CN110620517A - Parallel input and serial output aging power supply device - Google Patents

Parallel input and serial output aging power supply device Download PDF

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Publication number
CN110620517A
CN110620517A CN201910931064.6A CN201910931064A CN110620517A CN 110620517 A CN110620517 A CN 110620517A CN 201910931064 A CN201910931064 A CN 201910931064A CN 110620517 A CN110620517 A CN 110620517A
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current
output
converter circuit
voltage
mosfet
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CN201910931064.6A
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CN110620517B (en
Inventor
但汉兵
曾鹏
胡子恒
粟梅
孙尧
王辉
刘永露
熊文静
徐菁涛
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Central South University
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Central South University
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1582Buck-boost converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1584Conversion 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 with a plurality of power processing stages connected in parallel
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/219Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • H02M1/0058Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0083Converters characterised by their input or output configuration
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1584Conversion 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 with a plurality of power processing stages connected in parallel
    • H02M3/1586Conversion 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 with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The invention discloses an aging power supply device with parallel input and series output, belonging to the field of power electronic system control. The invention mainly comprises a host, a slave, a power supply module, a load device, a display panel, a control panel, a first fan, a second fan, a first thermistor and a second thermistor module. The host is connected with the input end of the slave in parallel, and the host is connected with the power grid of the power supply module after being connected with the input end of the slave in parallel. The output of the master machine is connected with the output of the slave machine in series and then connected with the load device, and the output of the master machine is connected with the load device in series and then connected with the load device to serve as the output end of the aging power supply device, so that input parallel connection and output series connection are achieved. The internal topological structures of the host and the slave are the same, and the internal topological structures of the host and the slave comprise three control circuits, namely a single-phase AC/DC converter circuit, an isolation LLC resonant converter circuit and a bidirectional BUCK-BOOST converter circuit. The invention can flow energy in two directions, does not pollute the power grid, and has the advantages of small loss, low cost, good reliability and practicability.

Description

Parallel input and serial output aging power supply device
Technical Field
The invention belongs to the field of power electronic system control, and particularly relates to an aging power supply device.
Background
Energy saving and emission reduction is being vigorously implemented in the present country, and the national standard of electric automobile is gone out, encourages to develop electric automobile, and green trip, 2015 is the beginning of electric automobile high-speed development, and a large amount of electric automobile will appear in the market, rather than supporting charger, fill electric pile demand very big, for satisfying the market demand, specially release electric automobile machine that charges and its energy-conserving ageing device.
On one hand, the requirement of automobile manufacturers on the configured chargers is met, on the other hand, the problem of aging of other charger manufacturers is solved, as the power of the electric automobile charger is high, a large amount of electric energy is consumed when the electric automobile charger leaves a factory and is aged, the electric energy is converted into heat energy, the environmental temperature is high, fire easily occurs, the current of an electric wire of an aging room is high when the electric automobile charger is aged, the electric wire is seriously heated and is easy to trip, and the energy-saving aging device well solves the problems and accords with the national energy-saving emission-.
At present, the main problems of the aging test equipment are as follows:
(1) the most original discharging mode, though simple and cheap, causes huge waste of energy, which is contrary to the theme of energy saving and environmental protection in the world. Meanwhile, the heat dissipation of the resistance discharge device is difficult to process, the aging power consumption and the large current are large, the lead is serious in empty development heat, and the dangers such as fire, electrical short circuit and the like are easily caused. In addition, resistance discharge also makes it difficult to achieve continuous regulation of the discharge current.
(2) The constant voltage discharge mode is adopted, the discharge current of a common inverter on the market is slightly smaller than the constant current value of the charger, although the mode can feed the energy of the charger back to the power grid, the constant voltage mode is difficult to simulate the state that the charger is in constant current charging for a long time but the output voltage is slightly lower than the nominal value.
Therefore, in order to reduce energy consumption, reduce the volume of the device to improve power density and save cost, and meanwhile, in order to better simulate the aging characteristic of the charger power supply, an aging power supply device with parallel input and serial output is also needed at present, so that the performance index and reliability of the aging power supply device are improved, the application scale of the aging power supply device is promoted, and the application cost of the aging power supply device is further reduced.
Disclosure of Invention
The invention discloses an aging power supply device with parallel input and series output, which aims to solve the technical problems that: the energy can flow in two directions, the energy can be fed back to a power grid efficiently, and high power factor is realized, so that loss is reduced, pollution to the power grid is avoided, meanwhile, the host and the slave are connected in parallel, input and series output and are in an internally staggered mode, the size of the device is reduced remarkably, the power density of the device is improved, the cost of the aging power supply device is reduced, in addition, a constant voltage mode and a constant current mode are provided, the aging characteristic of the power supply is simulated better, and the reliability and the practicability of the aging power supply device are improved.
The invention also discloses a control method of the aging power supply device for controlling the aging power supply device with parallel input and series output, which can efficiently feed energy back to the power grid and realize high power factor, thereby reducing loss and harmonic pollution to the power grid; in addition, two modes of constant voltage and constant current can be provided, the aging characteristic of the power supply can be better simulated, and the reliability and the practicability of the aging power supply testing device are improved.
The purpose of the invention is realized by the following technical scheme:
the invention discloses an aging power supply device with parallel input and serial output, which mainly comprises a host, a slave, a power supply module, a load device, a display panel, a control panel, a first fan, a second fan, a first thermistor and a second thermistor module. The main machine is connected with the input end of the slave machine in parallel, and the main machine is connected with the power grid of the power supply module after being connected with the input end of the slave machine in parallel. The output of the master machine is connected with the output of the slave machine in series and then connected with the load device, and the output of the master machine is connected with the load device in series and then connected with the load device to serve as the output end of the aging power supply device with parallel input and series output, so that input and parallel output series connection is realized. The internal topological structure of the master machine and the slave machine is the same, namely the internal topological structure of the master machine comprises three control circuits, namely a single-phase AC/DC converter circuit, an isolation LLC resonant converter circuit and a bidirectional BUCK-BOOST converter circuit, and the internal topological structure of the slave machine comprises three control circuits, namely the single-phase AC/DC converter circuit, the isolation LLC resonant converter circuit and the bidirectional BUCK-BOOST converter circuit.
Preferably, the host and the slave are transmitted through a signal communication module, the host is connected with the display panel, the display panel is connected with the upper computer through a communication protocol, and the control panel generates a control signal to correspondingly control the host and the slave.
Preferably, the first fan and the second fan are used for radiating heat for the master machine and the slave machine. In addition, the host and the slave sense the temperature of the device through the first thermistor and the second thermistor respectively, then transmit the temperature signal to the host to realize temperature control, and if the temperature is overhigh due to abnormality, trigger protection to avoid larger loss.
Preferably, the master machine and the slave machine have the same internal topology structure, and energy bidirectional flow is realized through bidirectional switch switching in the internal topology structure, that is, the master machine and the slave machine form an isolated AC-DC module for energy bidirectional flow, so that the aging power supply device with parallel input and serial output can efficiently feed back energy to a power grid. When energy flows in the forward direction, the AC end is input, the DC end is output, when the energy flows in the reverse direction, the AC end is output, the DC end is input, and the performance of the module is not influenced when voltage is reversely irrigated through the bidirectional property of the module.
Preferably, when the DC terminal is used as the output, the output voltage range is direct current 200-.
Preferably, the input end of the power supply module is connected to 220V single-phase alternating current, and the output end of the power supply module is connected to the input ends of the master machine and the slave machine.
Preferably, the single-phase AC/DC converter circuit includes a primary DC bus capacitor and two sets of DC/DC converter circuits connected in parallel, where the two sets of DC/DC converter circuits connected in parallel are respectively a first DC/DC converter circuit and a second DC/DC converter circuit. The first DC/DC converter circuit and the second DC/DC converter circuit are topologically identical.
The DC/DC converter circuit comprises an isolation LLC resonance converter circuit, a secondary side direct current bus capacitor, a bidirectional BUCK-BOOST converter circuit and a BUCK output capacitor.
In the host, an input end of the single-phase AC/DC converter circuit is connected to an output end of a power supply module, an output end of the single-phase AC/DC converter circuit is connected with the primary side direct current bus capacitor, and input ends of the first DC/DC converter circuit and the second DC/DC converter circuit are connected in parallel with the primary side direct current bus capacitor.
The single-phase AC/DC converter circuit is a full-bridge rectification circuit, the full-bridge rectification circuit comprises a first IGBT, a second IGBT, a third IGBT and a fourth IGBT, and two ends of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT are connected with a diode in an anti-parallel mode.
The collector electrode of the first IGBT is connected with the collector electrode of the second IGBT, the emitter electrode of the third IGBT is connected with the emitter electrode of the fourth IGBT, the emitter electrode of the first IGBT is connected with the collector electrode of the third IGBT, and the emitter electrode of the second IGBT is connected with the collector electrode of the fourth IGBT.
The input voltage of the single-phase AC/DC converter circuit is 220V single-phase alternating current, and the output voltage is direct current.
Preferably, the isolated LLC resonant converter circuit includes a first H-bridge circuit, a primary side resonant capacitor, a transformer, and a second H-bridge circuit.
The first H-bridge circuit comprises a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET, the drain electrode of the first MOSFET is connected with the drain electrode of the second MOSFET, the source electrode of the third MOSFET is connected with the source electrode of the fourth MOSFET, the source electrode of the first MOSFET is connected with the drain electrode of the third MOSFET, and the source electrode of the second MOSFET is connected with the drain electrode of the fourth MOSFET.
The input end of the first H-bridge circuit is connected with a primary side direct current bus capacitor, the primary side resonance capacitor is connected in series between the output end of the first H-bridge circuit and the primary side of the transformer, and the turn ratio of the primary side to the secondary side of the transformer is 25: 30.
the second H-bridge circuit comprises a fifth MOSFET, a sixth MOSFET, a seventh MOSFET and an eighth MOSFET, wherein the drain electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET, the source electrode of the seventh MOSFET is connected with the source electrode of the eighth MOSFET, the source electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET, and the source electrode of the sixth MOSFET is connected with the drain electrode of the eighth MOSFET.
The input end of the second H-bridge circuit is connected with the secondary side of the transformer, and the output end of the second H-bridge circuit is connected with the secondary side direct current bus capacitor.
The input voltage of the isolation LLC resonant converter circuit is 375V direct current, the output voltage is 450V direct current, and the output power is 2.5 KW.
The BUCK converter circuit comprises a fifth IGBT, a sixth IGBT and a BUCK inductor, and two ends of the fifth IGBT and two ends of the sixth IGBT are connected with a diode in parallel in an inverse mode.
The collector electrode of the fifth IGBT is connected with the drain electrode of the fifth MOSFET, the emitter electrode of the sixth IGBT is connected with the source electrode of the eighth MOSFET, the emitter electrode of the fifth IGBT is connected with the collector electrode of the sixth IGBT, and the BUCK inductor is connected with the emitter electrode of the fifth IGBT in series.
Preferably, the output end of the bidirectional BUCK-BOOST converter circuit is connected to the BUCK output capacitor, the input voltage of the bidirectional BUCK-BOOST converter circuit is DC 450V, the output current is 10A when the output voltage is 100-.
The invention also discloses a control method of the aging power supply testing device, which is used for controlling the aging power supply device with parallel input and serial output, and comprises a control method of a single-phase AC/DC converter circuit, an open-loop control method adopted by an LLC resonant converter and a control method of a bidirectional BUCK-BOOST converter circuit, wherein the three parts are as follows:
part one: the control method of the single-phase AC/DC converter circuit comprises the following steps:
step 1.1: a double closed loop control method of a single-phase AC/DC converter circuit adopting a voltage outer loop current inner loop is characterized in that firstly, a DC bus voltage obtained by a sampling circuit is utilized, and then a filtered DC bus voltage U is obtained by a wave trapdc1And is compared with a reference value Udc1 *Comparing, obtaining the reference value I of the current amplitude of the internal current loop through the PI controllerm *The sampled grid voltage signal usThe phase information cos theta is obtained through the phase-locked loop module, and the product of the phase information cos theta and the phase information is used as a current reference value I of the current inner loops *
Step 1.2: obtaining the actual value I of the current of the power grid by using a sampling circuitsIt is used as a current reference value I of a feedback signal and a current inner loops *After comparison, the single-phase AC/DC converter is obtained by a PR controllerControl signal of circuit, sampled network voltage signal usAnd as feedforward, obtaining a driving signal of a switching tube of the single-phase AC/DC converter circuit through the PWM modulator.
The transfer function of the PR controller is as follows:
wherein Kp、KrProportional and harmonic coefficients, ω, of the PR controller, respectivelycIs the cut-off frequency, ω, of the PR controller0Is the resonant frequency of the PR controller.
And part two: the LLC resonant converter adopts an open-loop control method as follows:
the LLC resonant converter adopts open-loop control, energy transmitted from a high-voltage side to a low-voltage side of the LLC resonant converter is defined as forward transmission, a circuit on the high-voltage side of the transformer is defined as a primary side, and a circuit on the low-voltage side of the transformer is defined as a secondary side. The positive flow of the specified energy is from the primary side to the secondary side; in order to realize zero current switching-on and switching-off, the resonant converter works in a current discontinuous mode, and the switching period is set to be TsWith a resonance period of TrSatisfy Ts>Tr
The positive and negative conduction of the primary side switching tube are the same, and in order to prevent the switch from conducting by mistake, proper dead time needs to be inserted; taking forward energy transmission as an example, the control strategy of the switching tube in a single period is as follows:
firstly, in the positive half period, the primary side switching tube acts to obtain the voltage of the primary side as VHVControlling the action of the corresponding switch tube of the secondary side to make the voltage of the secondary side be VLVVoltage of resonant capacitor VcrIncrease, resonant current iLrIncrease, resonant current iLrWhen the voltage increases to the peak value, the voltage V of the resonant capacitorcrIncrease from negative voltage to zero, resonant current iLrStarting to decrease, the resonant capacitor voltage VcrThe resonant current is reduced to zero and the resonant capacitor voltage V is increasedcrIncreasing to peak value, turning off the secondary switch tube to realize zero current switch of the secondary switch tubeWhen the power is off and the negative half period comes, the primary side switching tube acts to obtain the primary side voltage of-VHVThe secondary side switch tube acts to obtain a corresponding voltage of-VLVThe primary side and the secondary side are simultaneously switched on, because the resonant current is zero at the moment, the zero current switching-on of the primary side switching tube and the secondary side switching tube is realized, the resonant current generated in the period is opposite to the polarity of the positive half period, after the resonant current is reduced to zero, the secondary side switching tube is switched off, the zero current switching-off of the secondary side switching tube is realized, so that the control of the switching tube in a single period is completed, and the next period is controlled according to the control strategy of the switching tube in the single period; by adopting the control strategy, the loss of the circuit can be reduced, and the requirement of voltage boosting and reducing can be met.
The power of the resonant converter operating in discontinuous mode is as follows:
in the formula:n is transformer transformation ratio, A is resonance current peak value, Vdc2Is the secondary side voltage, TsFor a switching period, ir(t) is a resonance current.
The LLC resonant converter adopts an open-loop control method to realize high power factor, thereby reducing loss and harmonic pollution to a power grid.
And part three: the control method of the bidirectional BUCK-BOOST converter circuit comprises the following steps:
step 3.1: under the constant voltage mode, the bidirectional BUCK-BOOST converter circuits of the master machine and the slave machine are controlled by adopting double closed loops of a voltage outer loop and a current inner loop so as to output a desired output voltage Uo *As reference signal, the actual output voltage U of the bidirectional BUCK-BOOST converter circuitoComparing the feedback signal with a reference signal to obtain a reference value I of the current through a PI controllerL *Respectively converting the actual output current values I of the two BUCK-BOOST converter circuitsL1,IL2Is compared with a current reference valueThe PI controller obtains a control signal and samples the actual output voltage UoAnd as feedforward, a driving signal of the switching tube is obtained through the PWM module.
Step 3.2: under the constant current mode, the bidirectional BUCK-BOOST converter circuit of the host machine is controlled by a single current loop, and the bidirectional BUCK-BOOST converter circuit of the slave machine is controlled by a double closed loop of a voltage outer loop and a current inner loop. The bidirectional BUCK-BOOST converter circuit of the host adopts single current loop control as follows: the output current I of the host machineo1As a feedback signal, with a current reference value Io *Comparing the control signals obtained by the PI controller, and converting the actual output voltage U of the host bidirectional BUCK-BOOST converter circuito1And as feedforward, obtaining driving signals of the switching tubes of the two-way BUCK-BOOST converter circuits of the host machine through a PWM (pulse-width modulation) modulator. The bidirectional BUCK-BOOST converter circuit of the slave machine adopts double closed-loop control of a voltage outer loop and a current inner loop as follows: converting the output voltage U of the hosto1And the output voltage U of the slaveo2After comparison, the current reference value is added to the PI controller to be Io *And after actual output currents of the two-way bidirectional BUCK-BOOST converter circuits of the slave are compared with the set values of the current loops, the actual output voltages of the two-way bidirectional BUCK-BOOST converter circuits of the slave are taken as feedforward signals, and driving signals of switch tubes of the two-way bidirectional BUCK-BOOST converter circuits of the slave are obtained through a PWM (pulse width modulation) modulator.
Step 3.3: and phase-shifting the drive signals of the switching tubes of the two bidirectional BUCK-BOOST converter circuits obtained by the PWM module by 180 degrees to realize staggered parallel connection.
Has the advantages that:
1. the invention discloses an aging power supply device with parallel input and series output, which improves the flexibility of an aging power supply testing device by connecting input ends in parallel and connecting output ends in series or in parallel according to requirements, can realize energy bidirectional flow between an alternating current side and a direct current side, and has the characteristics of high efficiency and isolation, thereby achieving the purposes of reducing loss and improving reliability.
2. The invention discloses an aging power supply device with parallel input and series output, and also discloses a control method of an aging power supply testing device, which is used for controlling the aging power supply device with parallel input and series output, so that the aging power supply device with parallel input and series output has the following advantages:
(1) the voltage of the direct-current bus is kept constant by carrying out double closed-loop control on a single-phase AC/DC converter circuit connected with a power grid and the direct-current bus, wherein a current loop in the double closed-loop control adopts a quasi-PR controller and can realize error-free tracking on a sinusoidal reference current signal, so that a unit power factor can be realized on the side of the alternating-current power grid, and meanwhile, a multiple harmonic compensation strategy is added into the PR controller, so that the fluctuation of the frequency of the power grid and the distortion of grid-connected current caused at a non-fundamental frequency position are inhibited, and the harmonic pollution to the power grid is reduced;
(2) by adopting an open-loop control method, the series LLC resonant converter works in an intermittent mode, zero-voltage switching-on of a primary side switching tube and zero-current switching-off of a secondary side switching tube can be realized, the switching loss of the circuit is reduced, and the requirement of boosting between a direct-current bus and the input of a bidirectional BUCK-BOOST converter circuit is met;
(3) when the bidirectional BUCK-BOOST converter works in a constant voltage mode, the host and the slave adopt double closed-loop control of a voltage outer ring and a current inner ring to realize wide-range voltage regulation of direct current side output, when the bidirectional BUCK-BOOST converter works in a constant current mode, the host adopts single current ring control, the output voltage value of the host is used as a reference value of a voltage ring of the slave, double closed-loop control of the slave is constructed, power equalization of the host and the slave in the constant current mode is realized, meanwhile, the phase of a switching tube driving signal of two bidirectional BUCK-BOOST converters is shifted by 180 degrees, staggered parallel connection is realized, ripple waves of output current are reduced, and the quality of the output current is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 shows an overall hardware connection configuration block diagram of an aging power supply apparatus according to an embodiment of the present invention;
fig. 2 is a block diagram showing an overall circuit connection structure of a master and a slave parallel input and series output of the aging power supply apparatus according to an embodiment of the present invention.
FIG. 3 shows a block diagram of a system architecture of a degraded power supply apparatus according to an embodiment of the invention;
fig. 4 shows a system overall control block diagram of the aging power supply apparatus according to an embodiment of the present invention;
FIG. 5 shows a control block diagram of two bi-directional BUCK-BOOST converters;
FIG. 6 shows waveforms of rectifier input grid voltage, input grid current and rectifier output DC voltage under conditions of forward power flow (grid transferring energy to battery load);
fig. 7 shows the output current and total current waveforms of the bidirectional BUCK-BOOST converter 1 and the bidirectional BUCK-BOOST converter 2 under conditions of forward power flow (grid transferring energy to battery load).
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1:
as shown in fig. 1, the method for controlling an aging power supply device disclosed in this embodiment is used to control an aging power supply device with parallel input and serial output, and comprises a host, a slave, a power supply module, a load device, a display panel, a control panel, a fan, and a thermistor module.
The internal topological structures of a host and a slave of the aging power supply device with parallel input and series output are the same, the input ends of the host and the slave are connected in parallel and connected with a power grid of a power supply module, and the output ends of the host and the slave are connected in series through the output of the host and the output of the slave and then connected with the load device, so that input, parallel output and series connection are realized.
The host machine is communicated with the slave machine through CAN transmission control signals, the host machine is connected with the display panel, the display panel is connected with an upper computer through 485, the RS485 CAN remotely control the setting and the function of the module and provide detailed test records, alarming, abnormal records and the like, and the control panel generates control signals to correspondingly control the host machine and the slave machine so as to realize each function of the system device.
The heat dissipation of the host and the slave is realized by the control power supply provided by the main circuit, in addition, the system senses the temperature of the device through the first thermistor and the second thermistor, and then transmits a temperature signal to the host to realize temperature control, and if the temperature is overhigh due to abnormality, the device can be protected to avoid larger loss.
As shown in fig. 2, a system hardware block diagram of an aging power supply apparatus according to an embodiment of the present invention is shown.
The single-phase AC/DC converter circuit is a full-bridge rectification circuit, the full-bridge rectification circuit comprises a first IGBT, a second IGBT, a third IGBT and a fourth IGBT, and two ends of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT are connected with a diode in an anti-parallel mode;
the collector of the first IGBT is connected with the collector of the second IGBT, the emitter of the third IGBT is connected with the emitter of the fourth IGBT, the emitter of the first IGBT is connected with the collector of the third IGBT, and the emitter of the second IGBT is connected with the collector of the fourth IGBT;
the input voltage of the single-phase AC/DC converter circuit is 220V single-phase alternating current, the output voltage is 375V direct current, and the output power is 5 KW.
The isolation LLC resonant converter circuit comprises a first H-bridge circuit, a primary side resonant capacitor, a transformer and a second H-bridge circuit;
the first H-bridge circuit comprises a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET, wherein the drain electrode of the first MOSFET is connected with the drain electrode of the second MOSFET, the source electrode of the third MOSFET is connected with the source electrode of the fourth MOSFET, the source electrode of the first MOSFET is connected with the drain electrode of the third MOSFET, and the source electrode of the second MOSFET is connected with the drain electrode of the fourth MOSFET;
the input end of the first H-bridge circuit is connected with a primary side direct current bus capacitor, the primary side resonance capacitor is connected in series between the output end of the first H-bridge circuit and the primary side of the transformer, and the turn ratio of the primary side to the secondary side of the transformer is 25: 30, of a nitrogen-containing gas;
the second H-bridge circuit comprises a fifth MOSFET, a sixth MOSFET, a seventh MOSFET and an eighth MOSFET, wherein the drain electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET, the source electrode of the seventh MOSFET is connected with the source electrode of the eighth MOSFET, the source electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET, and the source electrode of the sixth MOSFET is connected with the drain electrode of the eighth MOSFET;
the input end of the second H-bridge circuit is connected with the secondary side of the transformer, and the output end of the second H-bridge circuit is connected with the secondary side direct current bus capacitor;
the input voltage of the isolation LLC resonant converter circuit is 375V direct current, the output voltage is 450V direct current, and the output power is 2.5 KW.
The BUCK converter circuit comprises a fifth IGBT, a sixth IGBT and a BUCK inductor, wherein two ends of the fifth IGBT and two ends of the sixth IGBT are connected with a diode in an anti-parallel mode;
a collector of the fifth IGBT is connected with a drain of the fifth MOSFET, an emitter of the sixth IGBT is connected with a source of the eighth MOSFET, an emitter of the fifth IGBT is connected with the collector of the sixth IGBT, and the BUCK inductor is connected with the emitter of the fifth IGBT in series;
the output end of the BUCK converter circuit is connected with a BUCK output capacitor, the input voltage of the BUCK converter circuit is direct current 450V, when the output voltage is 100-200V, the output current is 10A, when the output voltage is 200-425V, the output power is 2KW, and the phase angles of the output currents of the BUCK converter circuit of the first DC/DC converter circuit and the BUCK converter circuit of the second DC/DC converter circuit are staggered, so that the output current ripple is smaller.
The term "anti-parallel connection" refers to that the collector of the IGBT power device is connected with the cathode of the diode, and the emitter of the IGBT power device is connected with the anode of the diode.
As shown in fig. 3, there is a block diagram showing a configuration of a system of the aging power supply apparatus according to an embodiment of the present invention.
When energy flows in the forward direction, the voltage of a single-phase alternating-current power grid is taken as an input side, alternating current is rectified into direct current through an AC/DC converter circuit, the voltage of a primary direct-current bus is obtained and is used as the input voltage of a lower-level LLC resonant converter circuit, the output voltage is obtained through the resonant converter and is the voltage of a secondary direct-current bus, the secondary direct-current bus is used as the input voltage of a lower-level BUCK converter circuit, and the final expected voltage is obtained after the voltage of the lower-level BUCK converter;
when the direct current side is connected with a power supply, energy flows reversely, on one hand, the direct current power supply charges a BUCK output capacitor of the BUCK circuit, and on the other hand, the residual energy is fed back to a power grid through the LLC resonant converter and the AC/DC converter circuit;
when the DC end is used for outputting, the output voltage range is direct current 200 plus 400V, the output current can reach 20A, when the output voltage range is 400 plus 850V, the output power can reach 8KW, the constant current and constant voltage mode can be realized, the load size and the load mode can be manually/remotely switched by software, and the energy can flow in two directions;
as shown in fig. 4, a block diagram of an aging power supply apparatus system according to an embodiment of the present invention is shown.
The control method for the aging power supply device disclosed by the embodiment is used for controlling the aging power supply device with parallel input and serial output, and comprises three parts, namely a control method for a single-phase AC/DC converter circuit, an open-loop control method for an LLC resonant converter and a control method for a bidirectional BUCK-BOOST converter circuit:
part one: the control method of the single-phase AC/DC converter circuit comprises the following steps:
step 1.1: single phase AC/DCThe converter circuit adopts a double closed-loop control method of a voltage outer loop and a current inner loop, firstly, a DC bus voltage obtained by a sampling circuit is utilized, and then a filtered DC bus voltage U is obtained by a trapdc1And is compared with a reference value Udc1 *Comparing, obtaining the reference value I of the current amplitude of the internal current loop through the PI controllerm *The sampled grid voltage signal usThe phase information cos theta is obtained through the phase-locked loop module, and the product of the phase information cos theta and the phase information is used as a current reference value I of the current inner loops *
Step 1.2: obtaining the actual value I of the current of the power grid by using a sampling circuitsIt is used as a current reference value I of a feedback signal and a current inner loops *After comparison, a control signal of the single-phase AC/DC converter circuit is obtained through the PR controller, and a sampled power grid voltage signal u is obtainedsAnd as feedforward, obtaining a driving signal of a switching tube of the single-phase AC/DC converter circuit through the PWM modulator.
The transfer function of the PR controller is as follows:
wherein Kp、KrProportional and harmonic coefficients, ω, of the PR controller, respectivelycIs the cut-off frequency, ω, of the PR controller0Is the resonant frequency of the PR controller.
And part two: the LLC resonant converter adopts an open-loop control method as follows:
the LLC resonant converter adopts open-loop control, energy transmitted from a high-voltage side to a low-voltage side of the LLC resonant converter is defined as forward transmission, a circuit on the high-voltage side of the transformer is defined as a primary side, and a circuit on the low-voltage side of the transformer is defined as a secondary side. The positive flow of the specified energy is from the primary side to the secondary side; in order to realize zero current switching-on and switching-off, the resonant converter works in a current discontinuous mode, and the switching period is set to be TsWith a resonance period of TrSatisfy Ts>Tr
The positive and negative conduction of the primary side switching tube are the same, and in order to prevent the switch from conducting by mistake, proper dead time needs to be inserted; taking forward energy transmission as an example, the control strategy of the switching tube in a single period is as follows:
firstly, in the positive half period, the primary side switching tube acts to obtain the voltage of the primary side as VHVControlling the action of the corresponding switch tube of the secondary side to make the voltage of the secondary side be VLVVoltage of resonant capacitor VcrIncrease, resonant current iLrIncrease, resonant current iLrWhen the voltage increases to the peak value, the voltage V of the resonant capacitorcrIncrease from negative voltage to zero, resonant current iLrStarting to decrease, the resonant capacitor voltage VcrThe resonant current is reduced to zero and the resonant capacitor voltage V is increasedcrIncreasing to a peak value, turning off the secondary switch tube at the moment, realizing zero current turn-off of the secondary switch tube until a negative half period comes, and enabling the primary switch tube to act to obtain a primary voltage of-VHVThe secondary side switch tube acts to obtain a corresponding voltage of-VLVThe primary side and the secondary side are simultaneously switched on, because the resonant current is zero at the moment, the zero current switching-on of the primary side switching tube and the secondary side switching tube is realized, the resonant current generated in the period is opposite to the polarity of the positive half period, after the resonant current is reduced to zero, the secondary side switching tube is switched off, the zero current switching-off of the secondary side switching tube is realized, so that the control of the switching tube in a single period is completed, and the next period is controlled according to the control strategy of the switching tube in the single period; by adopting the control strategy, the loss of the circuit can be reduced, and the requirement of voltage boosting and reducing can be met.
The power of the resonant converter operating in discontinuous mode is as follows:
in the formula:n is transformer transformation ratio, A is resonance current peak value, Vdc2Is the secondary side voltage, TsFor a switching period, ir(t) is a resonance current.
The LLC resonant converter adopts an open-loop control method to realize high power factor, thereby reducing loss and harmonic pollution to a power grid.
And part three: the control method of the bidirectional BUCK-BOOST converter circuit comprises the following steps:
step 3.1: under the constant voltage mode, the bidirectional BUCK-BOOST converter circuits of the master machine and the slave machine are controlled by adopting double closed loops of a voltage outer loop and a current inner loop so as to output a desired output voltage Uo *As reference signal, the actual output voltage U of the bidirectional BUCK-BOOST converter circuitoComparing the feedback signal with a reference signal to obtain a reference value I of the current through a PI controllerL *Respectively converting the actual output current values I of the two bidirectional BUCK-BOOST converter circuitsL1,IL2Comparing with the current reference value, obtaining control signal via PI controller, and sampling the actual output voltage UoAnd as feedforward, a driving signal of the switching tube is obtained through the PWM module.
Step 3.2: under the constant current mode, the bidirectional BUCK-BOOST converter circuit of the host machine is controlled by a single current loop, and the bidirectional BUCK-BOOST converter circuit of the slave machine is controlled by a double closed loop of a voltage outer loop and a current inner loop. The bidirectional BUCK-BOOST converter circuit of the host adopts single current loop control as follows: the output current I of the host machineo1As a feedback signal, with a current reference value Io *Comparing the control signals obtained by the PI controller, and converting the actual output voltage U of the host bidirectional BUCK-BOOST converter circuito1And as feedforward, obtaining driving signals of the switching tubes of the two-way BUCK-BOOST converter circuits of the host machine through a PWM (pulse-width modulation) modulator. The bidirectional BUCK-BOOST converter circuit of the slave machine adopts double closed-loop control of a voltage outer loop and a current inner loop as follows: converting the output voltage U of the hosto1And the output voltage U of the slaveo2After comparison, the current reference value is added to the PI controller to be Io *Obtaining a given value of a current loop of the slave, respectively feeding back actual output currents of two-way bidirectional BUCK-BOOST converter circuits of the slave to be compared with the given value of the current loop, and then using the slave to obtain a feed-forward signalThe actual output voltage of the two bidirectional BUCK-BOOST converter circuits is a feedforward signal, and a driving signal of a switching tube of the two bidirectional BUCK-BOOST converter circuits of the slave is obtained through a PWM (pulse width modulation) modulator.
As shown in fig. 5, step 3.3: and phase-shifting the drive signals of the switching tubes of the two bidirectional BUCK-BOOST converter circuits obtained by the PWM module by 180 degrees to realize staggered parallel connection.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (8)

1. The utility model provides an ageing power supply unit of parallel input series output which characterized in that: the system mainly comprises a host, a slave, a power supply module, a load device, a display panel, a control panel, a first fan, a second fan, a first thermistor and a second thermistor module; the host is connected with the input end of the slave in parallel, and the host is connected with the power grid of the power supply module after being connected with the input end of the slave in parallel; the output of the master machine is connected with the output of the slave machine in series and then connected with the load device, and the output of the master machine is connected with the load device in series and then connected with the load device to serve as the output end of the aging power supply device with parallel input and series output, so that input and parallel output series connection is realized; the internal topological structure of the master machine and the slave machine is the same, namely the internal topological structure of the master machine comprises three control circuits, namely a single-phase AC/DC converter circuit, an isolation LLC resonant converter circuit and a bidirectional BUCK-BOOST converter circuit, and the internal topological structure of the slave machine comprises three control circuits, namely the single-phase AC/DC converter circuit, the isolation LLC resonant converter circuit and the bidirectional BUCK-BOOST converter circuit.
2. A parallel-input-series-output aging power supply device according to claim 1, characterized in that: the host machine is connected with the display panel through a communication protocol, and the control panel correspondingly controls the host machine and the slave machine by generating control signals;
the first fan and the second fan are used for radiating heat for the host and the slave; in addition, the host and the slave sense the temperature of the device through the first thermistor and the second thermistor respectively, then transmit the temperature signal to the host to realize temperature control, and if the temperature is overhigh due to abnormality, trigger protection to avoid larger loss.
3. A parallel-input-series-output aging power supply device according to claim 2, characterized in that: because the internal topological structures of the master machine and the slave machine are the same, energy bidirectional flow is realized through bidirectional switch switching in the internal topological structure, namely, the master machine and the slave machine form an isolated AC-DC module with energy bidirectional flow, and the aging power supply device with parallel input and serial output can efficiently feed back energy to a power grid; when energy flows forwards, the AC end is input, the DC end is output, when energy flows backwards, the AC end is output, the DC end is input, and the performance of the module is not influenced when voltage is reversely irrigated through the bidirectional energy fluidity of the module.
4. A parallel-input-series-output aging power supply device according to claim 3, characterized in that: the single-phase AC/DC converter circuit comprises a primary side direct current bus capacitor and two groups of DC/DC converter circuits which are connected in parallel, wherein the two groups of DC/DC converter circuits which are connected in parallel are respectively a first DC/DC converter circuit and a second DC/DC converter circuit; the first DC/DC converter circuit and the second DC/DC converter circuit are in the same topological structure;
the DC/DC converter circuit comprises an isolation LLC resonance converter circuit, a secondary side direct current bus capacitor, a bidirectional BUCK-BOOST converter circuit and a BUCK output capacitor;
in the host, the input end of the single-phase AC/DC converter circuit is connected to the output end of the power supply module, the output end of the single-phase AC/DC converter circuit is connected with the primary side direct current bus capacitor, and the input ends of the first DC/DC converter circuit and the second DC/DC converter circuit are connected in parallel with the primary side direct current bus capacitor;
the single-phase AC/DC converter circuit is a full-bridge rectification circuit, the full-bridge rectification circuit comprises a first IGBT, a second IGBT, a third IGBT and a fourth IGBT, and two ends of the first IGBT, the second IGBT, the third IGBT and the fourth IGBT are connected with a diode in an anti-parallel mode;
the collector electrode of the first IGBT is connected with the collector electrode of the second IGBT, the emitter electrode of the third IGBT is connected with the emitter electrode of the fourth IGBT, the emitter electrode of the first IGBT is connected with the collector electrode of the third IGBT, and the emitter electrode of the second IGBT is connected with the collector electrode of the fourth IGBT.
5. A parallel-input-series-output aging power supply device according to claim 4, wherein: the isolation LLC resonant converter circuit comprises a first H-bridge circuit, a primary side resonant capacitor, a transformer and a second H-bridge circuit;
the first H-bridge circuit comprises a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET, wherein the drain electrode of the first MOSFET is connected with the drain electrode of the second MOSFET, the source electrode of the third MOSFET is connected with the source electrode of the fourth MOSFET, the source electrode of the first MOSFET is connected with the drain electrode of the third MOSFET, and the source electrode of the second MOSFET is connected with the drain electrode of the fourth MOSFET;
the input end of the first H-bridge circuit is connected with a primary side direct current bus capacitor, the primary side resonance capacitor is connected in series between the output end of the first H-bridge circuit and the primary side of the transformer, and the turn ratio of the primary side to the secondary side of the transformer is 25: 30, of a nitrogen-containing gas;
the second H-bridge circuit comprises a fifth MOSFET, a sixth MOSFET, a seventh MOSFET and an eighth MOSFET, wherein the drain electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET, the source electrode of the seventh MOSFET is connected with the source electrode of the eighth MOSFET, the source electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET, and the source electrode of the sixth MOSFET is connected with the drain electrode of the eighth MOSFET;
the input end of the second H-bridge circuit is connected with the secondary side of the transformer, and the output end of the second H-bridge circuit is connected with the secondary side direct current bus capacitor.
6. A parallel-input-series-output aging power supply device according to claim 5, wherein: the BUCK converter circuit comprises a fifth IGBT, a sixth IGBT and a BUCK inductor, wherein two ends of the fifth IGBT and two ends of the sixth IGBT are connected with a diode in parallel in an inverted mode;
the collector electrode of the fifth IGBT is connected with the drain electrode of the fifth MOSFET, the emitter electrode of the sixth IGBT is connected with the source electrode of the eighth MOSFET, the emitter electrode of the fifth IGBT is connected with the collector electrode of the sixth IGBT, and the BUCK inductor is connected with the emitter electrode of the fifth IGBT in series.
7. A parallel-input-series-output aging power supply device according to claim 6, wherein: the output end of the bidirectional BUCK-BOOST converter circuit is connected with a BUCK output capacitor, the input voltage of the bidirectional BUCK-BOOST converter circuit is 450V direct current, when the output voltage is 100 plus 200V, the output current is 10A, when the output voltage is 200 plus 425V, the output power is 2KW, the phase angle of the output current of the bidirectional BUCK-BOOST converter circuit of the first DC/DC converter circuit and the phase angle of the output current of the bidirectional BUCK-BOOST converter circuit of the second DC/DC converter circuit are staggered, and the output current ripple is smaller.
8. The utility model provides an ageing power supply unit of parallel input series output which characterized in that: the control method of the aging power supply device comprises a control method of a single-phase AC/DC converter circuit, an open-loop control method adopted by an LLC resonant converter and a control method of a bidirectional BUCK-BOOST converter circuit:
part one: the control method of the single-phase AC/DC converter circuit comprises the following steps:
step 1.1: a double closed loop control method of a single-phase AC/DC converter circuit adopting a voltage outer loop current inner loop is characterized in that firstly, a DC bus voltage obtained by a sampling circuit is utilized, and then a filtered DC bus voltage U is obtained by a wave trapdc1And is compared with a reference value Udc1 *Comparing, obtaining the reference value I of the current amplitude of the internal current loop through the PI controllerm *The sampled grid voltage signal usThe phase information cos theta is obtained through the phase-locked loop module, and the product of the phase information cos theta and the phase information is used as a current reference value I of the current inner loops *
Step 1.2: obtaining the actual value I of the current of the power grid by using a sampling circuitsIt is used as a current reference value I of a feedback signal and a current inner loops *After comparison, a control signal of the single-phase AC/DC converter circuit is obtained through the PR controller, and a sampled power grid voltage signal u is obtainedsAs feedforward, obtaining a driving signal of a switching tube of the single-phase AC/DC converter circuit through a PWM modulator;
the transfer function of the PR controller is as follows:
wherein Kp、KrProportional and harmonic coefficients, ω, of the PR controller, respectivelycIs the cut-off frequency, ω, of the PR controller0Is the resonant frequency of the PR controller;
and part two: the LLC resonant converter adopts an open-loop control method as follows:
the LLC resonant converter adopts open-loop control, energy transmitted from a high-voltage side to a low-voltage side of the LLC resonant converter is defined as forward transmission, a circuit on the high-voltage side of the transformer is defined as a primary side, and a circuit on the low-voltage side of the transformer is defined as a secondary side; the positive flow of the specified energy is from the primary side to the secondary side; in order to realize zero current switching-on and switching-off, the resonant converter works in a current discontinuous mode, and the switching period is set to be TsWith a resonance period of TrSatisfy Ts>Tr
The conduction time of the positive half period and the negative half period of the primary side switching tube is the same, and in order to prevent the switch from conducting by mistake, proper dead time needs to be inserted; taking forward energy transmission as an example, the control strategy of the switching tube in a single period is as follows:
firstly, in the positive half period, the primary side switching tube acts to obtain the voltage of the primary side as VHVControlling the action of the corresponding switch tube of the secondary side to make the voltage of the secondary side be VLVVoltage of resonant capacitor VcrIncrease, resonant current iLrIncrease, resonant current iLrWhen the voltage increases to the peak value, the voltage V of the resonant capacitorcrIncrease from negative voltage to zero, resonant current iLrStarting to decrease, the resonant capacitor voltage VcrThe resonant current is reduced to zero and the resonant capacitor voltage V is increasedcrIncreasing to a peak value, turning off the secondary switch tube at the moment, realizing zero current turn-off of the secondary switch tube until a negative half period comes, and enabling the primary switch tube to act to obtain a primary voltage of-VHVThe secondary side switch tube acts to obtain a corresponding voltage of-VLVThe primary side and the secondary side are simultaneously switched on, because the resonant current is zero at the moment, the zero current switching-on of the primary side switching tube and the secondary side switching tube is realized, the resonant current generated in the period is opposite to the polarity of the positive half period, after the resonant current is reduced to zero, the secondary side switching tube is switched off, the zero current switching-off of the secondary side switching tube is realized, so that the control of the switching tube in a single period is completed, and the next period is controlled according to the control strategy of the switching tube in the single period; by adopting the control strategy, the loss of the circuit can be reduced, and the requirement of boosting can be met;
the power of the resonant converter operating in discontinuous mode is as follows:
in the formula:n is transformer transformation ratio, A is resonance current peak value, Vdc2Is the secondary side voltage, TsFor a switching period, ir(t) is the resonant current;
and part three: the control method of the bidirectional BUCK-BOOST converter circuit comprises the following steps:
step 3.1: under the constant voltage mode, the bidirectional BUCK-BOOST converter circuits of the master machine and the slave machine are controlled by adopting double closed loops of a voltage outer loop and a current inner loop so as to output a desired output voltage Uo *As reference signal, the actual output voltage U of the bidirectional BUCK-BOOST converter circuitoComparing the feedback signal with a reference signal to obtain a reference value I of the current through a PI controllerL *Respectively converting the actual output current values I of the two bidirectional BUCK-BOOST converter circuitsL1,IL2Comparing with the current reference value, obtaining control signal via PI controller, and sampling the actual output voltage UoAs feedforward, a driving signal of a switching tube is obtained through a PWM module;
step 3.2: under a constant current mode, the bidirectional BUCK-BOOST converter circuit of the host machine is controlled by a single current loop, and the bidirectional BUCK-BOOST converter circuit of the slave machine is controlled by a double closed loop of a voltage outer loop and a current inner loop; the bidirectional BUCK-BOOST converter circuit of the host adopts single current loop control as follows: the output current I of the host machineo1As a feedback signal, with a current reference value Io *Comparing the control signals obtained by the PI controller, and converting the actual output voltage U of the host bidirectional BUCK-BOOST converter circuito1As feedforward, drive signals of the switching tubes of the two-way BUCK-BOOST converter circuits of the host are obtained through a PWM (pulse-width modulation) modulator; the bidirectional BUCK-BOOST converter circuit of the slave machine adopts double closed-loop control of a voltage outer loop and a current inner loop as follows: converting the output voltage U of the hosto1And the output voltage U of the slaveo2After comparison, the current reference value is added to the PI controller to be Io *Obtaining a given value of a current loop of the slave, respectively feeding back actual output currents of the two-way bidirectional BUCK-BOOST converter circuits of the slave to be compared with the given value of the current loop, and comparing the actual output currents with the given value of the current loop by using the actual output currents of the two-way bidirectional BUCK-BOOST converter circuits of the slaveThe actual output voltage is a feedforward signal, and a driving signal of a switching tube of two-way BUCK-BOOST converter circuits of the slave is obtained through a PWM (pulse width modulation) modulator;
step 3.3: and phase-shifting the drive signals of the switching tubes of the two bidirectional BUCK-BOOST converter circuits obtained by the PWM module by 180 degrees to realize staggered parallel connection.
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