CN217789559U

CN217789559U - DC-DC converter, power supply system for fuel cell, and vehicle-mounted device

Info

Publication number: CN217789559U
Application number: CN202221851839.2U
Authority: CN
Inventors: 卢勇; 查胜亮; 邹志根
Original assignee: Guangdong Qingneng New Energy Technology Co ltd
Current assignee: Guangdong Qingneng New Energy Technology Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-11-11
Anticipated expiration: 2032-07-18

Abstract

The utility model provides a DC-DC converter, fuel cell's electrical power generating system and mobile unit, wherein, DC-DC converter includes step-up and step-down circuit and low voltage distribution device, step-up and step-down circuit and low voltage distribution device all locate on the PCB board, still be equipped with the socket on the PCB board, the input of step-up and step-down circuit is connected with first voltage input end and second voltage input end respectively to carry out the step-up and step-down to input voltage and handle; the input end of the low-voltage distribution device is connected with the second voltage input end, and the output end of the low-voltage distribution device is connected with the socket. The utility model discloses it is inside integrated to DC-DC converter with low voltage distribution device for whole DC-DC converter's waterproof grade improves, saves a low voltage distribution device's externally mounted position based on this. Furthermore, by adding intelligent judgment, the state of each path of fuse is reported through the CAN communication bus, and the troubleshooting time of the fault circuit is effectively saved.

Description

DC-DC converter, power supply system for fuel cell, and vehicle-mounted device

Technical Field

The utility model relates to a fuel cell field, in particular to DC-DC converter, fuel cell's electrical power generating system and mobile unit.

Background

Most of the existing power supply systems for fuel cells require a low-voltage power distribution device to be mounted on the system for short-circuit protection of each sub-component. The design of low pressure distribution device independent assembly not only occupies system space for the volume increase leads to the waterproof grade of electrical power generating system can't reach the IP67 grade moreover, often will customize the new mould of development among the prior art and ensure the waterproof protection between low pressure distribution device and other structures, and the cost of manufacture improves greatly. In addition, the original low-voltage distribution device only has the on-off function when encountering circuit faults, and needs to be checked one by one when actually checking the problems, so that the efficiency is low.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to occupy the system space in order to overcome prior art low pressure distribution device is external alone, and fuel cell's electrical power generating system waterproof grade is lower, and the defect of difficulty of troubleshooting when circuit trouble appears, provides a DC-DC converter, fuel cell's electrical power generating system and mobile unit.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

in a first aspect, a DC-DC converter is provided, which includes a buck-boost circuit and a low-voltage power distribution device, both disposed on a PCB board, and a socket disposed on the PCB board,

the input end of the voltage boosting and reducing circuit is respectively connected with the first voltage input end and the second voltage input end, and the input voltage is boosted and reduced;

the input end of the low-voltage distribution device is connected with the second voltage input end, and the output end of the low-voltage distribution device is connected with the socket.

Preferably, the low voltage power distribution device comprises at least one fuse;

one end of the fuse is connected with the second voltage input end, and the other end of the fuse is connected with the pin of the socket.

Preferably, said low voltage distribution device comprises at least one step-down circuit;

the voltage reduction circuit is used for reducing the voltage of input voltage, the input end of the voltage reduction circuit is connected with the second voltage input end, and the output end of the voltage reduction circuit is connected with pins of the socket.

Preferably, the at least one voltage-reducing circuit includes a first voltage-reducing circuit and a second voltage-reducing circuit, the first voltage-reducing circuit is configured to reduce the input voltage to obtain a first voltage, and the second voltage-reducing circuit is configured to reduce the input voltage to obtain a second voltage.

Preferably, the buck-boost circuit, the first buck circuit and/or the second buck circuit comprise a fuse.

Preferably, the buck-boost circuit and/or the low voltage power distribution device comprise a CAN communication interface.

In a second aspect, a power supply system for a fuel cell is provided, which includes the above DC-DC converter.

In a third aspect, there is provided an in-vehicle apparatus including the power supply system of the fuel cell described above.

Preferably, the on-board unit further comprises at least one sensor connected to the low voltage power distribution device via the socket.

Preferably, the at least one sensor comprises a vehicle speed sensor and/or a vehicle light sensor.

The utility model discloses an actively advance the effect and lie in: the integration of the low-voltage power distribution device into the interior of the DC-DC converter leads to an increase in the level of water protection of the entire DC-DC converter, on the basis of which an external installation location for the low-voltage power distribution device is dispensed with. Furthermore, by adding intelligent judgment and reporting the state of each fuse through a CAN communication bus, the troubleshooting time of a fault circuit is effectively saved.

Drawings

Fig. 1 is a schematic circuit diagram of a DC-DC converter according to an embodiment of the present invention.

Detailed Description

The present invention will be more clearly and completely described below with reference to the accompanying drawings.

Example 1

The present embodiment provides a DC-DC converter, as shown in fig. 1, which includes a buck-boost circuit 11 and a low-voltage power distribution device 12, where the buck-boost circuit 11 and the low-voltage power distribution device 12 are both disposed on a PCB board, and the PCB board is further provided with a socket 5; the input end of the boost-buck circuit 11 is respectively connected with the first voltage input end 2 and the second voltage input end 3, and performs boost-buck processing on the input voltage; the input of the low-voltage distribution device 12 is connected to the second voltage input 3 and the output is connected to the socket 5.

The socket 5 may include a plurality of PINs 4, and may also be referred to as a multi-PIN socket.

In an alternative embodiment, the low voltage power distribution device 12 includes at least one fuse 13; one end of the fuse 13 is connected to the second voltage input terminal 3, and the other end is connected to the pin 4 of the socket 5.

In an alternative embodiment, the low voltage power distribution device 12 includes at least one voltage step-down circuit; the voltage reduction circuit is used for reducing the voltage of input voltage, the input end of the voltage reduction circuit is connected with the second voltage input end 3, and the output end of the voltage reduction circuit is connected with a pin 4 of the socket 5.

In an optional embodiment, the at least one voltage-reducing circuit includes a first voltage-reducing circuit 14 and a second voltage-reducing circuit 15, the first voltage-reducing circuit 14 is configured to reduce the input voltage to obtain a first voltage, and the second voltage-reducing circuit 15 is configured to reduce the input voltage to obtain a second voltage.

In a specific example, the second voltage input terminal 3 is used as a low voltage power supply to provide a voltage of 24V to the buck-boost circuit 11 and the low voltage distribution device 12, the first buck circuit 14 is used to perform a buck process on the voltage of 24V to obtain a voltage of 5V, and the second buck circuit 15 is used to perform a buck process on the voltage of 24V to obtain a voltage of 12V. Further, in the above example, if two pins capable of providing 24V voltage are needed at this time, a first fuse and a second fuse are needed, and the first fuse and the second fuse transmit 24V voltage; if two pins capable of providing 5V voltage are needed at this time, two first voltage reduction circuits are needed.

The buck-boost circuit 11, the first buck circuit 14, and the second buck circuit 15 may also include fuses. In a specific implementation, the buck-boost circuit 11 and the low-voltage power distribution device 12 may further include a CAN communication interface 16, and the CAN communication interface 16 is plugged into a CAN communication bus for transmitting the communication status information of each fuse.

In a specific example, the socket 5 is installed at a side of the DC-DC converter 1 for connecting an external harness plug, the external harness plug may be connected to an external load, the external load may be various sensors, the fuse may be a self-recovery fuse, if the external load has a short circuit, the fuse connected to the external load may be automatically disconnected, and the disconnected fuse may be automatically recovered after the short circuit is removed. For example, the vehicle speed sensor may be connected to a voltage step-down circuit connected to output 5V through a socket; the lamp sensor is connected to a voltage step-down circuit outputting 12V through a socket. When the vehicle speed sensor has a circuit short circuit problem, a fuse connected with the vehicle speed sensor and used for outputting 5V voltage reduction circuits is disconnected, fault information of the fuse is transmitted to the vehicle-mounted terminal through the CAN communication bus, and intelligent error reporting is achieved.

Further, the structural design with high integration level can make the waterproof level of the whole DC-DC converter 1 reach IP67 level.

In a specific implementation, the control chips in the first voltage-reducing circuit and the second voltage-reducing circuit may be PWM (pulse width modulation) control chips, for example, the first voltage-reducing circuit 14 and the second voltage-reducing circuit 15 are integrated on a circuit board by using a high-efficiency PWM control chip, which has the advantages of high efficiency and small size.

The embodiment integrates the low-voltage power distribution device into the DC-DC converter, so that the waterproof grade of the whole DC-DC converter is improved, and an external installation position of the low-voltage power distribution device is omitted. Furthermore, by adding intelligent judgment, the state of each path of fuse is reported through the CAN communication bus, and the troubleshooting time of the fault circuit is effectively saved.

Example 2

The present embodiment provides a power supply system for a fuel cell including the DC-DC converter as in embodiment 1.

DC-DC converters are essential for fuel cell power systems, and low voltage power distribution devices of 5V, 12V and 24V are the most common power distribution modes of fuel cell power systems today. The power supply system of the fuel cell may be applied to an in-vehicle device.

The embodiment integrates the low-voltage power distribution device into the DC-DC converter, so that the waterproof grade of the whole DC-DC converter is improved, and the installation position of the low-voltage power distribution device is saved for the power supply system of the fuel cell. Furthermore, by adding intelligent judgment, the state of each path of fuse is reported through the CAN communication bus, and the troubleshooting time of the fault circuit is effectively saved.

Example 3

The present embodiment provides an in-vehicle apparatus including a power supply system of a fuel cell as in embodiment 2. The on-board unit further comprises at least one sensor connected to the low voltage power distribution device via the socket.

In one specific example, the sensors include a vehicle speed sensor and a vehicle light sensor, each connected to the low voltage power distribution device in the DC-DC sensor through one pin of the socket. For example, the vehicle speed sensor may be connected to a voltage step-down circuit outputting 5V through a first pin of the socket; the lamp sensor may be connected to the step-down circuit outputting 12V through a second pin of the socket. When the vehicle speed sensor has a circuit short circuit problem, a fuse connected with the vehicle speed sensor and used for outputting 5V voltage reduction circuits is disconnected, fault information of the fuse is transmitted to the vehicle-mounted terminal through the CAN communication bus, and intelligent monitoring is achieved.

The embodiment integrates the low-voltage power distribution device into the DC-DC converter, so that the waterproof grade of the whole DC-DC converter is improved, and the installation position of the low-voltage power distribution device is saved for the power supply system of the fuel cell based on the waterproof grade, so that the space of the vehicle-mounted equipment is saved more. Furthermore, by adding intelligent judgment and reporting the state of each fuse through a CAN communication bus, the troubleshooting time of a fault circuit is effectively saved.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A DC-DC converter is characterized by comprising a buck-boost circuit and a low-voltage distribution device, wherein the buck-boost circuit and the low-voltage distribution device are both arranged on a PCB (printed circuit board), and a socket is also arranged on the PCB;

the input end of the voltage boosting and reducing circuit is respectively connected with the first voltage input end and the second voltage input end, and the input voltage is subjected to voltage boosting and reducing processing;

2. A DC-DC converter according to claim 1, wherein the low voltage power distribution device comprises at least one fuse;

3. A DC-DC converter according to claim 1 or 2, wherein the low voltage distribution means comprises at least one buck circuit;

4. The DC-DC converter of claim 3, wherein the at least one voltage-dropping circuit comprises a first voltage-dropping circuit for dropping the input voltage to obtain a first voltage and a second voltage-dropping circuit for dropping the input voltage to obtain a second voltage.

5. The DC-DC converter of claim 4, wherein the buck-boost circuit, the first buck circuit, and/or the second buck circuit comprises a fuse.

6. A DC-DC converter according to claim 5, characterized in that the buck-boost circuit and/or the low voltage distribution device comprises a CAN communication interface.

7. A power supply system for a fuel cell, comprising the DC-DC converter according to any one of claims 1 to 6.

8. An in-vehicle apparatus comprising a power supply system of the fuel cell according to claim 7.

9. The in-vehicle device of claim 8, further comprising at least one sensor coupled to the low voltage power distribution apparatus via the receptacle.

10. The in-vehicle apparatus according to claim 9, wherein the at least one sensor includes a vehicle speed sensor and/or a vehicle lamp sensor.