CN109245543A - Half-bridge resonance DC-DC converter and its operating method - Google Patents
Half-bridge resonance DC-DC converter and its operating method Download PDFInfo
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- CN109245543A CN109245543A CN201811183707.5A CN201811183707A CN109245543A CN 109245543 A CN109245543 A CN 109245543A CN 201811183707 A CN201811183707 A CN 201811183707A CN 109245543 A CN109245543 A CN 109245543A
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- 238000011017 operating method Methods 0.000 title claims abstract description 18
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 230000007704 transition Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000005669 field effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000024241 parasitism Effects 0.000 description 1
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- 238000009738 saturating Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses half-bridge resonance DC-DC converter and its operating methods, it is related to power adapter technical field；Half-bridge resonance DC-DC converter includes isolating transformer, resonant inductance, first switch, second switch and resonant capacitance；Resonant inductance couples between direct-current input power supplying and the first end of primary side；First switch has first end, second end and control terminal, and wherein second end couples grounding point；Second switch has first end, second end and control terminal, and wherein the first end of second end coupling first switch, first end couple direct-current input power supplying and resonant inductance.Resonant capacitance couples between the first end of first switch and the second end of primary side；The present invention can reduce switch element cost, reduces conduction losses and increase efficiency and reduces circuit volume.
Description
Technical field
The invention belongs to power adapter technical fields, and in particular to half-bridge resonance DC-DC converter and its operation
Method.
Background technique
It is shown in Figure 1, it is the circuit diagram of the active clamper flyback power converter of the relevant technologies.It is active
Clamper flyback power converter receives direct-current input power supplying Vin, and converts direct-current input power supplying Vin as DC output power
Vout.Active clamper flyback power converter includes isolating transformer Tr, resonant inductance Lr, resonant capacitance Cr, main switch
Qm and auxiliary switch Qa.
Active clamper flyback power converter has transformer Tr, with primary side and primary side, wherein primary
The turn ratio of the coil of the coil and primary side of side is n1:n2.In addition, primary side has magnetizing inductance Lm.Resonant inductance Lr coupling
It connects between direct-current input power supplying Vin and one end (such as dotted end) of primary side.Wherein resonant inductance Lr system utilizes transformer Tr
Leakage inductance realized.
Main switch Qm is coupled between the other end (such as non-dotted end) and grounding point of primary side, and wherein main switch Qm system is saturating
Cross main control signal Sm switching control.Resonant capacitance Cr coupled in series auxiliary switch Qa, in direct-current input power supplying Vin and main switch
Active clamper branch is formed between Qm, therefore auxiliary switch Qa is also referred to as clamp switch, wherein auxiliary switch Qa system is through auxiliary
Help control signal Sa switching control.
When load operates for underloading, it can pass through auxiliary control signal Sa and turn off auxiliary switch Qa, and penetrate main control
Main switch Qm is connected in signal Sm, and active clamper flyback power converter is made to operate in flyback mode (flyback
mode).When load operates for heavily loaded (or non-underloading), it can pass through auxiliary control signal Sa and auxiliary switch Qa be connected, and thoroughly
Main control signal Sm shutdown main switch Qm is crossed, active clamper flyback power converter is made to operate in active clamper flyback
Mode (ACF mode).
The active clamper flyback power converter of the relevant technologies as shown in Figure 1 there are the problem of or defect based on open
It is larger to close the voltage that Qm is born, it is therefore necessary to select the switch element compared with high voltage (specification can not be dropped), so not only increase
Switch element cost, also because the conducting resistance (RDS (on)) of main switch Qm and auxiliary switch Qa is larger, so that improving conducting damage
It loses (conduction loss), and reduces efficiency.
Assuming that direct-current input power supplying Vin is 400 volts, DC output power Vout be 10 volts and turn ratio (n1:
It n2) is 10:1.When main switch Qm is connected in main control signal Sm, and auxiliary control signal Sa turns off auxiliary switch Qa, main switch
The voltage that Qm is born is zero, and the voltage value that the voltage that auxiliary switch Qa is born is direct-current input power supplying Vin subtracts resonance electricity
Hold the cross-pressure at the both ends Cr.
When main control signal Sm turns off main switch Qm, and auxiliary switch Qa is connected in auxiliary control signal Sa, due to transformation
Releasing for the leakage inductance (i.e. resonant inductance Lr) of device Tr can charge to resonant capacitance Cr, therefore the voltage that auxiliary switch Qa is born is
Zero, the voltage value that the voltage that main switch Qm is born is direct-current input power supplying Vin adds (i.e. 10 volts of DC output power Vout
It is special) the coil both ends cross-pressure that is converted to primary side through turn ratio (i.e. 10:1) is 100 volts, along with the leakage inductance of transformer Tr
Caused abrupt voltage wave (assuming that 50 volts), about 550 volts in total, must be then selected with main switch Qm compared with high voltage,
Such as 600~650 volts of switch element.
Furthermore since in the conducting of active clamper branch, the leakage inductance that resonant capacitance Cr plays the part of storage transformer Tr is (i.e. humorous
Vibration inductance Lr) role that is released energy with magnetizing inductance Lm, it is therefore necessary to the resonant capacitance Cr for selecting larger capacitance causes
The increase of circuit volume.
Summary of the invention
To solve the problems, such as because increasing cost caused by selecting compared with high voltage switch element and reducing efficiency；The present invention provides
Half-bridge resonance DC-DC converter and its operating method.
Half-bridge resonance DC-DC converter of the invention, to convert direct-current input power supplying as DC output power；
Half-bridge resonance DC-DC converter include isolating transformer, resonant inductance, first switch, second switch, resonant capacitance with
And control unit；Isolating transformer has primary side and primary side；Resonant inductance couples the of direct-current input power supplying and primary side
Between one end；First switch has first end, second end and control terminal, and wherein second end couples grounding point；Second switch tool
There are first end, second end and control terminal, wherein the first end of second end coupling first switch, first end couples direct current input electricity
Source and resonant inductance；Resonant capacitance couples between the first end of first switch and the second end of primary side；Control unit provides the
One control signal and second control signal, wherein first control signal controls first switch through the control terminal of first switch, the
Two control signals control second switch through the control terminal of second switch.
Preferably, having the first blank time, second control signal between first control signal and second control signal
There is the second blank time between first control signal；Wherein the second blank time is less than the first blank time.
Preferably, the first blank time system is first control signal by time point that high levle transition is low level to
Two control signals are the time point of high levle by low level transition；Second blank time system is that second control signal is turned by high levle
State be the time point of high levle at the time point of low level by low level transition to first control signal.
Preferably, starting to generate resonant operation when second switch conducting.
Preferably, the time of resonant operation is greater than the time of second switch conducting, and led less than or equal to second switch
The summation of logical time and the second blank time.
Preferably, the second blank time is the time of first switch zero voltage switching.
Preferably, half-bridge resonance DC-DC converter further includes output diode and output capacitance；Export two poles
Pipe couples between the first end and ungrounded output end of primary side；Output capacitance couple ungrounded output end and ground connection output end it
Between, wherein ground connection output end is the second end of primary side.
Preferably, half-bridge resonance DC-DC converter further includes output diode and output capacitance.Export two poles
Pipe couples between the second end of primary side and ground connection output end.Output capacitance couple ungrounded output end and ground connection output end it
Between, wherein ungrounded output end is the first end of primary side.
Another object of the present invention is to provide a kind of operating method of half-bridge resonance DC-DC converter, solve because
The problem of selecting compared with increase cost caused by high voltage switch element and reducing efficiency.
The operating method of half-bridge resonance DC-DC converter proposed by the invention, to convert direct-current input power supplying
For DC output power, the half-bridge resonance DC-DC converter includes first switch, second switch and control unit,
Operating method includes: that control unit provides first control signal control first switch and provides second control signal control second
Switch；Control unit provides the first blank time between first control signal and second control signal；And control unit provides
Second blank time is between second control signal and first control signal, wherein when the second blank time is less than the first blank
Between.
Preferably, the half-bridge resonance DC-DC converter further includes isolating transformer, resonant inductance, resonance electricity
Hold；Isolating transformer has primary side and primary side；Resonant inductance couples between direct-current input power supplying and the first end of primary side；
First switch has first end, second end and control terminal, and wherein second end couples grounding point；Second switch have first end,
Second end and control terminal, wherein the first end of second end coupling first switch, first end couple direct-current input power supplying and resonance
Inductance；Resonant capacitance couples between the first end of first switch and the second end of primary side；Control unit provides the first control letter
Number first switch is controlled through the control terminal of first switch, provides second control signal through the control terminal control the of second switch
Two switches.
Preferably, the first blank time system is first control signal by time point that high levle transition is low level to
Two control signals are the time point of high levle by low level transition；Second blank time system is that second control signal is turned by high levle
State be the time point of high levle at the time point of low level by low level transition to first control signal.
Preferably, starting to generate resonant operation when second switch conducting.
Preferably, the time of resonant operation is greater than the time of second switch conducting, and led less than or equal to second switch
The summation of logical time and the second blank time.
Preferably, the second blank time is the time of first switch zero voltage switching.
Compared with prior art, the invention has the benefit that
One, half-bridge resonance DC-DC converter can reduce switch element cost, reduce conduction losses and increase and imitate
Rate and reduction circuit volume；
Two, the operating method of half-bridge resonance DC-DC converter can reduce switch element cost, reduce conducting damage
It loses and increases efficiency and reduce circuit volume.
Detailed description of the invention
Detailed description will be given by the following detailed implementation and drawings by the present invention for ease of explanation,.
Fig. 1 is the circuit diagram of active clamper flyback power converter in the prior art；
Fig. 2 is the timing diagram of the control signal of the active clamper flyback power converter of Fig. 1；
Fig. 3 A is the circuit diagram of the first embodiment of half-bridge resonance DC-DC converter of the present invention；
Fig. 3 B: for the circuit diagram of the second embodiment of half-bridge resonance DC-DC converter of the present invention；
Fig. 4 is the timing diagram of the control signal of half-bridge resonance DC-DC converter of the present invention；
Fig. 5 is the waveform diagram of the resonance zero voltage switching of half-bridge resonance DC-DC converter of the present invention；
Fig. 6 is the flow chart of the operating method of half-bridge resonance DC-DC converter of the present invention.
In figure: 10- half-bridge resonance DC-DC converter；20- control unit；Vin- direct-current input power supplying；Vout- is straight
Flow out-put supply；Tr- isolating transformer；Lm- magnetizing inductance；Lr- resonant inductance；Cr- resonant capacitance；Q1- first switch；Q2-
Second switch；Do- output diode；Co- output capacitance；S1- first control signal；S2- second control signal；D1- parasitism two
Pole pipe；C1- parasitic capacitance；I1- first switch draws source current；I2- second switch draws source current；V1- first switch draws source
Pole tension；Qm- main switch；Qa- auxiliary switch；Sm- main control signal；Sa- auxiliary control signal；T1~t7- time point；dt1-
First blank time；The second blank time of dt2-.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, below by shown in the accompanying drawings specific
Embodiment describes the present invention.However, it is understood that these descriptions are merely illustrative, and it is not intended to limit the scope of the invention.
It is of the invention general to avoid unnecessarily obscuring in addition, in the following description, descriptions of well-known structures and technologies are omitted
It reads.
Here, it should also be noted that, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings only
Show with closely related structure and/or processing step according to the solution of the present invention, and be omitted little with relationship of the present invention
Other details.
Referring to is circuit for the first embodiment of half-bridge resonance DC-DC converter of the present invention shown in Fig. 3 A
Figure.Half-bridge resonance DC-DC converter 10 receives direct-current input power supplying Vin, and converts direct-current input power supplying Vin as direct current
Out-put supply Vout；Half-bridge resonance DC-DC converter 10 includes the resonant inductance Lr, humorous of isolating transformer Tr, input side
Vibration capacitor Cr, first switch Q1, second switch Q2, the output diode Do of outlet side, output capacitance Co and control unit 20.
Isolating transformer Tr has primary side and primary side, wherein the turn ratio of the coil of the coil and primary side of primary side
For n1:n2；In addition, primary side has magnetizing inductance Lm；Resonant inductance Lr couples the first of direct-current input power supplying Vin and primary side
It holds between (such as dotted end, be so not limited system)；Wherein resonant inductance Lr system is realized using the leakage inductance of transformer Tr.
First switch Q1 has first end, second end and control terminal, and wherein second end couples grounding point.In the present embodiment
In, first switch Q1 system is metal oxide semiconductcor field effect transistor (metal-oxide-semiconductor field-
Effect transistor, MOSFET), so it is not limited system.Therefore, control terminal is gate (gate), first end is drain
(drain) and second end is source electrode (source).
Second switch Q2 has first end, second end and control terminal, wherein the first of second end coupling first switch Q1
End, first end couple direct-current input power supplying Vin and resonant inductance Lr.In the present embodiment, second switch Q2 system is metal oxidation
Object semiconductcor field effect transistor is so not limited system, and therefore, control terminal is gate, first end is drain and second end is
Source electrode.Resonant capacitance Cr is coupled between the first end of first switch Q1 and the second end (such as non-dotted end) of primary side.
In the first embodiment, output diode Do couple primary side first end (such as non-dotted end, so not as
Limitation) between ungrounded output end, i.e. the first end of the anode tap of output diode Do coupling primary side, cathode terminal couples non-
It is grounded output end, is used with providing the rectification for the voltage that primary side exports.Output capacitance Co couples ungrounded output end and connects
It between ground output end, is used with providing the pressure stabilizing of DC output power Vout, wherein ground connection output end is the second end of primary side
(such as dotted end).Subsidiary one mentions, and ungrounded output end and ground connection output end system are to provide half-bridge resonance direct current to convert direct current
Two output ends of the output voltage of device.
Control unit 20 provides first control signal S1 and second control signal S2.First control signal S1 is opened through first
The control terminal (i.e. gate) for closing Q1 controls first switch Q1, and second control signal S2 penetrates control terminal (the i.e. lock of second switch Q2
Pole) control second switch Q2.
Referring to is circuit for the second embodiment of half-bridge resonance DC-DC converter of the present invention shown in Fig. 3 B
Figure.Second embodiment shown in Fig. 3 B is two pole of output of outlet side with the most important difference of first embodiment shown in Fig. 3 A
The link position of pipe Do and output capacitance Co.In a second embodiment, output diode Do couple primary side second end (such as
Dotted end is so not limited system) and be grounded between output end, i.e. the second of the cathode terminal coupling primary side of output diode Do
End, anode tap coupling ground connection output end, is used with providing the rectification for the voltage that primary side exports.Output capacitance Co coupling is non-to be connect
Between ground output end and ground connection output end, it is used with providing the pressure stabilizing of DC output power Vout, wherein ungrounded output end is
The first end (such as non-dotted end) of primary side.It is all identical as Fig. 3 A as other circuit architectures, reference can be made to Fig. 3 A respective description,
It will not be repeated here.
It is shown in Figure 4, it is for the timing diagram of the control signal of half-bridge resonance DC-DC converter of the present invention.
It is illustrated below for first control signal S1 and the control sequential of second control signal S2.As shown in figure 4, the first control
(turned-on period) is the section time point t3~time point t4 during the conducting of signal S1 control first switch Q1, and
(turned-off period) is the section time point t4~time point t7 during cut-off.Second control signal S2 control second
It is the section time point t1~time point t2 or the section time point t5~time point t6 during the conducting of switch Q2, and the off period
Between be the section time point t2~time point t5.Wherein, have first between first control signal S1 and second control signal S2
Blank time (dead time) dt1 is first control signal S1 by time point that high levle transition is low level (to it is corresponding when
Between point t4) to second control signal S2 by time point (corresponding time point t5) that low level transition is high levle.Similarly, second
Controlling has the second blank time dt2 between signal S2 and first control signal S1, be second control signal S2 by high levle
Transition be the time of high levle at the time point (corresponding time point t6) of low level by low level transition to first control signal S1
Point (corresponding time point t7).Wherein above-mentioned blank time is also referred to as dead time, blind area time ... etc., is those skilled in the art
Well known to member.
Cooperate circuit architecture shown in Fig. 3 A or Fig. 3 B, the first blank time dt1 system is designed as being greater than the second blank time
dt2.Preferably, the first blank time dt1 may be designed as 10 times or more of the second blank time dt2, or at least 5 times or more.Cause
This, is compared to Fig. 1 and the relevant technologies shown in Fig. 2, first control signal S1 proposed by the invention and second control signal S2
It is not limited to the characteristic of level complementation, and is not limited to the first blank time dt1 spy equal with the second blank time dt2
Property.
The switch element of half-bridge resonance DC-DC converter of the present invention, which has, for convenience of description bears the excellent of low-voltage
Gesture will illustrate by taking voltage value as an example below.Assuming that direct-current input power supplying Vin is 400 volts.Referring to Fig. 3 A or Fig. 3 B, when
Two control signal S2 control second switch Q2 conductings, and when first control signal S1 control first switch Q1 shutdown, second switch
The voltage that Q2 is born is zero, and the voltage that is born of first switch Q1 is just the voltage value (i.e. 400 of direct-current input power supplying Vin
Volt).The energy of abrupt voltage wave caused by leakage inductance as transformer Tr can be absorbed completely through resonant capacitance Cr.
When second control signal S2 control second switch Q2 shutdown, and first control signal S1 control first switch Q1 is connected
When, the voltage that first switch Q1 is born is zero, and the voltage that is born of second switch Q2 is just the electricity of direct-current input power supplying Vin
Pressure value (i.e. 400 volts).
Compared to the active clamper flyback power converter (as shown in Figure 1) of the relevant technologies, first switch Q1 is held
The voltage value (when first switch Q1 shutdown, second switch Q2 conducting) and second that the voltage received is direct-current input power supplying Vin
The voltage value (when second switch Q2 shutdown, first switch Q1 conducting) that the voltage that switch Q2 is born is input power Vin, all
Less than the voltage that the main switch Qm of the relevant technologies is born, therefore the switch of half-bridge resonance DC-DC converter of the present invention is first
Part has the advantage for bearing low-voltage, therefore the first switch Q1 and second switch Q2 of lower pressure resistance (drop specification), example can be selected
Such as 450~500 volts of pressure resistances, switch element cost can be not only reduced, also due to the conducting of first switch Q1 and second switch Q2
Resistance (RDS (on)) is smaller, so that conduction losses (conduction loss) reduce, and increases efficiency.
It is shown in Figure 5, it is for the resonance zero voltage switching of half-bridge resonance DC-DC converter of the present invention
Waveform diagram.In time point t5, second control signal S2 controls second switch Q2 conducting, and first switch Q1 is shutdown shape
State.At this point, flowing through first switch Q1 to draw source current i1 is zero, and flows through second switch Q2 and draw source current i2 and then gradually increase
Greatly, and half-bridge resonance DC-DC converter initially enters resonant operation.
In time point t6, second switch Q2 shutdown, and first switch Q1 is still off state, that is, enters the second blank
Time dt2.It is reduced to zero at this point, flowing through second switch Q2 and drawing source current i2, and is originally used for zero first switch Q1 and draws source electrode
Electric current i1 then due to the parasitic diode D1 of first switch Q1 along local derviation it is through-flow through forward current and moment become negative value electric current, i.e.,
Forward current and first switch Q1 draw source current i1 flow direction on the contrary, wherein parasitic diode D1 has the function of afterflow, therefore
It is also known as freewheeling diode or flywheel diode (freewheeling diode).Furthermore since parasitic diode D1 is along partially
Conducting, therefore it is zero that first switch Q1, which draws source voltage v1,.Whereby, in the second blank time dt2, since first switch Q1 draws source
Pole tension v1 is zero, therefore first control signal S1 controls first switch Q1 conducting when time point t7, is cut with completing no-voltage
It changes, reduces the switch cost (switching loss) of switch whereby.In addition, by the turn-on time of second switch Q2, cooperation
Second blank time dt2, so that being drawn before source current i1 (i.e. resonance current) is zero by negative value increase (such as in first switch Q1
Shown in Fig. 5 between time point t6 and time point t7, the parasitic capacitance C1 of first switch Q1 can be made to discharge complete.
It is shown in Figure 6, it is for the flow chart of the operating method of half-bridge resonance DC-DC converter of the present invention.
The operating method of half-bridge resonance DC-DC converter 10 is to convert direct-current input power supplying Vin as DC output power
Vout.Wherein the circuit architecture of half-bridge resonance DC-DC converter 10 takes off explanation before can be found in, and details are not described herein.Operation
Method includes the steps that.Control unit 20 provides first control signal S1 control first switch Q1 and provides the second control letter
Number S2 control second switch Q2 (S10).Then, control unit 20 provide the first blank time dt1 in first control signal S1 with
S2 (S20) between second control signal.It by high levle transition is low that wherein the first blank time dt1 system, which is first control signal S1,
The time point of level is the time point of high levle by low level transition to second control signal S2.
Furthermore control unit 20 provide the second blank time dt2 in second control signal S2 and first control signal S1 it
Between (S30).Wherein the second blank time dt2 system is second control signal S2 by time point that high levle transition is low level to
One control signal S1 is the time point of high levle by low level transition.Wherein the first blank time dt1 is greater than the second blank time
dt2.Preferably, the first blank time dt1 may be designed as 10 times or more of the second blank time dt2, or at least 5 times or more.
Whereby, through the control strategy of first control signal S1 and second control signal S2 to shown in Fig. 3 A or Fig. 3 B half
Bridge resonance DC controls direct current transducer, to realize the zero voltage switching of resonant operation and switch element.
In conclusion the present invention has following features and advantages:
1, the switch element that lower pressure resistance (drop specification) can be selected, can not only reduce switch element cost, also may make and lead
Logical loss reduces, and increases efficiency.
2, the resonant capacitance compared with low-capacitance can be selected, to reduce circuit volume.
3, increase efficiency through the zero voltage switching of switch element to reduce the switch cost of switch element.
The above, the detailed description and schema of preferred embodiment only of the present invention, only the feature of the present invention is not
Be confined to this, be not intended to limit the invention, all ranges of the present invention should be subject to following claims, it is all together in
The embodiment of the spirit of scope of the present invention patent variation similar with its, should all be contained in the scope of the present invention, any ripe
A those skilled in the art is known in the field of the present invention, can think easily and changes or modifications can all cover patent model in following this case
It encloses.
Claims (14)
1. half-bridge resonance DC-DC converter, to convert direct-current input power supplying as DC output power；It is characterized by:
Half-bridge resonance DC-DC converter include isolating transformer, resonant inductance, first switch, second switch, resonant capacitance with
And control unit；Isolating transformer has primary side and primary side；Resonant inductance couples the of direct-current input power supplying and primary side
Between one end；First switch has first end, second end and control terminal, and wherein second end couples grounding point；Second switch tool
There are first end, second end and control terminal, wherein the first end of second end coupling first switch, first end couples direct current input electricity
Source and resonant inductance；Resonant capacitance couples between the first end of first switch and the second end of primary side；Control unit provides the
One control signal and second control signal, wherein first control signal controls first switch through the control terminal of first switch, the
Two control signals control second switch through the control terminal of second switch.
2. half-bridge resonance DC-DC converter according to claim 1, it is characterised in that: first control signal and the
There is the first blank time between two control signals, when there is the second blank between second control signal and first control signal
Between；Wherein the second blank time is less than the first blank time.
3. half-bridge resonance DC-DC converter according to claim 2, it is characterised in that: the first blank time system is
First control signal is high levle by low level transition to second control signal by time point that high levle transition is low level
Time point；Second blank time system is second control signal by time point that high levle transition is low level to first control signal
It is the time point of high levle by low level transition.
4. half-bridge resonance DC-DC converter according to claim 1, it is characterised in that: when second switch is connected,
Start to generate resonant operation.
5. half-bridge resonance DC-DC converter according to claim 4, it is characterised in that: the time of resonant operation is big
In the time of second switch conducting, and it is less than or equal to the time of second switch conducting and the summation of the second blank time.
6. half-bridge resonance DC-DC converter according to claim 3, it is characterised in that: the second blank time is the
The time of one switch zero voltage switching.
7. half-bridge resonance DC-DC converter according to claim 1, it is characterised in that: half-bridge resonance direct current is to straight
Stream transformer further include: output diode couples between the first end of primary side and ungrounded output end；And output capacitance, coupling
It connects between ungrounded output end and ground connection output end, wherein ground connection output end is the second end of primary side.
8. half-bridge resonance DC-DC converter according to claim 1, it is characterised in that: half-bridge resonance direct current is to straight
Stream transformer further include: output diode couples between the second end of primary side and ground connection output end；And output capacitance, coupling
Between ungrounded output end and ground connection output end, wherein ungrounded output end is the first end of primary side.
9. the operating method of half-bridge resonance DC-DC converter, to convert direct-current input power supplying as DC output power,
It is characterized by: half-bridge resonance DC-DC converter includes first switch, second switch and control unit；Operating method
It include: that control unit provides first control signal control first switch and provides second control signal control second switch；Control
Unit processed provides the first blank time between first control signal and second control signal；And control unit provides the second blank
Time is between second control signal and first control signal, wherein the second blank time is less than the first blank time.
10. the operating method of half-bridge resonance DC-DC converter according to claim 9, it is characterised in that: half-bridge
Resonance DC further includes direct current transducer:
Isolating transformer has primary side and primary side；
Resonant inductance couples between direct-current input power supplying and the first end of primary side；
First switch has first end, second end and control terminal, and wherein second end couples grounding point；
Second switch has first end, second end and control terminal, wherein the first end of second end coupling first switch, and first
End coupling direct-current input power supplying and resonant inductance；
Resonant capacitance couples between the first end of first switch and the second end of primary side；
And control unit, first control signal is provided through the control terminal control first switch of first switch, and the second control is provided
Signal controls second switch through the control terminal of second switch.
11. the operating method of half-bridge resonance DC-DC converter according to claim 9, it is characterised in that: first
Blank time system is that first control signal is turned to second control signal by low level by the time point that high levle transition is low level
State is the time point of high levle；Second blank time system is second control signal by time point that high levle transition is low level extremely
First control signal is the time point of high levle by low level transition.
12. the operating method of half-bridge resonance DC-DC converter according to claim 9, it is characterised in that: when
When two switch conductions, start to generate resonant operation.
13. the operating method of half-bridge resonance DC-DC converter according to claim 12, it is characterised in that: resonance
The time of operation is greater than the time of second switch conducting, and is less than or equal to time and the second blank time of second switch conducting
Summation.
14. the operating method of half-bridge resonance DC-DC converter according to claim 12, it is characterised in that: second
Blank time is the time of first switch zero voltage switching.
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| CN201811183707.5A CN109245543A (en) | 2018-10-11 | 2018-10-11 | Half-bridge resonance DC-DC converter and its operating method |
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| CN201811183707.5A CN109245543A (en) | 2018-10-11 | 2018-10-11 | Half-bridge resonance DC-DC converter and its operating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112217398A (en) * | 2020-10-23 | 2021-01-12 | 亚瑞源科技（深圳）有限公司 | Power conversion device with damping control, module and operation method thereof |
| CN113937991A (en) * | 2020-07-13 | 2022-01-14 | 光宝电子(广州)有限公司 | Converter with half-bridge circuit |
| TWI760788B (en) * | 2020-07-13 | 2022-04-11 | 大陸商光寶電子（廣州）有限公司 | Converter with half-bridge circuit |
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| CN103891120A (en) * | 2011-10-21 | 2014-06-25 | 株式会社村田制作所 | Switching power-supply device |
| US20150333634A1 (en) * | 2012-12-28 | 2015-11-19 | Panasonic Intellectual Property Management Co., Ltd. | Dc-to-dc converter |
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| CN113937991A (en) * | 2020-07-13 | 2022-01-14 | 光宝电子(广州)有限公司 | Converter with half-bridge circuit |
| TWI760788B (en) * | 2020-07-13 | 2022-04-11 | 大陸商光寶電子（廣州）有限公司 | Converter with half-bridge circuit |
| CN113937991B (en) * | 2020-07-13 | 2023-07-18 | 光宝电子(广州)有限公司 | Converter with half-bridge circuit |
| CN112217398A (en) * | 2020-10-23 | 2021-01-12 | 亚瑞源科技（深圳）有限公司 | Power conversion device with damping control, module and operation method thereof |
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Application publication date: 20190118 |