CN109861382B - Power supply system capable of preventing surge voltage from impacting - Google Patents

Power supply system capable of preventing surge voltage from impacting Download PDF

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Publication number
CN109861382B
CN109861382B CN201910267823.3A CN201910267823A CN109861382B CN 109861382 B CN109861382 B CN 109861382B CN 201910267823 A CN201910267823 A CN 201910267823A CN 109861382 B CN109861382 B CN 109861382B
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China
Prior art keywords
power supply
relay
battery pack
lithium battery
node
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CN201910267823.3A
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CN109861382A (en
Inventor
周玉坤
魏亚海
徐权文
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Guangzhou Baoshi New Energy Co ltd
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Guangzhou Baoshi New Energy Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30Systems 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
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S20/00Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20End-user application control systems

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

The invention provides a power supply system for preventing surge voltage impact, which comprises a lithium battery pack, a Battery Management System (BMS), a switching power supply, a control circuit and an Uninterruptible Power Supply (UPS), wherein the lithium battery pack is connected with the UPS through the control circuit; the first end of the switching power supply is connected with a negative circuit of the uninterruptible power supply UPS, and the second end of the switching power supply is connected with the control circuit; the battery management system BMS enables the switching power supply to take electricity from the uninterruptible power supply UPS when the uninterruptible power supply UPS charges the lithium battery pack, and takes electricity from the lithium battery pack when the lithium battery pack and the uninterruptible power supply UPS cut off charging instant or cut off discharging. The invention reduces the consumption of the lithium battery pack, protects the switching power supply and avoids the damage of the switching power supply caused by surge voltage generated when the UPS stops outputting or instantaneously cuts off charging and discharging.

Description

Power supply system capable of preventing surge voltage from impacting
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply system capable of preventing surge voltage from impacting.
Background
The uninterrupted power supply UPS is a system device which connects a storage battery with a computer host and converts direct current of the battery into alternating current commercial power through an inverter circuit. The system is mainly used for uninterrupted power supply for a single computer and a computer network system. When the mains supply input is normal, the uninterruptible power supply UPS supplies the mains supply to the load for use, and meanwhile, the uninterruptible power supply UPS also charges the storage battery. When the commercial power is interrupted (accident power failure), the uninterrupted power supply UPS immediately supplies the direct current energy of the battery to the load by a method of switching and converting through the inverter, so that the load continuously maintains normal work for a certain time, and a user can use the time to process the site and shutdown, thereby protecting the software and hardware of the negative computer from being damaged.
The battery management system BMS plays an important role in the battery management system BMS and is used for ensuring that the uninterruptible power supply UPS is powered through mains supply or powered from the lithium battery pack, and timely charges the lithium battery pack when the mains supply is input. The switching power supply is used for converting the direct current voltage of the battery pack or the uninterruptible power supply UPS into 24V voltage to supply power for the battery management system BMS, so that the switching power supply needs to be ensured to be in a normal working state at any moment.
In the existing switching power supply, in order to prevent the switching power supply from being cut off to cause system breakdown when the uninterrupted power supply UPS stops outputting (such as accident power failure), lithium batteries are adopted to carry out internal power supply, so that the lithium batteries are easy to be damaged; if accident power failure happens suddenly, the shortage of the lithium battery can also cause the damage of software and hardware of the computer. Moreover, if the uninterruptible power supply UPS is used to supply power to the switching power supply, when the UPS suddenly stops charging or discharging, the high voltage generated instantaneously by the UPS easily breaks down the devices of the switching power supply, resulting in damage.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a power supply system for preventing surge voltage from impacting, when an uninterruptible power supply UPS charges a lithium battery pack, a switching power supply takes power from the uninterruptible power supply UPS; when the lithium battery pack and the uninterruptible power supply UPS cut off charging instant or cut off discharging, the switching power supply takes electricity from the lithium battery pack, so that consumption of the lithium battery pack is reduced, and the switching power supply is protected.
The technical scheme of the invention is realized as follows: the power supply system for preventing surge voltage impact comprises a lithium battery pack, a battery management system BMS, a switch power supply, a control circuit and an uninterruptible power supply UPS, wherein the lithium battery pack is connected with the uninterruptible power supply UPS circuit through the control circuit; the first end of the switching power supply is connected with a negative circuit of the uninterruptible power supply UPS, and the second end of the switching power supply is connected with the control circuit; the battery management system BMS causes, by controlling the control circuit:
when the uninterruptible power supply UPS charges the lithium battery pack, the switching power supply takes electricity from the uninterruptible power supply UPS;
when the lithium battery pack and the uninterruptible power supply UPS cut off charging instant or cut off discharging, the switch power supply takes electricity from the lithium battery pack.
Optionally, the control circuit includes a main positive relay S1, a charging relay S2, a wake-up button S3, a DC internal relay S4, a DC external relay S5, a discharging diode, a freewheeling diode D1 and a freewheeling diode D2, wherein a negative electrode of the discharging diode, a positive electrode of the freewheeling diode D2 and one end of the charging relay S2 are collected at a first node a, and the first node a is connected with a positive circuit of the uninterruptible power supply UPS; the other end of the charging relay S2 and the positive electrode of the discharging diode are gathered at a second node b, and the second node b is in circuit connection with the first end of the total positive relay S1; the second end of the total positive relay S1 and the positive electrode of the follow current diode D1 are gathered and connected with a third node c, and the third node c is connected with a positive electrode circuit of the lithium battery pack; the negative electrode of the follow current diode D1, the first end of the wake-up key S3 and the first end of the DC internal relay S4 are collected at a fourth node D, the second end of the wake-up key S3, the second end of the DC internal relay S4 and the first end of the DC external relay S5 are collected at a fifth node e, the fifth node e is in circuit connection with the second end of the switching power supply, and the first end of the switching power supply, the negative electrode of the lithium battery pack and the negative electrode of the uninterruptible power supply UPS are collected at a sixth node f; the DC external relay S5 is connected with the negative electrode circuit of the freewheel diode D2; the closing of the total positive relay S1, the charging relay S2, the DC internal relay S4 and the DC external relay S5 is controlled by the battery management system BMS.
Optionally, a free switch S6 is connected between the fifth node e and the switching power supply.
Optionally, a current divider is connected between the third node c and the lithium battery pack in a circuit manner.
Optionally, a fuse FU1 is connected between the switching power supply and the sixth node f, and a fuse FU2 is connected between the negative electrode of the lithium battery pack and the sixth node f.
Optionally, the battery management system BMS controls the total positive relay S1, the charging relay S2, the DC internal relay S4, and the DC external relay S5 as follows:
when the uninterruptible power supply UPS charges the lithium battery pack or the lithium battery pack discharges the uninterruptible power supply UPS, the battery management system BMS closes the total positive relay S1, the charging relay S2 and the DC external relay S5 and opens the DC internal relay S4;
when the lithium battery pack is charged and overvoltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS for charging, the battery management system BMS closes the total positive relay S1 and the DC internal relay S4, and opens the charging relay S2 and the DC external relay S5;
when the lithium battery pack discharges under-voltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS, the battery management system BMS closes the DC internal relay S4 and opens the total positive relay S1, the charging relay S2 and the DC external relay S5.
Compared with the prior art, the invention has the following advantages: according to the invention, the battery management system BMS controls the control circuit, so that the switching power supply can take electricity from the uninterruptible power supply UPS when the uninterruptible power supply UPS charges the lithium battery pack, and the switching power supply can take electricity from the lithium battery pack when the lithium battery pack and the uninterruptible power supply UPS cut off charging or cut off discharging, thereby reducing consumption of the lithium battery pack, protecting the switching power supply, and avoiding the damage of the switching power supply due to surge voltage generated when the UPS stops outputting or cuts off charging and discharging instantaneously.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a system block diagram of one embodiment of a surge voltage surge protection power supply system of the present invention;
fig. 2 is a circuit configuration diagram of an embodiment of a surge voltage surge protection power supply system according to the present invention.
The attached drawings are identified: a first node; b a second node; c a third node; d, a fourth node; e a fifth node; and f, a sixth node.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
As shown in fig. 1 and fig. 2, the power supply system capable of preventing surge voltage from being impacted comprises a lithium battery pack, a Battery Management System (BMS), a switching power supply, a control circuit and an Uninterruptible Power Supply (UPS), wherein the lithium battery pack is connected with the UPS circuit through the control circuit; the first end of the switching power supply is connected with the negative circuit of the uninterrupted power supply UPS, and the second end of the switching power supply is connected with the control circuit; the battery management system BMS causes, by controlling the control circuit:
when the uninterruptible power supply UPS charges the lithium battery pack, the switching power supply takes electricity from the uninterruptible power supply UPS;
when the lithium battery pack and the uninterruptible power supply UPS cut off charging instant or cut off discharging, the switch power supply takes electricity from the lithium battery pack.
Specifically, as shown in fig. 2, the control circuit includes a total positive relay S1, a charging relay S2, a wake-up button S3, a DC internal relay S4, a DC external relay S5, a discharging diode, a freewheeling diode D1 and a freewheeling diode D2, wherein the negative electrode of the discharging diode, the positive electrode of the freewheeling diode D2 and one end of the charging relay S2 are collected at a first node a, and the first node a is connected with the positive circuit of the uninterruptible power supply UPS; the other end of the charging relay S2 and the positive electrode of the discharging diode are gathered at a second node b, and the second node b is in circuit connection with the first end of the total positive relay S1; the second end of the total positive relay S1 and the positive electrode of the follow current diode D1 are gathered and connected with a third node c, and the third node c is connected with a positive electrode circuit of the lithium battery pack; the negative electrode of the follow current diode D1, the first end of the wake-up key S3 and the first end of the DC internal relay S4 are collected at a fourth node D, the second end of the wake-up key S3, the second end of the DC internal relay S4 and the first end of the DC external relay S5 are collected at a fifth node e, the fifth node e is in circuit connection with the second end of the switching power supply, and the first end of the switching power supply, the negative electrode of the lithium battery pack and the negative electrode of the uninterruptible power supply UPS are collected at a sixth node f; the DC external relay S5 is connected with the negative electrode circuit of the freewheel diode D2; the closing of the total positive relay S1, the charging relay S2, the DC internal relay S4 and the DC external relay S5 is controlled by the battery management system BMS.
The fifth node e is electrically connected with the switch power supply, and the switch power supply system of the invention is used for switching on the switch power supply.
In addition, the wake-up button S3 is a non-self-locking button, and is opened in a default state, and is closed only by manual pressing, and is opened after the manual releasing.
Specifically, the battery management system BMS controls the total positive relay S1, the charging relay S2, the DC internal relay S4, and the DC external relay S5 as follows:
when the uninterruptible power supply UPS charges the lithium battery pack or the lithium battery pack discharges the uninterruptible power supply UPS, the battery management system BMS closes the total positive relay S1, the charging relay S2 and the DC external relay S5 and opens the DC internal relay S4;
when the lithium battery pack is charged and overvoltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS for charging, the battery management system BMS closes the total positive relay S1 and the DC internal relay S4, and opens the charging relay S2 and the DC external relay S5;
when the lithium battery pack discharges under-voltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS, the battery management system BMS closes the DC internal relay S4 and opens the total positive relay S1, the charging relay S2 and the DC external relay S5.
As shown in fig. 2, the specific control procedure is:
(1) When the system is in an initial state, the total positive relay S1, the charging relay S2, the wake-up key S3, the DC internal relay S4 and the air switch S6 are in an open state, and the DC external relay S5 is a normally closed relay and is in a closed state;
(2) When the power supply system of the invention needs to be started, the air switch S6 is manually closed;
(3) When the system is not electrified and the uninterruptible power supply UPS has no voltage output, the wake-up key S3 is manually pressed, the system enters a self-checking state (namely an initialization state), the battery management system BMS controls the total positive relay S1, the charging relay S2 and the DC external relay S5 to be closed and opens the DC internal relay S4, at the moment, the switching power supply takes electricity from the lithium battery pack, two paths of currents enter the switching power supply, and the current directions are respectively as follows: b+ & gt, a total positive relay S1, a charging relay S2, a freewheeling diode D2, a DC external relay S5, a switching power supply, B-, B+ & gt, a freewheeling diode D1, a wake-up key S3, a switching power supply and B-, so as to detect whether each device in a control circuit is damaged;
when the wake-up key S3 is released, the current direction becomes: b+ & gt, a total positive relay S1, a charging relay S2, a freewheeling diode D2, a DC external relay S5, a switching power supply and B-;
thereby detecting whether the device in the control circuit is in a normal working state.
(4) When the system is not electrified and the uninterruptible power supply UPS has voltage output, the system is in a self-checking state again, the battery management system BMS controls the total positive relay S1, the charging relay S2 and the DC external relay S5 to be closed, the DC internal relay S4 is disconnected, the wake-up key S3 is in a disconnected state, at the moment, the switching power supply is powered from the uninterruptible power supply UPS, and the current direction is as follows: p+ to a freewheeling diode D2 to a DC external relay S5 to a switching power supply to P-, so as to detect whether each device in the control circuit is in a normal working state;
(5) When the uninterruptible power supply charges the lithium battery pack, the battery management system BMS controls the total positive relay S1, the charging relay S2 and the DC external relay S5 to be closed and disconnect the DC internal relay S4, and the wake-up key S3 is in an off state, at the moment, the switching power supply takes electricity from the uninterruptible power supply UPS, and the current direction is as follows: p+ & gt, a freewheeling diode D2, a DC external relay S5, a switching power supply and P-;
(6) When the lithium battery is charged and overvoltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS for charging connection, at the moment, the battery management system BMS controls the total positive relay S1 and the DC internal relay S4 to be closed, the charging relay S2 and the DC external relay S5 are disconnected, the wake-up key S3 is in a disconnected state, at the moment, the switching power supply is changed to take electricity from the lithium battery pack, the situation that the lithium battery pack and the UPS break off and charge, and the high voltage generated by the positive pole P+ of the uninterruptible power supply UPS breaks down the switching power supply device is avoided, and at the moment, the current direction is changed to be: b+ & gt, a freewheeling diode D1, a DC internal relay S4, a switching power supply and B-;
(7) When the lithium battery pack discharges to the uninterruptible power supply UPS, the battery management system BMS controls the total positive relay S1, the charging relay S2 and the DC external relay S5 to be closed, the wake-up key S3 is in an open state, and the DC internal relay S4 is disconnected, at the moment, the switching power supply takes electricity from the lithium battery pack, and the current direction is as follows: b+ & gt, a total positive relay S1, a charging relay S2, a freewheeling diode D2, a DC external relay S5, a switching power supply and B-;
(8) When the lithium battery pack discharges under-voltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS, the battery management system BMS controls the DC internal relay S4 to be closed, the total positive relay S1, the charging relay S2 and the DC external relay S5 are disconnected, the awakening key S3 is in an off state, at the moment, the switching power supply takes electricity from the lithium battery pack, and the current direction is changed into: b+ & gt, a freewheeling diode D1, a DC internal relay S4, a switching power supply and B-; because the total positive relay S1 and the charging relay S2 are both disconnected at this time, the uninterruptible power supply UPS cannot take electricity from the lithium battery pack.
In the control process, the discharging diode, the freewheel diode D1 and the freewheel diode D2 can only flow unidirectionally, and the stability of the voltage of the lithium battery pack is combined, so that the switching power supply is prevented from being damaged by surge voltage instantaneously generated by the uninterrupted power supply UPS.
In the above embodiment, a current divider is electrically connected between the third node c and the lithium battery pack, and is used for detecting the magnitude and direction of the current, so that the battery management system BMS calculates the magnitude of the capacity of the lithium battery pack.
The fuse FU1 is connected between the switching power supply and the sixth node f, and the fuse FU2 is connected between the negative electrode of the lithium battery pack and the sixth node f, so as to protect the loop.
According to the invention, the battery management system BMS controls the control circuit, so that the switching power supply can take electricity from the uninterruptible power supply UPS when the uninterruptible power supply UPS charges the lithium battery pack, and the switching power supply can take electricity from the lithium battery pack when the lithium battery pack and the uninterruptible power supply UPS cut off charging or cut off discharging, thereby reducing consumption of the lithium battery, protecting the switching power supply, and avoiding the damage of the switching power supply due to surge voltage generated when the uninterruptible power supply UPS stops outputting or cuts off charging and discharging instantaneously.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (3)

1. The power supply system for preventing surge voltage impact is characterized by comprising a lithium battery pack, a battery management system BMS, a switching power supply, a control circuit and an uninterruptible power supply UPS, wherein the lithium battery pack is connected with the uninterruptible power supply UPS through the control circuit; the first end of the switching power supply is connected with a negative circuit of the uninterruptible power supply UPS, and the second end of the switching power supply is connected with the control circuit; the battery management system BMS causes, by controlling the control circuit:
when the uninterruptible power supply UPS charges the lithium battery pack, the switching power supply takes electricity from the uninterruptible power supply UPS;
when the lithium battery pack and the uninterruptible power supply UPS cut off charging instant or cut off discharging, the switching power supply takes electricity from the lithium battery pack;
the control circuit comprises a total positive relay S1, a charging relay S2, a wake-up key S3, a DC internal relay S4, a DC external relay S5, a discharge diode, a freewheel diode D1 and a freewheel diode D2, wherein the negative electrode of the discharge diode, the positive electrode of the freewheel diode D2 and one end of the charging relay S2 are collected at a first node a, and the first node a is connected with a positive circuit of an uninterruptible power supply UPS; the other end of the charging relay S2 and the positive electrode of the discharging diode are gathered at a second node b, and the second node b is in circuit connection with the first end of the total positive relay S1; the second end of the total positive relay S1 and the positive electrode of the follow current diode D1 are gathered in a third node c, and the third node c is connected with a positive electrode circuit of the lithium battery pack; the negative electrode of the follow current diode D1, the first end of the wake-up key S3 and the first end of the DC internal relay S4 are collected at a fourth node D, the second end of the wake-up key S3, the second end of the DC internal relay S4 and the first end of the DC external relay S5 are collected at a fifth node e, the fifth node e is in circuit connection with the second end of the switching power supply, and the first end of the switching power supply, the negative electrode of the lithium battery pack and the negative electrode of the uninterruptible power supply UPS are collected at a sixth node f; the DC external relay S5 is connected with the negative electrode circuit of the freewheel diode D2; the closing of the total positive relay S1, the charging relay S2, the DC internal relay S4 and the DC external relay S5 is controlled by a battery management system BMS;
an idle switch S6 is connected between the fifth node e and the switching power supply in a circuit manner;
and a shunt is connected between the third node c and the lithium battery pack in a circuit manner.
2. The surge voltage surge protection power supply system according to claim 1, wherein a fuse FU1 is connected between the switching power supply and a sixth node f, and a fuse FU2 is connected between a negative electrode of the lithium battery pack and the sixth node f.
3. The surge voltage surge protection power supply system according to claim 1, wherein the battery management system BMS controls the total positive relay S1, the charging relay S2, the DC internal relay S4, and the DC external relay S5 as follows:
when the uninterruptible power supply UPS charges the lithium battery pack or the lithium battery pack discharges the uninterruptible power supply UPS, the battery management system BMS closes the total positive relay S1, the charging relay S2 and the DC external relay S5 and opens the DC internal relay S4;
when the lithium battery pack is charged and overvoltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS for charging, the battery management system BMS closes the total positive relay S1 and the DC internal relay S4, and opens the charging relay S2 and the DC external relay S5;
when the lithium battery pack discharges under-voltage, the lithium battery pack is disconnected with the uninterruptible power supply UPS, the battery management system BMS closes the DC internal relay S4 and opens the total positive relay S1, the charging relay S2 and the DC external relay S5.
CN201910267823.3A 2019-04-03 2019-04-03 Power supply system capable of preventing surge voltage from impacting Active CN109861382B (en)

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CN110429697A (en) * 2019-09-11 2019-11-08 杭州协能科技股份有限公司 Under-voltage protecting circuit and guard method
CN110994781B (en) * 2019-12-28 2024-05-03 广州宝狮新能源有限公司 UPS lithium battery integrated power supply system

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