CN110445387A - A kind of topological structure and control method of forming and capacity dividing power supply - Google Patents

A kind of topological structure and control method of forming and capacity dividing power supply Download PDF

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Publication number
CN110445387A
CN110445387A CN201910614570.2A CN201910614570A CN110445387A CN 110445387 A CN110445387 A CN 110445387A CN 201910614570 A CN201910614570 A CN 201910614570A CN 110445387 A CN110445387 A CN 110445387A
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China
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voltage
switching tube
resonant converter
power supply
switching
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CN201910614570.2A
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CN110445387B (en
Inventor
孙尧
邓国良
许国
陈孝莺
谢诗铭
言书田
栗梅
韩华
王辉
刘永露
但汉兵
熊文静
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Central South University
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Central South University
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion 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
    • H02M3/325—Conversion 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
    • H02M3/335—Conversion 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
    • H02M3/33569—Conversion 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
    • H02M3/33576—Conversion 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
    • H02M3/33584—Bidirectional 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion 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
    • H02M3/325—Conversion 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
    • H02M3/335—Conversion 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
    • H02M3/33569—Conversion 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
    • H02M3/33576—Conversion 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
    • H02M3/33592—Conversion 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 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion 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
    • H02M7/21—Conversion 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
    • H02M7/217—Conversion 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
    • H02M7/219—Conversion 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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion 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
    • H02M7/21—Conversion 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
    • H02M7/217—Conversion 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
    • H02M7/219—Conversion 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
    • H02M7/2195—Conversion 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 the switches being synchronously commutated at the same frequency of the AC input voltage
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies 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

Abstract

The present invention relates to power electronic system control field more particularly to a kind of topological structures and control method of forming and capacity dividing power supply.The present invention is a kind of topological structure of forming and capacity dividing power supply, including three-phase AC/DC rectifier, LLC resonant converter, the electric capacity of voltage regulation C of three-phase AC/DC rectifier outlet sidedIt is in parallel with LLC resonant converter, the electric capacity of voltage regulation C of LLC resonant converter outlet side0In parallel with load battery E, the LLC resonant converter has energy in bidirectional flow and automatic switchover, when switching frequency is not higher than resonance frequency, the constant characteristic of voltage gain；And a kind of control method of forming and capacity dividing power supply, V is pressed with the output of LLC resonant converter0For outer ring, using the input current of three-phase AC/DC rectifier as inner ring；Realize the two-way flow of energy and automatic switchover.

Description

A kind of topological structure and control method of forming and capacity dividing power supply
Technical field
The present invention relates to power electronic system control technology field more particularly to a kind of topology knots of forming and capacity dividing power supply Structure and control method.
Background technique
Forming and capacity dividing is battery last very important process together before factory, i.e., a series of by carrying out to battery Charge and discharge, so that the chemical property of active material is improved and reinforced in battery.Compared with external component capacitive equipment, mesh It is relatively simple that the preceding formation device used on the market is melted into function mostly, only constant-current charge, constant-voltage charge, three kinds of constant-current discharge Plain mode.Forming and capacity dividing power supply is exchange input, direct current output (AC/DC) equipment.Traditional chemical conversion power-supply device is mostly Unidirectional power stream can only charge from forming and capacity dividing power supply toward battery or battery is by forming and capacity dividing corona discharge, cannot be online Realize that the energy of forming and capacity dividing power supply flows to switching.Although in recent years, energy flow direction may be implemented in some forming and capacity dividing power supplys Switching, but need special detection output voltage, judge energy stream compared with output voltage reference value, and through control algolithm To select corresponding system control scheme.Occur the frequent switching of energy flow direction in order to prevent, generally require setting dead zone, Larger fluctuation occurs for output voltage when this will cause energy flow direction switching, extends system transient modelling regulating time.Further, since chemical conversion Partial volume capacitor is commonly used in low pressure, the occasion of high current, and the device stress levels of selection are low, so output voltage threshold limit value Lower, the voltage dead band threshold value of setting is very low, and making the switching of energy flow direction, control algolithm is very complicated in actual implementation, and Handover failure is flowed in case of energy, will cause output voltage mutation, in some instances it may even be possible to be melted into beyond threshold limit value The serious consequences such as power supply damage.
Summary of the invention
(1) technical problems to be solved
Based on the above issues, the present invention provides the topological structure and control method of a kind of forming and capacity dividing power supply, is able to achieve The two-way flow and automatic switchover of energy.
(2) technical solution
Based on above-mentioned technical problem, the present invention provides a kind of topological structure of forming and capacity dividing power supply, which is characterized in that The power supply includes three-phase AC/DC rectifier, LLC resonant converter, the electric capacity of voltage regulation C of three-phase AC/DC rectifier outlet sidedWith LLC resonant converter is in parallel, the electric capacity of voltage regulation C of LLC resonant converter outlet side0It is in parallel with load battery E, the LLC resonance Converter has energy in bidirectional flow and automatic switchover, when switching frequency is not higher than resonance frequency, the constant spy of voltage gain Property；The energy in bidirectional flow and the voltage for automatically switching i.e. battery E are lower than the reference voltage V of LLC resonant converter0 *When, energy Measure forward flow, battery E charging；The voltage of battery E is higher than the reference voltage V of LLC resonant converter0 *When, energy back flowing, Battery E feeds back energy.
Further, the LLC resonant converter includes main circuit and control circuit, and the main circuit includes a resonance Circuit, two switching circuits, a transformer and two ports；Transformer primary side includes by resonant inductance Lr, resonant capacitance Cr1 And Cr2And its resonance circuit of the booster diode composition of reverse parallel connection, by switching tube S1And S2The switching circuit of composition；Transformation The secondary side of device includes by switching tube Q1、Q2、Q3、Q4The switching circuit of composition；First port parallel voltage-stabilizing capacitor Cd, second port is simultaneously Join electric capacity of voltage regulation C0；
The connection relationship of all parts in the main circuit are as follows: in transformer primary side, resonant capacitance Cr1Anode and switch Pipe S1Drain electrode simultaneously with electric capacity of voltage regulation CdAnode be connected, resonant capacitance Cr1Cathode then simultaneously with resonant capacitance Cr2Anode It is connected with the cathode of transformer primary side, switching tube S1Source electrode simultaneously with resonant inductance LrOne end and switching tube S2Drain electrode It is connected, switching tube S2Source electrode and resonant capacitance Cr2Cathode simultaneously with electric capacity of voltage regulation CdCathode be connected, and resonant inductance Lr's The other end is then connected with the anode of transformer primary side, resonant capacitance Cr1、Cr2One booster diode of reverse parallel connection respectively；In The secondary side of transformer, switching tube Q1Drain electrode and switching tube Q2Drain electrode simultaneously with electric capacity of voltage regulation C0Anode be connected, switching tube Q1 Source electrode simultaneously with Circuit Fault on Secondary Transformer anode and switching tube Q3Drain electrode be connected, switching tube Q2Source electrode simultaneously and transformer The cathode and switching tube Q of secondary side4Drain electrode be connected, switching tube Q3Source electrode and switching tube Q4Source electrode simultaneously and electric capacity of voltage regulation C0Cathode be connected.
Further, the control circuit includes controller and driving circuit, and controller is dsp controller, for generating One group of complementary PWM drive signal, the PWM drive signal from controller that driving circuit will receive, by isolation and electricity It is the switching tube S of main circuit after pressure enhancing1、S2、Q1~Q4Driving voltage is provided.
Further, the switching tube S1、S2、Q1~Q4For there are the parasitisms of the body diode of reverse parallel connection and hourglass source electrode The switching tube of capacitor.
Further, the switching tube S1And Q1、Q4Driving signal it is consistent, S2And Q2、Q3Driving signal it is consistent, ignore In the case where dead time, S1And S2Driving signal it is complementary.
Further, the LLC resonant converter open loop operation, when switching frequency is not higher than resonance frequency, input electricity Press VdWith output voltage V0Proportional relationship is not influenced by load variation, can be considered as DCX, i.e.,
Vd=kV0=2nV0
Wherein, k is LLC resonant converter input voltage VdWith output voltage V0Proportionality coefficient, n be transformer no-load voltage ratio.
A kind of control method of the topological structure of the forming and capacity dividing power supply according to, which is characterized in that with the change of LLC resonance The output voltage V of parallel operation0For outer ring, with reference voltage V0 *Difference after comparing is adjusted through PI, obtains the reference value of direct-axis current Id *, using the input current of three-phase AC/DC rectifier as inner ring, direct-axis current I is obtained through Park TransformationdWith quadrature axis current Iq, directly Shaft current IdWith quadrature axis current IqRespectively with the reference value I of direct-axis currentd *With the reference value I of quadrature axis currentq *Compare, error amount warp Respective PI is adjusted, and obtains the control rate under dq reference axis, and PWM modulation module is given in output after Parker inverse transformation, thus control three The switching device of phase AC/DC rectifier adjusts the input voltage V of LLC resonant converterd, to adjust LLC resonant converter Output voltage V0；Work as V0Greater than reference voltage V0 *When, control and regulation make Vd、V0Reduce；Work as V0Less than reference voltage V0 *When, control Adjusting makes Vd、V0Increase.
(3) beneficial effect
Above-mentioned technical proposal of the invention has the advantages that
(1) driving signal of switching tube is consistent when positive and negative operation, is able to achieve the two-way flow of energy and automatic switchover, is not required to The voltage for detecting output loading does not need the control algolithm of switching；
(2) it may be implemented two-way resonance Sofe Switch, i.e. input terminal no-voltage is opened and zero-current switching, output end no-voltage Open-minded, turn-off power loss is opened in reduction, improves whole efficiency, while harmonic wave is greatly reduced, and reduces the interference to other equipment；
(3) synchronous rectification is used, the unsteady flow loss of rectifying part is reduced；
(4) energy back of the battery to power grid, energy saving and battery production cost are realized automatically；
(5) since LLC resonant converter can be equivalent to a proportional component, using LLC resonant converter output voltage Feedback, can be improved load regulation；
(6) it may be implemented to improve input power factor using the closed-loop control to input power network current, reduce to power grid Harmonic pollution；
(7) control structure is simple, cost is relatively low, but control effect is reliable, safety.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 is a kind of topology diagram of forming and capacity dividing power supply of the embodiment of the present invention；
Fig. 2 is a kind of topology diagram of the LLC resonant converter of forming and capacity dividing power supply of the embodiment of the present invention；
Fig. 3 is a kind of control block diagram of forming and capacity dividing power supply of the embodiment of the present invention；
Waveform diagram when Fig. 4 (a) is the LLC resonant converter forward direction work of the embodiment of the present invention；
Waveform diagram when Fig. 4 (b) is the LLC resonant converter reverse operation of the embodiment of the present invention；
Fig. 5 is the LLC resonant converter of the embodiment of the present invention in t0-t6Working condition equivalent circuit diagram；
Fig. 6 is the gain curve figure of the LLC resonant converter of the embodiment of the present invention；
Fig. 7 be backward power flowing under conditions of three-phase AC/DC rectifier input network voltage, input power network current and The waveform diagram of three-phase AC/DC rectifier output DC voltage；
Fig. 8 shows three-phase AC/DC rectifier input network voltage, input electricity when power flow switches to reversed automatically by forward direction The waveform diagram of the waveform and load cell voltage, electric current of net electric current and three-phase AC/DC rectifier output DC voltage.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below Example is not intended to limit the scope of the invention for illustrating the present invention.
The present invention is a kind of topological structure of forming and capacity dividing power supply, as shown in Figure 1, the power supply includes three-phase AC/DC whole Flow device, LLC resonant converter, the electric capacity of voltage regulation C of three-phase AC/DC rectifier outlet sidedIn parallel with LLC resonant converter, LLC is humorous The electric capacity of voltage regulation C of vibration converter outlet side0It is in parallel with load battery E, the LLC resonant converter with energy in bidirectional flow and Automatically switch, when switching frequency is not higher than resonance frequency, the constant characteristic of voltage gain；The energy in bidirectional flow and automatic Switching is that the voltage of battery E is lower than the reference voltage V of LLC resonant converter0 *When, energy forward flow, battery E charging；Battery E Voltage be higher than LLC resonant converter reference voltage V0 *When, energy back flowing, battery E feeds back energy.
The LLC resonant converter includes main circuit and control circuit, as shown in Fig. 2, the main circuit includes one humorous Shake circuit, two switching circuits, a transformer and two ports；Transformer primary side includes by resonant inductance Lr, resonant capacitance Cr1And Cr2And its resonance circuit of the booster diode composition of reverse parallel connection, by switching tube S1And S2The switching circuit of composition；Become The secondary side of depressor includes by switching tube Q1、Q2、Q3、Q4The switching circuit of composition；First port parallel voltage-stabilizing capacitor Cd, second port Parallel voltage-stabilizing capacitor C0；
The connection relationship of all parts in the main circuit are as follows: in transformer primary side, resonant capacitance Cr1Anode and switch Pipe S1Drain electrode simultaneously with electric capacity of voltage regulation CdAnode be connected, resonant capacitance Cr1Cathode then simultaneously with resonant capacitance Cr2Anode It is connected with the cathode of transformer primary side, switching tube S1Source electrode simultaneously with resonant inductance LrOne end and switching tube S2Drain electrode It is connected, switching tube S2Source electrode and resonant capacitance Cr2Cathode simultaneously with electric capacity of voltage regulation CdCathode be connected, and resonant inductance Lr's The other end is then connected with the anode of transformer primary side, resonant capacitance Cr1、Cr2One booster diode of reverse parallel connection respectively；In The secondary side of transformer, switching tube Q1Drain electrode and switching tube Q2Drain electrode simultaneously with electric capacity of voltage regulation C0Anode be connected, switching tube Q1 Source electrode simultaneously with Circuit Fault on Secondary Transformer anode and switching tube Q3Drain electrode be connected, switching tube Q2Source electrode simultaneously and transformer The cathode and switching tube Q of secondary side4Drain electrode be connected, switching tube Q3Source electrode and switching tube Q4Source electrode simultaneously and electric capacity of voltage regulation C0Cathode be connected.
The switching tube S1、S2、Q1~Q4For there are the switches of antiparallel body diode and the parasitic capacitance of hourglass source electrode Pipe.
The voltage of the first port of LLC resonant converter is Vd, electric current Iin, and the voltage of second port is V0；imFor stream Overexcitation inductance LmElectric current, irTo flow through resonant inductance LrResonance current, IsFor secondary current, IEFor the electricity for flowing through battery E Stream, ur1、ur2Respectively resonant capacitance Cr1、Cr2The voltage at both ends, S1、S2、Q1、Q2、Q3、Q4Respectively represent the door of corresponding MOSFET Pole signal.
A kind of control method of the forming and capacity dividing power supply, as shown in Figure 3, which is characterized in that with LLC resonant converter Output voltage V0For outer ring, with reference voltage V0 *Difference after comparing is adjusted through PI, obtains the reference value I of direct-axis currentd *, with The input current of three-phase AC/DC rectifier is inner ring, obtains direct-axis current I through Park TransformationdWith quadrature axis current Iq, direct-axis current IdWith quadrature axis current IqRespectively with the reference value I of direct-axis currentd *With the reference value I of quadrature axis currentq *Compare, error amount is through respective PI It adjusts, obtains the control rate under dq reference axis, PWM modulation module is given in output after Parker inverse transformation, to control three-phase AC/DC The switching device of rectifier adjusts the input voltage V of LLC resonant converterd, to adjust the output electricity of LLC resonant converter Press V0；Work as V0Greater than reference voltage V0 *When, control and regulation make Vd、V0Reduce；Work as V0Less than reference voltage V0 *When, control and regulation make Vd、V0Increase.
Other than main circuit, LLC resonant converter further includes control circuit, and control circuit includes controller and driving electricity Road, controller are dsp controllers, and for generating one group of complementary PWM drive signal, driving circuit will be received from control The PWM drive signal of device is the switching tube S of main circuit after being isolated and voltage enhances1、S2、Q1~Q4Driving voltage, S are provided1 And Q1、Q4Driving signal it is consistent, S2And Q2、Q3Driving signal it is consistent, S1And S2Driving signal it is complementary, service time is fixed For the half of LLC harmonic period, i.e. MOSFET driving signal is the pulse letter that duty ratio was fixed as 50% (ignoring dead time) Number.
The present embodiment and its circuit topology course of work are as follows:
When forward direction work, as shown in Fig. 4 (a) and Fig. 5, in t0Moment, resonance current irStart from zero increase when, switching tube S1And Q1、Q4It is open-minded simultaneously, if parameter and dead time design are rationally, t0Moment S1Just discharge off can then be realized simultaneously S1No-voltage it is open-minded, according to the voltage-second balance characteristic of inductance, exciting current i before being opened between dead zonemFor negative value, secondary side electricity It flows from Q1、Q4Body diode flow through, Q1、Q4The voltage clamping at both ends is zero, is Q1、Q4No-voltage open and create item Part；Switching frequency is allowed to be less than resonance frequency by adjusting dead time, in t0Moment, S1And Q1、Q4No-voltage is open-minded, irFor sine Signal, exciting current imIt is linearly increasing, secondary side synchronous rectification, until t1Moment, resonance current irWith exciting current imAbsolute value It is equal, secondary current IsIt is zero, due to Q1、Q4Still in opening state, Q1、Q4Electric current is reversed, energy back；In t2It is moment, humorous Shake electric current irWhen reaching zero again by half of harmonic period, switching tube S1And Q1、Q4It simultaneously turns off, at this time S1For zero current pass It is disconnected, and Q1、Q4There are cut-off currents；t2To t3It is dead time, the S of primary side at this time1Junction capacity charging, S2Junction capacity put Electricity, the Q on secondary side1、Q4Junction capacity charging, Q2、Q3Junction capacity electric discharge, primary current be less than secondary current, the Q on secondary side1、Q4's Junction capacity first charges and finishes, Q2、Q3Body diode conducting, therefore Q2、Q3No-voltage conducting may be implemented；If parameter and dead The design of area's time is reasonable, in t3Moment S2Discharge off, S2No-voltage conducting may be implemented；Half of switch periods waveform symmetry afterwards, Principle is also identical.
When reverse operation, shown in the waveform diagram of LLC resonant converter such as Fig. 4 (b), in t0-t6Working condition equivalent circuit Figure is as when positive work shown in fig. 5, but resonance current irWith secondary current IsOn the contrary, in t when direction and positive work0 Moment, secondary current IsStart from zero increase when, switching tube S1And Q1、Q4It is open-minded simultaneously, if parameter and dead time design are closed Reason, t0Moment Q1、Q4Just discharge off can then realize Q simultaneously1、Q4No-voltage it is open-minded, due to exciting current in dead time imFor negative value, with resonance current irIt is equal, S1Electric discharge is completed before opening, S1The voltage clamping at both ends is zero, is S1Zero Voltage, which is opened, to be created condition；Switching frequency is allowed to be less than resonance frequency by adjusting dead time, in t0Moment, S1And Q1、Q4Zero Voltage is open-minded, IsFor sinusoidal signal, exciting current imIt is linearly increasing, until t1Moment, secondary current Is1/n times with excitation electricity Flow imAbsolute value it is equal, resonance current irIt is zero, due to S1Still in opening state, S1Electric current is reversed, energy back；In t2When It carves, secondary current IsWhen reaching zero again by half of harmonic period, switching tube S1And Q1、Q4It simultaneously turns off, at this time Q1、Q4It is zero Switch off current, and S1There are cut-off currents；t2To t3It is dead time, the S of primary side at this time1Junction capacity charging, S2Junction capacity Electric discharge, the Q on secondary side1、Q4Junction capacity charging, Q2、Q3Junction capacity electric discharge, due to exciting current i in dead timemFor positive value, With resonance current irIt is equal, the junction capacity elder generation discharge off of the S2 of primary side, S2Body diode conducting, therefore S2It may be implemented zero Voltage turn-on, if parameter and dead time design are rationally, in t3Moment Q2、Q3Discharge off, Q2、Q3No-voltage may be implemented to lead It is logical；Half of switch periods waveform symmetry, principle are also identical afterwards.
Therefore, under the modulation strategy " with opening with pass ", the driving signal of LLC resonant converter is constant, LLC resonant converter The two-way flow of energy energy and automatic switchover, when the voltage of load battery E is lower than reference voltage V0 *When, power supply energy forward flow, Battery E charging；When the voltage of load battery E is higher than reference voltage V0 *When, power supply energy reverse flow, battery E is fed back to power grid Energy.
Due to LLC resonant converter positive-negative half-cycle waveform symmetry, so when being run here with LLC resonant converter forward direction Positive half cycle mode is derived.
In t0Moment, S1And Q1、Q4When opening, the differential equation is established:
And Cr1=Cr2=Cr, it solves the differential equation and obtains:
By input-output power conservation principle, have:
R in formula is the equivalent resistance of cell load,
It is obtained by (2) formula:
It will(2) formula of substitution, obtains
(3) formula is substituted into (4) formula, is solved:
Thus, under the modulation strategy of " with opening with pass ", when switching frequency is lower than resonance frequency, LLC resonant converter can be with Realize permanent gain, and permanent gain equally may be implemented in when LLC resonant converter switching frequency is equal to resonance frequency, therefore, switch When frequency is not higher than resonance frequency, permanent gain is may be implemented in LLC resonant converter, and LLC resonant converter is considered as LLC- DCX, the output voltage V of three-phase AC/DC rectifierdWith the output voltage V of LLC resonant converter0Proportional relationship, is not loaded The influence of variation, i.e.,
Vd=kV0=2nV0
Wherein, k is LLC resonant converter input voltage VdWith output voltage V0Proportionality coefficient, n be transformer no-load voltage ratio.
Accordingly, gain curve when resonance frequency is higher than in conjunction with FHA (fundamental wave approximate analysis method) available switching frequency Figure, so that it is as shown in Figure 6 using voltage gain curve when " with opening with pass " modulation strategy to obtain LLC resonant converter.
(battery feed back to power grid energy) three-phase AC/DC rectifier input network voltage under conditions of backward power flowing, The waveform diagram for inputting power network current and three-phase AC/DC rectifier output DC voltage is as shown in Figure 7；Power flow is by positive (power grid Charge to battery) reversed (battery feeds back energy to power grid) Shi Sanxiang AC/DC rectifier input network voltage, input are switched to automatically Waveform diagram such as Fig. 8 of the waveform and load cell voltage, electric current of power network current and three-phase AC/DC rectifier output DC voltage It is shown.
In summary, it by the topological structure and control method of a kind of above-mentioned forming and capacity dividing power supply, has the advantages that
(1) driving signal of switching tube is consistent when positive and negative operation, is able to achieve the two-way flow of energy and automatic switchover, is not required to The voltage for detecting output loading does not need the control algolithm of switching；
(2) it may be implemented two-way resonance Sofe Switch, i.e. input terminal no-voltage is opened and zero-current switching, output end no-voltage Open-minded, turn-off power loss is opened in reduction, improves whole efficiency, while harmonic wave is greatly reduced, and reduces the interference to other equipment；
(3) synchronous rectification is used, the unsteady flow loss of rectifying part is reduced；
(4) energy back of the battery to power grid, energy saving and battery production cost are realized automatically；
(5) since LLC resonant converter can be equivalent to a proportional component, using LLC resonant converter output voltage Feedback, can be improved load regulation；
(6) it may be implemented to improve input power factor using the closed-loop control to input power network current, reduce to power grid Harmonic pollution；
(7) control structure is simple, cost is relatively low, but control effect is reliable, safety.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Embodiments of the present invention are described in conjunction with the accompanying, but those skilled in the art can not depart from spirit and model of the invention Various modifications and variations are made in the case where enclosing, such modifications and variations each fall within the range being defined by the appended claims Within.

Claims (7)

1. a kind of topological structure of forming and capacity dividing power supply, which is characterized in that the power supply includes three-phase AC/DC rectifier, LLC Controlled resonant converter, the electric capacity of voltage regulation C of three-phase AC/DC rectifier outlet sidedIt is in parallel with LLC resonant converter, LLC resonant converter The electric capacity of voltage regulation C of outlet side0In parallel with load battery E, the LLC resonant converter has energy in bidirectional flow and cuts automatically It changes, when switching frequency is not higher than resonance frequency, the constant characteristic of voltage gain；The energy in bidirectional flow and automatic switchover be The voltage of battery E is lower than the reference voltage V of LLC resonant converter0 *When, energy forward flow, battery E charging；The voltage of battery E Higher than the reference voltage V of LLC resonant converter0 *When, energy back flowing, battery E feeds back energy.
2. a kind of topological structure of forming and capacity dividing power supply according to claim 1, which is characterized in that the LLC resonance Converter includes main circuit and control circuit, and the main circuit includes a resonance circuit, two switching circuits, a transformer With two ports；Transformer primary side includes by resonant inductance Lr, resonant capacitance Cr1And Cr2And its booster diode of reverse parallel connection The resonance circuit of composition, by switching tube S1And S2The switching circuit of composition；The secondary side of transformer includes by switching tube Q1、Q2、Q3、Q4 The switching circuit of composition；First port parallel voltage-stabilizing capacitor Cd, second port parallel voltage-stabilizing capacitor C0；
The connection relationship of all parts in the main circuit are as follows: in transformer primary side, resonant capacitance Cr1Anode and switching tube S1 Drain electrode simultaneously with electric capacity of voltage regulation CdAnode be connected, resonant capacitance Cr1Cathode then simultaneously with resonant capacitance Cr2Anode and change The cathode of depressor primary side is connected, switching tube S1Source electrode simultaneously with resonant inductance LrOne end and switching tube S2Drain electrode be connected, Switching tube S2Source electrode and resonant capacitance Cr2Cathode simultaneously with electric capacity of voltage regulation CdCathode be connected, and resonant inductance LrIt is another End is then connected with the anode of transformer primary side, resonant capacitance Cr1、Cr2One booster diode of reverse parallel connection respectively；In transformation The secondary side of device, switching tube Q1Drain electrode and switching tube Q2Drain electrode simultaneously with electric capacity of voltage regulation C0Anode be connected, switching tube Q1Source Pole simultaneously with Circuit Fault on Secondary Transformer anode and switching tube Q3Drain electrode be connected, switching tube Q2Source electrode simultaneously and transformer secondary The cathode and switching tube Q of side4Drain electrode be connected, switching tube Q3Source electrode and switching tube Q4Source electrode simultaneously with electric capacity of voltage regulation C0's Cathode is connected.
3. a kind of topological structure of forming and capacity dividing power supply according to claim 2, which is characterized in that the control circuit Including controller and driving circuit, controller is dsp controller, for generating one group of complementary PWM drive signal, driving circuit The PWM drive signal from controller that will be received is the switching tube S of main circuit after being isolated and voltage enhances1、S2、Q1 ~Q4Driving voltage is provided.
4. a kind of topological structure of forming and capacity dividing power supply according to claim 2, which is characterized in that the switching tube S1、 S2、Q1~Q4For there are the switching tubes of the body diode of reverse parallel connection and the parasitic capacitance of hourglass source electrode.
5. a kind of topological structure of forming and capacity dividing power supply according to claim 2, which is characterized in that the switching tube S1 And Q1、Q4Driving signal it is consistent, S2And Q2、Q3Driving signal it is consistent, in the case where ignoring dead time, S1And S2Driving Signal is complementary.
6. a kind of topological structure of forming and capacity dividing power supply according to claim 1, which is characterized in that the LLC resonance Converter open loop operation, when switching frequency is not higher than resonance frequency, input voltage VdWith output voltage V0Proportional relationship, no It is influenced by load variation, can be considered as DCX, i.e.,
Vd=kV0=2nV0
Wherein, k is LLC resonant converter input voltage VdWith output voltage V0Proportionality coefficient, n be transformer no-load voltage ratio.
7. a kind of control method of the topological structure of forming and capacity dividing power supply according to claim 1 to 6, special Sign is, with the output voltage V of LLC resonant converter0For outer ring, with reference voltage V0 *Difference after comparing is adjusted through PI, is obtained To the reference value I of direct-axis currentd *, using the input current of three-phase AC/DC rectifier as inner ring, direct-axis current is obtained through Park Transformation IdWith quadrature axis current Iq, direct-axis current IdWith quadrature axis current IqRespectively with the reference value I of direct-axis currentd *With the reference of quadrature axis current Value Iq *Compare, error amount is adjusted through respective PI, obtains the control rate under dq reference axis, and PWM tune is given in output after Parker inverse transformation Molding block adjusts the input voltage V of LLC resonant converter to control the switching device of three-phase AC/DC rectifierd, to adjust Save the output voltage V of LLC resonant converter0；Work as V0Greater than reference voltage V0 *When, control and regulation make Vd、V0Reduce；Work as V0It is less than Reference voltage V0 *When, control and regulation make Vd、V0Increase.
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CN115102407A (en) * 2022-07-18 2022-09-23 东莞光亚智能科技有限公司 DAB converter for battery formation and capacity grading and control method thereof
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