Heavy-load AGV high-voltage power supply system starting charge and discharge control circuit and method

Abstract

The invention discloses a heavy-load AGV high-voltage power supply system starting charge and discharge control circuit and method.The heavy-load AGV high-voltage power supply system starting charge and discharge control circuit comprises a low-voltage battery, a control switch, a low-voltage control system, a high-voltage system and a DC converter, the low-voltage battery is used for providing control voltage, and the input end of the control switch is connected with the positive electrode of the low-voltage battery; the low-voltage control system is connected with the negative electrode of the low-voltage battery and the output end of the control switch and used for supplying energy to low-voltage equipment and sending or receiving control information, and the high-voltage system control starting end is in signal connection with the low-voltage control system and used for receiving control information of the low-voltage control system. And the DC converter is arranged between the low-voltage battery and the high-voltage system and is used for charging the low-voltage battery and supplying power to the low-voltage control system. According to the invention, the AGV high-voltage power supply and the AGV low-voltage power supply can be separately controlled to supply power, the AGV parking maintenance time and cost are reduced, and the working stability and the service life are ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage power supply, and in particular relates to a startup charge and discharge control circuit and method for a heavy-load AGV high-voltage power supply system. Background Art

[0002] During continuous operation, heavy-load AGVs need to have strong power supply endurance and fast high-current charging and discharging capabilities;

[0003] In the existing technology, AGVs generally use a low-voltage power supply system with a voltage level of 24 / 48v. This type of system has the characteristics of low cost and simple maintenance. However, the disadvantage of the low-voltage power supply system is that the AGV will frequently discharge large currents under conditions such as heavy loading, starting, and acceleration. The power supply system will have problems such as overheating, short circuit, battery leakage, and capacity reduction, which pose a safety hazard. At the same time, there is a significant decrease in battery life. The current treatment method is to increase the battery capacity and select batteries with larger charge and discharge currents. This method will cause the power supply system of the AGV to have problems such as overheating, short circuit, battery leakage, and capacity reduction under conditions such as heavy loading, starting, and acceleration, which poses a safety hazard. Summary of the Invention

[0004] In order to at least partially solve the technical problems existing in the above-mentioned prior art, the present invention provides a startup charge and discharge control circuit and method for a heavy-duty AGV high-voltage power supply system.

[0005] The heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit of the present invention includes a low-voltage battery, a control switch, a low-voltage control system, a high-voltage system and a DC converter, wherein the low-voltage battery is used to provide a control voltage, and the control switch input end is connected to the positive electrode of the low-voltage battery for controlling the discharge of the low-voltage battery, and the low-voltage control system is connected to the negative electrode of the low-voltage battery and the output end of the control switch for supplying energy to the low-voltage equipment and sending or receiving control information, and the high-voltage system control startup end is connected to the low-voltage control system signal for receiving the low-voltage control system control information and providing directional power to the high-voltage equipment, and the DC converter is arranged between the low-voltage battery and the high-voltage system for charging the low-voltage battery and powering the low-voltage control system, wherein:

[0006] The low-voltage control system includes a holding circuit module, a low-voltage starting relay, a low-voltage power supply contactor and a logic control module. The holding circuit module is used to control the power on and off. The input end of the low-voltage starting relay is connected to the output end of the holding circuit module to provide a starting control signal. The input end of the low-voltage power supply contactor is connected to the output end of the low-voltage starting relay to control the power supply to the AGV low-voltage load. The input end of the logic control module is connected to the output end of the low-voltage power supply contactor to control the discharge of the high-voltage system.

[0007] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, the input end of the holding circuit module is connected to the negative electrode of the low-voltage battery and the output end of the control switch.

[0008] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, the high-voltage system includes a high-voltage battery management system and a high-voltage battery, the high-voltage battery management system control end is communicatively connected to the logic control module, the high-voltage battery output end is connected to the high-voltage battery management system input end, and the high-voltage battery management system output end is connected to the high-voltage equipment.

[0009] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, the DC converter input end is connected to the high-voltage battery management system output end, and the DC converter output end is connected to the low-voltage battery.

[0010] The startup charge and discharge control method of the heavy-duty AGV high-voltage power supply system of the present invention includes:

[0011] Start control: Turn the control switch to the closed position, the low-voltage start relay is energized and closed, its normally open contacts are closed, and the low-voltage power supply contactor is controlled to close. The low-voltage battery supplies power to the low-voltage equipment of the vehicle, and the high-voltage system is controlled to discharge through the logic control module. At the same time, the DC converter outputs 24V voltage to power the low-voltage equipment of the vehicle and charge the low-voltage battery;

[0012] Shutdown control: Turn the control switch to the off position. The logic control module detects the off state of the control switch and controls the high-voltage system to stop discharging, the DC converter to stop working, the low-voltage starting relay to lose power and disconnect, and controls the low-voltage power supply contactor to disconnect;

[0013] Charging control: When charging a heavy-loaded AGV, the logic control module detects the charging gun and controls the high-voltage system to charge, and charges the low-voltage battery through the DC converter. When the logic control module abnormally pulls the gun or the system is abnormal, the logic control module controls the high-voltage system to stop charging.

[0014] The heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit and method of the present invention have the following advantages and beneficial effects:

[0015] The present invention utilizes a low-voltage control system to control the high-voltage system to separately control the power supply of the AGV high and low voltage power supplies, effectively meeting the frequent high-power output of the AGV, effectively reducing the time and cost required for AGV parking maintenance, and ensuring the stability of work and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only used to further understand the embodiments of the present invention and constitute part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0017] Figure 1 This is a structural diagram of the charging and discharging control circuit for starting the heavy-duty AGV high-voltage power supply system of the present invention;

[0018] Figure 2 This is a flow chart of the charge and discharge control startup of the heavy-duty AGV high-voltage power supply system of the present invention.

[0019] Description of reference numerals:

[0020] 1: low voltage battery; 2: control switch;

[0021] 3: low voltage control system, 31: holding circuit module, 32: low voltage starting relay, 33: low voltage power supply contactor, 34: logic control module;

[0022] 4: High-voltage system, 41: High-voltage battery management system, 42: High-voltage battery;

[0023] 5: DC converter. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figure 1As shown, the heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit of the present invention includes a low-voltage battery 1, a control switch 2, a low-voltage control system 3, a high-voltage system 4 and a DC converter 5. The low-voltage battery 1 is used to provide a control voltage. The input end of the control switch 2 is connected to the positive electrode of the low-voltage battery 1 for controlling the discharge of the low-voltage battery 1. The low-voltage control system 3 is connected to the negative electrode of the low-voltage battery 1 and the output end of the control switch 2 for supplying energy to the low-voltage equipment and sending or receiving control information. The high-voltage system 4 controls the startup end to be connected to the low-voltage control system 3 signal for receiving the control information of the low-voltage control system 3 and providing directional power to the high-voltage equipment. The DC converter 5 is arranged between the low-voltage battery 1 and the high-voltage system 4 for charging the low-voltage battery 1 and powering the low-voltage control system 3, wherein:

[0026] The low-voltage control system 3 includes a holding circuit module 31, a low-voltage starting relay 32, a low-voltage power supply contactor 33 and a logic control module 34. The holding circuit module 31 is used to control the power on and off. The input end of the low-voltage starting relay 32 is connected to the output end of the holding circuit module 31 to provide a starting control signal. The input end of the low-voltage power supply contactor 33 is connected to the output end of the low-voltage starting relay 32 to control the power supply to the AGV low-voltage load, such as controllers, sensors, human-computer interaction and other low-voltage equipment. The input end of the logic control module 34 is connected to the output end of the low-voltage power supply contactor 33 to control the discharge of the high-voltage system 4.

[0027] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system starting charge and discharge control circuit, the input end of the circuit module 31 is maintained connected to the negative pole of the low-voltage battery 1 and the output end of the control switch 2, so that the low-voltage battery 1 supplies power to the circuit module 31 by operating the control switch 2, and the low-voltage starting relay 32 is powered by the power supply of the circuit module 31.

[0028] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, the high-voltage system 4 includes a high-voltage battery management system 41 and a high-voltage battery 42. The control end of the high-voltage battery management system 41 is communicatively connected to the logic control module 34, and the output end of the high-voltage battery 42 is connected to the input end of the high-voltage battery management system 41. The output end of the high-voltage battery management system 41 is connected to the high-voltage equipment, so that the high-voltage battery 42 is controlled to be charged and discharged through the high-voltage battery management system 41, and the logic control module 34 is used to form corresponding control with the high-voltage battery management system 41 through the communication bus, so as to realize the control of the high-voltage system 4 to discharge smoothly after the logic control module 34 is powered on.

[0029] Furthermore, in the above-mentioned heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, the input end of the DC converter 5 is connected to the output end of the high-voltage battery management system 41, and the output end of the DC converter 5 is connected to the low-voltage battery 1. Therefore, when the low-voltage battery 1 is out of power, the high-voltage battery 42 passes through, and the DC converter 5 charges the low-voltage battery 1 and supplies power to the low-voltage equipment at the same time, thereby improving the endurance.

[0030] The startup charge and discharge control method of the heavy-duty AGV high-voltage power supply system of the present invention includes:

[0031] Launch Control: Figure 2 As shown, the control switch 2 is rotated to the closed position, the low-voltage starting relay 32 is energized and closed, and its normally open contact is closed, controlling the low-voltage power supply contactor 33 to be closed. At this time, the low-voltage battery 1 supplies power to the low-voltage equipment of the entire vehicle, and controls the high-voltage battery management system 41 through the logic control module 34 to send a discharge signal to the high-voltage battery 42. At this time, the high-voltage battery 42 continuously and stably outputs current. When the power of the low-voltage battery 1 is too low, the DC converter 5 outputs a 24V voltage to supply power to the low-voltage equipment of the entire vehicle and charge the low-voltage battery 1, thereby improving the overall endurance.

[0032] Shutdown control: Turn the control switch 2 to the off position. The logic control module 34 detects the off state of the control switch 2 and controls the high-voltage battery management system 41 to send a stop-discharge signal to the high-voltage battery 42. The high-voltage battery 42 stops discharging, the DC converter 5 stops working, the low-voltage starting relay 32 loses power and disconnects, and the low-voltage power supply contactor 33 is controlled to disconnect. At this time, the circuit module 31 controls the main power supply to be turned off.

[0033] Charging control: When charging a heavy-loaded AGV, the logic control module 34 detects the charging gun and controls the high-voltage system 4 to charge, and charges the low-voltage battery 1 through the DC converter 5. When the logic control module 34 abnormally pulls the gun or the system is abnormal, the logic control module 34 controls the high-voltage system 4 to stop charging.

[0034] In summary, compared with the prior art, the heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit and method of the present invention has the following advantages and beneficial effects:

[0035] The present invention utilizes a low-voltage control system to control the high-voltage system to separately control the power supply of the AGV high and low voltage power supplies, effectively meeting the frequent high-power output of the AGV, effectively reducing the time and cost required for AGV parking maintenance, and ensuring the stability of work and service life.

[0036] It should be noted that, in this document, unless otherwise expressly specified or limited, the term "connected" or its synonyms should be interpreted broadly. For example, "connected" can mean a fixed or removable connection; a mechanical or electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication between two elements or the interaction between two elements. A person of ordinary skill in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, expressions such as "first" and "second" are used solely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Furthermore, the terms "front," "rear," "left," "right," "upper," and "lower" herein are used with reference to the positions shown in the accompanying drawings.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A heavy-load AGV high-voltage power supply system startup charge and discharge control circuit, characterized in that: The heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit includes a low-voltage battery, a control switch, a low-voltage control system, a high-voltage system and a DC converter. The low-voltage battery is used to provide a control voltage. The control switch input end is connected to the positive electrode of the low-voltage battery for controlling the discharge of the low-voltage battery. The low-voltage control system is connected to the negative electrode of the low-voltage battery and the output end of the control switch for supplying energy to the low-voltage equipment and sending or receiving control information. The high-voltage system control startup end is connected to the low-voltage control system signal for receiving the low-voltage control system control information and providing directional power to the high-voltage equipment. The DC converter is arranged between the low-voltage battery and the high-voltage system for charging the low-voltage battery and powering the low-voltage control system, wherein: The low-voltage control system includes a holding circuit module, a low-voltage starting relay, a low-voltage power supply contactor and a logic control module. The holding circuit module is used to control the power on and off. The input end of the low-voltage starting relay is connected to the output end of the holding circuit module to provide a starting control signal. The input end of the low-voltage power supply contactor is connected to the output end of the low-voltage starting relay to control the power supply to the AGV low-voltage load. The input end of the logic control module is connected to the output end of the low-voltage power supply contactor to control the discharge of the high-voltage system.

2. The heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit according to claim 1 is characterized in that: The input end of the holding circuit module is connected to the negative electrode of the low-voltage battery and the output end of the control switch.

3. The heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit according to claim 1, characterized in that: The high-voltage system includes a high-voltage battery management system and a high-voltage battery. The high-voltage battery management system control end is communicatively connected to the logic control module, the high-voltage battery output end is connected to the high-voltage battery management system input end, and the high-voltage battery management system output end is connected to the high-voltage equipment.

4. The heavy-load AGV high-voltage power supply system startup charge and discharge control circuit according to claim 3 is characterized in that: The DC converter input end is connected to the high-voltage battery management system output end, and the DC converter output end is connected to the low-voltage battery.

5. A control method implemented by using the heavy-duty AGV high-voltage power supply system startup charge and discharge control circuit according to any one of claims 1 to 4, characterized in that: The heavy-load AGV high-voltage power supply system startup charge and discharge control method includes: Start control: Turn the control switch to the closed position, the low-voltage start relay is energized and closed, its normally open contacts are closed, and the low-voltage power supply contactor is controlled to close. The low-voltage battery supplies power to the low-voltage equipment of the vehicle, and the high-voltage system is controlled to discharge through the logic control module. At the same time, the DC converter outputs 24V voltage to power the low-voltage equipment of the vehicle and charge the low-voltage battery; Shutdown control: Turn the control switch to the off position. The logic control module detects the off state of the control switch and controls the high-voltage system to stop discharging, the DC converter to stop working, the low-voltage starting relay to lose power and disconnect, and controls the low-voltage power supply contactor to disconnect; Charging control: When charging a heavy-loaded AGV, the logic control module detects the charging gun and controls the high-voltage system to charge, and charges the low-voltage battery through the DC converter. When the logic control module abnormally pulls the gun or the system is abnormal, the logic control module controls the high-voltage system to stop charging.

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