Lead-acid battery discharge protection circuit applied to agv

Abstract

The utility model discloses a lead -acid battery discharge protection circuit for AGV, and lead -acid battery positive pole outgoing line is connected to contactor main contact, is connected to the electric load anode after leading out by contactor main contact, and the outgoing line of lead -acid battery negative pole is directly connected to the electric load cathode, another wire of lead -acid battery positive pole leading out is connected to circuit breaker, and the output of circuit breaker is connected to selection switch, and the output of selection switch is connected switch power supply anode input, another wire of lead -acid battery negative pole leading out is connected switch power supply cathode, and the positive pole and negative pole of switch power supply output end are led out respectively and are connected to contactor coil positive pole and negative pole, and the B1 end of contactor auxiliary contact is connected DC24V power supply cathode, and the other end is connected host computer on -off quantity input point. Utilize the application scheme to be able to carry out effective control to lead -acid battery discharge, and the effect is better, and it is convenient to promote and use on industry.

Description

Technical Field

[0001] This utility model relates to the field of AGV battery discharge protection technology, and in particular to a lead-acid battery discharge protection circuit applied to AGVs. Background Technology

[0002] Currently, AGVs use lead-acid batteries to power copper busbars, which in turn supply power to multiple power circuits. However, the output terminals of the lead-acid batteries and the input terminals of the power circuits are always energized, causing inconvenience for later maintenance and repair, and even increasing the risk of electric shock to workers.

[0003] To address the aforementioned issues, low-voltage, low-current lead-acid batteries can be controlled by connecting a series switch for discharge control. However, for high-voltage, high-current lead-acid batteries, especially those used in power circuits, the discharge circuit diameter is too large, making wiring inconvenient. Conventional switches cannot meet the current carrying and voltage withstand capabilities, posing a risk of breakdown. Furthermore, the wire diameter is too large, making wiring inconvenient. Utility Model Content

[0004] In view of the technical problems mentioned in the background, the purpose of this utility model is to provide a lead-acid battery discharge protection circuit for AGVs.

[0005] To achieve the objectives of this utility model, the technical solution provided by this utility model is as follows:

[0006] A lead-acid battery discharge protection circuit for AGVs includes a lead-acid battery positive terminal wire connected to the main contacts of a contactor, which then leads to the positive terminal of the electrical load. A lead-acid battery negative terminal wire is directly connected to the negative terminal of the electrical load. Another lead-acid battery positive terminal wire is connected to a circuit breaker, and the circuit breaker output wire is connected to a selector switch. The selector switch output wire is connected to the positive input of a switching power supply. A third lead-acid battery negative terminal wire is connected to the negative terminal of the switching power supply. Positive and negative output wires from the switching power supply are connected to the positive and negative terminals of the contactor coil.

[0007] The auxiliary contact B1 of the contactor is connected to the negative terminal of the DC24V power supply, and the other end is connected to the switch input point of the host computer.

[0008] The contactor is a DC contactor.

[0009] The selection switch is a self-holding selection switch.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] The solution proposed in this application can effectively control the discharge of lead-acid batteries, with good results, and is easy to promote and use in industry. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the first part of the circuit in the embodiment of this application;

[0013] Figure 2 This is a schematic diagram of the second part of the circuit in the embodiment of this application;

[0014] Figure 3 This is a schematic diagram of the structure of the DC contactor in the embodiments of this application;

[0015] In the diagram, 10-lead-acid battery, 11-DC contactor main contact, 12-electrical load, 13-circuit breaker, 14-self-holding selector switch, 15-switching power supply, 16-DC contactor coil, 20-DC24V power supply, 21-DC contactor auxiliary contact, 22-host computer, 23-DC contactor. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1-3 As shown, this embodiment provides a lead-acid battery discharge protection circuit for AGVs, including a DC contactor main contact 11, a circuit breaker 13, a self-holding selector switch 14, a switching power supply 15, a DC contactor coil 16, a DC 24V power supply 20, a DC contactor auxiliary contact 21, a host computer 22, and a DC contactor 23. The positive terminal of the lead-acid battery 10 is connected to the DC contactor main contact 11, and from there, it is connected to the positive terminal of the electrical load 12. The negative terminal is directly connected to the negative terminal of the electrical load 12. Another wire from the positive terminal of the lead-acid battery 10 is connected to the circuit breaker 13. The output of the circuit breaker 13 is connected to the self-holding selector switch 14, and the output of the self-holding selector switch 14 is connected to the positive input of the switching power supply 15. Another wire from the negative terminal of the lead-acid battery is connected to the negative terminal of the switching power supply 15. The positive and negative output terminals of the switching power supply 15 are respectively connected to the positive and negative terminals of the DC contactor coil 16.

[0018] The B1 terminal of the auxiliary contact 21 of the DC contactor is connected to the negative terminal of the DC 24V power supply 20, and the other end is connected to the switch input point of the host computer 22.

[0019] Usage process:

[0020] Before the vehicle is powered on, the circuit breaker 13 is closed, the self-holding selector switch 14 is closed, the switching power supply 15 is powered on, and the output is DC24V. The low-voltage DC power flows out from the positive terminal of the switching power supply 15, passes through the DC contactor coil 16 and the normally closed contact of the relay, and returns to the negative terminal of the switching power supply 15 to form a circuit. The power-on circuit adopts a double insurance mechanism of circuit breaker 13 and self-holding selector switch 14.

[0021] In addition, the solution proposed in this application can detect whether the main contacts of the contactor are functioning properly, as detailed below:

[0022] After the self-holding selector switch 14 is closed, the DC contactor coil 16 is energized, the DC contactor main contact 11 is attracted, and the lead-acid battery 10 supplies power to the electrical appliance; the DC contactor auxiliary contact 21 is attracted, the host computer receives the signal and judges that the contactor main contact 11 is normal.

[0023] After the self-holding selector switch 14 is opened, the DC contactor coil 16 is de-energized, the DC contactor main contact 11 is opened, and the lead-acid battery 10 no longer supplies power to the electrical appliance; the DC contactor auxiliary contact 21 is opened, the host computer has no signal, and it is determined that the contactor main contact 11 is normal.

[0024] When the main contact 11 of the DC contactor becomes stuck, the self-holding selector switch 14 is opened, and the main contact 11 of the DC contactor and the auxiliary contact 21 of the DC contactor no longer disconnect. The lead-acid battery 10 will continue to supply power to the electrical appliance 12. The host computer 22 will continuously receive signals and determine that the main contact 12 of the DC contactor is faulty. The host computer 22 human-machine interface will display a fault alarm and prompt the user to replace the DC contactor 23.

[0025] Finally, it should be noted that the above embodiments are merely examples and illustrations of the present invention, and are not intended to limit the present invention to the scope of the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention.

Claims

1. A lead-acid battery discharge protection circuit for use in AGVs, characterized in that, The positive terminal of the lead-acid battery (10) is connected to the main contact (11) of the contactor. The lead-acid battery (10) leads out to the positive terminal of the electrical load (12). The negative terminal of the lead-acid battery (10) is directly connected to the negative terminal of the electrical load (12). Another wire from the positive terminal of the lead-acid battery (10) is connected to the circuit breaker (13). The output of the circuit breaker (13) is connected to the selector switch (14). The output of the selector switch (14) is connected to the positive input of the switching power supply (15). Another wire from the negative terminal of the lead-acid battery is connected to the negative terminal of the switching power supply (15). The positive and negative terminals of the output of the switching power supply (15) are led out and connected to the positive and negative terminals of the contactor coil (16). The auxiliary contact (21) B1 of the contactor is connected to the negative terminal of the DC24V power supply (20), and the other end is connected to the switch input point of the host computer (22).

2. The lead-acid battery discharge protection circuit for AGVs according to claim 1, characterized in that, The contactor is a DC contactor.

3. The lead-acid battery discharge protection circuit for AGVs according to claim 1, characterized in that, The selection switch (14) is a self-holding selection switch.

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