Cascade type electronic load device based on CAN bus

Abstract

The utility model provides a cascade type electronic load device based on a CAN bus, which comprises a constant current load box formed in a cabinet mode, a plurality of drawers are arranged in the constant current load box, each layer of drawer is designed to be a standard load unit, a main control board and a serial port screen are arranged in the topmost layer of drawer of the constant current load box, and the serial port screen is arranged in the topmost layer of drawer of the constant current load box. Slave control boards, driving boards, load boards and detection circuits are arranged in the other drawers, the main control board sends control instructions to the slave control boards, and the slave control boards drive the load boards to work through the driving boards according to the obtained instructions; the detection circuit comprises a current detection circuit and a voltage detection circuit which are respectively used for detecting current and voltage numerical values, a voltage signal is fed back to the main control board, a current signal is fed back to the slave control board, the on-state of an MOS (Metal Oxide Semiconductor) tube on the load board is controlled, constant current is realized, and the current detection circuit and the voltage detection circuit are respectively connected with a power supply to be detected. The device is used for dynamic characteristic testing of a storage battery type power supply, and the controllability of constant-current discharge of the storage battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic loads, and in particular relates to a cascade electronic load device based on a CAN bus. Background Art

[0002] A general electronic load is a device that consumes electrical energy by controlling the conduction amount (i.e., duty cycle) of an internal power tube or transistor and relying on the dissipated power of the power tube. It accurately detects the load voltage through an embedded intelligent controller, thereby precisely adjusting the load current. It can also simulate load short circuits and simulate load types such as inductive, resistive, and capacitive. It is mainly used in product optimization design and product performance improvement.

[0003] As an energy supply device, batteries are mainly used in situations such as starting motors and continuously supplying energy to battery vehicles. The performance of batteries directly determines the stability and reliability of electric products. Battery testing involves multiple working modes such as constant current, constant voltage, and pulse. Therefore, intelligent, stable and reliable electronic loads are essential tools for testing battery performance.

[0004] Existing electronic load devices have the problems of low intelligence, inconvenient maintenance and replacement, and low scalability. Summary of the invention

[0005] In view of this, the utility model aims to overcome the shortcomings of the above-mentioned problems in the prior art and proposes a cascaded electronic load device based on the CAN bus for dynamic characteristic testing of battery power sources to improve the controllability of constant current discharge of the battery.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A cascade electronic load device based on CAN bus, comprising a constant current load box formed in a cabinet mode, wherein a plurality of drawers are arranged in the constant current load box, wherein each layer of drawers is designed as a standard load unit, wherein a main control board and a serial port screen are arranged in the top drawer of the constant current load box, and slave control boards, drive boards, load boards, and detection circuits are arranged in other drawers, wherein the main control board sends control instructions to each slave control board, and the slave control board drives the load board to work via the drive board according to the obtained instructions; wherein the detection circuit comprises a current detection circuit and a voltage detection circuit, which respectively detect current and voltage values, wherein the voltage signal is fed back to the main control board, and the current signal is fed back to the slave control board, so as to control the on-state of the MOS tube on the load board and realize constant current, and wherein the current detection circuit and the voltage detection circuit are respectively connected to a power supply to be tested.

[0008] Furthermore, the main control board and the slave orifice board are connected via a CAN bus.

[0009] Furthermore, a bottom plate is provided at the bottom of the drawer, a slave control board slot and a load board slot are provided on the base, a compartment is provided on the side of the base, a positive bus bar and a negative bus bar are arranged in the compartment, and are connected to corresponding electrodes of the power supply under test through cables, and a working indicator light is provided on the front panel of the drawer.

[0010] Furthermore, the serial port screen is connected to the main control board via a communication bus.

[0011] Furthermore, the detection circuit is connected to the main control board and the slave control board through an A / D converter.

[0012] Furthermore, the main control board adopts an ARM single-chip microcomputer.

[0013] Compared with the prior art, the cascaded electronic load device based on the CAN bus described in the utility model has the following advantages:

[0014] (1) The load plates of the utility model have the same specifications and sizes and can be interchanged, which is convenient for on-site maintenance and replacement.

[0015] (2) The load unit of the utility model is designed as a standard drawer structure, which is convenient for cascading and load expansion and easy for maintenance.

[0016] (3) The master-slave controller structure of the utility model is connected via the CAN bus, and the electrical signal can achieve isolation of the power unit and the control unit, and has strong anti-interference performance.

[0017] (4) The utility model realizes human-computer information interaction through a display screen, has a high degree of intelligence, and is easy to upgrade and expand. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0019] Figure 1 This is a structural schematic diagram of a cascaded electronic load device based on a CAN bus of the utility model;

[0020] Figure 2 It is a schematic diagram of the principle of the utility model;

[0021] Figure 3 It is a schematic diagram of the physical layout of the boards in the drawer of the standard load unit of the utility model;

[0022] Figure 4 This is a schematic diagram of the standard load unit drawer structure of the utility model.

[0023] Description of Reference Numerals

[0024] 1- bottom plate; 2- load plate; 3- working indicator light; 4- compartment; 5- constant current load box; 6- drawer. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] like Figure 1As shown, the utility model provides a cascade electronic load device based on CAN bus, including a constant current load box 5 composed of a cabinet mode, a plurality of drawers 6 are arranged in the constant current load box 5, each layer of drawers 6 is designed as a standard load unit, a main control board and a serial port screen are arranged in the top drawer of the constant current load box 5, and slave control boards, drive boards, load boards 2, and detection circuits are arranged in other drawers, the main control board sends control instructions to each slave control board, and the slave control board drives the load board to work through the drive board according to the obtained instructions; the detection circuit includes a current detection circuit and a voltage detection circuit, which respectively detect the current and voltage values, and the voltage signal is fed back to the main control board, and the current signal is fed back to the slave control board to control the MOS tube on the load board to be connected to achieve constant current, and the current detection circuit and the voltage detection circuit are respectively connected to the power supply to be tested.

[0030] In terms of physical structure, the utility model forms a constant current load box in a cabinet mode to realize the convenience of system cascading. Figure 2 shown.

[0031] In the utility model, the main control board serves as the core, which can receive the working setting parameters input by the serial port screen, thereby transmitting the control information to the lower slave control board; and also send the collected voltage, current and other data to the serial port screen to realize the display of equipment operation information.

[0032] The slave control board connected based on the CAN bus mainly receives the number of channels sent by the main control board through the CAN bus, calculates the magnitude of the control MOS tube, and thus connects the corresponding load to the loop; in addition, the slave control board detects the loop current status in real time and feeds back to the main control board.

[0033] Combined with the scalable characteristics of the CAN bus, multiple slave control boards can be incorporated into the system branches to realize the cascading of multiple load boxes and achieve higher load carrying capacity.

[0034] The circuit board layout in the standard drawer of the standard load unit is as follows Figure 3 As shown. Load boards with the same specifications are physically and electrically connected to the base plate through European slots on the base plate. In the middle is the slot for the load unit control board (slave control board), which is connected to the main board through the CAN bus and transmits control signals to the load board through the base plate socket. Positive and negative bus bars are arranged on both sides of the base plate and connected to the corresponding electrodes of the power supply under test through cables. The load boards have the same specifications, which greatly reduces the manufacturing cost of the equipment and facilitates on-site maintenance and testing. The load boards can be replaced at will, which is convenient for quick maintenance and replacement.

[0035] Figure 4It is a standard load unit drawer structure layout, in which the bottom plate is directly fixed on the internal frame of the drawer, the load board 2 is evenly inserted into the bottom plate socket, and the drawer panel has the standard unit working indicator light 3; in the side compartment of the drawer, there is a signal cable connecting the drawer on this layer with the system to facilitate the push-pull installation and maintenance inspection of the drawer.

[0036] Specifically, the serial port screen is connected to the main control board via a communication bus.

[0037] Specifically, the detection circuit is connected to the main control board and the slave control board through an A / D converter.

[0038] Specifically, the main control board adopts an ARM single-chip microcomputer.

[0039] The working process of the utility model is as follows:

[0040] The serial port screen uses the communication bus serial port bus to interact with the main control board and set various basic working data of the electronic load. The main board sends control instructions to each slave control board via the CAN bus. The slave control board drives the load board to work according to the instructions obtained through the driver board. By inputting a constant current output value to the electronic load, the voltage of the power supply to be tested (referring to the battery to be tested) will gradually decrease under the load state. At this time, the detection circuit detects the current and voltage values ​​respectively, and feeds back to the slave control board and the main control board. The ARM microcontroller controls the on and off of the MOSFET based on the Ohm's law mechanism to change the resistance value of the resistive load board, so that the load value of the electronic load output port changes with the change of the battery voltage, and finally realizes the electronic load with constant current output.

[0041] The electronic load device of the utility model is connected to the power supply to be tested by only two power cables, the positive and negative poles. The electronic load can automatically match the load parameters according to the working characteristics of the battery, so as to achieve automatic cascading from micro-power loads (0.5A-40A) to high-power loads (100A-1000A), thereby broadening the application scope and adaptation scenarios of the electronic load, serving the industrial, information and aviation automation application fields, and having good scalability.

[0042] It should be noted that the various unit components, current detection circuits, voltage detection circuits, etc. used in the present invention are all existing products, and the algorithms used in the main control board, slave control board, etc. are also conventional technologies in the field.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cascaded electronic load device based on a CAN bus, characterized in that: The invention comprises a constant current load box (5) formed in a cabinet mode, wherein a plurality of drawers (6) are arranged in the constant current load box (5), wherein each layer of drawers (6) is designed as a standard load unit, wherein a main control board and a serial port screen are arranged in the top drawer of the constant current load box (5), and slave control boards, a driving board, a load board (2), and a detection circuit are arranged in the other drawers, wherein the main control board sends a control instruction to each slave control board, and the slave control board drives the load board to work via the driving board according to the obtained instruction; the detection circuit comprises a current detection circuit and a voltage detection circuit, which respectively detect the current and voltage values, wherein the voltage signal is fed back to the main control board, and the current signal is fed back to the slave control board, and the MOS tube on the load board is controlled to be connected to realize constant current, and the current detection circuit and the voltage detection circuit are respectively connected to a power supply to be tested.

2. The cascaded electronic load device based on the CAN bus according to claim 1, characterized in that: The main control board and the slave orifice board are connected via a CAN bus.

3. The cascaded electronic load device based on the CAN bus according to claim 1, characterized in that: The bottom of the drawer (6) is provided with a bottom plate, the base is provided with a slave control board slot and a load board slot, the side of the base is provided with a compartment (4), a positive bus bar and a negative bus bar are arranged in the compartment (4), and are connected to corresponding electrodes of the power supply under test through cables, and a working indicator light (3) is provided on the front panel of the drawer (6).

4. The cascaded electronic load device based on the CAN bus according to claim 1, characterized in that: The serial port screen is connected to the main control board via a communication bus.

5. The cascaded electronic load device based on the CAN bus according to claim 1, characterized in that: The detection circuit is connected to the main control board and the slave control board through an A / D converter.

6. The cascaded electronic load device based on CAN bus according to claim 1, characterized in that: The main control board adopts an ARM single chip microcomputer.

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