CN220399603U

CN220399603U - Accumulator low-voltage warning pre-test circuit for-48V communication power supply

Info

Publication number: CN220399603U
Application number: CN202321882546.5U
Authority: CN
Inventors: 朱亚; 邱祖雄; 王延明
Original assignee: Shanghai Taitan Communication Engineering Co ltd
Current assignee: Shanghai Taitan Communication Engineering Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2024-01-26
Anticipated expiration: 2033-07-17

Abstract

The utility model relates to a low-voltage warning pre-test circuit for a storage battery of a-48V communication power supply, which is characterized by comprising a direct-current voltmeter, a direct-current relay, a voltage dividing circuit, a test button and the like. The utility model can simply add a small device with a low-voltage alarm test button on the field-48V communication equipment, realize the low-voltage alarm test function with low cost, facilitate the field low-voltage alarm test simulation of the storage battery and also can be used as a redundant system of the low-voltage alarm of the communication power supply monitor. In addition, the utility model can be independent of the operation of the communication power supply monitor, so that the operation safety of the power supply system is improved. Therefore, the utility model has the functions of conveniently carrying out low-voltage alarm test, simplifying operation and maintenance and improving the operation safety of equipment.

Description

Accumulator low-voltage warning pre-test circuit for-48V communication power supply

Technical Field

The utility model relates to a low-voltage warning pre-test circuit of a storage battery, which is used in an existing-48V communication power supply system.

Background

At present, the communication power supply system of-48V in the market is provided with a monitor and storage battery packs of different capacities of 48V40AH-3000 AH. And when the alternating current is in power failure, the backup storage battery pack is used for supplying power to the load. When the battery is discharged to a certain threshold value (for example, when the voltage is lower than 48V), in order to avoid load power failure, a monitor is required to give an alarm to prompt an operation and maintenance party to go to the site for processing. When the monitor fails and crashes, the low discharge voltage alarm of the storage battery cannot be sent out in time. In normal factory testing and on-site operation maintenance, whether the alarm functions are normal or not needs to be monitored regularly, and the phenomenon that faults caused by the faults of the alarm circuits cannot be emitted actually is avoided.

The warning output signals commonly existing in the current communication power supply system are as follows: an AC power supply first power failure alarm, an AC power supply second power failure alarm, an AC lightning protection device fault alarm, a rectification module redundancy fault alarm, a DC lightning protection device fault alarm, a storage battery fuse fusing alarm, an input/output air-break tripping alarm, a storage battery voltage lower than 48V alarm and the like. The alarm is easy to test and simulate except that the battery voltage is lower than 48V. For example, the simulation of a power failure alarm of the alternating current power supply can be realized by closing an input switch of the alternating current power supply; the simulation of fault warning of the alternating current lightning protection device can be realized by pulling out the identical alternating current lightning protection device modules. However, if the voltage of the storage battery is lower than 48V in the field, the ac power supply needs to be turned off to discharge the load from the storage battery, and the discharge duration of the ac power supply can often reach hours or days to generate an alarm that the actual voltage of the storage battery is lower than 48V. Therefore, in the field of user equipment, because of the existence of a high-capacity storage battery pack, it is often difficult to perform alarm simulation test for low storage battery voltage, that is, whether the function of a user for alarming low storage battery discharge voltage is normal or not is often unable to be directly tested.

Disclosure of Invention

The utility model aims to solve the technical problems that: the existing-48V communication power supply system has difficulty in performing test simulation on the alarm that the voltage of the storage battery is lower than 48V.

In order to solve the technical problems, the technical scheme of the utility model is to provide a storage battery low-voltage warning pre-test circuit for a-48V communication power supply, wherein a direct current output end of the-48V communication power supply is connected with a load through a direct current positive electrode busbar copper bar and a direct current negative electrode busbar copper bar, and the load is connected with a storage battery in parallel; the normally open contact of the direct current relay is connected with the circuit midpoint of the voltage dividing circuit, and the normally closed contact of the direct current relay is connected with the direct current negative busbar copper bar; the voltage dividing circuit is connected with a coil of the direct current relay in parallel, and after the coil is electrically attracted, the common contact of the direct current relay is conducted with the normally-open contact and disconnected with the normally-closed contact, otherwise, the common contact of the direct current relay is conducted with the normally-closed contact and disconnected with the normally-open contact; one end of the voltage dividing circuit is connected with the direct current negative electrode busbar copper bar through the test button and the first fuse in series connection, and the other end of the voltage dividing circuit is connected with the direct current positive electrode busbar copper bar.

Preferably, the load is connected in series with a load switch.

Preferably, the battery pack is connected in series with a battery pack protection fuse.

Preferably, the voltage dividing circuit is formed by connecting a first voltage dividing resistor and a second voltage dividing resistor in series.

Preferably, a negative electrode in a power supply end of the direct current voltmeter is connected with the direct current negative electrode busbar copper bar through a fuse II.

The present utility model provides a small device (mainly composed of a DC voltmeter, a test button, a test relay, a voltage dividing circuit and the like) with a low-voltage alarm test button, which is simply added on site-48V communication equipment, and the low-voltage alarm test function is realized by using low cost, so that the simulation of the low-voltage alarm test of the storage battery can be conveniently carried out on site, and the system can also be used as a redundant system of the low-voltage alarm of the communication power supply monitor. In addition, the utility model can be independent of the operation of the communication power supply monitor, so that the operation safety of the power supply system is improved. Therefore, the utility model has the functions of conveniently carrying out low-voltage alarm test, simplifying operation and maintenance and improving the operation safety of equipment.

Compared with the prior art, the utility model has the following advantages:

1) The utility model realizes the simulation test function of the battery voltage lower than 48V alarm with very low cost, and can be conveniently tested by operation and maintenance personnel during normal operation; the utility model can also monitor the voltage of the storage battery in real time, and immediately send out an alarm signal when the voltage is lower than 48V to remind operators to check and maintain;

2) When the voltage of the storage battery is lower than 48V, the storage battery can locally display an acousto-optic alarm and simultaneously can also be sent to a background centralized monitoring system through a dry node and an RS232 signal, so that operation and maintenance personnel of a transformer substation can find out and intervene in time, and the overlarge fault range is avoided;

3) The utility model has low cost and strong portability, can be directly connected to the direct current bus of other brands of communication power sources, can effectively improve the monitoring capability of the storage battery during discharging and improves the operation safety of the system.

Drawings

FIG. 1 is an electrical schematic of the present utility model;

fig. 2 is a diagram of a dc relay pin in the present embodiment.

Detailed Description

The utility model is further illustrated below in connection with specific examples. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.

The utility model discloses a low-voltage warning pre-test circuit for a storage battery of a-48V communication power supply, which is characterized in that in a normal running environment of equipment, the direct-current bus voltage of the storage battery is simulated to be lower than 48V, and then warning is generated and sent to a monitoring device and a local acousto-optic display.

Based on the above-mentioned idea, as shown in fig. 1, a low-voltage warning pre-test circuit for a storage battery of a-48V communication power supply disclosed in this embodiment is added to an existing-48V switching power supply system U1, and in this embodiment, the-48V switching power supply rectifying system 1 is a 48V150A embedded power supply system, and includes 3 50A rectifying modules 1-1, 1-2, 1-3 and a monitor MCU2500.

The 50A rectifying modules 1-1, 1-2 and 1-3 are used for converting externally input alternating current into direct current, and the alternating current is connected to the-48V switching power supply system U1 through the input switch K1, wherein in the embodiment, the input switch K1 is an alternating current 380V 32A input control switch.

The monitor MCU2500 is provided with 1 path of RS232 communication port, the 1 and 2 pins in the output terminal row of the monitor MCU2500 are digital quantity input pins DI1 (the state is defined as when the 1 and 2 pins are short-circuited to be the storage battery voltage lower than 48V and alarm, then the LED lamp H10 is driven to be lightened), and the RS232 communication port reports the storage battery voltage lower than 48V alarm information message). Pins 9 and 11 in the output terminal row of the monitor MCU2500 are digital output pin DO3 (this function is not defined). The pins 15 and 16 in the output terminal row of the monitor MCU2500 are LED driving pins and are connected with the LED lamp H10.

The direct current output end of the 48V switching power supply system U1 is connected with a load through a direct current bus, and the load is connected with a load switch K2 in series and then connected with a lead-acid storage battery (48V 300 AH) and a lead-acid storage battery protection fuse BATT FULE in parallel. In this embodiment: the load switch K2 is a direct current load control switch and has a specification of C50P; the load is-48V communication equipment, and the capacity is below 2000W; the lead-acid storage battery pack is formed by connecting 24 sections of 2V300AH lead-acid storage batteries in series; the specification of the lead-acid storage battery protection fuse BATT FULE is 200A.

The embodiment discloses a low-voltage warning pre-test circuit for a storage battery of a-48V communication power supply, which comprises a direct-current voltmeter P1, and in the embodiment, the direct-current voltmeter is YD8432 of Hedyadic. The 17 (+) and 18 (-) pins of the DC voltmeter P1 are working power supply input pins, wherein the 17 (+) pin is connected with a DC positive bus copper bar, and the 18 (-) pin is connected with a DC negative bus copper bar through a FUSE 1. FUSE1 is a protection FUSE for dc voltmeter P1, and is of standard 125V6.3A. The 1 pin and the 2 pin of the direct current voltmeter P1 are measurement input pins, wherein the 1 pin of the direct current voltmeter P1 is connected with a direct current positive bus copper bar, and the 2 pin is connected with a common contact (9 pins) of the direct current relay K3. Pins 3 and 12 of the direct current voltmeter P1 are digital quantity output pins (when the measured value is lower than the set threshold value 48V, pins 3 and 12 are closed, otherwise, normally open), and are connected with a digital quantity input pin DI1 of the monitor MCU2500. The dc voltmeter P1 can set a low voltage warning threshold (48 VDC) by the panel key, and the warning delay is set to 3S. When the input voltage of pins 1 and 2 of the direct-current voltmeter P1 is lower than 48V, pins 3 and 12 of the direct-current voltmeter P1 are closed after 3S delay; when the input voltage of pins 1 and 2 of the direct-current voltmeter P1 is higher than 48V, pins 3 and 12 of the direct-current voltmeter P1 are kept in a normally open state.

As shown in fig. 2, in the present embodiment, the dc relay K3 (the operating voltage of the solenoid 54 VDC) outputs 4 sets of auxiliary contacts, wherein 9, 10, 11, 12 are common Contacts (COM) in each set of auxiliary contacts, 1, 2, 3, 4 are normally closed contacts (NC) in each set of auxiliary contacts, and 5, 6, 7, 8 are normally open contacts (NO) in each set of auxiliary contacts. In this embodiment, only 1 set of contacts, 9 (COM), 5 (N0), 1 (NC), of the dc relay K3 are used. The dc relay K3 has the coil operation pins 13 and 14, and when the coil operation pins 13 and 14 are not connected to the dc voltage 54V, the pins 1 and 9 are closed, and when the coil operation pins 13 and 14 are connected to the dc voltage 54VDC, the pins 1 and 9 are opened, and the pins 5 and 9 are closed.

The embodiment discloses a battery low-voltage warning pre-test circuit for a-48V communication power supply, which further comprises a voltage dividing circuit formed by connecting a direct-current voltage dividing resistor R1 (resistance 2.1K and power 1W) and a direct-current voltage dividing resistor R2 (resistance 10K and maximum power 1W) in series, wherein a normally open contact (5 pins) of a direct-current relay K3 is connected to a circuit midpoint of the voltage dividing circuit, and a normally closed contact (1 pins) of the direct-current relay K3 is connected with a direct-current negative busbar copper bar. One end of the voltage dividing circuit is connected with one end of the test button S1, and the other end of the voltage dividing circuit is connected with the direct current positive electrode busbar copper bar. Meanwhile, a coil working pin 13 of the direct current relay K3 is connected to one end of the voltage dividing circuit, and a coil working pin 14 of the direct current relay K3 is connected to the other end of the voltage dividing circuit.

The test button S1 is a test button with the voltage of the storage battery lower than 48V, and when the test button is pressed for a long time, two contacts of the S1 are closed. The other end of the test button S1 is connected with a direct current negative bus copper bar through a FUSE 2. In this embodiment, FUSE2 is a battery voltage low test sampling loop protection FUSE, gauge 125V6.3A.

If the test button S1 is pressed, the communication system can immediately generate an audible and visual alarm, and meanwhile, the monitor MCU2500 displays an alarm display that the voltage of the storage battery is lower than 48V, so that the low-voltage alarm circuit can be indicated to work normally. Otherwise, the alarm circuit is abnormal, and timely intervention, inspection and maintenance are needed. The specific working process of the utility model is as follows:

when the-48V switching power supply system U1 is in a normal floating state, the voltage of the lead-acid storage battery pack and the voltage of the direct current bus are connected together and are 54VDC, the positive electrode of the voltage is connected to the 1 pin (+) of the direct current voltmeter P1, and the negative electrode of the voltage is connected to the 2 pin (-) of the direct current voltmeter P1 through the 1 pin and the 9 pin of the direct current relay K3, so that the voltage of the 1 pin and the 2 pin of the direct current voltmeter P1 is 54VDC and is larger than the preset 48VDC, and the 3 pin and the 12 pin of the direct current voltmeter P1 are in a normal open state, and a monitor has no alarm display.

When the alternating current is in power failure, the lead-acid storage battery pack directly supplies power to the load, and as the power supply time is prolonged, the bus voltage of the lead-acid storage battery pack is gradually reduced, and the voltages input by 1 and 2 of the direct current voltmeter P1 are also gradually reduced. When the voltage is reduced to 48V, the 3 pins and the 12 pins of the direct-current voltmeter P1 are closed, the 1 pins and the 2 pins of the monitor MCU2500 are also closed, the audible and visual alarm of the screen is triggered, and the RS232 reports the alarm information that the voltage of the storage battery is lower than 48V, so that a user can stand on the monitoring acquisition system.

When the alarm test function is normal when the voltage of the storage battery is required to be tested and is lower than 48V, the test button S1 is required to be pressed manually, at the moment, the voltage of-54V is divided by the voltage dividing circuit, so that the voltage of the middle point of the voltage dividing circuit is lower than 44.6V, and the voltage is connected to the normally open contact (5 pins) of the direct current relay K3. When the test button S1 is pressed, the bus-pole is connected to the coil working pin 13 of the direct current relay K3 through the FUSE2 and the button contact of the test button S1, and the bus + pole is connected to the coil working pin 14 of the direct current relay K3, so that the coil working pins 13 and 14 of the direct current relay K3 have 54V voltage, the coil is electrically attracted, and the 1 pin and the 9 pin of the direct current relay K3 are controlled to be opened and the 5 pin and the 9 pin are controlled to be closed. The 44.6V voltage obtained by dividing the 5 pin of the direct current relay K3 is connected to the 2 pin of the direct current voltmeter P1 through the 5 pin and the 9 pin of the direct current relay K3. At this time, the voltages on pins 1 and 2 of the direct current voltmeter P1 are 44.6V, which is lower than the preset threshold value of 48V, pins 3 and 12 of the direct current voltmeter P1 are closed after 3S delay, pins 1 and 2 of the monitor MCU2500 are closed, the screen sends out an audible and visual alarm and RS232 sends out an alarm signal that the voltage of the storage battery is lower than 54V. Remarks: the alarm is generated by simulation, and background operation and maintenance personnel need to be informed in advance before testing.

Claims

1. The storage battery low-voltage warning pre-test circuit is characterized by comprising a direct-current voltmeter, wherein the digital output end of the direct-current voltmeter is connected with the digital input end of the direct-current 48V communication power supply, the power supply end of the direct-current voltmeter is connected with the direct-current positive busbar copper bar and the direct-current negative busbar copper bar, the positive electrode in the measurement input end of the direct-current voltmeter is connected with the direct-current positive busbar copper bar, and the negative electrode is connected with the common contact of the direct-current relay; the normally open contact of the direct current relay is connected with the circuit midpoint of the voltage dividing circuit, and the normally closed contact of the direct current relay is connected with the direct current negative busbar copper bar; the voltage dividing circuit is connected with a coil of the direct current relay in parallel, and after the coil is electrically attracted, the common contact of the direct current relay is conducted with the normally-open contact and disconnected with the normally-closed contact, otherwise, the common contact of the direct current relay is conducted with the normally-closed contact and disconnected with the normally-open contact; one end of the voltage dividing circuit is connected with the direct current negative electrode busbar copper bar through the test button and the first fuse in series connection, and the other end of the voltage dividing circuit is connected with the direct current positive electrode busbar copper bar.

2. A battery low voltage warning retry circuit for a-48V communication power supply as recited in claim 1, wherein said load is connected in series with a load switch.

3. A battery low voltage warning retry circuit for a-48V communication power supply as recited in claim 1, wherein said battery pack is connected in series with a battery pack protection fuse.

4. The accumulator low-voltage warning pre-test circuit for the-48V communication power supply according to claim 1, wherein the voltage dividing circuit is formed by connecting a first voltage dividing resistor and a second voltage dividing resistor in series.

5. The accumulator low-voltage warning pre-test circuit for a-48V communication power supply according to claim 1, wherein a negative electrode in a power supply end of the direct-current voltmeter is connected with the direct-current negative electrode busbar copper bar through a fuse II.