A multi-battery switching control circuit, device, system, and control method

Abstract

The embodiment of the application provides a multi-battery switching control circuit, device, system and control method, the switching control circuit comprises a first-stage circuit, a second-stage circuit and a third-stage circuit which are connected in parallel in sequence; the first-stage circuit comprises a first switch device and a second switch device; the second-stage circuit comprises an inductor and a fourth switch device; and the third-stage circuit comprises a third switch device and a battery unit. The switching control circuit realizes charging and discharging of the battery unit under different conditions through cooperation of the switch devices in the switching control circuit; meanwhile, the switching control circuit is connected in parallel with the first battery unit, the battery unit in the switching control circuit is adjusted, cooperation of the battery unit and the first battery unit is more stable and reliable, power demand and power safety of the communication equipment are improved, and the cost of modification is reduced in the parallel connection mode.

Description

Technical Field

[0001] The embodiments of the present invention relate to, but are not limited to, the field of power supply technology for communication equipment. Specifically, they relate to, but are not limited to, a multi-battery switching control circuit, device, system, and control method. Background Technology

[0002] In recent years, lithium batteries have developed rapidly in the field of communication power supplies. Older communication power supplies were mostly lead-acid batteries. To save costs and reuse existing lead-acid batteries, operators hoped to leverage the long cycle life of lithium batteries to achieve direct parallel use of lead-acid and lithium batteries, gradually replacing lead-acid batteries. However, due to limitations in the size of operators' existing server racks, they did not want to add additional battery switching units.

[0003] Lithium batteries and lead-acid batteries have different charge-discharge characteristics and cycle life. Due to these differences, various operating conditions often occur when lithium batteries and lead-acid batteries are used together.

[0004] In the early days, in order to meet the requirements of parallel use of lead-acid batteries and lithium batteries, communication power supplies mainly adopted hybrid battery switching units or simultaneous charging and discharging of lead-acid and lithium batteries.

[0005] Figure 1 The block diagram of the hybrid battery switching unit shows that the hybrid battery switching unit mainly realizes the switching state of lithium battery and lead-acid battery in the circuit by closing / opening S1 and S2.

[0006] It has several typical drawbacks:

[0007] (1) During charging, S2 can be closed first to enable lithium battery charging. S1 / S2 can be closed simultaneously to enable lithium battery / lead-acid battery charging. When S1 / S2 is closed and enters the busbar, the system controls the charging current of the lead-acid battery. The lithium battery charging can only follow the busbar voltage and cannot intelligently select the charging current, so it cannot achieve proportional charging of lithium battery / lead-acid according to the station capacity.

[0008] (2) During discharge, when S2 is closed and S1 is open in the system, lithium batteries can discharge preferentially. When S2 is open and S1 is closed, lead-acid batteries can discharge preferentially. However, due to the inconsistency between the lithium battery and lead-acid voltages at the end of the discharge, their charge-discharge curves are also inconsistent, making simultaneous discharge impossible.

[0009] If the voltages are inconsistent when S1 and S2 are open and closed, the lead-acid and lithium batteries will impact each other when closed. If S1 and S2 are switched in sequence, a station outage will occur.

[0010] Figure 2Another part of the patents involves direct parallel charging and discharging of lead-acid and lithium batteries. The charge / discharge coefficients, charging / discharging methods, and cycle life of lithium batteries are all different from those of lead-acid batteries. Direct parallel connection only provides power, not a direct parallel use of lithium batteries and lead-acid batteries. There is circulating current between lithium batteries and lead-acid batteries, which damages the lifespan of both types.

[0011] Therefore, a multi-battery switching control circuit, device, system, and control method are proposed, which is of great significance for controlling the input and output characteristics of newly added batteries to meet the power demand of communication equipment, improve the power supply stability and reliability of communication equipment, and reduce the modification cost. Summary of the Invention

[0012] The present invention provides a multi-battery switching control circuit, device, system, and control method, which mainly solves the technical problem that current communication equipment, in order to meet the increasing power demand, has performance differences between newly added battery packs and old battery packs, resulting in a significant reduction in the stability and reliability of the power supply's input and output characteristics.

[0013] To solve the above technical problems, embodiments of the present invention provide a switching control circuit, comprising: a first-stage circuit, a second-stage circuit, and a third-stage circuit connected in parallel in sequence;

[0014] The primary circuit includes a first switching device connected to the positive terminal of the busbar and a second switching device connected to the negative terminal of the busbar. The first and second switching devices are connected in sequence and are both positively positioned. The positive positioning is a setting method that enables the switching function when the potential of the positive terminal of the busbar is higher than the potential of the negative terminal of the busbar.

[0015] The secondary circuit includes an inductor led out from between the first and second switching devices, and a fourth switching device connected to the negative terminal of the busbar. The inductor and the fourth switching device are connected in sequence, and the fourth switching device is in the positive position.

[0016] The three-stage circuit includes a third switching device led out from between the inductor and the fourth switching device, and a battery cell connected to the same pole as the negative terminal of the busbar. The third switching device and the battery cell are connected in sequence and in reverse.

[0017] This invention also provides an integrated switching control circuit device, including at least one switching control circuit;

[0018] When the number of switching control circuits is greater than or equal to 2, the switching control circuits are connected in parallel with each other.

[0019] This invention also provides a multi-battery switching control circuit, comprising: a first battery unit and an integrated switching control circuit device including at least one battery unit;

[0020] The first battery cell is connected in parallel with the switching control circuit integrated device, and then connected to the positive and negative terminals of the busbar in a same polarity connection manner.

[0021] This invention also provides a multi-battery switching control system, including: a communication power supply, a multi-battery switching control circuit, and a load;

[0022] The busbar enters the multi-battery switching control system through the communication power supply. The communication power supply is used to control the input current and voltage of the busbar, control the charging and discharging of the multi-battery switching control circuit, and monitor the multi-battery switching control system.

[0023] The multi-battery switching control circuit is used to store electrical energy and to provide electrical energy to the load.

[0024] This invention also provides a multi-battery switching control method, comprising:

[0025] When the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply controls the power supply to the load and to charge the multi-battery switching control circuit.

[0026] When the AC power supply to the communication power supply fails and the busbar voltage drops, the communication power supply controls the multi-battery switching control circuit to supply power to the load.

[0027] According to an embodiment of the present invention, a multi-battery switching control circuit, device, system, and control method are provided. The switching control circuit is designed to include: a primary circuit, a secondary circuit, and a tertiary circuit connected in parallel. The primary circuit includes a first switching device connected to the positive terminal of the busbar and a second switching device connected to the negative terminal of the busbar. The first and second switching devices are connected in sequence and are both positively positioned. Positive positioning is a setting that enables switching when the positive terminal potential of the busbar is higher than the negative terminal potential. The secondary circuit includes an inductor led from between the first and second switching devices and a fourth switching device connected to the negative terminal of the busbar. The inductor and the fourth switching device are connected in sequence, and the fourth switching device is positively positioned. The tertiary circuit includes a third switching device led from between the inductor and the fourth switching device, and a battery cell connected to the same terminal as the negative terminal of the busbar. The third switching device and the battery cell are connected in reverse order. By coordinating the various switching devices in the switching control circuit, the charging and discharging of the battery unit under different conditions are achieved. At the same time, the switching control circuit is connected in parallel with the first battery unit. By adjusting the battery unit in the switching control circuit, the coordination between the battery unit and the first battery unit is made more stable and reliable, which improves the power consumption requirements and power safety of the communication equipment. Meanwhile, the direct parallel connection method reduces the cost of modification.

[0028] Other features and corresponding beneficial effects of the present invention will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in the specification. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of an existing hybrid battery switching unit structure;

[0030] Figure 2 This is a schematic diagram of an existing structure where lead-acid and lithium batteries are directly connected in parallel.

[0031] Figure 3 This is a schematic diagram of a switching control circuit according to Embodiment 1 of the present invention;

[0032] Figure 4 An equivalent circuit diagram of a buck charging circuit provided in Embodiment 1 of the present invention;

[0033] Figure 5 An equivalent circuit diagram of a boost charging circuit provided in Embodiment 1 of the present invention;

[0034] Figure 6 An equivalent circuit diagram of a buck power supply circuit provided in Embodiment 1 of the present invention;

[0035] Figure 7 An equivalent circuit diagram of a boost power supply circuit provided in Embodiment 1 of the present invention;

[0036] Figure 8 This is a schematic diagram of an extended structure of a switching control circuit provided in Embodiment 1 of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of a switching control circuit integrated device provided in Embodiment 2 of the present invention;

[0038] Figure 10 This is a schematic diagram of a multi-battery switching control circuit provided in Embodiment 3 of the present invention;

[0039] Figure 11 This is a schematic diagram of the structure of a multi-battery switching control circuit provided in Embodiment 3 of the present invention under different busbar polarities;

[0040] Figure 12 This is a schematic diagram of a multi-battery switching control system provided in Embodiment 4 of the present invention when powered by an external busbar;

[0041] Figure 13 This is a schematic diagram of a multi-battery switching control system provided in Embodiment 4 of the present invention when powered by battery.

[0042] Figure 14 This is a flowchart of a multi-battery switching control method provided in Embodiment 5 of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0044] With the increasing demand for electricity from current communication equipment, existing batteries are no longer sufficient to meet the power requirements. To address this, the batteries need to be upgraded, for example, by replacing them with larger capacity batteries. However, this method is costly and involves complex installation procedures. Another approach is to connect other batteries in parallel with the existing batteries to fill the power gap in the communication equipment. However, due to inconsistencies in the charge-discharge characteristics and cycle life of the existing and newly added batteries, the following situations may arise when using them together, including:

[0045] (1) When using mixed charging, the charging methods include three types: charging the newly added battery first, charging the newly added battery and the original battery at the same time, and charging the newly added battery and the original battery according to the station capacity.

[0046] (2) When discharging with mixed batteries, the discharge includes four states: priority discharge of newly added batteries, priority discharge of existing batteries, discharge of newly added batteries and existing batteries in proportion according to battery characteristics, and simultaneous discharge of newly added batteries and existing batteries at the end of the discharge.

[0047] (3) In 5G application scenarios, it is also necessary to require voltage boosting for power supply.

[0048] Example 1:

[0049] To meet the increased power supply demands of communication equipment, this embodiment provides a switching control circuit, which includes a first-stage circuit, a second-stage circuit, and a third-stage circuit connected in parallel. The first-stage circuit includes a first switching device connected to the positive terminal of the busbar and a second switching device connected to the negative terminal of the busbar. The first and second switching devices are connected in sequence and are both positively positioned. The positive positioning is a setting method that enables the switching function when the potential of the positive terminal of the busbar is higher than that of the negative terminal of the busbar. The second-stage circuit includes an inductor led out from between the first and second switching devices and a fourth switching device connected to the negative terminal of the busbar. The inductor and the fourth switching device are connected in sequence, and the fourth switching device is positively positioned. The third-stage circuit includes a third switching device led out from between the inductor and the fourth switching device, and a battery unit connected to the same terminal as the negative terminal of the busbar. The third switching device and the battery unit are connected in sequence and are reversed.

[0050] Please see Figure 3 , Figure 3 A switching control circuit is provided for this embodiment. In this switching control circuit, Vout+ is one end of the positive terminal of the busbar, Vout- is one end of the negative terminal of the busbar, VT1 is the first switching device, VT2 is the second switching device, VT1 is connected from the positive terminal of the busbar and then connected to VT2, VT2 is connected from the negative terminal of the busbar, VT1 and VT2 constitute a primary circuit; L is an inductor, VT4 is the fourth switching device, L is led out from between VT1 and VT2 in the primary circuit and then connected to VT4, VT4 is connected from the negative terminal of the busbar, L and VT4 constitute a secondary circuit; VT3 is the third switching device, and the rightmost part is the battery unit. In this embodiment, the battery unit includes, but is not limited to, a lithium battery. VT3 is led out from between L and VT4 in the secondary circuit and then connected to the positive terminal of the lithium battery, the negative terminal of the lithium battery is connected from the negative terminal of the busbar. Figure 3 As shown, in this embodiment, VT1, VT2, and VT4 are all positive, while VT3 is reversed. The positive setting indicates that the busbar positive terminal potential is higher than the busbar negative terminal potential, thus functioning as a switch.

[0051] In this embodiment, when the battery cell is charging; if the bus voltage is greater than the battery cell voltage, the third switch is turned on and the fourth switch is turned off. The first switch, the second switch, and the inductor form a buck charging circuit to charge the battery cell at a reduced voltage. If the bus voltage is less than the battery cell voltage, the first switch is turned on and the second switch is turned off. The third switch, the fourth switch, and the inductor form a boost charging circuit to charge the battery cell at a boost voltage.

[0052] There are two situations when it is necessary to charge the battery cells in the switching control circuit: (i) bus voltage Vout > lithium battery voltage VLi; (ii) bus voltage Vout < lithium battery voltage VLi.

[0053] When in condition (I), VT3 is on, VT4 is off, and VT1, VT2, and L form a buck charging circuit. In this case, the input voltage is stepped down to charge the lithium battery. The equivalent circuit diagram can be found in [reference needed]. Figure 4 .

[0054] When in condition (ii), VT1 is on, VT2 is off, and L, VT3, and VT4 form a boost charging circuit. In this case, the input voltage is boosted to charge the lithium battery. The equivalent circuit diagram can be found in [reference needed]. Figure 5 .

[0055] In this embodiment, when the battery cell supplies power; if the voltage of the battery cell is greater than the voltage of the first battery connected in parallel with the switching control circuit, the first switching device is turned on, the second switching device is not turned on, and the third switching device, the fourth switching device, and the inductor constitute a buck power supply circuit to supply power to the load at a reduced voltage; if the voltage of the battery cell is less than the voltage of the first battery connected in parallel with the switching control circuit, the third switching device is turned on, the fourth switching device is not turned on, and the first switching device, the second switching device, and the inductor constitute a boost power supply circuit to supply power to the load at a boost voltage.

[0056] There are two situations when the battery cell in the switching control circuit provides power: (i) the lithium battery voltage VLi > the external battery cell voltage V; (ii) the lithium battery voltage VLi < the external battery cell voltage V.

[0057] When in condition (I), VT1 is on, VT2 is off, and L, VT3, and VT4 form a buck power supply circuit. In this case, the lithium battery voltage is stepped down to provide power to the load. The equivalent circuit diagram can be found in [reference needed]. Figure 6 .

[0058] When in situation (ii), VT3 is on, VT4 is off, and VT1, VT2, and L form a boost power supply circuit. In this case, the lithium battery voltage is boosted to provide power to the load. The equivalent circuit diagram can be found in [reference needed]. Figure 7 .

[0059] In some embodiments, the first switching device of the primary circuit includes at least one; when the number of first switching devices is greater than or equal to 2, all first switching devices are positive and connected in parallel. A circuit diagram can be found here. Figure 8 .

[0060] In some embodiments, the inductor in the secondary circuit includes at least one; when the number of inductors is two, the two inductors are connected in series; when the number of inductors is greater than two, the remaining inductors are selected from the two inductors connected in series and connected in parallel. A circuit diagram can be found here. Figure 8 In this embodiment of the invention, the inductor is used for circuit combination to achieve boost and buck voltage. The inductor also includes rectification and filtering functions to protect the battery cells.

[0061] In some embodiments, to improve the scalability and maintainability of the switching control circuit, expansion interfaces are provided at different nodes of the switching control circuit to facilitate the access of external devices, as well as the replacement of the switching control circuit and its internal components. This embodiment provides examples of some expansion interface configurations, including: when the positive terminal of the busbar is connected to the primary circuit in the switching control circuit, it also includes a connection to a first expansion interface; and / or, when the switching control circuit is connected to the negative terminal of the busbar, it also includes a connection to a second expansion interface; and / or, at least one end of the tertiary circuit connected to the battery cell also includes a third expansion interface and / or a fourth expansion interface. The circuit diagram can be found in [reference needed]. Figure 8 . Figure 8 Expansion interfaces A and B are provided at the positive and negative terminals of the busbar (Vout), corresponding to the first and second expansion interfaces respectively. Expansion interfaces C and D are provided at both ends of the lithium battery, corresponding to the third and fourth expansion interfaces respectively. It should be noted that in this embodiment, the location and number of expansion interfaces are not limited and can be set at any location in the switching control circuit. The number of expansion interfaces can be one or more, or none at all. The interface type of the expansion interfaces is also not specifically limited and can be changed according to the interface function and the function of the expansion module to be connected.

[0062] In some embodiments, since the location and number of expansion interfaces in the switching control circuit of the expansion interface, as well as the interface function and port type, can be changed according to the circumstances, for ease of understanding and explanation, several specific devices that the expansion interface can be connected to are proposed here for reference. The devices include, but are not limited to, any one of fuses, relays, MOSFETs, switches, and additional function circuits.

[0063] In some embodiments, the first switching device, the second switching device, the third switching device, and the fourth switching device include any one of a semiconductor field-effect transistor (MOS) and an insulated gate bipolar transistor (IGBT).

[0064] This embodiment provides a switching control circuit, which includes a first-stage circuit, a second-stage circuit, and a third-stage circuit connected in parallel. The first-stage circuit includes a first switching device connected to the positive terminal of the busbar and a second switching device connected to the negative terminal of the busbar. The first and second switching devices are connected in sequence and are both positively positioned. The positive positioning is a setting method that enables the switching function when the potential of the positive terminal of the busbar is higher than that of the negative terminal of the busbar. The second-stage circuit includes an inductor led out from between the first and second switching devices and a fourth switching device connected to the negative terminal of the busbar. The inductor and the fourth switching device are connected in sequence, and the fourth switching device is positively positioned. The third-stage circuit includes a third switching device led out from between the inductor and the fourth switching device and a battery cell connected to the same terminal as the negative terminal of the busbar. The third switching device and the battery cell are connected in sequence and are reversed. This embodiment sets up a primary circuit, a secondary circuit, and a tertiary circuit. The combination of these three circuits constitutes a buck charging circuit and a boost charging circuit, as well as a buck power supply circuit and a boost power supply circuit. This realizes the buck and boost control of the battery cells. As a result, when the switching control circuit is connected in parallel with an external battery to form a battery pack, the matching between battery packs and the control of the battery pack become more stable and precise. This improves the safety and stability of the battery pack, as well as its service life.

[0065] Example 2:

[0066] This embodiment provides a switching control circuit integration device, which includes at least one switching control circuit; when the number of switching control circuits is greater than or equal to 2, the switching control circuits are connected in parallel with each other.

[0067] See also Figure 9 , Figure 9 This embodiment provides a switching control circuit integration device, which includes a plurality of switching control circuits W1, W2...Wn. These switching control circuits include, but are not limited to, the switching control circuits provided in this embodiment, from... Figure 9 As can be seen, the switching control circuits W of the integrated switching control circuit device are connected in parallel.

[0068] This embodiment provides a switching control circuit integrated device, which consists of at least one switching control circuit connected in parallel. By connecting the switching control circuits in parallel to form the switching control circuit integrated device, the switching control circuit can be expanded, achieving a more flexible combination relationship. The parallel connection of multiple switching control circuits can also increase the input and output current of the switching control circuit integrated device, thereby enabling the switching control circuit integrated device to operate in high current environments, improving the applicability of the switching control circuit integrated device, and reducing the cost of use.

[0069] Example 3:

[0070] This embodiment provides a multi-battery switching control circuit, which includes: a first battery unit and a switching control circuit integrated device containing at least one battery unit; the first battery unit and the switching control circuit integrated device are connected in parallel, and then connected to the positive and negative terminals of the busbar in a same polarity connection manner.

[0071] See also Figure 10 , Figure 10 This is a schematic diagram of a multi-battery switching control circuit provided in this embodiment. Figure 10 The multi-battery switching control circuit includes a first battery unit 100 and a switching control circuit integrated device 200.

[0072] When this embodiment is applied to current communication equipment, the first battery unit 100 usually refers to the original battery unit in the communication equipment, including but not limited to lead-acid batteries. These batteries are widely used in older communication equipment. However, with the rollout of 5G technology, the currently equipped lead-acid batteries are no longer able to meet the power requirements of the equipment. In this case, a higher-performance battery pack is connected in parallel with the original lead-acid batteries as a supplement to the original lead-acid batteries, which satisfies the power requirements of the communication equipment.

[0073] In this embodiment, the switching control circuit integrated device 200 includes, but is not limited to, the switching control circuit integrated device proposed in Embodiment 2. The switching control circuit integrated device in Embodiment 2 is composed of the switching control circuit in Embodiment 2. Therefore, the switching control circuit integrated device 200 includes at least one battery unit, which is connected in parallel with the first battery unit 100. At the same time, since the switching control circuit integrated device 200 can connect multiple switching control circuits in parallel, the input and output current can be adjusted. When applied to current communication equipment, it can gradually replace the relatively old lead-acid batteries and provide more convenient space for future equipment function expansion.

[0074] It should be noted that in this embodiment, the polarity of the first battery cell and the polarity of the switching control circuit integrated device are the same as the polarity of the busbar. That is, the positive terminal of the first battery cell is connected to the positive terminal of the busbar, and the positive terminal of the switching control circuit integrated device is also connected to the positive terminal of the busbar; the negative terminal of the first battery cell is connected to the negative terminal of the busbar, and the negative terminal of the switching control circuit integrated device is also connected to the negative terminal of the busbar. Furthermore, it should be noted that although the polarity of the first battery cell and the switching control circuit integrated device are the same as the polarity of the busbar in this embodiment, the battery cell's placement within the switching control circuit integrated device can be in two scenarios. In the first scenario, when the left side is the positive terminal of the busbar and the right side is the negative terminal, the positive current will first pass through the battery cell and then through other parts of the switching control circuit. In the second scenario, when the right side is the positive terminal of the busbar and the left side is the negative terminal, the positive current will first pass through other parts of the switching control circuit and then through the battery cell. See also... Figure 11 , Figure 11 This is a schematic diagram of the structure of a multi-battery switching control circuit provided in this embodiment under different busbar polarities. Figure 11 A corresponds to the first case. Figure 11 B corresponds to the second case.

[0075] In other embodiments, there are no restrictions on the type of the first battery cell in the multi-battery switching control circuit and the battery cell in the switching control circuit integrated device; the same type of battery cell or different types of battery cells can be used.

[0076] This embodiment provides a multi-battery switching control circuit, which consists of a first battery cell and a switching control circuit integrated device connected in parallel. In this embodiment, the first battery cell is typically a battery already installed in the device. By connecting a switching control circuit integrated device in parallel to the existing battery, the battery pack is expanded to achieve a larger output battery current. Simultaneously, since the switching control circuit integrated device consists of at least one switching control circuit connected in parallel, it can control the input and output current and voltage. This allows the parallel-connected switching control circuit integrated device to better cooperate with the original first battery cell, significantly improving the stability and reliability of the battery pack composed of the multi-battery switching control circuit.

[0077] Example 4:

[0078] This embodiment provides a multi-battery switching control system, which includes: a communication power supply, a multi-battery switching control circuit, and a load; a busbar enters the multi-battery switching control system through the communication power supply, which is used to control the output current and voltage of the busbar, control the charging and discharging of the multi-battery switching control circuit, and monitor the multi-battery switching control system; the multi-battery switching control circuit is used to store electrical energy and provide electrical energy to the load.

[0079] See also Figure 12 and Figure 13 In practical applications, the multi-battery switching control system of this embodiment includes two operating states, wherein... Figure 12 This is a schematic diagram of a multi-battery switching control system provided in this embodiment when powered by an external busbar. Figure 13 This is a schematic diagram of a multi-battery switching control system provided in this embodiment when powered by battery. Figure 12 and Figure 13 The circuit includes a first battery unit 100, a switching control circuit integrated device 200, a communication power supply 300, and a load 400. The arrow symbol represents the direction of current flow. The first battery unit 100 and the switching control circuit integrated device 200 form a multi-battery switching control circuit. There is a communication connection between the switching control circuit integrated device 200 and the communication power supply 300.

[0080] exist Figure 12 When the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply 300 will detect the current and voltage data and prioritize supplying the current to the load 400. At the same time, it will send the excess current to the first battery unit 100 and the switching control circuit integrated device 200 to charge the first battery unit 100 and the switching control circuit integrated device 200.

[0081] exist Figure 13 When the AC power supply to the communication power supply fails and the busbar experiences a voltage drop, the first battery unit 100 and the switching control circuit integrated device 200 begin to supply power to the load. At the same time, the communication power supply 300 controls the current and voltage values ​​of the control circuit integrated device 200, thereby controlling the power supply ratio of the first battery unit 100 and the switching control circuit integrated device 200.

[0082] This embodiment provides a multi-battery switching control system, including: a communication power supply, a multi-battery switching control circuit, and a load; the communication power supply is connected to the positive and negative terminals of a busbar and is used to control the power transfer from the busbar to the multi-battery switching control circuit and the load, and also to control the charging and discharging of the multi-battery switching control circuit; the multi-battery switching control circuit is used to store electrical energy and provide power to the load. The communication power supply detects the busbar voltage and current to determine the presence of alternating current, and simultaneously controls the charging and power supply of the multi-battery switching control circuit, thereby ensuring the normal power consumption of the load.

[0083] Example 5:

[0084] This embodiment provides a multi-battery switching control method, which includes: when the communication power supply is powered by AC and the busbar has a DC voltage output, the communication power supply controls the power supply to supply power to the load and to charge the multi-battery switching control circuit; when the communication power supply is powered by AC and the busbar has a voltage drop, the communication power supply controls the energy storage device to supply power to the load, and the energy storage device includes, but is not limited to, batteries.

[0085] The multi-battery switching control method in this embodiment mainly includes two scenarios. The first scenario is when the communication power supply AC is restored and the busbar has DC voltage output, the AC current from the busbar supplies power to the load and simultaneously proportionally charges the batteries in the multi-battery switching control circuit. The second scenario is when the communication power supply AC is deactivated and the busbar voltage drops; in this case, the batteries in the multi-battery switching control circuit are used to supply power to the load. For detailed steps, please refer to [link to relevant documentation]. Figure 14 , Figure 14 This is a flowchart of a multi-battery switching control method provided in this embodiment. The specific process includes:

[0086] S101, Communication power supply detection busbar current and voltage data.

[0087] S102. When the communication power supply is powered by AC and the busbar has a DC voltage output, the communication power supply controls the supply of power to the load and the charging of the multi-battery switching control circuit.

[0088] S103. When the AC power supply for communication fails and the busbar voltage drops, the communication power supply controls the multi-battery switching control circuit to supply power to the load.

[0089] In this embodiment of the invention, the communication power supply is the main control unit of the communication equipment. The functions of the communication power supply include, but are not limited to, monitoring and adjusting the current and voltage of the bus, controlling the multi-battery switching control circuit to charge and supply power according to circuit data and voltage data, and controlling the power supply current of the load.

[0090] In this embodiment, when the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply control supplies power to the load with the maximum supply current of the load, and the remaining current supplies the multi-battery switching control circuit for charging. The remaining current must not exceed the maximum current allowed by the multi-battery switching control circuit.

[0091] The communication power supply stores the maximum required current data of the load and the maximum allowable current data of the multi-battery switching control circuit. When the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply usually controls the current to supply power to the load first. In other embodiments, the current data through the busbar is then determined. When the current through the busbar cannot meet the power supply requirements of the load, the multi-battery switching control circuit can be controlled to supplement the load with electrical energy, so that the load can be in a normal working state. When the current through the busbar meets the power requirements of the load, power is supplied to the load, and the excess electrical energy is transferred to the multi-battery switching control circuit for charging.

[0092] In this embodiment, the multi-battery switching control circuit includes: a first battery unit connected in parallel and a switching control circuit integrated device containing at least one battery unit; when the multi-battery switching control circuit is charging, the communication power supply controls the first battery unit and / or the switching control circuit integrated device to charge according to a preset charging rule;

[0093] When the multi-battery switching control circuit is powered, the communication power supply controls the first battery unit and / or the switching control circuit integrated device to supply power to the load according to the preset power supply rules.

[0094] In this embodiment, the preset charging rules include: when the switching control circuit integrated device prioritizes charging, the bus voltage is controlled to be the same as the voltage of the first battery cell. At this time, if the bus voltage is greater than the voltage of the battery cell in the switching control circuit integrated device, the switching control circuit integrated device reduces the voltage to charge the battery cell; if the bus voltage is less than the voltage of the battery cell in the switching control circuit integrated device, the switching control circuit integrated device increases the voltage to charge the battery cell; when the first battery cell is charging, the switching control circuit integrated device charges the battery cell in the switching control circuit integrated device according to the bus voltage / battery cell voltage; when charging according to the current ratio I1:I2 is required, the switching control circuit integrated device is controlled to charge with I2, the remaining current is I1, and the first battery cell is charged.

[0095] In this embodiment, the preset power supply rules include: when the switching control circuit integrated device prioritizes power supply, the power supply voltage of the switching control circuit integrated device is the same as the voltage of the first battery unit. At this time, the first battery unit stops supplying power and charging. The power supply voltage of the switching control circuit integrated device includes boost power supply and buck power supply; when the first battery unit prioritizes power supply, the switching control circuit integrated device is turned off; when it is necessary to supply power according to the ratio of current I3:I4, the switching control circuit integrated device supplies power with I4, and the remaining current I3 is supplied by the first battery unit.

[0096] The aforementioned multi-battery switching control circuit includes, but is not limited to, the circuits and devices described in Embodiments 1 to 5. The first battery unit is typically the original storage battery unit of the communication device, while the multi-battery switching control circuit is an extended supplementary battery unit. Since the capacity of the supplementary battery unit is usually smaller than that of the original battery unit, but the performance and cycle life of the supplementary battery are significantly better than those of the original battery, in order to make better use of the batteries on the two lines, it is necessary to make appropriate adjustments and controls to the charging and power supply of the batteries.

[0097] This embodiment provides a multi-battery switching control method. It monitors and controls the charging and power supply of the multi-battery switching control circuit via a communication power supply. The method includes: when the communication power supply is AC and the busbar has DC voltage output, the communication power supply controls the supply of power to the load and charges the multi-battery switching control circuit; when the communication power supply is AC and the busbar voltage drops, the communication power supply controls the multi-battery switching control circuit to supply power to the load. By monitoring the busbar current and simultaneously supplying power to the load and charging the multi-battery switching control circuit, and controlling the multi-battery switching control circuit to supply power to the load when there is no current on the busbar, the method ensures that the load receives power under all circumstances, thereby guaranteeing the normal operation of the load.

[0098] In this embodiment, the multi-battery switching control circuit is composed of multiple battery units connected in parallel, including a first battery unit and a switching control circuit integrated device. By controlling the communication power supply, the matching and adjustment between the multiple batteries in the multi-battery switching control circuit are improved, thereby increasing battery efficiency, lifespan, and stability.

[0099] Example 6:

[0100] The following specific example illustrates the solution of the present invention. In this embodiment, the bidirectional DC / DC power conversion unit corresponds to the switching control circuit of the present invention, the lead-acid battery corresponds to the first battery unit, and the lithium battery corresponds to the battery unit. The preset initial conditions include: bus output current 300A, lead-acid battery configuration 600AH, lithium battery configuration 100AH, and maximum load current 90A.

[0101] 1. Lead-acid / lithium batteries should be charged according to the specified ratio:

[0102] Step 1: When an AC call comes in, the communication power supply powers the load and charges the battery. The total output current of the communication power supply is 300A, of which the maximum load current is 90A. The maximum charging current that can be provided to the battery is the output current minus the load current, with a maximum of 210A.

[0103] Step 2: The communication power supply directly charges the lead-acid battery at a maximum current of 120A (0.2C).

[0104] Step 3: The communication power supply monitoring calculates the maximum allowable current of the lithium battery as: 210A - 120A = 90A;

[0105] Step 4: The lithium battery obtains its maximum allowable charging current of 90A;

[0106] (1) If the bus voltage V out Lithium battery voltage V Li hour, Figure 3 VT3 is on, VT4 is off, and VT1 / VT2 / L form a BUCK circuit (see equivalent diagram). Figure 4 Therefore, the bidirectional DC / DC power conversion unit can use a buck circuit to charge the lithium battery. By controlling the switch of VT1 with PWM, the lithium battery can be charged at a reduced voltage and limited current of 90A.

[0107] (2) If the bus voltage V out Lithium battery voltage V Li of, Figure 3 VT1 is on, VT2 is off, and VT3 / VT4 form a BOOST circuit (see equivalent diagram). Figure 5 If the bidirectional DC / DC power conversion unit can use a boost converter to charge the lithium battery at 90A, then the bidirectional DC / DC power conversion unit can use a boost converter to charge the lithium battery at 90A.

[0108] Step 5: The communication power supply can be dynamically adjusted to charge the lead-acid / lithium battery ratio.

[0109] II. When discharging lead-acid / lithium batteries together, discharge them according to the ratio:

[0110] Step 1: When AC power fails, both lead-acid and lithium batteries instantly supply power to the load, with the lithium battery supplying power to the load at its maximum output.

[0111] Step 2: The total load current of the communication power supply is 90A.

[0112] Step 3: The communication power supply requires the lithium battery to discharge at 60A and the lead-acid battery at 30A. The communication power supply sends the required discharge current of the lithium battery to the lithium battery unit.

[0113] Step 4: The lithium battery receives the signal and discharges at a current of 60A.

[0114] (1) If V Li >V Pb Lithium batteries pass through Figure 6 The BUCK step-down discharge function provides a constant current output of 60A, with the remaining current required by the load being supplied by the lead-acid battery.

[0115] (2) If V Li <V Pb Lithium batteries pass through Figure 7 The BOOST boost discharge function provides a constant current output of 60A with adjustable voltage, and the remaining current required by the load is provided by the lead-acid battery.

[0116] Step 5: The communication power supply can be dynamically adjusted to discharge the lead-acid / lithium battery proportionally.

[0117] Therefore, those skilled in the art should understand that all or some of the steps, systems, and devices disclosed above, as well as the functional modules / units, can be implemented as software (which can be implemented using computer program code executable by a computing device), firmware, hardware, and suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as integrated circuits, such as application-specific integrated circuits (ASICs).

[0118] Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, computer program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium. Therefore, this invention is not limited to any particular combination of hardware and software.

[0119] The above description, in conjunction with specific implementation methods, provides a further detailed explanation of the embodiments of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A switching control circuit, characterized in that, The switching control circuit includes: a primary circuit, a secondary circuit, and a tertiary circuit connected in parallel in sequence; The primary circuit includes a first switching device connected to the positive terminal of the busbar and a second switching device connected to the negative terminal of the busbar. The first and second switching devices are connected in sequence and are both positively positioned. The positive positioning is a setting method that enables the switching function when the potential of the positive terminal of the busbar is higher than the potential of the negative terminal of the busbar. The secondary circuit includes an inductor led out from between the first and second switching devices, and a fourth switching device connected to the negative terminal of the busbar. The inductor and the fourth switching device are connected in sequence, and the fourth switching device is in the positive position. The three-stage circuit includes a third switching device led out from between the inductor and the fourth switching device, and a battery cell connected to the same pole as the negative terminal of the busbar. The third switching device and the battery cell are connected in sequence and in reverse.

2. The switching control circuit as described in claim 1, characterized in that, The first switching device of the primary circuit includes at least one; When the number of the first switching devices is greater than or equal to 2, all the first switching devices are upright and connected in parallel.

3. The switching control circuit as described in claim 1, characterized in that, The inductor of the secondary circuit includes at least one; When the number of inductors is 2, the two inductors are connected in series; When the number of inductors is greater than 2, the remaining inductors are selected from the two inductors connected in series and connected in parallel.

4. The switching control circuit as described in any one of claims 1-3, characterized in that, When the battery cell is charging; If the voltage of the busbar is greater than the voltage of the battery cell, the third switching device is turned on and the fourth switching device is not turned on. The first switching device, the second switching device and the inductor constitute a buck charging circuit to charge the battery cell by stepping down the voltage. If the voltage of the busbar is less than the voltage of the battery cell, the first switching device is turned on, the second switching device is not turned on, and the third switching device, the fourth switching device and the inductor constitute a boost charging circuit to charge the battery cell.

5. The switching control circuit as described in any one of claims 1-3, characterized in that, When the battery cell is powered; If the voltage of the battery cell is greater than the voltage of the first battery connected in parallel with the switching control circuit, the first switching device is turned on, the second switching device is not turned on, and the third switching device, the fourth switching device and the inductor constitute a buck power supply circuit to supply power to the load at a reduced voltage. If the voltage of the battery cell is less than the voltage of the first battery connected in parallel with the switching control circuit, the third switching device is turned on and the fourth switching device is not turned on. The first switching device, the second switching device, and the inductor constitute a boost power supply circuit to supply power to the load.

6. The switching control circuit as described in any one of claims 1-3, characterized in that, The first switching device, the second switching device, the third switching device, and the fourth switching device include any one of a semiconductor field-effect transistor (MOS) and an insulated gate bipolar transistor (IGBT).

7. The switching control circuit as described in any one of claims 1-3, characterized in that, In the switching control circuit, when the positive terminal of the busbar is connected to the primary circuit, it also includes a connection to the first expansion interface; And / or, When the switching control circuit is connected to the negative terminal of the busbar, it also includes a connection to the second expansion interface. And / or, At least one end of the three-level circuit connected to the battery cell further includes a third expansion interface and / or a fourth expansion interface.

8. The switching control circuit as described in claim 7, characterized in that, The expansion units that can be connected to the first expansion interface, the second expansion interface, the third expansion interface and the fourth expansion interface include any one of the following: fuse, relay, MOSFET, switch and additional function circuit.

9. A switching control circuit integrated device, characterized in that, The switching control circuit integration device includes at least one switching control circuit as described in any one of claims 1 to 8; When the number of switching control circuits is greater than or equal to 2, the switching control circuits are connected in parallel with each other.

10. A multi-battery switching control circuit, characterized in that, The multi-battery switching control circuit includes: a first battery unit and the switching control circuit integrated device as described in claim 9; The first battery unit is connected in parallel with the switching control circuit integrated device, and then connected to the positive and negative terminals of the busbar with the same polarity.

11. The multi-battery switching control circuit as described in claim 10, characterized in that, The battery cells in the first battery cell and the switching control circuit integrated device are either the same battery or different batteries.

12. A multi-battery switching control system, characterized in that, The multi-battery switching control system includes: a communication power supply, a multi-battery switching control circuit as described in claim 10 or 11, and a load; The busbar enters the multi-battery switching control system through the communication power supply. The communication power supply is used to control the input current and voltage of the busbar, control the charging and discharging of the multi-battery switching control circuit, and monitor the multi-battery switching control system. The multi-battery switching control circuit is used to store electrical energy and to provide electrical energy to the load.

13. A multi-battery switching control method, characterized in that, The multi-battery switching control method includes: When the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply controls the power supply to the load and to charge the multi-battery switching control circuit as described in claim 10 or 11. When the AC power supply to the communication power supply fails and the busbar voltage drops, the communication power supply controls the multi-battery switching control circuit to supply power to the load.

14. The multi-battery switching control method as described in claim 13, characterized in that, When the communication power supply receives AC power and the busbar outputs DC voltage, the communication power supply control supplies power to the load at the maximum supply current of the load, and the remaining current supplies the multi-battery switching control circuit for charging. The remaining current shall not exceed the maximum current allowed by the multi-battery switching control circuit.

15. The multi-battery switching control method as described in claim 14, characterized in that, The multi-battery switching control circuit includes: a first battery cell connected in parallel and a switching control circuit integrated device containing at least one battery cell; When the multi-battery switching control circuit is charging, the communication power supply controls the first battery unit and / or the switching control circuit integrated device to charge according to a preset charging rule; When the multi-battery switching control circuit is powered, the communication power supply controls the first battery unit and / or the switching control circuit integrated device to supply power to the load according to the preset power supply rules.

16. The multi-battery switching control method as described in claim 15, characterized in that, The preset charging rules include: When the switching control circuit integrated device prioritizes charging, it controls the bus voltage to be the same as the voltage of the first battery cell. At this time, if the bus voltage is greater than the voltage of the battery cell in the switching control circuit integrated device, the switching control circuit integrated device reduces the voltage to charge the battery cell; if the bus voltage is less than the voltage of the battery cell in the switching control circuit integrated device, the switching control circuit integrated device increases the voltage to charge the battery cell. When the first battery cell is charging, the switching control circuit integrated device charges the battery cell in the switching control circuit integrated device according to the bus voltage / battery cell voltage; When charging is required according to the current ratio I1:I2, the switching control circuit integrated device is controlled to charge at I2, with the remaining current being I1, and the first battery cell is charged.

17. The multi-battery switching control method as described in claim 15, characterized in that, The preset power supply rules include: When the switching control circuit integrated device prioritizes power supply, the power supply voltage of the switching control circuit integrated device is the same as the voltage of the first battery unit. At this time, the first battery unit stops supplying power and charging. The power supply voltage of the switching control circuit integrated device includes boost power supply and buck power supply. When the first battery cell provides priority power, the switching control circuit integrated device is turned off. When power needs to be supplied according to the ratio of current I3:I4, the switching control circuit integrated device is controlled to supply power with I4, and the remaining current I3 is supplied by the first battery cell.

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