Discharge control circuit of AGV (Automatic Guided Vehicle)

Abstract

The utility model discloses a discharge control circuit of an AGV dolly. The discharge control circuit comprises a key switch, a first contactor, a DC-DC converter, a motor controller and a power supply. One end of the key switch is connected with the positive electrode of the power supply, the other end of the key switch is connected with the input end of the DC-DC converter, the output end of the DC-DC converter is electrically connected with the coil end of the first contactor, the input end of the first contactor is electrically connected with the positive electrode of the power supply, and the output end of the DC-DC converter is electrically connected with the coil end of the second contactor. And the output end of the first contactor is connected with the input end of the motor controller. And the other end of the key switch is also electrically connected with an ignition switch control end of the motor controller. According to the utility model, the accuracy of battery discharge control of the AGV trolley can be improved, and the energy consumption of the AGV trolley can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of discharge control of an AGV trolley, and more specifically, to a discharge control circuit of an AGV trolley. Background Art

[0002] The AGV controls a series of automatic operations through instructions from the upper system. When there is no new work instruction, the AGV waits for the task to be issued at a fixed position. Over time, it will inevitably consume a lot of batteries. In order to prevent the battery from being over-discharged and affecting the battery life, the AGV usually needs to be shut down. Under normal circumstances, after shutting down, the electrical parts of the AGV will continue to consume power when the battery is charged. After a long time, the battery may still be over-discharged, causing the power loss of the AGV. Therefore, how to accurately control the discharge of the AGV to avoid over-discharge of the battery is of great significance. Utility Model Content

[0003] The utility model provides a discharge control circuit for an AGV trolley, which solves the problem of battery over-discharge when the existing AGV trolley is parked, can improve the accuracy of battery discharge control of the AGV trolley, and reduce the energy consumption of the AGV trolley.

[0004] In order to achieve the above objectives, the utility model provides the following technical solutions:

[0005] A discharge control circuit for an AGV vehicle, comprising: a key switch, a first contactor, a DC-DC converter, a motor controller and a power supply;

[0006] One end of the key switch is connected to the positive electrode of the power supply, the other end of the key switch is connected to the input end of the DC-DC converter, the output end of the DC-DC converter is electrically connected to the coil end of the first contactor, the input end of the first contactor is electrically connected to the positive electrode of the power supply, and the output end of the first contactor is connected to the input end of the motor controller;

[0007] The other end of the key switch is also electrically connected to the ignition switch control end of the motor controller;

[0008] When the key switch is closed, the power supply supplies power to the coil end of the first contactor through the DC-DC converter, so that the first contactor is closed, so as to connect the positive electrode of the power supply to the motor controller, and enable the motor controller to operate the AGV;

[0009] When the key switch is turned off, the electrical connection between the power supply and the motor controller is disconnected, and the motor controller loses power.

[0010] Preferably, it also includes: a battery controller and a second contactor;

[0011] The second contactor is connected in series between the power supply and the first contactor, and the coil end of the second contactor is signal-connected to the output end of the battery controller;

[0012] The control end of the battery controller is electrically connected to one end of the key switch. When the key switch is closed, the output end of the battery controller outputs a high level to close the second contactor to conduct the electrical connection between the power supply and the first contactor.

[0013] Preferably, it also includes: a warning light;

[0014] The warning light is electrically connected to the output end of the DC-DC converter, and is arranged in parallel with the coil end of the first contactor. When the key switch is closed, the warning light is lit.

[0015] Preferably, it also includes: a first fuse;

[0016] The first fuse is connected in series between the DC-DC converter and the warning light to perform current limiting protection on the warning light.

[0017] Preferably, it also includes: a second fuse;

[0018] The second fuse is connected in series between the key switch and the positive electrode of the power supply.

[0019] Preferably, it also includes: a third fuse;

[0020] The third fuse is connected in series between the first contactor and the motor controller to perform current limiting protection on the motor controller.

[0021] Preferably, the DC-DC converter converts 48V direct current into 24V direct current.

[0022] Preferably, the power source is a lithium battery.

[0023] The utility model provides a discharge control circuit for an AGV trolley, wherein a first contactor is connected in series between the power supply and the motor controller of the AGV trolley, and the power supply, the key switch, the DC-DC converter and the coil end of the first contactor are connected in series. The first contactor is controlled to be turned on or off by closing or opening the key switch to control the motor controller to start or stop. The problem of battery over-discharge when the existing AGV trolley is parked is solved, the accuracy of battery discharge control of the AGV trolley can be improved, and the energy consumption of the AGV trolley can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below.

[0025] Figure 1 The utility model is a schematic diagram of a discharge control circuit of an AGV car. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present utility model, the embodiments of the present utility model are further described in detail below in conjunction with the accompanying drawings and implementation methods.

[0027] Aiming at the problem of battery over-discharge when the current AGV trolley is parked, the utility model provides a discharge control circuit for an AGV trolley, which solves the problem of battery over-discharge when the existing AGV trolley is parked, can improve the accuracy of battery discharge control of the AGV trolley, and reduce the energy consumption of the AGV trolley.

[0028] like Figure 1 As shown, a discharge control circuit of an AGV trolley includes: a key switch 5, a first contactor 1, a DC-DC converter 4, a motor controller 11 and a power supply 9. One end of the key switch 5 is connected to the positive electrode of the power supply 9, the other end of the key switch 5 is connected to the input end of the DC-DC converter 4, the output end of the DC-DC converter 4 is electrically connected to the coil end of the first contactor 1, the input end of the first contactor 1 is electrically connected to the positive electrode of the power supply 9, and the output end of the first contactor 1 is connected to the input end of the motor controller 11. The other end of the key switch 5 is also electrically connected to the ignition switch control end KSI of the motor controller 11. When the key switch is closed, the power supply supplies power to the coil end 1-1 of the first contactor through the DC-DC converter, so that the first contactor 1 is closed, so as to conduct the positive electrode of the power supply to the motor controller, and the motor controller operates the AGV trolley. When the key switch is disconnected, the electrical connection between the power supply and the motor controller is disconnected, and the motor controller loses power.

[0029] Specifically, the first contactor is connected in series between the power supply and the motor controller of the AGV trolley to control the electrical connection between the power supply and the motor controller, and the power supply, the key switch, the DC-DC converter and the coil end of the first contactor are connected in series. When the key switch is closed, the power supply converts the voltage into a high product setting voltage through the DC-DC converter, supplies power to the coil end of the first contactor, closes the first contactor, and conducts the electrical connection between the power supply and the motor controller. At the same time, the power supply supplies power to the ignition switch control end KSI in the motor controller through the key switch. After the motor controller is powered, it controls the running motor of the AGV trolley to make the AGV trolley operate according to the instruction requirements. When the key switch is disconnected, the electrical connection between the power supply and the DC-DC converter is disconnected, so that the coil end of the first contactor loses power, and then the first contactor disconnects the electrical connection between the power supply and the motor controller, the motor controller loses power, and the AGV trolley stops running. The system can make the electrical connection of the power supply to the motor controller be turned on or off as the key switch is closed or disconnected, which can improve the accuracy of the battery discharge control of the AGV trolley and reduce the energy consumption of the AGV trolley.

[0030] The circuit also includes: a battery controller 7 and a second contactor 8; the second contactor 8 is connected in series between the power supply 9 and the first contactor 1, and the coil end of the second contactor 8 is signal-connected to the output end of the battery controller 7; the control end of the battery controller 7 is electrically connected to one end of the key switch 5, and when the key switch 5 is closed, the output end of the battery controller 7 outputs a high level, so that the second contactor 8 is closed to conduct the electrical connection between the power supply and the first contactor.

[0031] The circuit also includes: a warning light 2; the warning light 2 is electrically connected to the output end of the DC-DC converter 4, and the warning light 2 is arranged in parallel with the coil end 1-1 of the first contactor, and when the key switch 5 is closed, the warning light 2 lights up.

[0032] The circuit further includes: a first fuse 3; the first fuse 3 is connected in series between the DC-DC converter 4 and the warning light 2 to perform current limiting protection on the warning light.

[0033] The circuit further comprises: a second fuse 6; the second fuse is connected in series between the key switch and the positive electrode of the power supply.

[0034] The circuit further includes: a third fuse 10 ; the third fuse 10 is connected in series between the first contactor 1 and the motor controller 11 to perform current limiting protection on the motor controller 11 .

[0035] Furthermore, the DC-DC converter 4 converts 48V DC power into 24V DC power.

[0036] Furthermore, the power source is a lithium battery.

[0037] In actual application, turn on the key switch 5, the power supply 9 voltage supplies power to the input end of the DC-DC converter 4 through the key switch 5, and the output voltage of the DC-DC converter 4 supplies power to the warning light 2 through the fuse 3 to light it up. At the same time, the first contactor coil end 1-1 is energized, the first contactor contact edge is closed, and the power supply 9 voltage is powered on the motor controller 11 ignition switch KSI and the battery controller BMS control end through the key switch 5. The output end OUT of the battery controller BMS is high, the second contactor coil end 8-1 is energized, and the contactor contacts are energized. At this time, the motor controller 11 circuit is energized, and the AGV is powered on normally.

[0038] Turn off the key switch 5, the control end of the battery controller BMS loses power, the output end OUT of the battery controller BMS is at a low level, the contactor coil 8-1 loses power, the contactor contact 8-2 is disconnected, and at the same time, the input end of the DC-DC converter 4 and the ignition switch KSI of the motor controller 11 lose power, the output end of the DC-DC converter 4 has no voltage, the warning light 2 goes out, the first contactor coil 1-1 loses power, the first contactor contact is disconnected, and the motor controller 11 is powered off, all electrical components have no voltage, and the AGV is powered off normally.

[0039] It can be seen that the utility model provides a discharge control circuit for an AGV trolley, which uses a first contactor connected in series between the power supply and the motor controller of the AGV trolley, and the power supply, key switch, DC-DC converter and the coil end of the first contactor are connected in series. The first contactor is controlled to be turned on or off by closing or opening the key switch to control the motor controller to start or stop. The problem of battery over-discharge when the existing AGV trolley is parked is solved, the accuracy of battery discharge control of the AGV trolley can be improved, and the energy consumption of the AGV trolley can be reduced.

[0040] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation as shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. A discharge control circuit for an AGV, characterized in that: Includes: key switch, first contactor, DC-DC converter, motor controller and power supply; One end of the key switch is connected to the positive electrode of the power supply, the other end of the key switch is connected to the input end of the DC-DC converter, the output end of the DC-DC converter is electrically connected to the coil end of the first contactor, the input end of the first contactor is electrically connected to the positive electrode of the power supply, and the output end of the first contactor is connected to the input end of the motor controller; The other end of the key switch is also electrically connected to the ignition switch control end of the motor controller; When the key switch is closed, the power supply supplies power to the coil end of the first contactor through the DC-DC converter, so that the first contactor is closed, so as to connect the positive electrode of the power supply to the motor controller, and enable the motor controller to operate the AGV; When the key switch is turned off, the electrical connection between the power supply and the motor controller is disconnected, and the motor controller loses power.

2. The discharge control circuit of the AGV according to claim 1 is characterized in that: Also includes: Battery controller and second contactor; The second contactor is connected in series between the power supply and the first contactor, and the coil end of the second contactor is signal-connected to the output end of the battery controller; The control end of the battery controller is electrically connected to one end of the key switch. When the key switch is closed, the output end of the battery controller outputs a high level to close the second contactor to conduct the electrical connection between the power supply and the first contactor.

3. The discharge control circuit of the AGV according to claim 2 is characterized in that: Also includes: Warning lights; The warning light is electrically connected to the output end of the DC-DC converter, and is arranged in parallel with the coil end of the first contactor. When the key switch is closed, the warning light is lit.

4. The discharge control circuit of the AGV according to claim 3 is characterized in that: Also includes: First fuse; The first fuse is connected in series between the DC-DC converter and the warning light to perform current limiting protection on the warning light.

5. The discharge control circuit of the AGV according to claim 4 is characterized in that: Also includes: Second fuse; The second fuse is connected in series between the key switch and the positive electrode of the power supply.

6. The discharge control circuit of the AGV according to claim 5, characterized in that: Also includes: The third fuse; The third fuse is connected in series between the first contactor and the motor controller to perform current limiting protection on the motor controller.

7. The discharge control circuit of the AGV according to claim 6 is characterized in that: The DC-DC converter converts 48V DC power into 24V DC power.

8. The discharge control circuit of the AGV according to any one of claims 1 to 7, characterized in that: The power source is a lithium battery.

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