CN208337415U - The double LLC resonant converters of a kind of and cascaded structure full-bridge - Google Patents
The double LLC resonant converters of a kind of and cascaded structure full-bridge Download PDFInfo
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- CN208337415U CN208337415U CN201821128433.5U CN201821128433U CN208337415U CN 208337415 U CN208337415 U CN 208337415U CN 201821128433 U CN201821128433 U CN 201821128433U CN 208337415 U CN208337415 U CN 208337415U
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- llc resonance
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Abstract
The utility model discloses the double LLC resonant converters of a kind of and cascaded structure full-bridge, it is related to applied power electronics technical field, comprising: input DC power, inverter circuit, double LLC resonance circuits, auxiliary resonance inductance network, current rectifying and wave filtering circuit and power battery load；The input terminal of the inverter circuit is connected with the input DC power, and the current rectifying and wave filtering circuit is connected with the transformer secondary output winding in double LLC resonance circuits, and the power battery load is connected with the output end of the current rectifying and wave filtering circuit.The concatenated structure of rectifier bridge in double LLC resonance circuits parallel connections, current rectifying and wave filtering circuit can reduce the voltage stress of turn ratio and rectifier diode between primary, secondary, be conducive to reduce magnetic core of transformer volume, increasing heat radiation area.
Description
Technical field
The utility model relates to applied power electronics technical field, especially a kind of and cascaded structure double LLC of full-bridge are humorous
Shake converter.
Background technique
In recent years, in order to achieve the purpose that reduce gasoline consumption and obtain better energy management, plug-in hybrid
Automobile and pure electric automobile are more and more welcomed by the people.Vehicular charger has the characteristics that high-efficient and power density is big, is
Indispensable part in plug-in hybrid-power automobile and pure electric automobile.Nowadays, Vehicular charger is generally configured to two-stage
Structure, prime are AC/DC converter, and rear class is isolated DC/DC converter.Because LLC resonant converter becomes compared with phase-shifting full-bridge
Parallel operation has the advantage of switching tube Sofe Switch, and present isolated DC/DC converter generally uses LLC resonant converter.For complete
Bridge LLC resonant converter, there are three types of control methods for general tool: Frequency control, phase shifting control and variable-structure control.Frequency control
System can make controlled resonant converter obtain broader output voltage range, reduce voltage output ripple, but when controlled resonant converter switchs
When frequency is not resonance frequency, the advantages that it will lose low switching losses, low circulation, while wide in range switching frequency transformation range
The design for also leading to magnetic original part becomes especially complicated.LLC resonant converter can be improved in energy at light load in phase shifting control
Transfer efficiency is measured, but the high cut-off current of primary switch pipe will will lead to when overloaded.Improve LLC resonant converter structure
It is being widely studied to reach the method for improving transfer efficiency and power density.
It is generally equipped with power battery on plug-in hybrid-power automobile and pure electric automobile, is giving power battery charging mistake
Cheng Zhonghui undergoes constant-voltage charge and constant-current charge two states, and equivalent load of power battery can be with its both ends during this
Voltage, electric current variation and change.When the switching frequency of LLC resonance circuit deviates resonance frequency, that LLC resonance circuit is with regard to easy
In work in light condition, the reduction of energy conversion efficiency is caused.In addition, because the power that DC/DC converter needs to transmit increases
Greatly, the design difficulty of transformer increases, and volume is excessive, and heat dissipation problem is difficult to be resolved.
Utility model content
The utility model regarding to the issue above and technical need, proposes the double LLC resonance of a kind of and cascaded structure full-bridge
Converter.
The technical solution of the utility model is as follows:
The double LLC resonant converters of a kind of and cascaded structure full-bridge, comprising: input DC power, inverter circuit, double LLC
Resonance circuit, auxiliary resonance inductance network, current rectifying and wave filtering circuit and power battery load；
The input terminal of the inverter circuit is connected with the input DC power, the current rectifying and wave filtering circuit and described double
Transformer secondary output winding in LLC resonance circuit is connected, the output end of the power battery load and the current rectifying and wave filtering circuit
It is connected.
Its further technical solution are as follows: it is characterized in that, double LLC resonance circuits include upper LLC resonance circuit and
Lower LLC resonance circuit, the upper LLC resonance circuit include the first external resonant inductance being sequentially connected in series, the first magnetizing inductance,
The input terminal of one external resonant capacitance, the upper LLC resonance circuit is connected with the output end of the inverter circuit；The lower LLC
Resonance circuit includes the second external resonant inductance, the second magnetizing inductance, the second external resonant capacitance being sequentially connected in series, under described
Two input terminals of LLC resonance circuit are connected with the inverter circuit and the auxiliary resonance inductance network respectively.
Its further technical solution are as follows: the upper LLC resonance circuit and the lower LLC resonance circuit share predetermined switch
Frequency, the upper LLC resonance circuit keep first switch frequency constant, and the lower LLC resonance circuit is in constant current and constant-voltage charge
In the case where, respectively correspond different second switch frequency and third switching frequency；
The predetermined switch frequency, the first switch frequency, the second switch frequency and the third switching frequency
Equal, keeping duty ratio is 50%.
Its further technical solution are as follows: the auxiliary resonance inductance network is by two groups of switching networks and auxiliary induction group
At switching network described in every group includes switching tube, corresponding body diode and corresponding junction capacity, the switching tube, described
Body diode and the junction capacity three are in parallel；Switching network differential concatenation described in two groups, it is in parallel with the auxiliary induction.
Its further technical solution are as follows: the current rectifying and wave filtering circuit is by two groups of full-bridge rectification diodes, the first filtered electrical
Hold and the second filter capacitor composition, full-bridge rectification diode described in every group include 4 rectifier diodes；Full-bridge described in first group is whole
Stream diode input terminal be connected with the secondary coil of the first transformer in double LLC resonance circuits, output end with it is described
First filter capacitor is in parallel；The input terminal of full-bridge rectification diode described in second group and second in double LLC resonance circuits
The secondary coil of transformer is connected, and output end is in parallel with second filter capacitor；First filter capacitor, second filter
Wave capacitor and power battery load three are sequentially connected in series.
The advantageous effects of the utility model are:
Double LLC resonance circuits are in parallel, the concatenated structure of rectifier bridge in current rectifying and wave filtering circuit can reduce primary,
The voltage stress of turn ratio and rectifier diode between secondary is conducive to reduce magnetic core of transformer volume, increasing heat radiation area, drop
The voltage stress of low diode, be suitable in high-power occasion, use variable-structure control, pass through detection power battery output
Voltage determines that circuit enters the charged state of constant current or constant pressure, reduces influence of the power battery relative load variation to gain,
The transfer efficiency for improving energy reduces the design difficulty of magnetic element.
Detailed description of the invention
Fig. 1 is the circuit of the double LLC resonant converters of a kind of and cascaded structure full-bridge provided by the embodiment of the utility model
Figure.
Fig. 2 is a kind of double exchanges etc. of the LLC resonance circuit in constant-current charge of full-bridge provided by the embodiment of the utility model
Imitate circuit diagram.
Fig. 3 is a kind of double exchanges etc. of the LLC resonance circuit in constant-voltage charge of full-bridge provided by the embodiment of the utility model
Imitate circuit diagram.
Specific embodiment
Specific embodiments of the utility model will be further explained with reference to the accompanying drawing.
Fig. 1 is the circuit of the double LLC resonant converters of a kind of and cascaded structure full-bridge provided by the embodiment of the utility model
Figure, as shown in Figure 1, should and the double LLC resonant converters of full-bridge of cascaded structure include and the double LLC resonance electricity of the full-bridge of cascaded structure
Road, should and cascaded structure the double LLC resonance circuits of full-bridge include input DC power 1, inverter circuit 2, double LLC resonance circuits 3,
Auxiliary resonance inductance network 4, current rectifying and wave filtering circuit 5 and power battery load 6.
The input terminal of inverter circuit 2 is connected with input DC power 1, in current rectifying and wave filtering circuit 5 and double LLC resonance circuits
Transformer secondary output winding is connected, and power battery load 6 is connected with the output end of current rectifying and wave filtering circuit 5.
Optionally, input DC power 1 is the DC voltage V of 400Vin。
Optionally, inverter circuit 2 includes four groups of switching networks, and every group of switch network includes a switching tube, corresponding body
Diode and corresponding junction capacity, illustratively, referring to Figure 1, switching tube S1, body diode Do1With junction capacity C1Three is simultaneously
Connection one switching network of composition, switching tube S2, body diode Do2With junction capacity C2Three composes in parallel a switching network, switch
Pipe S3, body diode Do3With junction capacity C3Three composes in parallel a switching network, switching tube S4, body diode Do4And junction capacity
C4Three composes in parallel a switching network.
Optionally, double LLC resonance circuits 3 include upper LLC resonance circuit and lower LLC resonance circuit, upper LLC resonance circuit packet
Include the external resonant inductance L of first be sequentially connected in seriesr1, the first magnetizing inductance Lm1, the first external resonant capacitance Cr1, upper LLC resonance electricity
The input terminal on road is connected with the output end of inverter circuit 2；Lower LLC resonance circuit includes the second external resonant inductance being sequentially connected in series
Lr2, the second magnetizing inductance Lm2, the second external resonant capacitance Cr2, two input terminals of lower LLC resonance circuit respectively with inverter circuit
2 are connected with auxiliary resonance inductance network 4.
Optionally, auxiliary resonance inductance network 4 is made of two groups of switching networks and auxiliary induction, and every group of switching network includes
Switching tube, corresponding body diode and corresponding junction capacity, illustratively, switching tube S5, body diode Do5With junction capacity C5
Three is in parallel, switching tube S6, body diode Do6With junction capacity C6Three is in parallel；Two groups of switching network differential concatenations, then with auxiliary
Inductance Lr3It is in parallel.
Optionally, current rectifying and wave filtering circuit 5 is by two groups of full-bridge rectification diodes, the first filter capacitor and the second filter capacitor group
At, every group of full-bridge rectification diode includes 4 rectifier diodes, illustratively, referring to Figure 1, first group of two pole of full-bridge rectification
Pipe includes rectifier diode D1, rectifier diode D2, rectifier diode D3With rectifier diode D4, second group of two pole of full-bridge rectification
Pipe includes rectifier diode D5, rectifier diode D6, rectifier diode D7With rectifier diode D8；First group of two pole of full-bridge rectification
The first transformer T in the input terminal of pipe and double LLC resonance circuits 31Secondary coil be connected, output end and the first filter capacitor
Co1It is in parallel；The second transformer T in the input terminal of second group of full-bridge rectification diode and double LLC resonance circuits 32Secondary coil
It is connected, output end and the second filter capacitor Co2It is in parallel；First filter capacitor Co1, the second filter capacitor Co2With power battery load 6
Three is sequentially connected in series.
Optionally, power battery load 6 is equivalent to a variable resistance ReWith capacitor Ce。
Optionally, upper LLC resonance circuit and lower LLC resonance circuit share predetermined switch frequency fs, upper LLC resonance circuit guarantor
Hold first switch frequency fr1Constant, lower LLC resonance circuit respectively corresponds different second in the case where constant current and constant-voltage charge
Switching frequency fr2With third switching frequency fr3.Predetermined switch frequency fs, first switch frequency fr1, second switch frequency fr2With
Three switching frequency fr3It is equal, i.e. fs=fr1=fr2=fr3, keeping duty ratio is 50%.
Wherein, first switch frequency
Second switch frequency
Third switching frequency
It is that a kind of double LLC resonance circuits of full-bridge provided by the embodiment of the utility model are filled in constant current in conjunction with reference Fig. 2, Fig. 2
Ac equivalent circuit figure when electric.For upper LLC resonance circuit, the first transformer T1It is primary transmit energy to secondary, first
Magnetizing inductance Lm1It is clamped, the only first external resonant inductance Lr1, the first external resonant capacitance Cr1Participate in resonance, resonance frequency
For first switch frequency fr1, and secondary output voltage is unrelated with power battery load 6, is equivalent to a voltage source；For lower LLC
Resonance circuit, the second transformer T2Energy, the second external resonant inductance L are not transmitted to secondaryr2, the second magnetizing inductance Lm2, second
External resonant capacitance Cr2Resonance is participated in, resonance frequency is second switch frequency fr2, and secondary output current and power battery are equivalent
It loads unrelated, is equivalent to a current source.
It is that a kind of double LLC resonance circuits of full-bridge provided by the embodiment of the utility model are filled in constant pressure in conjunction with reference Fig. 3, Fig. 3
Ac equivalent circuit figure when electric.For upper LLC resonance circuit, the first transformer T1It is primary transmit energy to secondary, first
Magnetizing inductance Lm1It is clamped, the only first external resonant inductance Lr1, the first external resonant capacitance Cr1Participate in resonance, resonance frequency
For first switch frequency fr1, and secondary output voltage is unrelated with power battery equivalent load, is equivalent to a voltage source；For under
LLC resonance circuit, the second transformer T2Energy, the second external resonant inductance L are not transmitted to secondaryr2, the second magnetizing inductance Lm2,
Two external resonant capacitance Cr2Resonance is participated in, resonance frequency is third switching frequency fr3, and secondary output voltage and power battery etc.
Effect load is unrelated, is equivalent to a voltage source.
To in this present embodiment and cascaded structure the double LLC resonance circuits of full-bridge control, can be by judging full-bridge
Whether the output voltage of double LLC resonance circuits reaches 420V, if reaching, opens the switching tube in auxiliary resonance inductance network 4
S5With switching tube S6, carry out constant-voltage charge；If not up to, keeping the switching tube S in auxiliary resonance inductance network 45And switching tube
S6Shutdown carries out constant-current charge.
In conclusion in the double LLC resonant converters of provided by the embodiment of the utility model and cascaded structure full-bridge, it is primary
Upper LLC resonance circuit and lower LLC resonance circuit are in parallel, secondary two rectifier bridges series connection, so that the double LLC resonant converters of full-bridge exist
Under constant current state, primary switching devices meet no-voltage and open and approximate zero-current switching, under pressure constant state, primary switch device
Part meets zero voltage switch.Double LLC resonance circuits are in parallel, the concatenated structure of rectifier bridge can reduce primary, between secondary
Turn ratio and rectifier diode voltage stress, entire circuit always works at resonance frequency.
Double LLC resonance circuits are in parallel, the concatenated structure of rectifier bridge in current rectifying and wave filtering circuit can reduce primary,
The voltage stress of turn ratio and rectifier diode between secondary is conducive to reduce magnetic core of transformer volume, increasing heat radiation area, drop
The voltage stress of low diode, be suitable in high-power occasion, use variable-structure control, pass through detection power battery output
Voltage determines that circuit enters the charged state of constant current or constant pressure, reduces influence of the power battery relative load variation to gain,
The transfer efficiency for improving energy reduces the design difficulty of magnetic element.
Above-described is only the preferred embodiments of the utility model, and the utility model is not limited to above embodiments.It can
To understand, what those skilled in the art directly exported or associated under the premise of not departing from the spirit and design of the utility model
Oher improvements and changes are considered as being included within the scope of protection of this utility model.
Claims (5)
1. a kind of and cascaded structure the double LLC resonant converters of full-bridge characterized by comprising input DC power, inversion electricity
Road, double LLC resonance circuits, auxiliary resonance inductance network, current rectifying and wave filtering circuit and power battery load；
The input terminal of the inverter circuit is connected with the input DC power, and the current rectifying and wave filtering circuit and double LLC are humorous
Transformer secondary output winding in vibration circuit is connected, and the power battery load is connected with the output end of the current rectifying and wave filtering circuit.
2. the double LLC resonant converters of according to claim 1 and cascaded structure full-bridge, which is characterized in that double LLC
Resonance circuit includes upper LLC resonance circuit and lower LLC resonance circuit, and the upper LLC resonance circuit includes first be sequentially connected in series
External resonant inductance, the first magnetizing inductance, the first external resonant capacitance, the input terminal of the upper LLC resonance circuit with it is described inverse
The output end on power transformation road is connected；The lower LLC resonance circuit includes the second external resonant inductance being sequentially connected in series, the second excitation electricity
Sense, the second external resonant capacitance, two input terminals of the lower LLC resonance circuit respectively with the inverter circuit and the auxiliary
Resonant inductance network is connected.
3. the double LLC resonant converters of according to claim 2 and cascaded structure full-bridge, which is characterized in that the upper LLC
Resonance circuit and the lower LLC resonance circuit share predetermined switch frequency, and the upper LLC resonance circuit keeps first switch frequency
Constant, the lower LLC resonance circuit respectively corresponds different second switch frequencies and in the case where constant current and constant-voltage charge
Three switching frequencies；
The predetermined switch frequency, the first switch frequency, the second switch frequency and the third switching frequency are equal,
Keeping duty ratio is 50%.
4. the double LLC resonant converters of according to claim 1 and cascaded structure full-bridge, which is characterized in that the auxiliary
Resonant inductance network is made of two groups of switching networks and auxiliary induction, and switching network described in every group includes switching tube, corresponding body
Diode and corresponding junction capacity, the switching tube, the body diode and the junction capacity three are in parallel；It is opened described in two groups
Network differential concatenation is closed, it is in parallel with the auxiliary induction.
5. the double LLC resonant converters of according to claim 1 and cascaded structure full-bridge, which is characterized in that the rectification
Filter circuit is made of two groups of full-bridge rectification diodes, the first filter capacitor and the second filter capacitor, full-bridge rectification described in every group
Diode includes 4 rectifier diodes；In the input terminal of full-bridge rectification diode described in first group and double LLC resonance circuits
The first transformer secondary coil be connected, output end is in parallel with first filter capacitor；Full-bridge rectification two described in second group
The input terminal of pole pipe is connected with the secondary coil of the second transformer in double LLC resonance circuits, output end and described second
Filter capacitor is in parallel；First filter capacitor, second filter capacitor and power battery load three are sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821128433.5U CN208337415U (en) | 2018-07-16 | 2018-07-16 | The double LLC resonant converters of a kind of and cascaded structure full-bridge |
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| CN201821128433.5U CN208337415U (en) | 2018-07-16 | 2018-07-16 | The double LLC resonant converters of a kind of and cascaded structure full-bridge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138242A (en) * | 2019-05-23 | 2019-08-16 | 北京动力源科技股份有限公司 | A kind of series rectifier topological structure and a kind of LLC resonance circuit |
| CN112202332A (en) * | 2020-11-30 | 2021-01-08 | 深圳英飞源技术有限公司 | Full-bridge filter circuit, direct current converter and charging terminal |
| CN113162136A (en) * | 2021-03-04 | 2021-07-23 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and method |
-
2018
- 2018-07-16 CN CN201821128433.5U patent/CN208337415U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110138242A (en) * | 2019-05-23 | 2019-08-16 | 北京动力源科技股份有限公司 | A kind of series rectifier topological structure and a kind of LLC resonance circuit |
| CN112202332A (en) * | 2020-11-30 | 2021-01-08 | 深圳英飞源技术有限公司 | Full-bridge filter circuit, direct current converter and charging terminal |
| CN113162136A (en) * | 2021-03-04 | 2021-07-23 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and method |
| CN113162136B (en) * | 2021-03-04 | 2022-12-16 | 广西电网有限责任公司电力科学研究院 | Wireless charging system and method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190104 Termination date: 20210716 |