CN101399502B - Forward converter having self-driving synchronous rectifier - Google Patents
Forward converter having self-driving synchronous rectifier Download PDFInfo
- Publication number
- CN101399502B CN101399502B CN2007101811140A CN200710181114A CN101399502B CN 101399502 B CN101399502 B CN 101399502B CN 2007101811140 A CN2007101811140 A CN 2007101811140A CN 200710181114 A CN200710181114 A CN 200710181114A CN 101399502 B CN101399502 B CN 101399502B
- Authority
- CN
- China
- Prior art keywords
- subordinate
- rectifier
- output
- constraint
- voltage
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
A forward converter with a self-drive type synchronous rectifier uses a secondary drive coil and a secondary drive circuit so as to drive the synchronous rectifier in a secondary power circuit. The secondary drive circuit comprises a potential shifter, a signal distributor, voltage across the secondary drive coil by a potential displacement, and distributes a voltage signal so as to control a forward unrestricted rectifier to reduce breakover loss. In particular, the unrestrained rectifier still can be opened so as to further reduce breakover loss during the delay period.
Description
Technical field
The present invention discloses a kind of forward converter with self-driven synchronous rectifier.
Background technology
Forward converter (forward converter) is through being usually used in converting a High Level DC Voltage source to many group low dc voltages source, wherein mainly output (master output) with a loop circuit pulse wave width modulation (closed-loop pulse width modulation) voltage stabilizing (regulated) subordinate output (slaveoutputs) with level post regulator (secondary side post regulator, SSPR) voltage stabilizing.
Main output circuit as shown in Figure 1.Secondary power circuit is by secondary power lines circle T
s, rectifier M forward
f, do not have constraint (freewheeling) rectifier M
w, energy storage inductor L
1With filter capacitor C
1Form.In this circuit, error amplifying circuit 3 sampling output voltage V
1And with a reference voltage comparison to produce an error voltage that is exaggerated; Control circuit 2 converts the error voltage that is exaggerated to the pulse wave width modulation signal; Drive circuit 1 becomes forward rectifier M with the pulse wave width modulation conversion of signals
fWith nothing constraint rectifier M
wDrive signal.As rectifier M forward
fOpen and do not have a constraint rectifier M
wWhen closing, energy storage inductor L
1Voltage V
L1For on the occasion of, energy storage inductor L
1Via rectifier M forward
f, secondary power lines circle T
sWith filter capacitor C
1Store electrical energy.As rectifier M forward
fClose and do not have a constraint rectifier M
wDuring unlatching, energy storage inductor L
1Voltage V
L1Be negative value, energy storage inductor L
1By there not being constraint rectifier M
wWith filter capacitor C
1Disengage electric energy.This kind circuit structure (be also referred to as him and drive the formula synchronous rectifier) is comparatively complicated and expensive.
The subordinate output circuit as shown in Figure 2.Secondary power circuit is by secondary power lines circle T
S2, secondary back adjuster S
1, diode rectifier D forward
f, do not have a constraint diode rectifier D
w, energy storage inductor L
2With filter capacitor C
2Form; Wherein, secondary back adjuster S
1Be used to cover (blank) across secondary power lines circle T
S2The leading edge of voltage waveform (leading edge) makes energy storage inductor L
2Input voltage waveform (connect D
f, D
wWith L
2Node over the ground) mean value be output voltage V
2
The capture-effect of secondary back adjuster S1 as shown in Figure 3, can be led the energy storage inductor L of output
1Energy storage inductor L with subordinate output
2The voltage waveform explanation.In open period 0＜t＜T
On, energy storage inductor L
1Voltage waveform V
L1Not crested and being on the occasion of (energy storage).0＜t during covering＜T
Blank, adjuster S after the dimension level
1Close forward diode rectifier D so no current is flowed through
fEnergy storage inductor L
2Continuous current force and do not have constraint diode rectifier D
wConducting makes its voltage waveform V
L2Be negative value (releasing energy).T during non-covering
Blank＜t＜T
On, adjuster S after the dimension level
1Open, forward diode rectifier D
fBeginning conducting electric current.The continuous current of energy storage inductor L2 is not from there being constraint diode rectifier D
wThe change of current (commutate) is diode rectifier D extremely forward
fMake its voltage waveform V
L2For on the occasion of (energy storage).
Secondary back adjuster S
1Can be a magnetic amplifier (magnetic amplifier, MA) or a suspension control switch (controlled switch).Make secondary back adjuster S in fact with magnetic amplifier
1The time, need to connect a reset circuit (reset circuit).If make secondary back adjuster S in fact with suspension control switch
1, need to connect a driver ic (ic driver).Here reset circuit and driver ic are referred to as on-off controller 4.
Rectifier that it should be noted that this slave circuit is with the rectifier of diode as this power circuit, so cause bigger rectifier conducting loss.
Summary of the invention
Therefore in order to address the above problem, to the purpose of this invention is to provide a kind of cheap effectively (cost-effective) and have the forward converter of self-driven synchronous rectifier to drive the synchronous rectifier in main and subordinate loop simultaneously.
A kind of forward converter with self-driven synchronous rectifier is provided according to an aspect of the present invention, wherein, main output circuit be utilize the driving loop of the secondary drive coil be connected in a transformer be connected in driving the secondary power lines circle power circuit forward rectifier and do not have the constraint rectifier.Drive circuit also comprises a potential displacement device, and it makes and to produce a potential displacement amount across voltage of secondary drive coil, exports with as voltage signal again.After signal distributor receives voltage signal, voltage signal can be distributed to rectifier forward and not have the control end of constraint rectifier.
A kind of forward converter with self-driven synchronous rectifier is provided according to a further aspect of the invention, wherein, the subordinate output circuit comprises secondary back adjuster, subordinate power circuit, subordinate secondary drive coil and the one drive circuit that is serially connected with subordinate secondary power lines circle.The subordinate power circuit is in order to provide the subordinate output voltage, drive circuit is connected in the subordinate secondary drive coil, in order to open or to close the forward rectifier of subordinate power circuit, and the control end of the nothing of the subordinate power circuit constraint rectifier voltage signal of nothing constraint rectifier of the power circuit that is subjected to main output that continues, and open simultaneously or close.Secondary back adjuster is a magnetic amplifier or a suspension control switch in order to covering the voltage waveform leading edge across the secondary power lines circle, and then adjusts its output voltage.
Description of drawings
Fig. 1 is the main output circuit schematic diagram of existing forward converter.
Fig. 2 is the subordinate output circuit schematic diagram of existing forward converter.
Fig. 3 is the input terminal voltage oscillogram of the energy storage inductor of the main output circuit of existing forward converter and subordinate output circuit.
Fig. 4 is the main output circuit schematic diagram of the forward converter with self-driving type rectifier of one embodiment of the invention.
Fig. 5 is the main output circuit figure of the forward converter with self-driving type rectifier of one embodiment of the invention.
Fig. 6 is embodiment shown in Figure 5, in one-period, the forward transistorized grid voltage of secondary drive coil, main output circuit and do not have the constraint transistorized grid voltage oscillogram.
Fig. 7 is the main output circuit schematic diagram of the forward converter with self-driving type rectifier of one embodiment of the invention.
Fig. 8 is the main output circuit figure of the forward converter with self-driving type rectifier of one embodiment of the invention.
Fig. 9 is embodiment shown in Figure 8, in one-period, the forward transistorized grid voltage of first secondary drive coil, main output circuit and do not have the constraint transistorized grid voltage oscillogram.
Figure 10 is the subordinate output circuit schematic diagram of the self-driving type forward converter of one embodiment of the invention.
Figure 11,12 is the subordinate output circuit figure of the self-driving type forward converter of different embodiments of the invention.
Figure 13 is the embodiment of subordinate output circuit shown in Figure 11, the embodiment of the main output shown in Figure 5 of arranging in pairs or groups, and in one-period, the forward transistorized grid voltage of secondary drive coil, subordinate output and do not have the transistorized grid voltage oscillogram of constraint.
Figure 14 is the embodiment of subordinate output circuit shown in Figure 11, the embodiment of the main output shown in Figure 8 of arranging in pairs or groups, and in one-period, the forward transistorized grid voltage of secondary drive coil, subordinate output circuit and do not have the transistorized grid voltage oscillogram of constraint.
Embodiment
See also the configuration schematic diagram of Fig. 4 for the forward converter master output with self-driven synchronous rectifier of one embodiment of the invention.As shown in the figure, a transformer comprises primary coil (primary winding) T
1, secondary power lines circle (secondary power winding) T
2And secondary drive coil (secondary drivingwinding) T
3, primary coil T wherein
1In order to connect external power source, so that input voltage Vi to be provided, the stain end is as first end of coil among the figure, and stain is represented same polarity, and the other end is coil second end.
Secondary power lines circle T
2Connect main power circuit 21 and have voltage output end (high-pressure side) and earth terminal (low-pressure end), in order to the voltage V that drives external load circuit (load) (not showing on the figure) to be provided
1, and between voltage output end and earth terminal cross-over connection one filter capacitor C
3In order to voltage stabilizing, secondary power lines circle T
2First end (stain end) be connected in series energy storage inductor L with voltage output end
3
Secondly, secondary drive coil T
3Two ends connect first output and second output of signal distributor 22, the common connection end of signal distributor 22 is connected in the tie point Z of second end of two rectifiers 211,212
M, first output and second output are connected does not respectively have the constraint rectifier 212 and the control end of rectifier 211 forward.
As secondary drive coil T
3The magnitude of voltage (voltage signal) of first end (stain end) be timing, first output of Continuity signal distributor 22 and common link conducting, and voltage signal is distributed to the control end of the forward rectifier 211 that is connected with second output of signal distributor 22, as secondary drive coil T
3The magnitude of voltage of first end (stain end) when negative, second output of Continuity signal distributor 22 and common link conducting, and voltage signal is distributed to the control end that the nothing that is connected with first output of signal distributor 22 retrains rectifier 212.
Fig. 5 makes circuit diagram for the reality of the main output of the forward converter with self-driven synchronous rectifier of Fig. 4 embodiment.As shown in the figure, with two-transistor M
1, M
2Make in fact forward rectifier 211 and do not have constraint rectifier 212, be called forward transistor M
1And nothing constraint transistor M
2In present embodiment, transistor M
1, M
2Drain electrode as first end of rectifier forward, then as second end, grid is as control end for source electrode.
Moreover signal distributor 22 comprises the diode D of two back-to-back connections
1, D
2, promptly the positive pole of two diodes is connected, and its tie point is as common connection end, diode D
1, D
2Negative pole respectively as first output and second output, connect not have constraint transistor M respectively
2Reach forward transistor M
1Grid (control end).
Fig. 6 illustrated in one-period, the secondary drive coil T of embodiment shown in Figure 5
3First end, transistor M forward
1Grid with do not have constraint transistor M
2Voltage sequential (voltage waveform) figure of grid.For convenience of explanation, in the present embodiment, make secondary drive coil T
3The magnitude of voltage of cross-pressure is V between two ends
s
T during the replacement
On≤ t≤T
On+ T
Reset, secondary drive coil T
3The voltage of first end be-V
s(negative value), diode D
1Be subjected to reverse biased and close diode D
2Be subjected to forward bias voltage drop and open.Signal distributor 22 is with voltage signal (voltage V
s) distribute to and do not have constraint transistor M
2Grid (control end) and open transistor M forward
1Grid (control end) be subjected to voltage 0 and close.During this, energy storage inductor L
3By there not being constraint transistor M
2And filter capacitor C
3Discharge electric energy.
Timing period T
On+ T
Reset≤ t≤T
s, secondary drive coil T
3Two end spaies to press be 0, diode D
1, D
2All close.Transistor M forward
1With nothing constraint transistor M
2Grid be subjected to voltage 0 and all close.During this period, energy storage inductor L
3Continuous current force and do not have constraint transistor M
2The body diode conducting and by filter capacitor C
3Discharge electric energy.
It should be noted that energy storage inductor L
3Continuous current in timing period T
On+ T
Reset≤ t≤T
sIn flow through and do not have constraint transistor M
2Body diode.This conducting loss can be further reduced by a potential displacement device.Embodiment as shown in Figure 7, it has the configuration circuit schematic diagram of main output of the forward converter with self-driven synchronous rectifier of the embodiment of potential displacement device 23 for the present invention.Relatively present embodiment and embodiment shown in Figure 4, it does not exist together and is that promptly present embodiment sets up a potential displacement device 23 and lose with the conducting in the further reduction timing period.
As shown in the figure, potential displacement device 23 has first input end, second input, first output and second output, and second output of present embodiment and second input are same end.Secondary drive coil T
3First end and second end first input end and second input that are connected to potential displacement device 23, first output and second output of first output of potential displacement device 23 and second output cross-over connection drive signal distributor again 22.
Two outputs that are noted that potential displacement device 23 especially are with the potential displacement one electric voltage displacement amount V of two inputs
rFor example in the present embodiment, secondary drive coil T
3The voltage signal of being exported is V
s, the potential displacement amount V of potential displacement device 23
rSo, signal distributor 22 distribute voltage signal to be respectively the voltage V of first output of potential displacement device 23
s-V
rAnd the voltage-V of second output
s-V
r
Fig. 8 makes circuit diagram for the reality of the main output of the forward converter with self-driven synchronous rectifier of Fig. 7 embodiment.As shown in the figure, potential displacement device 23 comprises the capacitor C of serial connection
4, diode D
4And Zener diode ZD
4Capacitor C
4An end as first input end, an end connects diode D
4Positive pole, tie point is as first output, diode D
4Negative pole connect Zener diode ZD
4Negative pole, Zener diode ZD
4Anodal simultaneously as second input and second output.The principle of potential displacement device 23 runnings of present embodiment below is described.
In open period 0＜t＜T
OnIn, the diode D of potential displacement device 23
4Conducting, secondary drive coil T
3To capacitor C
4Charging, wherein capacitor C
4Capacitance in a switching cycle (switching period), can be maintained approximately a fixing cross-pressure V
C4, and diode D
4Forward drop V
fMinimum, for simplicity, forward drop V in the present embodiment
fBe assumed to be 0.Therefore, capacitor C
4Cross-pressure V
C4Be the potential displacement amount V that potential displacement device 23 is provided
r, it can be represented as V
C4=V
s-V
z-V
f=V
s-V
z, V wherein
sBe secondary drive coil T
3Positive driving voltage, V
zBe Zener diode ZD
4Breakdown voltage, and diode D
4Forward drop V
fBe assumed to be 0.
Fig. 9 illustrated in one-period, secondary drive coil T embodiment illustrated in fig. 8
3First end, transistor M forward
1Grid with do not have constraint transistor M
2The sequential chart of voltage of grid.
T during the replacement
On≤ t≤T
On+ T
Reset, also the difference with Fig. 6 embodiment is not have constraint transistor M
2The voltage signal that grid distributed be 2V
s-V
z=V
s+ (V
s-V
z).
Timing period T
On+ T
Reset≤ t≤T
s, be not have constraint transistor M with the difference of Fig. 6 embodiment
2Grid still be assigned with voltage signal V
s-V
z, therefore, during this period in, do not have constraint transistor M
2Still be unlocked energy storage inductor L
3By there not being constraint transistor M
2And filter capacitor C
3Discharge electric energy, further reduce the conducting loss.
Please refer to the subordinate output circuit schematic diagram that Figure 10 illustrates one embodiment of the invention.As shown in the figure, secondary power lines circle T
14The secondary back of first end (stain end) serial connection adjuster S
2And the subordinate power circuit, the output of subordinate power circuit comprises attached voltage output end and earth terminal, and between attached voltage output end and earth terminal cross-over connection subordinate filter capacitor C
5, wherein attached voltage output end provides the subordinate output voltage V
2Secondary drive coil T
13 Connect drive circuit 32, in order to drive the subordinate power circuit.
The subordinate power circuit comprises forward rectifier 311, nothing constraint rectifier 312 and energy storage inductor L
5Forward second end of rectifier 311 connects secondary back adjuster S
2, forward first end of rectifier 311 is connected to tie point Z with first end that does not have constraint rectifier 312
s, tie point Z
sBe connected in series energy storage inductor L between the attached voltage output end
5Second end that does not have constraint rectifier 312 connects secondary power lines circle T
14Second end and connect earth terminal, the control end that does not have constraint rectifier 312 connects the control end of the nothing constraint rectifier of main output circuit, thereby continues and be subjected to its voltage signal.Wherein, secondary back adjuster S
2Be connected to an on-off controller 33.
Figure 11 shows that the real circuit diagram of doing of Figure 10 embodiment.Adopt transistor M
7, M
8Make the forward rectifier 311 of subordinate output circuit in fact and do not have constraint rectifier 312, be called forward transistor M
7And nothing constraint transistor M
8, wherein transistor drain, source electrode and grid are respectively as first end, second end and the control end of rectifier.
As secondary drive coil T
13First terminal voltage be V
S2(on the occasion of) time, transistor Q
1Conducting and transistor Q
2Close feasible forward transistor M
7Conducting.As secondary drive coil T
13First terminal voltage be-V
S2(negative value) or 0 o'clock, transistor Q
1Close and transistor Q
2The feasible forward transistor M of conducting
7Close.Cause is transistor M forward
7Grid-source voltage waveform non-negative (nonnegative), this kind drive pattern is called one pole drive pattern (unipolardriving mode).
Figure 12 shows that another real circuit diagram of doing of Figure 10 embodiment, be to adopt bipolar driving pattern (bipolar driving mode) with the difference of embodiment shown in Figure 11.As shown in the figure, drive circuit 32 only comprises two resistance R that connect
1, R
2, be connected to secondary drive coil T more respectively
13First end and second end.Resistance R
1, R
2Tie point be connected to forward transistor M
7Grid, resistance R
2Be connected in forward transistor M
7Grid and source electrode between.
As secondary drive coil T
13First terminal voltage be V
S2(on the occasion of) time, resistance R
1, R
2Dividing potential drop for just, transistor M forward
7Thereby open.As secondary drive coil T
13First terminal voltage be-V
S2(negative value) or 0 o'clock, R
1, R
2Dividing potential drop be non-just (nonpositive), forward transistor M
7Close.
Adjuster S after secondary
2During for suspension control switch, the forward transistor M of subordinate power circuit
7Grid can connect the forward transistorized grid of main output circuit and continue and be subjected to its voltage signal, and omit drive circuit 32, further simplify circuit.Further, can be with transistor M forward
7Move on to secondary power lines circle T
14Second end and with do not have constraint transistor M
8Adopt the configuration of common source.That is to say, the forward rectifier of subordinate power circuit and second end that does not have the constraint rectifier are not connected to earth terminal, the end (negative terminal) that the forward rectifier of subordinate power circuit and first end that does not have the constraint rectifier then are connected subordinate secondary power lines circle T14 respectively with secondary after adjuster S
2An end, the other end of secondary back adjuster S2 connects the other end (anode) of subordinate secondary power lines circle T14, the forward rectifier of subordinate power circuit and two control ends that do not have the constraint rectifier continue the respectively forward rectifier and the voltage signal that does not have constraint rectifier control end of the power circuit that is subjected to main output circuit, remaining circuit is embodiment as described above.
Figure 13 is in one-period, and embodiment shown in Figure 11 is the secondary drive coil T of subordinate output
13First end, transistor M forward
7With nothing constraint transistor M
8Grid (control end) voltage sequential (voltage waveform) figure, the main output circuit of present embodiment is embodiment shown in Figure 5.
T during the replacement
On≤ t≤T
On+ T
Reset, secondary drive coil T
13First terminal voltage be-V
S2(negative value).Transistor M forward
7Lock source voltage be that 0 (unipolarity driving) or negative (bipolarity driving) are closed.There is not constraint transistor M
8Grid continue and be subjected to nothing constraint transistor M in the main output circuit
2Grid voltage V
sAnd open.Energy storage inductor L
5By there not being constraint transistor M
8And filter capacitor C
5Discharge electric energy.
Timing period T
On+ T
Reset≤ t≤T
s, secondary drive coil T
13Two end spaies to press be 0, transistor M forward
7Grid voltage be 0 to close.There is not constraint transistor M
8Grid continue and be subjected to nothing constraint transistor M in the main output circuit
2Grid voltage 0 and close.Energy storage inductor L
5By there not being constraint transistor M
8Body diode and filter capacitor C
5Discharge electric energy.
Figure 14 is in one-period, and embodiment shown in Figure 11 is the secondary drive coil T of subordinate output
13First end, transistor M forward
7With nothing constraint transistor M
8Grid (control end) voltage sequential (voltage waveform) figure, the main output circuit of present embodiment is embodiment shown in Figure 8.With timing period, there is not constraint transistor M during being to reset with the difference of embodiment shown in Figure 13
8Grid be that the nothing of accepting main output circuit retrains transistorized grid voltage, the magnitude of voltage of accepting is 2V during wherein resetting
s-V
z, and be V in timing period
s-V
zBe noted that because of in the timing period not have constraint transistor M especially
8Grid voltage on the occasion of opening, further reduce the conducting loss.
Be noted that especially, nothing in the foregoing description constraint transistor and forward transistor can be a N channel mos field-effect transistor, P channel mos field-effect transistor, N passage junction field effect transistor or P passage junction field effect transistor, the present invention also is not limited to above-mentioned.
Above-described embodiment only is for technological thought of the present invention and characteristics are described, its purpose makes person skilled in the art scholar can understand content of the present invention and is implementing according to this, when not limiting claim of the present invention with it, be that every equalization of doing according to disclosed spirit changes or modification, must be encompassed in the claim of the present invention.
Claims (9)
1. forward converter with self-driven synchronous rectifier comprises:
One transformer has a primary coil, a level drive coil and a level power line circle, and wherein this primary coil connects an external power source;
One main power circuit, comprise a rectifier forward, one does not have a constraint rectifier and an energy storage inductor, this secondary power lines circle that connects this transformer, wherein this main power circuit has a principal voltage output and an earth terminal, and cross-over connection one filter capacitor between this principal voltage output and this earth terminal, this nothing constraint rectifier with this forward first end of rectifier be connected first end and second end of this secondary power lines circle respectively, this nothing constraint rectifier and this forward second end of rectifier are connected in a tie point, this tie point connects earth terminal, be connected in series an energy storage inductor between first end of this secondary power lines circle and this voltage output end, wherein this rectifier or not have the constraint rectifier be a N channel mos field-effect transistor forward, one P channel mos field-effect transistor, one N passage connects surface field-effect transistor or a P passage connects surface field-effect transistor;
One signal distributor, comprise one first output, one second output and a common link, wherein this first output and this second output are connected forward control end of rectifier of this nothing constraint rectifier and this respectively, this common connection end is connected in this forward tie point of second end of rectifier and this nothing constraint rectifier, voltage difference by this first output and this second output, the circuit of decision this common connection end of conducting and this first output or this second output, and respectively a voltage signal is distributed to this forward rectifier control end of this nothing constraint rectifier maybe, wherein this signal distributor comprises one first diode and one second diode, the positive pole of this first diode and this second diode is connected to this common connection end, and the negative pole of this first diode and this second diode is respectively this first output and this second output; And
One potential displacement device, it comprises a first input end, one second input, one first output and one second output, wherein this first input end and this second input are connected first end and second end of this secondary drive coil respectively, this first output and this second output are connected first output and second output of this signal distributor respectively, make input voltage be exported again by displacement one phase-shifted amount, in order to this voltage signal to be provided, wherein this potential displacement device comprises an electric capacity, one diode and a Zener diode, wherein an end of this electric capacity is as this first input end, the other end of this electric capacity is connected with the positive pole of this diode, its tie point is as this first output, the negative pole of this diode connects the negative pole of this Zener diode, and the anodal while of this Zener diode is as this second input and this second output.
2. the forward converter with self-driven synchronous rectifier according to claim 1, it is characterized in that also comprising subordinate output, this subordinate output comprises a subordinate secondary power lines circle, adjuster after the level, one subordinate power circuit, wherein this subordinate power circuit comprises forward rectifier of a subordinate, one subordinate does not have the constraint rectifier, one subordinate energy storage inductor, one subordinate voltage output end and earth terminal, and cross-over connection one subordinate filter capacitor between this subordinate voltage output end and this earth terminal, this subordinate forward rectifier and this subordinate second end that do not have a constraint rectifier is connected in earth terminal, this subordinate forward first end of rectifier connects second end of this subordinate secondary power lines circle, this subordinate does not have the end that first end that retrains rectifier connects this secondary back adjuster, the other end of this secondary back adjuster is connected in first end of this second subprime electric power coil, and this secondary back adjuster connects an ON-OFF control circuit, one end of this subordinate energy storage inductor connects first end that this subordinate does not have the constraint rectifier, the other end of this subordinate energy storage inductor connects this subordinate voltage output end, this subordinate do not have constraint rectifier and this subordinate forward the control end of rectifier be connected this main power circuit respectively this forward rectifier and this nothing retrain the control end of rectifier, wherein this secondary back adjuster is a suspension control switch, and this ON-OFF control circuit is a driver ic, and this subordinate forward rectifier or do not have the constraint rectifier be a N channel mos field-effect transistor, one P channel mos field-effect transistor, one N passage connects surface field-effect transistor or a P passage connects surface field-effect transistor.
3. the forward converter with self-driven synchronous rectifier according to claim 1, it is characterized in that also comprising subordinate output, this subordinate output comprises a subordinate secondary power lines circle, adjuster after the level, one subordinate power circuit, wherein this subordinate power circuit comprises forward rectifier of a subordinate, one subordinate does not have the constraint rectifier, one subordinate energy storage inductor, one subordinate voltage output end and earth terminal, and cross-over connection one subordinate filter capacitor between this subordinate voltage output end and this earth terminal, this subordinate forward rectifier and this subordinate first end that do not have a constraint rectifier is connected in a tie point, this tie point is connected in series this subordinate energy storage inductor with this subordinate voltage output end, this subordinate forward rectifier does not have second end that second end that retrains rectifier is connected this secondary back adjuster and this subordinate secondary power lines circle respectively with this subordinate, the other end of this secondary back adjuster is connected in first end of this subordinate secondary power lines circle, this secondary back adjuster connects an ON-OFF control circuit, the control end that this subordinate does not have a constraint rectifier connects the control end of the nothing constraint rectifier of this main power circuit, wherein this subordinate rectifier or not have the constraint rectifier be a N channel mos field-effect transistor forward, one P channel mos field-effect transistor, one N passage connects surface field-effect transistor or a P passage connects surface field-effect transistor.
4. the forward converter with self-driven synchronous rectifier according to claim 3, it is characterized in that the forward control end of rectifier this control end of rectifier forward of connecting this main power circuit of this subordinate, and this secondary back adjuster is a suspension control switch, and this ON-OFF control circuit is a driver ic.
5. the forward converter with self-driven synchronous rectifier according to claim 3, it is characterized in that also comprising a subordinate secondary drive coil and an one drive circuit, this drive circuit is connected in the forward control end of rectifier of this subordinate secondary drive coil and this subordinate, and second end of this subordinate secondary drive coil is connected in forward second end of rectifier of this subordinate.
6. the forward converter with self-driven synchronous rectifier according to claim 5 it is characterized in that this secondary back adjuster is a suspension control switch, and this ON-OFF control circuit is a driver ic.
7. the forward converter with self-driven synchronous rectifier according to claim 5 it is characterized in that this secondary back adjuster is a magnetic amplifier, and this ON-OFF control circuit is a reset circuit.
8. the forward converter with self-driven synchronous rectifier according to claim 5, it is characterized in that this drive circuit comprises one first resistance and one second resistance, this first resistance and an end of this second resistance are connected first end and second end of this subordinate secondary drive coil respectively, and the other end of this first resistance and this second resistance is connected to the forward control end of rectifier of this subordinate.
9. the forward converter with self-driven synchronous rectifier according to claim 5, it is characterized in that this drive circuit comprises a diode, one npn bipolar transistor, one PNP bipolar transistor, one first resistance and one second resistance, the emitter of this npn bipolar transistor and this PNP bipolar transistor is connected to the forward control end of rectifier of this subordinate, the base stage of this npn bipolar transistor and this PNP bipolar transistor is connected to a tie point, one end of this first resistance and this second resistance is connected to this tie point, this first resistance and the other end of this second resistance are connected the collector electrode of this npn bipolar transistor and this PNP bipolar transistor respectively, it connects the negative pole of this diode and second end of this subordinate secondary drive coil respectively, and the positive pole of this diode connects first end of this subordinate secondary drive coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101811140A CN101399502B (en) | 2007-09-30 | 2007-09-30 | Forward converter having self-driving synchronous rectifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101811140A CN101399502B (en) | 2007-09-30 | 2007-09-30 | Forward converter having self-driving synchronous rectifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101399502A CN101399502A (en) | 2009-04-01 |
| CN101399502B true CN101399502B (en) | 2011-04-20 |
Family
ID=40517828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101811140A Expired - Fee Related CN101399502B (en) | 2007-09-30 | 2007-09-30 | Forward converter having self-driving synchronous rectifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101399502B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI627827B (en) * | 2016-04-18 | 2018-06-21 | Silergy Semiconductor Technology Hangzhou Ltd | Synchronous rectifier circuit and control method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237708A (en) * | 2010-04-23 | 2011-11-09 | 环旭电子股份有限公司 | Power supply system and method capable of preventing power supply interruption |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6104623A (en) * | 1999-10-21 | 2000-08-15 | Lucent Technologies, Inc. | Multiple output converter having secondary regulator using self-driven synchronous rectifiers |
| US6111769A (en) * | 1999-09-24 | 2000-08-29 | Ericsson, Inc. | External driving circuit for bridge type synchronous rectification |
| CN1339866A (en) * | 2000-08-17 | 2002-03-13 | 伊博电源（杭州）有限公司 | New self-driving circuit of synchronous rectifier tube |
| US6445597B1 (en) * | 2001-06-28 | 2002-09-03 | Tyco Electronics Logistics Ag | Local loop control system for a multiple output power converter |
-
2007
- 2007-09-30 CN CN2007101811140A patent/CN101399502B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111769A (en) * | 1999-09-24 | 2000-08-29 | Ericsson, Inc. | External driving circuit for bridge type synchronous rectification |
| US6104623A (en) * | 1999-10-21 | 2000-08-15 | Lucent Technologies, Inc. | Multiple output converter having secondary regulator using self-driven synchronous rectifiers |
| CN1339866A (en) * | 2000-08-17 | 2002-03-13 | 伊博电源（杭州）有限公司 | New self-driving circuit of synchronous rectifier tube |
| US6445597B1 (en) * | 2001-06-28 | 2002-09-03 | Tyco Electronics Logistics Ag | Local loop control system for a multiple output power converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI627827B (en) * | 2016-04-18 | 2018-06-21 | Silergy Semiconductor Technology Hangzhou Ltd | Synchronous rectifier circuit and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101399502A (en) | 2009-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10554128B2 (en) | Multi-level boost converter | |
| CN101796708B (en) | Boost and up-down switching regulator with synchronous freewheeling MOSFET | |
| CN102055357B (en) | Switch power supply controller circuit and switch power supply system | |
| US7009859B2 (en) | Dual input DC-DC power converter integrating high/low voltage sources | |
| US20040085048A1 (en) | DC-DC converter and controller for DC-DC converter | |
| CN107026572A (en) | The self-tuning adaptive dead-time control of continuous conduction mode and discontinuous conduction mode operation for inverse excitation type converter | |
| CN104038037B (en) | Auxiliary recharges | |
| CN102832810A (en) | Bootstrap voltage refresh control circuit, voltage conversion circuit and related control method | |
| CN101170279A (en) | Dual-bridge DC-DC converter and its control method | |
| JP2012503963A (en) | Separation circuit for DC / AC converter | |
| CN203859683U (en) | Synchronous rectification drive circuit | |
| US11329646B2 (en) | Switch device having a pulldown transistor and a voltage clamp | |
| US10389275B2 (en) | Converter with ZVS | |
| CN100502211C (en) | Self-driving circuit of synchronous rectifier tube of reverse excited transformer | |
| CN108063542A (en) | A kind of simple and reliable inexpensive silicon carbide power switching device driving circuit | |
| CN1228909C (en) | Synchronous rectifying driving circuit for DC converter | |
| CN101399502B (en) | Forward converter having self-driving synchronous rectifier | |
| US11973419B2 (en) | Inverter circuit and method, for example for use in power factor correction | |
| US10103634B2 (en) | Power converter device based on normally-on type switching devices | |
| CN101425759B (en) | Forward type converter having self-driving synchronous rectifier | |
| CN1316726C (en) | Self-driving circuit of antilaser converter synchronous rectifier | |
| CN206602454U (en) | Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification | |
| CN107196511A (en) | System and method for the power inverter with self-regulation power supply | |
| CN213661445U (en) | Current limiting circuit | |
| CN108599573B (en) | A kind of normal shock active clamp driving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20140930 |
|
| EXPY | Termination of patent right or utility model |