CN219843447U - Battery charge-discharge control device and uninterruptible power supply system - Google Patents
Battery charge-discharge control device and uninterruptible power supply system Download PDFInfo
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- CN219843447U CN219843447U CN202321016807.5U CN202321016807U CN219843447U CN 219843447 U CN219843447 U CN 219843447U CN 202321016807 U CN202321016807 U CN 202321016807U CN 219843447 U CN219843447 U CN 219843447U
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Abstract
The present disclosure relates to a battery charge and discharge control device and uninterruptible power supply system, the control device includes: the input end of the unidirectional conductive element is connected with the positive electrode of the storage battery, and the output end of the unidirectional conductive element is connected with the positive electrode of the power supply; the first switch element is arranged on a connecting wire between the output end of the unidirectional conductive element and the positive electrode of the power supply to form a first discharge circuit; the second switching element is respectively connected with the anode of the storage battery and the anode of the power supply to form a second discharging circuit; the current conversion element is respectively connected with the power supply and the storage battery to form a charging circuit; and the control unit is respectively connected with the first switch element, the second switch and the current conversion element and used for controlling the on or off of the first discharging circuit, the second discharging circuit and the charging circuit. Therefore, the control unit directly controls the on/off of the charge-discharge circuit, so that the state of charge of the storage battery is prevented from being different.
Description
Technical Field
The disclosure relates to the technical field of storage batteries, in particular to a battery charge and discharge control device and an uninterruptible power supply system.
Background
An uninterruptible power supply (Uninterruptible Power Supply, UPS) system is an uninterruptible power supply that includes an energy storage device. The power supply is mainly used for providing uninterrupted power for equipment with higher requirements on power supply stability.
In the related art, the energy storage device comprises a plurality of groups of storage batteries, each group of storage batteries is connected to the direct current output end of the UPS host of the uninterruptible power supply system through a battery charge and discharge control device, and the UPS host can control any battery charge and discharge control device to control the charge state and discharge state of the storage batteries. When any group of storage batteries reach the full charge or discharge cut-off threshold, the UPS host controls all the storage batteries to stop charging or discharging, so that the charge states of the storage batteries in each group are different.
Disclosure of Invention
In order to solve the problems in the related art, the present disclosure provides a battery charge and discharge control device and an uninterruptible power supply system.
A first aspect of the present disclosure provides a battery charge-discharge control device, including:
the input end of the unidirectional conductive element is used for being connected with the positive electrode of the storage battery, and the output end of the unidirectional conductive element is used for being connected with the positive electrode of the power supply;
a first switching element provided on a connection line between an output end of the unidirectional conductive element and an anode of the power supply to form a first discharge circuit between the storage battery and the power supply in a case where a cathode of the storage battery is connected to the cathode of the power supply;
a second switching element for being connected to the positive electrode of the battery and the positive electrode of the power supply, respectively, to form a second discharge circuit between the battery and the power supply in the case where the negative electrode of the battery is connected to the negative electrode of the power supply;
a current conversion element connected to the power source and the battery, respectively, to form a charging circuit between the battery and the power source;
and the control unit is respectively connected with the first switching element, the second switching element and the current conversion element and used for controlling the on or off of the first discharging circuit, the second discharging circuit and the charging circuit.
Optionally, the current conversion element is a DC-DC converter, an anode input end of the DC-DC converter is connected to an anode of the power supply, an anode output end of the DC-DC converter is connected to an anode of the battery, a cathode input end of the DC-DC converter is connected to a cathode of the power supply, and a cathode output end of the DC-DC converter is connected to a cathode of the battery to form a charging circuit between the battery and the power supply.
Optionally, the DC-DC converter includes:
the input end of the PMW power conversion circuit is connected with the positive electrode of the power supply, and the output end of the PMW power conversion circuit is connected with the positive electrode of the storage battery and is used for carrying out power conversion on the voltage output by the positive electrode of the power supply according to a preset duty ratio and then transmitting the voltage to the positive electrode of the storage battery;
the output end of the PWM control circuit is connected with the control end of the PMW power conversion circuit, the input end of the PWM control circuit is connected with the control end of the control unit, and the PWM control circuit is used for receiving a control signal sent by the control unit so as to control the on-off state of the charging circuit and sending the preset duty ratio to the PMW power conversion circuit.
Optionally, the DC-DC converter further comprises:
the input end of the input filter circuit is connected with the positive electrode of the power supply, and the output end of the input filter circuit is connected with the input end of the PMW power conversion circuit and is used for carrying out filter processing on the voltage output by the power supply and transmitting the voltage to the PMW power conversion circuit;
and the input end of the output filter circuit is connected with the output end of the PMW power conversion circuit, and the output end of the output filter circuit is connected with the positive electrode of the storage battery and is used for carrying out filter processing on the voltage output by the PMW power conversion circuit and transmitting the voltage to the positive electrode of the storage battery.
Optionally, the unidirectional conductive element is a diode, an anode of the diode is used for being connected with a positive electrode of the storage battery, and a cathode of the diode is used for being connected with a positive electrode of the power supply;
the first switching element is arranged on a connecting line between the cathode of the diode and the positive electrode of the power supply.
Optionally, the first switching element and the second switching element are both relays.
Optionally, the first switching element is a normally closed relay.
Optionally, the method further comprises:
and the fuse is respectively connected with the anode of the storage battery and the current conversion element.
Optionally, the method further comprises:
a dc breaker, wherein a first end of a first pair of connection ends of the dc breaker is connected to the first switching element, the second switching element and the current conversion element, respectively, and a second end of the first pair of connection ends is used for being connected to a positive electrode of the power supply;
and a first end of a second pair of connecting ends of the direct current breaker is used for being connected with the negative electrode of the storage battery, and a second end of the second pair of connecting ends is used for being connected with the negative electrode of the power supply.
A second aspect of the present disclosure provides an uninterruptible power supply system comprising:
a power supply;
a plurality of storage batteries;
the battery charge and discharge control devices provided in the first aspect of the present disclosure are each connected to a corresponding one of the storage batteries.
The method has the following beneficial effects:
in the present disclosure, by providing the control unit to connect the first switching element of the first discharging circuit, the second switching element of the second discharging circuit, and the current conversion element of the charging circuit, when the battery charge-discharge control device is connected to the uninterruptible power supply system, the charging state and the discharging state of the storage battery connected to the battery charge-discharge control device may not be controlled by the UPS host, but the first switching element, the second switching element, and the current conversion element may be directly controlled by the control unit included in the UPS host, so as to control on or off of the first discharging circuit, the second discharging circuit, and the charging circuit, so that the battery charge-discharge control device may independently manage the charging state and the discharging state of the storage battery connected to the battery charge-discharge control device. Therefore, the consistency of the battery cells in each group of storage batteries can be ensured, and the condition that the charge states of the storage batteries in each group are different is avoided, so that the storage batteries work in the optimal state.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a schematic configuration diagram of a battery charge and discharge control device shown in the related art.
Fig. 2 is a schematic structural diagram of an uninterruptible power supply system shown in the related art.
Fig. 3 is a schematic diagram showing a structure of a battery charge and discharge control device according to an exemplary embodiment.
Fig. 4 is a schematic diagram of an uninterruptible power supply system, according to an example embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
In the uninterrupted power supply system, when the commercial power input is normal, the UPS host machine stabilizes the commercial power and supplies the commercial power to the load for use, and the uninterrupted power supply system is an alternating current type electric voltage stabilizer and charges a storage battery in the uninterrupted power supply system. When the mains supply is interrupted, such as an accident power failure, the UPS host immediately supplies the direct-current power of the storage battery to the load by a method of inverter conversion, so that the load keeps normal work and soft and hardware of the load are protected from damage. Uninterruptible power supply systems generally provide protection against either over-voltage or under-voltage.
In the related art, there is provided a battery charge and discharge control device, as shown in fig. 1, including:
the discharging circuit comprises a diode D1 and a relay KA1, wherein the anode of the diode D1 is connected with the anode of the storage battery, the cathode of the diode D1 is connected with the input end of the relay KA1, and the output end of the relay KA1 is connected with the anode of the power supply;
the charging circuit comprises a diode D2 and a relay KA2, wherein the input end of the relay KA2 is connected with the positive electrode of the power supply, the output end of the relay KA2 is connected with the anode of the diode D2, and the cathode of the diode D2 is connected with the positive electrode of the storage battery;
the pre-charging circuit comprises a resistor R and a relay KA3, wherein the input end of the relay KA3 is connected with the positive electrode of the power supply, the output end of the relay KA3 is connected with one end of the resistor R, and the other end of the resistor R is connected with the positive electrode of the storage battery;
the negative electrode of the power supply is connected with the negative electrode of the storage battery through a relay KA 4;
and the direct current breaker QF is used for controlling the connection or disconnection of a link between the power supply and the battery charge and discharge control device.
The relay KA1, the relay KA2, the relay KA3 and the relay KA4 are power type relays, and are controlled to be turned on or turned off by a UPS host computer so as to realize the start-stop management of charging and discharging of the storage battery; the diode D1 and the diode D2 are power diodes and are used for cutting off reverse current; the resistor R is a power type resistor and is used as a pre-charging resistor for limiting the peak current generated by the whole loop when the power supply is connected; the direct current breaker QF is used for realizing the integral switch control and short-circuit protection of the battery charge and discharge control device.
As shown in fig. 1 and fig. 2, the battery charge-discharge control devices are connected in series to form a communication link, and any one end of the communication link is in communication connection with an RS485 interface or a dry contact of the UPS host.
Specifically, each group of storage batteries is connected to a direct current interface of an output power supply of the UPS host through a battery charge-discharge control device, and because the communication interface of the UPS host is limited, a communication link is formed between each battery charge-discharge control device and an adjacent battery charge-discharge control device in a manner of serial connection communication by hand, and a control unit of the battery charge-discharge control device positioned at one end of the communication link is in communication connection with an RS485 interface or a dry contact point of the UPS host, and shares a transmission line of the communication link and the communication interface of the UPS host. When any group of storage batteries in the uninterruptible power supply system reach a full charge state or a discharge cut-off threshold, the UPS host controls to close the charging circuits or the discharging circuits of all the storage batteries, and at the moment, other storage batteries which do not reach the full charge state or the discharge cut-off threshold stop charging or discharging.
In practical situations, the charging power and the discharging power of each group of batteries cannot be completely the same in an ideal state, so that the charge states of the storage batteries of each group are different, the difference is further increased after long-term operation, the consistency of the battery cores in the storage batteries is poor, and the utilization rate of the storage batteries is reduced. Meanwhile, the connection mode of serial connection communication of the handles adopted among the battery charge and discharge control devices is that the transmission line of the common communication link and the communication interface of the UPS host machine can cause communication faults of the uninterrupted power supply system due to faults of any point, so that the whole system is stopped, and the risk of failure of the standby power function is increased.
In order to solve the above-mentioned problems, an embodiment of the present disclosure provides a battery charge and discharge control device and an uninterruptible power supply, referring to fig. 3, fig. 3 is a schematic structural diagram of a battery charge and discharge control device according to an exemplary embodiment, including:
the input end of the unidirectional conductive element is used for being connected with the positive electrode of the storage battery, and the output end of the unidirectional conductive element is used for being connected with the positive electrode of the power supply;
a first switching element provided on a connection line between an output end of the unidirectional conductive element and a positive electrode of the power supply to form a first discharge circuit between the battery and the power supply in a case where a negative electrode of the battery is connected to a negative electrode of the power supply;
a second switching element for being connected to the positive electrode of the battery and the positive electrode of the power supply, respectively, to form a second discharge circuit between the battery and the power supply in the case where the negative electrode of the battery is connected to the negative electrode of the power supply;
the current conversion element is respectively connected with the power supply and the storage battery to form a charging circuit between the storage battery and the power supply;
and the control unit is respectively connected with the first switching element, the second switching element and the current conversion element and is used for controlling the on or off of the first discharging circuit, the second discharging circuit and the charging circuit.
The discharge circuit includes a first discharge circuit and a second discharge circuit, and the control unit may control either discharge circuit to be on and the other discharge circuit to be off when the control unit controls the discharge circuits to perform the discharge. The control unit controls the first discharging circuit to be in a conducting state and the second discharging circuit to be in a disconnecting state, and at the moment, the storage battery discharges through the first discharging circuit; or the control unit controls the first discharging circuit to be in an off state and controls the second discharging circuit to be in an on state, and at the moment, the storage battery is discharged through the second discharging circuit.
By way of example, embodiments of the present disclosure may be applied to scenarios of seamless switching or zero switching time of battery charge-discharge states, such as in uninterruptible power supply systems. The control unit controls the on or off of the first discharging circuit, the second discharging circuit and the charging circuit through the first switching element, the second switching element and the current conversion element.
The unidirectional conductive element and the first switching element form, for example, a first discharge circuit between the battery and the power supply, the unidirectional conductive element being configured to block a current flowing from the power supply to the battery in the first discharge circuit, i.e. to prevent the power supply from charging the battery through the first discharge circuit.
For example, in the state of charge, the control unit controls the second switching element to be opened (at this time, the first switching element may not be controlled regardless of whether it is closed) to control the first discharging circuit and the second discharging circuit to be opened, and controls the current converting element to control the charging circuit to be turned on to control the power supply to charge the storage battery through the charging circuit.
For example, in order to achieve seamless switching of the charge-discharge state of the battery, the first switching element is set to a normally closed state and the second switching element is set to a normally open state. Specifically, when the UPS is in a discharging state, the control unit controls the charging circuit to be disconnected, and the storage battery discharges through the first discharging circuit, so that the UPS host converts direct-current electric energy output by the storage battery and supplies power to a load. When the discharging current of the storage battery exceeds a threshold value or the discharging time passing through the first discharging circuit exceeds a preset time, the control unit controls the second switching element to be closed and controls the first switching element to be opened so as to disconnect the first discharging circuit and conduct the second discharging circuit, and at the moment, the storage battery discharges through the second discharging circuit so as to enable the UPS host to supply power to the load after converting the electric energy. In this process, since there may be a certain time difference between the on and off of the first switching element and the second switching element, the first switching element may also be controlled by the control unit to be turned off with a delay, for example, with a delay of 3s, so that seamless switching of the charge and discharge states of the storage battery may be achieved.
In the present disclosure, by providing the control unit to connect the first switching element of the first discharging circuit, the second switching element of the second discharging circuit, and the current conversion element of the charging circuit, when the battery charge-discharge control device is connected to the uninterruptible power supply system, the charging state and the discharging state of the storage battery connected to the battery charge-discharge control device may not be controlled by the UPS host, but the first switching element, the second switching element, and the current conversion element may be directly controlled by the control unit included in the UPS host, so as to control on or off of the first discharging circuit, the second discharging circuit, and the charging circuit, so that the battery charge-discharge control device may independently manage the charging state and the discharging state of the storage battery connected to the battery charge-discharge control device. Therefore, the consistency of the battery cells in each group of storage batteries can be ensured, and the condition that the charge states of the storage batteries in each group are different is avoided, so that the storage batteries work in the optimal state.
In the related art, when the battery charge-discharge control device adopts a communication connection mode of serial connection communication of hand-in-hand, the connection points are more, the wiring is longer, and the wiring is generally in the same pipe groove with the high-voltage alternating-current end of the UPS host machine, so that the communication failure of the UPS system is caused due to the fact that the wiring is easy to be interfered by signals and data loss or errors are caused.
In the disclosure, the control unit is only in communication with the circuit conversion element, so that the communication line is extremely short, communication is completed in the battery charge and discharge control device, external signal interference can be avoided through reasonable wiring design, and communication quality is guaranteed.
In some embodiments, the current conversion element is a DC-DC converter, the positive input of the DC-DC converter is connected to the positive pole of the power supply, the positive output of the DC-DC converter is connected to the positive pole of the battery, the negative input of the DC-DC converter is connected to the negative pole of the power supply, and the negative output of the DC-DC converter is connected to the negative pole of the battery to form a charging circuit between the battery and the power supply.
For example, a DC-DC converter is provided in the charging circuit and connected to a control unit, and the control unit may directly control the DC-DC converter, thereby controlling the on-off state of the charging circuit. In other possible embodiments, the control unit may also control the PWM wave of the DC-DC converter, and control the current output from the DC-DC converter, so as to control the magnitude of the current that the power supply charges the battery.
In an exemplary embodiment, in the charging state, the control unit controls the DC-DC converter of the charging circuit to be in a conducting state, and controls the first discharging circuit and the second discharging circuit to be in a disconnecting state, the UPS host converts the mains supply into DC power, and the DC power is transmitted to the storage battery through the charging circuit via the DC bus of the UPS host. When the mains supply is interrupted, such as an accident power failure, the control unit controls at least one discharging circuit to be in a conducting state, and controls the DC-DC converter of the charging circuit to be in a cutting-off state, the direct-current power of the plurality of groups of storage batteries is transmitted to the direct-current bus of the UPS host through the discharging circuit, and the UPS host switches and converts the direct-current power of the plurality of groups of storage batteries through the inverter to continuously supply alternating-current power to the load.
For example, in uninterruptible power supply systems, the input and output sides of the DC-DC converter need to be electrically isolated, and thus the DC-DC converter may be an isolated DC-DC converter. The isolated DC-DC converter may separate noise sensitive parts of the circuit from noise sources.
In some embodiments, the DC-DC converter includes:
the input end of the PMW power conversion circuit is connected with the positive electrode of the power supply, and the output end of the PMW power conversion circuit is connected with the positive electrode of the storage battery and is used for carrying out power conversion on the voltage output by the positive electrode of the power supply according to a preset duty ratio and then transmitting the voltage to the positive electrode of the storage battery;
the output end of the PWM control circuit is connected with the control end of the PMW power conversion circuit, and the input end of the PWM control circuit is connected with the control end of the control unit and is used for receiving the control signal sent by the control unit so as to control the on-off state of the charging circuit and sending the preset duty ratio to the PMW power conversion circuit.
By way of example, the PMW power conversion circuit adopts an isolation type, which can isolate the storage battery from the dc bus of the UPS host, and can realize independent management of the charge states and discharge states of multiple groups of storage batteries in the uninterruptible power supply system, so that the multiple groups of storage batteries can maintain the optimal capacity. The value of the preset duty ratio can be controlled and regulated by the PWM control circuit according to a preset control strategy, the PMW power conversion circuit carries out power conversion according to the preset duty ratio sent by the PWM control circuit, and the output voltage and the current of the PMW power conversion circuit and the preset duty ratio form a nonlinear relation. The PWM control circuit has monitoring and external communication functions, and is communicated with the control unit of the battery charge-discharge control device through an external communication interface, the control unit monitors the state of the storage battery in real time and can manage the state, when the state of the storage battery such as full charge, faults and the like needs to stop charging or adjust charging power, the control unit can transmit a control instruction for stopping charging or adjusting the charging power to the PWM control circuit through the external communication interface, and the PWM control circuit adjusts a preset duty ratio to realize control for stopping charging or adjusting the charging power.
In some embodiments, the DC-DC converter further comprises:
the input end of the input filter circuit is connected with the positive electrode of the power supply, and the output end of the input filter circuit is connected with the input end of the PMW power conversion circuit and is used for carrying out filter processing on the voltage output by the power supply and transmitting the voltage to the PMW power conversion circuit;
and the input end of the output filter circuit is connected with the output end of the PMW power conversion circuit, and the output end of the output filter circuit is connected with the positive electrode of the storage battery and is used for carrying out filter processing on the voltage output by the PMW power conversion circuit and transmitting the voltage to the positive electrode of the storage battery.
The input filter circuit and the output filter circuit serve as an input end and an output end of the DC-DC converter, filter the electric energy input to the DC-DC converter and the electric energy output to the DC-DC converter, filter interference noise, reduce alternating current part in direct current electric energy as much as possible, keep direct current component of the direct current electric energy, reduce ripple coefficient of output voltage and smooth waveform.
In some embodiments, the unidirectional conductive element is a diode, an anode of the diode is for connection with a positive electrode of the battery, and a cathode of the diode is for connection with a positive electrode of the power supply;
the first switching element is arranged on a connecting line between the cathode of the diode and the positive electrode of the power supply.
Illustratively, the unidirectional conductivity of the diode means that the diode is conducted and has a very low resistance when a forward voltage is applied during normal operation of the diode; when reverse voltage is applied, reverse current is small, and the diode is in a high-blocking state. The diode can be used as a unidirectional conduction switch and can also protect the current, for example, when the reverse voltage across the diode increases to a certain value, the reverse current increases dramatically and the diode will lose unidirectional conduction characteristics, at which point the diode breaks down.
For example, as shown in fig. 1, a plurality of diodes are adopted in the related art, and after the discharge circuit and the charge circuit are turned on, the uninterrupted power supply system has a discharge imbalance risk due to the voltage drop difference between two ends of the diodes. As shown in fig. 3, in the embodiment of the disclosure, the diode is only arranged in the first discharge circuit, when the discharge current is less than or equal to the discharge cut-off threshold, the first discharge circuit is used for discharging, so that the diode is only used when the discharge current is less than or equal to the discharge cut-off threshold, and when the discharge current is greater than the discharge cut-off threshold, the second discharge circuit discharges through the second discharge circuit, at the moment, the second discharge circuit does not have the diode, and no voltage drop difference occurs, so that the impedance consistency of the discharge loops of a plurality of groups of storage batteries can be maintained, and the problem of unbalanced discharge caused by the voltage drop difference of the diodes is avoided.
In some embodiments, the first switching element and the second switching element are both relays.
Illustratively, the relay includes a coil and an armature. In the first switching element, two ends of a coil of the relay K1 are respectively connected with a control end of the control unit, a movable contact of an armature is connected with an output end of the diode D, a static contact of the armature is connected with a positive electrode of a power supply, and the static contact of the relay K1 is a normally closed contact. In the second switching element, two ends of a coil of the relay K2 are respectively connected with a control end of the control unit, a movable contact of the armature is connected with a positive electrode of the storage battery, a static contact of the armature is connected with a positive electrode of the power supply, and the static contact of the relay K2 is a normally open contact.
In some embodiments, the negative electrode of the power supply is connected with the negative electrode of the storage battery through a third switching element K3, the input end of the third switching element K3 is connected with the negative electrode of the power supply, the output end of the third switching element K3 is connected with the negative electrode of the storage battery, and the on and off of the third switching element K3 is controlled by the control unit.
The third switching element K3 is illustratively a negative contactor that remains normally closed, switching to the open state only when the ups system fails severely and the system is disabled.
In some embodiments, the first switching element is a normally closed relay.
For example, the first switching element remains normally closed so that the battery is switched to a discharge state at any time, while the diode may block the current flowing from the dc bus to the battery in the loop in which the first discharge circuit is located, ensuring that the uninterruptible power supply system does not charge the battery through the loop.
In some embodiments, further comprising:
and the fuse is respectively connected with the positive electrode of the storage battery and the current conversion element.
For example, the fuse may be a fuse and may provide short circuit protection for the battery.
In some embodiments, further comprising:
the direct current circuit breaker is characterized in that a first end of a first pair of connecting ends of the direct current circuit breaker is respectively connected with a first switching element, a second switching element and a current conversion element, and a second end of the first pair of connecting ends is used for being connected with a positive electrode of a power supply;
the first end of the second pair of connecting ends of the direct current breaker is used for being connected with the negative electrode of the storage battery, and the second end of the second pair of connecting ends is used for being connected with the negative electrode of the power supply.
For example, the dc circuit breaker may act as an overload protection device for the battery and as a switch between the dc bus controlling the UPS host and the battery.
A second aspect of the present disclosure provides an uninterruptible power supply system comprising:
a power supply;
a plurality of storage batteries;
the battery charge and discharge control devices provided by the embodiments of the present disclosure are multiple, and each battery control device is correspondingly connected with one storage battery.
In an uninterruptible power supply system with large capacity, a plurality of groups of storage batteries are configured by a UPS host machine and connected in parallel to a direct current interface of the UPS host machine, and the number of the storage batteries is determined by comprehensive calculation of the system capacity, the standby time and the capacity of a selected battery unit (module).
As shown in fig. 2, each group of storage batteries is correspondingly provided with a battery charge-discharge control device, two adjacent battery charge-discharge control devices are in series connection communication, and finally the battery charge-discharge control device positioned at one end of the communication link is communicated with the UPS host.
As shown in fig. 4, each battery charge-discharge control device is correspondingly connected with a storage battery, and the on-off states of the charge circuit, the first discharge circuit and the second discharge circuit in the battery charge-discharge control device are controlled by the control unit to control the charge state and the discharge state of the corresponding storage battery.
The uninterruptible power supply system of the present disclosure, as shown in fig. 3 and 4, includes a UPS main unit, a storage battery, a discharging circuit, a charging circuit, a control unit, and a dc breaker.
Wherein the discharge circuit includes:
the first discharging circuit comprises a diode D and a relay K1, wherein the anode of the diode D is connected with the anode of the storage battery, the cathode of the diode D is connected with one end of the relay K1, and the other end of the relay K1 is connected with the anode of the direct current interface of the UPS host.
And the second discharging circuit comprises a relay K2, one end of the relay K2 is connected with the positive electrode of the storage battery, and the other end of the relay K2 is connected with the positive electrode of the direct current interface of the UPS host.
And one end of the relay K3 is connected with the negative electrode of the storage battery, and the other end of the relay K3 is connected with the negative electrode of the direct current interface of the UPS host.
Wherein, the charging circuit includes:
a DC-DC converter and a fuse FU;
the positive electrode input end of the DC-DC converter is connected with the positive electrode of the direct current interface of the UPS host, the positive electrode output end of the DC-DC converter is connected with one end of the fuse, the other end of the fuse FU is connected with the positive electrode of the storage battery, the negative electrode input end of the DC-DC converter is connected with the negative electrode of the direct current interface of the UPS host, and the negative electrode output end of the DC-DC converter is connected with the negative electrode of the storage battery.
The direct current breaker QF is used for controlling the connection or disconnection of a link between the power supply and the battery charge and discharge control device.
Wherein, the UPS host computer includes:
the static switch 1 is an alternating current switch formed by two Silicon Controlled Rectifiers (SCRs) in anti-parallel connection, and the closing and opening of the static switch are controlled by a logic controller in a UPS host.
The rectifier 2 is used for converting alternating current energy input by the mains supply into direct current energy voltage and providing charging voltage for the storage battery.
And the inverter 3 is used for converting the filtered direct current energy provided by the rectifier 2 into alternating current energy and transmitting the alternating current energy to a load to provide power for the load.
And a transformer 4 for stabilizing the ac power output from the inverter 3 and outputting the stabilized ac power to a load.
The DC transformer 5 may be a DC-DC converter, and is configured to convert the DC power output from the rectifier 2 into a DC (or approximately DC) power source with different voltage levels.
Illustratively, under normal ac power supply, the rectifier 2 converts ac power to dc power, eliminates interference in the mains supply, and simultaneously charges the battery, and then supplies the inverter 3 to convert dc power to ac power, providing a more stable power supply to the load.
For example, when the ac power is abnormal or the rectifier 2 and the reactor fail, the storage battery provides dc power to the inverter 3, and converts the dc power into ac power to continuously supply power to the load, so that the ac power output is not interrupted, and the load is protected.
For example, when the inverter 3 has an abnormal condition such as a fuse of the inverter 3 is blown, a short circuit, etc., the inverter 3 is automatically cut off to prevent damage, and if the bypass ac power is normal at this time, the static switch 1 switches the power supply to be output to the load by the bypass standby power.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A battery charge and discharge control device, comprising:
the input end of the unidirectional conductive element is used for being connected with the positive electrode of the storage battery, and the output end of the unidirectional conductive element is used for being connected with the positive electrode of the power supply;
a first switching element provided on a connection line between an output end of the unidirectional conductive element and an anode of the power supply to form a first discharge circuit between the storage battery and the power supply in a case where a cathode of the storage battery is connected to the cathode of the power supply;
a second switching element for being connected to the positive electrode of the battery and the positive electrode of the power supply, respectively, to form a second discharge circuit between the battery and the power supply in the case where the negative electrode of the battery is connected to the negative electrode of the power supply;
a current conversion element connected to the power source and the battery, respectively, to form a charging circuit between the battery and the power source;
and the control unit is respectively connected with the first switching element, the second switching element and the current conversion element and used for controlling the on or off of the first discharging circuit, the second discharging circuit and the charging circuit.
2. The battery charge-discharge control device according to claim 1, wherein the current conversion element is a DC-DC converter, a positive electrode input terminal of the DC-DC converter is connected to a positive electrode of the power supply, a positive electrode output terminal of the DC-DC converter is connected to a positive electrode of the secondary battery, a negative electrode input terminal of the DC-DC converter is connected to a negative electrode of the power supply, and a negative electrode output terminal of the DC-DC converter is connected to a negative electrode of the secondary battery to form a charging circuit between the secondary battery and the power supply.
3. The battery charge-discharge control device according to claim 2, wherein the DC-DC converter includes:
the input end of the PMW power conversion circuit is connected with the positive electrode of the power supply, and the output end of the PMW power conversion circuit is connected with the positive electrode of the storage battery and is used for carrying out power conversion on the voltage output by the positive electrode of the power supply according to a preset duty ratio and then transmitting the voltage to the positive electrode of the storage battery;
the output end of the PWM control circuit is connected with the control end of the PMW power conversion circuit, the input end of the PWM control circuit is connected with the control end of the control unit, and the PWM control circuit is used for receiving a control signal sent by the control unit so as to control the on-off state of the charging circuit and sending the preset duty ratio to the PMW power conversion circuit.
4. The battery charge-discharge control device according to claim 3, wherein the DC-DC converter further comprises:
the input end of the input filter circuit is connected with the positive electrode of the power supply, and the output end of the input filter circuit is connected with the input end of the PMW power conversion circuit and is used for carrying out filter processing on the voltage output by the power supply and transmitting the voltage to the PMW power conversion circuit;
and the input end of the output filter circuit is connected with the output end of the PMW power conversion circuit, and the output end of the output filter circuit is connected with the positive electrode of the storage battery and is used for carrying out filter processing on the voltage output by the PMW power conversion circuit and transmitting the voltage to the positive electrode of the storage battery.
5. The battery charge-discharge control device according to any one of claims 1 to 4, wherein the unidirectional conductive element is a diode, an anode of the diode is used for being connected with a positive electrode of a storage battery, and a cathode of the diode is used for being connected with a positive electrode of a power supply;
the first switching element is arranged on a connecting line between the cathode of the diode and the positive electrode of the power supply.
6. The battery charge-discharge control device according to any one of claims 1 to 4, wherein the first switching element and the second switching element are both relays.
7. The battery charge and discharge control device according to claim 6, wherein the first switching element is a normally closed relay.
8. The battery charge-discharge control device according to any one of claims 1 to 4, further comprising:
and the fuse is respectively connected with the anode of the storage battery and the current conversion element.
9. The battery charge-discharge control device according to any one of claims 1 to 4, further comprising:
a dc breaker, wherein a first end of a first pair of connection ends of the dc breaker is connected to the first switching element, the second switching element and the current conversion element, respectively, and a second end of the first pair of connection ends is used for being connected to a positive electrode of the power supply;
and a first end of a second pair of connecting ends of the direct current breaker is used for being connected with the negative electrode of the storage battery, and a second end of the second pair of connecting ends is used for being connected with the negative electrode of the power supply.
10. An uninterruptible power supply system, comprising:
a power supply;
a plurality of storage batteries;
a plurality of battery charge-discharge control devices according to any one of claims 1 to 9, each of said battery charge-discharge control devices being connected to a corresponding one of the storage batteries.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321016807.5U CN219843447U (en) | 2023-04-27 | 2023-04-27 | Battery charge-discharge control device and uninterruptible power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321016807.5U CN219843447U (en) | 2023-04-27 | 2023-04-27 | Battery charge-discharge control device and uninterruptible power supply system |
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| CN219843447U true CN219843447U (en) | 2023-10-17 |
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| CN202321016807.5U Active CN219843447U (en) | 2023-04-27 | 2023-04-27 | Battery charge-discharge control device and uninterruptible power supply system |
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| CN (1) | CN219843447U (en) |
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