CN109327144A - A kind of LLC resonant converter of wide input voltage range - Google Patents
A kind of LLC resonant converter of wide input voltage range Download PDFInfo
- Publication number
- CN109327144A CN109327144A CN201811176061.8A CN201811176061A CN109327144A CN 109327144 A CN109327144 A CN 109327144A CN 201811176061 A CN201811176061 A CN 201811176061A CN 109327144 A CN109327144 A CN 109327144A
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- Prior art keywords
- llc resonant
- resonant converter
- output
- llc
- capacitance
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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
- H02M3/33569—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
-
- 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 LLC resonant converters of wide input voltage range.The purpose of the present invention is to solve LLC resonant converter input voltage in the prior art is narrow, and when load is underloading or is unloaded, voltage gain is small, and output voltage floats high problem.LLC resonant converter of the present invention includes sequentially connected power input, switching circuitry, LLC resonant network and output rectification circuit, combined full-bridge three-level structure of the present invention passes through the topological structure of two level bridge arms and three level bridge arms, increase the range of input voltage, it is configured by the fission to resonant capacitance, change the gain curve of LLC resonant converter, stable output voltage is obtained, not additional loss generates.
Description
Technical field
The present invention relates to a kind of Switching Power Supplies, more particularly to a kind of LLC converter of Switching Power Supply.
Background technique
In recent years, it is gradually increased with the improvement of people ' s living standards with the requirement to physical conditions for life, railcar
Prosperity be people daily trip bring great convenience.Reliability, comfort, energy conservation are being runed with to railcar
What noise reduction and maintainability etc. required further increases, efficiency, power density, noise of the people to subway AuCT
The requirement of the indexs such as vibration is also more stringent.Controlled resonant converter can meet the high switching frequency of Switching Power Supply, high power density because of it
With the development trend of conversion efficiency, extensive concern has been obtained in recent years.Since LLC resonant converter can realize full-load range
Interior no-voltage is open-minded, and secondary side rectifier diode can realize zero-current switching.Meanwhile the magnetic in the main circuit of the converter
Property element is easily integrated, the limited leakage inductance that transformer is utilized so that LLC resonant converter be widely used in high-power field
It closes.
Traditional LLC converter topology structure, when its input voltage range increases, the range of switching frequency adjusting
Increase with it, at this time it is possible that high input voltage can cause excessively high switching frequency, intensify the parasitic parameter etc. of circuit
System bring is influenced.Meanwhile in order to adapt to the input voltage of wider range, magnetizing inductance needs the very little designed, thus
Cause the increase of converter resonance current, so that system conduction loss and magnetic hystersis loss increase therewith, substantially reduces converter effect
Rate.There is scholar to propose the three-level converter for being suitable for high-power occasion, by three level works when realizing high input voltage
Operation mode, reduces the voltage stress of power device, to reduce the adjustable range of switching frequency.But three level translations
Device realizes stable output voltage when low pressure inputs, and needs biggish voltage gain, and the efficiency in low pressure input
Lower, resonant element stress is larger, therefore can only solve the problems, such as input voltage fluctuation in smaller range.
Summary of the invention
The purpose of the present invention is to solve LLC resonant transform circuits in the prior art when input voltage is higher, function
The excessive defect of the voltage stress that rate diode is born, and load are when being lightly loaded or is unloaded, and output voltage floats high situation.
To achieve the goals above, the present invention is achieved by the following scheme:
A kind of Hybrid full-bridge three-level converter being very suitable for wide input voltage range, including DC power supply
Vin, inverter circuit, LLC resonant network and output rectification circuit, wherein the LLC resonant converter further includes that a secondary side is humorous
Shake capacitor.DC power supply Vin is connect with inverter circuit, and resonant network is parallel on inverter circuit, and output rectification filter is logical
Transformer is crossed to be connected with resonant network, described secondary one end in resonant capacitance and the transformer it is secondary while connect, the secondary side
The other end of resonant capacitance is connect with the rectification circuit.
In conjunction with the technical solution adopted in the present invention, in the first implementation of the technical solution adopted in the present invention,
The inverter circuit uses combined full-bridge three-level inverter, and switching tube uses IGBT, the collector and emitter of IGBT it
Between in parallel body diode and parasitic capacitance.
The combined full-bridge three-level inverter is connected in parallel using three level bridge arms and two level bridge arms.
The three level bridge arm includes switch IGBT pipe Q1, switch IGBT pipe Q2, switch IGBT pipe Q3, switch IGBT pipe
Q4, body diode D1, body diode D2, body diode D3, body diode D4, parasitic capacitance C1, parasitic capacitance C2, parasitic capacitance
C3, parasitic capacitance C4, two derided capacitors Cin1 and Cin2, sustained diode 7 and the D8 and striding capacitance being connected in series
Css。
The both ends of two inputs derided capacitors Cin1 and Cin2 connect with the anode and cathode of DC power supply Vin respectively
It connects, the tri-level switch bridge arm of inverter is managed by switch IGBT pipe Q1, switch IGBT pipe Q2, switch IGBT pipe Q3, switch IGBT
The emitter of Q4 is sequentially connected in series with collector, and the collector and switch IGBT positioned at the IGBT pipe Q1 at switch bridge arm both ends are managed
The emitter of Q4 is connected with the anode and cathode of power supply respectively, the intermediate connection point of switch IGBT pipe Q2 and switch IGBT pipe Q3
It is connected with the intermediate connection point of two derided capacitors Cin1 and Cin2；Body diode D1 and parasitic capacitance C1 are connected in parallel on switch IGBT
Between the collector and emitter of pipe Q1, and the anode of body diode D1 is connected with the emitter of switch IGBT pipe Q1；Two pole of body
Pipe D2 and parasitic capacitance C2 is connected in parallel between the collector and emitter of switch IGBT pipe Q2, and the anode of body diode D2 with open
The emitter for closing IGBT pipe Q2 is connected；Body diode D3 and parasitic capacitance C3 is connected in parallel on collector and the transmitting of switch IGBT pipe Q3
Between pole, and the anode of body diode D2 is connected with the emitter of switch IGBT pipe Q3；Body diode D4 and parasitic capacitance C4 are simultaneously
It is associated between the collector and emitter of switch IGBT pipe Q4, and the emitter of the anode of body diode D4 and switch IGBT pipe Q4
It is connected.
The emitter of switch IGBT pipe Q1 and the collector midpoint of switch IGBT pipe Q2 are connected with one end of striding capacitance Css
It connects, the emitter of switch IGBT pipe Q3 and the collector midpoint of switch IGBT pipe Q4 are connected with the other end of striding capacitance Css.
The anode of sustained diode 7 is connected with the midpoint of derided capacitors Cin1 and Cin2, cathode and switch IGBT pipe Q1
Emitter be connected with the collector midpoint of switch IGBT pipe Q2；The cathode of sustained diode 8 and derided capacitors Cin1 and
The midpoint of Cin2 is connected, and anode is connected with the collector midpoint of the emitter of switch IGBT pipe Q3 and switch IGBT pipe Q4.
The two level bridge arm includes switch IGBT pipe Q5, switch IGBT pipe Q6, body diode D5, body diode D6, posts
Raw capacitor C5, parasitic capacitance C6.
The collector of switch IGBT pipe Q5 is connected with the collector of switch IGBT pipe Q1, the emitter of switch IGBT pipe Q6
It is connected with the emitter of switch IGBT pipe Q4；Body diode D5 and parasitic capacitance C5 is connected in parallel on the collector of switch IGBT pipe Q5
Between emitter, and the anode of body diode D5 is connected with the emitter of switch IGBT pipe Q5；Body diode D6 and parasitism electricity
Hold C6 to be connected in parallel between the collector and emitter of switch IGBT pipe Q6, and the anode of body diode D6 is with switch IGBT pipe Q6's
Emitter is connected.
The transformer primary winding is connected with resonance circuit, and vice-side winding is connect with one end of secondary side resonant capacitance, secondary side
The other end of resonant capacitance is connected with rectification circuit.
The resonance circuit includes resonant capacitance Cr, resonant inductance Lr and resonant inductance Lm.
One end of resonant inductance Lr is connected with one end of transformer primary winding Np, the other end and switch IGBT pipe Q2 and opens
The tie point for closing IGBT pipe Q3 is connected；The other end of transformer primary winding Np is connected with the one end resonant capacitance Cr；Resonance electricity
The other end for holding Cr is connected with the tie point of switch IGBT pipe Q5 and switch IGBT pipe Q6, and resonant inductance Lm is connected in parallel on transformer
The both ends of primary side winding Np.
In the first implementation of the technical solution adopted in the present invention, the output rectification circuit is full-bridge rectification electricity
Road, described secondary one end in resonant capacitance and the transformer it is secondary while connect, the other end of the secondary side resonant capacitance and institute
State full bridge rectifier connection.
Second of implementation of the technical solution adopted in the present invention, the output rectification circuit are Half bridge rectifier electricity
Road, described secondary one end in resonant capacitance and the transformer it is secondary while be connected, the other end of the secondary side resonant capacitance and institute
Half bridge rectifier circuit is stated to be connected.
In the first implementation of the technical solution adopted in the present invention, the output rectification circuit includes two poles of rectification
Pipe DR1, rectifier diode DR2, rectifier diode DR3 and rectifier diode DR4, pair side resonant capacitance C0, filter capacitor Cf with
And output loading R0；The Same Name of Ends of transformer secondary winding is connected with one end of pair side resonant capacitance C0, transformer secondary around
The different name end of group is connected with the cathode of rectifier diode DR4；The other end of secondary side resonant capacitance C0 and rectifier diode DR1's
Anode is connected；The anode of rectifier diode DR1 is connected with the cathode of rectifier diode DR2；The anode of rectifier diode DR3
It is connected with the cathode of rectifier diode DR4；One end of output filter capacitor Cf is connected with the cathode of rectifier diode DR3,
The other end of output filter capacitor Cf is connected with the anode of DR4；Output loading R0 is connected in parallel on the both ends of filter capacitor C0.
In second of implementation of the technical solution adopted in the present invention, the output rectification circuit includes two poles of rectification
Pipe DR1, rectifier diode DR2, pair side resonant capacitance C0, filter capacitor Cf and output loading R0；The output rectification circuit
For the centre tapped full-wave rectifying circuit of transformer secondary winding, one end of the pair side resonant capacitance C0 and the full-wave rectification
The output end of circuit connects, and the other end of the pair side resonant capacitance C0 is the output end of LLC resonant converter.
LLC resonant converter provided in an embodiment of the present invention is suitable for the application of wide input voltage range, and three
The switch tube voltage stress of level bridge arm only has the half of input voltage, while by carrying out seperated configuration to resonant capacitance, changing
The gain curve for becoming LLC resonant converter, obtains stable output voltage.
Specific embodiment
Below in conjunction with Detailed description of the invention a specific embodiment of the invention, it should be understood that the implementation for showing and describing in attached drawing
Mode is merely exemplary, it is intended that is illustrated the principle of the present invention and method, and is not intended to limit the scope of the invention.
It please refers to shown in Fig. 1, the embodiment of the present invention proposes that a kind of LLC resonant converter, the LLC resonant converter include
Sequentially connected power input (Vin), switching circuitry 1, LLC resonant network 2 and output rectification circuit 3, LLC resonant converter
It further include secondary side resonant capacitance C0.
Specifically, as shown in Figure 1, combined full-bridge power switch tube converter is by power switch tube Q1, power switch tube
Q2, power switch tube Q3, power switch tube Q4 and power switch tube Q5 are constituted.The collection of power switch tube Q1 and power switch tube Q5
The positive Vin+ connection of electrode and power input, the emitter and power input of power switch tube Q4 and power switch tube Q6
Cathode Vin- connection.Power switch tube Q1, power switch tube Q2, power switch tube Q3, power switch tube Q4, power switch tube
The gate pole of Q5 and power switch tube Q6 are connect with external drive module (as shown in the figure), the exportable control letter of external drive module
Number, control power switch tube Q1, power switch tube Q2, power switch tube Q3, power switch tube Q4, power switch tube Q5 and power
Switching tube Q6's turns on and off.
Switching circuitry 1 is turned on and off by control power switch tube, and exportable square-wave signal is given to LLC resonant network
2。
In the present embodiment, as shown in Figure 1, LLC resonant network 2 includes that transformer T and transformer T primary side are connected in series
Resonant inductance Lr and resonant capacitance Cr, i.e., composition tandem type LLC resonant network.Wherein Lm is the magnetizing inductance of transformer T.
It refer again to shown in attached drawing 1, in the present embodiment, output rectification circuit 3 can be full bridge rectifier, full-bridge rectification
Circuit is made of diode DR1, diode DR2, diode DR3 and diode DR4.One end of secondary side resonant capacitance C0 and transformation
The secondary side of device T connects, and the other end of secondary side resonant capacitance C0 is connect with full bridge rectifier.
It refer again to shown in attached drawing 2, in the present embodiment, output rectification circuit 3 can be taken out for transformer secondary winding center
The full-wave rectifying circuit of head, full-wave rectifying circuit are made of diode D1 and diode D2.One end of secondary side resonant capacitance C0 with
The output end of full-wave rectifying circuit connects, and the other end of secondary side resonant capacitance C0 is the output end of LLC resonant converter.
In the present embodiment, LLC resonant converter further includes output load impedance R0, and output load impedance R0 and output are filtered
Wave capacitor C0 is connected in parallel, and V0+ and V0- are the output end of LLC resonant converter.
The working principle of LLC resonant converter is substantially are as follows:
When power switch tube Q1, power switch tube Q2, power switch tube Q6 are opened, DC power supply passes through current input terminal
(Vin+) Lp is flowed into, transformer primary side stores energy in capacitor Cr, while energy is coupled to secondary side by transformer coil,
And it is stored in capacitor Cf and capacitor C0 by diode DR1 and DR4；
Power switch tube Q2, power switch tube Q6 are open-minded, and when power switch tube Q1 is turned off, capacitor Cr passes through transformer primary side
Inductance Lp, power switch tube Q2 and power switch tube Q6 release energy, while energy is coupled to secondary side by transformer coil, together
When C0 be allowed to discharge through diode DR2 and DR4 and be stored in capacitor Cf, realize energy exchange.
As shown in figure 3, all load lines are several when working frequency is 6 times or more of the resonance frequency that Lp, Cp are constituted
It is overlapped, no-load characteristic is greatly improved, and it is working frequency that wherein transformer primary side and the coefficient of coup on secondary side, which are 0.98, fn,
With the ratio of Lp, Cp resonance frequency constituted.
In addition, although describing the operation of the method for the present invention in the accompanying drawings with particular order, this do not require that or
Hint must execute these operations in this particular order, or must have gone through all operationss and be just able to achieve expected knot
Fruit.On the contrary, can be by omitting certain steps, multiple steps are combined into a step or a step being decomposed into multiple steps
It is rapid to realize original function.
Detailed description of the invention
Fig. 1, a kind of topology diagram of the LLC resonant converter of wide input range of the present invention
Fig. 2, the topology diagram of the LLC resonant converter of another kind wide input range of the present invention
Fig. 3, the gain curve structural schematic diagram of the LLC resonant converter of the embodiment of the present invention.
Claims (7)
1. a kind of LLC resonant converter of wide input voltage range, the LLC resonant converter includes that sequentially connected power supply is defeated
Enter end, switching circuitry, LLC resonant converter and output rectification circuit, which is characterized in that the LLC resonant converter switchs back
Road is combined full-bridge three-level, and output rectification circuit further includes a secondary side resonant capacitance.
2. a kind of LLC resonant converter according to claim 1, which is characterized in that the switching circuitry is that combined type is complete
Three level of bridge, the switching circuitry include two level bridge arms and three level bridge arms.
3. a kind of LLC resonant converter according to claim 1 to 2, which is characterized in that the output rectification circuit is complete
Bridge rectification circuit, described secondary one end in resonant capacitance and the transformer it is secondary while connect, the one of the secondary side resonant capacitance
End is connect with the full bridge rectifier.
4. a kind of LLC resonant converter according to claim 1 to 2, which is characterized in that the output rectification circuit is to become
The centre tapped full-wave rectifying circuit of depressor vice-side winding, one end of pair side resonant capacitance and the full-wave rectifying circuit
The other end of connection, pair side resonant capacitance is the output end of LLC resonant converter.
5. a kind of LLC resonant converter according to claim 2, which is characterized in that the power switch tube is insulated gate
Bipolar junction transistor converter.
6. LLC resonant converter according to claim 1 to 4, it is characterised in that the resonant network includes transformation
Device, the first resonant inductance and the first resonant capacitance being connected in series with transformer primary side.
7. LLC resonant converter according to claim 1 to 4, which is characterized in that the LLC resonant converter is also wrapped
Include an output filter capacitor, the output end series connection of the output filter capacitor and the output rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811176061.8A CN109327144A (en) | 2018-10-10 | 2018-10-10 | A kind of LLC resonant converter of wide input voltage range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811176061.8A CN109327144A (en) | 2018-10-10 | 2018-10-10 | A kind of LLC resonant converter of wide input voltage range |
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| CN109327144A true CN109327144A (en) | 2019-02-12 |
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| CN201811176061.8A Pending CN109327144A (en) | 2018-10-10 | 2018-10-10 | A kind of LLC resonant converter of wide input voltage range |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111211696A (en) * | 2020-01-17 | 2020-05-29 | 毛昭祺 | Control method and device of resonant circuit and electronic equipment |
| CN111884510A (en) * | 2019-09-29 | 2020-11-03 | 株洲中车时代电气股份有限公司 | Gain frequency modulation method and related device |
| CN116633160A (en) * | 2023-07-26 | 2023-08-22 | 南京航空航天大学 | Single-stage isolated bidirectional/unidirectional DC-DC converter and control method |
-
2018
- 2018-10-10 CN CN201811176061.8A patent/CN109327144A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884510A (en) * | 2019-09-29 | 2020-11-03 | 株洲中车时代电气股份有限公司 | Gain frequency modulation method and related device |
| CN111884510B (en) * | 2019-09-29 | 2022-02-11 | 株洲中车时代电气股份有限公司 | Gain frequency modulation method and related device |
| CN111211696A (en) * | 2020-01-17 | 2020-05-29 | 毛昭祺 | Control method and device of resonant circuit and electronic equipment |
| CN116633160A (en) * | 2023-07-26 | 2023-08-22 | 南京航空航天大学 | Single-stage isolated bidirectional/unidirectional DC-DC converter and control method |
| CN116633160B (en) * | 2023-07-26 | 2023-09-26 | 南京航空航天大学 | Single-stage isolated bidirectional/unidirectional DC-DC converter and control method |
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