;

[0009] The in-vehicle charging device further includes: an EMC protection circuit, an input power reverse connection protection circuit, a switch control circuit, an output voltage filtering circuit, a current sampling network, a buck-boost control module circuit, a voltage negative feedback circuit, a current detection unit, a microprocessor protocol detection circuit, and an output interface circuit protection circuit;

[0010] The output end of the power input connector is electrically connected to the input end of the EMC protection circuit, and the output end of the EMC protection circuit is electrically connected to the input end of the input power reverse connection protection circuit; the output end of the input power reverse connection protection circuit is divided into three paths, one of which is electrically connected to the input end of the switch control circuit, another is electrically connected to the input end of the microprocessor protocol detection circuit, and the remaining one is electrically connected to the buck-boost control module circuit; the buck-boost control module circuit is electrically connected to the microcontroller, and the buck-boost control module circuit is also electrically connected to the switch control circuit; the switch control circuit is electrically connected to the output voltage filtering circuit, and the output voltage filtering circuit is electrically connected to the current sampling network; the output end of the current sampling network is divided into three paths, one of which is electrically connected to the voltage negative feedback circuit, the second is electrically connected to the current detection unit, and the third is electrically connected to the output interface circuit protection circuit; the voltage negative feedback circuit is electrically connected to the buck-boost control module circuit; the current detection unit is electrically connected to the buck-boost control module circuit;

[0011] The microprocessor is electrically connected to the switch control circuit, the buck-boost control module circuit, the output interface circuit, and in-vehicle electrical equipment or mobile phone multimedia equipment;

[0012] The microprocessor: is used to generate corresponding charging control instructions; is used to send charging control instructions to the switch control circuit, is used to communicate with the buck-boost control module circuit via I2C and send charging control instructions to the buck-boost control module circuit; is also used to perform handshake communication with the output interface circuit, in-vehicle electrical equipment or mobile phone multimedia equipment and send corresponding charging control instructions;

[0013] The EMC protection circuit is used to receive the power input from the power input connector, suppress interference of the input current and reduce external conducted radiation;

[0014] The input power reverse connection protection circuit is used to receive the current processed by the EMC protection circuit and prevent damage to the subsequent circuit caused by reverse connection of the voltage at the power input end;

[0015] The buck-boost control module circuit: is used to obtain power supply by receiving the current supplied by the output end of the input power reverse connection protection circuit; is used to receive the current processed by the switch control circuit; is used to receive the voltage sent by the voltage negative feedback circuit; is used to receive the current after overcurrent protection output by the current detection unit; is used to receive the charging control instructions sent by the microcontroller; is used to receive the charging protocol sent by the microprocessor protocol detection circuit; is used to comprehensively process the charging protocol, current and voltage, perform AD conversion, adjust the PWM duty cycle, perform step-up / step-down, and perform voltage stabilization to control the stability of the output voltage;

[0016] A switch control circuit is used to receive the current supplied by the output terminal of the input power supply reverse connection protection circuit to obtain power supply; it is used to receive the current processed by the buck-boost control module circuit; it is used to receive the control instructions sent by the microprocessor, and perform PWM control and voltage conversion on the output current of the buck-boost control module circuit according to different switching frequencies.

[0017] An output voltage filtering circuit is used to receive the current after the switch control circuit performs PWM control and voltage conversion on the output current of the buck-boost control module circuit, and suppress the voltage ripple of the current.

[0018] A current sampling network is used to sample the current output by the output voltage filtering circuit.

[0019] A voltage negative feedback circuit is used to receive the voltage sampled by the current sampling network.

[0020] A current detection unit is used to receive the current sampled by the current sampling network, detect the current, and perform overcurrent protection.

[0021] A microprocessor protocol detection circuit is used to receive the current supplied by the output terminal of the input power supply reverse connection protection circuit to obtain power supply, is used to receive the charging control instructions sent by the microprocessor, is used to supply power to the in-vehicle electrical equipment or match the corresponding charging protocol for the mobile phone multimedia equipment; it is used to receive the output of the buck-boost control module circuit.

[0022] An output interface circuit protection circuit is used to receive the current output by the current sampling network, protect the output interface, and supply power to the device to be charged, and the device to be charged includes in-vehicle electrical equipment or mobile phone multimedia equipment.

[0023] Preferably: The microprocessor protocol detection circuit uses a communication protocol chip, and the buck-boost control module circuit includes a DC-DC power conversion chip, a switch, and an inductor. The analog signal port, serial clock line, and data signal line of the communication protocol chip are electrically connected to the analog signal port, serial clock line, and data signal line of the DC-DC power conversion chip respectively.

[0024] Preferably: The input voltage of the buck-boost control module circuit is 9-24V DC voltage, and the output voltage of the buck-boost control module circuit is 5-20V DC voltage.

[0025] Preferably: The output interface circuit is a TYPE-C interface, and the DM, DP, CC1, and CC2 ports of the communication protocol chip are electrically connected to the DM, DP, CC1, and CC2 ports of the TYPE-C interface respectively.

[0026] The beneficial effects of the present utility model are:

[0027] In order to ensure the normal operation of high-power devices and meet higher heat dissipation requirements, the present utility model specifically designs a vehicle-mounted charging device that can meet higher power. The vehicle-mounted charging device selects higher-power, efficient, low-heat electronic components (EMC protection circuit, input power reverse connection protection circuit, buck-boost control module circuit, voltage negative feedback circuit, output voltage filtering circuit, microprocessor protocol detection circuit, output interface circuit, and current detection unit) to improve charging efficiency, reduce heat generation, and shorten the charging time. The designed device circuit is reasonable and small in size, fully saving the installation space inside the vehicle and facilitating installation in a narrow vehicle interior space. The reasonable device circuit can also reduce losses and improve power conversion efficiency.

[0028] The vehicle-mounted charging device of the present utility model supports the PD3.1 (20V / 5A) fast charging protocol, can meet the power output requirement of up to 100W, and also supports multiple fast charging protocols such as QC3.0 and BC1.2. It can provide efficient, stable, and fast charging services for multimedia devices, meet the charging needs of different devices, and significantly shorten the charging time. Brief Description of the Drawings

[0029] Figure 1 is the circuit module diagram of the present utility model;

[0030] Figure 2 is the circuit schematic diagram of the present utility model. Detailed Embodiments

[0031] The following further describes the present utility model in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

[0032] Embodiment 1

[0033] As Figure 1 shown, a high-power vehicle-mounted charging device includes a microcontroller. The charging device is used to supply power to vehicle-mounted electrical devices or mobile phone multimedia devices; a corresponding power input connector is also provided. The input end of the power input connector is electrically connected to the vehicle power supply, and the output end of the power input connector is electrically connected to the vehicle-mounted charging device. The power input connector is used to connect the power from the vehicle and supply power to the vehicle-mounted charging device. The vehicle-mounted charging device further includes: an EMC protection circuit, an input power reverse connection protection circuit, a switch control circuit, an output voltage filtering circuit, a current sampling network, a buck-boost control module circuit, a voltage negative feedback circuit, a current detection unit, a microprocessor protocol detection circuit, and an output interface circuit protection circuit;

[0034] The output terminal of the power input connector is electrically connected to the input terminal of the EMC protection circuit, and the output terminal of the EMC protection circuit is electrically connected to the input terminal of the input power reverse connection protection circuit; the output terminal of the input power reverse connection protection circuit is divided into three paths, one of which is electrically connected to the input terminal of the switch control circuit, another is electrically connected to the input terminal of the microprocessor protocol detection circuit, and the remaining one is electrically connected to the buck-boost control module circuit; the buck-boost control module circuit is electrically connected to the microcontroller, and the buck-boost control module circuit is also electrically connected to the switch control circuit; the switch control circuit is electrically connected to the output voltage filtering circuit, and the output voltage filtering circuit is electrically connected to the current sampling network; the output terminal of the current sampling network is divided into three paths, one of which is electrically connected to the voltage negative feedback circuit, the second is electrically connected to the current detection unit, and the third is electrically connected to the output interface circuit protection circuit; the voltage negative feedback circuit is electrically connected to the buck-boost control module circuit; the current detection unit is electrically connected to the buck-boost control module circuit;

[0035] The microprocessor is electrically connected to the switch control circuit, the buck-boost control module circuit, the output interface circuit, and the in-vehicle electrical equipment or mobile phone multimedia equipment;

[0036] Microprocessor: used to generate corresponding charging control instructions; used to send charging control instructions to the switch control circuit, used to communicate with the buck-boost control module circuit via I2C and send charging control instructions to the buck-boost control module circuit; also used to perform handshake communication with the output interface circuit, in-vehicle electrical equipment or mobile phone multimedia equipment and send corresponding charging control instructions;

[0037] The EMC protection circuit is used to receive the power input from the power input connector, suppress interference of the input current and reduce external conducted radiation;

[0038] The input power reverse connection protection circuit is used to receive the current processed by the EMC protection circuit and prevent damage to the subsequent circuits caused by the reverse connection of the voltage at the power input terminal;

[0039] The buck-boost control module circuit: used to be powered by receiving the current supplied by the output terminal of the input power reverse connection protection circuit; used to receive the current processed by the switch control circuit; used to receive the voltage sent by the voltage negative feedback circuit; used to receive the current after overcurrent protection output by the current detection unit; used to receive the charging control instructions sent by the microcontroller; used to receive the charging protocol sent by the microprocessor protocol detection circuit; used to comprehensively process the charging protocol, current and voltage, perform AD conversion, adjust the PWM duty cycle, perform boost / buck, and perform voltage stabilization to control the stability of the output voltage;

[0040] The switch control circuit is used to receive the current supplied by the output terminal of the input power supply reverse connection protection circuit to obtain power supply; it is used to receive the current processed by the buck-boost control module circuit; it is used to receive the control instructions sent by the microprocessor, and perform PWM control and voltage conversion on the output current of the buck-boost control module circuit according to different switching frequencies;

[0041] The output voltage filtering circuit is used to receive the current after the switch control circuit performs PWM control and voltage conversion on the output current of the buck-boost control module circuit, and suppresses the voltage ripple of the current;

[0042] The current sampling network is used to sample the current output by the output voltage filtering circuit;

[0043] The voltage negative feedback circuit is used to receive the voltage sampled by the current sampling network;

[0044] The current detection unit is used to receive the current sampled by the current sampling network, detect the current, and perform overcurrent protection;

[0045] The microprocessor protocol detection circuit is used to receive the current supplied by the output terminal of the input power supply reverse connection protection circuit to obtain power supply, is used to receive the charging control instructions sent by the microprocessor, is used to supply power to the in-vehicle electrical equipment or match the corresponding charging protocol for the mobile phone multimedia equipment; it is used to receive the output of the buck-boost control module circuit;

[0046] The output interface circuit protection circuit is used to receive the current output by the current sampling network, protect the output interface, and supply power to the device to be charged, and the device to be charged includes in-vehicle electrical equipment or mobile phone multimedia equipment.

[0047] The in-vehicle charging device of this embodiment supports the PD3.1 (20V / 5A) fast charging protocol, can meet the power output requirement of up to 100W, also supports multiple fast charging protocols such as QC3.0 and BC1.2, can provide efficient, stable and fast charging services for multimedia devices, meet the charging needs of different devices, and significantly shorten the charging time.

[0048] Embodiment 2

[0049] As Figure 2As shown in the figure, based on Embodiment 1, a high-power in-vehicle charging device: The microprocessor protocol detection circuit uses a communication protocol chip. The buck-boost control module circuit includes a DC-DC power conversion chip, a switch, and an inductor. The analog signal port, serial clock line, and data signal line of the communication protocol chip are respectively electrically connected to the analog signal port, serial clock line, and data signal line of the DC-DC power conversion chip. The input voltage of the buck-boost control module circuit is a 9-24V DC voltage, and the output voltage of the buck-boost control module circuit is a 5-20V DC voltage. The output interface circuit is a TYPE-C interface, and the DM, DP, CC1, and CC2 ports of the communication protocol chip are respectively electrically connected to the DM, DP, CC1, and CC2 ports of the TYPE-C interface.

[0050] The in-vehicle charging device of this embodiment supports the PD3.1 (20V / 5A) fast charging protocol, can meet the power output requirement of up to 100W, also supports multiple fast charging protocols such as QC3.0 and BC1.2, can provide efficient, stable, and fast charging services for multimedia devices, meet the charging needs of different devices, and significantly shorten the charging time.

Claims

1. A high-power vehicle-mounted charging device, comprising a microcontroller, the charging device is used to supply power to vehicle-mounted electrical equipment or mobile multimedia equipment; and is also provided with a corresponding power input connector; The input end of the power input connector is electrically connected to the car power supply, and the output end of the power input connector is electrically connected to the vehicle charging device; The power input connector is used to connect the power from the car to supply power to the on-board charging device; its characteristics are: The on-board charging device also includes: an EMC protection circuit, an input power reverse connection protection circuit, a switch control circuit, an output voltage filter circuit, a current sampling network, a buck-boost control module circuit, a voltage negative feedback circuit, a current detection unit, a microprocessor protocol detection circuit and an output interface circuit protection circuit; The output end of the power input connector is electrically connected to the input end of the EMC protection circuit, and the output end of the EMC protection circuit is electrically connected to the input end of the input power reverse connection protection circuit; the output end of the input power reverse connection protection circuit is divided into three paths, one of which is electrically connected to the input end of the switch control circuit, another is electrically connected to the input end of the microprocessor protocol detection circuit, and the remaining one is electrically connected to the buck-boost control module circuit; the buck-boost control module circuit is electrically connected to the microcontroller, and the buck-boost control module circuit is also electrically connected to the switch control circuit; the switch control circuit is electrically connected to the output voltage filter circuit, and the output voltage filter circuit is electrically connected to the current sampling network; the output end of the current sampling network is divided into three paths, one of which is electrically connected to the voltage negative feedback circuit, the second is electrically connected to the current detection unit, and the third is electrically connected to the output interface circuit protection circuit; the voltage negative feedback circuit is electrically connected to the buck-boost control module circuit; the current detection unit is electrically connected to the buck-boost control module circuit; The microprocessor is electrically connected to the switch control circuit, the buck-boost control module circuit, the output interface circuit, and the vehicle-mounted electrical equipment or the mobile phone multimedia equipment; Microprocessor: used to generate corresponding charging control instructions; used to send charging control instructions to the switch control circuit, used to communicate with the buck-boost control module circuit through I2C, and send charging control instructions to the buck-boost control module circuit; also used to handshake with the output interface circuit, vehicle-mounted electrical equipment or mobile multimedia equipment, and send corresponding charging control instructions; The EMC protection circuit is used to receive the power input from the power input connector, suppress the interference of the input current and reduce the external conducted radiation; The input power reverse connection protection circuit is used to receive the current processed by the EMC protection circuit to prevent the reverse connection of the voltage at the power input end from damaging the subsequent circuit; Buck-boost control module circuit: used to receive the current supplied by the output end of the input power reverse connection protection circuit to obtain power supply; used to receive the current processed by the switch control circuit; used to receive the voltage sent by the voltage negative feedback circuit; used to receive the current after overcurrent protection output by the current detection unit; used to receive the charging control instruction sent by the microcontroller; used to receive the charging protocol sent by the microprocessor protocol detection circuit; used to integrate the charging protocol, current and voltage, perform AD conversion, adjust the PWM duty cycle, perform boost / buck, and perform voltage stabilization; The switch control circuit is used to receive the current supplied by the output end of the input power reverse connection protection circuit to obtain power supply; to receive the current processed by the buck-boost control module circuit; to receive the control instruction sent by the microprocessor, and to perform PWM control and voltage conversion on the output current of the buck-boost control module circuit according to the different switching frequencies; An output voltage filter circuit is used to receive the current after the output current of the buck-boost control module circuit is PWM-controlled and voltage-converted by the switch control circuit, and to suppress the ripple of the voltage of the current; A current sampling network is used to sample the current output by the output voltage filter circuit; A voltage negative feedback circuit is used to receive the voltage sampled by the current sampling network; A current detection unit, used to receive the current sampled by the current sampling network, detect the current, and perform overcurrent protection; A microprocessor protocol detection circuit is used to receive the current supplied by the output end of the input power reverse connection protection circuit to obtain power supply, and is used to receive the charging control instruction sent by the microprocessor to supply power to the vehicle-mounted electrical equipment or match the corresponding charging protocol for the mobile multimedia equipment; and is used to receive the output of the buck-boost control module circuit; The output interface circuit protection circuit is used to receive the current output by the current sampling network, protect the output interface, and supply power to the charged device, which includes the power supply for vehicle-mounted electrical equipment or mobile phone multimedia equipment.

2. The high-power vehicle-mounted charging device according to claim 1, characterized in that: The microprocessor protocol detection circuit adopts a communication protocol chip, and the buck-boost control module circuit includes a DC-DC power conversion chip, a switch and an inductor. The analog signal port, serial clock line and data signal line of the communication protocol chip are electrically connected to the analog signal port, serial clock line and data signal line of the DC-DC power conversion chip.

3. The high-power vehicle-mounted charging device according to claim 2 is characterized in that: The input voltage of the buck-boost control module circuit is 9-24V DC voltage, and the output voltage of the buck-boost control module circuit is 5-20V DC voltage.

4. The high-power vehicle-mounted charging device according to claim 2, characterized in that: The output interface circuit is a TYPE-C interface, and the DM, DP, CC1, and CC2 ports of the communication protocol chip are electrically connected to the DM, DP, CC1, and CC2 ports of the TYPE-C interface respectively.

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