CN208174543U - A kind of high-gain Zero Voltage Converter circuit - Google Patents
A kind of high-gain Zero Voltage Converter circuit Download PDFInfo
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- CN208174543U CN208174543U CN201820841018.8U CN201820841018U CN208174543U CN 208174543 U CN208174543 U CN 208174543U CN 201820841018 U CN201820841018 U CN 201820841018U CN 208174543 U CN208174543 U CN 208174543U
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Abstract
The utility model discloses a kind of high-gain Zero Voltage Converter circuits, including non-isolation type high-gain DC-direct current DC-DC conversion circuit；The Zero voltage transition circuit being connect with non-isolation type high-gain DC-DC conversion circuit；Zero voltage transition circuit, when for the controllable switch conducting in non-isolation type high-gain DC-DC conversion circuit and turning off, it is zero by the operating voltage control between the first end and second end of controllable switch, it is also used to before the second diode shutdown in non-isolation type high-gain DC-DC conversion circuit, the operating current between the anode and cathode of the second diode is reduced to zero.The voltage between its both ends can be reduced to zero when controllable switch is connected, make the voltage zero at its both ends in controllable switch shutdown, it can also realize the zero-current switching of the second diode, reduce the switching loss of controllable switch and the second diode, reduce switching loss, extends service life.
Description
Technical field
The utility model relates to DC voltage booster circuit fields, more particularly to a kind of high-gain Zero Voltage Converter circuit.
Background technique
In recent years, renewable energy and new energy technology high speed development, the new energy skill such as wind-power electricity generation and photovoltaic power generation
Art has been increasingly becoming research hotspot.But since the voltage of new energy technology output is low, fluctuation is big, it is therefore desirable in new energy
DC-DC (Direct Current, the DC-DC) converter for increasing high-gain in the system of source is just able to satisfy the need of power supply unit
It asks.
In the prior art, non-isolation type high-gain DC-DC conversion circuit can be by storage capacitor and energy storage inductor
It is charged and discharged and realizes boosting, referring to FIG. 2, Fig. 2 is a kind of non-isolation type high-gain DC-DC conversion circuit in the prior art
Figure, including direct-current input power supplying V1, first diode D1, the second diode D2, energy storage inductor L1, resonant inductance Lr, storage capacitor
C1, polar capacitor C0, controllable switch Q and pure resistor load R, wherein V1Anode and D1Anode and L1First end connection,
D1Cathode and LrFirst end connection, LrSecond end and D2Anode and C1First end connection, C1Second end and L1's
Second end and the connection of the first end of Q, D2Cathode and C0Anode and R first end connection, C0Cathode and R second end, Q
Second end and V1Cathode connection.Control switch is come using PWM (Pulse Width Modulation, pulsewidth modulation) mode
When the turn-on and turn-off of Q can be such that Q is connected, V1To C1And L1Carry out charged in parallel；When Q is turned off, V1、L1、C1Series connection discharges to R,
To realize output boosting.
It is existing, non-isolation type high-gain DC-DC conversion circuit in application process, because of circuit structure and switching frequency
The reasons such as height, controllable switch Q therein and the second diode D2Loss it is more serious, service life is shorter.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
Utility model content
The purpose of the utility model is to provide a kind of high-gain Zero Voltage Converter circuits, reduce controllable switch and
The loss of two diodes, extends service life.
In order to solve the above technical problems, the utility model provides a kind of high-gain Zero Voltage Converter circuit, including：
Non-isolation type high-gain DC-direct current DC-DC conversion circuit；
The Zero voltage transition circuit being connect with the non-isolation type high-gain DC-DC conversion circuit；
The Zero voltage transition circuit, for the controllable switch in the non-isolation type high-gain DC-DC conversion circuit
When conducting and shutdown, it is zero by the operating voltage control between the first end and second end of the controllable switch, is also used in institute
State in non-isolation type high-gain DC-DC conversion circuit the second diode shutdown before, by the anode of second diode with
Operating current between cathode is reduced to zero.
Preferably, the Zero voltage transition circuit includes：
Auxiliary capacitor, auxiliary induction, third diode and auxiliary controllable switch；
The first end of the auxiliary capacitor is connect with the first end of the auxiliary induction, the auxiliary induction and the auxiliary
The common end of capacitor is connect with the first end of the controllable switch, the second end of the auxiliary induction and the third diode
The first end connection of anode and the auxiliary controllable switch, the sun of the cathode of the third diode and second diode
Pole connection, the second end of the auxiliary capacitor are connect with the second end for assisting controllable switch, the auxiliary capacitor and described
The common end of auxiliary controllable switch is connect with the second end of the controllable switch.
Preferably, the controllable switch is NMOS tube, then the first end of controllable switch is the drain electrode of NMOS tube, controllable switch
Second end be NMOS tube source electrode.
Preferably, the third diode is fast recovery diode FRD.
Preferably, the polar capacitor in the non-isolation type high-gain DC-DC conversion circuit is electrolytic capacitor.
Preferably, the auxiliary controllable switch is NMOS tube, then the first end of the auxiliary controllable switch is NMOS tube
The second end of drain electrode, the auxiliary controllable switch is the source electrode of NMOS tube.
The utility model provides a kind of high-gain Zero Voltage Converter circuit, including：Non-isolation type high-gain DC-is straight
Flow DC-DC conversion circuit；The Zero voltage transition circuit being connect with non-isolation type high-gain DC-DC conversion circuit；Zero voltage transition
Circuit, when for controllable switch conducting and shutdown in non-isolation type high-gain DC-DC conversion circuit, by the of controllable switch
Operating voltage control between one end and second end is zero, the be also used in non-isolation type high-gain DC-DC conversion circuit
Before the shutdown of two diodes, the operating current between the anode and cathode of the second diode is reduced to zero.
As it can be seen that the non-isolation type high-gain DC-DC conversion circuit of the utility model and with non-isolation type high-gain DC-DC
In the Zero voltage transition circuit that conversion circuit is connected, Zero voltage transition circuit can be converted in non-isolation type high-gain DC-DC
When controllable switch in circuit is connected, the operating voltage between the first end and second end of controllable switch is reduced to zero, opens damage
Consumption is approximately zero, compared to current scheme, reduces the turn-on consumption of controllable switch, can be made when controllable switch turns off controllable
The voltage of switch ends is zero, and turn-off power loss is approximately zero, reduces the turn-off power loss of controllable switch, additionally it is possible in non-isolation type
Before the second diode shutdown in high-gain DC-DC conversion circuit, by the work between the anode and cathode of the second diode
Electric current is slowly reduced to zero, and turn-off power loss is approximately zero, while reducing the switching loss of controllable switch and the second diode,
Extend service life.
Detailed description of the invention
It, below will be to the prior art and embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of high-gain Zero Voltage Converter circuit provided by the utility model；
Fig. 2 is a kind of non-isolation type high-gain DC-DC conversion circuit figure in the prior art；
Fig. 3 is a kind of circuit diagram of high-gain Zero Voltage Converter circuit provided by the utility model；
Fig. 4 is a kind of corresponding timing waveform of high-gain Zero Voltage Converter circuit provided by the utility model.
Specific embodiment
The core of the utility model is to provide a kind of high-gain Zero Voltage Converter circuit, reduces controllable switch and
The loss of two diodes, extends service life.
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Referring to FIG. 1, Fig. 1 is a kind of structural representation of high-gain Zero Voltage Converter circuit provided by the utility model
Figure, including：
Non-isolation type high-gain DC-direct current DC-DC conversion circuit；
The Zero voltage transition circuit 2 being connect with non-isolation type high-gain DC-DC conversion circuit 1；
Zero voltage transition circuit 2, in non-isolation type high-gain DC-DC conversion circuit 1 controllable switch conducting and
When shutdown, it is zero by the operating voltage control between the first end and second end of controllable switch, is also used to increase in non-isolation type height
Before the second diode shutdown in beneficial DC-DC conversion circuit 1, by the operating current between the anode and cathode of the second diode
It is reduced to zero.
In view of in non-isolation type high-gain DC-DC conversion circuit 1 in the prior art, controllable switch Q and the two or two
Pole pipe D2During turn-on and turn-off under the conditions of hard switching, when hard switching condition is specially opened, switching device
Electric current rises and voltage declines while carrying out；When shutdown, voltage rises and electric current declines while carrying out.Voltage, current waveform
Overlapping to produce switching loss, which rapidly increases with the raising of switching frequency.Simultaneously because the switch frequency of controllable switch Q
Rate will cause higher switching loss at least up to 100kHZ, reduce the use of controllable switch and the second diode
Service life, while under the operating condition of hard switching, switching noise is larger, influences working environment, and electromagnetic interference can than more serious,
Influence the work of ambient electronics.Zero voltage transition circuit 2 in the utility model embodiment can be connected in controllable switch
When, the voltage at its both ends is reduced to zero, it is connected under zero voltage condition, turn-on consumption is approximately zero, can controllably opened
When closing, the voltage for controlling its both ends is zero, realizes zero voltage turn-off, and turn-off power loss is approximately zero, and can also
Control the second diode when off, the electric current at both ends is slowly reduced to zero, and turn-off power loss is approximately zero, extends and controllably opens
The service life of pass and the second diode.
Specifically, the type of the Zero voltage transition circuit 2 in the utility model embodiment can there are many, the utility model
Embodiment is it is not limited here.
Wherein, while solving above-mentioned technical problem, in the Zero voltage transition circuit 2 in the utility model embodiment
The short then switching loss of the turn-on time of device is smaller, not will increase loss so that extraly increasing cost.
The utility model provides a kind of high-gain Zero Voltage Converter circuit, including：Non-isolation type high-gain DC-is straight
Flow DC-DC conversion circuit；The Zero voltage transition circuit being connect with non-isolation type high-gain DC-DC conversion circuit；Zero voltage transition
Circuit, when for controllable switch conducting and shutdown in non-isolation type high-gain DC-DC conversion circuit, by the of controllable switch
Operating voltage control between one end and second end is zero, the be also used in non-isolation type high-gain DC-DC conversion circuit
Before the shutdown of two diodes, the operating current between the anode and cathode of the second diode is reduced to zero.
As it can be seen that the non-isolation type high-gain DC-DC conversion circuit of the utility model and with non-isolation type high-gain DC-DC
In the Zero voltage transition circuit that conversion circuit is connected, Zero voltage transition circuit can be converted in non-isolation type high-gain DC-DC
It is zero by the operating voltage control between the first end and second end of controllable switch when controllable switch in circuit is connected, it is open-minded
Loss is approximately zero, compared to current scheme, reduces the turn-on consumption of controllable switch, and can make when controllable switch turns off can
The voltage for controlling switch ends is zero, and turn-off power loss is approximately zero, reduces the turn-off power loss of controllable switch, additionally it is possible to non-isolated
Before the second diode shutdown in type high-gain DC-DC conversion circuit, by the work between the anode and cathode of the second diode
Make electric current and be slowly reduced to zero, turn-off power loss is approximately zero, while reducing the switch damage of controllable switch and the second diode
Consumption, extends service life.
On the basis of the above embodiments：
Embodiment as one preferred, Zero voltage transition circuit 2 include：
Auxiliary capacitor, auxiliary induction, third diode and auxiliary controllable switch；
The first end of auxiliary capacitor and the first end of auxiliary induction connect, the common end of auxiliary induction and auxiliary capacitor with can
The first end connection of control switch, the second end of auxiliary induction and the anode of third diode and the first end for assisting controllable switch
Connection, the cathode of third diode are connect with the anode of the second diode, second end and the auxiliary controllable switch of auxiliary capacitor
The second end of second end connection, the common end and controllable switch of auxiliary capacitor and auxiliary controllable switch connects.
In order to be preferably illustrated to the utility model embodiment, referring to FIG. 3, Fig. 3 is provided by the utility model
A kind of circuit diagram of high-gain Zero Voltage Converter circuit, it should be noted that remove change-over switch Q and auxiliary switch Q1Except institute
The first end and second end for the electronic device being related to is only the connection relationship being convenient between outlines device, not limits its connection
Port, that is to say, that use can be converted for two connectivity ports.
Wherein, the utility model embodiment is on the basis of the loss of reduction controllable switch above-mentioned and the second diode
On, since the resonant process of auxiliary capacitor and auxiliary induction limits voltage and current of the controllable switch in switching process
Change rate reduces switching noise, optimizes working environment.
Specifically, the type of controllable switch Q can there are many kinds of, such as can for it is various include parasitic body diode
Controlled tr tube, such as NMOS (N-Metal-Oxide-Semiconductor, N-type Metal-oxide-semicondutor) pipe etc.,
The utility model embodiment is it is not limited here.
Specifically, first diode, the second diode and third diode can be a plurality of types of diodes, such as Xiao
The diode of special based diode or the other kinds of purpose of utility model that can not influence the utility model, the utility model
Embodiment is it is not limited here.
Embodiment as one preferred, controllable switch are NMOS tube, then the first end of controllable switch is the leakage of NMOS tube
Pole, the second end of controllable switch are the source electrode of NMOS tube.
Specifically, NMOS tube have it is small in size, light-weight, the service life is long, noise is low, thermal stability is good, strong antijamming capability,
The advantages that low in energy consumption and easy to control.
Certainly, other than NMOS tube, controllable switch can also be other kinds of controllably opening comprising parasitic body diode
Guan Guan, the utility model embodiment is it is not limited here.
Embodiment as one preferred, third diode are FRD (Fast recovery diode, fast two pole of quick-recovery
Pipe).
Specifically, FRD has many advantages, such as that switching characteristic is good and reverse recovery time is short.
Certainly, other than FRD, third diode can also be other kinds of diode, and the utility model embodiment exists
This is without limitation.
Embodiment as one preferred, the polar capacitor in non-isolation type high-gain DC-DC conversion circuit 1 are electrolysis electricity
Hold.
Specifically, electrolytic capacitor has many advantages, such as that capacitance is big and cheap.
Certainly, other than electrolytic capacitor, polar capacitor can also be other types, and the utility model embodiment is not done herein
It limits.
Embodiment as one preferred, auxiliary controllable switch are NMOS tube, then assist the first end of controllable switch to be
The drain electrode of NMOS tube assists the second end of controllable switch for the source electrode of NMOS tube.
Specifically, NMOS tube have it is small in size, light-weight, the service life is long, noise is low, thermal stability is good, strong antijamming capability,
The advantages that low in energy consumption and easy to control.
Certainly, other than NMOS tube, auxiliary controllable switch can also be other kinds of controlled tr tube, the utility model
Embodiment is it is not limited here.
Embodiment as one preferred, the frequency of the driving pulse of the driving pulse and auxiliary controllable switch of controllable switch
It is identical.
Specifically, the driving pulse of controllable switch is with auxiliary, the frequency of driving pulse of controllable switch is identical can to control
The design of circuit processed is more convenient.
Embodiment as one preferred, the duty ratio of the driving pulse of controllable switch are the driving arteries and veins for assisting controllable switch
N times of the duty ratio of punching, wherein N is the positive number greater than 1.
Specifically, the duty ratio of the driving pulse of controllable switch is the N for assisting the duty ratio of driving pulse of controllable switch
Times, wherein N is the positive number greater than 1, and the conduction loss of each device in Zero voltage transition circuit 2 can be made smaller.
Wherein, N can be the positive number greater than 1, such as 1,1.5 or 3 etc., and the utility model embodiment does not limit herein
It is fixed.
Specifically, in practical applications, converter circuit is referred to following parameter and is designed：
For non-isolation type high-gain DC-DC conversion circuit 1, input power V1=15v；Resonant inductance Lr=0.3uH；Storage
It can capacitor C1=4.7uF；Energy storage inductor L1=50uH；Polar capacitor C0=100uF；Pure resistor load R=45 Ω；Controllable switch Q
For NMOS, switching frequency fs=100kHZ, duty ratio d=0.6.For Zero voltage transition circuit 2, auxiliary capacitor Cr=10nF；
Auxiliary induction Lr1=5uF；Assist controllable switch Q1For N-channel MOS FET, switching frequency fs=100kHZ, duty ratio d=0.1.
Certainly, other than above-mentioned parameter, each device in converter circuit is also designed to other parameters, this
Utility model embodiment is it is not limited here.
Technical solution provided by the utility model embodiment for ease of understanding, it is practical to this below with reference to Fig. 3 and Fig. 4
Conversion circuit provided by new embodiment is illustrated.
It should be noted that for the ease of analysis, for circuit shown in Fig. 3, it is assumed that all elements all in perfect condition,
The conduction voltage drop for ignoring switching tube ignores drain current when diode, switching tube cut-off, ignores the series resistance of capacitor,
Flow through L1Electric current it is continuous, C0Output voltage on enough ambassador's load resistance R is constant.
As shown in figure 4, wherein t0-t7It is the waveform situation of change in a complete cycle, mainly works below this seven
State is analyzed.(it is located at t0Before, topological original state is：Q,Q1All in off state, V1-L1-C1-D2- R series connection
It powers to R and constitutes boosting circuit, the electric current for flowing through the circuit is iD2。)
(1)t0-t1Period
In t0Moment, pulse signal Vgs1Drive Q1Make its zero current passing.To be formed into a loop V1-L1-Lr1-Q1, at this time
Flow through circuit V1-L1-Lr1-Q1Electric current ir1It linearly increases, flows through circuit V1-L1-C1-D2The electric current i of-RD2Linear decline,
In t1Moment, electric current ir1Value be equal to electric current iD2In t0The value at moment, and electric current iD2In t1Moment is reduced to zero, D2Cut-off realizes zero
Switch off current.
(2)t1-t2Period
Q1Continue to be held on, at this time CrAnd Lr1Parallel connection forms a resonant tank Cr-Lr1-Q1, CrTo Lr1Charging, flows through
Lr1Electric current ir1Increase and C in sinerOn voltage reduce, in t2Moment, CrOn voltage when being reduced to zero, Lr1Electric current ir1
Reach maximum value.Because of Q and CrParallel connection, so in t2Moment, the voltage v at the both ends QQIt also is zero.
(3)t2-t3Period
In this period, Q1Continue to be connected, ir1It is maintained at maximum value, the body diode conducting of Q makes the voltage v at the both ends QQStill
Holding is also zero.
(4)t3-t4Period
In t3At the moment, Q is in pulse signal VgsUnder the action of be connected, Q1Shutdown.Due to Q before conducting both end voltage vQ?
Through being reduced to zero, so Q realizes no-voltage conducting, the realization of no-voltage conducting reduces switching loss, drop compared with prior art
Low switch noise.Meanwhile V1Start respectively to C1And L1Charging, forms two circuit V1-D1-Lr-C1- Q and V1-L1-Q.Due to Lr
And C1Series resonance is constituted, therefore flows through D1Electric current iD1In sinusoidal variations, L1On il1Electric current linearly rises.V at this time1Still
So keep to C1And L1Charging.Due to Q1Shutdown, DrConducting, Lr1To C1Charging is formed into a loop Lr1-Dr-C1, Lr1On electric current ir1
Linearly reduce since maximum value, in t4Moment, Lr1On electric current ir1It is reduced to zero, DrRealize zero-current switching.
(5)t4-t5Period
In V1-D1-Lr-C1In Q resonance circuit, V1Continue to C1It is charged to t5Moment electric current iD1It is reduced to zero, D1Zero current closes
It is disconnected, C1Charging terminates, C1Upper voltage reaches maximum value.And V1-L1The circuit-Q, V1It keeps to L1Charging, L1On iL1Electric current is still
It is linear to increase.
(6)t5-t6Period
In this period, only V1-L1The circuit-Q, L1It is electrically charged until t6Moment, Q cut-off, L1Charging terminates.L1Upper electric current reaches
To maximum value.
(7)t6-t7Period
Q and Q1All end, V1-L1-CrCircuit is constituted to CrCharging makes Q both end voltage slowly rise realization zero voltage turn-off,
t7Moment both end voltage reaches；V simultaneously1-L1-C1-D2- R constitutes circuit and discharges to obtain compared with high output voltage to R.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.It should also be noted that, in this theory
In bright book, relational terms such as first and second and the like be used merely to by an entity or operation with another entity or
Operation distinguishes, without necessarily requiring or implying between these entities or operation there are any this actual relationship or
Sequentially.Moreover, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that
Process, method, article or equipment including a series of elements not only includes those elements, but also including being not explicitly listed
Other element, or further include for elements inherent to such a process, method, article, or device.Do not limiting more
In the case where system, the element that is limited by sentence "including a ...", it is not excluded that including process, method, the object of the element
There is also other identical elements in product or equipment.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (6)
1. a kind of high-gain Zero Voltage Converter circuit, which is characterized in that including：
Non-isolation type high-gain DC-direct current DC-DC conversion circuit；
The Zero voltage transition circuit being connect with the non-isolation type high-gain DC-DC conversion circuit；
The Zero voltage transition circuit, for the controllable switch conducting in the non-isolation type high-gain DC-DC conversion circuit
And when shutdown, it is zero by the operating voltage control between the first end and second end of the controllable switch, is also used to described non-
Before the second diode shutdown in isolated form high-gain DC-DC conversion circuit, by the anode and cathode of second diode
Between operating current be reduced to zero.
2. converter circuit according to claim 1, which is characterized in that the Zero voltage transition circuit includes：
Auxiliary capacitor, auxiliary induction, third diode and auxiliary controllable switch；
The first end of the auxiliary capacitor is connect with the first end of the auxiliary induction, the auxiliary induction and the auxiliary capacitor
Common end connect with the first end of the controllable switch, the anode of the second end of the auxiliary induction and the third diode
And the first end connection of the auxiliary controllable switch, the anode company of the cathode of the third diode and second diode
It connects, the second end of the auxiliary capacitor is connect with the second end of the auxiliary controllable switch, the auxiliary capacitor and the auxiliary
The common end of controllable switch is connect with the second end of the controllable switch.
3. converter circuit according to claim 2, which is characterized in that the controllable switch is NMOS tube, then controllably opens
The first end of pass is the drain electrode of NMOS tube, and the second end of controllable switch is the source electrode of NMOS tube.
4. converter circuit according to claim 3, which is characterized in that the third diode is fast recovery diode
FRD。
5. converter circuit according to claim 4, which is characterized in that the non-isolation type high-gain DC-DC conversion electricity
Polar capacitor in road is electrolytic capacitor.
6. according to the described in any item converter circuits of claim 2-5, which is characterized in that the auxiliary controllable switch is NMOS
Pipe, then the first end of the auxiliary controllable switch is the drain electrode of NMOS tube, and the second end of the auxiliary controllable switch is NMOS tube
Source electrode.
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| CN201820841018.8U CN208174543U (en) | 2018-05-31 | 2018-05-31 | A kind of high-gain Zero Voltage Converter circuit |
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| CN201820841018.8U CN208174543U (en) | 2018-05-31 | 2018-05-31 | A kind of high-gain Zero Voltage Converter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768165A (en) * | 2018-05-31 | 2018-11-06 | 广东工业大学 | A kind of high-gain Zero Voltage Converter circuit |
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| CN108768165A (en) * | 2018-05-31 | 2018-11-06 | 广东工业大学 | A kind of high-gain Zero Voltage Converter circuit |
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Granted publication date: 20181130 Termination date: 20200531 |