CN107154665B - Charging and discharging combiner and power supply system - Google Patents
Charging and discharging combiner and power supply system Download PDFInfo
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- CN107154665B CN107154665B CN201710596248.2A CN201710596248A CN107154665B CN 107154665 B CN107154665 B CN 107154665B CN 201710596248 A CN201710596248 A CN 201710596248A CN 107154665 B CN107154665 B CN 107154665B
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- 238000007599 discharging Methods 0.000 title claims description 39
- 238000001514 detection method Methods 0.000 claims description 46
- 238000012545 processing Methods 0.000 claims description 24
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 14
- 230000003071 parasitic effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H02J7/0021—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
Abstract
The invention discloses a charge-discharge combiner and a power supply system, wherein the power supply system comprises N battery packs, the charge-discharge combiner comprises N charge-discharge modules which are in one-to-one correspondence with the battery packs and are used for controlling charge and discharge of the battery packs corresponding to the charge-discharge modules according to preset charge-discharge voltage and preset charge-discharge current, one end of each charge-discharge module is connected with the corresponding battery pack, and the other end of each charge-discharge module is connected with a direct current bus. In this application, each group battery is connected to direct current busbar through the charge and discharge module rather than corresponding, and charge and discharge module can control the charge and discharge of group battery rather than corresponding, need not direct parallelly connected between each group battery, no matter exist between the group battery and do not have the pressure differential, all do not have the condition of mutual discharge between the group battery, and security and reliability are high. In addition, the battery pack can be utilized to the maximum degree on the premise that the performance of each battery pack is stable.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging, in particular to a charging and discharging combiner and a power supply system.
Background
With the rapid development of information technology and data services, especially the rapid development of 3G and 4G networks, the number of loads of communication base stations increases and the number of loads is diversified, and the battery pack configured in the early stage of construction cannot meet the requirement of the increased loads, and in this case, the battery pack needs to be added to ensure reliable power supply of the communication base stations. However, this is difficult to avoid the problem that the battery packs have differences (e.g., different battery voltages and internal resistances). In addition, in the prior art, the battery packs are connected with the direct current buses after being directly connected in parallel, and are powered by the direct current buses or charged by the direct current buses, and because the battery packs are different in charging and discharging voltage and resistance, when the battery packs are charged and discharged, voltage difference can occur between the battery packs, so that the battery packs are mutually discharged, the battery packs can be burnt out, and the safety and reliability are low.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The invention aims to provide a charge-discharge combiner and a power supply system, wherein all battery packs are not required to be directly connected in parallel, no pressure difference exists between the battery packs, no mutual discharge condition exists between the battery packs, and the safety and the reliability are high. In addition, the charging voltage and the charging and discharging current of each battery pack can be independently set according to the difference of each battery pack, and each battery pack can be utilized to the maximum degree on the premise of ensuring the stability of the performance of each battery pack.
In order to solve the technical problems, the invention provides a charge-discharge combiner which is applied to a power supply system, wherein the power supply system comprises N battery packs, N is a positive integer, the charge-discharge combiner comprises N charge-discharge modules which are in one-to-one correspondence with the battery packs and are used for controlling charge and discharge of the battery packs corresponding to the charge-discharge modules according to preset charge-discharge voltage and preset charge-discharge current, one end of each charge-discharge module is connected with the battery pack corresponding to the charge-discharge module, and the other end of each charge-discharge module is connected with a direct current bus.
Preferably, the charge and discharge module includes:
the micro control unit MCU and the charge and discharge execution module connected with the MCU are used for controlling the charge and discharge of the corresponding battery pack through the charge and discharge execution module according to preset charge and discharge voltage and preset charge and discharge current.
Preferably, the charge-discharge execution module includes a first PMOS and its driving circuit, a second PMOS and its driving circuit, a third PMOS and its driving circuit, a fourth PMOS and its driving circuit, a fifth PMOS and its driving circuit, a sixth PMOS and its driving circuit, an NMOS and its driving circuit, an eighth PMOS and its driving circuit, an inductor, a voltage stabilizing capacitor, and a diode, and each MOS transistor includes a parasitic diode, wherein:
the MCU is correspondingly connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube, the drain electrode of the first PMOS is connected with the drain electrode of the eighth PMOS, the source electrode of the eighth PMOS is respectively connected with the positive bus of the direct current bus, the positive end of the voltage stabilizing capacitor and the source electrode of the sixth PMOS, the drain electrode of the sixth PMOS is connected with the drain electrode of the fifth PMOS, the source electrode of the fifth PMOS is respectively connected with the drain electrode of the second PMOS and the first end of the inductor, the second end of the inductor is respectively connected with the source electrode of the first PMOS, the source electrode of the fourth PMOS, the drain electrode of the NMOS and the cathode of the diode, the source electrode of the third PMOS is respectively connected with the source electrode of the second PMOS and the positive electrode of the corresponding battery pack, and the source electrode of the NMOS is respectively connected with the anode of the diode, the negative electrode of the battery pack, the negative electrode of the direct current bus and the negative electrode of the voltage stabilizing capacitor.
Preferably, the charge-discharge execution module includes a first NMOS and its driving circuit, a second NMOS and its driving circuit, a third NMOS and its driving circuit, a fourth NMOS and its driving circuit, a fifth NMOS and its driving circuit, a sixth NMOS and its driving circuit, a PMOS and its driving circuit, an eighth NMOS and its driving circuit, an inductor, a voltage stabilizing capacitor, and a diode, and each MOS transistor includes a parasitic diode, wherein:
the MCU is correspondingly connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube, the source electrode of the first NMOS is respectively connected with the cathode of the corresponding battery pack and the source electrode of the third NMOS, and the drain electrode of the first NMOS is respectively connected with the first end of the inductor and the eighth NMOS
The source electrode of the NMOS is connected, the drain electrode of the eighth NMOS is connected with the drain electrode of the second NMOS, the source electrode of the second NMOS is respectively connected with the source electrode of the sixth NMOS, the negative end of the voltage stabilizing capacitor and the negative bus of the direct current bus, the drain electrode of the third NMOS is connected with the drain electrode of the fourth NMOS, the source electrode of the fourth NMOS is respectively connected with the second end of the inductor, the source electrode of the fifth NMOS, the source electrode of the PMOS and the anode of the diode, the drain electrode of the fifth NMOS is connected with the drain electrode of the sixth NMOS, and the drain electrode of the PMOS is respectively connected with the positive electrode of the corresponding battery pack, the cathode of the diode, the positive end of the voltage stabilizing capacitor and the positive bus of the direct current bus.
Preferably, the charge-discharge combiner further includes a charge-discharge module controller, and the charge-discharge module controller includes:
the device comprises a processing module, a parameter setting module and a communication module, wherein the parameter setting module and the communication module are respectively connected with the processing module, the parameter setting module is used for setting or modifying preset charge-discharge voltage and preset charge-discharge current of each battery pack through the processing module, and the processing module is used for sending the preset charge-discharge voltage and preset charge-discharge current after resetting to a corresponding MCU through the communication module.
Preferably, the parameter setting module is further configured to set a type of each battery pack;
the MCU is also used for controlling the discharging sequence of the battery packs according to the types of the battery packs and the preset priority when the battery packs are discharged.
Preferably, the charge and discharge module controller further comprises:
and the display module is connected with the processing module and used for displaying the preset charge-discharge voltage and the preset charge-discharge current set by the parameter setting module.
Preferably, the charge and discharge module further includes:
a battery pack voltage detection circuit for detecting a voltage of a battery pack corresponding to the charge-discharge module;
a current detection circuit for detecting a charge-discharge current of a battery pack corresponding to the charge-discharge module;
a DC bus voltage detection circuit for detecting a voltage of the DC bus;
the MCU is also connected with the voltage detection circuit, the current detection circuit and the direct current bus voltage detection circuit respectively and used for sending the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus to the processing module;
the display module is also used for receiving and displaying the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus through the processing module.
Preferably, the current detection circuit includes:
the first current detection resistor is arranged on the negative side of the battery pack corresponding to the charge-discharge module and used for detecting a first charge-discharge current;
the input end of the first current detection circuit is connected with the first current detection resistor, and the output end of the first current detection circuit is connected with the MCU;
the second current detection resistor is arranged on the negative bus side of the direct current bus and used for detecting second charge and discharge current;
the input end of the second current detection circuit is connected with the second current detection resistor, and the output end of the second current detection circuit is connected with the MCU;
the MCU is used for sending the first charge-discharge current and the second charge-discharge current to the processing module so that the display module displays the first charge-discharge current and the second charge-discharge current.
In order to solve the technical problems, the invention also provides a power supply system which comprises N battery packs, wherein N is a positive integer, and the power supply system further comprises the charge-discharge combiner.
The invention provides a charge-discharge combiner which is applied to a power supply system, wherein the power supply system comprises N battery packs, N is a positive integer, the charge-discharge combiner comprises N charge-discharge modules which are in one-to-one correspondence with the battery packs and are used for controlling charge and discharge of the battery packs corresponding to the charge-discharge modules according to preset charge-discharge voltage and preset charge-discharge current, one end of each charge-discharge module is connected with the corresponding battery pack, and the other end of each charge-discharge module is connected with a direct current bus.
Therefore, in the application, each battery pack is connected to the direct current bus through the corresponding charging and discharging module, the charging and discharging module can control the charging and discharging of the corresponding battery pack, each battery pack is not required to be directly connected in parallel, no matter no pressure difference exists between the battery packs, no mutual discharging condition exists between the battery packs, and the safety and reliability are high. In addition, the charging voltage and the charging and discharging current of each battery pack can be independently set according to the difference of each battery pack, and each battery pack can be utilized to the maximum degree on the premise of ensuring the stability of the performance of each battery pack.
The power supply system has the same beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a charge-discharge combiner provided by the present invention;
fig. 2 is a schematic structural diagram of a charge-discharge execution module according to the present invention;
fig. 3 is a schematic structural diagram of another charge-discharge execution module according to the present invention.
Detailed Description
The core of the invention is to provide a charge-discharge combiner and a power supply system, each battery pack is not required to be directly connected in parallel, no matter the pressure difference exists between the battery packs, the condition of mutual discharge between the battery packs does not exist, and the safety and the reliability are high. In addition, the charging voltage and the charging and discharging current of each battery pack can be independently set according to the difference of each battery pack, and each battery pack can be utilized to the maximum degree on the premise of ensuring the stability of the performance of each battery pack.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a charge-discharge combiner provided by the present invention, where the charge-discharge combiner is applied to a power supply system, the power supply system includes N battery packs, N is a positive integer, the charge-discharge combiner includes N charge-discharge modules 1 corresponding to the battery packs one by one and configured to control charge and discharge of the corresponding battery packs according to a preset charge-discharge voltage and a preset charge-discharge current, one end of each charge-discharge module 1 is connected with the corresponding battery pack, and the other end of each charge-discharge module 1 is connected with a dc bus.
Specifically, the application has all set up a charge-discharge module 1 between every group battery and direct current busbar, and charge-discharge module 1 can regard as two port network, and one end is directly hung on the direct current busbar through the wire, and the other end is connected to the positive negative pole of group battery through the wire, and charge-discharge module 1 is used for controlling the charge-discharge of group battery. The charge and discharge control herein includes whether charge and discharge are performed or not and the magnitudes of the voltage and current of the charge and discharge when the charge and discharge are performed.
In this way, the individual battery packs are not required to be connected in parallel as in the prior art, and the occurrence of a circulation due to a pressure difference between the parallel battery packs is indirectly avoided. In addition, when the battery packs of different types or the battery packs of the same type are different in service time and cause the difference between the battery packs, the charging and discharging current and the charging and discharging voltage of the corresponding battery packs can be independently set through the charging and discharging module 1, and the battery packs can be maximally utilized on the premise of ensuring the stable performance of the battery packs, so that the efficiency of a power supply system is improved.
The invention provides a charge-discharge combiner which is applied to a power supply system, wherein the power supply system comprises N battery packs, N is a positive integer, the charge-discharge combiner comprises N charge-discharge modules which are in one-to-one correspondence with the battery packs and are used for controlling charge and discharge of the battery packs corresponding to the charge-discharge modules according to preset charge-discharge voltage and preset charge-discharge current, one end of each charge-discharge module is connected with the corresponding battery pack, and the other end of each charge-discharge module is connected with a direct current bus.
Therefore, in the application, each battery pack is connected to the direct current bus through the corresponding charging and discharging module, the charging and discharging module can control the charging and discharging of the corresponding battery pack, each battery pack is not required to be directly connected in parallel, no matter no pressure difference exists between the battery packs, no mutual discharging condition exists between the battery packs, and the safety and reliability are high. In addition, the charging voltage and the charging and discharging current of each battery pack can be independently set according to the difference of each battery pack, and each battery pack can be utilized to the maximum degree on the premise of ensuring the stability of the performance of each battery pack.
Based on the above embodiment:
as a preferred embodiment, the charge and discharge module 1 includes:
the micro control unit MCU and the charge and discharge execution module connected with the MCU are used for controlling the charge and discharge of the corresponding battery pack through the charge and discharge execution module according to the preset charge and discharge voltage and the preset charge and discharge current.
Specifically, the preset charge-discharge voltage and preset charge-discharge current of the battery pack are set in the MCU, where the preset charge-discharge voltage and preset charge-discharge current may be set when leaving the factory, or may be reset according to actual needs after leaving the factory, and the application is not limited in particular herein, and is determined according to actual situations.
As a preferred embodiment, the charge-discharge execution module includes a first PMOS Q11 and its driving circuit, a second PMOS Q12 and its driving circuit, a third PMOS Q13 and its driving circuit, a fourth PMOS Q14 and its driving circuit, a fifth PMOS Q15 and its driving circuit, a sixth PMOS Q16 and its driving circuit, an NMOS Q17 and its driving circuit, an eighth PMOS Q18 and its driving circuit, an inductance L, a stabilizing capacitor C, and a diode D17, and each MOS transistor includes a parasitic diode, wherein:
MCU is connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube correspondingly, the drain electrode of the first PMOS Q11 is connected with the drain electrode of the eighth PMOS, the source electrode of the eighth PMOS is connected with the positive bus of the direct current bus, the positive end of the voltage stabilizing capacitor C and the source electrode of the sixth PMOS Q16 respectively, the drain electrode of the sixth PMOS Q16 is connected with the drain electrode of the fifth PMOS Q15, the source electrode of the fifth PMOS Q15 is connected with the drain electrode of the second PMOS Q12 and the first end of the inductor L respectively, the second end of the inductor L is connected with the source electrode of the first PMOS Q11, the source electrode of the fourth PMOS Q14, the drain electrode of the NMOS and the cathode of the diode D17 respectively, the source electrode of the fourth PMOS Q14 is connected with the drain electrode of the third PMOS Q13 respectively, the source electrode of the third PMOS Q13 is connected with the positive electrode of the second PMOS Q12 and the corresponding battery pack, and the source electrode of the NMOS is connected with the anode of the diode D17, the negative electrode of the battery pack, the bus of the direct current bus and the negative end of the voltage stabilizing capacitor C respectively.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a charge/discharge execution module according to the present invention.
Specifically, the charge-discharge execution module comprises a buck topological structure for charging the battery pack by the direct current bus and a buck & boost topological structure for discharging the direct current bus by the battery pack, and the MCU realizes the control of charge-discharge current and voltage when the direct current bus charges the battery pack or when the battery pack discharges the direct current bus by controlling the corresponding MOS tube.
Specifically, in the charging stage of the battery pack by the direct current bus, the charging and discharging module 1 adopts a buck step-down topological structure: the NMOS Q17, the third PMOS Q13, the fourth PMOS Q14, the fifth PMOS Q15 and the sixth PMOS Q16 are in an off state, the second PMOS Q12 is in an on state, and the MCU outputs PWM signals to control the on-off of the first PMOS Q11 and the eighth PMOS Q18. The first PMOS Q11 and the eighth PMOS Q18 are simultaneously conducted, current is stored by a direct current bus-the eighth PMOS Q18-the first PMOS Q11-an inductor L-the second PMOS Q12-the battery pack-the first current detecting resistor-the second current detecting resistor-the direct current bus and the inductor L; in the simultaneous turn-off stage of the first PMOS Q11 and the eighth PMOS Q18, the current is discharged from the inductor L, the second PMOS Q12, the battery pack, the first current detecting resistor, the diode D17, the inductor L and the inductor L.
In the stage that the battery pack discharges the direct current bus through the charge and discharge module 1, the charge and discharge module 1 is in a discharge boost topological structure, the charge and discharge module 1 with the highest voltage of the battery pack outputs the direct current bus in a constant voltage output mode, and the charge and discharge modules 1 corresponding to other battery packs output constant current.
When the plurality of battery packs (N is not less than 2) discharge the direct current bus, the charge and discharge module 1 adopts a boost topology structure: the third PMOS Q13, the fourth PMOS Q14, the fifth PMOS Q15 and the sixth PMOS Q16 are in an off state, the second PMOS Q12 is in an on state, and the MCU outputs PWM signals to control the on-off of the NMOS tube Q17, the first PMOS Q11 and the eighth PMOS Q18. The first PMOS Q11 and the eighth PMOS Q18 are simultaneously in an off state, the NMOS tube Q17 is in an on state, and the current is stored by the battery pack, the second PMOS Q12, the inductor L, the NMOS tube Q17, the first current detecting resistor and the battery pack, and the inductor L; the first PMOS Q11 and the eighth PMOS Q18 are simultaneously in an on state, the NMOS tube Q17 is in an off state, and the current is discharged from the battery pack, the second PMOS Q12, the inductor L, the first PMOS Q11, the eighth PMOS Q18, the direct current bus, the second current detecting resistor, the first current detecting resistor, the battery pack and the inductor L.
In the stage of discharging the direct-current bus by a single battery pack, the charge-discharge module 1 adopts a buck step-down topological structure: the NMOS tube Q17, the first PMOS Q11, the eighth PMOS Q18 and the second PMOS Q12 are in an off state, the fifth PMOS Q15 and the sixth PMOS Q16 are in an on state, and the MCU outputs PWM signals to control the on-off of the third PMOS Q13 and the fourth PMOS Q14. The third PMOS Q13 and the fourth PMOS Q14 are in a conducting state, and the current is stored by a battery pack, the third PMOS Q13, the fourth PMOS Q14, an inductor L, a fifth PMOS Q15, a sixth PMOS Q16, a direct current bus, a second current detecting resistor, a first current detecting resistor, a battery pack and the inductor L; the third PMOS Q13 and the fourth PMOS Q14 are in an off state, and the current is discharged by the inductor L, the fifth PMOS Q15, the sixth PMOS Q16, the direct current bus, the second current detecting resistor, the diode D17 and the inductor L.
The MCU realizes the charge and discharge of the battery pack to the direct current bus by controlling the on and off of the corresponding MOS tube, and can realize the seamless switching of the charge and discharge of the battery pack to the direct current bus; the control of the magnitude of the charge-discharge current is also achieved by controlling the duty cycle of the PWM signal.
As a preferred embodiment, the charge-discharge execution module includes a first NMOS Q21 and its driving circuit, a second NMOS Q22 and its driving circuit, a third NMOS Q23 and its driving circuit, a fourth NMOS Q24 and its driving circuit, a fifth NMOS Q25 and its driving circuit, a sixth NMOS Q26 and its driving circuit, a PMOS Q27 and its driving circuit, an eighth NMOS Q28 and its driving circuit, an inductance L, a stabilizing capacitor C, and a diode D27, and each MOS transistor includes a parasitic diode, wherein:
MCU is connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube correspondingly, the source electrode of the first NMOS Q21 is connected with the negative electrode of the corresponding battery pack and the source electrode of the third NMOS Q23 respectively, the drain electrode of the first NMOS Q21 is connected with the first end of the inductor L and the source electrode of the eighth NMOS Q28 respectively, the drain electrode of the eighth NMOS Q28 is connected with the drain electrode of the second NMOS Q22, the source electrode of the second NMOS Q22 is connected with the source electrode of the sixth NMOS Q26 respectively, the negative end of the voltage stabilizing capacitor C and the negative bus of the direct current bus, the drain electrode of the third NMOS Q23 is connected with the drain electrode of the fourth NMOS Q24 respectively, the source electrode of the fourth NMOS Q24 is connected with the second end of the inductor L, the source electrode of the fifth NMOS Q25, the source electrode of the PMOS and the anode of the diode D27 respectively, the drain electrode of the fifth NMOS Q25 is connected with the drain electrode of the sixth NMOS Q26 respectively, and the drain electrode of the PMOS Q27 is connected with the positive electrode of the corresponding battery pack, the cathode of the diode D27 and the positive end of the direct current bus.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another charge/discharge execution module according to the present invention.
The working principle of the charge-discharge execution module in this embodiment is the same as that of the charge-discharge execution module in the above embodiment, but one is that the charge-discharge execution module is arranged on the positive electrode line between the battery and the dc bus, and the other is arranged on the negative electrode line between the battery and the dc bus, which has the same beneficial effects as those of the above embodiment.
As a preferred embodiment, the charge-discharge combiner further includes a charge-discharge module controller, the charge-discharge module controller including:
the system comprises a processing module, a parameter setting module and a communication module, wherein the parameter setting module and the communication module are respectively connected with the processing module, the parameter setting module is used for setting or modifying preset charge-discharge voltage and preset charge-discharge current of each battery pack through the processing module, and the processing module is used for sending the preset charge-discharge voltage and preset charge-discharge current after resetting to a corresponding MCU through the communication module.
In general, an initial preset charge-discharge voltage and preset charge-discharge current are built in the MCU of the charge-discharge module 1, but in practical application, as the service time of the battery pack is longer or the external working environment is changed, the performance of the battery pack is also changed.
In addition, the communication module may be an RS485 communication module, that is, may be another type of communication module, and the present invention is not limited herein, and is determined according to practical situations.
In addition, the parameter setting module may be a key control circuit, and the user may continue to preset the setting of the charge-discharge voltage and the preset charge-discharge current through the key. Of course, the parameter setting module herein may be other types of parameter setting modules, such as a touch screen, and the present invention is not limited herein.
As a preferred embodiment, the parameter setting module is further configured to set the type of each battery pack;
the MCU is also used for controlling the discharging sequence of the battery packs according to the types and preset priorities of the battery packs when the battery packs are discharged.
Specifically, considering that the charging and discharging performance of the battery packs are different, when the N battery packs include a plurality of battery packs, in order to maximize the utilization of each battery pack, the charging and discharging module controller in the present application further has a battery pack priority setting function, for example, when the battery packs include a lead-acid battery pack and a lithium battery pack, in order to exert the advantage of good cycle performance of the lithium battery pack, the preset priority may be a lithium battery-lead-acid battery, and the MCU controls the lithium battery to be discharged preferentially according to the preset priority after receiving the types of the battery packs set by the parameter setting module.
As a preferred embodiment, the charge and discharge module controller further includes:
the display module is connected with the processing module and used for displaying the preset charge-discharge voltage and the preset charge-discharge current set by the parameter setting module.
In order to facilitate users to intuitively see the preset charge-discharge voltage and preset charge-discharge current which are set by the users, the charge-discharge module controller further comprises a display module for displaying the preset charge-discharge voltage and preset charge-discharge current which are set by the parameter setting module, so that user experience is improved.
The display module may be an LED display module or a liquid crystal display, and the present invention is not particularly limited herein, and may be determined according to actual circumstances.
As a preferred embodiment, the charge and discharge module 1 further includes:
a battery pack voltage detection circuit for detecting a voltage of the battery pack corresponding to the charge-discharge module 1;
a current detection circuit for detecting a charge-discharge current of the battery pack corresponding to the charge-discharge module 1;
a DC bus voltage detection circuit for detecting a voltage of the DC bus;
the MCU is also connected with the voltage detection circuit, the current detection circuit and the direct current bus voltage detection circuit respectively and used for sending the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus to the processing module;
the display module is also used for receiving and displaying the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus through the processing module.
Specifically, the charging and discharging module 1 also collects the voltage, the charging and discharging current and the voltage of the direct current bus of the battery pack, and displays the collected voltage, the charging and discharging current and the voltage of the direct current bus on the display module, so that a user can know the charging and discharging voltage and the charging and discharging current of the battery pack in time, and the preset charging and discharging voltage and the preset charging and discharging current can be conveniently adjusted.
The charging and discharging module 1 further comprises an LED display module for displaying the electric quantity of the battery pack and the like.
As a preferred embodiment, the current detection circuit includes:
a first current detection resistor provided on the negative electrode side of the battery pack corresponding to the charge/discharge module 1 and configured to detect a first charge/discharge current;
the input end of the first current detection circuit is connected with the first current detection resistor, and the output end of the first current detection circuit is connected with the MCU;
the second current detection resistor is arranged on the negative bus side of the direct current bus and used for detecting second charge and discharge current;
the input end of the second current detection circuit is connected with the second current detection resistor, and the output end of the second current detection circuit is connected with the MCU;
the MCU is used for sending the first charge-discharge current and the second charge-discharge current to the processing module so that the display module displays the first charge-discharge current and the second charge-discharge current.
Specifically, adopt the current detection resistance to realize the collection to the electric current in this application, with low costs and small.
In order to solve the technical problems, the invention also provides a power supply system which comprises N battery packs, wherein N is a positive integer, and the power supply system further comprises a charge-discharge combiner.
For the description of the power supply system provided by the present invention, refer to the above embodiment, and the description of the present invention is omitted herein.
It should be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The charge-discharge combiner is applied to a power supply system, and comprises N battery packs, wherein N is a positive integer; the charge and discharge module controls charge and discharge, and comprises: controlling whether charging and discharging are performed or not and the magnitudes of the voltage and the current of the charging and discharging when the charging and discharging are performed;
the charge-discharge module includes: the micro control unit MCU and the charge-discharge execution module are connected with the MCU, and the MCU is used for controlling the charge and discharge of the corresponding battery pack through the charge-discharge execution module according to preset charge-discharge voltage and preset charge-discharge current;
the MCU controls the charge and discharge current by controlling the duty ratio of the PWM signal.
2. The charge-discharge combiner of claim 1, wherein the charge-discharge execution module comprises a first PMOS and its driving circuit, a second PMOS and its driving circuit, a third PMOS and its driving circuit, a fourth PMOS and its driving circuit, a fifth PMOS and its driving circuit, a sixth PMOS and its driving circuit, an NMOS and its driving circuit, an eighth PMOS and its driving circuit, an inductor, a voltage stabilizing capacitor, and a diode, and each MOS transistor comprises a parasitic diode, wherein:
the MCU is correspondingly connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube, the drain electrode of the first PMOS is connected with the drain electrode of the eighth PMOS, the source electrode of the eighth PMOS is respectively connected with the positive bus of the direct current bus, the positive end of the voltage stabilizing capacitor and the source electrode of the sixth PMOS, the drain electrode of the sixth PMOS is connected with the drain electrode of the fifth PMOS, the source electrode of the fifth PMOS is respectively connected with the drain electrode of the second PMOS and the first end of the inductor, the second end of the inductor is respectively connected with the source electrode of the first PMOS, the source electrode of the fourth PMOS, the drain electrode of the NMOS and the cathode of the diode, the source electrode of the third PMOS is respectively connected with the source electrode of the second PMOS and the positive electrode of the corresponding battery pack, and the source electrode of the NMOS is respectively connected with the anode of the diode, the negative electrode of the battery pack, the negative electrode of the direct current bus and the negative electrode of the voltage stabilizing capacitor.
3. The charge-discharge combiner of claim 1, wherein the charge-discharge execution module comprises a first NMOS and its driving circuit, a second NMOS and its driving circuit, a third NMOS and its driving circuit, a fourth NMOS and its driving circuit, a fifth NMOS and its driving circuit, a sixth NMOS and its driving circuit, a PMOS and its driving circuit, an eighth NMOS and its driving circuit, an inductor, a voltage stabilizing capacitor, and a diode, and each MOS transistor comprises a parasitic diode, wherein:
the MCU is correspondingly connected with the grid electrode of each MOS tube through the driving circuit of each MOS tube, the source electrode of the first NMOS is respectively connected with the cathode of the corresponding battery pack and the source electrode of the third NMOS, the drain electrode of the first NMOS is respectively connected with the first end of the inductor and the source electrode of the eighth NMOS, the drain electrode of the eighth NMOS is respectively connected with the drain electrode of the second NMOS, the source electrode of the second NMOS is respectively connected with the source electrode of the sixth NMOS, the negative end of the voltage stabilizing capacitor and the negative bus of the direct current bus, the drain electrode of the third NMOS is connected with the drain electrode of the fourth NMOS, the source electrode of the fourth NMOS is respectively connected with the second end of the inductor, the source electrode of the fifth NMOS, the source electrode of the PMOS and the anode of the diode, the drain electrode of the fifth NMOS is respectively connected with the drain electrode of the sixth NMOS, and the drain electrode of the PMOS is respectively connected with the positive electrode of the corresponding battery pack, the positive end of the voltage stabilizing capacitor and the positive bus of the direct current bus.
4. A charge-discharge combiner as claimed in claim 2 or 3, wherein the charge-discharge combiner further comprises a charge-discharge module controller comprising:
the device comprises a processing module, a parameter setting module and a communication module, wherein the parameter setting module and the communication module are respectively connected with the processing module, the parameter setting module is used for setting or modifying preset charge-discharge voltage and preset charge-discharge current of each battery pack through the processing module, and the processing module is used for sending the preset charge-discharge voltage and preset charge-discharge current after resetting to a corresponding MCU through the communication module.
5. The charge-discharge combiner of claim 4, wherein the parameter setting module is further configured to set a type of each battery pack;
the MCU is also used for controlling the discharging sequence of the battery packs according to the types of the battery packs and the preset priority when the battery packs are discharged.
6. The charge-discharge combiner of claim 4, wherein the charge-discharge module controller further comprises:
and the display module is connected with the processing module and used for displaying the preset charge-discharge voltage and the preset charge-discharge current set by the parameter setting module.
7. The charge-discharge combiner of claim 6, wherein the charge-discharge module further comprises:
a battery pack voltage detection circuit for detecting a voltage of a battery pack corresponding to the charge-discharge module;
a current detection circuit for detecting a charge-discharge current of a battery pack corresponding to the charge-discharge module;
a DC bus voltage detection circuit for detecting a voltage of the DC bus;
the MCU is also connected with the voltage detection circuit, the current detection circuit and the direct current bus voltage detection circuit respectively and used for sending the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus to the processing module;
the display module is also used for receiving and displaying the voltage of the battery pack, the charge and discharge current of the battery pack and the voltage of the direct current bus through the processing module.
8. The charge-discharge combiner of claim 7, wherein the current detection circuit comprises:
the first current detection resistor is arranged on the negative side of the battery pack corresponding to the charge-discharge module and used for detecting a first charge-discharge current;
the input end of the first current detection circuit is connected with the first current detection resistor, and the output end of the first current detection circuit is connected with the MCU;
the second current detection resistor is arranged on the negative bus side of the direct current bus and used for detecting second charge and discharge current;
the input end of the second current detection circuit is connected with the second current detection resistor, and the output end of the second current detection circuit is connected with the MCU;
the MCU is used for sending the first charge-discharge current and the second charge-discharge current to the processing module so that the display module displays the first charge-discharge current and the second charge-discharge current.
9. A power supply system comprising N battery packs, N being a positive integer, characterized by further comprising a charge-discharge combiner according to any one of claims 1-8.
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| CN107947330B (en) * | 2017-12-28 | 2023-09-19 | 杭州创乐电子科技有限公司 | Multi-group battery power supply automatic switching device and control method |
| CN110138051A (en) * | 2019-06-17 | 2019-08-16 | 中国铁塔股份有限公司 | A kind of cell managing device, system and control method |
| CN110544798A (en) * | 2019-09-12 | 2019-12-06 | 浙江齐享科技有限公司 | Battery pack parallel management module, energy storage power station and combined energy storage power station |
| CN113541256A (en) * | 2021-07-21 | 2021-10-22 | 研祥智慧物联科技有限公司 | Discharge method and discharge system |
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