CN117318486A - Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof - Google Patents

Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof Download PDF

Info

Publication number
CN117318486A
CN117318486A CN202311113561.8A CN202311113561A CN117318486A CN 117318486 A CN117318486 A CN 117318486A CN 202311113561 A CN202311113561 A CN 202311113561A CN 117318486 A CN117318486 A CN 117318486A
Authority
CN
China
Prior art keywords
main
circuit
bidirectional
control unit
pwm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311113561.8A
Other languages
Chinese (zh)
Inventor
汤前进
褚仁林
张华锋
彭瑞
柯万宇
张修德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan Huazhong Numerical Control Co Ltd
Original Assignee
Wuhan Huazhong Numerical Control Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan Huazhong Numerical Control Co Ltd filed Critical Wuhan Huazhong Numerical Control Co Ltd
Priority to CN202311113561.8A priority Critical patent/CN117318486A/en
Publication of CN117318486A publication Critical patent/CN117318486A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a bidirectional energy storage circuit supporting a power failure maintaining function and a control method thereof, wherein the bidirectional energy storage circuit comprises a bidirectional DC/DC main circuit, an energy storage module, a main control unit, a first isolation driving circuit and a sampling circuit, one end of the bidirectional DC/DC main circuit is a PN bus end, the other end of the bidirectional DC/DC main circuit is connected with the energy storage module, the sampling circuit is used for collecting PN bus voltage and transmitting the PN bus voltage to the main control unit, the main control unit is used for receiving PN bus voltage, outputting multipath PWM signals to the grid electrodes of a plurality of main power tubes of the bidirectional DC/DC main circuit respectively through the first isolation driving circuit, outputting two groups of same-frequency synchronous PWM waves to the bidirectional DC/DC main circuit through the main control unit to realize closed loop control of buck and boost, completing bidirectional energy transmission, and in addition, the auxiliary control unit and the like are arranged for realizing boost and buck conduction control and boost abnormal overload and short-circuit protection control. The whole circuit architecture of the circuit can realize high-power conversion output in an interleaving mode by using the cheapest control device.

Description

Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof
Technical Field
The invention belongs to the field of equipment manufacturing, and particularly relates to a bidirectional energy storage circuit supporting a power failure maintaining function and a control method thereof.
Background
With the vigorous development of equipment manufacturing industry, the requirement for timely completing a rollback function of various processing equipment when a power grid is powered off is increasing, and the requirement for maintaining the power supply time of a bus-bar end is longer and longer when the power grid is powered off. The scheme adopted at present is to directly connect a high-capacity capacitor combination device at the bus end or to manufacture a DC/DC bidirectional inverter power supply with an energy storage device. The large-capacity capacitor combination device is adopted, and when a plurality of combination devices are required to be connected in parallel in an environment requiring long back-off time, a large installation control time is occupied, the large-capacity capacitor combination device is not adopted. The DC/DC bidirectional inverter power supply with the energy storage device is multipurpose two-phase or three-phase staggered topological structure to realize bidirectional energy transfer, the main control unit basically adopts FPGA, DSP or ARM plus peripheral AD, DA and a special driving chip to realize logic functions, hardware and software engineers are required to cooperatively complete the work, the device cost is high, the after-sales maintenance cost and the labor cost are high, and in the use process, the functions of the main control unit are required to be realized by being interconnected with signals and voltage ports of other equipment, the main control unit cannot exist as an independent product, and the main control unit is difficult to be adopted by a designer.
Disclosure of Invention
The invention aims to overcome at least one defect in the prior art and provides a bidirectional energy storage circuit supporting a power failure maintaining function and a control method thereof.
The technical scheme of the invention is realized as follows: the invention discloses a bidirectional energy storage circuit supporting a power failure maintaining function, which comprises a bidirectional DC/DC main circuit, an energy storage module, a main control unit, a first driving circuit and a sampling circuit, wherein one end of the bidirectional DC/DC main circuit is a PN bus end, the other end of the bidirectional DC/DC main circuit is connected with the energy storage module, the sampling circuit is used for collecting PN bus voltage and transmitting the PN bus voltage to the main control unit, the main control unit is used for receiving the PN bus voltage collected by the sampling circuit, and outputting multipath PWM signals which are respectively and correspondingly transmitted to grids of a plurality of main power tubes of the bidirectional DC/DC main circuit through the first driving circuit.
The first driving circuit is an isolation driving circuit.
Further, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a PN bus box, wherein a PN bus end of the bidirectional DC/DC main circuit is connected with the PN bus box, and the PN bus end is connected with electric equipment of a power grid and a common bus through the PN bus box.
Further, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a second driving circuit, an auxiliary control unit and a switching tube Q5 for controlling on-off between the bidirectional DC/DC main circuit and the energy storage module, wherein a grid electrode of the switching tube Q5 is connected with the auxiliary control unit through the second driving circuit, when the bidirectional DC/DC main circuit operates in a BUCK mode and charging voltage reaches a certain threshold value, the auxiliary control unit is used for controlling the switching tube Q5 to be conducted through the second driving circuit, when electric equipment of the common bus completes required processing operation, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off in a delayed mode or turned off instantly through the second driving circuit, and when the bidirectional DC/DC main circuit operates in a BOOST mode and discharges abnormally or a PN bus has overload or short circuit, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off instantly through the second driving circuit.
The second driving circuit is an isolation driving circuit.
Further, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a first power supply circuit for supplying power to the main control unit, the first driving circuit and the sampling circuit and a second power supply circuit for supplying power to the second driving circuit and the auxiliary control unit, wherein the input end of the first power supply circuit is connected with the PN bus end, and the input end of the second power supply circuit is connected with the output end of the energy storage module.
Further, the bidirectional DC/DC main circuit includes four main power tubes, where a source electrode of the main power tube Q1 is connected to a drain electrode of the main power tube Q2 and one end of the first inductor, a source electrode of the main power tube Q3 is connected to a drain electrode of the main power tube Q4 and one end of the second inductor, a drain electrode of the main power tube Q1 and a drain electrode of the main power tube Q3 are connected to the P1 end, a source electrode of the main power tube Q2 and a source electrode of the main power tube Q4 are connected to the N1 end, a gate electrode of the main power tube Q1, a gate electrode of the main power tube Q2, a gate electrode of the main power tube Q3 and a gate electrode of the main power tube Q4 are connected to a second PWM signal output end, a third PWM signal output end, a first PWM signal output end and a fourth PWM signal output end of the main control unit respectively through a first driving circuit, another end of the first inductor and another end of the second inductor are connected to a source electrode of the switch tube Q5, and a drain electrode of the switch tube Q5 is connected to the P2 end.
Further, the first PWM signal output end of the main control unit outputs a PWMA1 signal, the second PWM signal output end of the main control unit outputs a PWMB1 signal, the third PWM signal output end of the main control unit outputs a PWMA2 signal, and the fourth PWM signal output end of the main control unit outputs a PWMB2 signal;
the PWMA1 signal and the PWMB1 signal are 180 degrees;
the PWMA2 signal and the PWMB2 signal are 180 degrees;
the PWMA1 signal, the PWMB1 signal, the PWMA2 signal and the PWMB2 signal are PWM signals with the same frequency, synchronization and the same dead zone;
in the operation of the bidirectional DC/DC main circuit, PWM signals of the main power tube Q1 and the main power tube Q2 are 180 degrees;
and PWM signals of the main power tube Q3 and the main power tube Q4 in the operation of the bidirectional DC/DC main circuit are 180 degrees.
Further, a first diode is connected between the source electrode and the drain electrode of each main power tube, the cathode of the first diode is connected with the drain electrode of the corresponding main power tube, and the anode of the first diode is connected with the source electrode of the corresponding main power tube; a second diode is connected between the source electrode and the drain electrode of the switching tube Q5, the cathode of the second diode is connected with the drain electrode of the switching tube Q5, and the anode of the second diode is connected with the source electrode of the switching tube Q5.
Further, the second PWM signal output terminal PWMB1 and the first PWM signal output terminal PWMA1 of the main control unit are respectively connected with the gate of the main power tube Q1 and the gate of the main power tube Q3 of the bidirectional DC/DC main circuit through the first driving circuit, and form a BUCK circuit in BUCK staggered mode with the first inductor, the second inductor, the first diode connected with the drain and source of the main power tube Q2 and the first diode connected with the drain and source of the main power tube Q4;
the third PWM signal output terminal PWMB2 and the fourth PWM signal output terminal PWMB2 of the main control unit are respectively connected with the gate of the main power tube Q4 and the gate of the main power tube Q2 of the bidirectional DC/DC main circuit through the first driving circuit, and form a BOOST circuit in BOOST staggered mode with the first inductor, the second inductor, the first diode connected with the drain and source of the main power tube Q3, and the first diode connected with the drain and source of the main power tube Q1.
Further, the main control unit comprises a first PWM control chip IC1, a second PWM control chip IC2, a timing capacitor CT, a timing resistor RT and a dead zone resistor RD, wherein one end of the timing capacitor CT is connected with a CT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with an RT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with the GND, one end of the dead zone resistor RD is connected with the CT pin of the second PWM control chip IC2, and the other end of the dead zone resistor RD is connected with a DISCH pin of the second PWM control chip IC 2; the OSC pin of the second PWM control chip IC2 is connected to the OSC pin of the first PWM control chip IC1, the CT pin of the second PWM control chip IC2 is connected to the CT pin of the first PWM control chip IC1, the RT pin of the second PWM control chip IC2 is connected to the RT pin of the first PWM control chip IC1, the DISCH pin of the second PWM control chip IC2 is connected to the DISCH pin of the first PWM control chip IC1, the OUTA pin of the first PWM control chip IC1 is the first PWM signal output end PWMA1 of the master control unit, the OUTB pin of the first PWM control chip IC1 is the second PWM signal output end PWMB1 of the master control unit, the OUTA pin of the second PWM control chip IC2 is the third PWM signal output end PWMA2 of the master control unit, the OUTB pin of the second PWM control chip IC2 is the fourth PWM signal output end PWMB2 of the master control unit, the OUTA and the OUTA pin output signals of the first PWM control chip IC1 are 180 degrees, and the OUTA pin of the OUTA and the output signals of the mutual PWM pins of the second PWM control chip IC2 are 180 degrees.
Further, at least one capacitor is connected in series between the P1 end and the N end;
or/and the combination of the two,
at least one capacitor is connected in series between the P2 end and the N2 end;
or/and the combination of the two,
a resistor RL1 is connected in series between the N terminal and the N1 terminal;
or/and the combination of the two,
a resistor RL2 is connected in series between the N1 end and the N2 end.
The invention also discloses a control method of the bidirectional energy storage circuit supporting the power failure maintaining function, which comprises the following steps:
the sampling circuit collects PN bus voltage and transmits the PN bus voltage to the main control unit;
the main control unit receives PN bus voltage acquired by the sampling circuit and compares the PN bus voltage with a set threshold value;
when PN bus voltage is greater than or equal to a first threshold value, the main control unit outputs PWM signals which are 180 degrees from each other to alternately carry out chopping control on a main power tube Q1 and a main power tube Q3 of the bidirectional DC/DC main circuit, and the bidirectional DC/DC main circuit is controlled to operate in a BUCK BUCK mode to charge the energy storage module;
when the PN bus voltage is smaller than or equal to a second threshold value, the main control unit outputs PWM signals which are 180 degrees from each other to alternately chopper control the main power tube Q2 and the main power tube Q4 of the bidirectional DC/DC main circuit, the main control unit controls the bidirectional DC/DC main circuit to be converted into a BOOST mode, and energy of the energy storage module is controlled to be fed back to the PN bus end to continuously supply power to the PN bus.
Further, the other end of the bidirectional DC/DC main circuit is provided with a switching tube Q5 for controlling on-off between the bidirectional DC/DC main circuit and the energy storage module; when the bidirectional DC/DC main circuit operates in a BUCK mode and the charging voltage reaches a certain threshold value, the switching tube Q5 is controlled to be conducted;
when the bidirectional DC/DC main circuit operates in the BUCK mode, if the switching tube Q5 is in an off state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module in a constant current manner through a diode connected with the drain and the source of the switching tube Q5; if the switching tube Q5 is in a conducting state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module through the switching tube Q5;
when the bidirectional DC/DC main circuit operates in the BUCK mode, if the electric quantity of the energy storage module is full, the bidirectional DC/DC main circuit is converted into an intermittent floating charge state;
when the electric equipment of the common bus completes the required processing operation, the control switch tube Q5 is turned off in a delayed mode or turned off immediately.
The invention has at least the following beneficial effects:
the grid electrodes of a power tube Q1, a power tube Q2, a power tube Q3 and a power tube Q4 of the bidirectional DC/DC main circuit are respectively connected to the signal ends PWMB1, PWMA2, PWMA1 and PWMB2 of the main control unit through a first isolation driving circuit. The PWMB1 and PWMA1 signals respectively output from the PWMB1 and PWMA1 signal ends of the main control unit are connected to the grid electrodes of the power tube Q1 and the power tube Q3 through a first isolation driving circuit to serve as control of a BUCK step-down circuit; the PWMA2 and PWMB2 signals output by the PWMA2 and PWMB2 signal terminals of the main control unit are connected to the gates of the power tube Q2 and the power tube Q4 through the first isolation driving circuit, and are used as control of the BOOST circuit. The signals PWMA1 and PWMB1 are 180 degrees, the signals PWMA2 and PWMB2 are 180 degrees, the signals PWMA1, PWMB1 and PWMA2 and PWMB2 are PWM signals with the same frequency, synchronization and the same dead zone, and the signals are used as PWM control of a staggered parallel circuit of BUCK and BOOST, so that high-power bidirectional transmission output can be realized, and PWM signals of an upper main power tube Q1, a main power tube Q3, a lower main power tube Q2 and a main power tube Q4 are 180 degrees in operation, and reliable operation can be realized at any moment or in a critical energy conversion mode.
The main control unit comprises a first PWM control chip IC1, a second PWM control chip IC2, a timing capacitor CT, a timing resistor RT and a dead zone resistor RD, wherein pins 4, 5, 6 and 7 of the first control chip IC1 of the main control unit are mutually connected with pins 4, 5, 6 and 7 of the second control chip IC2, and pins 5, 6 and 7 share the timing capacitor CT, the timing resistor RT and the dead zone resistor RD, so that PWM wave control of accurate synchronous frequency and dead zone time can be realized. The bidirectional energy storage circuit supporting the power failure maintaining function realizes closed-loop control of buck and boost by sending two groups of synchronous PWM waves with the same frequency output by the main control unit IC1 and the main control unit IC2 to the bidirectional DC/DC main circuit, and completes bidirectional energy transfer.
In addition, the second power supply circuit acquires the voltage on the energy storage module to perform isolation conversion to supply power to the second isolation driving circuit and the auxiliary control unit, the auxiliary control unit is used for controlling the power tube Q5 to be turned on when the charging voltage of the operating BUCK reaches a certain threshold value, the power supply required by the operation to the BOOST discharging voltage to the common PN equipment is turned off in a delayed manner after the power supply is completed, and the power supply is turned off immediately when the BOOST discharging is abnormal or the PN bus is overloaded or short-circuited. The auxiliary control unit, the second isolation driving circuit and the power tube Q5 are used for realizing the conduction control of voltage increase and voltage decrease and the abnormal overload and short-circuit protection control during voltage increase.
The circuit has simple structure, can prevent the direct connection process in abnormal condition in control logic, and the whole circuit architecture can realize the high-power conversion output in an interlaced mode by using the cheapest control device. The BUCK module driving signal and the BOOST module driving signal in the circuit realize the same frequency and synchronous control connection, and the upper tube driving signal and the lower tube driving signal of the BUCK circuit and the BOOST circuit are 180 degrees, so that the switching loss can be greatly reduced, the reliability of the whole machine is improved, and the BUCK-BOOST circuit is particularly suitable for completing the power-off rollback function in equipment manufacturing.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a bi-directional tank circuit supporting a power down hold function provided in one embodiment of the present invention;
fig. 2 is a specific circuit diagram of a master control unit according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the present invention, unless otherwise indicated, the meaning of "a plurality", "a number" or "a plurality" is two or more.
Example 1
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a bidirectional energy storage circuit supporting a power failure holding function, and in particular relates to a bidirectional energy storage circuit with high-power high-low voltage energy conversion, the circuit includes a bidirectional DC/DC main circuit, an energy storage module, a main control unit, a first isolation driving circuit and a sampling circuit, one end of the bidirectional DC/DC main circuit is a PN bus end, the other end of the bidirectional DC/DC main circuit is connected with the energy storage module, the sampling circuit is used for collecting PN bus voltages (i.e. voltages between P1 and N) and transmitting the PN bus voltages to the main control unit, and the main control unit is used for receiving the PN bus voltages collected by the sampling circuit, outputting multiple PWM signals which are respectively and correspondingly supplied to gates of a plurality of main power tubes of the bidirectional DC/DC main circuit through the first isolation driving circuit.
One end of the bidirectional DC/DC main circuit is connected with the P1 end and the N end, the other end of the bidirectional DC/DC main circuit is connected with the P2 end and the N2 end, one end of the energy storage module is connected with the P2 end, and the other end of the energy storage module is connected with the N2 end.
The sampling circuit is used for collecting PN bus voltage (namely voltage between P1 and N) and energy storage module output end voltage (namely voltage between P2 and N2).
Furthermore, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a PN bus box, wherein a PN bus end of the bidirectional DC/DC main circuit is connected with the PN bus box, and is respectively connected with a power grid and external PN bus equipment (namely electric equipment sharing buses) through the PN bus box.
Further, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a second isolation driving circuit, an auxiliary control unit and a switching tube Q5, wherein the switching tube Q5 is used for controlling on-off between the other end of the bidirectional DC/DC main circuit and the energy storage module, a grid electrode of the switching tube Q5 is connected with the auxiliary control unit through the second isolation driving circuit, when the bidirectional DC/DC main circuit operates in a BUCK mode and charging voltage (namely voltage between P2 and N2) reaches a certain threshold value, the auxiliary control unit is used for controlling the switching tube Q5 to be conducted through the second isolation driving circuit, when electric equipment of a common bus is subjected to required processing operation, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off in a time delay or to be turned off instantly through the second isolation driving circuit, and when the bidirectional DC/DC main circuit operates in a BOOST mode and a discharging abnormality or PN bus is overloaded or short-circuited, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off instantly through the second isolation driving circuit. The auxiliary control unit can adopt logic circuits such as MCU, singlechip and the like.
The first isolation driving circuit is a circuit for receiving PWM signals of the main control unit and driving the power tube.
The second isolation driving circuit is a circuit for receiving a control signal of the auxiliary control unit and driving the switching tube.
The auxiliary control unit may or may not include an instruction input module for inputting instructions by a user.
Further, the bidirectional energy storage circuit supporting the power failure maintaining function further comprises a first power circuit for supplying power to the main control unit, the first isolation driving circuit and the sampling circuit, and a second power circuit for supplying power to the second isolation driving circuit and the auxiliary control unit, wherein the input end of the first power circuit is connected with the PN bus end (namely, the power is supplied to the first power circuit through the voltage of the PN bus end), and the input end of the second power circuit is connected with the output end of the energy storage module.
Further, the bidirectional DC/DC main circuit includes four main power transistors, where a source of the main power transistor Q1 is connected to a drain of the main power transistor Q2 and one end of the first inductor, a source of the main power transistor Q3 is connected to a drain of the main power transistor Q4 and one end of the second inductor, a drain of the main power transistor Q1 and a drain of the main power transistor Q3 are connected to the P1 end, a source of the main power transistor Q2 and a source of the main power transistor Q4 are connected to the N1 end, a gate of the main power transistor Q1, a gate of the main power transistor Q2, a gate of the main power transistor Q3 and a gate of the main power transistor Q4 are connected to the second PWM signal output end PWMB1, the third PWM signal output end PWMA2, the first PWM signal output end PWMA1 and the fourth PWM signal output end PWMB2 of the main control unit, another end of the first inductor and another end of the second inductor are connected to the source of the switch transistor Q5, and the drain of the switch transistor Q5 is connected to the P2 end. The first inductor and the second inductor form an inductor L1.
Further, the first PWM signal output end of the main control unit outputs a PWMA1 signal, the second PWM signal output end of the main control unit outputs a PWMB1 signal, the third PWM signal output end of the main control unit outputs a PWMA2 signal, and the fourth PWM signal output end of the main control unit outputs a PWMB2 signal;
the PWMA1 signal and the PWMB1 signal are 180 degrees;
the PWMA2 signal and the PWMB2 signal are 180 degrees;
the PWMA1 signal, the PWMB1 signal, the PWMA2 signal and the PWMB2 signal are PWM signals with the same frequency, synchronization and the same dead zone;
and PWM signals of the upper tube main power tube Q1 and the main power tube Q3, the lower tube main power tube Q2 and the main power tube Q4 in the bidirectional DC/DC main circuit operation are 180 degrees.
Further, a first diode (such as a freewheeling diode) is connected between the source electrode and the drain electrode of each main power tube, the cathode of the first diode is connected with the drain electrode of the corresponding main power tube, and the anode of the first diode is connected with the source electrode of the corresponding main power tube; a second diode (such as a freewheeling diode) is connected between the source and the drain of the switching tube Q5, the cathode of the second diode is connected with the drain of the switching tube Q5, and the anode of the second diode is connected with the source of the switching tube Q5.
Further, a second PWM signal output terminal PWMB1 and a first PWM signal output terminal PWMA1 of the main control unit are respectively connected with a gate of a main power tube Q1 and a gate of a main power tube Q3 of the bidirectional DC/DC main circuit through a first isolation driving circuit, and form a BUCK circuit in BUCK staggered mode with a first diode connected with a drain-source electrode of the main power tube Q4 and a first diode connected with a drain-source electrode of the main power tube Q2 and a first inductor;
the third PWM signal output terminal PWMB2 and the fourth PWM signal output terminal PWMB2 of the main control unit are respectively connected with the gate of the main power tube Q4 and the gate of the main power tube Q2 of the bidirectional DC/DC main circuit through the first isolation driving circuit, and form a BOOST circuit in BOOST staggered mode with the first inductor, the second inductor, the first diode connected with the drain and source of the main power tube Q3, and the first diode connected with the drain and source of the main power tube Q1.
Further, the main control unit comprises a first PWM control chip IC1, a second PWM control chip IC2, a timing capacitor CT, a timing resistor RT and a dead zone resistor RD, wherein one end of the timing capacitor CT is connected with a CT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with an RT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with the GND, one end of the dead zone resistor RD is connected with the CT pin of the second PWM control chip IC2, and the other end of the dead zone resistor RD is connected with a DISCH pin of the second PWM control chip IC 2; the OSC pin of the second PWM control chip IC2 is connected to the OSC pin of the first PWM control chip IC1, the CT pin of the second PWM control chip IC2 is connected to the CT pin of the first PWM control chip IC1, the RT pin of the second PWM control chip IC2 is connected to the RT pin of the first PWM control chip IC1, the DISCH pin of the second PWM control chip IC2 is connected to the DISCH pin of the first PWM control chip IC1, the OUTA pin of the first PWM control chip IC1 is the first PWM signal output end PWMA1 of the master control unit, the OUTB pin of the first PWM control chip IC1 is the second PWM signal output end PWMB1 of the master control unit, the OUTA pin of the second PWM control chip IC2 is the third PWM signal output end PWMA2 of the master control unit, the OUTB pin of the second PWM control chip IC2 is the fourth PWM signal output end PWMB2 of the master control unit, the OUTA and the OUTA pin output signals of the first PWM control chip IC1 are 180 degrees, and the OUTA pin of the OUTA and the output signals of the mutual PWM pins of the second PWM control chip IC2 are 180 degrees.
In some embodiments, the first PWM control chip IC1 and the second PWM control chip IC2 are UC3525 or equally functional chips. At this time, one end of the timing capacitor CT is connected to the 5 th pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected to the 6 th pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected to the GND, one end of the dead zone resistor RD is connected to the 5 th pin of the second PWM control chip IC2, and the other end of the dead zone resistor RD is connected to the 7 th pin of the second PWM control chip IC 2; the 4 th pin of the second PWM control chip IC2 is connected with the 4 th pin of the first PWM control chip IC1, the 5 th pin of the second PWM control chip IC2 is connected with the 5 th pin of the first PWM control chip IC1, the 6 th pin of the second PWM control chip IC2 is connected with the 6 th pin of the first PWM control chip IC1, the 7 th pin of the second PWM control chip IC2 is connected with the 7 th pin of the first PWM control chip IC1, the 11 th pin of the first PWM control chip IC1 is a first PWM signal output end PWMA1 of the main control unit, the 14 th pin of the first PWM control chip IC1 is a second PWM signal output end PWMB1 of the main control unit, the 11 th pin of the second PWM control chip IC2 is a third PWM signal output end PWMA2 of the main control unit, the 14 th pin of the second PWM control chip IC2 is a fourth PWM signal output end PWMB2 of the main control unit, the 11 th pin and 14 th pin of the first PWM control chip IC1 are mutually 180 degrees, and the 14 th pin of the second PWM control chip IC2 is mutually 180 degrees.
The invention connects pins 4, 5, 6 and 7 of the first control IC1 of the main control unit with pins 4, 5, 6 and 7 of the second control IC2, and pins 5, 6 and 7 share the timing capacitor CT, the timing resistor RT and the dead zone resistor RD, thereby realizing PWM wave control of precise synchronous frequency and dead zone time.
Further, at least one capacitor is connected in series between the P1 terminal and the N terminal. In some embodiments, a capacitor C2 and a capacitor C3 are connected in series between the P1 end and the N end, one end of the capacitor C2 is connected with the P1 end, the other end of the capacitor C2 is connected with one end of the capacitor C3, and the other end of the capacitor C3 is connected with the N end.
Further, at least one capacitor is connected in series between the P2 terminal and the N2 terminal. In some embodiments, a capacitor C4 is connected in series between the P2 terminal and the N2 terminal, one end of the capacitor C4 is connected to the P2 terminal, and the other end of the capacitor C4 is connected to the N2 terminal.
Further, a resistor RL1 is connected in series between the N terminal and the N1 terminal. In some embodiments, one end of the resistor RL1 is connected to the N terminal, and the other end of the resistor RL1 is connected to the N1 terminal.
Further, a resistor RL2 is connected in series between the N1 terminal and the N2 terminal. In some embodiments, one end of the resistor RL2 is connected to the N1 end, and the other end of the resistor RL1 is connected to the N2 end.
The sampling circuit is also used for collecting the current flowing through the resistor RL1 and the current flowing through the resistor RL2 and judging the conditions of uniform charging and floating charging.
Example two
The embodiment of the invention also discloses a control method of the bidirectional energy storage circuit supporting the power failure maintaining function, which comprises the following steps:
the sampling circuit collects PN bus voltage and transmits the PN bus voltage to the main control unit;
the main control unit receives PN bus voltage acquired by the sampling circuit and compares the PN bus voltage with a set threshold value;
when the PN bus voltage is greater than or equal to a first threshold (for example, 480v, the first threshold can be set according to the requirement), the main control unit outputs PWM signals which are 180 degrees each other to alternately chopper and control the main power tube Q1 and the main power tube Q3 of the bidirectional DC/DC main circuit, and the bidirectional DC/DC main circuit is controlled to operate in a BUCK BUCK mode to charge the energy storage module;
when the PN bus voltage is smaller than or equal to a second threshold (for example, 460V, the second threshold can be set according to the requirement), the main control unit outputs PWM signals which are 180 degrees from each other to alternately chopper and control the main power tube Q2 and the main power tube Q4 of the bidirectional DC/DC main circuit, the main control unit controls the bidirectional DC/DC main circuit to be converted into a BOOST mode, and the energy of the energy storage module is controlled to be fed back to the PN bus end to continuously supply power to the PN bus.
Further, the other end of the bidirectional DC/DC main circuit is provided with a switching tube Q5 for controlling on-off between the bidirectional DC/DC main circuit and the energy storage module;
when the bidirectional DC/DC main circuit operates in the BUCK mode, if the switching tube Q5 is in an off state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module in a constant current manner through a diode connected with the drain and the source of the switching tube Q5;
if the switching tube Q5 is in a conducting state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module through the switching tube Q5.
When the energy storage module electric quantity is full, the BUCK circuit is converted into an intermittent floating charging state, namely, whether the energy storage module electric quantity (judged according to P2 and N2 voltages) is equal to a set value (the electric quantity after the energy storage module electric quantity is full) is judged, and if the energy storage module electric quantity is smaller than the set value, namely, the electric quantity after the energy storage module is full is reduced, the energy storage module is charged again, so that the electric quantity of the energy storage module is full.
When the electric equipment of the common bus completes the required processing operation, the auxiliary control unit outputs a delay turn-off control signal to the switching tube Q5 through the second isolation driving circuit, and the switching tube Q5 is controlled to be turned off in a delay mode.
Specifically, referring to fig. 1 and 2, a PWMB1 signal at pin 14 of an IC1 of a main control unit is sent to a gate of a main power tube Q1 of a bidirectional DC/DC main circuit through a first isolation driving circuit, a PWMA1 signal at pin 11 of the IC1 is sent to a gate of a main power tube Q3 of the bidirectional DC/DC main circuit through the first isolation driving circuit, diodes connected in parallel with an inductor L1 and drain-source electrodes of main power tubes Q2 and Q4 form a BUCK circuit in a BUCK staggered mode, PWM signals which are 180 degrees each other alternately chop the main power tubes Q1 and Q3 in the BUCK mode, and the energy storage module is charged with constant current through the inductor L1 and the drain-source built-in diode of a switching tube Q5, when the second power circuit is charged, the second power circuit starts to supply power to the auxiliary control unit and the like, the switching tube Q5 is triggered to be turned on, the rectifying loss of the diode is reduced in the charging process until the energy storage module is fully charged, and the BUCK circuit is converted into an intermittent floating state; the PWMB2 signal of the 14 pin of the IC2 is sent to the grid electrode of the main power tube Q4 of the bidirectional DC/DC main circuit through the first isolation driving circuit, the PWMA2 signal of the 11 pin of the IC2 is sent to the grid electrode of the main power tube Q2 of the bidirectional DC/DC main circuit through the first isolation driving circuit, and forms a BOOST circuit of a BOOST staggered mode together with the inductor L1 and diodes connected in parallel with the drain and source electrodes of the main power tubes Q3 and Q1, when the PN bus voltage drops to a certain threshold value or a power grid is powered down, the circuit is converted into the BOOST mode, PWM signals which are 180 degrees and are sent by the IC2 chip alternately chop the main power tubes Q2 and Q4, at the moment, the energy L1 of the energy storage module is boosted to the PN bus through the built-in diodes of the drain and source electrodes of the main power tubes Q1 and Q3, power is continuously supplied to the PN bus, when the electric equipment of the auxiliary bus finishes the required processing operation, a delay turn-off control signal is output to the switch tube Q5, the delay turn-off control unit is controlled, the switch tube Q5 is delayed, and the energy of the energy storage module is stored for recycling.
In the embodiment of the invention, the power tube and the switching tube can be switching devices such as IGBT tubes or MOS tubes. The operation principle of the control chips IC1 and IC2 in the main control unit 14 in the bidirectional tank circuit is not described again. The master control unit 14 is preferably a UC3525 or an equivalent functional chip, and may also be any other type of programmable logic device, such as a DSP (Digital Signal Processor ), a single chip microcomputer, or a PLC (Programmable Logic Controller ), but is not limited thereto.
The invention provides a bidirectional energy storage circuit supporting a power failure maintaining function and a control method thereof, and aims to solve the problems that the prior art has a plurality of control devices, is high in cost and cannot be used as an independent product.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A support two-way tank circuit of power failure keep function which characterized in that: the power supply comprises a bidirectional DC/DC main circuit, an energy storage module, a main control unit, a first driving circuit and a sampling circuit, wherein one end of the bidirectional DC/DC main circuit is a PN bus end, the other end of the bidirectional DC/DC main circuit is connected with the energy storage module, the sampling circuit is used for collecting PN bus voltage and transmitting the PN bus voltage to the main control unit, the main control unit is used for receiving the PN bus voltage collected by the sampling circuit, and outputting multipath PWM signals which are respectively and correspondingly transmitted to grids of a plurality of main power tubes of the bidirectional DC/DC main circuit through the first driving circuit.
2. The bi-directional tank circuit supporting a power down hold function of claim 1, wherein: the power grid and common bus electric equipment are connected with the power grid and the common bus through the PN bus box respectively.
3. The bi-directional tank circuit supporting a power down hold function of claim 1, wherein: the power supply system further comprises a second driving circuit, an auxiliary control unit and a switching tube Q5 for controlling on-off between the bidirectional DC/DC main circuit and the energy storage module, wherein a grid electrode of the switching tube Q5 is connected with the auxiliary control unit through the second driving circuit, when the bidirectional DC/DC main circuit operates in a BUCK mode and the charging voltage reaches a certain threshold value, the auxiliary control unit is used for controlling the switching tube Q5 to be conducted through the second driving circuit, when electric equipment of the common bus completes required processing operation, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off in a delayed or instant mode through the second driving circuit, and when the bidirectional DC/DC main circuit operates in a BOOST mode and discharges abnormally or a PN bus is overloaded or short-circuited, the auxiliary control unit is used for controlling the switching tube Q5 to be turned off instant through the second driving circuit.
4. The bi-directional tank circuit supporting a power down hold function of claim 3, wherein: the power supply device comprises a main control unit, a sampling circuit, a first driving circuit, a second driving circuit, a PN bus end, an energy storage module and a sampling circuit, and is characterized by further comprising a first power supply circuit for supplying power to the main control unit, the first driving circuit and the sampling circuit and a second power supply circuit for supplying power to the second driving circuit and the auxiliary control unit, wherein the input end of the first power supply circuit is connected with the PN bus end, and the input end of the second power supply circuit is connected with the output end of the energy storage module.
5. The bi-directional tank circuit supporting a power down hold function of claim 3, wherein: the bidirectional DC/DC main circuit comprises four main power tubes, wherein the source electrode of the main power tube Q1 is connected with the drain electrode of the main power tube Q2 and one end of a first inductor, the source electrode of the main power tube Q3 is connected with the drain electrode of the main power tube Q4 and one end of a second inductor, the drain electrode of the main power tube Q1 and the drain electrode of the main power tube Q3 are connected with the P1 end, the source electrode of the main power tube Q2 and the source electrode of the main power tube Q4 are connected with the N1 end, the grid electrode of the main power tube Q1, the grid electrode of the main power tube Q2, the grid electrode of the main power tube Q3 and the grid electrode of the main power tube Q4 are respectively connected with the second PWM signal output end, the third PWM signal output end, the first PWM signal output end and the fourth PWM signal output end of the main control unit through a first driving circuit, the other end of the first inductor and the other end of the second inductor are connected with the source electrode of the switch tube Q5, and the drain electrode of the switch tube Q5 is connected with the P2 end;
the first PWM signal output end of the main control unit outputs a PWMA1 signal, the second PWM signal output end of the main control unit outputs a PWMB1 signal, the third PWM signal output end of the main control unit outputs a PWMA2 signal, and the fourth PWM signal output end of the main control unit outputs a PWMB2 signal;
the PWMA1 signal and the PWMB1 signal are 180 degrees;
the PWMA2 signal and the PWMB2 signal are 180 degrees;
the PWMA1 signal, the PWMB1 signal, the PWMA2 signal and the PWMB2 signal are PWM signals with the same frequency, synchronization and the same dead zone;
in the operation of the bidirectional DC/DC main circuit, PWM signals of the main power tube Q1 and the main power tube Q2 are 180 degrees;
and PWM signals of the main power tube Q3 and the main power tube Q4 in the operation of the bidirectional DC/DC main circuit are 180 degrees.
6. The bi-directional tank circuit supporting a power down hold function of claim 5, wherein: a first diode is connected between the source electrode and the drain electrode of each main power tube, the cathode of the first diode is connected with the drain electrode of the corresponding main power tube, and the anode of the first diode is connected with the source electrode of the corresponding main power tube; a second diode is connected between the source electrode and the drain electrode of the switching tube Q5, the cathode of the second diode is connected with the drain electrode of the switching tube Q5, and the anode of the second diode is connected with the source electrode of the switching tube Q5;
the second PWM signal output end PWMB1 and the first PWM signal output end PWMA1 of the main control unit are respectively connected with the grid electrode of a main power tube Q1 and the grid electrode of a main power tube Q3 of the bidirectional DC/DC main circuit through a first driving circuit, and form a BUCK circuit in a BUCK staggered mode together with a first inductor, a second inductor and a first diode connected with the drain and source electrodes of the main power tube Q2 and a first diode connected with the drain and source electrodes of a main power tube Q4;
the third PWM signal output terminal PWMB2 and the fourth PWM signal output terminal PWMB2 of the main control unit are respectively connected with the gate of the main power tube Q4 and the gate of the main power tube Q2 of the bidirectional DC/DC main circuit through the first driving circuit, and form a BOOST circuit in BOOST staggered mode with the first inductor, the second inductor, the first diode connected with the drain and source of the main power tube Q3, and the first diode connected with the drain and source of the main power tube Q1.
7. The bi-directional tank circuit supporting a power down hold function of claim 5 or 6, wherein: the main control unit comprises a first PWM control chip IC1, a second PWM control chip IC2, a timing capacitor CT, a timing resistor RT and a dead zone resistor RD, wherein one end of the timing capacitor CT is connected with a CT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with an RT pin of the second PWM control chip IC2, the other end of the timing resistor RT is connected with the GND, one end of the dead zone resistor RD is connected with the CT pin of the second PWM control chip IC2, and the other end of the dead zone resistor RD is connected with a DISCH pin of the second PWM control chip IC 2; the OSC pin of the second PWM control chip IC2 is connected to the OSC pin of the first PWM control chip IC1, the CT pin of the second PWM control chip IC2 is connected to the CT pin of the first PWM control chip IC1, the RT pin of the second PWM control chip IC2 is connected to the RT pin of the first PWM control chip IC1, the DISCH pin of the second PWM control chip IC2 is connected to the DISCH pin of the first PWM control chip IC1, the OUTA pin of the first PWM control chip IC1 is the first PWM signal output end PWMA1 of the master control unit, the OUTB pin of the first PWM control chip IC1 is the second PWM signal output end PWMB1 of the master control unit, the OUTA pin of the second PWM control chip IC2 is the third PWM signal output end PWMA2 of the master control unit, the OUTB pin of the second PWM control chip IC2 is the fourth PWM signal output end PWMB2 of the master control unit, the OUTA and the OUTA pin output signals of the first PWM control chip IC1 are 180 degrees, and the OUTA pin of the OUTA and the output signals of the mutual PWM pins of the second PWM control chip IC2 are 180 degrees.
8. The bi-directional tank circuit supporting a power down hold function of claim 5 or 6, wherein: at least one capacitor is connected in series between the P1 end and the N end;
or/and the combination of the two,
at least one capacitor is connected in series between the P2 end and the N2 end;
or/and the combination of the two,
a resistor RL1 is connected in series between the N terminal and the N1 terminal;
or/and the combination of the two,
a resistor RL2 is connected in series between the N1 end and the N2 end.
9. A control method of a bidirectional tank circuit supporting a power down holding function as recited in any one of claims 1 to 8, comprising the steps of:
the sampling circuit collects PN bus voltage and transmits the PN bus voltage to the main control unit;
the main control unit receives PN bus voltage acquired by the sampling circuit and compares the PN bus voltage with a set threshold value;
when PN bus voltage is greater than or equal to a first threshold value, the main control unit outputs PWM signals which are 180 degrees from each other to alternately carry out chopping control on a main power tube Q1 and a main power tube Q3 of the bidirectional DC/DC main circuit, and the bidirectional DC/DC main circuit is controlled to operate in a BUCK BUCK mode to charge the energy storage module;
when the PN bus voltage is smaller than or equal to a second threshold value, the main control unit outputs PWM signals which are 180 degrees from each other to alternately chopper control the main power tube Q2 and the main power tube Q4 of the bidirectional DC/DC main circuit, the main control unit controls the bidirectional DC/DC main circuit to be converted into a BOOST mode, and energy of the energy storage module is controlled to be fed back to the PN bus end to continuously supply power to the PN bus.
10. The control method of the bidirectional tank circuit supporting the power down holding function as recited in claim 9 wherein: the other end of the bidirectional DC/DC main circuit is provided with a switching tube Q5 for controlling on-off between the bidirectional DC/DC main circuit and the energy storage module; when the bidirectional DC/DC main circuit operates in a BUCK mode and the charging voltage reaches a certain threshold value, the switching tube Q5 is controlled to be conducted;
when the bidirectional DC/DC main circuit operates in the BUCK mode, if the switching tube Q5 is in an off state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module in a constant current manner through a diode connected with the drain and the source of the switching tube Q5; if the switching tube Q5 is in a conducting state, the voltage output by the bidirectional DC/DC main circuit charges the energy storage module through the switching tube Q5;
when the bidirectional DC/DC main circuit operates in the BUCK mode, if the electric quantity of the energy storage module is full, the bidirectional DC/DC main circuit is converted into an intermittent floating charge state;
when the electric equipment of the common bus completes the required processing operation, the control switch tube Q5 is turned off in a delayed mode or turned off immediately.
CN202311113561.8A 2023-08-29 2023-08-29 Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof Pending CN117318486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311113561.8A CN117318486A (en) 2023-08-29 2023-08-29 Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311113561.8A CN117318486A (en) 2023-08-29 2023-08-29 Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof

Publications (1)

Publication Number Publication Date
CN117318486A true CN117318486A (en) 2023-12-29

Family

ID=89245320

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311113561.8A Pending CN117318486A (en) 2023-08-29 2023-08-29 Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof

Country Status (1)

Country Link
CN (1) CN117318486A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117811364A (en) * 2024-03-01 2024-04-02 深圳麦格米特电气股份有限公司 Voltage holding circuit and method, power supply circuit and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117811364A (en) * 2024-03-01 2024-04-02 深圳麦格米特电气股份有限公司 Voltage holding circuit and method, power supply circuit and electronic equipment
CN117811364B (en) * 2024-03-01 2024-06-11 深圳麦格米特电气股份有限公司 Voltage holding circuit and method, power supply circuit and electronic equipment

Similar Documents

Publication Publication Date Title
CN103828185B (en) Double; two boost converters for ups system
CN106877661B (en) Bidirectional buck-boost converter
US9520718B2 (en) Uninterruptible power supply circuit
CN100578888C (en) Uninterruptible power supply
EP3624333B1 (en) Shutdown method for photovoltaic module
WO2020228701A1 (en) Photovoltaic inverter, and photovoltaic power generation system for same
CN113629757A (en) Energy storage device, energy storage device control method and photovoltaic system
US20120069604A1 (en) Compact power converter with high efficiency in operation
CN103715746A (en) UPS and DC/DC circuit thereof
CN117318486A (en) Bidirectional energy storage circuit supporting power failure maintaining function and control method thereof
CN102414977A (en) Inverter arrangement having a decoupling switching element
CN115296536B (en) Bidirectional DC-DC converter
CN219875518U (en) Inverter and power supply system
CN205336129U (en) Main and secondary integrative deflector with redundancy protection function
CN116488251A (en) Power supply circuit, power supply circuit control method and energy storage device
CN116418245A (en) Power conversion circuit, control method, power conversion device and photovoltaic power supply system
CN113410898B (en) Power supply system of bidirectional inverter charger
CN103187746B (en) Uninterruptible power supply topology
CN215186036U (en) Multifunctional power supply device for base station
WO2022012421A1 (en) Optical storage converter and control method and apparatus therefor, and computer readable storage medium
CN112803085B (en) Intelligent battery
CN111736081A (en) Multi-port energy semi-closed type transformer substation storage battery charging and discharging test device and method
CN114884045A (en) Direct current power supply system
CN212965337U (en) Multi-port energy semi-closed type substation storage battery charging and discharging testing device
US11509142B2 (en) Electrical power system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination