CN111799883A - Lithium battery power supply system for supplying power to series connection hot backup uninterrupted power supply - Google Patents
Lithium battery power supply system for supplying power to series connection hot backup uninterrupted power supply Download PDFInfo
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- CN111799883A CN111799883A CN202010575171.2A CN202010575171A CN111799883A CN 111799883 A CN111799883 A CN 111799883A CN 202010575171 A CN202010575171 A CN 202010575171A CN 111799883 A CN111799883 A CN 111799883A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 78
- 238000004891 communication Methods 0.000 claims abstract description 165
- 230000001052 transient effect Effects 0.000 claims description 106
- 230000001629 suppression Effects 0.000 claims description 96
- 238000002955 isolation Methods 0.000 claims description 82
- 230000003287 optical effect Effects 0.000 claims description 79
- 238000010168 coupling process Methods 0.000 claims description 75
- 238000005859 coupling reaction Methods 0.000 claims description 75
- 230000008878 coupling Effects 0.000 claims description 73
- 208000015778 Undifferentiated pleomorphic sarcoma Diseases 0.000 claims description 38
- 230000005540 biological transmission Effects 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 7
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000004402 ultra-violet photoelectron spectroscopy Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
- H03K19/017572—Coupling arrangements; Impedance matching circuits using opto-electronic devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a lithium battery power supply system for supplying power to a series connection hot backup uninterrupted power supply, which comprises: lithium battery system, dual-circuit power supply output circuit and dual-circuit communication signal output circuit, lithium battery system is connected with main UPS and reserve UPS respectively, main UPS includes first rectifier, first inverter and first bypass switch, reserve UPS includes second rectifier, second inverter and second bypass switch, and the commercial power passes through first rectifier is connected to first inverter, first inverter is connected to the load, the second rectifier passes through the second inverter is connected to first bypass switch, first bypass switch is connected to the load, second bypass switch and mains connection. The invention can simultaneously supply power to two series hot backup UPS and carry out mutual communication; on the basis, the two paths of communication loops are not interfered with each other, and the device has a protection function and high reliability and stability.
Description
Technical Field
The invention relates to a lithium battery power supply system, in particular to a lithium battery power supply system for supplying power to a series connection hot backup uninterrupted power supply.
Background
In the fields of industrial manufacturing and informatization, the continuous and stable operation of a power supply system matched with equipment is a premise for ensuring the normal operation of the equipment. An Uninterruptible Power Supply (UPS) is a device that provides "backup Power" for important devices. When the mains supply is not powered off, the unstable mains supply can provide stable power supply for equipment after being converted by the UPS; when the commercial power is disconnected, the UPS is seamlessly switched from the commercial power mode to the battery mode, the direct current output by the battery is inverted into alternating current to supply power to the equipment, the equipment is prevented from power failure in the whole process, sufficient response time is reserved, and an operator is allowed to stop working procedures to save work such as data. Furthermore, in a place of important information equipment such as a bank with a stricter requirement on power supply stability, a hot standby UPS scheme adopting a redundant design is necessary. When one UPS fails, the other redundant UPS can quickly take over the work of the failed UPS.
At present, a plurality of lead-acid batteries are used as power supply batteries of the UPS, but with the development of lithium battery technology and the strong support of the state on new energy technology, the lithium iron phosphate batteries with high reliability and high energy density are adopted as the power supply batteries of the UPS, and the necessary development direction of the UPS system technology is formed. The hot backup UPS adopts a group of lithium batteries to simultaneously supply power to the UPS and the redundant UPS connected in series with the UPS, so that the technical requirements on the lithium battery system are brought forward by how to carry out mutual communication besides the uninterrupted power supply.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a lithium battery power supply system which can simultaneously supply power to two series hot backup UPSs and carry out mutual communication.
To this end, the present invention provides a lithium battery power supply system for supplying power to a serial hot backup ups, comprising: the dual-channel power supply system comprises a lithium battery system, a dual-channel power supply output circuit and a dual-channel communication signal output circuit, wherein the lithium battery system is respectively connected with a main UPS and a standby UPS, the main UPS comprises a first rectifier, a first inverter and a first bypass switch, the standby UPS comprises a second rectifier, a second inverter and a second bypass switch, a mains supply is connected to the first inverter through the first rectifier, the first inverter is connected to a load, the second rectifier is connected to the first bypass switch through the second inverter, the first bypass switch is connected to the load, and the second bypass switch is connected with the mains supply;
when the UPS works normally, the commercial power is connected to the load output through the first rectifier and the first inverter of the main UPS; when the main UPS fails, a first bypass switch of the main UPS is opened, the main UPS is switched to a bypass mode, the commercial power is connected to the load output through a second rectifier and a second inverter of the standby UPS and then connected to the load output through the first bypass switch of the main UPS, and at the moment, the standby UPS starts to work with a load;
when the mains supply is disconnected, the lithium battery system outputs direct current, and the direct current is connected to load output through a first inverter of the main UPS; when the main UPS fails, the first bypass switch of the main UPS is turned on to switch to a bypass mode, the lithium battery system outputs direct current to pass through the second inverter of the standby UPS and then is connected to load output through the first bypass switch of the main UPS, and the standby UPS starts to work with load at the moment.
The lithium battery system is further improved in that the two-way power supply output loop (also called two-way power loop) is adopted, the positive electrode and the negative electrode of a battery pack are respectively connected to the positive electrode and the negative electrode of a battery management system, the positive power output terminal and the negative power output terminal of the battery pack are respectively connected with the main UPS and the standby UPS, the positive power output terminal of the battery pack is directly connected with the positive electrode of the battery pack, and an MOS switch is arranged between the negative power output terminal of the battery pack and the negative electrode of the battery pack to realize the on-off control of the main loop; when the commercial power is disconnected, if the main UPS works normally, the lithium battery system supplies power to the main UPS; when the main UPS fails, the lithium battery system supplies power to the standby UPS.
The invention is further improved in that the lithium battery system comprises a B + end screw hole, a B-end screw hole, a P + end screw hole and a P-end screw hole, wherein the anode of the battery pack is connected to the B + end screw hole through a lead, the cathode of the battery pack is connected to the B-end screw hole through a lead, the power output positive end of the battery pack is connected to the P + end screw hole, the power output negative end of the battery pack is connected to the P-end screw hole, the P + end screw hole is connected to the anode of a connecting terminal, the P-end screw hole is connected to the cathode of the connecting terminal, and then the battery pack is divided into two parallel output ports through a one-to-two connecting line so as to be respectively connected to the primary battery input and the standby battery input of the UPS.
The lithium battery system further comprises a current detection unit, a discharge control unit and a charge control unit, wherein the B-end screw hole is connected to the discharge control unit through the current detection unit, the discharge control unit is connected to the P-end screw hole through the charge control unit, and the discharge control unit realizes the on-off control of a discharge MOS (metal oxide semiconductor) tube by receiving a control signal of an MCU (micro control unit) so as to realize enabling or disabling discharge; the charging control unit realizes the on-off control of the charging MOS tube by receiving the control signal of the MCU, and further realizes the charging of enabling or disabling.
The invention has the further improvement that the invention also comprises a communication circuit, the communication circuit comprises an MCU, the main UPS and the standby UPS are respectively connected to the lithium battery system through the MCU of the communication circuit to realize communication, and the two paths of communication signals are respectively and independently output to form a two-path communication signal output loop.
The communication circuit comprises a first communication signal optical coupling isolation module, a first communication sending signal optical coupling isolation unit, a first communication receiving signal optical coupling isolation unit and a first transient voltage suppression unit, wherein the first communication sending signal optical coupling isolation unit and the first communication receiving signal optical coupling isolation unit are respectively connected with the first transient voltage suppression unit, and the first communication receiving signal optical coupling isolation unit and the first communication sending signal optical coupling isolation unit are respectively connected with a first communication signal receiving and sending port of the MCU; the first communication sending signal optical coupling isolation unit and the first communication receiving signal optical coupling isolation unit achieve transmission of serial communication signals through the optical isolation chip.
The invention is further improved in that the first transient voltage suppression unit comprises a first transient voltage suppression diode, a second transient voltage suppression diode, a third transient voltage suppression diode and a fourth transient voltage suppression diode, the cathodes of the first transient voltage suppression diode and the second transient voltage suppression diode are respectively connected to a connection terminal, the anode of the third transient voltage suppression diode is connected to the anode of the first transient voltage suppression diode, the anode of the fourth transient voltage suppression diode is connected to the anode of the second transient voltage suppression diode, and the cathode of the third transient voltage suppression diode and the cathode of the fourth transient voltage suppression diode are both connected to the grounding terminals of the first communication transmission signal optical coupling isolation unit and the first communication reception signal optical coupling isolation unit; when the transient voltage of a communication loop where the communication circuit is located is too high, shunting is achieved through the first transient voltage suppression unit.
The communication circuit further comprises a second communication signal optical coupling isolation module, wherein the second communication signal optical coupling isolation module comprises a second communication sending signal optical coupling isolation unit, a second communication receiving signal optical coupling isolation unit and a second transient voltage suppression unit, the second communication sending signal optical coupling isolation unit and the second communication receiving signal optical coupling isolation unit are respectively connected with the second transient voltage suppression unit, and the second communication receiving signal optical coupling isolation unit and the second communication sending signal optical coupling isolation unit are respectively connected with a second communication signal receiving and sending port of the MCU; and the second communication sending signal optical coupling isolation unit and the second communication receiving signal optical coupling isolation unit realize the transmission of serial communication signals through the optical isolation chip.
A further improvement of the present invention is that the second transient voltage suppression unit includes a fifth transient voltage suppression diode, a sixth transient voltage suppression diode, a seventh transient voltage suppression diode and an eighth transient voltage suppression diode, cathodes of the fifth transient voltage suppression diode and the sixth transient voltage suppression diode are respectively connected to a connection terminal, an anode of the seventh transient voltage suppression diode is connected to an anode of the fifth transient voltage suppression diode, an anode of the eighth transient voltage suppression diode is connected to an anode of the sixth transient voltage suppression diode, a cathode of the seventh transient voltage suppression diode and a cathode of the eighth transient voltage suppression diode are both connected to grounding terminals of the second communication transmission signal optical coupling isolation unit and the second communication reception signal optical coupling isolation unit; when the transient voltage of a communication loop where the communication circuit is located is too high, shunting is achieved through the second transient voltage suppression unit.
The invention has the further improvement that the serial port ID of the standby UPS serial port data received by the lithium battery system serial port is added with 1, then the current serial port ID is judged, and if the received serial port is the default serial port ID, the serial port corresponding to the main UPS is used for sending data outwards; and if the received serial port is the serial port ID added with 1, using the serial port corresponding to the standby UPS to send data outwards.
Compared with the prior art, the invention has the beneficial effects that: the lithium battery system is designed, so that the lithium battery power supply system comprises two battery power loops and two communication loops, the lithium battery system can be communicated with the main UPS and the standby UPS at the same time on the basis of power supply of the hot standby UPS, and when the main UPS fails, the communication with the standby UPS is still maintained, so that the effects of simultaneously supplying power to the two hot standby UPSs in series connection and performing mutual communication are achieved; on the basis, through the design of the communication circuit, the two paths of communication loops are not interfered with each other and have a protection function, and the reliability and the stability of the lithium battery power supply system are further improved.
Drawings
FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a lithium battery system according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a main circuit of a lithium battery system according to an embodiment of the present invention;
FIG. 4 is a circuit schematic of the MCU of one embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a first communication signal opto-isolator module according to an embodiment of the present invention;
fig. 6 is a circuit schematic diagram of a second communication signal optical coupling isolation module according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, this embodiment provides a lithium battery power system for supplying power to a serial hot-backup ups, including: the dual-channel power supply system comprises a lithium battery system, a dual-channel power supply output circuit and a dual-channel communication signal output circuit, wherein the lithium battery system is respectively connected with a main UPS and a standby UPS, the main UPS comprises a first rectifier, a first inverter and a first bypass switch, the standby UPS comprises a second rectifier, a second inverter and a second bypass switch, a mains supply is connected to the first inverter through the first rectifier, the first inverter is connected to a load, the second rectifier is connected to the first bypass switch through the second inverter, the first bypass switch is connected to the load, and the second bypass switch is connected with the mains supply;
when the UPS works normally, the commercial power is connected to the load output through the first rectifier and the first inverter of the main UPS; when the main UPS fails, a first bypass switch of the main UPS is opened, the main UPS is switched to a bypass mode, the commercial power is connected to the load output through a second rectifier and a second inverter of the standby UPS and then connected to the load output through the first bypass switch of the main UPS, and at the moment, the standby UPS starts to work with a load;
when the mains supply is disconnected, the lithium battery system outputs direct current, and the direct current is connected to load output through a first inverter of the main UPS; when the main UPS fails, the first bypass switch of the main UPS is turned on to switch to a bypass mode, the lithium battery system outputs direct current to pass through the second inverter of the standby UPS and then is connected to load output through the first bypass switch of the main UPS, and the standby UPS starts to work with load at the moment.
The hot backup connection mode of the UPS can be divided into series connection and parallel connection, and the lithium battery power supply system provided by the embodiment supplies power to the hot backup UPS connected in series. The main UPS and the standby UPS are connected in series, namely, the inversion output of the standby UPS is connected to a Bypass (Bypass) of the main UPS
As shown in fig. 2, the lithium battery system of the present embodiment includes a two-way power supply output circuit (also referred to as two-way power circuit) and a two-way communication signal output circuit (also referred to as two-way communication circuit), wherein, in the two-way power supply output loop, the positive and negative electrodes of the Battery pack are respectively connected to the positive and negative electrodes (namely connected to the screw hole 101 at the B + end and the screw hole 102 at the B-end) of a Battery Management System (BMS), two groups of power outputs are led out from the P + end and the P-end, which can supply power to the main UPS or the standby UPS and are used as the Battery input of the UPS, namely, the power output positive end and the power output negative end of the battery pack are respectively connected with the main UPS and the standby UPS, the power output positive end of the battery pack is directly connected with the positive electrode of the battery pack, and an MOS (metal oxide semiconductor) switch is arranged between the power output negative end of the battery pack and the negative electrode of the battery pack to realize the on-off control of a main loop; when the commercial power is disconnected, if the main UPS works normally, the lithium battery system supplies power to the main UPS; when the main UPS fails, the lithium battery system supplies power to the standby UPS.
In the two-way communication signal output circuit, the microcontroller MCU of the BMS provides two-way communication signal output, and an optical coupling chip is used for isolating the communication circuit between the UPS and the lithium battery system. The lithium battery system can communicate with the two UPSs simultaneously, and when the main UPS fails, the communication with the standby UPS is still maintained.
As shown in fig. 3, the lithium battery system of this embodiment includes a B + terminal screw hole 101, a B-terminal screw hole 102, a P + terminal screw hole 103, and a P-terminal screw hole 104, wherein an anode of the battery pack is connected to the B + terminal screw hole 101 through a wire, a cathode of the battery pack is connected to the B-terminal screw hole 102 through a wire, a positive power output terminal of the battery pack is connected to the P + terminal screw hole 103, a negative power output terminal of the battery pack is connected to the P-terminal screw hole 104, the P + terminal screw hole 103 is connected to an anode of a connection terminal, the P-terminal screw hole 104 is connected to a cathode of the connection terminal, and then the two output ports are divided into two parallel output ports through a one-to-two connection line to be respectively connected to a battery input of the main UPS and a battery input of the standby UPS.
As shown in fig. 3, the lithium battery system in this example further includes a current detection unit 105, a discharge control unit 106, and a charge control unit 107, the B-terminal screw hole 102 is connected to the discharge control unit 106 through the current detection unit 105, the discharge control unit 106 is connected to the P-terminal screw hole 104 through the charge control unit 107, and the discharge control unit 106 controls the opening and closing of a discharge MOS transistor by receiving a control signal of an MCU, so as to enable or disable discharge; the charging control unit 107 controls the charging MOS transistor to be turned on or off by receiving the control signal of the MCU, thereby enabling or disabling the charging.
The current detection unit 105 is used for measuring the voltage at two ends of the current sampling resistor, and according to ohm's law, the voltage is divided by the resistor to obtain the sampling current of the main loop; the discharge control unit 106 gives a control signal through the microcontroller MCU, and turns on and off the discharge MOS to enable or disable discharge; the charging control unit 107 enables or disables charging by turning on and off the charging MOS through the MCU given control signals.
The present embodiment further includes a communication circuit, where the communication circuit includes an MCU, as shown in fig. 4, the main UPS and the standby UPS are connected to the lithium battery system through the MCU of the communication circuit to implement communication, and the two paths of communication signals are independently output to form a two-path communication signal output circuit.
As shown in fig. 4, 3.3V is preferably adopted to supply power to the MCU, the model of the MCU is preferably STM32L071VB, and the MCU is a 32-bit microcontroller of ST corporation, and can take power from commercial power or a battery; the crystal oscillator clock unit 401 adopts an 8M clock crystal oscillator as a clock source of the MCU; the power-on RESET unit 402 is connected to the NRST asynchronous RESET pin of the MCU, and is configured to power on RESET the MCU, and when the RESET pin is low, the MCU is in a RESET state, and all internal registers and the SRAM memory in the chip are RESET; the serial port communication peripheral USART1 of the MCU is used for the IO ports PA9 and PA10 corresponding to the transmit data pin (MCU _ 232T) and the receive data pin (MCU _ 232R) of the first communication signal transceiving port 403, and may be configured by software, and communication with the main UPS may be performed after configuration is completed; the transmitting data pin (UART 2_ TX) and the receiving data pin (UART 2_ RX) of the second communication signal transceiving port 404 correspond to the IO ports PD5 and PD6, and a serial port communication peripheral USART2 using an MCU, similar to the first communication signal transceiving port 403, is used for communication with the standby UPS and is independent of the first communication signal transceiving port 403, and the present embodiment further includes a plurality of MCU power supply units 405.
As shown in fig. 5, the communication circuit in this example includes a first communication signal optical coupling and isolation module 2, where the first communication signal optical coupling and isolation module 2 further includes a first communication transmission signal optical coupling and isolation unit 201, a first communication reception signal optical coupling and isolation unit 202, and a first transient voltage suppression unit 203, where the first communication transmission signal optical coupling and isolation unit 201 and the first communication reception signal optical coupling and isolation unit 202 are respectively connected to the first transient voltage suppression unit 203, and the first communication reception signal optical coupling and isolation unit 202 and the first communication transmission signal optical coupling and isolation unit 201 are respectively connected to a first communication signal transceiving port 403 of the MCU; the first communication sending signal optical coupling isolation unit 201 and the first communication receiving signal optical coupling isolation unit 202 achieve transmission of serial communication signals through an optical isolation chip.
Because the lithium battery system and the UPS are not grounded together, the first communication signal optical coupling isolation module 2 selects an optical coupling isolation chip to transmit a serial port communication signal; the first transient voltage suppression unit 203 adopts 4 transient voltage suppression diodes to protect the circuit, and when the transient voltage of the communication loop is too high, the transient voltage suppression diodes open the shunt, so as to realize the protection function.
More specifically, in this embodiment, the first transient voltage suppression unit 203 includes a first transient voltage suppression diode, a second transient voltage suppression diode, a third transient voltage suppression diode and a fourth transient voltage suppression diode, cathodes of the first transient voltage suppression diode and the second transient voltage suppression diode are respectively connected to the connection terminal, an anode of the third transient voltage suppression diode is connected to an anode of the first transient voltage suppression diode, an anode of the fourth transient voltage suppression diode is connected to an anode of the second transient voltage suppression diode, a cathode of the third transient voltage suppression diode and a cathode of the fourth transient voltage suppression diode are both connected to grounding terminals of the first communication transmission signal optically-coupled isolation unit 201 and the first communication reception signal optically-coupled isolation unit 202; when the transient voltage of the communication loop where the communication circuit is located is too high, the first transient voltage suppression unit 203 is used for realizing shunting.
As shown in fig. 6, the communication circuit of this embodiment further includes a second communication signal optical coupling and isolation module 3, where the second communication signal optical coupling and isolation module 3 includes a second communication transmission signal optical coupling and isolation unit 301, a second communication reception signal optical coupling and isolation unit 302, and a second transient voltage suppression unit 303, the second communication transmission signal optical coupling and isolation unit 301 and the second communication reception signal optical coupling and isolation unit 302 are respectively connected to the second transient voltage suppression unit 303, and the second communication reception signal optical coupling and isolation unit 302 and the second communication transmission signal optical coupling and isolation unit 301 are respectively connected to a second communication signal transceiving port 404 of the MCU; the second communication sending signal optical coupling isolation unit 301 and the second communication receiving signal optical coupling isolation unit 302 both realize the transmission of serial communication signals through an optical isolation chip.
Similarly, since the lithium battery system and the UPS are not grounded together, the second communication signal optical coupling and isolation module 3 of this embodiment selects an optical coupling and isolation chip to transmit the serial communication signal; the second transient voltage suppression unit 303 uses 4 transient voltage suppression diodes to protect the circuit, and when the transient voltage of the communication loop is too high, the transient voltage suppression diodes open the shunt, thereby implementing the protection function.
More specifically, the second transient voltage suppression unit 303 includes a fifth transient voltage suppression diode, a sixth transient voltage suppression diode, a seventh transient voltage suppression diode, and an eighth transient voltage suppression diode, cathodes of the fifth transient voltage suppression diode and the sixth transient voltage suppression diode are respectively connected to a connection terminal, an anode of the seventh transient voltage suppression diode is connected to an anode of the fifth transient voltage suppression diode, an anode of the eighth transient voltage suppression diode is connected to an anode of the sixth transient voltage suppression diode, a cathode of the seventh transient voltage suppression diode and a cathode of the eighth transient voltage suppression diode are both connected to grounding terminals of the second communication transmission signal opto-coupling isolation unit 301 and the second communication reception signal opto-coupling isolation unit 302; when the transient voltage of the communication loop where the communication circuit is located is too high, the second transient voltage suppression unit 303 is used for realizing shunting.
The communication protocol between the UPS and the lithium battery comprises the code of the UPS: and the UPS _ ID, in consideration of code consistency, the two UPSs burn the same codes, and the UPS _ IDs sent to the lithium battery system by the two UPSs are the same, so that the MCU of the lithium battery system BMS cannot judge which UPS sends the received data, and cannot judge whether the data should be sent to the main UPS from a USART1 serial port or the data should be sent to the standby UPS from a USART2 serial port.
Therefore, in this embodiment, the serial ID of the serial port data of the standby UPS received by the serial port of the lithium battery system is increased by 1, then the current serial ID is determined, and if the received serial port is the default serial ID, the serial port of the USART1 corresponding to the primary UPS is used to send data to the outside; and if the received serial port is the serial port ID added with 1, using the USATR2 serial port corresponding to the standby UPS to send data outwards.
Compared with a lead-acid battery, the lithium battery adopted in the embodiment needs to monitor the state of the lithium battery in real time when in use, and the lithium battery system needs to exchange data with the UPS, for example, the UPS is informed to provide proper charging current, the UPS is shut down in time at low voltage, and the like, so that abnormal conditions such as overcharge, overdischarge, overcurrent and the like in the process of using the lithium battery by the UPS are prevented, and fire and even explosion are avoided. Meanwhile, stable communication needs to be ensured, and two paths of signals are output independently and do not interfere with each other.
In practical application, the communication mode between the lithium battery system and the UPS may be changed from serial communication to 485 communication or CAN communication.
In summary, the present embodiment designs the lithium battery system, so that the lithium battery power supply system includes two battery power circuits and two communication circuits, and on the basis of power supply of the hot backup UPS, the lithium battery system can communicate with the main UPS and the backup UPS at the same time, and when the main UPS fails, communication with the backup UPS is still maintained, thereby achieving the effect of simultaneously supplying power to two serially connected hot backup UPSs and performing mutual communication; on the basis, through the design of the communication circuit, the two paths of communication loops are not interfered with each other and have a protection function, and the reliability and the stability of the lithium battery power supply system are further improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A lithium battery power system for powering a serial hot backup ups, comprising: the dual-channel power supply system comprises a lithium battery system, a dual-channel power supply output circuit and a dual-channel communication signal output circuit, wherein the lithium battery system is respectively connected with a main UPS and a standby UPS, the main UPS comprises a first rectifier, a first inverter and a first bypass switch, the standby UPS comprises a second rectifier, a second inverter and a second bypass switch, a mains supply is connected to the first inverter through the first rectifier, the first inverter is connected to a load, the second rectifier is connected to the first bypass switch through the second inverter, the first bypass switch is connected to the load, and the second bypass switch is connected with the mains supply;
when the UPS works normally, the commercial power is connected to the load output through the first rectifier and the first inverter of the main UPS; when the main UPS fails, a first bypass switch of the main UPS is opened, the main UPS is switched to a bypass mode, the commercial power is connected to the load output through a second rectifier and a second inverter of the standby UPS and then connected to the load output through the first bypass switch of the main UPS, and at the moment, the standby UPS starts to work with a load;
when the mains supply is disconnected, the lithium battery system outputs direct current, and the direct current is connected to load output through a first inverter of the main UPS; when the main UPS fails, the first bypass switch of the main UPS is turned on to switch to a bypass mode, the lithium battery system outputs direct current to pass through the second inverter of the standby UPS and then is connected to load output through the first bypass switch of the main UPS, and the standby UPS starts to work with load at the moment.
2. The lithium battery power supply system for supplying power to the series hot backup uninterruptible power supply of claim 1, wherein the lithium battery system employs the dual-path power supply output loop, positive and negative poles of a battery pack are respectively connected to positive and negative poles of a battery management system, a positive power output terminal and a negative power output terminal of the battery pack are respectively connected to the primary UPS and the backup UPS, the positive power output terminal of the battery pack is directly connected to the positive pole of the battery pack, and an MOS switch is disposed between the negative power output terminal of the battery pack and the negative pole of the battery pack to realize on-off control of the primary loop; when the commercial power is disconnected, if the main UPS works normally, the lithium battery system supplies power to the main UPS; when the main UPS fails, the lithium battery system supplies power to the standby UPS.
3. The lithium battery power supply system for powering a serial hot backup ups as claimed in claim 2, it is characterized in that the lithium battery system comprises a B + end screw hole, a B-end screw hole, a P + end screw hole and a P-end screw hole, the positive pole of the battery pack is connected to the B + end screw hole through a lead, the negative pole of the battery pack is connected to the B-end screw hole through a lead, the positive power output end of the battery pack is connected to the P + end screw hole, the negative power output end of the battery pack is connected to the P-end screw hole, the P + end screw hole is connected to the positive pole of the connecting terminal, the P-end screw hole is connected to the negative pole of the connecting terminal, and then the UPS is divided into two parallel output ports through a one-to-two connecting line so as to be respectively connected to the battery input of the main UPS and the battery input of the standby UPS.
4. The lithium battery power supply system for supplying power to the series hot backup uninterruptible power supply of claim 3, wherein the lithium battery system further comprises a current detection unit, a discharge control unit and a charge control unit, the B-side screw hole is connected to the discharge control unit through the current detection unit, the discharge control unit is connected to the P-side screw hole through the charge control unit, and the discharge control unit controls the opening and closing of a discharge MOS (metal oxide semiconductor) tube by receiving a control signal of the MCU, thereby enabling or disabling discharge; the charging control unit realizes the on-off control of the charging MOS tube by receiving the control signal of the MCU, and further realizes the charging of enabling or disabling.
5. The lithium battery power supply system for supplying power to the serial hot backup uninterruptible power supply according to any one of claims 1 to 4, further comprising a communication circuit, wherein the communication circuit comprises an MCU, the main UPS and the standby UPS are respectively connected to the lithium battery system through the MCU of the communication circuit to realize communication, and the two paths of communication signals are respectively and independently output to form a two-path communication signal output loop.
6. The lithium battery power supply system for supplying power to the series hot standby uninterruptible power supply of claim 5, wherein the communication circuit further comprises a first communication signal optical coupling isolation module, the first communication signal optical coupling isolation module comprises a first communication transmission signal optical coupling isolation unit, a first communication reception signal optical coupling isolation unit and a first transient voltage suppression unit, the first communication transmission signal optical coupling isolation unit and the first communication reception signal optical coupling isolation unit are respectively connected with the first transient voltage suppression unit, and the first communication reception signal optical coupling isolation unit and the first communication transmission signal optical coupling isolation unit are respectively connected with a first communication signal transceiving port of the MCU; the first communication sending signal optical coupling isolation unit and the first communication receiving signal optical coupling isolation unit achieve transmission of serial communication signals through the optical isolation chip.
7. The lithium battery power supply system for powering a serial hot backup ups as claimed in claim 6, wherein the first transient voltage suppression unit comprises a first transient voltage suppression diode, a second transient voltage suppression diode, a third transient voltage suppression diode and a fourth transient voltage suppression diode, the cathodes of the first transient voltage suppression diode and the second transient voltage suppression diode are respectively connected to a connecting terminal, the anode of the third transient voltage suppressor diode is connected to the anode of the first transient voltage suppressor diode, an anode of the fourth TVS diode is connected to an anode of the second TVS diode, the negative electrode of the third transient voltage suppression diode and the negative electrode of the fourth transient voltage suppression diode are both connected to the grounding ends of the first communication sending signal optical coupling isolation unit and the first communication receiving signal optical coupling isolation unit; when the transient voltage of a communication loop where the communication circuit is located is too high, shunting is achieved through the first transient voltage suppression unit.
8. The system of claim 5, wherein the communication circuit further comprises a second communication signal optical coupling isolation module, the second communication signal optical coupling isolation module comprises a second communication transmission signal optical coupling isolation unit, a second communication reception signal optical coupling isolation unit and a second transient voltage suppression unit, the second communication transmission signal optical coupling isolation unit and the second communication reception signal optical coupling isolation unit are respectively connected to the second transient voltage suppression unit, and the second communication reception signal optical coupling isolation unit and the second communication transmission signal optical coupling isolation unit are respectively connected to a second communication signal transceiving port of the MCU; and the second communication sending signal optical coupling isolation unit and the second communication receiving signal optical coupling isolation unit realize the transmission of serial communication signals through the optical isolation chip.
9. The lithium battery power supply system for powering a series hot backup ups as claimed in claim 8, wherein the second transient voltage suppression unit includes a fifth transient voltage suppression diode, a sixth transient voltage suppression diode, a seventh transient voltage suppression diode, and an eighth transient voltage suppression diode, cathodes of the fifth transient voltage suppression diode and the sixth transient voltage suppression diode are respectively connected to a connection terminal, an anode of the seventh transient voltage suppression diode is connected to an anode of the fifth transient voltage suppression diode, an anode of the eighth tvs is connected to an anode of the sixth tvs, the negative electrode of the seventh transient voltage suppression diode and the negative electrode of the eighth transient voltage suppression diode are both connected to the grounding ends of the second communication sending signal optical coupling isolation unit and the second communication receiving signal optical coupling isolation unit; when the transient voltage of a communication loop where the communication circuit is located is too high, shunting is achieved through the second transient voltage suppression unit.
10. The lithium battery power supply system for supplying power to the serial hot backup uninterruptible power supply as claimed in claim 5, wherein the serial ID of the serial data of the standby UPS received by the serial port of the lithium battery system is added by 1, then the current serial ID is determined, and if the received serial ID is the default serial ID, the serial corresponding to the primary UPS is used to send data to the outside; and if the received serial port is the serial port ID added with 1, using the serial port corresponding to the standby UPS to send data outwards.
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