CN209676129U - A kind of resonance high-gain DC-DC device based on loosely coupled transformer - Google Patents
A kind of resonance high-gain DC-DC device based on loosely coupled transformer Download PDFInfo
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- CN209676129U CN209676129U CN201920679979.8U CN201920679979U CN209676129U CN 209676129 U CN209676129 U CN 209676129U CN 201920679979 U CN201920679979 U CN 201920679979U CN 209676129 U CN209676129 U CN 209676129U
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Abstract
The utility model discloses a kind of resonance high-gain DC-DC device based on loosely coupled transformer is made of high-frequency inverter circuit, resonator circuit and rectification with filter circuit；DC power supply accesses resonator circuit after high-frequency inverter circuit is reverse into high frequency square wave power supply, and resonator circuit is the resonant network being made of the resonance compensation capacitor of loosely coupled transformer and the primary and secondary side for being separately positioned on loosely coupled transformer；The secondary side magnetic field coupling of original of the high frequency square wave power supply through loosely coupled transformer realizes energy transmission, resonator circuit is arranged to work in resonant state, and the switching frequency of high-frequency inverter circuit is identical as the self-resonant frequency of resonator circuit, using rectification and filter circuit as receiving side, the high frequency square wave source of receiving side is transferred to through loosely coupled transformer, it is being changed into DC voltage source after over commutation and filter circuit, is realizing resonance high-gain DC-DC conversion；Its circuit topology is simple, and high-gain DC-DC transformation can be realized in one-stage transfor-mation, and loss is low, power density is big, work efficiency is high.
Description
Technical field
The utility model belongs to power electronics field, is related to isolated high-gain DC-DC voltage changer, more specifically
It is a kind of resonance high-gain DC-DC device based on loosely coupled transformer that ground, which is said,.
Background technique
With the worsening of global environment and it is becoming tight energy day, the importance for cleaning reproducible new energy is further convex
Aobvious, power electronic technique is the core technology of new energy transformation, and in power electronic technique, DC-DC converter is in occupation of important
Position.Since the output voltages such as photovoltaic cell, fuel cell are lower, the voltage of single battery even only 3V or so, how
Realize that high gain boost transformation is that renewable energy utilization needs to solve major issue in the process.
For ideal Boost, when duty ratio is close to 1, gain is close to infinity, and in reality
In the circuit of border, excessively high duty ratio will lead to biggish peak voltage when transducer effciency is lower and can bring switch on and off,
And excessively high dv/dt will lead to a series of problems, such as EMI becomes larger, furthermore in actual circuit due to the influence of parasitic parameter, when
When step-up ratio reaches 6-8, voltage can not just continue to rise.Many solution party are proposed for this phenomenon domestic and foreign scholars
Case.The solution of mainstream can be divided into two major classes, and boost DC-DC converter classification is as shown in Figure 5.
The first kind is that step-up ratio is improved by the cascade and topological combination of converter, and such as boost and boost are cascaded
(as shown in Figure 6), boost and flyback cascade (as shown in Figure 7), boost and bridge-type DC cascade, voltage multiplie interleaved boost become
The schemes such as parallel operation；This method there are the problem of mainly have a two o'clock, first point is that transducer effciency after combination is equal to prime
Transducer effciency can reduce the total efficiency of converter multiplied by rear class transducer effciency, the structure of such multi-stag；Second point is to become
When parallel operation cascades the problem of impedance matching.Generally when converter cascades, front stage converter is referred to as source converter, the change of rear class
Parallel operation is referred to as load converter, and source converter and load converter are stable when independently working, but they are formed
Cascade system potentially unstable, this is mainly due to the output impedances of the negative resistance character of load converter and source no-load voltage ratio device not
Caused by matching, for source converter, load converter normally behaves as constant output characteristic, when input voltage rises,
Input current will reduce, and the input impedance of load converter at this time is equivalent to be a negative impedance.Converter works in grade
Gang mould formula can reduce the stability of system, increase the design difficulty of the control loop of system.
Second class is the DC converter using transformer isolation, such as flyback converter (as shown in Figure 8), forward conversion
Device, bridge-type DC converter etc., can be directly by changing the turn ratio of transformer, the step-up ratio of Lai Tigao converter, to obtain
One higher voltage gain.Main problem existing for this high no-load voltage ratio transformer is that low-voltage, high-current characteristic is presented in low-pressure side
And high pressure low current characteristic is presented in high-pressure side, this has higher requirement to the stress of switching device；Furthermore excessively high turn ratio meeting
Cause system efficiency under full load conditions to be lower, and the number of turns excessive when transformer winding generate grade between parasitic parameter to high frequency
The converter of work can also produce bigger effect, and excessive the number of turns can also increase difficulty to the production of transformer.
Existing high-gain DC converter is lower in the prevalence of efficiency, and control loop design is complicated, and job stability is low,
The problems such as design of transformer difficulty is big.
Utility model content
The utility model is provided a kind of based on loosely coupled transformer to avoid above-mentioned deficiency of the prior art
Resonance high-gain DC-DC device, with optimize in the prior art circuit structure there is transducer effciency it is lower, control loop is set
Meter is complicated, and job stability is low, the big problem of design of transformer difficulty.
The utility model adopts the following technical scheme that in order to solve the technical problem
The utility model based on loosely coupled transformer resonance high-gain DC-DC device the characteristics of be: by high-frequency inversion electricity
Road, resonator circuit and rectification are sequentially connected composition with filter circuit；DC power supply is reverse into high frequency by high-frequency inverter circuit
Resonator circuit is accessed after square wave power, the resonator circuit is by loosely coupled transformer and to be separately positioned on loose coupling transformation
The resonant network that the resonance compensation capacitor of the primary and secondary side of device is constituted；The original of the high frequency square wave power supply through loosely coupled transformer
Secondary side magnetic field coupling realizes energy transmission, the resonator circuit work is arranged in resonant state, and the high-frequency inversion is electric
The switching frequency on road and the self-resonant frequency of resonator circuit are identical, using the rectification and filter circuit as secondary side, through loose coupling
The high frequency square wave source that transformer is transferred to receiving side is closed, is being changed into DC voltage source after the rectification and filter circuit,
Realize resonance high-gain DC-DC conversion.
The utility model based on loosely coupled transformer resonance high-gain DC-DC device the characteristics of lie also in:
The high-frequency inverter circuit is by switching tube Q1Source level and switching tube Q3Drain be connected to inverter circuit A output
End forms the first branch, switching tube Q2Source electrode and switching tube Q4Drain electrode be connected to inverter circuit B output end formed second
Road constitutes high-frequency inverter circuit, the input terminal of the high-frequency inverter circuit by the first branch and second branch are parallel with one another
The both ends of DC power supply are connected to, the output end of the high-frequency inverter circuit is connected with resonator circuit；
The resonator circuit is by loosely coupled transformer T1Original side of the same name and resonance compensation capacitor C1One end be connected
It connects, the resonance compensation capacitor C1The other end be connected with high-frequency inverter circuit A output end, loosely coupled transformer T1Primary side it is different
Name end is connected with the B output end of the high-frequency inverter circuit；The loosely coupled transformer T1Secondary side Same Name of Ends and resonance compensation
Capacitor C2One end be connected, the resonance compensation capacitor C2The other end be connected with a input terminal of rectification circuit, the institute
State loosely coupled transformer T1Secondary side different name end be connected with the b input terminal of the rectification circuit；
The loosely coupled transformer T1Primary inductor L1With resonance compensation capacitor C1Resonance frequency and high-frequency inverter circuit
Switching frequency it is identical, make the primary inductor L1With resonance compensation capacitor C1Series resonance occurs, the exciting current of generation is most
Greatly, the intensity and density in magnetic field are also maximum；The loosely coupled transformer T1Secondary side and primary side be symmetrical structure, i.e. institute
State resonance compensation capacitor C1Value and resonance compensation capacitor C2Value it is identical, primary inductor L1With secondary inductance L2Value it is identical, make
The loosely coupled transformer T1Secondary side be also at resonant state；
The high-frequency rectification and filter circuit are by diode D1, diode D2, diode D3, diode D4And filtered electrical
Hold CoIt constitutes, wherein diode D1Cathode and diode D2Cathode jointly with filter capacitor CoOne end be connected, two poles
Pipe D3Anode and diode D4Anode and filter capacitor CoThe other end be connected, and be connected to the output low-pressure side；Two poles
Pipe D1Anode and diode D3Cathode be connected to a input terminal, diode D2Anode and diode D4Cathode be connected to b
Input terminal.
The utility model based on loosely coupled transformer resonance high-gain DC-DC device the characteristics of lie also in: using primary
The control mode of side control or secondary side control, for controlling the voltage swing of load end；The primary side control, which refers to, to be passed through
The method of primary side phase shift adjusts the size of output voltage, i.e. the phase shifting angle of control primary side high-frequency inversion realizes output voltage control
System；The secondary side control refers to by the diode D3And D4Both ends correspond paralleling switch pipe Q5And Q6, utilize
Switching tube Q5And Q6The time of on-off controls output voltage simultaneously.
The utility model based on loosely coupled transformer resonance high-gain DC-DC device the characteristics of lie also in: in loose coupling
Dielectric is added between the primary and secondary side of transformer, solves the Insulation Problems of transformer.
Compared with the prior art, the utility model has the beneficial effect that:
1, the utility model circuit topology is simple, it is only necessary to which high-gain, control loop design letter can be realized in one-stage transfor-mation
It is single, avoid resistance matching problem when converter cascade；
2, in resonant state, switching loss is low for converter work in the utility model, is conducive to the volume for reducing radiator,
Power density is also improved simultaneously, work efficiency is high for converter；
3, since current source characteristic is presented in resonator circuit output end in the utility model circuit, output voltage does not depend on
In the turn ratio of loosely coupled transformer, this also solves close coupling transformer isolation formula high-gain DC converter when turn ratio is very big
When coiling grade between problem and transformer manufacture difficulty brought by parasitic parameter the problem of increasing.
4, insulation can be added in centre since the former secondary side breath of loosely coupled transformer is larger in the utility model circuit and be situated between
Matter can solve the Insulation Problems of transformer.
Detailed description of the invention
Fig. 1 is utility model device schematic diagram；
Fig. 2 is utility model device medium-high frequency inverter circuit theory output voltage current waveform；
Fig. 3 is loosely coupled transformer structural schematic diagram in utility model device；
Fig. 4 is receiving end power control principle figure in utility model device；
Fig. 5 is boost DC-DC topological sorting figure common in the art；
Fig. 6 is boost tandem type high-gain DC circuit diagram in the prior art；
Fig. 7 is boost in the prior art and flyback combined type high-gain DC circuit diagram；
Fig. 8 is flyback converter schematic diagram in the prior art.
Specific embodiment
Referring to Fig. 1, the resonance high-gain DC-DC device in the present embodiment based on loosely coupled transformer is by high-frequency inversion electricity
Road, resonator circuit and rectification are sequentially connected composition with filter circuit；DC power supply is reverse into high frequency by high-frequency inverter circuit
Resonator circuit is accessed after square wave power, resonator circuit is by loosely coupled transformer and to be separately positioned on loosely coupled transformer
The resonant network that the resonance compensation capacitor of primary and secondary side is constituted；Original secondary side magnetic field of the high frequency square wave power supply through loosely coupled transformer
Energy transmission is realized in coupling, and setting resonator circuit works in resonant state, and the switching frequency of high-frequency inverter circuit with it is humorous
The self-resonant frequency of vibration device circuit is identical, using rectification and filter circuit as secondary side, is transferred to receiving side through loosely coupled transformer
High frequency square wave source, be changed into DC voltage source after over commutation and filter circuit, realizing resonance high-gain DC-DC conversion.
In specific implementation, as shown in Figure 1:
High-frequency inverter circuit is by switching tube Q1Source level and switching tube Q3Drain be connected to inverter circuit A output end shape
At the first branch, switching tube Q2Source electrode and switching tube Q4Drain electrode be connected to inverter circuit B output end formed second branch, by
The first branch and second branch composition high-frequency inverter circuit parallel with one another, the input terminal of high-frequency inverter circuit are connected to DC power supply
Both ends, the output end of high-frequency inverter circuit is connected with resonator circuit.
Resonator circuit is by loosely coupled transformer T1Original side of the same name and resonance compensation capacitor C1One end be connected,
Resonance compensation capacitor C1The other end be connected with high-frequency inverter circuit A output end, loosely coupled transformer T1Primary side different name end and high
The B output end of frequency inverter circuit is connected；Loosely coupled transformer T1Secondary side Same Name of Ends and resonance compensation capacitor C2One end be connected
It connects, resonance compensation capacitor C2The other end be connected with a input terminal of rectification circuit, loosely coupled transformer T1Secondary side different name end
It is connected with the b input terminal of rectification circuit.
Loosely coupled transformer T1Primary inductor L1With resonance compensation capacitor C1Resonance frequency and high-frequency inverter circuit open
It is identical to close frequency, makes primary inductor L1With resonance compensation capacitor C1Series resonance occurs, the exciting current of generation is maximum, magnetic field
Intensity and density are also maximum；Loosely coupled transformer T1Secondary side and primary side be symmetrical structure, i.e. resonance compensation capacitor C1's
Value and resonance compensation capacitor C2Value it is identical, primary inductor L1With secondary inductance L2Value it is identical, make loosely coupled transformer T1Two
Secondary side is also at resonant state；
High-frequency rectification and filter circuit are by diode D1, diode D2, diode D3, diode D4With filter capacitor CoStructure
At, wherein diode D1Cathode and diode D2Cathode jointly with filter capacitor CoOne end be connected, diode D3's
Anode and diode D4Anode and filter capacitor CoThe other end be connected, and be connected to the output low-pressure side；Diode D1's
Anode and diode D3Cathode be connected to a input terminal, diode D2Anode and diode D4Cathode be connected to b input terminal.
The theoretical output voltage current waveform of the present embodiment medium-high frequency inverter circuit is as shown in Fig. 2, high-frequency inverter circuit work
Make process: when DC power supply passes through full bridge inverter, switching tube Q1With switching tube Q4On-off, switching tube Q simultaneously2And switching tube
Q3On-off simultaneously, switching tube Q1、Q4With switching tube Q2、Q3180 degree alternate conduction is differed, DC power supply is converted into positive-negative half-cycle pair
The square wave power of title, since converter works in resonant state, output voltage and the electric current of high-frequency inverter circuit are same phases.
Loosely coupled transformer such as Fig. 3 illustrates in resonator circuit, in specific implementation, due to the secondary side of the original of loosely coupled transformer
Breath is larger, dielectric 3 can be added between primary side 1 and secondary side 2, effectively solve the Insulation Problems of transformer.
The resonator circuit course of work: loosely coupled transformer plays the role of the coupled transfer of energy, high frequency square wave power supply
When being linked into loosely coupled transformer, the electric field of high frequency conversion can inspire changing magnetic field, and changing magnetic field is in meeting in loose coupling
The secondary side of transformer induces electromotive force, and energy realizes transmission by the coupling in magnetic field between former secondary side, if resonator circuit
The exciting current then generated under resonance condition that works is maximum, and magnetic field strength and magnetic flux density are also maximum, in order to make converter
Resonance compensation network is arranged in resonant state in work, and switching frequency and the resonator circuit self-resonance of converter work is arranged
Frequency is identical, and when resonator circuit input frequency square wave power identical with own resonance frequency, circuit will be in resonance shape
State, since current source characteristic is presented in the output of resonant network, so may be implemented when the resistance value of load end is sufficiently large very high
Voltage gain.When circuit is in when overloaded, at this point for being in current-limiting protection state for voltage source, converter is protected with current limliting
The mode of shield works, and when bearing power is less than rated power, very high voltage gain can be reached, be transmitted to by control
The size of current of load end realizes the adjusting to output power.
Control is transmitted to the size of current of load end there are mainly two types of mode, is that primary side controls and secondary side control respectively
System, primary side control is the size that output voltage is adjusted by the method for phase shift, the high frequency for the utility model circuit
The voltage of inversion output determines the output electric current of resonator circuit, and then controls output voltage stabilization in nominal value range,
Therefore output voltage control can be realized by controlling the phase shifting angle of primary side high-frequency inversion；Secondary side control is by two poles
Pipe D3And D4Both ends correspond paralleling switch pipe Q5And Q6, utilize switching tube Q5And Q6The time control output electricity of on-off simultaneously
Pressure, control principle are as shown in Figure 4.
Converter boost is by the turn ratio of loosely coupled transformer than not determined in the utility model, therefore theoretically can be real
The now very DC-DC transformation of high-gain.
Claims (4)
1. a kind of resonance high-gain DC-DC device based on loosely coupled transformer, it is characterized in that: by high-frequency inverter circuit, resonance
Device circuit and rectification and filter circuit are sequentially connected composition；DC power supply is reverse into high frequency square wave power supply by high-frequency inverter circuit
After access resonator circuit, the resonator circuit is by loosely coupled transformer and the primary side for being separately positioned on loosely coupled transformer
The resonant network constituted with the resonance compensation capacitor on secondary side；Original secondary side magnetic field of the high frequency square wave power supply through loosely coupled transformer
Energy transmission is realized in coupling, and the resonator circuit is arranged and works in resonant state, and the switch of the high-frequency inverter circuit
Frequency is identical as the self-resonant frequency of resonator circuit, using the rectification and filter circuit as secondary side, through loosely coupled transformer
It is transferred to the high frequency square wave source of receiving side, is being changed into DC voltage source after the rectification and filter circuit, is realizing resonance
High-gain DC-DC conversion.
2. the resonance high-gain DC-DC device according to claim 1 based on loosely coupled transformer, it is characterized in that:
The high-frequency inverter circuit is by switching tube Q1Source level and switching tube Q3Drain be connected to inverter circuit A output end shape
At the first branch, switching tube Q2Source electrode and switching tube Q4Drain electrode be connected to inverter circuit B output end formed second branch, by
The first branch and second branch composition high-frequency inverter circuit parallel with one another, the input terminal of the high-frequency inverter circuit are connected to
The output end at the both ends of DC power supply, the high-frequency inverter circuit is connected with resonator circuit；
The resonator circuit is by loosely coupled transformer T1Original side of the same name and resonance compensation capacitor C1One end be connected,
The resonance compensation capacitor C1The other end be connected with high-frequency inverter circuit A output end, loosely coupled transformer T1Primary side different name end
It is connected with the B output end of the high-frequency inverter circuit；The loosely coupled transformer T1Secondary side Same Name of Ends and resonance compensation capacitor C2
One end be connected, the resonance compensation capacitor C2The other end be connected with a input terminal of rectification circuit, the loose coupling becomes
Depressor T1Secondary side different name end be connected with the b input terminal of the rectification circuit；
The loosely coupled transformer T1Primary inductor L1With resonance compensation capacitor C1Resonance frequency and high-frequency inverter circuit open
It is identical to close frequency, makes the primary inductor L1With resonance compensation capacitor C1Series resonance occurs, the exciting current of generation is maximum, magnetic
The intensity and density of field are also maximum；The loosely coupled transformer T1Secondary side and primary side be symmetrical structure, i.e., it is described humorous
Shake compensating electric capacity C1Value and resonance compensation capacitor C2Value it is identical, primary inductor L1With secondary inductance L2Value it is identical, make described
Loosely coupled transformer T1Secondary side be also at resonant state；
The rectification and filter circuit are by diode D1, diode D2, diode D3, diode D4With filter capacitor CoIt constitutes,
Wherein, diode D1Cathode and diode D2Cathode jointly with filter capacitor CoOne end be connected, diode D3Anode
With diode D4Anode and filter capacitor CoThe other end be connected, and be connected to the output low-pressure side；Diode D1Anode
With diode D3Cathode be connected to a input terminal, diode D2Anode and diode D4Cathode be connected to b input terminal.
3. the resonance high-gain DC-DC device according to claim 2 based on loosely coupled transformer, it is characterized in that: using
The control mode of primary side control or secondary side control, for controlling the voltage swing of load end；The primary side control refers to
The size of output voltage is adjusted by the method for primary side phase shift, i.e. the phase shifting angle of control primary side high-frequency inversion realizes output electricity
Voltage-controlled system；The secondary side control refers to by the diode D3And D4Both ends correspond paralleling switch pipe Q5And Q6,
Utilize switching tube Q5And Q6The time of on-off controls output voltage simultaneously.
4. the resonance high-gain DC-DC device according to claim 1 or 2 based on loosely coupled transformer, it is characterized in that: In
Dielectric (3) are added between the primary side (1) of loosely coupled transformer and secondary side (2), solve the Insulation Problems of transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920679979.8U CN209676129U (en) | 2019-05-10 | 2019-05-10 | A kind of resonance high-gain DC-DC device based on loosely coupled transformer |
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| CN201920679979.8U CN209676129U (en) | 2019-05-10 | 2019-05-10 | A kind of resonance high-gain DC-DC device based on loosely coupled transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962625A (en) * | 2019-05-10 | 2019-07-02 | 安徽水利水电职业技术学院 | A kind of resonance high-gain DC-DC device based on loosely coupled transformer |
| CN114244147A (en) * | 2021-12-17 | 2022-03-25 | 四川大学 | Electromagnetic field coupling generation device and method for electromagnetic strengthening treatment |
-
2019
- 2019-05-10 CN CN201920679979.8U patent/CN209676129U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962625A (en) * | 2019-05-10 | 2019-07-02 | 安徽水利水电职业技术学院 | A kind of resonance high-gain DC-DC device based on loosely coupled transformer |
| CN114244147A (en) * | 2021-12-17 | 2022-03-25 | 四川大学 | Electromagnetic field coupling generation device and method for electromagnetic strengthening treatment |
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