CN110165895A - A kind of wide gain FB-HB LLC resonant converter circuit structure of realization and control method - Google Patents
A kind of wide gain FB-HB LLC resonant converter circuit structure of realization and control method Download PDFInfo
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- CN110165895A CN110165895A CN201910320199.9A CN201910320199A CN110165895A CN 110165895 A CN110165895 A CN 110165895A CN 201910320199 A CN201910320199 A CN 201910320199A CN 110165895 A CN110165895 A CN 110165895A
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- 230000002459 sustained effect Effects 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 27
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- 238000006243 chemical reaction Methods 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
- H02M3/3353—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 at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- 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 invention discloses a kind of wide gain FB-HB LLC resonant converter circuit structure of realization and control methods, entire controlled resonant converter topological structure is divided into three parts, first part is switching network module, and second part is resonant network module, and Part III is rectifying and wave-filtering network module.The present invention is controlled power switch tube duty ratio by digital control module and realizes dynamic transformation in the case where not turning off controlled resonant converter feeder ear；And in order to realize broader output voltage range, increase the method for winding on secondary side, the power switch by controlling controlled resonant converter pair side is in control suitable output voltage.
Description
Technical field
The present invention relates to full-bridge/LLC half bridge resonant technical fields, and in particular to one kind is based on HB (half-bridge), FB
(full-bridge) LLC (inductance L, capacitor C) controlled resonant converter circuit structure and method realize the broader description of output voltage range.
Background technique
In many applications, controlled resonant converter requires work under wide output state.For example, present electric car charges
Controlled resonant converter output voltage claimed range used in equipment and outdoor illumination equipment is 24V-144V.In order to give power application
Equipment provides stabilizing the output voltage for wide scope, and traditional half-bridge/full-bridge LLC resonant converter is by changing power switch tube
Working frequency changes the gain of controlled resonant converter to control the range of output voltage.This mode control method is easy to implement,
Topological structure is simple, but with the expansion of output voltage range, suitable output voltage values, power switch tube are opened in order to obtain
Closing frequency also can accordingly increase or reduce, and make power switch tube frequency operating points far from resonant frequency point, to will increase humorous
The magnetic core of transformer of vibration converter and the conduction loss of power switch tube, keep entire circuit working efficiency bad.It is humorous in order to improve
The working efficiency of vibration converter, reduces circuit loss, proposes FB (full-bridge)-HB (half-bridge) LLC resonant converter circuit arrangement.
There is typically further an intrinsic problem, i.e. topological transformation processes to occur suddenly for FB-HB LLC resonant converter.
Control for FB-HB LLC resonant converter output voltage range, topology conversion are simply stopped right by cutting off the power
Soft starting circuit is realized afterwards, to obtain desired output voltage values.In the FB-HB LLC resonant converter circuit transformations phase
Between, output voltage can generate serious due to voltage spikes.It will increase the voltage stress of power switch tube and circuit components in this way, produce
Raw additional conduction loss, controlled resonant converter whole efficiency are not significantly improved.It is defeated by increasing output filter capacitor
Voltage transients can reduce out, but will increase unnecessary cost and resonance inverter body product.Generally speaking, it is not able to satisfy
Output voltage realizes consecutive variations within all the period of time.
The prior art increases output voltage range for controlled resonant converter and mostly uses change power switch tube switching frequency greatly
It is realized with the mode for changing power switch tube duty ratio.But broader output voltage range requires broader switching frequency model
It encloses.In general, the switching frequency of wide scope is worthless, because it adversely affects the performance of controlled resonant converter, so that humorous
Converter overall work of shaking is unstable.If controlled resonant converter maintenance is improper also to will affect its service life.
Summary of the invention
The object of the present invention is to provide a kind of realization width gain FB-HB mix control LLC resonant converter circuit structure and
Method is in the case where not cutting off the power, and realizes dynamic become by digital control module come the duty ratio of control switch pipe
It changes；And in order to realize broader output voltage range, increases the method for winding on secondary side, be connected on winding by control
Switch is in control suitable output voltage.
In order to realize above-mentioned task, the invention adopts the following technical scheme:
A kind of circuit structure for realizing wide gain FB-HB LLC resonant converter, including it is sequentially connected switching network, humorous
Vibrating network and rectifying and wave-filtering network, in which:
The switching network includes power switch tube Q1、Q2、Q3、Q4, power switch junction capacitance C1、C2、C3、C4, power
Switching tube body diode D1、D2、D3、D4, input voltage Vin, wherein Q1、Q3After series connection, Q2、Q4After series connection, C1、C3After series connection, C2、
C4V is connected in parallel on after series connectioninBoth ends, C1、C2、C3、C4It is connected in parallel on Q respectively1、Q2、Q3、Q4Both ends；In C1、C3Between take point an A, A
Point is connected to D1、D3Between and Q1、Q3Between；In C2、C4Between take point B, B a point to be connected to D2、D4Between and Q2、Q4It
Between；
The resonant network includes resonant capacitance Cr, resonant inductance LrWith the magnetizing inductance L of transformer primary windingm,
Middle Cr、Lr、LmAfter series connection, one end connection A point, the other end connection B point；
The rectifying and wave-filtering network includes four inductance L of transformer secondary windingS1、LS2、LS3、LS4, freewheeling diode
DR1、DR2、DR3、DR4, power switch tube Q5, filter capacitor Cf, load R and output voltage Vo；Wherein, LS1、LS2、LS3、LS4String
After connection, one end connects DR1Anode, the other end connect DR4Anode；The voltage at the both ends R is output voltage Vo, CfIt is connected in parallel on R two
End；DR2Anode be connected to LS1And LS2Between, DR2Cathode connect CfOne end, CfThe other end be connected to LS2、LS3Between；
DR3Anode be connected to LS3、LS4Between, DR3Cathode connect DR2Cathode, DR4Cathode connect DR1Cathode and Q5Grid
Pole, Q5Source electrode, drain electrode and DR2Cathode connection.
Further, the circuit structure further includes digital control module, and digital control module is driven by light-coupled isolation
Dynamic circuit is separately connected power switch tube Q1、Q2、Q3、Q4And Q5。
A kind of control method for realizing wide gain FB-HB LLC resonant converter, comprising the following steps:
After controlled resonant converter starting, pass through output voltage VoValue judgement should work in various operating modes, method are as follows:
Controlled resonant converter gain M is calculated using given reference value；
As 0.8≤M < 1.2, controlled resonant converter work is in HB LLC resonant converter mode, each power device at this time
Working condition are as follows: Q4It is permanent to open, Q2、Q5It is permanent to close, Q1、Q3Work is in HF switch state；Q1、Q3Complementation conducting, setting
Dead zone is to prevent Q1、Q3It is straight-through；Make Q by digital control module1、Q3Switching frequency operation near resonant frequency point；
As 1.2≤M < 2.4, controlled resonant converter work is in FB LLC resonant converter mode, each power device at this time
Working condition are as follows: Q4Duty ratio be gradient to 50%, Q by 100%2Duty ratio be gradient to 50% by 0, when progressive formation complete
After, Q1、Q2、Q3、Q4Work is in HF switch state, Q5It is permanent to close；Q1、Q3And Q2、Q4Complementary conducting respectively, Q1、Q4And Q2、
Q3It simultaneously turns on and turns off respectively, dead zone is set to prevent Q1、Q3Or Q2、Q4It is straight-through；Make Q by digital control module1、Q2、Q3、
Q4Switching frequency operation near resonant frequency point；
As 2.4≤M < 4.8, controlled resonant converter works in secondary side Multiple coil FB LLC resonant converter mode, at this time respectively
The working condition of power device are as follows: Q1、Q2、Q3、Q4The HF switch state that work is 50% in duty ratio, Q5It is permanent open-minded；Q1、
Q3And Q2、Q4Complementary conducting respectively, Q1、Q4And Q2、Q3It simultaneously turns on and turns off respectively, dead zone is set to prevent Q1、Q3Or Q2、Q4Directly
It is logical；Make Q by digital control module1、Q2、Q3、Q4Switching frequency operation near resonant frequency point.
Further, the calculation formula of the resonant frequency point are as follows:
Further, the given reference value of the utilization calculates controlled resonant converter gain M, specifically:
Controlled resonant converter resonance gain M is output voltage VoMultiplied by the transformer primary pair side turn ratio and input voltage VinRatio
Value.
Further, the specific work process of the HB LLC resonant converter mode are as follows:
(1) HB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Energy transmission is to transformer secondary, sustained diodeR2Conducting, energy transmission to load；
(2) HB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be
Zero, energy can not be transmitted to transformer secondary, sustained diodeR2It is not turned on, loads by filter capacitor CfEnergy is provided；
(3) HB LLC resonant converter switchs mode two
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network pass through Q3And Q4Forming circuit, resonant inductance LrElectric current IrAnd magnetic
Change inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference transfer energy to
Transformer secondary, sustained diodeR3Conducting, energy transmission to load；
(4) HB LLC resonant converter switchs mode two
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network pass through Q3And Q4Forming circuit, resonant inductance LrElectric current IrAnd magnetic
Change inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy without
Method is transmitted to transformer secondary, sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
Further, the FB LLC resonant converter specific work process are as follows:
(1) FB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Energy transmission is to transformer secondary, sustained diodeR2Conducting, energy transmission to load；
(2) FB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference be zero, energy can not be transmitted to transformer secondary, sustained diodeR2It is not turned on, loads by filter capacitor CfEnergy is provided
Amount；
(3) FB LLC resonant converter switchs mode two
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, input voltage VinPass through Q2And Q3It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Energy transmission is to transformer secondary, sustained diodeR3Conducting, energy transmission to load；
(4) FB LLC resonant converter switchs mode two
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, resonant network pass through Q2And Q3Forming circuit, resonant inductance LrElectric current IrAnd magnetic
Change inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy without
Method is transmitted to transformer secondary, sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
Further, the specific work process of the secondary side Multiple coil FB LLC resonant converter mode are as follows:
(1) secondary side Multiple coil FB LLC resonant converter switchs mode one
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Energy transmission is to transformer secondary, sustained diodeR1Conducting, energy transmission to load；
(2) secondary side Multiple coil FB LLC resonant converter switchs mode one
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be
Zero, energy can not be transmitted to transformer secondary, sustained diodeR1It is not turned on, loads by filter capacitor CfEnergy is provided；
(3) secondary side Multiple coil FB LLC resonant converter switchs mode two
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, input voltage VinPass through Q2And Q3It is added on resonant network, resonant inductance Lr's
Electric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Energy transmission is to transformer secondary, sustained diodeR4Conducting, energy transmission to load；
(4) secondary side Multiple coil FB LLC resonant converter switchs mode two
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, resonant network pass through Q2And Q3Forming circuit, resonant inductance LrElectric current IrAnd magnetic
Change inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy without
Method is transmitted to transformer secondary, sustained diodeR4It is not turned on, loads by filter capacitor CfEnergy is provided.
The present invention has following technical characterstic:
1. it is flexibly used by mixing control LLC resonant converter circuit structure to wide gain FB-HB, it can be according to equipment
Required output voltage values are converted by the conducting and shutdown of digital control module control switch pipe Q2, Q4 and duty ratio, make electricity
Road topology can dynamically convert between half-bridge and full-bridge, work so as to power inverter more efficient.
2. mixing control LLC resonant converter integrated circuit topological structure for wide gain FB-HB, pass through increase on secondary side
The method of winding improves output voltage range, instead of realizing same function by frequency conversion；The advantage is that can make open
The work of plumber's working frequency is closed near the highest resonant frequency point of efficiency, can preferably meet different loads to output voltage
Demand, instead of changing the working frequency of power switch tube, switching tube conduction loss reduces, and whole system stability increased,
Efficiency is improved.
3. width gain FB-HB mixing control LLC resonant converter output voltage range is very wide, it can satisfy many electricity consumptions and set
Standby voltage requirements.When the electrical equipment of user is more, and required voltage value is inconsistent, do not need in addition to buy power conversion
Device.Cost of investment is saved for user, improves benefit.
4. when width gain FB-HB mixing control LLC resonant converter complete machine work, by rationally designing resonant capacitance Cr,
Resonant inductance Lr, magnetizing inductance LmValue and switching tube dead time, switching tube Q can be made1、Q2、Q3、Q4Realize ZVS (no-voltage
Switch) it is open-minded.The conduction loss for reducing switching tube, improves overall efficiency.
Detailed description of the invention
Fig. 1 is width gain FB-HB mixing control LLC resonant converter topological structure；
Fig. 2 is that width gain FB-HB mixing control LLC resonant converter operating mode selects flow chart；
(a), (b) of Fig. 3 are two kinds of situations that HB LLC resonant converter switchs mode one；
(a), (b) of Fig. 4 are two kinds of situations that HB LLC resonant converter switchs mode two；
(a), (b) of Fig. 5 are two kinds of situations that FB LLC resonant converter switchs mode one；
(a), (b) of Fig. 6 are two kinds of situations that FB LLC resonant converter switchs mode two；
(a), (b) of Fig. 7 are two kinds of situations that secondary side Multiple coil FB LLC resonant converter switchs mode one；
(a), (b) of Fig. 8 are two kinds of situations that secondary side Multiple coil FB LLC resonant converter switchs mode two；
Fig. 9 is symmetrical expression width gain FB-HB mixing control LLC resonant converter topological structure；
Figure 10 is the wide gain FB-HB mixing control LLC resonant converter of secondary side control type；
Figure 11 is digital control module block diagram, in the figure, Q1、Q2、Q3、Q4、Q5For the driving signal of each switching tube；
PWM1, PWM2, PWM3, PWM4, PWM5 are the pulse square wave signal that DSP is generated；VSETThe equipment set for user by host computer
Demand voltage value.
Specific embodiment
Wide gain FB-HB LLC resonant converter topological structure is as shown in Figure 1, entire controlled resonant converter topological structure is divided into
Three parts, first part are switching networks, and second part is resonant network, and Part III is rectifying and wave-filtering network.
Wherein first part's switching network includes power switch tube Q1、Q2、Q3、Q4, power switch junction capacitance C1、C2、C3、
C4, power switch tube body diode D1、D2、D3、D4, input voltage Vin, two bridge arm midpoint potential A, B.Second part resonant network
Including resonant capacitance Cr, resonant inductance Lr, the magnetizing inductance L of transformer primary windingm.Part III rectifying and wave-filtering network includes
The inductance L of four windings of transformer secondaryS1、LS2、LS3、LS4, sustained diodeR1、DR2、DR3、DR4, power switch tube Q5, filtering
Capacitor Cf, load R, output voltage Vo, specific connection structure are as follows:
In the switching network: Q1、Q3After series connection, Q2、Q4After series connection, C1、C3After series connection, C2、C4It is connected in parallel on after series connection
VinBoth ends, C1、C2、C3、C4It is connected in parallel on Q respectively1、Q2、Q3、Q4Both ends；In C1、C3Between take point A, A a point to be connected to D1、D3Between
And Q1、Q3Between；In C2、C4Between take point B, B a point to be connected to D2、D4Between and Q2、Q4Between；
In the resonant network: Cr、Lr、LmAfter series connection, one end connection A point, the other end connection B point；
In the rectifying and wave-filtering network, LS1、LS2、LS3、LS4After series connection, one end connects DR1Anode, the other end connection
DR4Anode；The voltage at the both ends R is output voltage Vo, CfIt is connected in parallel on the both ends R；DR2Anode be connected to LS1And LS2Between, DR2's
Cathode connects CfOne end, CfThe other end be connected to LS2、LS3Between；DR3Anode be connected to LS3、LS4Between, DR3Cathode
Connect DR2Cathode, DR4Cathode connect DR1Cathode and Q5Grid, Q5Source electrode, drain electrode and DR2Cathode connection.
In the present solution, the circuit structure further includes digital control module, digital control module is driven by light-coupled isolation
Dynamic circuit is separately connected power switch tube Q1、Q2、Q3、Q4And Q5, as shown in figure 11, digital control module uses in the present embodiment
Dsp controller, it is corresponding to drive that the pulse square wave signal generated generates driving signal after optical couple isolation drive circuit
Power switch tube.The optical couple isolation drive circuit is custom circuit, and this will not be repeated here.In addition, the digital control mould
Block is also used to read output voltage VoValue and calculate gain M.
The wide gain FB-HB mixing control LLC resonant converter that the present invention is implemented can be transformed to three kinds of circuit structures:
The first: HB LLC resonant converter realizes low gain range, i.e., input voltage is in high scope, and output voltage is low
It works under range of condition.
Second: FB LLC resonant converter realizes high gain range, i.e., input voltage is in low range, and output voltage is in height
It works under range of condition.
The third: secondary side Multiple coil FB LLC resonant converter realizes more high output voltage, that is, passes through control switch pipe Q5
It is open-minded, make LS1、LS2、LS3、LS4Vice-side winding and load generate circuit, so that output voltage is higher.
Set controlled resonant converter power switch tube Q1、Q2、Q3、Q4Working frequency isResonant frequency point
Near.Demand by equipment to controlled resonant converter output voltage values it is found that if required voltage design output voltage range compared with
When low value, make controlled resonant converter work in HB by digital control module (as shown in figure 11, being dsp controller in the present embodiment)
LLC resonant converter state；If required voltage makes resonance by digital control module when designing output voltage range median
Converter works in FB LLC resonant converter state；If required voltage passes through number when designing output voltage range high value
Word control module makes controlled resonant converter work in secondary side Multiple coil FB LLC resonant converter state.
1. width gain FB-HB mixing control LLC resonant converter work pattern selection method
After controlled resonant converter start completion, by voltage value V needed for equipmentoIt is transported to digital control module, and then is judged
Which kind of operating mode is wide gain FB-HB LLC resonant converter should work at.Controlled resonant converter resonant network gain M is output
For voltage multiplied by the ratio of the transformer primary pair side turn ratio and input voltage, n is the turn ratio of transformer primary winding and vice-side winding, fixed
Primary side winding the number of turns of adopted transformer is Np, the secondary single umber of turn in side is Ns, input voltage value Vin, output voltage Vo.At this
The value range that controlled resonant converter resonant network gain M is taken in embodiment is 0.8-4.8.Wide gain FB-HB LLC resonant transformation
Device operating mode selects flow chart as shown in Figure 2.
2. three kinds of operating mode details
There are four types of operational modes for width gain FB-HB mixing control LLC resonant converter in Fig. 2, wherein wide gain FB-HB
When mixing control LLC resonant converter breaks down, entire circuit all stops working.After fault restoration, hand is generally required
Dynamic Switching power switch, can just make converter restart work.Mainly other three kinds of operating modes are described in detail below.
2.1 HB LLC resonant converter modes
After power inverter whole system start completion, the output voltage values according to needed for user equipment are in low output voltage
Range, i.e. resonant network gain M are as follows: when 0.5≤M < 1, the work of Systematic selection power inverter is humorous in HB LLC in the case
Vibration converter mode.Each power device state of HB LLC resonant converter mode is as follows: Q4It is permanent to open, Q2、Q5It is permanent to close,
Q1、Q3Work is in HF switch state；Q1、Q3Dead zone upper and lower switching tube Q in order to prevent is arranged in complementation conducting1、Q3It is straight-through, pass through
Digital control module makes Q1、Q3Switching frequency operation near resonant frequency point；Resonant capacitance Cr, resonant inductance Lr, magnetization electricity
Feel LmResonant tank is collectively formed, the energy transmission that vice-side winding inductance, secondary side freewheeling diode receive primary side is to load.
This mode switch network inputs voltage Vin, rectifying and wave-filtering net output voltage Vo.The fundamental relation of HB LLC resonant converter are as follows:N=Np/Ns。
HB LLC resonant converter specific work process is:
(1) HB LLC resonant converter switch mode one (the first situation), as shown in (a) of Fig. 3:
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference transfer energy to transformer secondary, secondary side sustained diodeR2Conducting, energy transmission to load.
(2) HB LLC resonant converter switch mode one (second situation), as shown in (b) of Fig. 3:
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference be zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR2It is not turned on, loads by filter capacitor CfIt provides
Energy.
(3) HB LLC resonant converter switch mode two (the first situation), as shown in (a) of Fig. 4:
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network Lr、Lm、CrPass through Q3And Q4Forming circuit, resonant inductance LrElectricity
Flow IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference will
Amount is transmitted to transformer secondary, secondary side sustained diodeR3Conducting, energy transmission to load.
(4) HB LLC resonant converter switch mode two (second situation), as shown in (b) of Fig. 4:
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network Lr、Lm、CrPass through Q3And Q4Forming circuit, resonant inductance LrElectricity
Flow IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be
Zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
2.2 FB LLC resonant converter modes
When power inverter begins operating in HB LLC resonant converter mode, the electricity of the output according to needed for user equipment
Pressure value is in middle output voltage range, i.e. resonant network gain M are as follows: when 1≤M < 1.5, Systematic selection power conversion in the case
Device works in FB LLC resonant converter mode.Each power device state of FB LLC resonant converter mode is as follows: Q4Duty
Than being gradient to 50%, Q by 100%2Duty ratio be gradient to 50% by 0, when progressive formation completion after, Q1、Q2、Q3、Q4Work
In HF switch state, Q5It is permanent to close；Q1、Q3And Q2、Q4Complementary conducting respectively, Q1、Q4And Q2、Q3It simultaneously turns on and closes respectively
It is disconnected, and switching tube is straight-through up and down in order to prevent in setting dead zone, makes Q by digital control module1、Q2、Q3、Q4Switching frequency work
Make near resonant frequency point；Resonant capacitance Cr, resonant inductance Lr, magnetizing inductance LmCollectively form resonant tank, vice-side winding electricity
The energy transmission that sense, secondary side freewheeling diode receive primary side is to load.This mode switch network inputs voltage Vin, rectification filter
Wave network output voltage Vo.The fundamental relation of FB LLC resonant converter are as follows:
FB LLC resonant converter specific work process is:
(1) FB LLC resonant converter switch mode one (the first situation), as shown in (a) of Fig. 5:
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference transfer energy to transformer secondary, secondary side sustained diodeR2Conducting, energy transmission to load.
(2) FB LLC resonant converter switch mode one (second situation), as shown in (b) of Fig. 5:
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference be zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR2It is not turned on, loads by filter capacitor CfIt provides
Energy.
(3) FB LLC resonant converter switch mode two (the first situation), as shown in (a) of Fig. 6:
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, input voltage VinPass through Q2And Q3It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference transfer energy to transformer secondary, secondary side sustained diodeR3Conducting, energy transmission to load.
(4) FB LLC resonant converter switch mode two (second situation), as shown in (b) of Fig. 6:
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, resonant network Lr、Lm、CrPass through Q2And Q3Forming circuit, resonant inductance LrElectricity
Flow IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be
Zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
2.3 secondary side Multiple coil FB LLC resonant converter modes
When power inverter begins operating in FB LLC resonant converter mode, the electricity of the output according to needed for user equipment
Pressure value is in high output voltage range, i.e. resonant network gain M are as follows: when 1.5≤M < 2, Systematic selection power conversion in the case
Device works in secondary side Multiple coil FB LLC resonant converter mode.Each power device of secondary side Multiple coil FB LLC resonant converter mode
Part state is as follows: Q1、Q2、Q3、Q4The HF switch state that work is 50% in duty ratio, Q5It is permanent open-minded；Q1、Q3And Q2、Q4Point
Not complementary conducting, Q1、Q4And Q2、Q3It simultaneously turns on and turns off respectively, and switching tube is straight-through up and down in order to prevent in setting dead zone, leads to
Crossing digital control module makes Q1、Q2、Q3、Q4Switching frequency operation near resonant frequency point；Resonant capacitance Cr, resonant inductance
Lr, magnetizing inductance LmResonant tank is collectively formed, the energy that vice-side winding inductance, secondary side freewheeling diode receive primary side passes
It is defeated by load.This mode switch network inputs voltage Vin, rectifying and wave-filtering net output voltage Vo.Secondary side Multiple coil FB LLC resonance
The fundamental relation of converter are as follows:N=Np/(2*Ns)。
Secondary one specific work process of side Multiple coil FB LLC resonant converter situation is:
(1) secondary side Multiple coil FB LLC resonant converter switch mode one (the first situation), as shown in (a) of Fig. 7:
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference transfer energy to transformer secondary, secondary side sustained diodeR1Conducting, energy transmission to load.
(2) secondary side Multiple coil FB LLC resonant converter switch mode one (second situation), as shown in (b) of Fig. 7:
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference be zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR1It is not turned on, loads by filter capacitor CfIt provides
Energy.
(3) secondary side Multiple coil FB LLC resonant converter switch mode two (the first situation), as shown in (a) of Fig. 8:
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, input voltage VinPass through Q2And Q3It is added to resonant network Lr、Lm、CrOn, resonance electricity
Feel LrElectric current IrWith magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current Im
Difference transfer energy to transformer secondary, secondary side sustained diodeR4Conducting, energy transmission to load.
(4) secondary side Multiple coil FB LLC resonant converter switch mode two (second situation), as shown in (b) of Fig. 8:
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, resonant network Lr、Lm、CrPass through Q2And Q3Forming circuit, resonant inductance LrElectricity
Flow IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be
Zero, energy can not be transmitted to transformer secondary, secondary side sustained diodeR4It is not turned on, loads by filter capacitor CfEnergy is provided.
Other than above-mentioned technical proposal, wide gain FB-HB as shown in Figure 1 can also be mixed to control LLC resonant transformation
Device topological structure changes symmetrical expression width gain FB-HB mixing control LLC resonant converter into as shown in figure 9, its entire resonant transformation
Device topological structure is divided into three parts, and first part is switching network module, and second part is resonant network module, and Part III is
Rectifying and wave-filtering network module.The controlled resonant converter topological structure only has first part and controlled resonant converter topology knot shown in FIG. 1
Structure is different, other two parts are identical.Symmetrical width gain FB-HB LLC resonant converter topological structure first part switchs net
Network module mainly includes power switch tube Q1、Q2、Q3、Q4、Q6、Q7, neutral-point potential balance capacitor C5、C6, power switch junction capacitance
C1、C2、C3、C4, power switch tube body diode D1、D2、D3、D4, input voltage Vin, two bridge arm midpoint potential A, B.The resonance becomes
Parallel operation topological structure working method is broadly divided into three parts: (1) HB as controlled resonant converter working method shown in FIG. 1
LLC resonant converter realizes low gain range, i.e. input voltage works under low range of condition in high scope, output voltage；(2)
FB LLC resonant converter realizes high gain range, i.e. input voltage works under the conditions of high scope in low range, output voltage；
(3) secondary side Multiple coil FB LLC resonant converter realizes more high output voltage, i.e., is opened by controlling controlled resonant converter pair side power
Close pipe Q5It is open-minded, make the inductance L of each winding of transformer secondaryS1、LS2、LS3、LS4Circuit is generated with load, so that output voltage
It is higher.Symmetrical expression width gain FB-HB LLC resonant converter passes through capacitor C5、C6It can reduce input current ripple and input
The voltage stress of bus capacitor, and effectively inhibit the overshoot of primary side resonance current, prevent circuit from damaging, promote overall efficiency.
In addition, removing switching tube Q5, by sustained diodeR2、DR4It is replaced with power switch tube Q6、Q7, circuit topology knot
Composition is as shown in Figure 10.Its entire controlled resonant converter topological structure is divided into three parts, and first part is switching network module, and second
Part is resonant network module, and Part III is rectifying and wave-filtering network module.The controlled resonant converter topological structure only has third portion
Point different with controlled resonant converter topological structure shown in FIG. 1, other two parts are identical.The secondary wide gain FB-HB of side control type
LLC resonant converter topological structure Part III rectifying and wave-filtering network module mainly includes the inductance of four windings of transformer secondary
LS1、LS2、LS3、LS4, sustained diodeR2、DR3, power switch tube Q6、Q7, filter capacitor Cf, load R, output voltage Vo.The pair
The wide gain FB-HB LLC resonant converter topological structure working method of side control type and controlled resonant converter work side shown in FIG. 1
Formula is the same.The controlled resonant converter passes through digital control module control switch pipe Q6、Q7, make vice-side winding any combination, to make defeated
Voltage is adjusted more flexible out, and the coil utilization rate of vice-side winding increased.However due to the electricity on secondary side centre cap both sides
Pressure value is asymmetric, causes output voltage values unstable, increases the device loss of electrical equipment, reduce the service life.
Claims (8)
1. a kind of circuit structure for realizing wide gain FB-HB LLC resonant converter, including sequentially connected switching network, resonance
Network and rectifying and wave-filtering network, it is characterised in that:
The switching network includes power switch tube Q1、Q2、Q3、Q4, power switch junction capacitance C1、C2、C3、C4, power switch
Tube body diode D1、D2、D3、D4, input voltage Vin, wherein Q1、Q3After series connection, Q2、Q4After series connection, C1、C3After series connection, C2、C4String
V is connected in parallel on after connectioninBoth ends, C1、C2、C3、C4It is connected in parallel on Q respectively1、Q2、Q3、Q4Both ends；In C1、C3Between take point A, A a point connect
It is connected to D1、D3Between and Q1、Q3Between；In C2、C4Between take point B, B a point to be connected to D2、D4Between and Q2、Q4Between；
The resonant network includes resonant capacitance Cr, resonant inductance LrWith the magnetizing inductance L of transformer primary windingm, wherein Cr、
Lr、LmAfter series connection, one end connection A point, the other end connection B point；
The rectifying and wave-filtering network includes four inductance L of transformer secondary windingS1、LS2、LS3、LS4, sustained diodeR1、
DR2、DR3、DR4, power switch tube Q5, filter capacitor Cf, load R and output voltage Vo；Wherein, LS1、LS2、LS3、LS4After series connection,
One end connects DR1Anode, the other end connect DR4Anode；The voltage at the both ends R is output voltage Vo, CfIt is connected in parallel on the both ends R；DR2
Anode be connected to LS1And LS2Between, DR2Cathode connect CfOne end, CfThe other end be connected to LS2、LS3Between；DR3Just
Pole is connected to LS3、LS4Between, DR3Cathode connect DR2Cathode, DR4Cathode connect DR1Cathode and Q5Grid, Q5's
Source electrode, drain electrode and DR2Cathode connection.
2. the circuit structure as described in claim 1 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The circuit structure stated further includes digital control module, and digital control module is separately connected power by optical couple isolation drive circuit and opens
Close pipe Q1、Q2、Q3、Q4And Q5。
3. a kind of control method for realizing wide gain FB-HB LLC resonant converter, which comprises the following steps:
After controlled resonant converter starting, pass through output voltage VoValue judgement should work in various operating modes, method are as follows:
Controlled resonant converter gain M is calculated using given reference value；
As 0.8≤M < 1.2, controlled resonant converter works in HB LLC resonant converter mode, the at this time work of each power device
State are as follows: Q4It is permanent to open, Q2、Q5It is permanent to close, Q1、Q3Work is in HF switch state；Q1、Q3Complementation conducting, is arranged dead zone
To prevent Q1、Q3It is straight-through；Make Q by digital control module1、Q3Switching frequency operation near resonant frequency point；
As 1.2≤M < 2.4, controlled resonant converter works in FB LLC resonant converter mode, the at this time work of each power device
State are as follows: Q4Duty ratio be gradient to 50%, Q by 100%2Duty ratio be gradient to 50% by 0, when progressive formation completion after,
Q1、Q2、Q3、Q4Work is in HF switch state, Q5It is permanent to close；Q1、Q3And Q2、Q4Complementary conducting respectively, Q1、Q4And Q2、Q3Point
It does not simultaneously turn on and turns off, dead zone is set to prevent Q1、Q3Or Q2、Q4It is straight-through；Make Q by digital control module1、Q2、Q3、Q4's
Switching frequency operation is near resonant frequency point；
As 2.4≤M < 4.8, controlled resonant converter work is in secondary side Multiple coil FB LLC resonant converter mode, each power at this time
The working condition of device are as follows: Q1、Q2、Q3、Q4The HF switch state that work is 50% in duty ratio, Q5It is permanent open-minded；Q1、Q3With
Q2、Q4Complementary conducting respectively, Q1、Q4And Q2、Q3It simultaneously turns on and turns off respectively, dead zone is set to prevent Q1、Q3Or Q2、Q4It is straight-through；
Make Q by digital control module1、Q2、Q3、Q4Switching frequency operation near resonant frequency point.
4. the control method as claimed in claim 3 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The calculation formula for the resonant frequency point stated are as follows:
5. the control method as claimed in claim 3 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The given reference value of the utilization stated calculates controlled resonant converter gain M, specifically:
Controlled resonant converter resonance gain M is output voltage VoMultiplied by the transformer primary pair side turn ratio and input voltage VinRatio.
6. the control method as claimed in claim 3 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The specific work process for the HB LLC resonant converter mode stated are as follows:
(1) HB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference energy is passed
It is delivered to transformer secondary, sustained diodeR2Conducting, energy transmission to load；
(2) HB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy
Amount can not be transmitted to transformer secondary, sustained diodeR2It is not turned on, loads by filter capacitor CfEnergy is provided；
(3) HB LLC resonant converter switchs mode two
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network pass through Q3And Q4Forming circuit, resonant inductance LrElectric current IrWith magnetization electricity
Feel LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference transfer energy to transformation
Device pair side, sustained diodeR3Conducting, energy transmission to load；
(4) HB LLC resonant converter switchs mode two
Q3、Q4It is open-minded, Q1、Q2、Q5Shutdown, resonant network pass through Q3And Q4Forming circuit, resonant inductance LrElectric current IrWith magnetization electricity
Feel LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy can not pass
It is delivered to transformer secondary, sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
7. the control method as claimed in claim 3 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The FB LLC resonant converter specific work process stated are as follows:
(1) FB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference energy is passed
It is delivered to transformer secondary, sustained diodeR2Conducting, energy transmission to load；
(2) FB LLC resonant converter switchs mode one
Q1、Q4It is open-minded, Q2、Q3、Q5Shutdown, input voltage VinPass through Q1And Q4It is added to resonant network Lr、Lm、CrOn, resonant inductance Lr
Electric current IrWith magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference
It is zero, energy can not be transmitted to transformer secondary, sustained diodeR2It is not turned on, loads by filter capacitor CfEnergy is provided；
(3) FB LLC resonant converter switchs mode two
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, input voltage VinPass through Q2And Q3It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference energy is passed
It is delivered to transformer secondary, sustained diodeR3Conducting, energy transmission to load；
(4) FB LLC resonant converter switchs mode two
Q2、Q3It is open-minded, Q1、Q4、Q5Shutdown, resonant network pass through Q2And Q3Forming circuit, resonant inductance LrElectric current IrWith magnetization electricity
Feel LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy can not pass
It is delivered to transformer secondary, sustained diodeR3It is not turned on, loads by filter capacitor CfEnergy is provided.
8. the control method as claimed in claim 3 for realizing wide gain FB-HB LLC resonant converter, which is characterized in that institute
The specific work process for the secondary side Multiple coil FB LLC resonant converter mode stated are as follows:
(1) secondary side Multiple coil FB LLC resonant converter switchs mode one
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference energy is passed
It is delivered to transformer secondary, sustained diodeR1Conducting, energy transmission to load；
(2) secondary side Multiple coil FB LLC resonant converter switchs mode one
Q1、Q4、Q5It is open-minded, Q2、Q3Shutdown, input voltage VinPass through Q1And Q4It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy
Amount can not be transmitted to transformer secondary, sustained diodeR1It is not turned on, loads by filter capacitor CfEnergy is provided；
(3) secondary side Multiple coil FB LLC resonant converter switchs mode two
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, input voltage VinPass through Q2And Q3It is added on resonant network, resonant inductance LrElectric current Ir
With magnetizing inductance LmElectric current ImIncrease, utilizes resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference energy is passed
It is delivered to transformer secondary, sustained diodeR4Conducting, energy transmission to load；
(4) secondary side Multiple coil FB LLC resonant converter switchs mode two
Q2、Q3、Q5It is open-minded, Q1、Q4Shutdown, resonant network pass through Q2And Q3Forming circuit, resonant inductance LrElectric current IrWith magnetization electricity
Feel LmElectric current ImIt is equal, due to resonant inductance LrElectric current IrWith magnetizing inductance LmElectric current ImDifference be zero, energy can not pass
It is delivered to transformer secondary, sustained diodeR4It is not turned on, loads by filter capacitor CfEnergy is provided.
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