CN112583102A - Uninterruptible power supply and charge-discharge control method - Google Patents
Uninterruptible power supply and charge-discharge control method Download PDFInfo
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- CN112583102A CN112583102A CN201910924997.2A CN201910924997A CN112583102A CN 112583102 A CN112583102 A CN 112583102A CN 201910924997 A CN201910924997 A CN 201910924997A CN 112583102 A CN112583102 A CN 112583102A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 88
- 230000002457 bidirectional effect Effects 0.000 claims description 85
- 230000000630 rising effect Effects 0.000 claims description 47
- 238000007600 charging Methods 0.000 claims description 32
- 238000007599 discharging Methods 0.000 claims description 17
- 238000005070 sampling Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 abstract description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052744 lithium Inorganic materials 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010277 constant-current charging Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000000750 progressive effect Effects 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
- H02J9/061—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 DC powered loads
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Business, Economics & Management (AREA)
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Abstract
The invention provides an uninterruptible power supply and a charge-discharge control method, which are applied to the technical field of power electronics. The super capacitor group is used as the energy storage device, and the chargeable and dischargeable times of the super capacitor group are far higher than those of the lithium battery, so that the defect that the lithium battery is used as the energy storage device in the prior art can be overcome, the service life of the UPS is prolonged, and the requirements of practical application are met.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an uninterruptible power supply and a charge and discharge control method.
Background
UPS (Uninterruptible Power Supply) is mainly used to provide stable and uninterrupted Power Supply to important devices such as servers. When the input of the public power grid is normal, the public power grid supplies power to the load, and when the public power grid is powered off due to a fault, the UPS immediately supplies the stored direct current power to the load so as to maintain the continuous power supply of the load in a short time and ensure that a user has enough time to store important data.
The energy storage device is a key component of the UPS and determines whether the UPS is capable of providing sufficient emergency power to ensure successful storage of important data. In practical application, the lithium battery has the advantages of light weight, short charging time and the like, and is a commonly used energy storage device in the UPS at present.
However, due to the limitation of the lithium battery technology, the charging and discharging times of the lithium battery are limited, so that the service life of the UPS is short, and the requirements of practical application are difficult to meet.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an uninterruptible power supply and a charge/discharge control method thereof, so as to overcome the defect of using a lithium battery as an energy storage device in the prior art, prolong the service life of a UPS, and meet the requirements of practical applications, and the specific scheme is as follows:
in a first aspect, the present application provides an uninterruptible power supply, comprising: a bi-directional buck/boost circuit, a super capacitor bank, and a controller, wherein,
one end of the bidirectional voltage rising/dropping circuit is respectively connected with a power supply and a load, and the other end of the bidirectional voltage rising/dropping circuit is connected with the super capacitor bank;
the controller is connected with the control end of the bidirectional voltage rising/reducing circuit, and the controller is used for controlling the bidirectional voltage rising/reducing circuit to work in a charging mode under the condition that the power supply normally supplies power, so that the power supply charges the super capacitor bank, and controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode under the condition that the power supply is powered off, so that the super capacitor bank supplies power to the load.
Optionally, the bidirectional buck/boost circuit includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, an inductor, a first sampling resistor, and a second sampling resistor, wherein,
the first MOS tube, the second MOS tube and the first sampling resistor are sequentially connected in series to obtain a first series branch;
the third MOS tube, the fourth MOS tube and the second sampling resistor are sequentially connected in series to obtain a second series branch;
one end of the inductor is connected with the series connection point of the first MOS tube and the second MOS tube, and the other end of the inductor is connected with the series connection point of the third MOS tube and the fourth MOS tube.
Optionally, the bidirectional up/down circuit further includes: a first filter capacitor and a second filter capacitor, wherein,
the first filter capacitor and the second filter capacitor are respectively connected in parallel to two ends of the first series branch.
In a second aspect, the present invention further provides a charge and discharge control method applied to the controller of the uninterruptible power supply according to any one of the first aspects of the present invention, including:
monitoring the working state of a power supply connected with the uninterruptible power supply;
if the power supply normally supplies power, the bidirectional voltage rising/reducing circuit is controlled to work in a charging mode so as to charge a super capacitor bank of the uninterruptible power supply;
and if the power supply is powered off, controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode so as to realize that the super capacitor bank supplies power to a load connected with the uninterruptible power supply.
Optionally, if the power supply is normally powered, the bidirectional buck/boost circuit is controlled to operate in a charging mode, including:
under the condition that the power supply is normally powered, controlling the bidirectional voltage rising/reducing circuit to work in a boost mode, and monitoring the charging current value of the bidirectional voltage rising/reducing circuit;
and if the charging current value is within a preset constant current range, controlling the bidirectional voltage rising/reducing circuit to charge the super capacitor bank in a constant current mode.
Optionally, if the charging current value decreases to be smaller than the lower limit value of the preset constant current range, the bidirectional buck/boost circuit is controlled to charge the super capacitor bank in a constant voltage manner.
Optionally, if the power supply is powered off, the controlling the bidirectional buck/boost circuit to operate in the discharging mode includes:
monitoring the output voltage of the super capacitor;
if the output voltage is larger than the upper limit value of the preset voltage range, controlling the bidirectional buck/boost circuit to work in a buck mode;
and if the output voltage is smaller than the lower limit value of the preset voltage range and larger than a preset voltage threshold value, controlling the bidirectional voltage rising/dropping circuit to work in a boost mode, wherein the preset voltage range is set based on the rated working voltage of the load, and the preset voltage threshold value is smaller than the lower limit value of the preset voltage range.
Optionally, if the output voltage is greater than the upper limit value of the preset voltage range, the bidirectional buck/boost circuit is controlled to operate in the buck mode.
Optionally, if the output voltage is within the preset voltage range, the bidirectional buck/boost circuit is controlled to operate in the buck-boost mode.
Optionally, if the output voltage is smaller than the preset voltage threshold, the bidirectional voltage rising/dropping circuit is turned off.
The uninterruptible power supply provided by the invention comprises a bidirectional voltage rising/reducing circuit, a super capacitor bank and a controller, wherein one end of the bidirectional voltage rising/reducing circuit is respectively connected with a power supply and a load, the other end of the bidirectional voltage rising/reducing circuit is connected with the super capacitor bank, and the controller is connected with the control end of the bidirectional voltage rising/reducing circuit and is used for controlling the bidirectional voltage rising/reducing circuit to work in a charging mode to charge the super capacitor bank under the condition that the power supply is normally powered on and controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode to supply power to the load under the condition that the power supply is powered off. According to the uninterruptible power supply provided by the invention, the super capacitor group is used as the energy storage device, and the chargeable and dischargeable times of the super capacitor group are far higher than those of the lithium battery, so that the defect that the lithium battery is used as the energy storage device in the prior art can be overcome, the service life of the UPS is prolonged, and the requirements of practical application are met.
Furthermore, because the super capacitor bank is used as the energy storage device, the service life of the UPS is effectively prolonged, the UPS does not need to be frequently replaced, and the UPS can be integrated inside the load and is more convenient and faster.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit topology diagram of an ups according to an embodiment of the present invention;
fig. 2 is a flowchart of a charging and discharging control method according to an embodiment of the present invention;
fig. 3 is a circuit topology diagram of the bidirectional buck/boost circuit according to the embodiment of the present invention, which operates in buck mode;
fig. 4 is a control waveform diagram corresponding to the bidirectional buck/boost circuit provided in the embodiment of the present invention when operating in buck mode;
fig. 5 is a circuit topology diagram of the bidirectional buck/boost circuit according to the embodiment of the present invention, which operates in buck-boost mode;
fig. 6 is a control waveform diagram corresponding to the bidirectional buck/boost circuit provided by the embodiment of the invention when the bidirectional buck/boost circuit operates in buck-boost mode;
fig. 7 is a circuit topology diagram of the bidirectional buck/boost circuit operating in the boost mode when the super capacitor bank supplies power to the load according to the embodiment of the present invention;
fig. 8 is a waveform diagram of a control waveform corresponding to the bidirectional buck/boost circuit operating in the boost mode when the super capacitor bank provides power to the load according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Optionally, referring to fig. 1, fig. 1 is a circuit topology diagram of an uninterruptible power supply according to an embodiment of the present invention, where the uninterruptible power supply according to the embodiment of the present invention includes: a bi-directional buck/boost circuit, a super capacitor bank, and a controller (not shown), wherein,
one end of the bidirectional step-up/step-down circuit is respectively connected with a power supply and a load (not shown in the figure), and the other end of the bidirectional step-up/step-down circuit is connected with the super capacitor bank.
It should be noted that, in the embodiment of the present invention, the power supply connected to the bidirectional step-up/step-down circuit outputs a DC power supply, and in practical applications, an AC/DC converter may be selected, and an input terminal of the AC/DC converter is connected to an AC public power grid, and is connected to the bidirectional step-up/step-down circuit of the uninterruptible power supply provided in the embodiment of the present invention after AC/DC conversion. Similarly, the load is connected to the power source that finally outputs the dc power, and the description thereof is omitted.
Optionally, the bidirectional buck/boost circuit provided in the embodiment of the present invention includes a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3, a fourth MOS transistor Q4, an inductor L, and a first sampling resistor Rs1And a second sampling resistor Rs2Wherein, in the step (A),
first MOS transistor Q1, second MOS transistor Q2 and first sampling resistor Rs1The first series branch is sequentially connected in series to form a first series branch, one end of the first series branch is connected with the positive pole of a power supply, and the other end of the first series branch is connected with the negative pole of the power supply. Of course, both ends of the first series branch are also connected to the input end of the load at the same time.
A third MOS transistor Q3, a fourth MOS transistor Q4 and a second sampling transistorResistance Rs2And sequentially connecting in series to obtain a second series branch, wherein one end of the second series branch is connected with the anode of the super capacitor bank, and the other end of the second series branch is connected with the cathode of the super capacitor bank. Optionally, the super capacitor bank selected in the embodiment of the present invention is a super capacitor bank with a rated voltage of 86V, it is conceivable that other super capacitor banks with rated voltages are also selectable, and the super capacitor bank is selected in consideration of charging/discharging voltages, duration of emergency power supply provided by an uninterruptible power supply in case of power failure of a public power grid due to a fault, total cost, and other factors, but the super capacitor bank also belongs to the protection scope of the present invention on the premise of not exceeding the core idea scope of the present invention.
The inductor L is connected in series between the first series branch and the second series branch, specifically, one end of the inductor L is connected to the series connection point of the first MOS transistor Q1 and the second MOS transistor Q2 in the first series branch, and the other end of the inductor L is connected to the series connection point of the third MOS transistor Q3 and the fourth MOS transistor Q4 in the second series branch.
The controller is connected with the control end of the bidirectional voltage rising/reducing circuit, specifically, the controller is connected with gate poles of the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 respectively, and the controller is used for controlling the bidirectional voltage rising/reducing circuit to work in a charging mode under the condition that a power supply normally supplies power, conducting a charging loop between the power supply and the super capacitor bank and realizing that the power supply charges the super capacitor bank. Further, the controller is also used for controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode under the condition that the power supply is powered off, and a discharging loop between the super capacitor bank and the load is conducted, so that the super capacitor bank supplies power to the load.
Optionally, the controller may select a digital control chip with a model of TI UCD3138, and control the operating mode of the bidirectional buck/boost circuit through a digital signal. Furthermore, the TIUCD3138 is selected as a controller, and can be directly communicated with the BMC or the CPU of the server mainboard serving as a load in a PMBUS communication mode, so that the server can be informed of starting power failure protection in time when the public power grid is powered off due to reasons, and data can be stored.
Optionally, in order to improve the power supply quality, the bidirectional up/down circuit further includes: and the first filter capacitor C1 and the second filter capacitor C2 are respectively connected in parallel to two ends of the first series branch, and are used for reducing an input ripple of the input bidirectional buck/boost circuit.
In summary, the uninterruptible power supply provided by the invention adopts the super capacitor bank as the energy storage device, and the chargeable and dischargeable times of the super capacitor bank are far higher than those of the lithium battery, so that the defect that the lithium battery is used as the energy storage device in the prior art can be overcome, the service life of the UPS can be prolonged, and the requirements of practical application can be met. Meanwhile, the super capacitor group is used as an energy storage device, the service life of the UPS is effectively prolonged, and the UPS does not need to be frequently replaced, so that the UPS can be integrated inside the load, and the UPS is more convenient and faster.
Furthermore, the working mode of the bidirectional voltage rising/reducing circuit is controlled by the controller through digital signals, and compared with the control mode of building a control circuit by adopting an analog circuit in the prior art, the use quantity of electronic components can be effectively reduced, and the manufacturing cost of products is effectively reduced. And adopt the controller to implement digital signal control, can realize the isolation drive to power switch tube in the two-way step-up/step-down circuit, through improving the rated operating voltage of power switch tube, can also improve uninterrupted power source's the highest input voltage and the highest output voltage to do not control the influence of controller, consequently, can improve uninterrupted power source's application scope greatly. Specifically, in the prior art, the situation that the control circuit is built by adopting the analog circuit is adopted, the control circuit is connected with the energy storage and conversion circuit in a non-isolated manner, and the output voltage of the uninterruptible power supply can reach 60V at most.
Optionally, referring to fig. 2, fig. 2 is a flowchart of a charging and discharging control method according to an embodiment of the present invention, where the charging and discharging control method according to the embodiment of the present invention is applied to a controller in an uninterruptible power supply according to any of the embodiments, and the flowchart of the charging and discharging control method according to the embodiment of the present invention may include:
and S100, monitoring the working state of a power supply connected with the UPS.
The working state of the power supply can be roughly divided into two conditions, namely a normal power supply state and a power-off state, under the condition that the power supply supplies power normally, the power supply provides electric energy required by normal work for a load, and meanwhile, under the condition that a super capacitor bank in the uninterruptible power supply needs energy storage, the super capacitor bank is not charged; in the power-off state, the power supply will no longer supply power to the load or the uninterruptible power supply.
Optionally, the monitoring of the working state of the power supply connected to the uninterruptible power supply may be implemented by detecting the output voltage of the power supply, or may be implemented by other methods in the prior art.
And S110, judging whether the power supply supplies power normally, if so, executing S120, and if not, executing S130.
Optionally, if the determination is performed by the output voltage of the power supply, for example, under the condition that the power supply is normally powered, 12V dc voltage is output, accordingly, the output voltage of the power supply may be continuously obtained, and as long as the output voltage of the power supply is within the preset range, the power supply may be considered to be in the normal operating state. Conversely, if the power supply output voltage drops to 0V, it can be determined that the power supply is in a power-off state.
If the power supply is judged to be in a normal working state, S120 is executed, and the bidirectional voltage rising/reducing circuit is controlled to work in a charging mode so as to charge the super capacitor bank serving as the uninterruptible power supply; and if the power supply is in the power-off state, controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode so as to realize that the super capacitor bank supplies power for the load connected with the uninterruptible power supply.
And S120, controlling the bidirectional voltage rising/reducing circuit to work in a charging mode so as to charge the super capacitor bank of the uninterruptible power supply.
Optionally, the charging process of the super capacitor bank can be divided into a constant current charging stage and a constant voltage charging stage. Specifically, the circuit topology of the ups provided by the embodiment of the present invention shown in fig. 1 is described.
And under the condition that the power supply normally supplies power, the bidirectional voltage rising/reducing circuit is controlled to work in a boost mode, the power supply charges the super capacitor bank, the charging current value of the bidirectional voltage rising/reducing circuit is monitored, the charging current gradually increases from zero at the initial stage of charging until the charging current value rises to a preset constant current range, and if the charging current value is in the preset constant current range, the bidirectional voltage rising/reducing circuit is controlled to charge the super capacitor bank in a constant current mode.
Specifically, the controller controls a first MOS tube Q1 in the bidirectional buck/boost circuit to be normally closed, a second MOS tube Q2 is normally open, a third MOS tube Q3 is normally closed, a fourth MOS tube Q4 works in a PWM (pulse width modulation) switching state, the circuit is in a boost mode, and constant current charging is carried out on the super capacitor bank.
And if the charging current value measured according to the sampling resistor is reduced to be smaller than the lower limit value of the preset constant current range, controlling the bidirectional buck/boost circuit to charge the super capacitor bank in a constant voltage mode.
Specifically, the controller controls a first MOS tube Q1 in the bidirectional voltage rising/reducing circuit to be normally closed, a second MOS tube Q2 is normally open, a third MOS tube Q3 is normally closed, a fourth MOS tube Q4 works in a PWM (pulse width modulation) switching state, the bidirectional voltage rising/reducing circuit is in a boost mode, the charging current is gradually reduced, and the bidirectional voltage rising/reducing circuit is in a constant voltage state.
It should be noted that, after the charging of the super capacitor bank is completed, the bidirectional up/down voltage circuit maintains the constant voltage state, and it is ensured that the super capacitor bank is in a full-charge state at all times.
And S130, controlling the bidirectional voltage rising/dropping circuit to work in a discharging mode so as to realize that the super capacitor bank supplies power for a load connected with the uninterrupted power supply.
Under the condition of power failure of a power supply, the super capacitor bank provides emergency electric energy for the load, and in the specific power supply process, along with the change of the output voltage of the super capacitor bank, the working mode of the bidirectional voltage rising/reducing circuit is converted, so that the energy stored by the super capacitor bank is fully exerted, and the time for the uninterrupted power supply to perform functions on the load is prolonged as far as possible.
Specifically, the output voltage of the super capacitor is monitored, and at the initial stage of power failure, the output voltage of the super capacitor bank is larger than the upper limit value of the preset voltage range, so that the bidirectional buck/boost circuit is controlled to work in a buck mode, and the rated working voltage required by the load is obtained after voltage reduction.
Optionally, referring to fig. 3 and fig. 4, where fig. 3 is a circuit topology diagram of the bidirectional up/down circuit provided in the embodiment of the present invention when operating in the buck mode, and fig. 4 is a control waveform diagram of the bidirectional up/down circuit provided in the embodiment of the present invention when operating in the buck mode. When the bidirectional buck/boost circuit works in the buck mode, the first MOS transistor Q1 is normally closed, the second MOS transistor Q2 is normally open, and the third MOS transistor Q3 and the fourth MOS transistor Q4 work in the PWM switching state to maintain the normal power supply of the load.
With the continuous discharge of the super capacitor bank, the output voltage of the super capacitor bank is within a preset voltage range, and in this case, the bidirectional buck/boost circuit is controlled to work in buck-boost mode.
Optionally, referring to fig. 5 and fig. 6, fig. 5 is a circuit topology diagram of the bidirectional up/down circuit provided in the embodiment of the present invention, which operates in the buck-boost mode, and fig. 6 is a control waveform diagram of the bidirectional up/down circuit provided in the embodiment of the present invention, which operates in the buck-boost mode. When the bidirectional buck/boost circuit works in buck-boost mode, the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 respectively work in a PWM switching state alternately, the output voltage continues to be stabilized at 12V, and the load works normally.
In the embodiment of the invention, a preset voltage threshold value for stopping the work of the super capacitor bank is also set, the voltage threshold value is smaller than the lower limit value of the preset voltage range, and under the condition that the output voltage of the super capacitor bank is smaller than the lower limit value of the preset voltage range but larger than the preset voltage threshold value, the output voltage of the super capacitor bank is lower than the rated working voltage of the load.
Optionally, referring to fig. 7 and fig. 8, where fig. 7 is a circuit topology diagram of the bidirectional voltage rising/dropping circuit operating in the boost mode when the super capacitor bank provided by the embodiment of the present invention supplies power to the load, and fig. 8 is a control waveform diagram corresponding to the bidirectional voltage rising/dropping circuit operating in the boost mode when the super capacitor bank provided by the embodiment of the present invention supplies power to the load. When the bidirectional buck/boost circuit works in a boost mode, the third MOS tube Q3 is normally closed, the fourth MOS tube Q4 is normally open, the first MOS tube Q1 is normally closed, the second MOS tube Q2 works in a PWM (pulse width modulation) switching state, and the output voltage of the super capacitor group is continuously stabilized at the rated working voltage of a load.
If the power supply is in a power-off state continuously, the output voltage of the super capacitor bank becomes smaller than a preset voltage threshold, at the moment, the bidirectional voltage rising/reducing circuit is closed, and power supply to the load is stopped.
It should be noted that the preset voltage range mentioned above can be set according to the rated operating voltage of the load, for example, the rated operating voltage of the load is 12V, and then the preset voltage range can be set to 12 ± 0.5% V. Of course, the preset voltage range may also be adjusted in a targeted manner according to the requirement of the load on the rated operating voltage, and the specific setting of the preset voltage range is not limited in the present invention. For the preset voltage threshold, the voltage can be set relatively lower, so that the super capacitor bank can be prevented from being over-discharged, and the preset voltage threshold can be set to be 5V along with the previous example.
In summary, according to the charge and discharge control method provided by the embodiment of the present invention, when the super capacitor bank is charged by the power supply, the super capacitor bank may operate in the constant current mode or the constant voltage mode, so as to store energy fully for the super capacitor bank, and when the super capacitor bank is used as the power supply to supply power to the load, the super capacitor bank may operate in the step-down mode or the step-up mode, and by continuously switching the operation modes, the full utilization of the energy stored in the super capacitor bank is realized, the power supply time of the uninterruptible power supply to the load is prolonged as much as possible, and the normal operation of the load is ensured.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An uninterruptible power supply, comprising: a bi-directional buck/boost circuit, a super capacitor bank, and a controller, wherein,
one end of the bidirectional voltage rising/dropping circuit is respectively connected with a power supply and a load, and the other end of the bidirectional voltage rising/dropping circuit is connected with the super capacitor bank;
the controller is connected with the control end of the bidirectional voltage rising/reducing circuit, and the controller is used for controlling the bidirectional voltage rising/reducing circuit to work in a charging mode under the condition that the power supply normally supplies power, so that the power supply charges the super capacitor bank, and controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode under the condition that the power supply is powered off, so that the super capacitor bank supplies power to the load.
2. The UPS of claim 1, wherein the bi-directional buck/boost circuit comprises a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, an inductor, a first sampling resistor and a second sampling resistor, wherein,
the first MOS tube, the second MOS tube and the first sampling resistor are sequentially connected in series to obtain a first series branch;
the third MOS tube, the fourth MOS tube and the second sampling resistor are sequentially connected in series to obtain a second series branch;
one end of the inductor is connected with the series connection point of the first MOS tube and the second MOS tube, and the other end of the inductor is connected with the series connection point of the third MOS tube and the fourth MOS tube.
3. The uninterruptible power supply of claim 1, wherein the bi-directional buck/boost circuit further comprises: a first filter capacitor and a second filter capacitor, wherein,
the first filter capacitor and the second filter capacitor are respectively connected in parallel to two ends of the first series branch.
4. A charge/discharge control method applied to the controller of the uninterruptible power supply according to any one of claims 1 to 3, the method comprising:
monitoring the working state of a power supply connected with the uninterruptible power supply;
if the power supply normally supplies power, the bidirectional voltage rising/reducing circuit is controlled to work in a charging mode so as to charge a super capacitor bank of the uninterruptible power supply;
and if the power supply is powered off, controlling the bidirectional voltage rising/reducing circuit to work in a discharging mode so as to realize that the super capacitor bank supplies power to a load connected with the uninterruptible power supply.
5. The charge and discharge control method according to claim 4, wherein if the power supply is supplying power normally, controlling the bi-directional step-up/step-down circuit to operate in the charging mode comprises:
under the condition that the power supply is normally powered, controlling the bidirectional voltage rising/reducing circuit to work in a boost mode, and monitoring the charging current value of the bidirectional voltage rising/reducing circuit;
and if the charging current value is within a preset constant current range, controlling the bidirectional voltage rising/reducing circuit to charge the super capacitor bank in a constant current mode.
6. The charge and discharge control method according to claim 5, wherein if the charge current value decreases to less than a lower limit value of the predetermined constant current range, the bidirectional buck/boost circuit is controlled to charge the super capacitor bank in a constant voltage manner.
7. The charge and discharge control method according to claim 4, wherein the controlling the bi-directional buck/boost circuit to operate in the discharging mode if the power supply is powered off comprises:
monitoring the output voltage of the super capacitor bank;
if the output voltage is larger than the upper limit value of the preset voltage range, controlling the bidirectional buck/boost circuit to work in a buck mode;
and if the output voltage is smaller than the lower limit value of the preset voltage range and larger than a preset voltage threshold value, controlling the bidirectional voltage rising/dropping circuit to work in a boost mode, wherein the preset voltage range is set based on the rated working voltage of the load, and the preset voltage threshold value is smaller than the lower limit value of the preset voltage range.
8. The charge and discharge control method according to claim 7, wherein if the output voltage is within the preset voltage range, the bidirectional buck/boost circuit is controlled to operate in buck-boost mode.
9. The charge and discharge control method according to claim 7, wherein if the output voltage is less than the predetermined voltage threshold, the bi-directional step-up/down circuit is turned off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910924997.2A CN112583102A (en) | 2019-09-27 | 2019-09-27 | Uninterruptible power supply and charge-discharge control method |
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| CN201910924997.2A CN112583102A (en) | 2019-09-27 | 2019-09-27 | Uninterruptible power supply and charge-discharge control method |
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Application publication date: 20210330 |