EPS battery monitoring system

Abstract

The utility model provides an EPS battery monitoring system, which comprises a PLC, a DC voltage detector, a DC power supply, a contactor, an alarm prompter, a current-limiting resistor and an LED digital display tube, the DC voltage detector is connected with an anode of an EPS battery, and cathodes of the EPS battery are connected together to serve as a common line to enter a BATE-terminal of an itinerant detector; the positive electrode of an EPS battery is sequentially connected with a current-limiting resistor, a contactor and the output end of a PLC, the input end of the PLC is connected with an activation button, a start button, a stop button and a noise reduction button, and the output end of the PLC is connected with an operation indicator light and a stop indicator light. A negative electrode of the direct-current power supply is connected with a negative electrode of the EPS battery; the direct-current power supply is connected with the direct-current voltage detector and the LED digital display tube; and the PLC, the direct-current voltage detector and the LED digital display tube are respectively connected with the communication bus through the A + interface and the B-interface. According to the utility model, the state of the battery can be monitored in real time, an alarm is given when the battery fails, the failed battery is activated automatically, and the monitored information is displayed through the display screen.

Description

Technical Field

[0001] The utility model belongs to the technical field of emergency power supply systems, in particular to an EPS battery monitoring system. Background Art

[0002] EPS is mainly aimed at solving the power supply problems of primary loads such as emergency lighting, accident lighting, and fire-fighting facilities. It provides an emergency power supply system with an independent circuit that complies with fire-fighting regulations. The system can provide emergency power supply in emergency situations to solve the problem of lighting power or only one mains power supply and lack of a second power supply, or to replace the generator set to form a second power supply, or to be used in situations where a third power supply is needed.

[0003] As the second power source, EPS mainly consists of batteries, rectifier circuits, inverter circuits, filter circuits and reactance circuits. When the city power is not available, EPS automatically switches to the backup power source. The principle is that the battery discharges to the inverter. After the inverter, it outputs three-phase AC (AC380V) to the load circuit. The length of the output time after the EPS inverter is closely related to the battery capacity and the size of the battery.

[0004] CRRC Changchun Railway Vehicles Co., Ltd. currently has 38 EPSs at its high-speed base, each with 42 batteries, for a total of nearly 1,600 batteries. The unit price of each battery is more than RMB 3,000, with a total construction cost of RMB 4.8 million. If the EPS battery is not charged for a long time, it will starve to death, and the voltage status of each battery is unknown. During regular inspections, the specific values ​​cannot be visually detected due to objective reasons, which often leads to battery failure after starvation. During use, malfunctions will occur, resulting in failure to start switching, usage time not reaching the target or ideal state, and failure to meet technical parameters. In emergency situations, the EPS is often unusable, posing a greater hidden danger. Causes of starvation: (1) The battery self-discharge current is higher than the charging current due to long storage time, and it is not maintained and charged. (2) Continuous over-discharge and no timely recharging within 24 hours. (3) Overcharging or frequent undercharging caused by environmental factors, mainly due to excessively high or low temperatures. Utility Model Content

[0005] The utility model aims to solve the problem that battery failure cannot be discovered and handled in time after battery starvation, thereby providing an EPS battery monitoring system that can monitor the EPS battery status in real time, activate the failed battery, and display the monitored information on a display screen.

[0006] In order to achieve the above-mentioned utility model purpose, the utility model provides an EPS battery monitoring system, PLC, DC voltage detector, DC power supply, contactor, alarm prompter, current limiting resistor, LED digital display tube, the DC voltage detector is connected to the positive electrode of the EPS battery, and the negative electrode of the EPS battery is connected together as a common line to enter the BATE-terminal of the inspection instrument; the positive electrode of the EPS battery is sequentially connected to the current limiting resistor, the contactor and the PLC output end, the PLC input end is connected to the activation button, the start button, the stop button and the mute button, and the PLC output end is connected to the running indicator light and the stop indicator light; the contactor is connected to the positive electrode of the DC power supply, and the negative electrode of the DC power supply is connected to the negative electrode of the EPS battery; the DC power supply is connected to the DC voltage detector and the LED digital display tube; the PLC, the DC voltage detector, and the LED digital display tube are respectively connected to the communication bus through the A+ and B- interfaces;

[0007] The DC voltage detector is used to send the detected voltage of each battery to the PLC via the communication bus;

[0008] The PLC is used to determine whether the voltage of each battery is greater than 11V or the difference with other battery voltages exceeds 5%. If so, the PLC sends a battery good signal to the alarm prompter. If not, the PLC sends an alarm signal to the alarm prompter and sends the faulty battery number and voltage value to the LED digital display tube for display. The PLC is used to convert and transmit the instructions of the activation button, the start button, the stop button and the mute button to the contactor, the running indicator light, the stop indicator light and the alarm prompter respectively;

[0009] The start button is used to start the system operation;

[0010] The activation button is used to activate the faulty battery. After pressing the start button, press the activation button corresponding to the faulty battery to start the activation. The main contact of the contactor corresponding to the faulty battery is closed, and the DC power supply output DC24V passes through the main contact of the contactor corresponding to the faulty battery, and then reaches the positive electrode of the faulty battery through the current limiting resistor to activate the battery, and automatically stops at the set time;

[0011] The stop button is used to manually stop the system operation;

[0012] The mute button is used to eliminate the stop warning sound.

[0013] There is no monitoring system specifically for EPS batteries in the market. Our EPS battery monitoring system can monitor the battery status in real time, alarm when the battery fails, automatically activate the failed battery, and display the monitored information on the display screen. In addition, this inspection instrument can be connected to any device or smart terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is the circuit diagram of the EPS battery monitoring system of the utility model;

[0015] Figure 2 This is the working flow chart of the EPS battery monitoring system of the utility model. DETAILED DESCRIPTION

[0016] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of an EPS battery monitoring system of the utility model in conjunction with the accompanying drawings.

[0017] Reference Figure 1 The EPS battery monitoring system includes EPS battery, PLC model CX2424-CN, DC voltage detector VX-IM20TFT-V100, DC power supply WAGO 787-712, contactor LCD1D38, homemade twisted pair cable RS485, alarm prompter YJ1, current limiting resistor, LED digital display tube. The size of the resistor depends on the maximum charging current parameter of the battery itself.

[0018] V0, V1, V2, V3, V4, V5, V6, and V7 of the DC voltage detector VX-IM20TFT-V100 are connected to the positive electrodes of batteries BATE0, BATE1, BATE2, BATE3, BATE4, BATE5, BATE6, and BATE7 respectively. The negative electrodes of batteries BATE0, BATE1, BATE2, BATE3, BATE4, BATE5, BATE6, and BATE7 are connected together as a common line to enter the BATE-terminal of the inspection instrument. The voltage value of each battery is displayed at the position marked ## on the detector. The positive poles of batteries BATE0, BATE1, BATE2, BATE3, BATE4, BATE5, BATE6, and BATE7 are connected to current limiting resistors R1, R2, R3, R4, R5, R6, R7, and R8 respectively. R1, R2, R3, R4, R5, R6, R7, and R8 are connected to contactors KM1, KM2, KM3, KM4, KM5, KM6, KM7, and KM8 respectively. KM1 and contactors KM2, KM3, KM4, KM5, KM6, KM7, and KM8 are connected to PLC output interfaces 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 1.2 respectively. The PLC outputs 0.0-0.6 and 1.2 control the contactor KM1-KM8 coils to realize the closure of the main contacts of KM1-KM8. The activation buttons SB1, SB2, SB3, SB4, SB5, SB6, SB7, and SB8 are connected to the PLC input interfaces 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 0.7 respectively, and their function is to manually activate the main contacts of the contactors connected to the corresponding output interfaces 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, and 1.2 to close or disconnect, thereby activating the corresponding batteries BATE0, BATE1, BATE2, BATE3, BATE4, BATE5, BATE6, and BATE7. The PLC output interface 1.1 is connected to the alarm prompter YJ1, and the PLC output interfaces 0.7 and 1.0 are connected to the running indicator light XL0 and the stop indicator light XL1 respectively, and their function is to indicate the operation and stop of the system. The start button SB9 and the stop button SB10 are connected to the PLC input interfaces 1.0 and 1.1, and their function is to start and stop the EPS battery comprehensive application unit. The mute button SB11 is connected to the PLC input interface 1.2, and its function is to mute the YJ1 alarm bell. The PLC is used to convert and transmit the instructions of the activation button, start button, stop button and mute button to the contactor, run indicator light, stop indicator light and alarm prompter respectively.

[0019] The DC power supply is connected to the DC voltage detector and the LED digital display tube to supply power to the DC voltage detector and the LED digital display tube. The positive pole of the DC power supply is connected to contactors KM1, KM2, KM3, KM4, KM5, KM6, KM7, and KM8, and the negative pole is connected to the negative pole of the battery.

[0020] PLC, DC voltage detector, LED digital display tube are connected to the communication bus through A+ and B- interfaces respectively. The battery voltage detected by the DC voltage detector is sent to PLC through the communication bus. PLC determines whether the voltage of each battery is greater than 11V or the difference with other battery voltages exceeds 5%. If so, PLC sends a battery good signal to the LED digital display tube; if not, PLC sends an alarm signal to the alarm prompter, the alarm prompter emits a warning sound, and sends the faulty battery number and voltage value to the LED digital display tube for display. After hearing the warning sound, the staff presses the mute button to stop the warning sound, and then presses the start button SB9 to start the system operation. At this time, the operation indicator XL0 lights up, and then presses the activation button corresponding to the faulty battery in the activation button SB1-SB8 to start the activation. The main contact of the contactor corresponding to the faulty battery is closed, and the DC power supply output DC24V passes through the main contact of the contactor corresponding to the faulty battery, and then reaches the positive pole of the faulty battery through the current limiting resistor. The battery is activated by a voltage twice the rated voltage of a single EPS battery. The activation setting time is 0.5 hours, and it stops automatically when the setting time is reached. If you encounter other battery failures, you can press the stop button SB10 to manually stop the system. At this time, the stop indicator XL1 lights up. After the battery is activated, the DC voltage detector detects the battery voltage again and monitors the battery status in a cycle. The number of batteries may be adjusted according to actual needs.

Claims

1. An EPS battery monitoring system, characterized in that: PLC, DC voltage detector, DC power supply, contactor, alarm prompter, current limiting resistor, LED digital display tube, DC voltage detector is connected to the positive pole of EPS battery, and the negative pole of EPS battery is connected together as a common line to enter the BATE- terminal of the inspection instrument; the positive pole of EPS battery is connected to the current limiting resistor, contactor and PLC output terminal in sequence, the PLC input terminal is connected to the activation button, start button, stop button and mute button, and the PLC output terminal is connected to the running indicator light and the stop indicator light; the contactor is connected to the positive pole of DC power supply, and the negative pole of DC power supply is connected to the negative pole of EPS battery; the DC power supply is connected to the DC voltage detector and the LED digital display tube; the PLC, DC voltage detector, and LED digital display tube are connected to the communication bus through the A+ and B- interfaces respectively; The DC voltage detector is used to send the detected voltage of each battery to the PLC via the communication bus; The PLC is used to determine whether the voltage of each battery is greater than 11V or the difference with other battery voltages exceeds 5%. If so, the PLC sends a battery good signal to the alarm prompter. If not, the PLC sends an alarm signal to the alarm prompter and sends the faulty battery number and voltage value to the LED digital display tube for display. The PLC is used to convert and transmit the instructions of the activation button, the start button, the stop button and the mute button to the contactor, the running indicator light, the stop indicator light and the alarm prompter respectively; The start button is used to start the system operation; The activation button is used to activate the faulty battery. After pressing the start button, press the activation button corresponding to the faulty battery to start the activation. The main contact of the contactor corresponding to the faulty battery is closed, and the DC power supply output DC24V passes through the main contact of the contactor corresponding to the faulty battery, and then reaches the positive electrode of the faulty battery through the current limiting resistor to activate the battery, and automatically stops at the set time; The stop button is used to manually stop the system operation; The mute button is used to eliminate the stop warning sound.

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