Control circuit and control method for battery combined connection

Abstract

The present application discloses a control circuit and control method for battery combined connection. The control circuit comprises at least two unit control circuits; a signal output end of each unit control circuit is connected to a signal input end of at least one inverter; a voltage input end of each inverter is connected to at least one group of batteries; and a voltage output end of each inverter is connected to an output interface. According to the control circuit, when the inverters realize series discharging or series charging, a control chip sends a control instruction to each unit control circuit, so that the unit control circuits respectively control the inverters to perform alternating current output or charging input; and when the inverters realize parallel discharging or parallel charging, the control chip sends a control instruction to one of the unit control circuits, so that the unit control circuit receiving the control instruction controls the plurality of inverters to synchronously perform alternating current output or perform synchronous charging, thereby implementing flexible combined output and charging control of a plurality of groups of rechargeable batteries based on usage requirements.

Description

Control circuit and control method for battery combination connection

[0001] This application is based on and claims priority to the Chinese patent application with application number 202310731754.3 and application date June 16, 2023. The entire contents of the application are hereby introduced as a whole into this application. Technical Field

[0002] The present application relates to the technical field of control circuits, and in particular to a control circuit and a control method for battery combination connection. Background Art

[0003] As mobile devices increase their power demands, rechargeable batteries can be converted into AC power and discharged to provide power for these devices. However, existing methods often impose fixed output voltages and power levels on each battery pack, preventing flexible control of the output of multiple battery packs based on user needs. This limits the flexibility of rechargeable batteries in practical applications. Consequently, existing control circuits for rechargeable batteries suffer from an inability to flexibly control the output of these batteries. Application Contents

[0004] The embodiments of the present application provide a control circuit and a control method for battery combination connection, which aim to solve the problem that the control circuit for rechargeable batteries in the prior art cannot flexibly control the output of the rechargeable batteries.

[0005] In a first aspect, an embodiment of the present application discloses a control circuit for connecting a battery pack, the control circuit comprising at least two unit control circuits, wherein the signal output terminal of each unit control circuit is connected to the signal input terminal of at least one inverter, and the voltage input terminal of each inverter is connected to at least one group of batteries, thereby achieving battery capacity expansion; the voltage output terminal of each inverter is connected to an output interface;

[0006] The unit control circuit includes a first control chip, a second control chip and a signal output circuit;

[0007] The second pin of the first control chip serves as a first signal input terminal, and the third pin serves as a second signal input terminal; the first signal input terminal and the second signal input terminal are both connected to the control chip; the seventh pin of the first control chip is connected to the fourth pin of the second control chip, and the sixth pin of the first control chip is connected to the first pin of the second control chip;

[0008] The sixth pin of the second control chip is connected to the first input terminal of the signal output circuit, and the seventh pin of the second control chip is connected to the second input terminal of the signal output circuit; the first signal output terminal and the second signal output terminal of the signal output circuit jointly serve as the signal output terminal of the unit control circuit;

[0009] The grounding wires of the voltage output terminals of the inverters are connected to each other;

[0010] When the inverter realizes series discharge or series charging, the phase line of the voltage output end of one inverter is connected to the first phase line output end and the third phase line output end of the output interface, the neutral line of the voltage output end of the inverter is connected to the neutral line of the voltage output end of another inverter, and the connection point is simultaneously connected to the second phase line output end and the sixth phase line output end of the output interface; the phase line of the voltage output end of another inverter is connected to the fourth phase line output end and the fifth phase line output end of the output interface; the signal input end of each inverter is respectively connected to the signal output end of a corresponding unit control circuit through the communication interface, thereby realizing series boosted power expansion discharge and boosted power expansion charging;

[0011] When the inverter realizes parallel discharge or parallel charging, the phase lines of the voltage output ends of the inverter are connected to each other and to the phase line output end of the output interface; the neutral lines of the voltage output ends of the inverter are connected to each other and to the neutral line output end of the output interface, and the ground lines of the voltage output ends of the inverter are connected to each other; the signal input end of each inverter is simultaneously connected to the signal output end of one of the unit control circuits through the communication interface, thereby realizing parallel expanded power discharge and expanded power charging.

[0012] In a second aspect, an embodiment of the present application further discloses a control method for connecting a battery pack, wherein the control method is applied to the control circuit for connecting a battery pack as described in the first aspect, and the method includes:

[0013] The control chip receives the input control instruction;

[0014] If the control instruction is series discharge, the control chip sends a first control instruction and a second control instruction to the two unit control circuits respectively, so that the two unit control circuits independently control the phase of the AC power output by the phase lines of the voltage output terminals of the two inverters;

[0015] If the control instruction is parallel discharge, one of the unit control circuits is determined to be the target unit control circuit, and the control chip sends a parallel control instruction to the target unit control circuit so that the target unit control circuit simultaneously controls the phase of the AC power output by the phase line of the voltage output end of two or more inverters.

[0016] The embodiment of the present application discloses a control circuit and control method for battery combination connection, the control circuit includes at least two unit control circuits, the signal output end of each unit control circuit is connected to the signal input end of at least one inverter, the voltage input end of each inverter is connected to at least one group of batteries, and the voltage output end of each inverter is connected to an output interface. In the above-mentioned control circuit, if the inverter realizes series discharge or series charging, a control instruction is sent to each unit control circuit through the control chip, and the unit control circuit controls the AC output or charging input respectively, thereby increasing the AC output voltage or performing series charging; if the inverter realizes parallel discharge or parallel charging, a control instruction is sent to one of the unit control circuits through the control chip, so that the unit control circuit receiving the control instruction controls multiple inverters to synchronously output AC power or synchronously charge, thereby increasing the AC output power or performing parallel charging, and can realize flexible combined output and charging control of multiple groups of rechargeable batteries according to usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] FIG1 is an overall circuit structure diagram of a control circuit provided in an embodiment of the present application;

[0019] FIG2 is a circuit structure diagram of a unit control circuit provided in an embodiment of the present application;

[0020] FIG3 is a circuit structure diagram of a connection socket provided in an embodiment of the present application;

[0021] FIG4 is a circuit connection structure diagram between inverters in series according to an embodiment of the present application;

[0022] FIG5 is a circuit connection structure diagram of inverters in parallel according to an embodiment of the present application;

[0023] FIG6 is a flow chart of a control method for battery combination connection provided in an embodiment of the present application.

[0024] Reference numerals: UN, unit control circuit; INV, inverter; BAT, battery; IC2, first control chip; U15, second control chip; S1, signal output circuit; CN5, connector; L5, fifth inductor; L9, ninth inductor; L3, third inductor; L7, seventh inductor; TVS2, first bidirectional voltage regulator; TVS2, second bidirectional voltage regulator; TVS4, third bidirectional voltage regulator; R2, second resistor; C5, fifth capacitor; C6, sixth capacitor; S_5V+, standard voltage terminal; S_3V3 , regulated power supply terminal; GND_A, ground terminal; C8, eighth capacitor; R1, first resistor; R3, third resistor; CANL_S1, first signal output terminal; CANL_S2, second signal output terminal; P, output interface; P_1, first phase line output terminal; P_2, second phase line output terminal; P_3, third phase line output terminal; P_4, fourth phase line output terminal; P_5, fifth phase line output terminal; P_6, sixth phase line output terminal; P_T, communication interface; P_L, phase line output terminal; P_N, neutral line output terminal. Implementation Method

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0027] It should also be understood that the terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0029] The embodiment of the present application discloses a control circuit for connecting a battery combination, as shown in Figures 1 to 3, the control circuit includes at least two unit control circuits UN, the signal output end of each unit control circuit UN is connected to the signal input end of an inverter INV, the voltage input end of each inverter INV is connected to at least one group of batteries BAT, and the voltage output end of each inverter INV is connected to an output interface P; the unit control circuit UN includes a first control chip IC2, a second control chip U15 and a signal output circuit S1; the second pin of the first control chip IC2 serves as a first signal input end, and the third pin serves as a second signal input end; the first signal input end and the second signal input end are connected to the first signal input end and the second signal input end. Both signal input ends are connected to the control chip; the seventh pin of the first control chip IC2 is connected to the fourth pin of the second control chip U15, and the sixth pin of the first control chip IC2 is connected to the first pin of the second control chip U15; the sixth pin of the second control chip U15 is connected to the first input end of the signal output circuit S1, and the seventh pin of the second control chip U15 is connected to the second input end of the signal output circuit S1; the first signal output end CANL_S1 and the second signal output end CANL_S2 of the signal output circuit S1 jointly serve as the signal output end of the unit control circuit UN; the ground lines of the voltage output ends of the inverter INV are connected to each other.

[0030] The control chip can send different control instructions to each unit control circuit UN, and the unit control circuit UN receives the control instructions from the control chip through the first signal input terminal and the second signal input terminal respectively. The control chip can also send control instructions to one of the unit control circuits UN. The signal output terminal of the signal output circuit S1 is used to output a corresponding control signal to the inverter INV to control the phase of the AC power output by the inverter INV. The voltage input terminal of the inverter INV is connected to at least one set of batteries BAT. The inverter INV can obtain electrical energy from one or more sets of batteries BAT and invert the DC power output by each set of batteries BAT into AC power for output, wherein each set of batteries BAT can be composed of multiple battery subassemblies.

[0031] In addition, in a specific embodiment of the present application, a unit control circuit, an inverter directly connected to the unit control circuit, and a battery pack connected to an inverter connected to the unit control circuit constitute an inverter output master, and other inverters connected to the unit control circuit and battery packs connected to other inverters constitute inverter output slaves. For one unit control circuit, there is only one inverter output master, and the number of inverter output slaves is the total number of inverters connected to the unit control circuit minus one, that is, the number of inverter output slaves can be zero, one, or multiple. The specific embodiments of the present application focus on the combination connection between two or more inverter output masters, and the number of inverter output slaves does not affect the combination connection between the inverter output masters.

[0032] The voltage input end of each inverter INV is connected to at least one battery group BAT, thereby realizing battery expansion. Expansion means increasing the number of battery groups to increase the overall storage capacity of the battery.

[0033] In the first connection mode, when the inverter INV realizes series discharge or series charging, the phase line of the voltage output end of one inverter INV is connected to the first phase line output end P_1 and the third phase line output end P_3 of the output interface P, the neutral line of the voltage output end of the inverter INV is connected to the neutral line of the voltage output end of another inverter INV, and the connection point is simultaneously connected to the second phase line output end P_2 and the sixth phase line output end P_6 of the output interface P; the voltage output end of the other inverter INV is connected to the neutral line of the voltage output end of the inverter INV. The phase lines at the output terminals are connected to the fourth phase line output terminal P_4 and the fifth phase line output terminal P_5 of the output interface P. The signal input terminals of each inverter INV are connected to the signal output terminals of a corresponding unit control circuit UN via the communication interface P_T. The specific circuit connection structure is shown in FIG4 . The phase line, neutral line, and ground line of the first inverter INV are represented by L1, N1, and G1, respectively, while the phase line, neutral line, and ground line of the second inverter INV are represented by L2, N2, and G2, respectively. At this time, the control chip issues a first control instruction and a second control instruction to the two unit control circuits UN, respectively, so that the two unit control circuits UN independently control the phase of the AC power output by the phase lines of the voltage output terminals of the two inverters INV.

[0034] For example, when the maximum value of the phase line voltage at the voltage output end of the inverter INV is 120V, the AC power outputted by the phase line of the inverter INV is in the form of a sine wave, and 120V AC power output is achieved between the first phase line output end P_1 and the second phase line output end P_2, and 120V AC power output is also achieved between the fifth phase line output end P_5 and the sixth phase line output end P_6; the AC power voltages of the phase line outputs of the voltage output ends of the two inverters INV are in opposite phases, and therefore, 240V AC power output is achieved between the third phase line output end P_3 and the fourth phase line output end P_4, thereby achieving the effect of improving the use of the output voltage.

[0035] The mains connection terminal of each inverter can be connected to the mains power, which is usually 220V AC. The input AC power is inverted by each inverter to form DC power, which can charge the battery pack electrically connected to the inverter.

[0036] For example, two unit control circuits UN are connected to two inverters INV respectively, and each inverter is connected to 6 battery packs. The input power of INV connected to the mains is 3.6kW and the voltage is 90-120V. The output power of each battery pack is 1.2kW and the voltage is 90-120V. When series discharge is performed, the maximum value of the phase line voltage at the voltage output end of the inverter INV is 120V, that is, the output voltage corresponding to a single unit control circuit UN is 90-120V, and the output power is 3.6+1.2×6=10.8 kW, the two unit control circuits UN are combined in series, and the AC power output by the phase line of the inverter INV is in the form of a sine wave, then a 120V AC power output is achieved between the first phase line output terminal P_1 and the second phase line output terminal P_2, and a 120V AC power output is also achieved between the fifth phase line output terminal P_5 and the sixth phase line output terminal P_6; the AC power voltages of the phase line outputs of the voltage output terminals of the two inverters INV are in opposite phases, therefore, a 240V AC power output is achieved between the third phase line output terminal P_3 and the fourth phase line output terminal P_4, and the output power in the 240V output mode is 3.6×2=7.2kW, and the output power in the 120V output mode is 10.8kW, thereby realizing series boosting and power expansion discharge, wherein boosting means increasing the output voltage, and power expansion means increasing the input and output power. When charging, the output voltage of a single unit control circuit UN is 90-120V, and the output power is 3.6kW; when two unit control circuits UN are connected in series, the output voltage is 120V and the output power is 3.6kW, thus achieving boosted and expanded power charging.

[0037] In the second connection mode, when the inverter INV realizes parallel discharge or parallel charging, the phase lines of the voltage output ends of the inverter INV are connected to each other and to the phase line output end P_L of the output interface P; the neutral lines of the voltage output ends of the inverter INV are connected to each other and to the neutral line output end P_N of the output interface P, and the ground lines of the voltage output ends of the inverter INV are connected to each other; the signal input end of each inverter INV is simultaneously connected to the signal output end of one of the unit control circuits UN through the communication interface P_T. The specific circuit connection structure is shown in Figure 5. The phase line, neutral line, and ground line of the first inverter INV are represented by L1, N1, and G1, respectively, and the phase line, neutral line, and ground line of the second inverter INV are represented by L2, N2, and G2, respectively. At this point, the control chip first determines that one of the unit control circuits UN is the target unit control circuit UN. The control chip then issues a parallel control instruction to the target unit control circuit UN, causing the target unit control circuit UN to simultaneously control the phase of the AC power output by the phase lines of the voltage output terminals of two or more inverters INV. For example, when the maximum phase line voltage at the voltage output terminal of the inverter INV is 120V, a 120V AC power output is achieved between the phase line output terminal P_L and the neutral line output terminal P_N. At this time, the output power is the sum of the output powers of the multiple inverters INV, thereby achieving the effect of increasing the output power.

[0038] The mains connection terminal of each inverter can be connected to the mains power, which is usually 220V AC. The input AC power is inverted by each inverter to form DC power, which can charge the battery pack electrically connected to the inverter.

[0039] For example, assume two unit control circuits UN are connected to two inverters INV, each connected to six battery packs. The mains input power from INV is 3.6 kW and the voltage is 90-264 V. Each battery pack outputs 1.2 kW and the voltage is 90-264 V. During parallel discharge, the output voltage of a single unit control circuit UN is 90-264 V, and the output power is 3.6 + 1.2 × 6 = 10.8 kW. The combined output voltage of the two unit control circuits UN is the same as that of a single unit control circuit UN, and the combined output power is 21.6 kW, thus achieving parallel power expansion discharge, increasing the output power from 10.8 kW to 21.6 kW. When charging the battery pack, the output voltage of a single unit control circuit UN is 90-264 V, and the output power is 3.6 kW. When charging, the output voltage of a single unit control circuit UN is 90-264V, and the output power is 3.6kW; when two unit control circuits UN are connected in series, the output voltage is 90-264V, and the output power is 7.2kW, thus realizing expanded power charging and doubling the output power.

[0040] In a more specific embodiment, when the inverter INV realizes series discharge, the phases of the AC power output by the phase lines of the voltage output ends of the two inverters INV are opposite; when the inverter INV realizes parallel discharge, the phases of the AC power output by the phase lines of the voltage output ends of two or more inverters INV are the same.

[0041] In specific applications, to improve performance, when the inverters INV are discharged in series, a control chip can output control instructions to the inverters INV so that the phases of the AC power output by the two inverters INV phase lines are opposite. In this scenario, due to the AC phase variations, the two inverters INV are typically connected in parallel; or two groups of inverters INV are connected in parallel, with multiple inverters INV in each group connected in series. When the inverters INV are discharged in parallel, the control chip can control the phases of the AC power output by the phase lines of the multiple inverters INV to be the same. In this scenario, multiple inverters INV are typically connected in series. The number of inverters INV used can be cumulative based on demand, or the number of inverters INV used can be odd. When charging the battery packs, the charging voltage can be shared by connecting them in series, enabling series charging of multiple battery packs connected to each inverter. The charging power can be shared by connecting them in parallel, enabling synchronous charging of multiple battery packs connected to each inverter.

[0042] In a more specific embodiment, the signal output circuit S1 includes a fifth inductor L5, a ninth inductor L9, a third inductor L3 and a seventh inductor L7; one end of the fifth inductor L5 serves as the first input end of the signal output circuit S1 and is connected to the sixth pin of the second control chip U15; one end of the ninth inductor L9 serves as the second input end of the signal output circuit S1 and is connected to the fifth pin of the second control chip U15; the other end of the fifth inductor L5 is connected to one end of the third inductor L3, and the other end of the ninth inductor L9 is connected to one end of the seventh inductor L7; the other end of the third inductor L3 serves as the first signal output end CANL_S1 of the signal output circuit S1; the other end of the seventh inductor L7 serves as the second signal output end CANL_S2 of the signal output circuit S1. The fifth inductor L5, ninth inductor L9, third inductor L3, and seventh inductor L7 provided in the signal output circuit S1 can filter the control signal passing through these inductors, thereby improving the command of the output control signal and, in turn, improving the accuracy of the control of the inverter INV by the unit control circuit UN. Specifically, the signal output circuit S1 also includes a first bidirectional voltage regulator diode TVS2 and a second bidirectional voltage regulator diode TVS2; one end of the first bidirectional voltage regulator diode TVS2 is connected to the connection point between the fifth inductor L5 and the third inductor L3, and the other end is connected to the ground terminal GND_A; one end of the second bidirectional voltage regulator diode TVS2 is connected to the connection point between the ninth inductor L9 and the seventh inductor L7, and the other end is connected to the ground terminal GND_A. To further improve the output effect of the control signal, a first bidirectional voltage regulator diode TVS2 and a second bidirectional voltage regulator diode TVS2 can also be provided. The first bidirectional voltage regulator diode TVS2 and the second bidirectional voltage regulator diode TVS2 can stabilize the electrical signal in the signal output circuit S1. The signal output circuit S1 further includes a third bidirectional voltage regulator diode TVS4; its two ends are connected to the first signal output terminal CANL_S1 and the second signal output terminal CANL_S2, respectively. Furthermore, the signal output circuit S1 further includes a second resistor R2; one end of the second resistor R2 is connected to the connection point between the fifth inductor and the third inductor L3, and the other end is connected to the connection point between the ninth inductor L9 and the seventh inductor L7. To further enhance the voltage stabilization effect of the electrical signal, a third bidirectional voltage regulator diode TVS4 and a second resistor R2 may also be provided in the signal output circuit S1.

[0043] In a more specific embodiment, the first pin of the first control chip IC2 is connected to one end of a fifth capacitor C5, the other end of which is connected to the fourth pin of the first control chip IC2 and grounded. The eighth pin of the first control chip IC2 is connected to the regulated power supply terminal S_3V3 and one end of a sixth capacitor C6, the other end of which is connected to the eighth pin of the first control chip IC2 and grounded. This design of the first control chip IC2 improves the stability of control signal transmission and processing, thereby improving the quality of the control signal output from the first control chip IC2 to the second control chip U15.

[0044] Specifically, the third pin of the second control chip U15 is connected to one end of the eighth capacitor C8 and the standard voltage terminal S_5V+; the other end of the eighth capacitor C8 is connected to the ground terminal GND_A; the second pin of the second control chip U15 is connected to the ground terminal GND_A; the fifth pin of the second control chip U15 is connected to one end of the first resistor R1, the other end of which is connected to the regulated power supply terminal S_3V3; and the eighth pin of the second control chip U15 is connected to one end of the third resistor R3, the other end of which is connected to the ground terminal GND_A. The above-mentioned design of the second control chip U15 can improve the stability of the transmission and processing of control signals, thereby improving the quality of the control signals output by the second control chip U15 to the signal output circuit S1.

[0045] As shown in Figure 3 , the signal output of the unit control circuit UN is connected to the signal input of a corresponding inverter INV via a connector CN5. A first signal output terminal CANL_S1 of the unit control circuit UN's signal output is connected to a first pin of the connector CN5, and a second signal output terminal CANL_S2 of the unit control circuit UN's signal output is connected to a second pin of the connector CN5. The ground terminal GND_A is connected to a third pin of the connector CN5, and the regulated power supply terminal S_3V3 is connected to a fourth pin of the connector CN5. To improve the reliability of the connection between the signal output of the unit control circuit UN and the inverter INV, the signal output of the unit control circuit UN can also be connected to the signal output of the inverter INV via the connector CN5.

[0046] The present application also discloses a control method for a battery BAT combination connection. The control method is applied to the control circuit for the battery BAT combination connection in the above embodiment. As shown in FIG6 , the control method includes steps S110 to S130.

[0047] S110: The control chip receives an input control instruction.

[0048] The control chip can receive a control instruction input by a user, and the control instruction can be parallel discharge or series discharge.

[0049] S120. If the control instruction is series discharge, the control chip sends a first control instruction and a second control instruction to the two unit control circuits respectively, so that the two unit control circuits independently control the phase of the AC power output by the phase lines of the voltage output terminals of the two inverters.

[0050] If the control instruction is series discharge or series charge, the control chip sends two sets of control instructions to the unit control circuit UN respectively, and the unit control circuit UN controls the phase of the AC power output by the phase lines of the two inverters INV separately according to the control instructions.

[0051] S130: If the control instruction is for parallel discharge, one of the unit control circuits is determined to be the target unit control circuit, and the control chip issues a parallel control instruction to the target unit control circuit, causing the target unit control circuit to simultaneously control the phase of the AC power output by the phase lines of the voltage output terminals of two or more inverters. When charging the battery pack, the charging voltage can be shared in series, thereby enabling series charging of multiple battery packs connected to each inverter.

[0052] If the control instruction is for parallel discharge or parallel charging, the control chip determines that a unit control circuit UN is the target unit control circuit UN and issues a parallel control instruction to the target unit control circuit UN. The target unit control circuit UN automatically adjusts the phase of the AC power output by the phase lines of the multiple inverters INV to achieve synchronous AC power output from the multiple inverters INV. When charging the battery pack, the charging power can be shared in parallel, thereby achieving synchronous charging of multiple battery packs connected to each inverter.

[0053] The present application discloses a control circuit and control method for battery combination connection, the control circuit comprising at least two unit control circuits, the signal output end of each unit control circuit being connected to the signal input end of at least one inverter, the voltage input end of each inverter being connected to at least one group of batteries, and the voltage output end of each inverter being connected to an output interface. In the above-mentioned control circuit, if the inverter implements series discharge or series charging, a control instruction is sent to each unit control circuit via a control chip, and the unit control circuits respectively control the AC output or charging input, thereby increasing the AC output voltage or performing series charging; if the inverter implements parallel discharge or parallel charging, a control instruction is sent to one of the unit control circuits via a control chip, so that the unit control circuit receiving the control instruction controls multiple inverters to synchronously output AC power or synchronously charge, thereby increasing the AC output power or performing parallel charging, and can achieve flexible combined output and charging control of multiple groups of rechargeable batteries according to usage requirements.

[0054] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A control circuit for battery combination connection, characterized in that: The control circuit includes at least two unit control circuits, the signal output end of each unit control circuit is connected to the signal input end of at least one inverter, the voltage input end of each inverter is connected to at least one group of batteries, so as to achieve battery expansion; the voltage output end of each inverter is connected to the output interface; The unit control circuit includes a first control chip, a second control chip and a signal output circuit; The second pin of the first control chip is used as a first signal input terminal, and the third pin is used as a second signal input terminal; the first signal input terminal and the second signal input terminal are both connected to the control chip; The seventh pin of the first control chip is connected to the fourth pin of the second control chip, and the sixth pin of the first control chip is connected to the first pin of the second control chip; The sixth pin of the second control chip is connected to the first input end of the signal output circuit, and the seventh pin of the second control chip is connected to the second input end of the signal output circuit; the first signal output end and the second signal output end of the signal output circuit are used together as the signal output end of the unit control circuit; The grounding wires of the voltage output terminals of the inverter are connected to each other; When the inverter realizes series discharge or series charging, the phase line of the voltage output end of one inverter is connected to the first phase line output end and the third phase line output end of the output interface, the neutral line of the voltage output end of the inverter is connected to the neutral line of the voltage output end of another inverter, and the connection point is simultaneously connected to the second phase line output end and the sixth phase line output end of the output interface; the phase line of the voltage output end of another inverter is connected to the fourth phase line output end and the fifth phase line output end of the output interface; the signal input end of each inverter is respectively connected to the signal output end of a corresponding unit control circuit through the communication interface, so as to realize series boost and expand power discharge and boost and expand power charging; When the inverter realizes parallel discharge or parallel charging, the phase lines of the voltage output ends of the inverter are connected to each other and to the phase line output end of the output interface; the neutral lines of the voltage output ends of the inverter are connected to each other and to the neutral line output end of the output interface, and the ground lines of the voltage output ends of the inverter are connected to each other; the signal input end of each inverter is simultaneously connected to the signal output end of one of the unit control circuits through the communication interface, thereby realizing parallel expanded power discharge and expanded power charging.

2. The control circuit for battery combination connection according to claim 1, characterized in that: When the inverters realize parallel discharge, the phases of the alternating current output by the phase lines of the voltage output terminals of the two inverters are opposite; When the inverters realize series discharge, the phases of the alternating current output by the phase lines of the voltage output terminals of two or more inverters are the same.

3. The control circuit for battery combination connection according to claim 1 or 2, characterized in that: The signal output circuit includes a fifth inductor, a ninth inductor, a third inductor and a seventh inductor; One end of the fifth inductor is connected to the sixth pin of the second control chip as the first input end of the signal output circuit; one end of the ninth inductor is connected to the fifth pin of the second control chip as the second input end of the signal output circuit; The other end of the fifth inductor is connected to one end of the third inductor, and the other end of the ninth inductor is connected to one end of the seventh inductor; the other end of the third inductor serves as the first signal output end of the signal output circuit; and the other end of the seventh inductor serves as the second signal output end of the signal output circuit.

4. The control circuit for battery combination connection according to claim 3, characterized in that: The signal output circuit also includes a first bidirectional voltage regulator and a second bidirectional voltage regulator; One end of the first bidirectional voltage regulator is connected to the connection point between the fifth inductor and the third inductor, and the other end is connected to the ground; one end of the second bidirectional voltage regulator is connected to the connection point between the ninth inductor and the seventh inductor, and the other end is connected to the ground.

5. The control circuit for battery combination connection according to claim 4, characterized in that: The signal output circuit also includes a third bidirectional voltage regulator; Two ends of the third bidirectional voltage regulator are connected to the first signal output end and the second signal output end respectively.

6. The control circuit for battery combination connection according to claim 5, characterized in that: The signal output circuit also includes a second resistor; One end of the second resistor is connected to a connection point between the fifth inductor and the third inductor, and the other end of the second resistor is connected to a connection point between the ninth inductor and the seventh inductor.

7. The control circuit for battery combination connection according to claim 4, characterized in that: The first pin of the first control chip is connected to one end of a fifth capacitor, and the other end of the fifth capacitor is connected to the fourth pin of the first control chip and is grounded; The eighth pin of the first control chip is connected to the voltage-stabilized power supply terminal and one end of the sixth capacitor, and the other end of the sixth capacitor is connected to the eighth pin of the first control chip and is grounded.

8. The control circuit for battery combination connection according to claim 7, characterized in that: The third pin of the second control chip is connected to one end of the eighth capacitor and the standard voltage end; the other end of the eighth capacitor is connected to the ground end; The second pin of the second control chip is connected to the ground terminal; The fifth pin of the second control chip is connected to one end of the first resistor, and the other end of the first resistor is connected to the voltage-stabilized power supply end; The eighth pin of the second control chip is connected to one end of a third resistor, and the other end of the third resistor is connected to the ground end.

9. The control circuit for battery combination connection according to claim 8, characterized in that: The signal output end of the unit control circuit is connected to the corresponding signal input end of at least one inverter through a connecting socket; A first signal output end of the signal output end of the unit control circuit is connected to a first pin of the connection socket, and a second signal output end of the signal output end is connected to a second pin of the connection socket; The ground terminal is connected to the third pin of the connection socket; The voltage-stabilized power supply terminal is connected to the fourth pin of the connection socket.

10. A control method for battery combination connection, characterized in that: The control method is applied to the control circuit for battery combination connection according to any one of claims 1 to 9, and the control method comprises: The control chip receives the input control instruction; If the control instruction is series discharge, the control chip sends a first control instruction and a second control instruction to the two unit control circuits respectively, so that the two unit control circuits independently control the phase of the AC power output by the phase lines of the voltage output terminals of the two inverters; If the control instruction is parallel discharge, one of the unit control circuits is determined to be the target unit control circuit, and the control chip sends a parallel control instruction to the target unit control circuit so that the target unit control circuit simultaneously controls the phase of the AC power output by the phase lines of the voltage output ends of two or more inverters.

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