CN109391129A - Active-clamp transformation system - Google Patents
Active-clamp transformation system Download PDFInfo
- Publication number
- CN109391129A CN109391129A CN201811114662.6A CN201811114662A CN109391129A CN 109391129 A CN109391129 A CN 109391129A CN 201811114662 A CN201811114662 A CN 201811114662A CN 109391129 A CN109391129 A CN 109391129A
- Authority
- CN
- China
- Prior art keywords
- switch element
- electric current
- active
- main switch
- clamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02M1/00—Details of apparatus for conversion
-
- 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
-
- 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
This application discloses a kind of active-clamp transformation system, which includes: active-clamp translation circuit, detection circuit and control circuit, and active-clamp translation circuit includes the resonant inductance, transformer and main switch element being sequentially connected in series；The test side of detection circuit connects active-clamp translation circuit, for detecting the electric current by resonant inductance；The input terminal of control circuit is connected to detection circuit and the control terminal of its first output end and main switch element connects, the electric current of resonant inductance for receiving test circuit output, and when electric current meets the first predetermined current condition, main switch element conducting is controlled, so that main switch element no-voltage is open-minded；Wherein, the first predetermined current condition is electric current in the first preset range.By the above-mentioned means, the application can make active-clamp translation circuit easily controllable.
Description
Technical field
This application involves electronic technology fields, more particularly to a kind of active-clamp transformation system.
Background technique
Active-clamp translation circuit is due to succinct, input and output electrical isolation, voltage lifting/lowering range with circuit topology
Width is easy to the advantages that multiple-channel output, thus is widely used in middle low power transformation occasion.
Charger on current market mostly uses greatly forward topology or flyback topologies to realize, existing active clamp forward
Control difficulty in topology or active-clamp flyback topologies is big.
Summary of the invention
The application can be such that active-clamp converts mainly solving the technical problems that provide a kind of active-clamp transformation system
Circuit is easily controllable.
In order to solve the above technical problems, the technical solution that the application uses is: providing a kind of active-clamp transformation series
System, which includes: active-clamp translation circuit, detection circuit and control circuit, and active-clamp translation circuit includes
Resonant inductance, transformer and the main switch element being sequentially connected in series；The test side connection active-clamp transformation of detection circuit
Circuit, for detecting the electric current by resonant inductance；The input terminal of control circuit is connected to detection circuit and its first output end
It is connect with the control terminal of main switch element, the electric current of the resonant inductance for receiving test circuit output, and meet the in electric current
When one predetermined current condition, control main switch element conducting, so that main switch element no-voltage is open-minded；Wherein, the first default electricity
Stream condition is electric current in the first preset range.
The beneficial effect of the application is: being in contrast to the prior art, due to the active-clamp transformation system of the application
Including active-clamp translation circuit, detection circuit and control circuit, active-clamp translation circuit includes being sequentially connected in series
Resonant inductance, transformer and main switch element；The test side of detection circuit connects active-clamp translation circuit, logical for detecting
Cross the electric current of resonant inductance；The input terminal of control circuit is connected to the control of detection circuit and its first output end and main switch element
End connection processed, the electric current of the resonant inductance for receiving test circuit output, and when electric current meets the first predetermined current condition,
Main switch element conducting is controlled, so that main switch element no-voltage is open-minded；Wherein, the first predetermined current condition is electric current first
In preset range.Due to can by detect resonant inductance electric current, and the electric current meet the first predetermined current condition when, control
The conducting of main switch element processed enables active-clamp transformation system to control main switch element according to the current value on resonant inductance
Conducting, to keep active-clamp translation circuit easily controllable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the application first embodiment active-clamp transformation system；
Fig. 2 is the structural schematic diagram of the application second embodiment active-clamp transformation system；
Fig. 3 is the structural schematic diagram of the application 3rd embodiment active-clamp transformation system；
Each signal waveforms when Fig. 4 is the work of the embodiment of the present application active-clamp translation circuit.
Specific embodiment
It is understandable to enable the above objects, features, and advantages of the application to become apparent, with reference to the accompanying drawing, to the application
Specific embodiment be described in detail.It is understood that specific embodiment described herein is only used for explaining this Shen
Please, rather than the restriction to the application.It also should be noted that illustrating only for ease of description, in attached drawing and the application
Relevant part rather than entire infrastructure.Based on the embodiment in the application, those of ordinary skill in the art are not making creation
Property labour under the premise of all other embodiment obtained, shall fall in the protection scope of this application.
Term " first ", " second " in the application etc. be for distinguishing different objects, rather than it is specific suitable for describing
Sequence.In addition, term " includes " and " having " and their any deformations, it is intended that cover and non-exclusive include.Such as comprising
The process, method, system, product or equipment of a series of steps or units are not limited to listed step or unit, and
It is optionally further comprising the step of not listing or unit, or optionally further comprising for these process, methods, product or equipment
Intrinsic other step or units.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the application.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Referring to Fig. 1, Fig. 1 is the structural schematic diagram of the application first embodiment active-clamp transformation system.
Active-clamp transformation system 10 includes active-clamp translation circuit 11, detection circuit 12 and control circuit 13.
Active-clamp translation circuit 11 can be active clamp forward translation circuit or active-clamp inverse-excitation converting circuit.
In the present embodiment, active-clamp translation circuit 11 is active-clamp inverse-excitation converting circuit.Active clamping forward excitation converting circuit and
The difference of active-clamp inverse-excitation converting circuit is: the transformer in active clamping forward excitation converting circuit only serves voltage of transformation biography
The effect of delivery of energy amount, and the transformer in active-clamp inverse-excitation converting circuit plays the role of voltage of transformation transmission energy incessantly,
The effect of energy storage inductor is also acted as simultaneously.
Active-clamp translation circuit 11 includes transformer and main switch element S1.
Wherein, transformer includes transformer primary winding and transformer secondary winding, and transformer primary winding can be equivalent
For the resonant inductance Lr and magnetizing inductance Lm being sequentially connected in series.
In a feasible embodiment, active-clamp translation circuit 11 includes sequentially connected voltage source, resonant inductance
Lr, magnetizing inductance Lm and main switch element S1.
Wherein, main switch element S1 can be PMOS transistor or NMOS transistor, in the present embodiment, main switch member
Part S1 is NMOS transistor.Active-clamp translation circuit 11 in the application further includes other electron component, is specifically detailed in down
Text description.
The test side of detection circuit 12 connects active-clamp translation circuit 11, for detecting the electricity for passing through resonant inductance Lr
Stream, optionally, the test side of detection circuit 12 can directly be connect with resonant inductance Lr, can also be with the two sides resonant inductance Lr
Branch connection.Optionally, detection circuit 12 can for current transformer, Hall current sensor, Lip river Koffsky coil or
Optical current transformer etc..In the present embodiment, detection circuit 12 is current transformer, selection of the application to detection circuit 12
It is not construed as limiting, as long as being able to detect that the electric current i by resonant inductance LrLr?.What detection circuit 12 was also used to will test
Electric current i on resonant inductance LrLrIt is transmitted to control circuit 13.In the present embodiment, setting passes through the electric current i of resonant inductance LrLr's
Positive direction (forward current) is main switch element S1 when having just turned off, and passes through the electric current i of resonant inductance Lr at this timeLrDirection,
Correspondingly, setting and pros are electric current i in the opposite directionLrOpposite direction (reverse current).In the electricity for passing through resonant inductance Lr
Flow iLrWhen for forward current, iLrValue be positive value, similarly, passing through the electric current i of resonant inductance LrLrWhen for reverse current, iLr
Value be negative value.
The input terminal of control circuit 13 is connected to the control of detection circuit 12 and its first output end and main switch element S1
End connection, the electric current i for the resonant inductance Lr that receiving test circuit 12 exportsLr, and in electric current iLrMeet the first predetermined current
When condition, control main switch element S1 conducting, so that main switch element S1 zero voltage switch (Zero Voltage Switch,
ZVS)。
Optionally, the first predetermined current condition is electric current iLrIn the first preset range.Wherein, the first predetermined current condition
For electric current iLrMore than or equal to default negative current magnitude and it is less than or equal to zero current value, control circuit 13 is used in electric current
iLrElectric current i is judged when being gradually increasedLrWhether first predetermined current condition is met.For example, the first preset range can for [- a,
0], wherein the value of-a can be chosen according to the actual situation, and-a should be greater than the electric current i on resonant inductance LrLrIt is being gradually increased and is leading
When the voltage at the both ends switch element S1 is exactly 0, pass through the current value-A of resonant inductance Lr at this time.For example,-a can be equal to-A+
The value range of δ, δ be (0, A], for example,-a can be obtained according to-A, such as-a can be-A/2,-A/3 or -2A/3 etc.
Deng.The application is not construed as limiting the first preset range, as long as-a is greater than the electric current i on resonant inductance LrLrIt is gradually increased and leads
When the voltage at the both ends switch element S1 is exactly 0, pass through the electric current i of resonant inductance Lr at this timeLrValue.In the embodiment of the present application
In, the value of-a can be 0, i.e. the first predetermined current condition is electric current iLValue be zero.The value of-a is closer to 0, then active-clamp
The working efficiency of translation circuit is higher.
In the present embodiment, only pass through the electric current i on detection resonant inductance LrLr, and in electric current iLrIt is default to meet first
When current condition, control main switch element S1 conducting enables active-clamp transformation system 10 according to the electricity on resonant inductance Lr
Flow iLrThe conducting for controlling main switch element S1, to keep active-clamp translation circuit 11 easily controllable.
In addition, in the electric current i for passing through resonant inductance LrLrOccur in the change procedure from negative current magnitude to zero current value, and
When the voltage at the both ends main switch element S1 starts to be equal to zero just, at this moment if conducting main switch element S1, so that it may realize
The zero voltage switch of main switch element S1.
It should be understood that due to the electric current i for passing through resonant inductance Lr at this timeLrIt is still reverse current, the reverse value of current is larger,
And since the electric current that the conducting of main switch element S1 can be forced through resonant inductance Lr is forward current, both current direction phases
Instead, generated magnetic direction is also on the contrary, two kinds of magnetic fields are cancelled out each other in transformer, to generate active-clamp translation circuit
The case where working efficiency is lower, that is, due in the electric current i by resonant inductance LrLrBecome the mistake of zero current value from negative current magnitude
Cheng Zhong, the working efficiency that current variation speeds comparatively fast generate active-clamp translation circuit are low.
In the embodiment of the present application, pass through the electric current i of resonant inductance Lr by limitingLrIn the first preset range, i.e. resonance
Electric current i on inductance LrLrRange be [- a, 0], as electric current iLrIn the first preset range, due on resonant inductance Lr at this time
Electric current iLrPace of change when positive current is changed to by negative current magnitude, compared to the electric current i on resonant inductance LrLrGradually increase
Pace of change when turning on main switch element S1 when greatly and the voltages at the both ends main switch element S1 have just been 0 is slow, therefore, can subtract
Magnetic loss in few transformer, improves the working efficiency of active-clamp translation circuit.
Referring to Fig. 2, Fig. 2 is the structural schematic diagram of the application second embodiment active-clamp transformation system.
Active-clamp transformation system 20 includes active-clamp translation circuit 21, detection circuit 22 and control circuit 23.?
Detection circuit 22 in the present embodiment can be identical as the detection circuit 12 in first embodiment.
The difference of active-clamp translation circuit in the present embodiment and the active-clamp translation circuit in first embodiment
Be: the active-clamp translation circuit 21 of the present embodiment further includes auxiliary switch element S2, auxiliary switch element S2 and transformer primary side
Winding or main switch element S1 are connected in parallel, and the control terminal of auxiliary switch element S2 is connect with the second output terminal of control circuit 23,
Control circuit 23 is also used to control the conducting of auxiliary switch element S2, and main switch element S1 and auxiliary switch element S2 are not led simultaneously
It is logical.Wherein, auxiliary switch element S2 can be PMOS transistor or NMOS transistor, in the present embodiment, auxiliary switch element S2
For NMOS transistor.
In the present embodiment, control circuit 23 is also used in electric current iLrWhen meeting the second predetermined current condition, auxiliary open is controlled
Element S2 conducting is closed, so that auxiliary switch element S2 no-voltage is connected；Wherein, the second predetermined current condition is electric current iLrIt is pre- second
If in range.Wherein, the second predetermined current condition is electric current iLrLess than or equal to default positive current values and it is more than or equal to
Zero current value, control circuit 23 are used in electric current iLrElectric current i is judged when being gradually reducedLrWhether second predetermined current condition is met.
Similarly, about electric current iLrIt is that setting forward or backwards is identical with first embodiment, details are not described herein again.
For example, the second preset range can be [0, b], wherein the value of b can be equal to 0.By will be on resonant inductance Lr
Electric current iLrIt is limited in [0, b], and in electric current iLrAuxiliary switch element S2 is connected when being gradually reduced, resonance electricity can be avoided passing through
Feel the electric current i of LrLrThe no-voltage opened auxiliary switch element S2 in negative value and can not achieve auxiliary switch element S2 is open-minded.
Referring to Fig. 3, Fig. 3 is the structural schematic diagram of the application 3rd embodiment active-clamp transformation system.
Active-clamp transformation system 30 includes active-clamp translation circuit 31, detection circuit 32 and control circuit 33.?
In the present embodiment, detection circuit 32 and control circuit 33 can be with 13 phases of detection circuit 12 and control circuit in first embodiment
Together.
The difference of active-clamp translation circuit in the present embodiment and the active-clamp translation circuit in second embodiment
Be: the active-clamp translation circuit 31 of the present embodiment further includes clamping capacitance CC, voltage source Vin, rectifier diode D1, knot electricity
Hold CrAnd output capacitance C0。
Clamping capacitance CCIt is connected in series with auxiliary switch element S2, and clamping capacitance CCIt is connected in parallel in auxiliary switch element S2
Resonant inductance Lr or main switch element S1.
In one embodiment, first end, the transformer primary winding of the anode connection transformer primary winding of voltage source Vin
Second end connection main switch element S1 first end, the second end of main switch element S1 connection voltage source cathode.Correspondingly,
The first end of the first end connection transformer primary winding of clamping capacitance Cc, the second end of clamping capacitance Cc connect auxiliary switch element
The first end of S2, auxiliary switch element S2 second end connect the second end of transformer primary winding.
In another embodiment, since transformer primary winding can be equivalent to the resonant inductance Lr being sequentially connected in series and excitation
Inductance Lm, therefore, first end, the second end of resonant inductance Lr of the anode connection resonant inductance Lr of voltage source Vin connect excitation
The first end of inductance Lm, the first end of the second end of magnetizing inductance Lm connection main switch element S1, main switch element S1 second
The cathode of end connection voltage source.Correspondingly, clamping capacitance CCFirst end downlink connection resonant inductance Lr first end, clamping capacitance
CCSecond end connect auxiliary switch element S2 first end, auxiliary switch element S2 second end connect magnetizing inductance Lm second end；
Junction capacity CrFirst end connection main switch element S1 first end, junction capacity CrSecond end connection main switch member
The second end of part S1；
The anode of the first end connection rectifier diode D1 of transformer secondary winding, the cathode connection of rectifier diode D1 are defeated
Capacitor C out0First end, output capacitance C0Second end connection transformer secondary winding second end, output capacitance C0Both ends
Also with load parallel connection.
Illustrate the working principle of the embodiment of the present application active-clamp translation circuit 31 below.
Incorporated by reference to each signal waveforms that Fig. 3~Fig. 4, Fig. 4 are when the embodiment of the present application active-clamp translation circuit works.
In this application, setting through the positive direction of the electric current of resonant inductance Lr is the first end of resonant inductance Lr to resonance
The direction of the second end of inductance Lr, the first end that the positive direction by the electric current of magnetizing inductance Lm is magnetizing inductance Lm to excitation electricity
The direction for feeling the second end of Lm, the second end that the positive direction by the electric current of clamping capacitance Cc is clamping capacitance Cc to clamping capacitance
The direction of the first end of Cc, the positive direction of the voltage at the both ends junction capacity Cr are one end of junction capacity Cr to the second end of junction capacity Cr
Direction, the positive direction of the voltage at transformer primary winding both ends be transformer primary winding first end to transformer primary side around
The direction of the second end of group.In addition, corresponding current value or electricity when the direction of sense of current perhaps voltage is opposite direction
Pressure value is indicated with negative value.
The working principle that the embodiment of the present application converts in order to illustrate active-clamp is not only with transformer primary winding
To illustrate, or illustrate only with resonant inductance Lr and magnetizing inductance Lm, but both synthesis use.It should be understood that transformation
Device primary side winding can be equivalent to the resonant inductance Lr and magnetizing inductance Lm being sequentially connected in series,
The working condition of active-clamp transformation system 30 particularly may be divided into seven stages.
In the present embodiment, the turn ratio n of transformer primary winding and transformer secondary winding is N:1, transformer primary side
Winding second end and transformer secondary winding first end are Same Name of Ends, and the inductance value of resonant inductance Lr is much smaller than magnetizing inductance Lm's
Inductance value, i.e. LLr<<LLm, wherein；For LLrFor the inductance value of Lr, LLmFor the inductance value of Lm.In addition, Lr energy storage is greater than CrEnergy storage.
First stage: t=t0~t1, at the t0 moment, control circuit 33 controls main switch element S1 conducting, auxiliary switch element
S2 is disconnected, and rectifier diode D1 bears backward voltage and ends, the also reverse bias of the parasitic diode in auxiliary switch element S2, the
Electric current i on one inductanceLr, electric current i on the second inductanceLmLinear rise under the action of voltage source Vin.
Second stage: t=t1~t2, at the t1 moment, control circuit 33 controls main switch element S1 and disconnects, auxiliary switch element
S2 continues to remain open, junction capacity CrWith resonant inductance Lr and magnetizing inductance Lm resonance, exciting current i is utilizedLmGive junction capacity Cr
Charging, exciting current iLmFor the electric current for flowing through magnetizing inductance Lm, junction capacity CrThe voltage at both ends gradually rises, auxiliary switch element S2
Interior parasitic diode remains unchanged reverse bias.
Phase III, t=t2~t3, at the t2 moment, junction capacity CrThe voltage at both ends is increased to Vin+Vcc, wherein Vin
For the output voltage of voltage source Vin；Vcc is clamping capacitance CCThe voltage in stable state, be worth for nV0, wherein n is transformer primary
Turn ratio while with pair, V0For output voltage, i.e. load voltage, at this point, the parasitic diode in auxiliary switch element S2 is connected,
Resonant inductance Lr, magnetizing inductance Lm are the same as clamping capacitance CCResonance is carried out, due to clamping capacitance CCCapacity be much larger than junction capacity Cr's
Capacity, therefore, the electric current on resonant inductance Lr and magnetizing inductance Lm at this time nearly all pass through the parasitism in auxiliary switch element S2
Diode flows to clamping capacitance CC, pass through the parasitism in auxiliary switch element S2 in the electric current on resonant inductance Lr and magnetizing inductance Lm
Diode flows to clamping capacitance CCWhile, the voltage of the Vpri of transformer primary winding is
Fourth stage, t=t3~t4, as the voltage V of transformer primary windingpriWhen dropping to minimum, rectifier diode D1
Forward conduction, the voltage V of transformer primary windingpriJust it has been clamped at nV0.At this moment, resonant inductance Lr and clamping capacitance CCIt is humorous
Vibration, while magnetizing inductance Lm gives junction capacity CrCharging.Due to magnetizing inductance Lm and clamping capacitance CCResonance, i.e. on magnetizing inductance Lm
Electric current iLmValue gradually decrease to 0 by positive value after to negative value.In active-clamp transformation system, in order to realize auxiliary switch element S2
Zero voltage switch, in the electric current i of resonant inductanceLrAuxiliary switch element S2 is connected before reversed.For example, detection circuit 32 can detecte
Pass through the electric current i on magnetizing inductance LmLm, and the electric current i that will testLmIt is transmitted to control circuit, control circuit is for passing through
Current value i on magnetizing inductance LmLmWhen being gradually reduced and meeting the second predetermined current condition, auxiliary switch element S2 is connected.About
The description of second preset condition please refers to above, and details are not described herein again.
5th stage, t=t4~t5, at the t4 moment, auxiliary switch element S2 shutdown, the clamping capacitance C madeCBy rapidly from
Circuit Interrupt is opened.Meanwhile resonant inductance Lr and junction capacity CrResonance, the voltage V of transformer primary windingpriStill be clamped at-
nV0In value.
6th stage, t=t5~t6, at the t5 moment, as junction capacity CrThe voltage at the both ends (or main switch element S1) is 0
When, i.e., in UCrWhen=0, the parasitic diode in main switch element S1 is connected, and the voltage on resonant inductance Lr is clamped at Vin+
nV0Value, at this point, the electric current i on resonant inductance LrLrThe rate of climb beThe then electricity in rectifier diode D1
Flow isecDecrease speed be
7th stage, t=t6~t7, as the electric current i on resonant inductance LrLrWhen meeting the first predetermined current condition, control
Circuit 33 controls main switch element S1 conducting, realizes that the no-voltage of main switch element S1 is open-minded.Electric current i on resonant inductance LrLr
Continue to rise, passes through the electric current i of rectifier diode D1secIt is gradually reduced, passes through the electric current i on resonant inductance Lr at the t7 momentLrDeng
In passing through the electric current i on magnetizing inductance LmLmWhen, pass through the electric current i of rectifier diode D1 at this timesecEqual to zero, rectifier diode D1
It is reverse-biased.Voltage value in transformer primary winding is by-nV0Become Vin, a charge cycle terminates.Active-clamp transformation system
It will continue to repeat the above steps, carry out next charge cycle.The description as described in the first predetermined current condition please refers to retouches above
It states, details are not described herein again.
It should be noted that if passing through the electric current i on resonant inductance LrLrThe first predetermined current condition and electric current are not met
iLrLess than the first preset range, when main switch element S1 is opened in control circuit control, due to resonant inductance Lr and junction capacity CrHair
It gives birth to resonance and resonant inductance Lr is made to generate reverse current, which generates the first magnetic field；And since main switch element S1 is led
It is logical so that voltage source Vin charges to resonant inductance Lr and resonant inductance Lr is promoted to generate forward current, which generates the
Two magnetic fields, the first magnetic field and the second magnetic field are offset each other due to contrary, to reduce the work of active-clamp transformation system
Make efficiency.
If passing through the electric current i on resonant inductance LrLrWhen in forward current, resonant inductance Lr will be again to junction capacity CrIt fills
Electricity, at this time junction capacity CrThe voltage U at both endsCrIt will become positive value, the no-voltage that can not achieve main switch element S1 is open-minded.
It is in contrast to the prior art, since the active-clamp transformation system of the application includes active-clamp transformation electricity
Road, detection circuit and control circuit, active-clamp translation circuit include the resonant inductance being sequentially connected in series, transformer and
Main switch element；The test side of detection circuit connects active-clamp translation circuit, for detecting the electric current by resonant inductance；Control
The input terminal of circuit processed is connected to detection circuit and the control terminal of its first output end and main switch element connects, for receiving inspection
The electric current of the resonant inductance of slowdown monitoring circuit output, and when electric current meets the first predetermined current condition, control main switch element conducting,
So that main switch element no-voltage is open-minded；Wherein, the first predetermined current condition is electric current in the first preset range.Due to can
By detecting the electric current of resonant inductance, and when the electric current meets the first predetermined current condition, the conducting of main switch element is controlled,
Enable active-clamp transformation system according to the conducting of the current value control main switch element on resonant inductance, to make active pincers
Bit map circuit is easily controllable.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the patents of the application, all to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content is applied directly or indirectly in other relevant
Technical field similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of active-clamp transformation system, which is characterized in that the transformation system includes:
Active-clamp translation circuit, including the resonant inductance, transformer and main switch element being sequentially connected in series；
Detection circuit, test side connect the active-clamp translation circuit, for detecting the electric current for passing through the resonant inductance；
Control circuit, input terminal are connected to the control terminal of the detection circuit and its first output end and the main switch element
Connection, the electric current of the resonant inductance for receiving the detection circuit output, and meet the first default electricity in the electric current
When stream condition, the main switch element conducting is controlled, so that main switch element no-voltage is open-minded；Wherein, the described first default electricity
Stream condition is the electric current in the first preset range.
2. transformation system according to claim 1, which is characterized in that the first predetermined current condition is that the electric current is big
In or equal to default negative current magnitude and it is less than or equal to zero current value, the control circuit in the electric current for gradually increasing
Judge whether the electric current meets the first predetermined current condition when big.
3. transformation system according to claim 1, which is characterized in that the active-clamp translation circuit further includes auxiliary switch
Element, the auxiliary switch element are connected in parallel with the resonant inductance or the main switch element, the control of the auxiliary switch element
End processed is connect with the second output terminal of the control circuit, and the control circuit is also used to control leading for the auxiliary switch element
It is logical, and the main switch element and the auxiliary switch element do not simultaneously turn on.
4. transformation system according to claim 1, which is characterized in that the control circuit is also used to meet in the electric current
When the second predetermined current condition, the auxiliary switch element conductive is controlled, so that auxiliary switch element no-voltage is open-minded；Wherein, described
Second predetermined current condition is the electric current in the second preset range.
5. transformation system according to claim 1, which is characterized in that the second predetermined current condition is that the electric current is small
In or equal to default positive current values and it is more than or equal to zero current value, the control circuit in the electric current for gradually subtracting
Hour judges whether the electric current meets the second predetermined current condition.
6. transformation system according to claim 3, which is characterized in that the active-clamp translation circuit further includes clamp electricity
Hold；The clamping capacitance and the auxiliary switch element are connected in series, and the clamping capacitance and the auxiliary switch element in parallel connect
It is connected to the resonant inductance or the main switch element.
7. transformation system according to claim 6, which is characterized in that the transformer include transformer primary winding and
Transformer secondary winding；The active-clamp translation circuit further includes voltage source, rectifier diode, junction capacity and output electricity
Hold；
The anode of the voltage source connects the first end of the transformer primary winding, the second end of the transformer primary winding
The second end of the first end, the main switch element that connect the main switch element connects the cathode of the voltage source；
The first end of the clamping capacitance connects the first end of the transformer primary winding, and the second end of the clamping capacitance connects
The first end of the auxiliary switch element is connect, the auxiliary switch element second end connects the second end of the transformer primary winding；
The first end of the junction capacity connects the first end of the main switch element, and the second end of the junction capacity connects the master
The second end of switch element；
The first end of the transformer secondary winding connects the anode of the rectifier diode, and the cathode of the rectifier diode connects
The first end of the output capacitance is connect, the second end of the output capacitance connects the second end of the transformer secondary winding, institute
State the both ends of output capacitance also with load parallel connection.
8. according to the described in any item transformation systems of claim 3~7, which is characterized in that the main switch element is PMOS brilliant
Body pipe or NMOS transistor；
The auxiliary switch element is PMOS transistor or NMOS transistor.
9. transformation system according to claim 1, which is characterized in that the active-clamp translation circuit is that active-clamp is anti-
Excitation converting circuit.
10. transformation system according to claim 1, which is characterized in that the detection circuit is current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114662.6A CN109391129B (en) | 2018-09-25 | 2018-09-25 | Active clamp switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811114662.6A CN109391129B (en) | 2018-09-25 | 2018-09-25 | Active clamp switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109391129A true CN109391129A (en) | 2019-02-26 |
| CN109391129B CN109391129B (en) | 2021-09-17 |
Family
ID=65417829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811114662.6A Active CN109391129B (en) | 2018-09-25 | 2018-09-25 | Active clamp switching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109391129B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064367A (en) * | 2019-08-26 | 2020-04-24 | 广州金升阳科技有限公司 | Control method of flyback converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070087304A (en) * | 2006-02-23 | 2007-08-28 | 엘지이노텍 주식회사 | Flyback converter |
| CN201430532Y (en) * | 2009-06-15 | 2010-03-24 | 浙江大学 | Zero voltage switch flyback type DC-DC power supply conversion device |
| CN102307017A (en) * | 2011-09-16 | 2012-01-04 | 浙江大学 | Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device |
| CN103956904A (en) * | 2014-05-14 | 2014-07-30 | 江苏斯达工业科技有限公司 | Fly-back electric power converter topological structure and control method thereof |
| CN105375768A (en) * | 2015-10-19 | 2016-03-02 | 成都芯源系统有限公司 | Capacitive mode protection method and capacitive mode control circuit of resonant converter |
| EP3151411A1 (en) * | 2015-10-02 | 2017-04-05 | VLT, Inc. | Clamped capacitor resonant power converter |
-
2018
- 2018-09-25 CN CN201811114662.6A patent/CN109391129B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070087304A (en) * | 2006-02-23 | 2007-08-28 | 엘지이노텍 주식회사 | Flyback converter |
| CN201430532Y (en) * | 2009-06-15 | 2010-03-24 | 浙江大学 | Zero voltage switch flyback type DC-DC power supply conversion device |
| CN102307017A (en) * | 2011-09-16 | 2012-01-04 | 浙江大学 | Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device |
| CN103956904A (en) * | 2014-05-14 | 2014-07-30 | 江苏斯达工业科技有限公司 | Fly-back electric power converter topological structure and control method thereof |
| EP3151411A1 (en) * | 2015-10-02 | 2017-04-05 | VLT, Inc. | Clamped capacitor resonant power converter |
| CN105375768A (en) * | 2015-10-19 | 2016-03-02 | 成都芯源系统有限公司 | Capacitive mode protection method and capacitive mode control circuit of resonant converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064367A (en) * | 2019-08-26 | 2020-04-24 | 广州金升阳科技有限公司 | Control method of flyback converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109391129B (en) | 2021-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205283422U (en) | A control module , switch converter, lighting system and estimator level for switch converter | |
| CN106505865B (en) | A kind of asymmetrical half-bridge flyback converter and its drive control method | |
| CN105429313B (en) | A kind of control method of the changeable radio energy transmission system of resonance compensation topology | |
| US10224825B2 (en) | Primary side feedback control for a resonant converter with a transformer model | |
| CN108237943B (en) | A kind of dual output port charging circuit and its control method | |
| CN108736727A (en) | Power supply changeover device and its control method | |
| CN105281576A (en) | Quasi-resonant half-bridge converter and control method thereof | |
| CN106849686A (en) | Bicyclic fixed-frequency control method based on BUCK LLC two-stage DC/DC converters | |
| CN106374749A (en) | Circuits and methods for synchronous rectification in resonant converters | |
| CN108964469A (en) | The double LLC resonant converters of a kind of and cascaded structure full-bridge | |
| CN103701305B (en) | A kind of circuit of synchronous rectification and implementation method | |
| CN102969898B (en) | Low-voltage wide-input three-level full-bridge converter and control method thereof | |
| CN102196632B (en) | LED driving device | |
| CN113067458A (en) | Current sampling circuit applied to bidirectional AC-DC converter | |
| CN208337415U (en) | The double LLC resonant converters of a kind of and cascaded structure full-bridge | |
| CN109391129A (en) | Active-clamp transformation system | |
| CN1945948B (en) | Synchronous rectifying circuit of power converter | |
| CN101651425A (en) | Synchronous rectification driving device | |
| CN112311106A (en) | Single-stage full-bridge constant-current constant-voltage wireless charging device and control method thereof | |
| CN108696133A (en) | control device and control method | |
| CN106160479A (en) | Two stage power translation circuit and method | |
| TW201840114A (en) | Power converter and control method thereof | |
| CN104578766B (en) | A kind of bridge type multi-electrical level Switching capacitors | |
| CN201328102Y (en) | Secondary-side control device of transformer | |
| CN102801321B (en) | High-efficiency wide voltage range bidirectional charging and discharging device control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |