CN103915861B - A kind of control method towards base station stand-by power supply, device, controller and system - Google Patents

Abstract

The embodiment of the present invention discloses a control method, device, controller and system for base station backup power supply. The method includes: receiving a mains power outage signal and using the power outage signal to sequentially trigger and issue a first disconnection instruction and a first power supply instruction, the first disconnection instruction indicates disconnection of the second power supply circuit, the first power supply instruction indicates that the first power supply circuit supplies power; analyze the obtained first battery information, and the first battery information includes the phosphoric acid The remaining capacity and voltage of the lithium iron battery pack and the voltage of a single lithium iron phosphate battery; when it is judged that the first battery information reaches the first switching condition, a second power supply command and a second disconnection command are issued, and the second power supply command Instructing the second power supply loop to supply power, the second disconnection instruction instructs to disconnect the first power supply loop and set the first power supply loop to a hot standby state.

Description

A control method, device, controller and system for base station backup power supply

technical field

The present invention relates to the technical field of communication power supply control, and more specifically, relates to a control method, device, controller and system for base station backup power supply.

Background technique

A base station refers to a radio transceiver station that transmits information between a mobile communication switching center and a mobile phone terminal in a certain radio coverage area. The normal operation of the base station depends on reliable power supply equipment.

Existing base stations generally install valve-regulated lead-acid batteries as a backup power supply, which can provide uninterrupted power supply for the base station when the AC mains power is cut off.

However, the existing valve-regulated lead-acid battery will have a problem of reduced service life under the condition of repeated deep discharge, thereby affecting the power supply reliability of the backup power supply of the base station.

Contents of the invention

In view of this, the present invention provides a control method, device, controller and system for base station backup power supply, so as to prevent the service life of the base station backup power supply from being shortened and improve the power supply reliability of the base station.

A control method for a base station backup power supply, which is used in a base station backup power supply system. The base station backup power supply system includes: a first power supply loop and a second power supply loop, the first power supply loop includes a lithium iron phosphate battery pack, and the The second power supply circuit includes a lead-acid battery pack;

The control methods include:

receiving a mains power outage signal and using the power outage signal to sequentially trigger a first disconnection instruction and a first power supply instruction, the first disconnection instruction instructs to disconnect the second power supply circuit, and the first power supply instruction instructs the first A power supply loop power supply;

Analyzing the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

When it is determined that the first battery information meets the first switching condition, a second power supply instruction and a second disconnection instruction are issued, the second power supply instruction indicates that the second power supply circuit supplies power, and the second disconnection instruction indicates Disconnecting the first power supply circuit and setting the first power supply circuit to a hot standby state.

Optionally, the method also includes:

Obtain the voltage of the lead-acid battery pack in the second power supply circuit, which is recorded as the first voltage;

When it is determined that the first voltage is lower than the preset voltage, a third power supply instruction is issued, and the third power supply instruction instructs the first power supply loop to supply power in parallel with the second power supply loop through a diode;

It is determined that the first voltage is lower than the lower voltage limit, and a power supply stop instruction is issued, and the fourth power supply instruction instructs the first power supply loop and the second power supply loop to stop power supply.

Optionally, the method also includes:

Under the normal state of mains power, the charging equipment controlling the backup power supply system of the base station performs intermittent floating charging for the lithium iron phosphate battery circuit, and performs full floating charging for the second power supply circuit.

Optionally, the method also includes:

Obtaining a mains incoming call signal and triggering a first charging instruction with the incoming call signal, the first charging instruction instructs the charging equipment of the base station backup power supply system to charge the lead-acid battery pack;

Analyzing the obtained second battery information, the second battery information includes the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lithium iron phosphate battery;

When it is determined that the second battery information meets the second switching condition, a second charging instruction is issued, and the second charging instruction instructs the charging device to charge the lithium iron phosphate battery pack at the same time.

A control device for a base station backup power supply, used to implement a control method for a base station backup power supply, comprising:

Power outage signal receiving module, used to receive mains power outage signal;

The first power failure control module is configured to receive the trigger of the mains power failure signal, and instruct to disconnect the second power supply circuit;

The first power supply control module is configured to receive the trigger of the mains power outage signal, and instruct the first power supply loop to supply power;

The first analysis module is used to analyze the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

The second power supply control module is configured to instruct the second power supply loop to supply power when judging that the first battery information meets the first switching condition;

The second power-off control module is configured to instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state when judging that the first battery information reaches the first switching condition

A controller for base station backup power supply, used to implement the control method for base station backup power supply according to claim 1, comprising:

A processor and a memory, the processor reads and executes instructions in the memory, the instructions include:

Power outage signal receiving instruction, used to receive mains power outage signal;

The first power cut control instruction is used to receive the trigger of the mains power cut signal and instruct to disconnect the second power supply circuit;

The first power supply control command is used to receive the trigger of the mains power outage signal and instruct the first power supply loop to supply power;

The first analysis module is used to analyze the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

The second power supply control module is configured to instruct the second power supply loop to supply power when judging that the first battery information meets the first switching condition;

The second power-off control module is used to judge that when the first battery information reaches the first switching condition, instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state, a kind of base station-oriented The control system for the backup power supply includes: the controller for the backup power supply of the base station.

Optionally:

The first power supply circuit includes a diode and a DC contactor installed in parallel.

It can be seen from the above technical solutions that the embodiment of the present invention adds a power supply circuit for lithium iron phosphate batteries on the basis of the power supply circuit for lead-acid batteries of the original base station. When the capacity is preset, it acts as a hot backup power supply and assists the lead-acid battery as a cold backup power supply to supply power, thereby reducing the deep discharge of the lead-acid battery, prolonging the service life of the base station backup power supply, and improving the power supply reliability of the base station.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a flow chart of a control method for base station backup power disclosed by an embodiment of the present invention;

Fig. 2 is a flow chart of a control method for base station backup power disclosed in another embodiment of the present invention;

Fig. 3 is a flow chart of a control method for base station backup power disclosed in another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a control device for base station backup power disclosed by an embodiment of the present invention;

Fig. 5a is a schematic structural diagram of a control device for base station backup power disclosed in another embodiment of the present invention;

Fig. 5b is a schematic structural diagram of a control device for base station backup power disclosed in another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a controller for base station backup power disclosed by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a control system for base station backup power disclosed by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of another control system for base station backup power disclosed by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Due to its stable performance and high cost performance, lead-acid batteries have become the most commonly used backup power supply in communication base stations at present. They are charged and discharged by full float charging, and theoretically can achieve a service life of about 10 years. However, the service life of base stations with frequent power outages is less than half of the theoretical service life due to repeated deep discharge of lead-acid batteries.

In order to prevent the shortening of the service life of the lead-acid battery, the inventor, after research, discloses a control method, device, controller and system for the backup power supply of the base station, so as to prevent the shortening of the service life of the backup power supply of the base station and improve the power supply of the base station The technical effect of reliability.

Figure 1 shows a control method for base station backup power supply, the method is used in the base station backup power supply system, the base station backup power supply system includes: a first power supply loop and a second power supply loop, the first power supply loop includes phosphoric acid An iron-lithium battery pack, the second power supply circuit includes a lead-acid battery pack;

The control methods include:

S11: receiving a mains power outage signal and sequentially triggering a first disconnection command and a first power supply command based on the power outage signal;

The first disconnection instruction instructs to disconnect the second power supply circuit, and the first power supply instruction instructs the first power supply circuit to supply power;

In the actual base station backup power system, the power supply circuit of the lithium iron phosphate battery pack can instantly supply power to the load through the diode after the contactor is closed. At this time, the DC contactor can be disconnected in the lead-acid battery power supply circuit, as Cold standby power supply, there are diodes to provide uninterrupted power supply path during the short transition time of first off and then on.

S12: Parsing the obtained first battery information;

The first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

In the backup power supply system of the base station, a monitoring device or module for monitoring the terminal voltage of the lithium iron phosphate storage battery is provided. Since there is a corresponding relationship between the terminal voltage and the capacity of the storage battery, the battery information of the lithium iron phosphate storage battery can be obtained, and the remaining Capacity can be interpreted as AH capacity (Ah, the unit to measure the capacity of electrical storage equipment, that is, the integral of current and time, 1AH means that the electrical storage equipment can continue to work for 1 hour when the power supply current intensity is 1A); the remaining capacity is also It can be interpreted as the voltage of the lithium iron phosphate storage battery or the voltage of a single lithium iron phosphate storage battery. Based on the remaining capacity, the two battery pack circuits are adjusted for power supply switching.

S13: When it is determined that the first battery information meets the first switching condition, send a second power supply instruction and a second disconnection instruction;

The second power supply instruction instructs the second power supply loop to supply power, and the second disconnection instruction instructs to disconnect the first power supply loop and set the first power supply loop to a hot standby state.

The switching conditions can be set differently in different application scenarios, for example, when the lithium iron phosphate battery discharges 80% of its capacity, or the voltage of the lithium iron phosphate battery pack is lower than 45V, or a single acid The voltage of the lithium iron battery is lower than 2.8V, etc., when the battery information reaches the first switching condition, the DC contactor in the first circuit is disconnected, and the lithium iron phosphate battery pack is used as a backup power supply. When the lead-acid battery power supply circuit is deeply discharged and the lead-acid battery pack is discharged to a certain extent, it will cooperate with the lead-acid battery power supply circuit to supply power.

The above implementation method is based on the existing lead-acid battery power supply circuit, setting up a lithium iron phosphate battery power supply circuit, and when the mains power fails, the power supply circuit of the lithium iron phosphate battery is given priority to supply power, so that when the lead-acid battery is not needed In the case of a short-term power failure when the power supply circuit of the acid battery is started, the number of discharges of the lead-acid battery is saved, and the problem of life reduction caused by working at high ambient temperature is overcome; when the power supply circuit of the lithium iron phosphate battery is discharged to a certain extent, the lead-acid battery is restarted Acid battery power supply circuit. The lithium iron phosphate battery power supply circuit is used as a hot standby to wait for the lead-acid battery pack to discharge to a certain extent, and then cooperate with the lead-acid battery power supply circuit to provide power to reduce the power supply load of the lead-acid battery pack and slow down deep discharge. Therefore, the service life of the backup power supply of the base station is prevented from being shortened, and the power supply reliability of the base station is improved.

Figure 2 shows yet another control method for base station backup power supply, including:

S21: Receive a mains power outage signal and sequentially trigger and issue a first disconnection command and a first power supply command based on the power outage signal;

The first disconnection instruction instructs to disconnect the second power supply circuit, and the first power supply instruction instructs the first power supply circuit to supply power;

S22: Parsing the obtained first battery information;

The first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

S23: When it is determined that the first battery information meets the first switching condition, send a second power supply instruction and a second disconnection instruction;

The second power supply instruction instructs the second power supply loop to supply power, and the second disconnection instruction instructs to disconnect the first power supply loop and set the first power supply loop to a hot standby state.

S24: Obtain the voltage of the lead-acid storage battery in the second power supply circuit, which is recorded as the first voltage;

S25: Determine whether the first voltage is lower than the preset voltage, if yes, execute S26; otherwise, return to S24;

S26: When the voltage of the lead-acid battery pack in the second power supply circuit is lower than 0.5-0.7 volts of the lithium iron phosphate battery pack in the first power supply circuit, in order to prevent the power supply load of the lead-acid battery pack from being too high, make the The lithium iron phosphate battery pack is put into power supply at the same time.

In this embodiment, the structural arrangement of the lithium iron phosphate battery power supply circuit and the lead-acid battery power supply circuit in the backup power supply system of the base station can realize parallel power supply.

S27: Judging whether the first voltage reaches the voltage lower limit, if yes, execute S28; otherwise, return to S26;

S28: Issue a power supply stop instruction.

The fourth power supply instruction instructs the first power supply loop and the second power supply loop to stop supplying power.

Discharging will stop when both battery packs reach their power limit.

Fig. 3 shows another kind of control method oriented to the backup power supply of the base station. In this embodiment, what is embodied is the control process of the mains power supply after a power failure, including:

S31: Obtain the incoming call signal of the mains and trigger the sending of a first charging instruction with the incoming call signal, and the first charging instruction instructs the charging equipment of the backup power supply system of the base station to charge the lead-acid battery pack;

When the mains power comes in, the mains power supply first charges the lead-acid battery pack through the charging device, and the lead-acid battery pack is actually used as a cold standby power supply.

S32: Parsing the obtained second battery information, the second battery information includes the current capacity and voltage of the lead-acid battery pack and the voltage of a single lithium iron phosphate battery;

S33: When it is determined that the second battery information meets the second switching condition, issue a second charging instruction, where the second charging instruction instructs the charging device to charge the lithium iron phosphate battery pack at the same time.

For example, when the capacity of the lead-acid battery pack reaches 70%, the DC contactor of the lithium iron phosphate battery circuit is closed, and the lithium iron phosphate battery pack starts charging. When the lithium iron phosphate storage battery group reaches the exit condition, the device 71 is disconnected, the diode continues to flow and the device 72 is connected, and the lead-acid storage battery group enters an equal charge state. When the lead-acid storage battery group When the terminal voltage reaches a certain preset voltage, it indicates that the lead-acid battery pack exits the equal charge state and is in the float charge state. The lithium iron phosphate battery pack is in the intermittent charging state at the same time.

What needs to be added is: the charging condition of the intermittent charging state is that the voltage of the lithium iron phosphate battery pack is lower than 49.50-49.95V or the voltage of a single lithium iron phosphate battery is 3.30-3.33V, and the exit charging condition is that the lithium iron phosphate battery pack is charged The current is lower than 0.005-0.01C or the voltage of a single lithium iron phosphate battery reaches 3.55-3.65V.

Figure 4 shows a control device for base station backup power supply, including:

Power outage signal receiving module 41, used for receiving mains power outage signal;

The first power outage control module 42 is configured to receive the trigger of the mains power outage signal, and instruct to disconnect the second power supply circuit;

The first power supply control module 43 is configured to receive the trigger of the mains power outage signal, and instruct the first power supply loop to supply power;

The first parsing module 44 is configured to parse the obtained first battery information, the first battery information includes the remaining capacity, voltage and voltage of a single lithium iron phosphate battery pack of the lithium iron phosphate battery;

The second power supply control module 45 is configured to instruct the second power supply loop to supply power when judging that the first battery information meets the first switching condition;

The second power-off control module 46 is configured to instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state when it is determined that the first battery information meets the first switching condition.

The above-mentioned device is a functional module corresponding to each step of the method shown in FIG. 1 and the embodiment, and the device defined by such a functional module is a functional module framework for realizing the technical solution of the present invention.

Figure 5a shows a control device for base station backup power supply, based on the illustration in Figure 4, it also includes:

A voltage acquisition module 51, configured to acquire the voltage of the lead-acid battery pack in the second power supply circuit, denoted as the first voltage;

The third power supply control module 52 is configured to instruct the first power supply loop to supply power in parallel with the second power supply loop through a diode when it is determined that the first voltage is lower than a preset voltage;

The power supply stop control module 53 is configured to instruct the first power supply loop and the second power supply loop to stop supplying power when it is determined that the first voltage is lower than the lower voltage limit.

as well as:

Figure 5b shows a control device for base station backup power supply, based on the illustrations in Figure 4-Figure 5a, it also includes:

Incoming call signal receiving module 54, used to obtain the mains incoming call signal;

The first charging control module 55 is used to accept the trigger of the incoming call signal of the commercial power, and instruct the charging equipment of the base station backup power supply system to charge the lead-acid battery pack;

The second parsing module 56 is used for parsing the obtained second battery information, the second battery information including the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lithium iron phosphate battery;

The second charging control module 57 is configured to instruct the charging device to charge the lithium iron phosphate battery pack at the same time when it is determined that the second battery information meets the second switching condition.

Float charge control module 58 is used to control the charging equipment of the backup power supply system of the base station to carry out intermittent float charge for the lithium iron phosphate storage battery circuit under the normal state of the mains power supply, and to carry out full float charge for the second power supply circuit ( Except when the lithium iron phosphate battery circuit is intermittently charged).

Figure 6 shows a controller for base station backup power supply, including:

Processor 61 and memory 62, the processor 61 reads and executes instructions in the memory 62, the instructions include:

Power outage signal receiving instruction, used to receive mains power outage signal;

The first power cut control instruction is used to receive the trigger of the mains power cut signal and instruct to disconnect the second power supply circuit;

The first power supply control command is used to receive the trigger of the mains power outage signal and instruct the first power supply loop to supply power;

The first power-off control instruction module is executed prior to the first power supply control instruction module, and a diode provides an uninterrupted power supply path during the short transition time of first-off and then-on.

The first analysis module is used to analyze the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery;

The second power supply control module is configured to instruct the second power supply loop to supply power when judging that the first battery information meets the first switching condition;

The second power-off control module is configured to instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state when it is determined that the first battery information meets the first switching condition.

As an optional implementation manner, the instructions further include:

The voltage acquisition instruction is used to acquire the voltage of the lead-acid battery pack in the second power supply circuit, which is recorded as the first voltage;

The third power supply control instruction is used to instruct the first power supply loop to supply power in parallel with the second power supply loop through a diode when it is determined that the first voltage is lower than a preset voltage;

The power supply stop control instruction is used to instruct the first power supply loop and the second power supply loop to stop supplying power when it is determined that the first voltage is lower than a lower voltage limit.

The float charge control command is used to control the charging equipment of the backup power supply system of the base station to perform intermittent float charge for the lithium iron phosphate battery pack circuit and to perform full float charge for the second power supply circuit under the normal state of mains power.

Incoming call signal receiving instruction, used to obtain the mains incoming call signal;

The first charging control instruction is used to accept the trigger of the incoming call signal of the mains, and instruct the charging equipment of the backup power system of the base station to charge the lead-acid battery pack;

The second analysis instruction is used to analyze the obtained second battery information, the second battery information includes the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lithium iron phosphate battery;

The second charging control instruction is used to instruct the charging device to charge the lithium iron phosphate battery pack at the same time when it is determined that the second battery information meets the second switching condition.

The processor 61 reads and executes the instructions in the memory 62. The model of the processor and the type of the memory are not limited. The instructions can be implemented in the form of software modules, and the software modules can be placed in random Memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form known in the art in the storage medium.

In order to understand the present invention more clearly, Fig. 7 and Fig. 8 show the control system oriented to the base station backup power supply in two embodiments, and Fig. 7 is a structure of a control system oriented to the base station backup power supply disclosed in an embodiment of the present invention schematic diagram. This solution is to upgrade the existing switching power supply monitoring module, use the RS485 or RS232 communication interface to receive the information uploaded by the two groups of battery detection modules, and control the two relays to send switching to the first DC contactor and the second DC contactor respectively. signal to realize the complementary advantages of the two sets of batteries. As shown in Figure 7, the control system for the backup power supply of the base station includes an iron-lithium battery pack, an iron-lithium battery detection module, a lead-acid battery pack, a lead-acid battery detection module, a control device, four DC contactors (including the first direct current contactor) DC contactor 71, second DC contactor 72, third DC contactor 73 and fourth DC contactor 74), diode D and four shunts, the DC contactor includes control coils C1, C2, C3 and C4.

Among them, the iron-lithium battery pack is connected to the iron-lithium battery detection module, the lead-acid battery pack is connected to the lead-acid battery detection module, the iron-lithium battery detection module and the lead-acid battery detection module are respectively connected to the control equipment, and the control equipment is respectively connected to four DC The contactor control coil is connected, the iron-lithium battery pack is connected with the first DC contactor, the lead-acid battery pack is connected with the second DC contactor, the third DC contactor and the fourth DC contactor are respectively connected with general loads and important loads The two sets of positive poles of the battery pack and the two sets of load positive poles are directly connected to the positive busbar, and the negative poles of the two sets of battery packs and the two sets of load negative poles are respectively connected to the busbar through corresponding DC contactors, fuses (or air switches), and shunts. connection, the diode is connected in parallel with the first DC contactor.

The control equipment further includes a switching power supply monitoring module. The switching power supply monitoring module is respectively connected to the acquisition interface and the control relay. The acquisition interface is respectively connected to the iron-lithium battery detection module and the lead-acid battery detection module. The control relay is respectively connected to four DC contactors. .

The four DC contactors are respectively connected to the negative bus bar through a shunt, and a fuse or an air switch is also arranged between the shunt and the DC contactor.

Fig. 8 is a schematic structural diagram of another control device for base station backup power disclosed by an embodiment of the present invention. This solution is a complementary solution between an independent iron-lithium battery pack and the existing DC power supply system voltage-controlled switching, with its own intelligent automatic switching function, and is suitable for all switching power supply DC power supply systems in use. As shown in Figure 8, the control device for the backup power supply of the base station includes an iron-lithium battery pack, an iron-lithium battery detection module, a lead-acid battery pack, a lead-acid battery detection module, a control device, four DC contactors (including the first direct current contactor) DC contactor 71, second DC contactor 72, third DC contactor 73 and fourth DC contactor 74), DC contactor includes its control coils C1, C2, C3, C4, diode D and four shunts.

Among them, the iron-lithium battery pack is connected to the iron-lithium battery detection module, the lead-acid battery pack is connected to the lead-acid battery detection module, the iron-lithium battery detection module and the lead-acid battery detection module are respectively connected to the control equipment, and the control equipment is respectively connected to four DC The contactor control coil is connected, the iron-lithium battery pack is connected to the first DC contactor, the lead-acid battery pack is connected to the second DC contactor, the third DC contactor and the fourth DC contactor are respectively connected to general loads and important loads .

The control device further includes a battery pack switching controller 70 and a switching power supply monitoring module. The input ends of the battery pack switching controller are respectively connected to the iron-lithium battery detection module and the lead-acid battery detection module, and the output ends are respectively connected to the first DC contactor control coil. It is connected with the second DC contactor control coil, and the switching power supply monitoring module is respectively connected with the third DC contactor control coil and the fourth DC contactor control coil.

The battery pack switching controller further includes a CPU, a control relay and an acquisition interface. The control relay and the acquisition interface are respectively connected to the CPU, the acquisition interface is respectively connected to the iron-lithium battery detection module and the lead-acid battery detection module, and the control relay is respectively connected to the first DC The contactor control coil is connected to the second DC contactor control coil.

The four DC contactors are respectively connected to the busbar through a shunt, and a fuse or an air switch is provided between the shunt and the DC contactor.

The difference between the above two embodiments is that the solution shown in Figure 1 is controlled by a controller (switching power supply monitoring module) to control C1, C2, C3, C4, while the solution shown in Figure 2 is realized by two sets of controllers Control of C1, C2, C3, C4. Both work as described below:

When the mains power is normal, the second DC contactor 72 is closed, and the lead-acid battery pack is float-charged online; the first DC contactor 71 of the iron-lithium battery pack circuit is disconnected, and the isolation diode is turned off under reverse pressure, and is in a hot standby state. When the iron-lithium battery is lower than the predetermined value (as an embodiment, such as 49.5V) set by the controller due to self-discharge, the second DC contactor 72 is disconnected first, and then the first DC contactor 71 is closed , the switching power supply supplements the charging of the iron-lithium battery pack with the floating charging voltage. When the charging current is lower than the set value (for example, 0.005-0.01C (or only higher than 3.65V), the first DC contactor 71 is disconnected first. Afterwards, the second DC contactor 72 is closed again, and when the lead-acid storage battery is floating-charged online, the diode D is subjected to a reverse voltage to play an isolation role, and the iron-lithium battery is in a hot standby state.

When the mains power fails, the second DC contactor 72 is disconnected, and the lead-acid battery pack is offline; the iron-lithium battery pack realizes uninterrupted power supply through the isolation diode, and then the first DC contactor 71 is closed, the diode is bypassed, and the iron-lithium battery pack The group directly discharges the load through the first DC contactor 71 .

When the iron-lithium battery pack discharges 80% of the rated capacity or the total voltage is lower than the set value (as an example, such as 45V) or the single voltage is lower than the set value (such as 2.5-2.8V), the first DC contactor 71 Disconnected under the control of the controller, the iron-lithium battery pack realizes uninterrupted discharge through the diode D, and then the second DC contactor 72 closes the lead-acid battery pack, and the load is discharged because the voltage of the lead-acid battery pack is higher than the voltage of the iron-lithium battery pack. The diode is automatically turned off due to back pressure, and the iron-lithium battery pack is in a hot standby state.

When the discharge voltage of the lead-acid battery pack drops to the set value (such as 44.5V) when the switching power supply is turned off once, the third DC contactor 73 is disconnected, and the general load is disconnected. The lead-acid battery pack continues to discharge important loads. When the voltage continues to drop to a voltage difference with the iron-lithium battery pack that is greater than the conduction value of the diode D, the iron-lithium battery pack is connected in parallel with the lead-acid battery pack to supply power through the diode D. When the discharge voltage When lower than the battery protection voltage value (such as 43.2V), the fourth DC contactor 74 is disconnected, the important load is disconnected, the second DC contactor 72 is also disconnected, and the lead-acid battery pack is disconnected, and it will be recharged when waiting for the commercial power.

When the mains power comes in, the second DC contactor 72 is closed, and the switching power supply first charges the lead-acid battery through the second DC contactor 72. When the voltage of the switching power supply gradually rises higher than the set recovery voltage, the third DC contactor The switch 73 and the fourth DC contactor 74 are closed, the load resumes power-on work, and the lead-acid battery is charged to a preset value (such as when the rated capacity is 80% or the charging current is lower than the set value, the switching power supply monitoring module controls the relay (or battery Group switching controller) sends a control signal to disconnect the second DC contactor 72, and the lead-acid battery pack is offline; then the first DC contactor 71 is closed under the control of the switching power supply monitoring module control relay (or battery pack switching controller), The switching power supply charges the iron-lithium battery pack through the first DC contactor 71. After it is fully charged, the first DC contactor 71 is controlled to disconnect, and the iron-lithium battery pack returns to the hot standby state, and the switching power supply monitoring module controls the relay (or Storage battery pack switching controller) sends control signal again and closes the second DC contactor 72, and the lead-acid storage battery pack returns to the online equalization charge, and turns to the float charge state automatically when it is fully full.

If the iron-lithium battery pack is not placed in 80% of the mains, the switching power supply will automatically charge the iron-lithium battery, the first DC contactor 71 will be disconnected first, the iron-lithium battery pack will be in hot standby, and the second DC contactor 72 will be closed again. , Lead-acid battery online floating charge.

If the mains does not have power for a long time, the switching power supply will regularly charge the lead-acid battery pack; when the iron-lithium battery detection module detects that the iron-lithium battery cell is lower than the set value (such as the voltage of the single cell is lower than 3.33V or the voltage of the whole group When it is lower than 49.5V), first disconnect 72, and then close 71 to recharge the iron-lithium battery pack. When the charged voltage is greater than the preset value (such as the voltage of a single unit is 3.6 volts, the voltage of the whole group is 54 volts) or the charging current is less than When the preset value (such as 0.005-0.01C), first disconnect 71, automatically stop charging, restore the standby state of the iron-lithium battery pack, and then close 72, the lead-acid battery pack continues online floating charge.

The iron-lithium battery pack can be preferably composed of 15 single cells in series, and the lead-acid battery pack can be preferably composed of 24 single cells connected in series. Each single battery can be equipped with a voltage and internal resistance detection circuit and an automatic equalization circuit.

The specific form of setting and function realization of the system is not limited.

In summary, the embodiment of the present invention adds a power supply circuit for the iron-lithium battery pack on the basis of the lead-acid battery power supply circuit of the original base station. The control method realizes that the iron-lithium battery pack is discharged preferentially when the power is cut off, and when the discharge is lower than the preset Capacity (or voltage), as a hot backup power supply, when the discharge voltage value of the lead-acid battery is lower than the voltage of the iron-lithium battery pack, it will continue to participate in the discharge, thereby reducing the deep discharge of the lead-acid battery, extending the service life of the base station backup power supply, and improving The power supply reliability of the base station is improved.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present invention . Therefore, the embodiments of the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A control method for a base station backup power supply, characterized in that it is used in a base station backup power supply system, the base station backup power supply system comprising: a first power supply loop and a second power supply loop, and the first power supply loop includes iron phosphate A lithium battery pack, the second power supply circuit includes a lead-acid battery pack; The control methods include: receiving a mains power outage signal and using the power outage signal to sequentially trigger a first disconnection instruction and a first power supply instruction, the first disconnection instruction instructs to disconnect the second power supply circuit, and the first power supply instruction instructs the first A power supply loop power supply; Analyzing the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery; When it is determined that the first battery information meets the first switching condition, a second power supply instruction and a second disconnection instruction are issued, the second power supply instruction indicates that the second power supply circuit supplies power, and the second disconnection instruction indicates disconnecting the first power supply circuit and setting the first power supply circuit to a hot standby state; Under the normal state of mains power, control the charging equipment of the backup power supply system of the base station to perform intermittent charging for the lithium iron phosphate battery pack, and perform full float charging for the second power supply circuit; The method also includes: Obtaining a mains incoming call signal and triggering a first charging instruction with the incoming call signal, the first charging instruction instructs the charging equipment of the base station backup power supply system to charge the lead-acid battery pack; Analyzing the obtained second battery information, the second battery information includes the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lead-acid battery; When it is determined that the second battery information meets the second switching condition, a second charging instruction is issued, and the second charging instruction instructs the charging device to charge the lithium iron phosphate battery pack. 2. the control method facing base station standby power supply as claimed in claim 1, is characterized in that, also comprises: Obtain the voltage of the lead-acid battery pack in the second power supply circuit, which is recorded as the first voltage; When it is determined that the first voltage is lower than the preset voltage, a third power supply instruction is issued, and the third power supply instruction instructs the first power supply loop to supply power in parallel with the second power supply loop through a diode; It is determined that the first voltage is lower than the lower voltage limit, and a power supply stop instruction is issued, and the power supply stop instruction instructs the first power supply loop and the second power supply loop to stop supplying power. 3. A control device for base station backup power supply, characterized in that, for realizing the control method for base station backup power supply according to claim 1, comprising: Power outage signal receiving module, used to receive mains power outage signal; The first power failure control module is configured to receive the trigger of the mains power failure signal, and instruct to disconnect the second power supply circuit; The first power supply control module is configured to receive the trigger of the mains power outage signal, and instruct the first power supply loop to supply power; The first analysis module is used to analyze the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery; The second power supply control module is configured to instruct the second power supply loop to supply power when judging that the first battery information meets the first switching condition; The second power-off control module is configured to instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state when judging that the first battery information reaches the first switching condition; The device also includes: The float charge control module is used to control the charging equipment of the backup power supply system of the base station to intermittently charge the lithium iron phosphate battery pack and to perform full float charge for the second power supply circuit under the normal state of the mains power supply; The incoming call signal receiving module is used to obtain the mains incoming call signal; The first charging control module is used to accept the trigger of the incoming signal of the commercial power, and instruct the charging equipment of the backup power system of the base station to charge the lead-acid battery pack; The second analysis module is used to analyze the obtained second battery information, the second battery information includes the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lead-acid battery; The second charging control module is configured to instruct the charging device to charge the lithium iron phosphate battery pack when it is determined that the second battery information meets the second switching condition. 4. the control device facing base station backup power supply as claimed in claim 3, is characterized in that, also comprises: A voltage acquisition module, configured to acquire the voltage of the lead-acid battery pack in the second power supply circuit, denoted as the first voltage; A third power supply control module, configured to instruct the first power supply loop to supply power in parallel with the second power supply loop through a diode when it is determined that the first voltage is lower than a preset voltage; The power supply stop control module is configured to instruct the first power supply loop and the second power supply loop to stop supplying power when it is determined that the first voltage is lower than a lower voltage limit. 5. A controller for base station backup power supply, characterized in that, for realizing the control method for base station backup power supply according to claim 1, comprising: A processor and a memory, the processor reads and executes instructions in the memory, the instructions include: Power outage signal receiving instruction, used to receive mains power outage signal; The first power cut control instruction is used to receive the trigger of the mains power cut signal and instruct to disconnect the second power supply circuit; The first power supply control command is used to receive the trigger of the mains power outage signal and instruct the first power supply loop to supply power; The first analysis module is used to analyze the obtained first battery information, the first battery information includes the remaining capacity and voltage of the lithium iron phosphate battery pack and the voltage of a single lithium iron phosphate battery; The second power-off control instruction is used to instruct to disconnect the first power supply loop and set the first power supply loop to a hot standby state when it is judged that the first battery information meets the first switching condition; The instructions also include: The floating charge control command is used to control the charging equipment of the backup power system of the base station to intermittently charge the lithium iron phosphate battery pack under the normal state of the mains power, and the circuit of the lead-acid battery pack is intermittently disconnected, and the second power supply at other times The circuit is fully float charged; Incoming call signal receiving instruction, used to obtain the mains incoming call signal; The first charging control command is used to accept the trigger of the incoming call signal of the mains, and instruct the charging equipment of the backup power supply system of the base station to charge the lead-acid battery pack; The second parsing instruction is used to parse the obtained second battery information, the second battery information includes the existing capacity and voltage of the lead-acid battery pack and the voltage of a single lead-acid battery; The second charging control instruction is used to instruct the charging device to charge the lithium iron phosphate battery pack at the same time when it is determined that the second battery information meets the second switching condition. 6. The controller facing base station backup power supply as claimed in claim 5, wherein the instructions also include: The voltage acquisition instruction is used to acquire the voltage of the lead-acid battery pack in the second power supply circuit, which is recorded as the first voltage; The third power supply control instruction is used to instruct the first power supply loop to supply power in parallel with the second power supply loop through a diode when it is determined that the first voltage is lower than a preset voltage; The power supply stop control instruction is used to stop the power supply of the first power supply loop and the second power supply loop when it is determined that the first voltage is lower than the lower voltage limit. 7. A control system for base station backup power supply, characterized by comprising: the controller for base station backup power supply according to any one of claims 5-6. 8. The control system for base station backup power supply according to claim 7, wherein the first power supply circuit comprises a diode and a DC contactor installed in parallel.